Compressor room ventilation, temperature and combustible gas detection interlocking control system

Abstract

The utility model belongs to the technical field of a ventilation system of a compressor unit, and relates to a ventilation, temperature and combustible gas detection interlocking control system of a compressor room, which comprises the compressor unit, electric shutters, a plurality of temperature sensors, a combustible gas detector, a ventilation fan, an explosion-proof distribution box and a station control PLC (Programmable Logic Controller), wherein the electric shutter is controlled by the temperature of the machine room, the concentration of combustible gas and the start and stop of the compressor unit, and the compressor unit, the electric shutter, the temperature sensor, the combustible gas detector and the ventilation fan are all connected with the station control PLC through the explosion-proof distribution box. Temperature loss of the machine room is reduced, fire and explosion accidents caused by leakage and accumulation of combustible gas in the machine room are prevented, and overall safety and stability of equipment in the machine room are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of compressor unit ventilation systems and relates to a compressor room ventilation, temperature and combustible gas detection interlocking control system. Background Art

[0002] Large-diameter vents surround the compressor rooms at natural gas stations. Due to the cold winter weather in northern China, especially in the evenings, outdoor temperatures can reach -30°C. During the hot standby period of the compressor units, the lubricating oil heaters cannot reach the standby temperature (the lubricating oil temperature is 25°C when the compressor is loaded) even with continuous heating due to the low ambient temperature. This affects the normal and stable gas transmission at the station. Furthermore, continuous heating by the lubricating oil heaters increases energy consumption, which is not in line with energy conservation and emission reduction goals. Furthermore, in some areas, strong winds and sandstorms occur in spring and autumn, and extreme sandstorms allow large amounts of dust to enter the equipment room, contaminating the sealing points and precision instruments in the equipment room, affecting the environment within the equipment room.

[0003] Therefore, it is crucial to develop a system that can control ventilation according to temperature. Utility Model Content

[0004] The purpose of the utility model is to provide a compressor room ventilation, temperature and combustible gas detection interlock control system to solve the problems in the above-mentioned prior art that the compressor room cannot reach the standby temperature even when it is continuously heated and is difficult to link with the ventilation system.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A compressor room ventilation, temperature and combustible gas detection interlock control system includes a compressor unit, electric shutters installed at each ventilation outlet of the machine room, several temperature sensors, combustible gas detectors and ventilation fans installed in the machine room, and an explosion-proof distribution box and a station control PLC control cabinet. The electric shutters are controlled by the machine room temperature, combustible gas concentration, and the start and stop of the compressor unit. The compressor unit, electric shutters, temperature sensors, combustible gas detectors and ventilation fans are all connected to the station control PLC through the explosion-proof distribution box.

[0007] Furthermore, the electric blinds are connected in parallel and are all connected to a manual / automatic conversion switch. In the automatic circuit, the station control PLC outputs a 24V power supply to control an intermediate relay coil, and the main circuit contactor is controlled by the normally open contact of the intermediate relay to open or close the electric blinds.

[0008] Furthermore, the temperature sensor is connected to the station control PLC input terminal through a surge protector in series with the terminal. When the temperature exceeds a preset range, the PLC outputs a command to close or open the corresponding electric blinds and ventilation fans.

[0009] Furthermore, each combustible gas detector in the machine room connects its analog signal and digital signal to the input end of the SIS system of the station control PLC cabinet through the combustible gas controller. When it is detected that the combustible gas concentration exceeds the preset concentration threshold, some or all of the compressor units are automatically controlled to shut down, and some or all of the electric shutters and ventilation fans are opened.

[0010] Furthermore, the several ventilation fans are connected in parallel with each other and are all connected to manual / automatic switching switches. In the automatic circuit, the PLC outputs 24V power to control the intermediate relay coil, and the main circuit contactor is controlled by the normally open contact of the intermediate relay to turn on or off the ventilation fan.

[0011] The beneficial technical effects of the present utility model are as follows:

[0012] The utility model realizes the automatic start and stop function of the vents by installing electric shutters at the vents and interlocking the fan and the electric shutters with the temperature and combustible gas detectors. After the indoor temperature is controlled, the standby unit heater stops running after reaching the set upper limit, avoiding continuous heating due to low ambient temperature, improving the hot standby efficiency of the unit and reducing power loss.

[0013] The utility model avoids the behavior of starting the unit by lowering the original set lubricating oil temperature of the unit to ensure production during the peak period of winter transportation. After the transformation, the temperature of the machine room can be controlled and the oil temperature of the unit is within the controllable range, ensuring the safe standby of the unit and reducing equipment accidents caused by temperature unsatisfactory.

[0014] The utility model realizes temperature control of the fan and electric shutters without changing the ventilation volume in the computer room, thereby reducing temperature loss in the computer room, preventing the accumulation of combustible gas in the computer room from causing fire and explosion accidents, and improving the overall safety and stability of the equipment in the computer room.

[0015] The utility model avoids the problem of needing to clean the equipment and environment of the computer room from time to time. The ventilation openings are automated through transformation. When the machine is not started, the electric shutters in the computer room are closed, making the computer room relatively airtight, improving the internal environment of the computer room and saving labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the connection relationship of each module of the utility model;

[0017] Figure 2 This is the principle diagram of automatic / manual control of electric shutters in the compressor room of this utility model;

[0018] Figure 3 This is the PLC wiring diagram for the compressor room temperature sensor;

[0019] Figure 4PLC wiring diagram for the start / stop control of 4 electric shutters in the compressor room;

[0020] Description of the drawings: 1- compressor unit, 2- electric shutters, 3- temperature sensor, 4- combustible gas detector, 5- ventilation fan, 6- explosion-proof distribution box, 7- station control PLC. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 As shown, the utility model provides a compressor room ventilation, temperature and combustible gas detection interlock control system, including a compressor unit 1, electric shutters 2 installed at the ventilation openings of each machine room, a number of temperature sensors 3, combustible gas detectors 4, ventilation fans 5, explosion-proof distribution boxes 6 and station control PLC 7 arranged in the machine room, wherein the electric shutters 2 are controlled by the machine room temperature, combustible gas concentration and the start and stop of the compressor unit 1, and the compressor unit 1, the electric shutters 2, the temperature sensors 3, the combustible gas detectors 4 and the ventilation fans 5 are all connected to the station control PLC 7 through the explosion-proof distribution box 6.

[0023] Example:

[0024] The explosion-proof distribution box 6 includes a shutter explosion-proof distribution box and a fan explosion-proof distribution box, which are respectively connected to the main circuit and control circuit of the electric shutter 2 and the ventilation fan 5.

[0025] The four silenced ventilation vents in the computer room were upgraded and renovated, with four electric shutters 2 and ten ventilation fans 5 installed. The electric shutters 2 have automatic and manual switches, with manual control available on-site and remotely (via the station control room HMI). The automatic operation of the electric shutters 2 is controlled by the computer room temperature, combustible gas concentration, and the start and stop of the compressor units. Secondly, a temperature sensor 3 was added to monitor the room's ambient temperature. The signal from the temperature sensor 3 is connected to the station control PLC cabinet 7 for interlocking control and display on the HMI. The computer room temperature signal, the combustible gas detector 4 signal, the electric shutter 2 signal, and the fan start and stop signal are programmed through the station control PLC controller for interlocking control according to the designed logic.

[0026] Manual start and stop

[0027] When the main circuit power circuit breaker QF0 and QF1 are closed, and the 1# shutter knob switch in the secondary circuit is in the "manual" position, after pressing the start button SB2, the AC contactor KM1 is energized and attracted, the normally open contacts of the AC contactor KM1 are closed, the main circuit is connected, the 1# shutter opens, and the running indicator green light HG1 is on; when the stop button SS1 is pressed, the AC contactor KM1 loses power and disconnects, the normally open contacts of the AC contactor KM1 are disconnected, the main circuit is disconnected, the 1# shutter stops, and the stop indicator light HR1 is on;

[0028] The main power switch QF0 is connected in series with QF1 (QF2, QF3, QF4 are connected in parallel with QF1), KM1 is connected in series with QF1, KM2 is connected in series with QF2, KM3 is connected in series with QF3, and KM4 is connected in series with QF4.

[0029] 1-4-way blinds control: Control power supply L is connected in series with the manual-automatic transfer switch, the manual circuit is connected in series with the stop button SS1, SS1 is connected in series with the start button SB2, SB2 is connected in series with the coil of contactor KM1, the KM1 coil is connected to neutral, the KM1 normally open contact is connected in parallel with the start button SB2, and the green light HG1 is connected in parallel with the KM1 coil. The automatic circuit is connected in series with the KA1 normally closed contact, which is connected in series with the KA2 normally open contact, which is connected in parallel with the KM1 latching contact. The red light HR1 is connected in series with the KM1 normally closed contact and connected in parallel with the power supply L and neutral.

[0030] Automatic start and stop

[0031] The signals of 1#2#3#4# electric blinds are connected in series to terminal TBD001 through PLC, and then connected to relay D001-RE12.13.14.15 coils to control 1#2#3#4# electric blinds respectively.

[0032] When the main circuit power circuit breaker QF0 is closed, QF1 is closed, and the 1# shutter knob switch in the secondary circuit is set to the "automatic" position, the intermediate relay KA2 of the secondary circuit is energized (the energized digital signal comes from the station control system after logical programming judgment and is passed Figure 3 12# relay output in relay DO01-RE), the normally open contact of the intermediate relay is closed, the AC contactor KM1 is energized and attracted, the normally open contact of the AC contactor KM1 is closed, the main circuit is connected, the 1# shutter is opened, and the running indicator green light HG1 is on.

[0033] Computer room temperature control:

[0034] The signal from compressor room temperature sensor 3 is connected in series with terminal TBAI06, the surge protector, and the PLC input. When any of the three units is operating with its intake valve fully open, if the temperature is less than or equal to -15°C, the 1# and 3# louvers on the two opposite units are closed. If the temperature is greater than or equal to -5°C, the 1# and 3# louvers on the two opposite units are opened. The 2# and 4# louvers remain open and are not involved in the temperature interlock.

[0035] When any of the three units is running and the air inlet valve is fully opened, and the temperature is less than or equal to -10℃, the five fans are turned off; when the temperature is greater than or equal to 0℃, the five fans are started.

[0036] Combustible gas detector control: has the highest priority

[0037] Under any circumstances (when the unit is running or on standby, at any ambient temperature), when the combustible gas concentration of any of the six combustible gas detectors in the machine room reaches 20%LEL, the ten fans will be started and the four shutters (two groups) will be fully opened; when the concentration of all six combustible gas detectors is lower than 5%LEL, the shutters will be closed and the fans will be turned off.

[0038] Compressor unit start and stop control

[0039] When any one of the three units is running and the air inlet valve is fully closed, open the four shutters and start the five fans after a delay of 5 seconds; when all three units are stopped, the five fans are running and closed after a delay of 60 seconds, and the four shutters are closed after a delay of 120 seconds.

[0040] The contents not described in detail in the above specification belong to the prior art known to those skilled in the art. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A compressor room ventilation, temperature and combustible gas detection interlock control system, characterized by: The system comprises a compressor unit (1), electric shutters (2) installed at each ventilation opening in the machine room, a number of temperature sensors (3), combustible gas detectors (4) and ventilation fans (5) installed in the machine room, and an explosion-proof distribution box (6) and a station control PLC (7). The electric shutters (2) are controlled by the machine room temperature, combustible gas concentration, and the start and stop of the compressor unit (1). The compressor unit (1), the electric shutters (2), the temperature sensors (3), the combustible gas detectors (4) and the ventilation fans (5) are all connected to the station control PLC (7) through the explosion-proof distribution box (6).

2. The compressor room ventilation, temperature and combustible gas detection interlock control system according to claim 1, characterized in that: The electric blinds (2) are connected in parallel and are all connected to a manual / automatic switch. In the automatic circuit, the station control PLC (7) outputs a 24V power supply to control an intermediate relay coil, and the main circuit contactor is controlled by the normally open contact of the intermediate relay to open or close the electric blinds.

3. The compressor room ventilation, temperature and combustible gas detection interlock control system according to claim 1, characterized in that: The temperature sensor (3) is connected to the input end of the station control PLC (7) through a terminal block in series with a surge protector. When the temperature exceeds a preset range, the PLC outputs a command to close or open the corresponding electric shutter (2) and ventilation fan (5).

4. The compressor room ventilation, temperature and combustible gas detection interlock control system according to claim 1, characterized in that: Each combustible gas detector (4) in the machine room connects its analog signal and digital signal to the input end of the SIS system of the station control PLC (7) through the combustible gas controller. When it is detected that the combustible gas concentration exceeds a preset concentration threshold, part or all of the compressor units (1) are automatically controlled to stop, and part or all of the electric shutters (2) and ventilation fans (5) are opened.

5. The compressor room ventilation, temperature and combustible gas detection interlock control system according to claim 1, characterized in that: The plurality of ventilation fans (5) are connected in parallel with each other and are all connected to a manual / automatic switch. In the automatic circuit, the PLC outputs a 24V power supply to control the intermediate relay coil, and the intermediate relay normally open contact controls the main circuit contactor to turn on or off the ventilation fans (5).

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