CN107327855B

CN107327855B - Raw coke oven gas diffusing and igniting device

Info

Publication number: CN107327855B
Application number: CN201710619139.8A
Authority: CN
Inventors: 骆长平; 陈弟钦; 凌智勇; 韦华; 刘有冠; 杨名红; 韦俊克; 周鹤亭; 吴成强; 叶喆彧; 熊庆达; 陈俊任
Original assignee: Liuzhou Iron and Steel Co Ltd
Current assignee: Liuzhou Iron and Steel Co Ltd
Priority date: 2017-07-26
Filing date: 2017-07-26
Publication date: 2023-06-06
Anticipated expiration: 2037-07-26
Also published as: CN107327855A

Abstract

The invention discloses a raw coke oven gas diffusing and igniting device, and relates to the technical field of metallurgical coking; including the diffusion pipe with the gas collecting tube intercommunication the diffusion pipe is equipped with the water seal valve, the outside of diffusion pipe is close to the department of diffusing the mouth and is equipped with the ignition unit, the ignition unit is connected its characterized in that with ignition transformer: the water seal valve is connected with the winch, the diffusing pipe is positioned at the downstream of the water seal valve in the air flow direction and is communicated with a nitrogen pipeline, the nitrogen pipeline is provided with a nitrogen electromagnetic valve controlled by a controller, the diffusing port is provided with a temperature sensor for detecting the combustion state, and the gas collecting pipe is connected with a pressure transmitter; the controller receives signals of the temperature sensor and the pressure transmitter and controls the winch and the nitrogen electromagnetic valve. The invention can solve the problems of lag response, high cost and high labor intensity of workers.

Description

Raw coke oven gas diffusing and igniting device

Technical Field

The invention relates to the technical field of metallurgical coking, in particular to a device for diffusing and igniting raw coke oven gas.

Background

In the coking industry, the characteristics of intermittent coal charging and coke discharging production of a coke oven and continuous coking process operation determine the problem of raw coke oven gas diffusion under the emergency conditions of planned overhaul of the coke oven or raw coke oven gas conveying failure and the like, and in order to avoid direct diffusion of polluted environment, an ignition diffusion mode is generally adopted. The ignition diffusion comprises 2 steps of diffusion and ignition, and currently, 4 control modes are available: manual diffusing and igniting, manual diffusing and 'pilot burner' (which can quickly ignite raw gas when diffusing coke oven gas fire prepared for a long time at the diffusing pipe orifice), manual diffusing and automatic igniting, automatic diffusing and automatic igniting. The problems of delayed response, severe operation environment and high labor intensity exist in manual ignition and release; the labor intensity of manual diffusing and automatic ignition is reduced, but the problems of response lag and severe operation environment still exist, and the investment of the existing automatic ignition device is high; the "long open fire" is basically the same as the 3 rd mode, and although there is no problem of high disposable investment of the existing automatic ignition device, the raw gas is not scattered frequently by the coke oven, which causes energy waste, for example: group of 2X 60 hole coke ovens 'Changming lamps' consume 20 ten thousand Nm in year ³ The cost of the coke oven gas is about 20 ten thousand yuan.

The automatic diffusing and igniting device for the coke oven raw gas can simplify operation and reduce labor intensity, but still belongs to a manual or semi-automatic control mode. The main disadvantages are:

(1) The ignition device or element is in direct contact with or too close to the fire source, so that the service life of the ignition device or element is short and the stability is poor.

(2) The raw gas diffusing water seal valve is controlled by an electric or pneumatic actuator, and after the raw gas is ignited, the actuator is directly exposed to severe environments such as high temperature, dust, corrosive gas and the like, so that the elements are easy to damage and the failure rate is high.

(3) For a coke oven, the gas collecting pipe has high pressure, is integral, has extremely strong damage to the oven body and related facilities and transient environmental pollution, and is generally provided with 2 or 4 raw gas diffusing pipes, and the coke oven is opened and diffused as soon as possible to relieve pressure in emergency. However, the existing automatic diffusing actuator controls a single raw gas diffusing water seal valve in a one-to-one mode, so that each diffusing pipe cannot be synchronously and rapidly opened, and the input and maintenance workload of the actuator are increased.

Disclosure of Invention

The invention aims to provide a raw coke oven gas diffusing and igniting device, which can solve the problems of lag response, high cost and high labor intensity of workers.

In order to solve the problems, the invention adopts the following technical scheme: the raw coke oven gas diffusing and igniting device comprises a diffusing pipe communicated with a gas collecting pipe, wherein the diffusing pipe is provided with a water seal valve, the outer side of the diffusing pipe is provided with an igniting unit close to a diffusing port, the igniting unit is connected with an igniting transformer, the water seal valve is connected with a winch, the diffusing pipe is positioned at the downstream of the water seal valve in the air flow direction and is communicated with a nitrogen pipeline, the nitrogen pipeline is provided with a nitrogen electromagnetic valve controlled by a controller, the diffusing port is provided with a temperature sensor for detecting the combustion state, and the gas collecting pipe is connected with a pressure transmitter; the controller receives signals of the temperature sensor and the pressure transmitter and controls the winch and the nitrogen electromagnetic valve.

Among the above technical schemes, more specific schemes may be: the ignition unit comprises a fixing piece and an ignition needle, wherein the fixing piece and the ignition needle are installed on the outer side of the upper end of the orifice of the diffusing pipe, the fixing piece is used for fixing a pull rod, a regulator is installed on the pull rod, and the ignition needle penetrates through a sleeve of the fixing piece to be connected with the regulator.

Further: the ignition units are two sets and are respectively arranged at two sides of the diffusing port of the same diffusing pipe.

Further: the four water seal valves of the four diffusing pipes are controlled by the same winch.

Further: the controller is a PLC controller.

Further: the ignition unit comprises a pipeline, a plurality of fire guide holes are axially formed in the pipe wall at one side of the pipeline, a fire guide groove is formed in one side of the fire guide holes outside the pipeline, the ignition needle is arranged at the outer side of the fire guide groove, the needle end of the ignition needle extends into the fire guide groove, and the lower end of the pipeline is connected with an electromagnetic valve for controlling the input of combustible gas.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the beneficial effects that: because the invention is provided with the pressure transmitter and the temperature sensor, when the pressure of the gas collecting tube reaches or exceeds a set value, the controller controls the ignition needle to ignite, and when the temperature sensor detects that the temperature of the diffusing tube reaches the set value, the ignition is successful.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is an ignition control flow chart of the present invention.

Fig. 3 is a schematic diagram of the structure of the ignition unit of embodiment 1.

Fig. 4 is a schematic diagram of the structure of an ignition unit of embodiment 2.

Detailed Description

The invention is further described in detail below with reference to the attached drawings and examples:

example 1

The raw coke oven gas diffusing and igniting device shown in fig. 1, 2 and 3 comprises a diffusing pipe 6 communicated with a gas collecting pipe 3, wherein one end of the diffusing pipe 6 near the gas collecting pipe 3 is provided with a water seal valve 5, one side of the diffusing pipe 6 is provided with an igniting unit, and the igniting unit consists of an igniting needle 7, a regulator 20 capable of regulating the height distance and the angle direction of the igniting needle, a fixing piece 8 and an igniting needle auxiliary electrical system; the fixing piece 8 is made of an insulating porcelain bottle, a positioning bolt and a phi 12× (100-150) millimeter sleeve 19, the sleeve 19 is made of 304 stainless steel, the fixing piece 8 is arranged on the outer side of the upper end of a pipe orifice of the diffusing pipe, the regulator 20 is made of phi 12× (250-300) millimeter 304 stainless steel, the top of the regulator 20 is closed, a DN10 nut is welded at the lower part of the regulator 20, and the regulator 20 is arranged on a connecting rod in a shape of a 'L'; the upper section of the ignition needle 7 passes through a phi 12X (100-150) millimeter sleeve 19 of the fixing piece 8, then the lower end of the ignition needle is welded at the top of the regulator, the tail end of the lower section of the ignition needle 7 is provided with an M4.0X 0.7 millimeter stainless steel screw rod, the ignition needle 7 rotates through a connecting rod, the angle direction and the height distance of the ignition needle 7 from a raw gas diffusing pipe orifice can be adjusted, and the ignition needle is convenient for later adjustment and disassembly. The ignition needle auxiliary electrical system consists of a special high-voltage-resistant cable and a control circuit thereof. The control circuit is arranged in the on-site electric control box, is in a inching control mode, does not have a self-protection function, comprises a button, a relay, a contactor and the like, and reserves a PLC control input interface and a PLC control output interface. The on-site electric control box of the ignition unit is connected with an ignition transformer 9, the ignition transformer 9 boosts the input 220VAC to 8KV pulse output, the input end of the ignition transformer 9 is connected with the output end of a contactor of a control circuit through a high-temperature-resistant cable, and the output end of the ignition transformer 9 is connected with an M4.0 multiplied by 0.7 mm stainless steel screw rod at the tail end of the lower section of the ignition needle 7 through a special high-temperature-resistant cable. The ignition units are symmetrically arranged in the same diffusing pipe opening according to a standby mode, are respectively connected with 2 ignition transformers (arranged at the ventilation position of the back face of the gas collecting pipe small room and far away from a fire source), and are output and controlled by the same contactor in a control circuit so as to ensure the ignition reliability.

The water seal valve 5 is connected with the windlass 1 through a steel wire rope with the diameter phi 4 square millimeters, and the heavy hammer type swing arms of the four blow-off pipe water seal valves of each coke oven are connected in parallel in sequence by the traction of the steel wire rope with the diameter phi 4 millimeters and then are connected to the 1 220VAC small windlass at the tail end of the blow-off platform of the coke oven through a total steel wire rope. The electric system controls the forward and reverse rotation of the windlass, realizes the simultaneous opening and closing operation of the water seal valves of the 4 diffusing pipes, and controls the diffusing or cutting-off of the raw gas. In the electric system of the diffusing pipe, the forward rotating loop is shared with the starting loop of the ignition device, so that the diffusing and the ignition are performed simultaneously; the reverse loop is independently arranged and consists of a button, a relay, a reversing capacitor and a contactor, and a PLC control input interface and a PLC control output interface are reserved for inching operation without a self-protection function. During forward rotation, the steel wire rope is tensioned by the traction force of the winch 1, and meanwhile, the 4 diffusing pipe water seal valves 5 are opened; when the winch is reversed, the winch 1 is loosened, and the water seal valve 5 is reset by the dead weight of the swing arm weight. A bidirectional travel limit switch 2 is arranged at the position 3-4 m in front of the windlass 1, and is positioned at the position 0.4-0.5 m below the total steel wire rope and is positioned on the same plane with the windlass 1. Two steel wire ropes with the length of 1.5 meters and the diameter of phi 4 mm are used for connecting the swing arm of the limit switch 2 to the total steel wire rope from the forward direction and the reverse direction respectively. The normally closed contact signal outputs of the limit switch 2 in the forward and reverse directions are respectively connected in the forward and reverse loops of the electric system of the diffusing pipe in series, and are used for triggering the interlocking stop action when the stroke is in place. One side of the diffusing pipe is provided with a nitrogen pipeline, the nitrogen pipeline is positioned at the downstream of the air flow direction of the water seal valve 5, the nitrogen pipeline is provided with a nitrogen electromagnetic valve 10, and a diffusing port of the diffusing pipe 6 is provided with a temperature sensor 11 for detecting the temperature of the diffusing pipe 6. The winch 1, the nitrogen electromagnetic valve 10 and the temperature sensor 11 are all electrically connected with the PLC 12, and the PLC 12 is connected with the gas collecting tube 3 through the pressure transmitter 13.

The gas collecting tube pressure detection signal used for triggering ignition is a measured value of a gas collecting tube pressure transmitter of each section in the original coke oven heating PLC system; each diffusing pipe is provided with a temperature sensor for detecting the temperature, the temperature sensor 11 is a K-type thermocouple and is vertically fixed, the measuring end is upwards and reversely arranged on the side surfaces of the two insulating porcelain bottles, and the distance between the measuring end and the diffusing pipe orifice is 300mm. The nitrogen electromagnetic valve 10 is normally closed, is arranged on a DN50 nitrogen main pipe of each coke oven and is far away from a fire source, and adopts a 220VAC power supply. The invention can be operated remotely, and can also be operated manually by one-key diffusion ignition on site at any time according to the requirement. The control system of the present invention includes 3 control modes. The specific control scheme is as follows:

(1) remote automatic control: the gas pressure PV 1-PV 4 of each section of gas collecting tube and the stop signal of the gas blower are used as detection signals. When any detected pressure PV exceeds a set value, corresponding parameters yellow and red flash, and the system sends out an alarm signal. When the pressure PV continues to rise and exceeds the limit set value SV1 or the stop signal of the blower is detected and kept for a period of time T1, the system outputs a forward rotation signal of the winch 1, simultaneously pulls the water seal valve 5 of the 4-section diffusing pipe 6 to diffuse raw gas, and stops the winch 1 after the raw gas is opened to limit or set for a period of time T2. When the winch 1 is pulled off, 4 ignition transformers 9 are triggered to start, the time is kept until the time delay time T3 is reached, or the thermocouple detection temperatures TE 1-TE 4 of the diffusing pipe 6 reach the set value SV2, the ignition is judged to be successful, and the ignition transformers 9 are stopped from discharging. After a delay time T4 seconds, the nitrogen solenoid valve 10 is opened to eliminate smoke. When the system detects the operation signal of the blower or 4 pressure detection values PV of each section of gas collecting tube 3 are smaller than a set value SV3, after the temperature is kept for T5 seconds, a reversing signal of the winch 1 is output, the water seal valve 5 is closed, and after the set time T6 or the closing limit returns, the operation of the winch 1 is stopped. When the detected temperature TE of each section of gas collecting tube 3 is smaller than the set value SV4 or the set time T7 is reached, the fire is judged to be extinguished, the nitrogen electromagnetic valve 10 is closed, and the automatic diffusing and igniting process is completed once.

(2) Remote manual: and monitoring a picture by using a manual signal instead of automatic detection at the upper computer, and triggering the starting and stopping of the ignition device. The winch 1 rotates forward by manually clicking on 'start', the water seal valve 5 of the diffusing pipe 6 is pulled open to diffuse raw gas, and the operation is stopped after the raw gas is limited or the set time T2 is reached. When the winch 1 pulls the water seal valve 5 open, 4 ignition transformers 9 are triggered to start, the time delay time T3 is reached, or the thermocouple detection temperatures TE 1-TE 4 of the diffusing pipe 6 reach the set value SV2, the ignition is judged to be successful, and the ignition transformers 9 are stopped from discharging. After a delay time T4 seconds, the nitrogen solenoid valve 10 is opened to eliminate smoke. When the release is required to be stopped, clicking the stop, outputting a signal to enable the winch 1 to reversely rotate, closing the water seal valve 5, and stopping the operation of the winch 1 after the set time T6 is up or the closing limit is returned. When the detected temperature TE of each section of gas collecting tube 3 is smaller than the set value SV4 or the set time T7 is reached, the fire is judged to be extinguished, the nitrogen electromagnetic valve 10 is closed, and the remote hand-diffusing ignition process is completed.

During remote operation, all the set values of the conditions can be set and adjusted in the configuration picture according to the process requirements. And the equipment state and parameter alarm in the control process are displayed in real time, and key parameters are recorded. All the equipment stops, and is judged by adopting two modes of signal detection and delay time, and the signal detection and the delay time are executed by the first arrival person, so that the equipment can not stop and is damaged when the system has detection faults.

(3) In situ manual: the operator's compartment is switched to "in situ" control on site. In order to simplify the operation and realize the fastest ignition, the field operation is designed into a one-key operation mode, namely: the ignition and water seal valve 5 is opened, and one key is operated simultaneously. In order to protect the ignition transformer 9, long-time discharge is prevented, equipment is damaged, the ignition device has no self-protection when in field operation, and the ignition device stops immediately after the successful field observation of ignition. The hoist 1 for opening and closing the water discharge seal valve 5 is stopped by the bidirectional travel limit switch 2 connected in series with the electric control loop. The start-stop control of the nitrogen electromagnetic valve 10 is realized by an independent button, and the start-up has a self-protection function. All control and operation of the ignition system are performed manually in situ, and the control and the operation of the ignition system are separated from the PLC control by the on-site operation box.

Example 2

The raw coke oven gas diffusing and igniting device shown in fig. 1, 2 and 4 comprises a diffusing pipe 6 communicated with a gas collecting pipe 3, a water sealing valve 5 is arranged at one end of the diffusing pipe 6 near the gas collecting pipe 3, an igniting unit is arranged at one side of the diffusing pipe 6 and arranged at the bottom end of one side of the diffusing pipe 6, the igniting unit comprises a pipeline 14, six fire guide holes 16 with diameter of phi 3 mm are axially arranged on the pipe wall at one side of the pipeline 14, the distance between the fire guide holes is 300mm, a fire guide groove 15 formed by bending flat steel is arranged at one side of the fire guide hole outside the pipeline, an igniting needle 7 is arranged at the outer side of the fire guide groove 15, the needle end of the igniting needle 7 extends into the fire guide groove 15, and the lower end of the pipeline 14 is connected with a clean gas pipeline through an electromagnetic valve 18.

When the PLC 12 detects that the pressure of the gas collecting tube 3 is abnormal and raw gas is to be diffused, the PLC 12 starts the ignition needle 7, simultaneously opens the electromagnetic valve 18, the clean gas controlled by the electromagnetic valve 18 is introduced from the bottom of the pipeline 14, the ignition needle 7 ignites the clean gas, flame rises to the top of the pipeline 14 along the flame guide groove 15, and the raw gas at the mouth of the pipe of the diffusion tube 6 is ignited. The remaining principle is the same as that of embodiment 1.

Claims

1. The utility model provides a coke oven raw gas diffuses and ignition, includes the diffusion pipe with the gas collecting pipe intercommunication the diffusion pipe is equipped with the water seal valve, the outside of diffusion pipe is close to the department of diffusing the mouth and is equipped with ignition unit, ignition unit is connected its characterized in that with ignition transformer: the water seal valve is connected with the winch, the diffusing pipe is positioned at the downstream of the water seal valve in the air flow direction and is communicated with a nitrogen pipeline, the nitrogen pipeline is provided with a nitrogen electromagnetic valve controlled by a controller, the diffusing port is provided with a temperature sensor for detecting the combustion state, and the gas collecting pipe is connected with a pressure transmitter; the controller receives signals of the temperature sensor and the pressure transmitter and controls the winch and the nitrogen electromagnetic valve;

the ignition unit consists of an ignition needle, an adjustor capable of adjusting the height distance and the angle direction of the ignition needle, a fixing piece and an ignition needle auxiliary electrical system; the fixing piece is made of an insulating porcelain bottle, a positioning bolt and a sleeve, the fixing piece is arranged on the outer side of the upper end of a pipe orifice of the diffusing pipe, the regulator is made of stainless steel, the top of the regulator is closed, a nut is welded on the lower part of the regulator, and the regulator is arranged on a connecting rod in a L shape; the ignition needle upper section passes through the sleeve of the fixing piece, then the lower end of the ignition needle upper section is welded to the top of the regulator, the tail end of the ignition needle lower section is provided with a stainless steel screw rod, and the ignition needle rotates through a connecting rod.

2. The raw coke oven gas diffusing and igniting device according to claim 1, wherein: the ignition units are two sets and are respectively arranged at two sides of the diffusing port of the same diffusing pipe.

3. The raw coke oven gas diffusing and igniting device according to claim 1, wherein: the four water seal valves of the four diffusing pipes are controlled by the same winch.

4. The raw coke oven gas diffusing and igniting device according to claim 1, wherein: the controller is a PLC controller.

5. A raw coke oven gas diffusing and igniting device is characterized in that: including the diffusion pipe with the gas collecting tube intercommunication the diffusion pipe is equipped with the water seal valve, the outside of diffusion pipe is close to the department of diffusing the mouth and is equipped with the ignition unit, the ignition unit is connected its characterized in that with ignition transformer: the water seal valve is connected with the winch, the diffusing pipe is positioned at the downstream of the water seal valve in the air flow direction and is communicated with a nitrogen pipeline, the nitrogen pipeline is provided with a nitrogen electromagnetic valve controlled by a controller, the diffusing port is provided with a temperature sensor for detecting the combustion state, and the gas collecting pipe is connected with a pressure transmitter; the controller receives signals of the temperature sensor and the pressure transmitter and controls the winch and the nitrogen electromagnetic valve;

the ignition unit comprises a pipeline, six fire guide holes are axially formed in the pipe wall at one side of the pipeline, a fire guide groove is formed in one side of the fire guide hole outside the pipeline, an ignition needle is arranged at the outer side of the fire guide groove, the needle end of the ignition needle extends into the fire guide groove, and an electromagnetic valve for controlling the input of combustible gas is connected to the lower end of the pipeline.