阅读说明：本技术 对煤气发生炉放散烟气进行除尘处理装置及工艺 (Device and process for dedusting flue gas emitted by gas producer ) 是由 苑卫军 李建胜 于 2019-10-08 设计创作，主要内容包括：本发明涉及环保技术领域,尤其是一种对煤气发生炉放散烟气进行除尘处理装置及工艺。循环油水收集池和循环水泵,煤气发生炉与钟罩阀连接,钟罩阀与静电除尘器的进气口连接,静电除尘器的顶端与自动点火放散火炬连接,静电除尘器的底端排水口与循环油水收集池连接,循环油水收集池通过循环水泵与静电除尘器的进水口连接。人工启动静电除尘器,使放散烟气通过钟罩阀进入静电除尘器；在线CO气体分析仪烟气进行取样,对烟气所含CO进行在线检测；关闭静电除尘器的同时关闭在线CO气体分析仪,开启钟罩阀上的意外超压放散装置进行检测。本发明能够有效降低粉尘颗粒物的排放,而且能够自动监测放散烟气的放散情况,保证了煤气发生炉的安全操作。(the invention relates to the technical field of environmental protection, in particular to a device and a process for dedusting flue gas emitted by a gas producer. The gas producer is connected with a bell valve, the bell valve is connected with an air inlet of an electrostatic dust collector, the top end of the electrostatic dust collector is connected with an automatic ignition diffusion torch, a water outlet at the bottom end of the electrostatic dust collector is connected with the circulating oil-water collecting pool, and the circulating oil-water collecting pool is connected with a water inlet of the electrostatic dust collector through the circulating water pump. Manually starting the electrostatic dust collector to enable the diffused flue gas to enter the electrostatic dust collector through a bell valve; sampling smoke of an online CO gas analyzer, and detecting CO contained in the smoke on line; and closing the electrostatic dust collector and the on-line CO gas analyzer at the same time, and opening an accidental overpressure relief device on the bell valve for detection. The invention can effectively reduce the emission of dust particles, can automatically monitor the diffusion condition of diffused flue gas, and ensures the safe operation of the gas producer.)

1. The utility model provides a flue gas is diffused to gas producer and is removed dust processing apparatus, includes gas producer, bell jar valve, electrostatic precipitator, and automatic ignition diffuses the torch, circulation profit catch pit and circulating water pump, gas producer and bell jar valve are connected, its characterized in that: the bell valve is connected with the air inlet of the electrostatic dust collector, the top end of the electrostatic dust collector is connected with the automatic ignition diffusion torch, the water outlet at the bottom end of the electrostatic dust collector is connected with the circulating oil-water collecting pool, and the circulating oil-water collecting pool is connected with the water inlet of the electrostatic dust collector through the circulating water pump.

2. the device for dedusting and processing the flue gas emitted by the gas producer according to claim 1, is characterized in that: the electrostatic dust collector is connected with the automatic ignition diffusion torch through a diffusion pipeline at the top end, a diffusion branch pipeline is arranged on the diffusion pipeline, and an online CO gas analyzer is arranged at the end part of the diffusion branch pipeline.

3. the device for dedusting and processing the flue gas emitted by the gas producer according to claim 1, is characterized in that: an accidental overpressure bleeding monitoring device is arranged on the bell valve.

4. The device for dedusting and processing the flue gas emitted by the gas producer according to claim 1, is characterized in that: a heater is arranged in the circulating oil-water collecting tank.

5. A process for carrying out dust removal treatment on flue gas emitted by a gas producer is characterized by comprising the following steps:

1) manually starting the electrostatic dust collector and the bell valve to enable the diffused flue gas to enter the electrostatic dust collector through the bell valve;

2) Starting an online CO gas analyzer, starting the online CO gas analyzer to sample the smoke gas after the electrostatic dust collector, carrying out online detection on CO contained in the smoke gas, starting an automatic ignition diffusion torch when the detected CO volume concentration reaches a detection set value, and igniting the diffusion torch;

3) starting a circulating water pump, conveying hot circulating water in the circulating oil-water collecting pool into the electrostatic precipitator by the circulating water pump, and carrying dust and/or tar in the electrostatic precipitator into the circulating oil-water collecting pool through water circulation;

4) And manually closing the bell valve and the electrostatic dust collector in sequence, closing the online CO gas analyzer while closing the electrostatic dust collector, delaying to stop the circulating water pump, and starting an accidental overpressure relief device on the bell valve for detection.

6. the process for dedusting flue gas generated by a gas producer according to claim 5, which is characterized in that: when the gas producer accidentally diffuses flue gas, the bell valve is automatically opened by means of the pressure of the flue gas, the electrostatic dust collector is automatically started after the accidental overpressure diffusion monitoring device on the bell valve detects accidental overpressure diffusion, the electrostatic dust collector is started according to the steps 1) to 4), and after the accidental overpressure diffusion accident treatment is completed, the accidental overpressure diffusion device is manually started to continue monitoring.

7. The process method for dedusting the flue gas emitted by the gas producer according to claim 5, is characterized in that: the temperature of oil and water in the circulating oil and water collecting pool is 50-55 ℃.

Technical Field

The invention relates to the technical field of environmental protection, in particular to a device and a process for dedusting flue gas emitted by a gas producer.

Background

with the increasing demand of industrial users, coal gasification technology has been developed to a certain extent. Although the coal gasification technology has a history of nearly one hundred years in China, the coal gasification technology is still relatively laggard and slow in development, and in general, the coal gasification technology in China is mainly based on the traditional technology, and the process of a coal gas producer is laggard, the environment-friendly facility is not sound, and the pollution is serious.

And (3) oven emission of flue gas: the two-section gas producer is provided with a dry distillation section of 5-6m, the dry distillation section is generally formed by building refractory bricks or pouring unshaped refractory materials, and before a new producer runs, the producer needs to be baked according to a set temperature rise curve. The oven-drying process of the gas producer lasts for 5-7 days generally, the oven-drying fuel generally adopts wood and coke (taking the gas producer with the diameter of 3.6m as an example, the oven-drying process generally needs 5000kg of wood and 1000kg of coke), the fume diffused by the oven at present is evacuated in a natural diffusion mode, a large amount of particles are discharged into the atmosphere along with the fume, and the surrounding environment is seriously polluted.

₂The method comprises the steps of firstly igniting by wood and then starting the furnace by coke in the early stage of the starting stage, wherein the emission characteristic of the emission waste gas of the generating furnace is similar to that of the furnace baking stage, the content of CO in the waste gas is gradually increased along with the continuation of the starting time, the content of CO is increased to a certain concentration (the volume concentration of CO is more than 20%), the consumption of wood in the stage of phi 3.6m of the generating furnace is about 1500kg, the consumption of coke is about 5000 kg. at present, the initial stage of the starting stage is mainly in a natural emission form of the smoke, in the later stage of the starting stage, when the content of CO in the waste gas is increased to be ignited (the color of the smoke is manually observed, when the color of the smoke is dense yellow, the torch is ignited to form the smoke, the emission smoke is high above the air after the emission of the smoke is ignited by the torch, the emission smoke in the early stage of the starting furnace is not subjected to dust removal treatment, and the smoke is not completely discharged to form the pollution.

And (3) carrying out diffusion at a reaction layer stage in the culture generator: after the starting stage is finished, the bituminous coal is added into the producer by a coal feeder, an oxidation layer and a reduction layer are cultured, when the oxygen content of the coal gas is tested to be less than 0.8% by sampling, a bleeding valve is closed to finish the coal gas bleeding, the gas is supplied to the coal gas purification area equipment, the bled coal gas in the reaction layer culturing stage is ignited at a bleeding port, and waste gas is discharged in a torch bleeding mode. The phi 3.6m producer consumes about 3000kg of coal at this stage. The diffused gas is ignited and diffused without being subjected to dust removal treatment, dust and tar fog drops carried by the gas are incompletely combusted to form a large amount of particles, and the environment is seriously polluted in the emission process.

And (3) heat standby diffusion of a generating furnace: when a power failure, equipment trouble shooting or intermittent production requirement occurs in a gas station, the gas producer needs to be switched into a hot standby state, and then is switched into an operating state from the hot standby state after the trouble is eliminated or when the gas producer is put into operation according to a plan. In the hot standby state, the water vapor gasifying agent is generally stopped, and the blower is turned to the low-load state to supply air to maintain the oxide layer in the furnace, or the blower is stopped, and the air is sucked by the natural suction valve by means of the suction force of the diffusing pipe to maintain the oxide layer in the furnace. The coal consumption of the coal gas producer with the diameter of 3.6m in the hot standby state is about 120-130 kg/h. The diffused gas in the hot standby stage is ignited and diffused without being subjected to dust removal treatment, dust and tar fog drops carried by the gas are incompletely combusted to form a large amount of particles, and the environment is seriously polluted in the emission process.

The method comprises the steps of stopping air supply when a gas producer is shut down, blowing a large amount of water vapor into a furnace bottom air inlet box to enable the temperature in the furnace to be reduced as soon as possible, wherein the furnace is subjected to endothermic reduction reaction, the reaction is continuously weakened along with the reduction of the furnace temperature until the furnace is stopped, the shutdown process generally lasts for a long time, generally lasts for 48H under the condition of sufficient water vapor, the tail gas generated by the producer is high in H ₂ and CO content and can be ignited in a torch emission mode, the H ₂ and the CO content are reduced along with the reduction of the furnace temperature, waste gas cannot be ignited, the waste gas cannot be ignited at the moment in a natural emission mode, the tail gas producer with the diameter of 3.6m consumes about 3000 plus 4000kg of coal when the shutdown is completed, the emitted gas is ignited and emitted without dust removal treatment in the early stage of the shutdown, dust and tar droplets carried by the gas are incompletely combusted to form a large amount of particles, the emission process seriously pollutes the environment, and the emitted gas is evacuated in the later stage of the natural emission.

Disclosure of Invention

In order to solve the defects of the technical problems, the invention provides a device and a process for dedusting flue gas emitted by a gas producer, which can effectively reduce the emission of particulate matters.

The device adopts the following technical scheme:

the utility model provides a to gas producer diffused flue gas processing apparatus that removes dust, includes gas producer, the bell jar valve, electrostatic precipitator, auto-ignition diffuses the torch, circulation profit collecting pit and circulating water pump, gas producer is connected with the bell jar valve, the bell jar valve is connected with electrostatic precipitator's air inlet, electrostatic precipitator's top and auto-ignition diffuse the torch and be connected, electrostatic precipitator's bottom outlet is connected with circulation profit collecting pit, circulation profit collecting pit passes through circulating water pump and is connected with electrostatic precipitator's water inlet.

Compared with the prior art, the invention has the beneficial effects that: the electrostatic dust collector is additionally arranged at the rear side of the bell jar valve to carry out dust (tar) removal treatment on the flue gas (coal gas) emitted by the coal gas generating furnace, thereby effectively reducing the particulate matter emission in the final flue gas emitted by the system and solving the problem of environmental pollution caused by the flue gas (coal gas) emitted by the coal gas release path.

further, the preferred scheme of the device is as follows:

The electrostatic dust collector is connected with the automatic ignition diffusion torch through a diffusion pipeline at the top end, a diffusion branch pipeline is arranged on the diffusion pipeline, and an online CO gas analyzer is arranged at the end part of the diffusion branch pipeline.

An accidental overpressure bleeding monitoring device is arranged on the bell valve.

a heater is arranged in the circulating oil-water collecting tank.

A method for carrying out dust removal treatment on flue gas emitted by a gas producer comprises the following steps:

1) Manually starting the electrostatic dust collector and the bell valve to enable the diffused flue gas to enter the electrostatic dust collector through the bell valve;

2) Starting an online CO gas analyzer, starting the online CO gas analyzer to sample the flue gas after the electrostatic dust collector, carrying out online detection on the CO contained in the flue gas, starting an automatic ignition diffusion torch when the volume concentration of the detected CO reaches a detection set value, and igniting the diffusion torch;

3) starting a circulating water pump, conveying hot circulating water in the circulating oil-water collecting pool into the electrostatic precipitator by the circulating water pump, and carrying dust and/or tar in the electrostatic precipitator into the circulating oil-water collecting pool through water circulation;

4) And manually closing the bell valve and the electrostatic dust collector in sequence, closing the online CO gas analyzer while closing the electrostatic dust collector, delaying to stop the circulating water pump, and starting an accidental overpressure relief device on the bell valve for detection.

Compared with the prior art, the method for dedusting the flue gas emitted by the gas producer has the beneficial effects that:

After the dust removal treatment, the diffused flue gas is ignited by an automatic ignition diffusion torch, so that the emission of particles generated by incomplete combustion of the coal gas with dust particles is effectively reduced; the circulating water pump can effectively ensure that the dust caught by the electrostatic dust collector is brought out in time, and the equipment is prevented from being blocked; the online CO gas analyzer can effectively ignite the diffused gas in time after the concentration of the diffused gas is reached, thereby reducing the diffusion time of CO and being beneficial to environmental protection; the accidental overpressure diffusion monitoring device monitors the diffused smoke without the producer at any time, can effectively ensure the safe operation of the gas producer, avoids the diffused smoke from being directly combusted without being filtered, and reduces the environmental pollution.

Further, the method for dedusting the flue gas emitted by the gas producer adopts the preferred scheme that:

When the gas producer accidentally diffuses flue gas, the bell valve is automatically opened by means of the pressure of the flue gas, the electrostatic dust collector is automatically started after the accidental overpressure diffusion monitoring device on the bell valve detects accidental overpressure diffusion, the electrostatic dust collector is started according to the steps 1) to 4), and after the accidental overpressure diffusion accident treatment is completed, the accidental overpressure diffusion device is manually started to continue monitoring.

The temperature of the oil water in the circulating oil water collecting pool is 50 ~ 55 ℃.

Drawings

FIG. 1 is a schematic structural view of the present invention;

In the figure: a gas producer 1; a bell jar valve 2; an electrostatic precipitator 3; an online CO gas analyzer 4; an auto-ignition diffusion torch 5; a circulating water pump 6; a circulating oil-water collecting tank 7; a heater 8; an accidental overpressure relief monitoring device 9; a flue gas duct 10; a blow-off line 11; the branch pipes 12 are diffused.

Detailed Description

the invention is further described below with reference to the accompanying drawings and specific embodiments.

Referring to the drawings:

A dust removal processing device for the diffused flue gas of a gas producer comprises the gas producer 1, a bell jar valve 2, an electrostatic dust collector 3, an automatic ignition diffusion torch 5, a circulating oil-water collecting tank 7, a circulating water pump 6 and the like, wherein the gas producer 1 is connected with the bell jar valve 2 through a flue gas pipeline 10, the bell jar valve 2 is provided with an accidental overpressure diffusion monitoring device 9, and the bell jar valve 2 is connected with an air inlet of the electrostatic dust collector 3 through the flue gas pipeline 10; the top end of the electrostatic dust collector 3 is connected with an automatic ignition diffusion torch 5 through a diffusion pipeline 11, a diffusion branch pipeline 12 is arranged on the diffusion pipeline 11, and the end part of the diffusion branch pipeline 12 is connected with an online CO gas analyzer 4; the water inlet at the bottom end of the electrostatic dust collector 3 is connected with a circulating oil-water collecting tank 7 through a circulating water pump 6, a water outlet at the bottom end of the electrostatic dust collector 3 is connected with the circulating oil-water collecting tank 7, and a heater 8 is arranged in the circulating oil-water collecting tank 7.

In this embodiment, when the gas producer 1 is planned to diffuse flue gas in the stages of oven drying, oven starting, fire bed culturing, standby heat diffusion and furnace shutdown, the process method for performing dust removal treatment on the diffused flue gas comprises the following steps:

the first step is as follows: firstly, the electrostatic dust collector 3 is manually started, and then the bell valve 2 is manually started, so that the diffused flue gas enters the electrostatic dust collector 3 from the gas producer 1 through the bell valve 2 for dust removal treatment.

The second step is that: after the electrostatic dust collector 3 is started, a starting signal is sent back to the PLC control system, the PLC control system automatically starts an online CO gas analyzer 4 (an analyzer of a four-square photoelectric member company, model: Gasboard-3100), the online CO gas analyzer 4 starts to sample the flue gas passing through the electrostatic dust collector 3, online detection is carried out on CO contained in the flue gas, and when the detected CO volume concentration reaches a detection set value of 14%, an automatic ignition diffusion torch 5 is started to ignite the diffusion torch.

The third step: after the electrostatic dust collector 3 is started, a starting signal is sent back to the PLC control system, the PLC control system automatically starts the circulating water pump 6, the circulating water pump 6 conveys hot circulating water heated to 55 ℃ in the circulating oil-water collecting pool 7 into the electrostatic dust collector 3, dust and tar in the electrostatic dust collector 3 are brought into the circulating oil-water collecting pool 7 through water circulation, and the coal gas producer 1 finishes the process of planned flue gas emission.

The fourth step: after the flue gas is diffused, the bell valve 2 is manually closed, then the electrostatic dust collector 3 is closed, meanwhile, the electrostatic dust collector 3 sends a closing signal to be fed back to the PLC control system, the PLC control system automatically stops the on-line CO gas analyzer 4, and the circulating water pump 6 is stopped after the PLC control system delays for 30s, and the accidental overpressure diffusing device 9 on the bell valve 2 is started for monitoring.

When the gas producer 1 has the condition of accidentally diffusing flue gas, the bell valve 2 is automatically opened by means of the pressure of the flue gas, after the accidental overpressure diffusion monitoring device 7 on the bell valve 2 detects accidental overpressure diffusion, a starting signal is sent and fed back to the PLC control system, the PLC control system automatically starts the electrostatic dust collector 3, the electrostatic dust collector 3 is started according to the steps from the first step to the fourth step, and after the accidental overpressure diffusion accident treatment is completed, the accidental overpressure diffusion device 9 is manually opened to continue monitoring.

According to the invention, the electrostatic dust collector 3 is arranged behind the middle bell valve 2, the dust removal treatment is carried out on the flue gas diffused by the gas producer 1, and the diffused flue gas is ignited by the automatic ignition diffusing torch 5 after the dust removal treatment, so that the particulate emission caused by incomplete combustion of dust particles carried by the gas is effectively reduced; when the gas station is planned to diffuse the flue gas, the gas station operator is fully prepared, the opening and closing of the bell jar valve 2 and the electrostatic dust collector 3 are controlled manually, when the accidental overpressure is diffused, the operator does not have any preparation, the opening of the electrostatic dust collector 3 is automatically controlled by sending an opening signal through the accidental overpressure diffusion monitoring device 9, after the accidental overpressure accident is processed, the bell jar valve 2 and the electrostatic dust collector 3 are closed manually, and the safe operation of the gas generating furnace is effectively ensured.

The on-line CO gas analyzer 4 is automatically controlled by signal feedback, so that the gas which does not pass through the electrostatic dust collector 3 directly enters the on-line CO gas analyzer 4 to damage the analyzer; the start and the stop of the circulating water pump 6 are controlled by signals sent by the electrostatic dust collector 3, so that dust captured by the electrostatic dust collector 3 is effectively carried out in time, and the equipment is prevented from being blocked; the starting of the automatic ignition diffusion torch 5 is controlled by the detection signal of the online CO gas analyzer 4, so that the timely ignition of the diffused gas can be effectively ensured, the diffusion time of CO is reduced, and the environmental protection is facilitated; when the gas producer 1 is accidentally over-pressure diffused, the opening of the electrostatic dust collector 3 is controlled by a signal sent by the accidental over-pressure diffusion monitoring device 9, so that the phenomenon of diffusion of particulate matters carried by flue gas caused by untimely opening of the electrostatic dust collector 3 is effectively avoided.

The electrostatic precipitator 3 in this embodiment is also capable of removing tar droplets present in the flue gas.

The above description is only for the specific embodiment of the present invention, but the protection of the present invention is not limited thereto, and all equivalent changes or substitutions to the technical features of the present invention that can be made by those skilled in the art are included in the protection scope of the present invention.