阅读说明：本技术 一种高炉煤气精脱硫系统 (Blast furnace gas fine desulfurization system ) 是由 董映红 于 2021-01-16 设计创作，主要内容包括：本发明提供一种高炉煤气精脱硫系统,包括水解催化系统、H-2S脱除系统、工艺水循环系统、碱液供应系统、脱硫废水处理系统、重力除尘器、干法布袋除尘器。本发明可以有效地去除高炉煤气中的硫和氯,使高炉煤气燃烧后排放的烟气达到国家环保要求,同时也保护了煤气管网避免腐蚀更换,降低了企业运营成本。(The invention provides a blast furnace gas fine desulfurization system, which comprises a hydrolysis catalytic system and H 2 The system comprises an S removal system, a process water circulation system, an alkali liquor supply system, a desulfurization wastewater treatment system, a gravity dust collector and a dry bag dust collector. The invention can effectively remove sulfur and chlorine in the blast furnace gas, so that the flue gas discharged after the blast furnace gas is combusted meets the national environmental protection requirement, simultaneously, the invention also protects a gas pipe network from being corroded and replaced, and reduces the operation cost of enterprises.)

1. The blast furnace gas fine desulfurization system is characterized by comprising a hydrolysis catalytic system and H₂The system comprises an S removal system, a process water circulation system, an alkali liquor supply system, a desulfurization wastewater treatment system, a gravity dust collector and a dry bag dust collector.

2. The blast furnace gas fine desulfurization system according to claim 1, characterized in that the hydrolysis catalyst system consists of a blast furnace hydrolysis tower.

3. The blast furnace gas fine desulfurization system according to claim 1, wherein the H is₂The S removal system consists of a blast furnace gas desulfurization tower 1 and a blast furnace gas desulfurization tower 2.

4. The blast furnace gas fine desulfurization system according to claim 1, wherein the process water circulation system is composed of a clean water tank, a clean water circulation pump, a turbid water tank, a turbid water circulation shallow sand filter and a cooling tower device.

5. The blast furnace gas fine desulfurization system according to claim 1, wherein the lye supply system is composed of a lye tank, a lye discharge pump, a lye metering pump, and the like.

6. The blast furnace gas fine desulfurization system according to claim 1, wherein the desulfurization wastewater treatment system equipment comprises a dosing device, a reaction tank, a flocculation tank, a sedimentation tank, a filler, a stirrer, a sludge tank, a sludge pump and a plate-and-frame filter press.

Technical Field

The invention relates to the technical field of blast furnace gas desulfurization, in particular to a blast furnace gas fine desulfurization system.

Background

The blast furnace gas is a byproduct combustible gas in the blast furnace ironmaking production process, and has large yield and wide application; can be used as fuel for thermal equipment such as power plant boilers, hot blast stoves of iron works, heating furnaces of steel mills and the like. The main components of the blast furnace gas are CO, CO2, N2 and a small amount of sulfide and CL-, wherein the sulfide mainly comprises H2S and COS. If the coal gas generated in the blast furnace ironmaking process is not desulfurized and is directly used as the fuel of thermal equipment such as a power plant boiler, a hot blast stove of an ironmaking plant, a heating furnace of a steel rolling plant and the like, the emission of the flue gas of the equipment exceeds the standard, the SO2 content in the emitted flue gas is more than 50mg/m3, and the SO2 content in the flue gas emitted by some production plants is even more than 250mg/m 3.

Blast furnace gas is used as combustible gas with the largest output in iron and steel enterprises, and is purified and then sent to user units such as a blast furnace hot blast stove, a steel rolling heating furnace, gas power generation and the like to be used as fuel, but the blast furnace gas still contains harmful substances such as sulfur, chlorine and the like. With the promulgation of the 'opinion on the promotion and implementation of ultralow emission' of the steel industry (hereinafter referred to as 'opinion'), the steel industry formally enters the 'ultralow emission' era, users of blast furnace hot blast stoves, steel rolling heating furnaces, gas power generation and the like all require burning tail gas SO2 to reach the ultralow emission limit value, and the existing blast furnace gas purification process cannot meet the control requirement of SO 2.

In order to meet the national environmental protection requirements, various blast furnace gas users (such as power plants, iron plants and steel mills) are added with gas desulphurization equipment, however, the existing gas desulphurization equipment mainly removes sulfur, namely H, in blast furnace gas₂S, the sulfur in the blast furnace gas is mainly COS, SO for the blast furnace gas, the COS in the blast furnace gas cannot be removed even if a gas desulfurization device is added, and SO in the flue gas emission of the blast furnace gas₂The content of (A) still can not meet the national environmental protection requirement.

In addition, with the popularization of blast furnace gas dry dedusting, most of blast furnace gas of iron and steel enterprises in China adopts dry dedusting, the chlorine ions in the blast furnace gas subjected to dry dedusting exceed the standard, so that the corrosion of a gas pipe network is very serious, the gas pipeline of the iron and steel enterprises without dechlorination treatment is generally used for about 3 years, the gas pipeline is corroded and perforated to different degrees, the pipeline needs to be replaced for about 6 years, and great potential safety hazards are brought to the safety production of the enterprises. Because the general station main pipe of blast furnace gas pipeline does not have reserve pipeline or trip valve, change the house steward often and need the enterprise to stop production to change, seriously influence steel enterprise's normal production, cause huge potential safety hazard, change the pipeline simultaneously also greatly increased the manufacturing cost of enterprise.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a blast furnace gas fine desulfurization system.

In order to achieve the purpose, the invention adopts the following technical scheme:a blast furnace gas fine desulfurization system comprises a hydrolysis catalytic system and H₂The system comprises an S removal system, a process water circulation system, an alkali liquor supply system, a desulfurization wastewater treatment system, a gravity dust collector and a dry bag dust collector;

the hydrolysis catalytic system mainly comprises a blast furnace hydrolysis tower, and COS in sulfide in blast furnace gas is subjected to hydrolysis catalytic treatment by the blast furnace gas hydrolysis tower and is converted into H₂S is derived from H₂S, removing inorganic sulfur in the coal gas by using a removing system;

H₂the S removal system mainly comprises a blast furnace gas desulfurization tower 1 and a blast furnace gas desulfurization tower 2, wherein blast furnace gas after hydrolysis catalysis enters the blast furnace gas desulfurization tower 1 for H treatment after passing through a TRT/or pressure regulating valve bank₂The S is primarily removed and then enters a blast furnace gas desulfurization tower 2 for H₂Fine removal of S to obtain H₂S is converted into NaS, and the NaS is dissolved in water, so that COS and H in the blast furnace gas can be removed₂The purpose of S;

the process water circulating system mainly comprises a water purifying tank, a water purifying circulating pump, a turbid water tank, a turbid water circulating shallow sand filter, a water cooling tower and other equipment, soft water enters the water purifying tank from a water taking point, then enters a process water mixer from the water purifying tank, is mixed with alkali liquor in the mixer to form desulfurization process water, then enters a blast furnace gas desulfurization tower, and is subjected to chemical reaction with H2S in coal gas passing through the desulfurization tower in the desulfurization tower, and H is subjected to chemical reaction₂S is converted into NaS, the NaS is dissolved in water, then flows into a turbid water tank along with desulfurization process water from a drainage pipeline of a desulfurization tower, then enters a shallow sand filter from the turbid water tank for filtering, the filtered process water enters a water cooling tower for cooling, and finally enters a purified water tank from the water cooling tower, so that a closed loop circulation of the process water is realized;

the alkali liquor supply system mainly comprises an alkali liquor tank, an alkali liquor unloading pump, an alkali liquor metering pump and the like, wherein alkali liquor and an alkali liquor tank car are input into the alkali liquor tank through the alkali liquor unloading pump, the alkali liquor enters a process water mixer through the alkali liquor metering pump from the alkali liquor tank, and the alkali liquor and purified water from a purified water tank are mixed in the process water mixer to form desulfurization process water so as to realize the purpose of removing sulfur in blast furnace gasRemoving COS and H in blast furnace gas by using sulfur tower₂And (4) purpose of S.

The main equipment of the desulfurization wastewater treatment system comprises a dosing device, a reaction tank, a flocculation tank, a sedimentation tank, filler, a stirrer, a sludge tank, a sludge pump and a plate-and-frame filter press, wherein discharged fine desulfurization sewage is pumped to the reaction tank of the water treatment device through a sewage tank, a reagent is added into the reaction tank through a metering pump, the sewage enters the flocculation tank, the flocculating agent is added into the flocculation tank through the metering pump, the sewage enters the sedimentation tank, clear liquor on the sedimentation tank overflows into a clear water tank, and sludge precipitated in the sedimentation tank enters the sludge tank from a bottom conical hopper. The bottom of the sludge tank is provided with a slope-direction sludge outlet, sludge in the sludge tank is conveyed to a plate-and-frame filter press by a sludge pump, the plate-and-frame filter press is driven by hydraulic pressure, a pull plate trolley automatically unloads filter cakes, and filter press liquid is discharged outside.

A blast furnace gas fine desulfurization system comprises the following processes:

a. blast furnace gas is conveyed into a blast furnace gas hydrolysis tower after passing through a gravity dust collector and a dry cloth bag dust collector,

b. the COS in the blast furnace gas is hydrolyzed and converted into H by a blast furnace gas hydrolysis tower₂S；

c. The treated blast furnace gas is transmitted to a blast furnace gas desulfurization tower through a TRT/or a pressure regulating valve bank,

d. blast furnace gas desulfurizing tower for H in blast furnace gas₂S, Cl, carrying out desulfurization and dechlorination treatment;

e. the treated blast furnace gas is transmitted to a blast furnace gas user through a gas pipe network or stored in a gas tank.

Compared with the prior art, the invention has the advantages and positive effects that,

the invention can effectively remove sulfur and chlorine in the blast furnace gas, so that the flue gas discharged after the blast furnace gas is combusted meets the national environmental protection requirement, simultaneously, the invention also protects a gas pipe network from being corroded and replaced, and reduces the operation cost of enterprises.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments of the present disclosure.

Example 1

As shown in figure 1, the invention provides a blast furnace gas fine desulfurization system, which comprises a hydrolysis catalytic system and H₂The system comprises an S removal system, a process water circulation system, an alkali liquor supply system, a desulfurization wastewater treatment system, a gravity dust collector and a dry bag dust collector;

the hydrolysis catalytic system mainly comprises a blast furnace hydrolysis tower, and COS in sulfide in blast furnace gas is subjected to hydrolysis catalytic treatment by the blast furnace gas hydrolysis tower and is converted into H₂S is derived from H₂S, removing inorganic sulfur in the coal gas by using a removing system;

H₂the S removal system mainly comprises a blast furnace gas desulfurization tower 1 and a blast furnace gas desulfurization tower 2, wherein blast furnace gas after hydrolysis catalysis enters the blast furnace gas desulfurization tower 1 for H treatment after passing through a TRT/or pressure regulating valve bank₂The S is primarily removed and then enters a blast furnace gas desulfurization tower 2 for H₂Fine removal of S to obtain H₂S is converted into NaS, and the NaS is dissolved in water, so that COS and H in the blast furnace gas can be removed₂The purpose of S;

the process water circulating system mainly comprises a water purifying tank, a water purifying circulating pump, a turbid water tank, a turbid water circulating shallow sand filter, a water cooling tower and other equipment, soft water enters the water purifying tank from a water taking point, then enters a process water mixer from the water purifying tank, is mixed with alkali liquor in the mixer to form desulfurization process water, then enters a blast furnace gas desulfurization tower, and is subjected to chemical reaction with H2S in coal gas passing through the desulfurization tower in the desulfurization tower, and H is subjected to chemical reaction₂S is converted into NaS, and the NaS is dissolved in water and then is desulfurizedThe process water flows into the turbid water tank from a drainage pipeline of the desulfurizing tower, then enters the shallow sand filter from the turbid water tank for filtering, enters the water cooling tower for cooling after being filtered, and finally enters the purified water tank from the water cooling tower, so that closed-loop circulation of the process water is realized;

the alkali liquor supply system mainly comprises an alkali liquor tank, an alkali liquor unloading pump, an alkali liquor metering pump and the like, wherein alkali liquor and an alkali liquor tank car are input into the alkali liquor tank through the alkali liquor unloading pump, the alkali liquor enters a process water mixer through the alkali liquor metering pump from the alkali liquor tank, and the alkali liquor and purified water from a purified water tank are mixed in the process water mixer to form desulfurization process water so as to realize removal of COS and H in blast furnace gas in a blast furnace gas desulfurization tower₂And (4) purpose of S.

The main equipment of the desulfurization wastewater treatment system comprises a dosing device, a reaction tank, a flocculation tank, a sedimentation tank, filler, a stirrer, a sludge tank, a sludge pump and a plate-and-frame filter press, wherein discharged fine desulfurization sewage is pumped to the reaction tank of the water treatment device through a sewage tank, a reagent is added into the reaction tank through a metering pump, the sewage enters the flocculation tank, the flocculating agent is added into the flocculation tank through the metering pump, the sewage enters the sedimentation tank, clear liquor on the sedimentation tank overflows into a clear water tank, and sludge precipitated in the sedimentation tank enters the sludge tank from a bottom conical hopper. The bottom of the sludge tank is provided with a slope-direction sludge outlet, sludge in the sludge tank is conveyed to a plate-and-frame filter press by a sludge pump, the plate-and-frame filter press is driven by hydraulic pressure, a pull plate trolley automatically unloads filter cakes, and filter press liquid is discharged outside.

A blast furnace gas fine desulfurization system comprises the following processes:

a. blast furnace gas is conveyed into a blast furnace gas hydrolysis tower after passing through a gravity dust collector and a dry cloth bag dust collector,

b. the COS in the blast furnace gas is hydrolyzed and converted into H by a blast furnace gas hydrolysis tower₂S；

c. The treated blast furnace gas is transmitted to a blast furnace gas desulfurization tower through a TRT/or a pressure regulating valve bank,

d. blast furnace gas desulfurizing tower for H in blast furnace gas₂S, Cl, carrying out desulfurization and dechlorination treatment;

e. the treated blast furnace gas is transmitted to a blast furnace gas user through a gas pipe network or stored in a gas tank.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.