阅读说明：本技术 一种高炉煤气trt后脱硫设备及工艺 (Blast furnace gas TRT post-desulfurization equipment and process ) 是由 杨荣林 姜建飞 杨亮 于 2020-12-23 设计创作，主要内容包括：本申请涉及一种高炉煤气TRT后脱硫设备及工艺,高炉煤气TRT后脱硫设备包括保护反应器、水解反应器、湿法脱硫系统、抽气系统、检测控制装置,待处理煤气依次经过保护反应器、水解反应器、湿法脱硫系统并由抽气系统提供动力,脱硫废液经脱硫液循环装置输送至脱硫液再生装置处理形成单质硫泡沫和碳酸钠碱液,单质硫泡沫经压滤装置处理形成硫膏和压滤液,压滤液经脱硫液循环装置处理后与碳酸钠碱液混合在一起形成贫液并由脱硫液循环装置再度送入脱硫塔,检测装置用于检测脱硫设备参数,检测控制装置与抽气系统、脱硫液循环装置、压滤装置、检测装置均连接。本申请对TRT发电及高炉影响小、能源消耗低、节能环保、设备简单、工作环境友好,运行安全可靠。(The utility model relates to a desulfurization equipment and technology behind blast furnace gas TRT, desulfurization equipment behind blast furnace gas TRT includes the protection reactor, hydrolysis reactor, wet flue gas desulfurization system, gas exhaust system, detection controlling means, the coal gas that treats passes through the protection reactor in proper order, hydrolysis reactor, wet flue gas desulfurization system and provides power by gas exhaust system, desulfurization waste liquid is carried to doctor solution regenerating unit through doctor solution circulating device and is handled and form simple substance sulphur foam and sodium carbonate alkali lye, simple substance sulphur foam is handled through filter pressing device and is formed sulphur cream and pressure filtrate, pressure filtrate mixes together with sodium carbonate alkali lye after doctor solution circulating device handles and forms the barren liquor and send into the desulfurizing tower again by doctor solution circulating device, detection device is used for detecting the desulfurization equipment parameter, detection controlling means and gas exhaust system, doctor solution circulating device, filter pressing device, detection device all are connected. The application has the advantages of small influence on TRT power generation and the blast furnace, low energy consumption, energy conservation, environmental protection, simple equipment, friendly working environment and safe and reliable operation.)

1. A blast furnace gas TRT post-desulfurization device comprises a protection reactor, a hydrolysis reactor, a wet desulfurization system, an air exhaust system, a detection device and a control device, and is characterized in that an inlet of the protection reactor is connected with gas to be treated, the gas to be treated sequentially passes through a desulfurization tower and a gas-liquid separator of the protection reactor, the hydrolysis reactor and the wet desulfurization system, the air exhaust system provides gas movement power, the wet desulfurization system comprises a desulfurization solution regeneration device, a desulfurization solution circulation device and a filter pressing device, desulfurization waste liquid treated by the desulfurization tower is conveyed to the desulfurization solution regeneration device by the desulfurization solution circulation device to be treated to form elemental sulfur foam and sodium carbonate alkali liquid, the elemental sulfur foam is treated by the filter pressing device to form sulfur paste and filter pressing liquid, the filter pressing liquid is treated by the desulfurization solution circulation device and then is mixed with the sodium carbonate alkali liquid at the bottom of the desulfurization solution regeneration device to form barren liquid, and the barren liquid is conveyed to the desulfurization tower again by the desulfurization solution, the detection device is used for detecting parameters of the blast furnace gas TRT rear desulfurization equipment, and the control device is connected with the air extraction system, the desulfurization liquid circulating device, the filter pressing device and the detection device.

2. The blast furnace gas TRT post-desulfurization apparatus according to claim 1, characterized in that: the doctor solution circulating device comprises a rich solution pump, a barren solution pump, a supplement solution supply device, a waste solution tank, a rich solution pump is installed between a desulfurization tower outlet and a doctor solution regeneration device and used for conveying desulfurization waste solution, the barren solution pump is installed between a doctor solution regeneration device barren solution outlet and a desulfurization tower spray device and used for barren solution spraying and recycling, a supplement solution supply device outlet and a waste solution tank outlet are communicated to the bottom of the doctor solution regeneration device, a waste solution tank inlet is communicated with a filter pressing device filtrate outlet, and a control device is connected with the rich solution pump, the barren solution pump and the supplement solution supply device.

3. The blast furnace gas TRT post-desulfurization apparatus according to claim 1, characterized in that: the filter pressing device comprises a sulfur foam tank, a filter pressing pump and a filter press, elemental sulfur foam formed after the desulfurization liquid regeneration device is processed is conveyed to the sulfur foam tank to be precipitated, liquid elemental sulfur formed after the elemental sulfur foam is precipitated is conveyed to the filter press through the filter pressing pump to be subjected to filter pressing, an output port of the filter press comprises a filter pressing mud outlet and a filter pressing liquid outlet, the filter pressing liquid outlet is communicated to the desulfurization liquid circulation device, and the control device is connected with the filter pressing pump and the filter press.

4. The blast furnace gas TRT post-desulfurization apparatus according to claim 1, characterized in that: the protection reactor comprises a protection reactor body and a gas rectifier, wherein the gas rectifier comprises a flow deflector and a flow guide grid, the protection reactor body adopts a sealed cylinder type structure, the gas rectifier is arranged at the lower part in the protection reactor body, a protective agent is arranged above the gas rectifier, the inlet of the protection reactor is positioned below a gas rectifier bridge, and the outlet of the protection reactor is positioned at the upper part of the protection reactor body.

5. The blast furnace gas TRT post-desulfurization apparatus according to claim 1, characterized in that: the hydrolysis reactor comprises a hydrolysis reactor body and a catalyst tray, the catalyst tray is arranged in the hydrolysis reactor body, the catalyst tray is provided with hydrolysis catalysts, the inlet of the hydrolysis reactor is positioned at the lower part of the hydrolysis reactor body, and the outlet of the hydrolysis reactor is positioned at the upper part of the hydrolysis reactor body.

6. The blast furnace gas TRT post-desulfurization apparatus according to claim 1, characterized in that: the detection device comprises a hydrogen sulfide detector, and the hydrogen sulfide detector is arranged on an outlet pipeline of the gas-liquid separator.

7. The blast furnace gas TRT post-desulfurization apparatus according to claim 1, characterized in that: the control device adopts an industrial personal computer which is connected with the detection device through a TCP/IP Ethernet programmable logic control device.

8. The blast furnace gas TRT post-desulfurization process according to any one of claims 1 to 7, characterized by comprising the steps of:

s1: equipment initialization;

s2: firstly, operating a desulfurization solution circulating device, starting a spray in a desulfurization tower, and then starting a desulfurization solution regenerating device;

s3: opening a TRT rear gas main pipe connecting pipe valve and a follow-up equipment gas valve at the time of delaying the setting time after the normal operation of the desulfurization liquid circulating device, starting an induced draft fan, and entering a working mode:

s4: when the liquid level in the desulfurizing tower reaches a set liquid level, the liquid-rich pump sends the NaHS-containing alkali liquor to a desulfurizing liquid regeneration device, and oxidation sulfur separation reaction is carried out to generate elemental sulfur foam and sodium carbonate alkali liquor; allowing the elemental sulfur foam generated by the desulfurization solution regeneration device to automatically flow to a sulfur foam tank, precipitating to form liquid elemental sulfur, conveying the liquid elemental sulfur to a filter press through a filter press pump, and squeezing to generate sulfur paste; simultaneously, sodium carbonate alkali liquor generated by the desulfurization liquor regeneration device is mixed with the make-up liquor from the make-up liquor supply device and the waste liquor in the waste liquor tank, and the mixture is circulated to the spraying device in the desulfurization tower again through the barren liquor pump for spraying; and circularly executing the working mode until the work is finished, and shutting down the machine.

9. The blast furnace gas TRT post-desulfurization process according to claim 8, characterized in that: an orifice plate flowmeter is arranged at the inlet of the protective reactor, the control device is connected with the orifice plate flowmeter, and the flow rate of the barren liquor pump = the flue gas flow rate 30/1000+ micro-regulation amount detected by the orifice plate flowmeter;

fine adjustment = K (detected value of hydrogen sulfide detector at outlet of gas-liquid separator-target value of hydrogen sulfide) and fine adjustment is not less than 0 and not more than 10m, and K is coefficient.

10. The blast furnace gas TRT post-desulfurization process according to claim 8, characterized in that: the desulfurizing tower spray set includes two-layer shower, and electromagnetic flowmeter and pipeline governing valve are all established to every layer of shower, and electromagnetic flowmeter, pipeline governing valve all are connected with controlling means, examine through electromagnetic flowmeter, pipeline governing valve by controlling means and control the spray volume of upper shower 1.5~2.5 times of shower of lower floor, are provided with the packing layer between upper shower and the shower of lower floor.

Technical Field

The application relates to post-desulfurization equipment and a post-desulfurization process for blast furnace gas TRT (blast furnace gas excess pressure turbine power generation device).

Background

Blast furnace gas is a byproduct combustible gas in the blast furnace ironmaking production process. Its composition includes 6-12% of carbon dioxide, 25% of carbon monoxide, 1-4% of hydrogen, 55-60% of nitrogen and small quantity of carbonyl sulfide, hydrogen sulfide and carbon disulfide. The sulfur contained in the coal gas is mainly divided into organic sulfur and inorganic sulfur, wherein the organic sulfur mainly accounts for 3/4 and comprises carbonyl sulfur, carbon disulfide, thioether mercaptan, thiophene and the like; the inorganic sulfur accounts for about 1/4 and contains hydrogen sulfide, sulfur dioxide and the like as main components.

The blast furnace gas is mainly used as fuel gas at present, but a large amount of SO is generated after the blast furnace gas is used as the fuel gas for combustion₂The flue gas, if untreated, is discharged directly and does not meet the current environmental protection requirements. Three solutions of pollutant source emission reduction, process control and tail end treatment are considered and combed, and the currently feasible technical means include flue gas tail end treatment and blast furnace gas desulfurization at the source.

The gas pre-combustion desulfurization is a clean combustion technology which utilizes a desulfurizing agent to remove sulfide in the gas to generate clean gas which is then supplied to different departments for use. Because the gas is concentrated before combustion, only one set of desulfurization device is newly built for desulfurization before combustion to meet the requirement of sulfur dioxide emission.

At present, the hydrolysis section of the domestic coal gas desulfurization process before combustion adopts TRT to extract high-temperature high-pressure coal gas, and utilizes a high-temperature catalyst to hydrolyze organic sulfur. Due to the loss of the gas pressure and the heat energy of the hydrolysis section, the TRT generating capacity is relatively reduced when the TRT is returned to generate electricity, and the TRT top pressure is unstable, so that the condition of the blast furnace is influenced. The moisture content of the hydrolyzed coal gas is also increased, and the TRT corrosion risk is increased.

At present, no mature technology and process equipment suitable for removing carbonyl sulfide and the like in blast furnace gas in the steel industry exist in China. Under such circumstances, it is necessary to develop a technique and process equipment capable of effectively removing carbonyl sulfide and the like from blast furnace gas of iron and steel enterprises by studying the reaction characteristics of carbonyl sulfide and the like.

Disclosure of Invention

The technical problem solved by the application is to overcome the defects in the prior art, and provide the blast furnace gas TRT post-desulfurization equipment and the process which have the advantages of simple structure, small influence on TRT power generation and a blast furnace, low energy consumption, energy conservation, environmental protection, and safe and reliable operation.

The technical scheme adopted by the application for solving the technical problems comprises the following steps: a blast furnace gas TRT post-desulfurization device comprises a protection reactor, a hydrolysis reactor, a wet desulfurization system, an air exhaust system, a detection device and a control device, and is characterized in that an inlet of the protection reactor is connected with gas to be treated (from a TRT post-gas main pipe), the gas to be treated sequentially passes through a protection reactor, the hydrolysis reactor, a desulfurization tower and a gas-liquid separator of the wet desulfurization system, and the air exhaust system provides gas moving power, the wet desulfurization system comprises a desulfurization solution regeneration device, a desulfurization solution circulation device and a filter pressing device, the desulfurization tower is connected with the desulfurization solution regeneration device through the desulfurization solution circulation device, the desulfurization solution regeneration device is connected with the filter pressing device, the filter pressing device is connected with the desulfurization solution regeneration device through the desulfurization solution circulation device, desulfurization waste liquid treated by the desulfurization tower is conveyed to the desulfurization solution regeneration device through the desulfurization solution circulation device to form elemental sulfur foam and sodium carbonate, the simple substance sulfur foam is processed by a filter pressing device to form sulfur paste and filter pressing liquid, the filter pressing liquid is processed by a doctor solution circulating device and then is mixed with sodium carbonate alkali liquor at the bottom of a doctor solution regenerating device to form barren solution (liquid with the sulfur content meeting the requirement) and is sent into a desulfurizing tower again by the doctor solution circulating device for cyclic utilization, a detection device is used for detecting parameters of desulfurizing equipment after TRT of blast furnace gas, and a control device is connected with an air exhaust system, the doctor solution circulating device, the filter pressing device and the detection device and controls the operation of the devices.

The doctor solution circulating device comprises a rich solution pump, a barren solution pump, a supplement solution supply device, a waste solution tank, a rich solution pump is installed between a desulfurization tower outlet and a doctor solution regeneration device and used for conveying desulfurization waste solution, the barren solution pump is installed between a doctor solution regeneration device barren solution outlet and a desulfurization tower spray device and used for barren solution spraying and recycling, a supplement solution supply device outlet and a waste solution tank outlet are communicated to the bottom of the doctor solution regeneration device, a waste solution tank inlet is communicated with a filter pressing device filtrate outlet, and a controller is connected with the rich solution pump, the barren solution pump and the supplement solution supply device.

The filter pressing device comprises a sulfur foam tank, a filter pressing pump and a filter press, elemental sulfur foam formed after treatment of the desulfurization liquid regeneration device is conveyed to the sulfur foam tank for precipitation, liquid elemental sulfur formed after elemental sulfur foam precipitation is conveyed to the filter press through the filter pressing pump for filter pressing, an output port of the filter press comprises a filter pressing mud outlet and a filter pressing liquid outlet, the filter pressing liquid outlet is communicated to a waste liquid tank of the desulfurization liquid circulation device, the controller is connected with the filter pressing pump and the filter press, and a product of the filter pressing mud outlet is sulfur paste.

The protective reactor comprises a protective reactor body and a gas rectifier, the gas rectifier comprises a flow deflector and a flow guide grid, the protective reactor body adopts a sealed cylinder type structure, the gas rectifier is arranged at the lower part in the protective reactor body, a protective agent is arranged above the gas rectifier, the inlet of the protective reactor is positioned below a gas rectifier bridge, the outlet of the protective reactor is positioned at the upper part of the protective reactor body, and the gas can be conveniently and fully contacted and reacted, so that harmful substances such as CL in the gas^-Ions, oil-containing impurities and the like are sufficiently adsorbed and removed.

The hydrolysis reactor comprises a hydrolysis reactor body and a catalyst tray, the catalyst tray is arranged in the hydrolysis reactor body, the catalyst tray is provided with a hydrolysis catalyst, the inlet of the hydrolysis reactor is positioned at the lower part of the hydrolysis reactor body, the outlet of the hydrolysis reactor is positioned at the upper part of the hydrolysis reactor body, the hydrolysis catalyst adopts a high-efficiency normal-temperature normal-pressure catalyst, the requirement of the temperature of flue gas coming out of the TRT can be met, and the normal operation of the TRT is not influenced.

The detection device comprises a hydrogen sulfide detector which is arranged on an outlet pipeline of the gas-liquid separator and is used for detecting the sulfur content of the clean gas. The control device adopts an industrial personal computer which is connected with a detection device such as a hydrogen sulfide detector through a TCP/IP Ethernet programmable logic control device.

The technical scheme that this application solved above-mentioned technical problem and adopted still includes: a blast furnace gas TRT post-desulfurization process is characterized by comprising the following steps:

s1: equipment initialization;

s2: firstly, operating a desulfurization solution circulating device, starting a spray in a desulfurization tower, and then starting a desulfurization solution regenerating device;

s3: opening a TRT rear gas main pipe connecting pipe valve and a follow-up equipment gas valve at the time of delaying the setting time after the normal operation of the desulfurization liquid circulating device, starting an induced draft fan, and entering a working mode:

s4: when the liquid level in the desulfurizing tower reaches a set liquid level, the liquid-rich pump sends the NaHS-containing alkali liquor to a desulfurizing liquid regeneration device, and oxidation sulfur separation reaction is carried out to generate elemental sulfur foam and sodium carbonate alkali liquor; allowing the elemental sulfur foam generated by the desulfurization solution regeneration device to automatically flow to a sulfur foam tank, precipitating to form liquid elemental sulfur, conveying the liquid elemental sulfur to a filter press through a filter press pump, and squeezing to generate sulfur paste; simultaneously, sodium carbonate alkali liquor generated by the desulfurization liquor regeneration device is mixed with make-up liquor from a make-up liquor supply device and waste liquor tank liquid, and the mixture is circulated to a spraying device in the desulfurization tower again through a barren liquor pump for spraying; and circularly executing the working mode until the work is finished, and shutting down the machine.

This application protection reactor entry establishes the orifice plate flowmeter, and controlling means monitors flue gas flow through the orifice plate flowmeter, sets for the full load operating mode: and carrying out heavy harvest at the flue gas flow rate of 1000 m/h corresponding to the lean liquid pump flow rate of 30 m/h. The flow of the lean liquid pump is adjusted by adjusting the frequency of a motor of the lean liquid pump, and the flow of the lean liquid pump = the flow of the flue gas and 30/1000+ the fine adjustment amount.

Fine adjustment = K (detection value of gas-liquid separator outlet hydrogen sulfide detector-hydrogen sulfide target value 20 mg/Nm) and fine adjustment is not less than 0 and not more than 10 m/h, and K is a coefficient.

The liquid level meter at the bottom of the desulfurizing tower is configured to detect the liquid level at the bottom of the desulfurizing tower, the regenerating liquid level meter at the bottom of the desulfurizing liquid regenerating device is configured to monitor the liquid level at the bottom of the desulfurizing liquid regenerating device, the desulfurizing tower liquid level meter and the regenerating liquid level meter are respectively connected with the control device, the control device controls the liquid enrichment pump to start up and discharge liquid when the detection data of the desulfurizing tower liquid level meter reaches the set liquid level (indicating the position of the desulfurizing tower requiring liquid discharge) of the desulfurizing tower, and the control device controls the liquid enrichment pump to stop and discharge liquid when the detection data of the desulfurizing tower liquid level meter is lower than the set liquid level (indicating the position of the desulfurizing tower requiring no liquid discharge; the control device controls the barren pump to start draining when the detection data of the regeneration liquid level meter reaches the set draining liquid level of the desulfurization liquid regeneration device (indicating the position of the desulfurization liquid regeneration device for setting the draining liquid), and controls the barren pump to stop draining when the detection data of the desulfurization tower liquid level meter is lower than the set draining stop liquid level of the desulfurization liquid regeneration device (indicating the position of the desulfurization liquid regeneration device for setting the draining liquid not required).

This application desulfurizing tower spray set includes two-layer shower, and electromagnetic flowmeter and pipeline governing valve are all established to every layer of shower, and electromagnetic flowmeter, pipeline governing valve all are connected with controlling means, detect the proportion of controlling upper shower and lower floor's shower spraying volume by controlling means through electromagnetic flowmeter, pipeline governing valve, and this proportion optimum range is 1.5~2.5 times, is provided with the packing layer between upper shower and the lower floor's shower.

Compared with the prior art, the method has the following advantages: the method has the advantages of small influence on TRT power generation and a blast furnace, low energy consumption, energy conservation, environmental protection, simple equipment, friendly working environment and safe and reliable operation.

Drawings

Fig. 1 is a schematic diagram of an embodiment of the present application.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings by way of examples, which are illustrative of the present application and are not limited to the following examples. The front and back are described herein with respect to the process direction.

Referring to fig. 1, in the embodiment, a blast furnace gas TRT post-desulfurization process is adopted, and raw gas is introduced from normal-temperature normal-pressure gas of a gas main at the rear end of a TRT residual pressure turbine power generation device. The blast furnace gas TRT post-desulfurization equipment comprises a protection reactor 1, a hydrolysis reactor 2, a wet desulfurization system 3, an air exhaust system 4 and a control device, wherein the protection reactor 1, the hydrolysis reactor 2 and the wet desulfurization system 3 are sequentially connected through an air exhaust pipeline of the air exhaust system 4.

The protection reactor 1 comprises a protection reactor body 11, a gas rectifier 12 and a protective agent 13.

The hydrolysis reactor 2 comprises a hydrolysis reactor body, a catalyst tray and a hydrolysis catalyst.

The wet desulfurization system 3 includes a desulfurization tower 31, a gas-liquid separator 32, a desulfurization solution regeneration device (spray regeneration tank) 33, a desulfurization solution circulation device (a pregnant solution pump 34, a barren solution pump 35, a caustic bath 36, a waste solution tank 37, and the like), and a filter press device (a sulfur foam tank 38, a filter press pump 39, a filter press 30).

The air extraction system 4 comprises a TRT rear gas pipeline, a valve system and an induced draft fan.

The protection reactor body 11 is internally provided with a gas rectifier 12, the gas rectifier 12 comprises a flow deflector 121 and a flow guide grid 122, and the protective agent comprises a gas dechlorinating agent, a degreasing agent and an adsorbent. The internal guide vanes 121 of the gas rectifier are in a baffle plate type, and the initial flue gas flow is collided, cut and uniformly distributed through the baffle plate. The flue gas flow is uniformly distributed by the baffle plate and then enters the uniform distribution type guide grid 122 to be uniformly distributed again, so that the gas flow can be uniformly distributed in the channel, and the protective agent is ensured to be fully contacted and reacted with the gas, so that harmful substances such as CL in the coal gas^-Ions, oil-containing impurities and the like are fully adsorbed and removed, and the activity of the rear-end hydrolysis catalyst is ensured.

The temperature in the hydrolysis reactor 2 is below 90 ℃ and the pressure is 10-50 KPa.

The control device adopts an industrial personal computer as a monitoring operation workstation, and collects all real-time field analog quantity and switching value data through the TCP/IP Ethernet programmable logic control device and the detection device, so as to realize the remote control and operation of all equipment.

The application protects the inlet of the reactor 1 and the rear end of the gas-liquid separator 32 from being provided with hydrogen sulfide (H)₂S) a detector for monitoring the content of hydrogen sulfide in real time;

the orifice plate flowmeter is established to 1 entry of protection reactor, monitors flue gas flow, adjusts barren liquor pump 35 motor frequency according to flue gas flow for: barren pump flow = flue gas flow 30/1000+ fine tuning amount.

Fine adjustment = K (gas-liquid separator 32 export hydrogen sulfide detector a real-time detection value-hydrogen sulfide target value 20 mg/Nm) and neither less than 0 (i.e. fine adjustment value 0 when being less than 0) nor greater than 10m cultivation/h (i.e. value 10m cultivation/h when being greater than 10m cultivation/h), K value obtains according to actual system and according to current control theory experiment, also can divide into four grades with the difference result of hydrogen sulfide detector detection value-hydrogen sulfide target value, wherein:

taking a value of 0 in a fine adjustment manner when the difference value is not more than 0 mg/Nm;

performing the fine tuning measurement for a value of 3 m/h when the difference value is less than 5mg/Nm,

performing micro-regulation quantity taking 5m high yield and high yield when the difference value is less than 10mg/Nm for heavy plantation at 5 mg/Nm;

and when the difference value is larger than 10mg/Nm, carrying out fine adjustment and measurement on the obtained value for 10 m/h, and carrying out segmented control according to actual difference value adjustment. The fine adjustment amount can be corrected according to the actual operation condition.

Liquid level meters are arranged at the bottoms of the desulfurizing tower 31 and the desulfurizing liquid regenerating device 33, liquid levels are monitored, and the start and stop of the pregnant solution pump 34 and the start and stop of the barren solution pump 35 are respectively controlled in a linkage manner;

each layer (shown in fig. 1, the embodiment has two layers) of spray pipes 312 of the desulfurizing tower 31 is provided with an electromagnetic flowmeter and a pipeline regulating valve, the flow rate of the pipeline is monitored, the spray amount of each layer is controlled, the spray amount of the upper layer spray pipe is 1.5-2.5 times that of the lower layer spray pipe in the embodiment, a packing layer 313 is arranged between the upper layer spray pipe and the lower layer spray pipe, and the filtering effect of the packing layer is improved by properly improving the spray proportion of the upper layer spray pipe;

a pressure transmitter (not shown in the figure) is arranged at the outlet of the filter pressing pump 39, the pressure of the pipeline of the filter pressing device is monitored, and the feeding of the filter pressing pump 39 is controlled;

other pressure meters can be arranged to monitor the pressure value and the running state of the equipment.

The working steps of the blast furnace gas TRT post-desulfurization equipment of the embodiment are as follows:

initializing equipment, wherein each pipeline, each system and each valve are in a set initial state;

firstly, operating a desulfurization solution circulating device, starting a spray in the desulfurizing tower 31, and then starting a desulfurization solution regenerating device;

after the desulfurization liquid circulating device normally operates, delaying for a set time (for example, 5min, adjustable), opening a connecting pipe valve 41 of a gas main pipe after TRT and a gas valve (clean gas inlet end valve) of subsequent equipment, starting an induced draft fan 321, and entering a working mode; returning the treated clean coal gas to a coal gas main pipe and going to each gas point;

when the liquid level in the desulfurizing tower reaches a set liquid level (adjustable), the rich liquid pump 34 sends the NaHS-containing alkali liquor to a desulfurizing liquid regeneration device 33, and oxidation sulfur separation reaction is carried out to generate elemental sulfur foam and sodium carbonate alkali liquor; meanwhile, elemental sulfur foam generated by the desulfurization solution regeneration device 33 automatically flows to a sulfur foam tank 38, and liquid elemental sulfur with high water content is formed after precipitation and is conveyed to a filter press 30 through a filter press pump 39 to be pressed to form sulfur paste with low water content; at the same time, the sodium carbonate lye generated by the regeneration device 33 is mixed with the make-up solution from the alkali-melting tank (make-up solution supply device) 36 and the waste liquid tank 37, and then is circulated again to the spray device 311 in the desulfurizing tower 31 by the barren liquor pump 35 for spraying.

The states of the devices and the parameters of liquid and gas are collected and collected to the control device through the detection sensors, and the control device controls the devices to realize automatic operation and unattended operation.

The application can convert carbonyl sulfide and other sulfides into hydrogen sulfide and wet-process removal of hydrogen sulfide, and does not influence TRT and blast furnace operation. By adopting a new technology of desulfurization after TRT of blast furnace gas, the problem that sulfur dioxide in the flue gas of a user exceeds the standard is solved from the source, and the sulfur-containing gas is changed into clean energy.

The technical scheme of the application has the advantages that:

(1) the smoke is extracted after the TRT, and the TRT power generation and front-end equipment are not influenced.

This application adopts and draws coal gas behind the TRT, utilizes normal atmospheric temperature catalyst hydrolysis organic sulfur. The desulfurized coal gas directly enters various gas points, and the front-end TRT is not influenced. The TRT power generation loss and the coal gas erosion are avoided.

(2) Greatly reducing treatment gas amount of pre-combustion desulfurization and flue gas desulfurization

1 part of blast furnace gas is actually combusted, and the generated flue gas amount is 1.65 parts of blast furnace gas amount.

Therefore, the gas amount of the blast furnace gas subjected to the pre-combustion desulfurization treatment is only 1/1.65=0.6 of the flue gas amount after combustion;

namely: the gas amount of the treated coal gas is only 60 percent of the flue gas treatment amount, and the gas amount of the desulfurization treatment before combustion is greatly reduced, so that the emission requirement can be met.

(3) Investment reduction of pre-combustion desulfurization and flue gas desulfurization treatment equipment

The main equipment for blast furnace gas desulfurization is a hydrolysis tower, a desulfurization tower and a regeneration tower, and the process requirements can be met by adopting common carbon steel for corrosion prevention due to low water content of the gas and low corrosion of the equipment, and the investment for desulfurization before combustion is estimated to be about 50 percent of that of desulfurization after combustion.

(4) Low running cost

The coal gas pre-combustion desulfurization equipment is mainly static equipment, so that no special maintenance is needed in the operation process, only the catalyst needs to be replaced once a year, and the operation cost is 0.03 yuan/km³About coal gas.

For flue gas desulfurization after combustion, special personnel are needed to operate and maintain the equipment, and the equipment failure rate is high. Meanwhile, the corrosion of the equipment is high, the system needs to consider the anti-corrosion measures, and the operation cost is 0.3 yuan/km³About the flue gas.

(5) Occupies less area

For the desulfurization of the pre-combustion coal gas, the occupied area of equipment is small, and the equipment mainly occupies a hydrolysis tower, a desulfurization tower, a regeneration tower and the like. And the flue gas desulfurization needs to arrange a desulfurizing tower, a desulfurizing agent circulating system, dust removal, desulfurized ash storage and recovery and the like, so that the occupied area is large, and the occupied area is preliminarily estimated to be at least 2.5 times of that of coal gas desulfurization.

(6) Reducing secondary pollution

For pre-combustion gas desulfurization, the main secondary pollution is the treatment of the spent catalyst. The waste catalyst contains noble metal, so that the catalyst manufacturer can recover and utilize the catalyst, and the main by-product of the wet hydrogen sulfide removing process is sulfur paste.

For flue gas desulfurization after combustion, the main secondary pollutant desulfurized fly ash is difficult to be secondarily utilized due to high calcium sulfite content, and needs to be treated as solid waste, so that the cost in the operation process is increased.

In view of all aspects, the desulfurization after the TRT of the blast furnace gas is a preferred method for solving the problem that the sulfur dioxide of a blast furnace gas user exceeds the standard.

All simple variations and combinations of the technical features and technical solutions of the present application are considered to fall within the scope of the present application.