Total flue damper device

Abstract

The invention relates to a main flue flashboard device. The two side portions of a flashboard are flat, a flashboard support is matched with the two side portions of the flashboard in shape, a flashboard bottom plate is provided with a bottom groove matched with the flashboard, the flashboard can fall into the bottom groove when closed, the flashboard bottom plate is fixedly connected with the bottom of a flue, and the flashboard support penetrates through the flue to the position above the ground. An air cylinder is arranged on an upper cross beam at the top end of the flashboard support, a cylinder rod of the air cylinder is fixedly connected with the flashboard, a base of the air cylinder is fixedly connected with the upper cross beam, the air cylinder is driven by an electromagnetic valve, and a first limiting switch and a second limiting switch are sequentially arranged on the two sides of the flashboard support from top to bottom. The second limiting switch is used for detecting a gate plate in-place closing signal. The device has the advantages that the cylinder is arranged on the upper cross beam and is driven by the electromagnetic valve YV, when a desulfurization and denitrification system fails in operation or flue suction is insufficient and emergency accidents such as power failure of a whole plant occur, the flashboard is opened, the cylinder drives the flashboard to act, and the device is simple in structure, safe and reliable.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas treatment, and in particular to a main flue damper device. Background Art

[0002] With the desulfurization and denitrification system put into operation, production safety hazards also increase. It is necessary to install a cut-off gate on the path from the flue to the emission chimney to cut off the ventilation to the emission chimney, so as to achieve the purpose of extracting the flue gas for reuse. The existing gate manual lifting device requires two people to manually pull up the gate. The main flue gate is manually lifted, and the lifting speed is slow, which cannot meet the production process requirements. It is difficult for operators to operate, the operating environment is poor, and there are safety hazards. Summary of the invention

[0003] The purpose of the present invention is to provide a main flue damper device, which does not require manual lifting of the damper and is simple to operate, safe and reliable.

[0004] To achieve the above object, the present invention is implemented through the following technical solutions:

[0005] A main flue damper device comprises a damper bracket, a damper, a damper bottom plate and a control unit. The two sides of the damper are flat, the damper bracket is adapted to the shape of the two sides of the damper, the damper bottom plate is provided with a bottom groove adapted to the damper, the damper can fall into the bottom groove when closed, the damper bottom plate is fixedly connected to the bottom of the flue, the damper bracket passes through the flue to above the ground, an upper crossbeam at the top of the damper bracket is provided with a cylinder, the cylinder rod of the cylinder is fixedly connected to the damper, the base of the cylinder is fixedly connected to the upper crossbeam, the cylinder is driven by an electromagnetic valve, and limit switch 1 and limit switch 2 are arranged on both sides of the damper bracket from top to bottom in sequence, the limit switch 1 is used to detect the damper opening position signal, the limit switch 2 is used to detect the damper closing position signal, the electromagnetic valve, the limit switch 1 and the limit switch 2 are respectively connected to the control unit.

[0006] The control unit includes a control loop and a PLC, and the control loop is connected to the PLC.

[0007] The control circuit includes an operation circuit and a status indication circuit connected in parallel. The input end of the operation circuit is connected to the output end of the circuit breaker. The input end of the circuit breaker is connected to an AC power supply. The operation circuit includes a local operation circuit, a remote operation circuit, and a solenoid valve operation circuit. The local operation circuit is connected to the remote operation circuit, and the solenoid valve operation circuit is connected in parallel with the status indication circuit.

[0008] The local operation circuit includes the normally open contact 1 of the transfer switch SA, the normally open contact of the start button SB, the normally closed contact of the stop button SP, and the coil of the relay KA connected in series, and the normally open contact 1 of the relay KA is connected in parallel with the coil of the relay KA;

[0009] The remote operation circuit includes the normally open contact 2 of the conversion switch SA and the normally open contact K1 of the PLC connected in series, and the normally open contact 2 of the relay KA is connected in parallel with the normally open contact K1 of the PLC;

[0010] The normally open contact three of relay KA is connected in series with the solenoid valve.

[0011] The status indication circuit includes a fully open indication circuit and a fully closed indication circuit connected in parallel. The fully open indication circuit includes a normally open contact and a fully open indicator light of a limit switch 1 connected in series. The fully closed indication circuit includes a normally open contact and a fully closed indicator light of a limit switch 2 connected in series.

[0012] The PLC includes a CPU module, and the normally open contact K1 of the PLC is connected to the digital output port of the CPU module.

[0013] The cylinder is connected with the gas storage tank through a pipeline, the control unit and the electromagnetic valve are arranged in the operation box, and the gas storage tank and the operation box are arranged on the ground.

[0014] The upper crossbeam is also equipped with an electric hoist, and the gate is connected to the electric hoist through a wire rope.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The upper beam is equipped with a cylinder, which is driven by the solenoid valve YV. When the desulfurization and denitrification system fails or there is an emergency such as insufficient flue suction or power outage in the whole plant, the gate is opened and the cylinder drives the gate to move. The structure is simple, safe and reliable.

[0017] 2. The upper beam is equipped with an electric hoist. When the cylinder fails, the counterweight is lowered by the electric hoist to open the gate, or the counterweight is manually lifted by the electric hoist to close the gate, thereby improving production safety;

[0018] 3. The solenoid valve YV, the fully open limit switch SQO, and the fully closed limit switch SQC are connected to the control unit respectively. The on-site operator can check the gate operation status at any time through the fully open indicator HD2 and the fully closed indicator HD3 on the ground operation box, which is simple to maintain and saves time and effort;

[0019] 4. The normally open contact 2 of the transfer switch SA and the normally open contact K1 of the PLC, the normally open contact 1 of the transfer switch SA, the normally open contact of the start button SB, the normally closed contact of the stop button SP, the coil of the relay KA, and the normally open contact 3 of the relay KA are connected in series with the solenoid valve YV, which is convenient for the operator to realize the local operation and remote operation of the switching gate through the transfer switch SA. The structure is simple and easy to implement;

[0020] 5. The normally open contact 3 of SA, the normally open contact of the fault relay KT1, the fully open signal KA2, and the fully closed signal KA3 are respectively connected to the digital input port of the CPU module, so that the operators in the control room can check the running status of the gate at any time. The normally open contact K1 of the PLC is connected to the digital output port of the CPU module. The operators in the control room can open / close the gate through the start / stop button on the HMI human-machine interaction screen, without manually lifting the gate, eliminating safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of the main flue damper control device.

[0022] Figure 2 Schematic diagram of the AA structure of the main flue damper control device.

[0023] Figure 3 It is a schematic diagram of the electrical principle of the main flue damper control device.

[0024] In the figure: 1-gate 2-gate bracket 3-gate bottom plate 4-flue 5-cylinder 6-electric hoist 7-upper beam 8-full open limit switch SQO 9-full close limit switch SQC 10-operating box 11-gas storage tank 12-wire rope 13-counterweight 14-rain shelter 15-middle limit switch. DETAILED DESCRIPTION

[0025] The present invention is described in detail below in conjunction with the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0026] The following examples are implemented on the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0027] [Example 1]

[0028] See Figure 1 ,See Figure 2A control device for a main flue 4 gate 1 includes a gate bracket 2, a gate 1, a gate bottom plate 3, and a control unit. The gate 1 has flat sides. The gate bracket 2 is adapted to the shapes of the sides of the gate 1. The gate bottom plate 3 is provided with a bottom groove adapted to the gate 1. The gate 1 can fall into the bottom groove when closed. The gate bottom plate 3 is fixedly connected to the bottom of the flue 4. The gate bracket 2 passes through the flue 4 to the ground. The upper crossbeam 7 at the top of the gate bracket 2 is provided with a cylinder 5. The cylinder rod of the cylinder 5 is fixedly connected to the gate 1. The base of the cylinder 5 It is fixedly connected to the upper crossbeam 7, and the cylinder 5 is driven by the electromagnetic valve YV. The two sides of the gate bracket 2 are provided with a full-open limit switch SQO and a full-close limit switch SQC in sequence from top to bottom. The full-open limit switch SQO is used to detect the signal that the gate 1 is opened to the full position; the cylinder 5 is connected to the gas tank 11 through a pipeline, the control unit and the electromagnetic valve YV are arranged in the operation box 10, and the gas tank 11 and the operation box 10 are arranged on the ground; the upper crossbeam 7 is also provided with an electric hoist 6, and the gate 1 is connected to the electric hoist 6 through a wire rope 12.

[0029] See Figure 3 The control circuit includes an operation circuit and a status indication circuit connected in parallel. The input end of the operation circuit is connected to the output end of the circuit breaker, and the input end of the circuit breaker is connected to the UPS AC power supply AC220V. The operation circuit includes a local operation circuit, a remote operation circuit, an electromagnetic valve YV operation circuit, and a fault circuit. The local operation circuit is connected to the remote operation circuit. The electromagnetic valve YV operation circuit, the status indication circuit, and the fault circuit are connected in parallel. The local operation circuit includes a normally open contact 1 of a series-connected conversion switch SA, a normally open contact of a start button SB, a normally closed contact of a stop button SP, and a coil of a relay KA. The normally open contact 1 of the relay KA is connected in parallel with the coil of the relay KA; the remote operation circuit includes a normally open contact 2 of the series-connected conversion switch SA and a normally closed contact of a stop button SP. The normally open contact K1 of the PLC and the normally open contact 2 of the relay KA are connected in parallel with the normally open contact K1 of the PLC; the normally open contact 3 of the relay KA is connected in series with the coil of the solenoid valve YV; the status indication circuit includes a fully open indication circuit and a fully closed indication circuit connected in parallel, the fully open indication circuit includes the normally open contact of the fully open limit switch SQO connected in series and the fully open indicator light HD2, the coil of the relay KA2 is connected in parallel with the fully open indicator light HD2, the fully closed indication circuit includes the normally open contact of the fully closed limit switch SQC connected in series and the fully closed indicator light HD3, the coil of the relay KA3 is connected in parallel with the fully closed indicator light HD3; the fault circuit includes the normally open contact 4 of KA1, the normally closed contact of the relay KA2, and the coil of the time relay KT1 connected in series.

[0030] The PLC includes a CPU module. The normally open contact K1 of the PLC is connected to the digital output port of the CPU module. The normally open contact three of SA, the normally open contact of the fault relay KT1, the fully open signal KA2 (that is, the normally open contact of relay KA2), and the fully closed signal KA3 (that is, the normally open contact of relay KA3) are respectively connected to the digital input port of the CPU module.

[0031] Working process:

[0032] The opening of the gate is interlocked with the desulfurization and denitration system: when the desulfurization and denitration system is working normally, the gate is in a normally closed state; when the desulfurization and denitration system fails, or the flue suction is insufficient to reach the interlock setting value, or there is an emergency accident of power outage in the whole plant, the gate is opened by the interlock, and the opening method is cylinder action, the counterweight 13 connected to the gate is unhooked, the counterweight falls and lifts the gate, and the gate is required to open quickly, and the time does not exceed 5s; when the desulfurization and denitration system resumes operation, the counterweight is lifted by the on-site manual operation of the electric hoist to close the gate. The cylinder solenoid valve is always powered by the UPS power supply, which is located in the central control room. The power supply is first connected to the UPS power supply. When the whole plant is out of power or an unexpected failure requires emergency start of the cylinder solenoid valve, the central control room provides a UPS power start signal, and the UPS power starts the cylinder solenoid valve to unhook the counterweight box and quickly lift the main flue gate; no matter where the proximity switch is located, the emergency start of the cylinder solenoid valve is the top priority action.

[0033] The upper crossbeam of the present invention is provided with a cylinder, which is driven by a solenoid valve YV. When the desulfurization and denitrification system fails to operate or there is insufficient suction in the flue or there is an emergency such as power outage in the whole plant, the gate is opened and the cylinder drives the gate to move. The structure is simple, safe and reliable. The upper crossbeam is provided with an electric hoist. When the cylinder fails, the counterweight is lowered by the electric hoist to open the gate, or the counterweight is manually lifted by the electric hoist to close the gate, thereby improving production safety. The solenoid valve YV, the full-open limit switch SQO, and the full-close limit switch SQC are respectively connected to the control unit, and the on-site operator can check the operating status of the gate at any time through the full-open indicator HD2 and the full-close indicator HD3 on the ground operating box, which is simple to maintain and saves time and effort. The normally open contact 2 of the conversion switch SA and the normally open contact K1 of the PLC, the conversion switch SA The normally open contact 1, the normally open contact of the start button SB, the normally closed contact of the stop button SP, the coil of the relay KA, and the normally open contact 3 of the relay KA are connected in series with the solenoid valve YV, which is convenient for the operator to realize local operation and remote operation of switching the gate through the conversion switch SA. The structure is simple and easy to implement; the normally open contact 3 of SA, the normally open contact of the fault relay KT1, the full open signal KA2, and the full close signal KA3 are respectively connected to the digital input port of the CPU module, so that the operator in the control room can check the running status of the gate at any time, and the normally open contact K1 of the PLC is connected to the digital output port of the CPU module. The operator in the control room can realize the opening / closing operation of the gate through the start / stop button on the HMI human-computer interaction screen, without manually lifting the gate, eliminating safety hazards.

Claims

1. A main flue damper device, characterized in that: It includes a gate bracket, a gate, a gate bottom plate, and a control unit. The two sides of the gate are flat, and the gate bracket is adapted to the shape of the two sides of the gate. The gate bottom plate is provided with a bottom groove adapted to the gate, and the gate can fall into the bottom groove when closed. The gate bottom plate is fixedly connected to the bottom of the flue, and the gate bracket passes through the flue to above the ground. The upper crossbeam at the top of the gate bracket is provided with a cylinder, the cylinder rod of the cylinder is fixedly connected to the gate, and the base of the cylinder is fixedly connected to the upper crossbeam. The cylinder is driven by an electromagnetic valve, and limit switch 1 and limit switch 2 are arranged on both sides of the gate bracket from top to bottom. Limit switch 1 is used to detect the gate opening position signal, and limit switch 2 is used to detect the gate closing position signal. The electromagnetic valve, limit switch 1, and limit switch 2 are respectively connected to the control unit.

2. A main flue damper device according to claim 1, characterized in that: The control unit comprises a control loop and a PLC, and the control loop is connected to the PLC.

3. A main flue damper device according to claim 2, characterized in that: The control circuit includes an operation circuit and a status indication circuit connected in parallel, the input end of the operation circuit is connected to the output end of the circuit breaker, the input end of the circuit breaker is connected to the AC power supply, the operation circuit includes a local operation circuit, a remote operation circuit, and a solenoid valve operation circuit, the local operation circuit is connected to the remote operation circuit, and the solenoid valve operation circuit is connected in parallel with the status indication circuit.

4. A main flue damper device according to claim 3, characterized in that: The local operation circuit includes a normally open contact 1 of the transfer switch SA, a normally open contact of the start button SB, a normally closed contact of the stop button SP, and a coil of the relay KA connected in series, and the normally open contact 1 of the relay KA is connected in parallel with the coil of the relay KA; The remote operation circuit includes the normally open contact 2 of the conversion switch SA and the normally open contact K1 of the PLC connected in series, and the normally open contact 2 of the relay KA is connected in parallel with the normally open contact K1 of the PLC; The normally open contact three of relay KA is connected in series with the solenoid valve.

5. A main flue damper device according to claim 3, characterized in that: The status indication circuit includes a fully open indication circuit and a fully closed indication circuit connected in parallel. The fully open indication circuit includes a normally open contact and a fully open indicator light of a limit switch 1 connected in series. The fully closed indication circuit includes a normally open contact and a fully closed indicator light of a limit switch 2 connected in series.

6. A main flue damper device according to claim 4, characterized in that: The PLC comprises a CPU module, and the normally open contact K1 of the PLC is connected to the digital quantity output port of the CPU module.

7. A main flue damper device according to claim 1, characterized in that: The cylinder is connected to the gas storage tank through a pipeline, the control unit and the electromagnetic valve are arranged in the operation box, and the gas storage tank and the operation box are arranged on the ground.

8. A main flue damper device according to claim 1, characterized in that: The upper crossbeam is also provided with an electric hoist, and the gate plate is connected to the electric hoist through a steel wire rope.

Images