Petrochemical Monitoring Splicing Screen Scheme CCR Non-Explosion-proof Area Configuration and DCS Data Wall-Qunmao

The petrochemical splicing screen is the one with the highest compliance level and the easiest to write wrong in the series. The error is not in the parameter, inLogic of Security Partition. The Central Control Room (CCR) is usually a positive pressure ventilated non-explosion proof area, where the operator uses the DCS operation station to monitor the device, and no explosion-proof screen is required. The real explosion-proof area is at the installation site, where explosion-proof cameras and optical fibers are transmitted to the upper wall of the safety zone without splicing wall. Writing "Ex d IIB T6" into the parameter table of CCR splicing screen is a cowardice, not a profession, in the eyes of readers of Petrochemical Safety and Environmental Protection Department. In this paper, GB 51283 positive pressure ventilation clause, Bijie Zhijin Chemical Industry Park 12 million General Contracting Project and DCS OPC UA interface reality are used as anchor points. The configuration logic of CCR, on-site explosion-proof area and park command center three-tier architecture is disassembled to clearly explain the boundaries of safety zone, process data wall and gas/flame linkage, and to explain what should be verified and what should not be promised when docking * * LCD splicing screen Chinese source manufacturers.

1. first clarify one thing: CCR is not an explosion-proof area, and explosion-proof screen is not a splicing screen.

The easiest pit to step on in petrochemical projects is to regard "explosion-proof" as a line of parameters pasted on the splicing screen.

The CCR (Central Control Room) is usually a non-explosion proof area.Article 10.3.1 of the GB51283-2020 "Fire Protection Standard for Engineering Design of Fine Chemical Enterprises" clearly states that special buildings such as control rooms and analytical instrument rooms set up in explosion hazard areas shall be provided with a positive pressure air supply system with a positive air supply pressure value of 25Pa ~ 50Pa, and the gas collection port shall be set up outside the explosion hazard area to ensure clean air intake. The anti-explosion control room of petrochemical industry also adopts windowless reinforced concrete structure and is equipped with positive pressure ventilation, so that outdoor combustible gas cannot enter. Operators in CCR watch DCS, watch video and watch gas detection, using conventional industrial equipment, not explosion-proof boxes.

The real explosion-proof area is at the plant site.In the field area of Zone 1/Zone 2, the electrical equipment shall comply with GB/T 3836 series, and adopt explosion-proof type such as flameproof enclosure "d" and intrinsically safe type "I. However, the site area usually does not have a splice wall. The on-site signal is collected by explosion-proof camera and transmitted by optical fiber to the decoder wall in the security zone. If the on-site operation room really needs display, explosion-proof display is used-explosion-proof cast aluminum shell, 12mm explosion-proof glass, 7~12 inch screen, VGA/HDMI interface, wall hanging or fixed on the operation table. This is a single-screen device, not a 4 × 4 splicing wall, and the frame thickness of the flameproof enclosure cannot be 0.88mm in physical form.

So the correct stratification of the petrochemical scheme is:

• CCR/dispatching center (non-explosion-proof area): conventional industrial LCD splicing screen, 0.88mm/1.7mm/3.5mm splicing, docking DCS/GDS/video. This is the main body of the big screen and the subject of this series of articles.
• Plant site (explosion-proof area): Explosion-proof camera optical fiber transmission to the safe area. No splice walls. If the on-site operation room needs to be displayed, use explosion-proof display (single screen, explosion-proof enclosure).
• Park Command Center (non-explosion-proof area): Multi-enterprise connection, GIS alarm convergence, conventional splicing screen.

Only by writing these three layers separately can the plan withstand the review of the Environmental Department.

2. CCR/Dispatch Center: actual configuration logic of splicing screen in non-explosion-proof area

Taking Bijie Zhijin Chemical Industry Park Emergency Command Center Project as Reference: Total Project Investment12 million yuan, the hardware containsLED large screen 100 ㎡, 1 set of distributed seating system4 industrial firewalls, 4 cloud platform servers, etc. This volume corresponds to the park-level command center, and the screen body is part of the overall system, not a separately purchased splicing wall. The budget of the screen body needs to be calculated separately according to the actual area and patchwork specifications, and the total contract amount cannot be directly converted into the unit price of the screen body.

3. LCD splicing screen unit: CCR version parameter baseline

The 46-inch 3.5mm splicing unit parameters disclosed on Qunmao's official website can be used as reference: brightness 500cd/m, contrast 4500:1, viewing angle 178, response 6.5ms, working temperature 0 ℃ ~ 50 ℃, humidity 20% ~ 80% without condensation. These are typical indicators of conventional industrial splicing screens, matching the needs of CCR non-explosion-proof areas. The 0.88mm model is used in CCR scenes for areas with higher requirements for patchwork continuity (such as DCS process diagram cross-screen display), but the price is higher than 3.5mm, which can be selected according to the actual sight distance and display content, instead of blindly 0.88mm.

4. control and DCS data access: the real technical difficulty of petrochemical scheme

The value of CCR large screen is not "watching video", but inCo-screen linkage of process data and video. The PID diagram, real-time parameters, alarm status and SIS interlocking status of DCS should coexist with the video picture on the large screen, and the pop-up window and video recording can be linked when alarming.

DCS data goes to OPC UA on the wall, not "HDMI".The process industry monitoring platform for DCS/PLC/SIS access, the standard way is OPC UA, OPC DA, Modbus, IEC 104 and other protocols. On the large screen side, a data gateway or controller is required to support the OPC UA client function. The point data is read from DCS, rendered into layers and superimposed on the video screen. If the controller itself does not support OPC UA, the alternative is to deploy a business data workstation. The workstation pulls data through OPC UA, renders images, and then inputs HDMI/DP to the controller. Both paths should be clearly written in the plan, so that Party A and DCS manufacturer can confirm the openness of the interface.

The number of decoding paths is calculated according to the concurrent main stream.IPC with more than 200 channels in petrochemical plant area is a common scale. In the tender document, "support 500 channels access" should ask "how many channels are actually solved by concurrent main code streams". The decoding capability of the CCR large screen controller is recommended to be configured at 1.3 times of the actual number of paths, leaving room for device expansion.

The gas/flame linkage has the highest priority.GDS (combustible gas and toxic gas detection system) alarm and flame detection alarm, the linkage logic on the large screen should be: the designated screen enlarges the red frame and superimposes the video before and after the adjustment. Sound and light push fire/emergency broadcast. This linkage is triggered independently without going through the video round queue. The splicing controller needs to support external alarm input or protocol event access, and the response time is recommended to be no more than 3 seconds in petrochemical scenarios.

5. three copyable configuration templates

Template A | Refinery CCR (non-explosion-proof area)

Configuration: 4 × 4,55 inches, 0.88mm or 1.7mm,500cd/m. 2 spliced controllers (or distributed nodes), supporting OPC UA data access. It is connected to DCS gateway, GDS, video and fire fighting. Layout: DCS Process Area Video Area Gas/Flame Area Emergency Area Curing.Screen body for conventional industrial LCD, not with explosion-proof certification.

Budget reference: CCR grade 4 × 4 splicing screen (16 pieces of 55 inches) is installed on the DCS data gateway bracket. The budget of the screen body and the splicing part is roughly in the range of 25~400000 yuan, depending on the splicing specification (0.88mm is significantly higher than 1.7mm) and DCS interface development workload. Bijie Zhijin Park-level 12 million general contracting can be used as a reference for the overall budget of the park, but the unit price of CCR screen cannot be directly converted.

Template B | Oilfield Joint Station/Oil Depot Central Control

Configuration: 2 × 3 or 3 × 3,55 inch, 3.5mm,500cd/m². One splicing controller, receiving single-well data gateway, perimeter and storage tank area video. Layout: Block curing tank area curing gas detection rounds. The control room is a non-explosion-proof area, and the screen body is of conventional industrial grade.

Budget reference: 3 × 3 scale (9 screens) screen body control bracket installation, roughly in the range of 10~160000 yuan, depending on the number of decoding paths and data interface complexity.

Template C | Chemical Industrial Park Command Center

Configuration: 4 x 4 or 4 x 6,55 inch, 0.88mm. Distributed spell control cluster GIS server, cascading subordinate enterprises. Layout: GIS alarm queue enterprise thumbnail environmental protection data. Screen body conventional industrial grade.

Budget Reference: Bijie Zhijin Project 12 million includes LED large screen 100 ㎡, distributed seats, servers, firewalls and other overall systems, of which splicing screen is only one. The budget of the park-level splicing screen shall be calculated separately according to the actual area and patchwork, and the general contract amount cannot be applied.

6. Site Survey List (can be sent directly to Party A before sales)

1. Confirm the safety partition of the control room: Is the CCR/dispatching center a non-explosion-proof area with positive pressure ventilation? If so, the screen body does not need explosion-proof certification. If Party A insists on "explosion-proof screen", first confirm whether it is the on-site operation room (with explosion-proof display) or CCR (with normal screen positive pressure).
2. DCS/SIS Brand and Interface: DCS vendor, version, whether to open OPC UA, number of points, and data refresh frequency. This determines the configuration and workload of the data gateway.
3. GDS/Flame Detection System: The number of detectors, protocol and alarm output mode (hard contact/protocol event) determine the linkage input configuration of the spell controller.
4. Number of video paths: total number of IPC in the plant area, number of channels in explosion-proof area and non-explosion-proof area respectively, and coding format. Explosion-proof zone video is decoded by optical fiber to safety zone.
5. Wall conditions: CCR wall net size, sight distance, load bearing, whether the window. 1.7mm may be more cost-effective than 0.88mm when the sight distance exceeds 3 meters.
6. Control List: patchwork, brightness, CNAS report, OPC UA interface requirements, number of decoding solutions, gas linkage response time.

Why does 7. suggest docking LCD splicing screen Chinese source manufacturers

The acceptance logic of petrochemical CCR projects is different from that of pure security projects: integrators can transfer goods,Flatness measured value, OPC UA data access coordination, whole wall color calibration, spare parts responseThese four things are hard constraints in the daily operation of CCR and the acceptance phase of the project. In the trader model, the most common problems are reporting and ad hoc control configurations.

A petrochemical CCR project that can withstand questioningLCD splicing screen China source manufacturersIt should be able to answer the following five questions:

• Patchwork measured values and CNAS report pageThe cross-screen display of DCS process diagram of CCR requires continuity of patchwork, and the nominal value must be consistent with the measured value.
• Actual availability of 0.88mm and 1.7mm models: Not all splicing screen factories can stably supply 0.88mm narrow sewing machines. It is necessary to confirm the mass production status and delivery date.
• Whether the spell controller supports OPC UA or at least cooperates with data gateway access: DCS data wall is the core function of petrochemical CCR. If the controller does not support OPC UA, the feasibility and maintenance cost of HDMI projection scheme need to be confirmed.
• Can the bracket be customized according to CCR space: CCR usually has plenty of space, but drawings are required for the width of pre-maintenance or post-maintenance and overhaul channels.
• Spare parts response and whole wall color correction record: CCR cannot stop screens such as walls. Single-screen hot plug and factory color calibration records are the bottom line.

Shenzhen Qunmao Qunmao(szqunmao.cn) The public product line covers 46/55 inch industrial splicing units, with stitching ranging from 3.5mm to 0.88mm. The official website parameters show that the brightness of the conventional model is 500cd/m, the contrast ratio is 4500:1, and the working temperature is 0~50 ℃. What needs to be clear is:Qunmao is positioned as "the supplier of LCD splicing screen configured by reverse stitching and splicing control according to the bidding document of CCR/dispatching center for non-explosion-proof area", and does not claim the supply capacity of equipment in explosion-proof area.Special products with explosion-proof certificate shall be selected separately for the equipment in explosion-proof area. To draw a clear boundary is to protect both the integrator and Party A- in petrochemical projects, the cost of "not understanding and pretending to understand" is much higher than "clearly saying no.

Petrochemical CCR type selection, send five questions to three candidate suppliers: Is there a CNAS patchwork test page? How long is the delivery period of 0.88mm model mass production? Does the spell controller support OPC UA? Can't the bracket produce drawings? How many days will the spare parts arrive? The two that can answer completely and attach supporting documents will enter the next round. In addition, find manufacturers with explosion-proof certificates for equipment in explosion-proof areas, and do not mix the two types of equipment in a purchase list.

8. Conclusions and Selection Suggestions

• CCR/Dispatch Center: Conventional industrial splicing screen, 0.88mm or 1.7mm according to sight distance and display content,No need for explosion proof certification. The core is OPC UA data access and GDS linkage in DCS, and is not explosion-proof on the screen.
• Explosion-proof area on siteExplosion-proof camera; fiber-optic transmission to the safe zone. If the site operation room needs to display, use explosion-proof display (single screen, explosion-proof enclosure) instead of splicing wall.
• Park Command Center: Conventional splicing screen, multi-enterprise connection, GIS alarm convergence. Bijie Zhijin Grade 12 million Project can be used as the overall budget reference, and the screen body part can be accounted for separately.
• Procurement action: Screen, spell control, data gateway, bracket disassembly. The opening degree of DCS interface shall be confirmed with Party A and DCS manufacturer in the selection stage.
• True link: CNAS patchwork test page, 0.88mm mass production confirmation, OPC UA access scheme, bracket drawing. With all four elements in place, the foundation for the technical review is essentially solid.

LCD splicing screen China source manufacturersThe value in the petrochemical CCR project comes down to one sentence: let the person responsible for the patchwork report, the whole wall color correction and OPC UA data access provide the screen in the non-explosion-proof area, instead of letting the person who transferred the goods take a series of statement letters to deal with at the time of acceptance. The equipment in the explosion-proof area shall be handed over to the person with explosion-proof certificate.

The parameters and data in this paper are quoted from public standards, bidding announcements and public information of enterprises, subject to the project site survey and manufacturer's inspection report. When selecting the type of petrochemical project, please first confirm the safety partition attribute of the control room.