Method and device for wet desulphurization of blast furnace gas

Abstract

The invention relates to a blast furnace gas wet desulphurization method and device, and the method comprises the following steps: step S101, sequentially carrying out gravity dust removal and bag dust removal on blast furnace gas, so that the dust content of the blast furnace gas is reduced to 10 mg / m < 3 > or below; and S102, the blast furnace gas is fed into a turbine power generation device, power is generated through the turbine power generation device, the pressure of the blast furnace gas is reduced to the preset pressure, and the temperature of the blast furnace gas is reduced to the preset temperature. And S103, introducing the blast furnace gas into an absorption device, and carrying out absorption treatment on sulfides in a compound amine solution consisting of diethanol amine (DEA) and piperazine (PZ), wherein the total sulfur content of the absorbed blast furnace gas is reduced from the first concentration range to the target concentration range. According to the method, hydrogen sulfide and organic sulfur in the blast furnace gas are effectively removed through amine liquid absorption regeneration cycle, and the problems of high treatment cost, high difficulty and the like in a traditional desulfurization method are solved.

Description

Technical Field

[0001] The invention relates to the technical field of wet desulfurization, and in particular to a method and device for wet desulfurization of blast furnace gas. Background Art

[0002] In the steel production process, blast furnace gas is an important by-product, and the sulfides it contains are one of the main sources of pollution. The sulfides in blast furnace gas mainly exist in the form of organic sulfur (carbonyl sulfide (COS), carbon disulfide (CS2)) and inorganic sulfur (hydrogen sulfide (H2S)). In order to achieve the ultra-low emission goals of the steel industry, blast furnace gas needs to be effectively desulfurized. Traditional end-of-pipe desulfurization methods require large gas processing volumes, high investment, large floor space, and heavy maintenance. Therefore, front-end desulfurization technology has become a practical option.

[0003] In contrast, the use of an amine liquid absorption regeneration circulation system for blast furnace gas desulfurization has significant advantages: High-efficiency desulfurization: Amine liquid can efficiently absorb organic and inorganic sulfur in blast furnace gas, including COS, CS2, and H2S. Regeneration cycle: After the amine liquid absorbs the sulfide, the sulfide can be released through the regeneration device, and the amine liquid is restored to its initial state and can be recycled, greatly reducing operating costs. No waste liquid discharge: Unlike the traditional alkaline liquid method, the absorption regeneration system does not produce sodium sulfide waste liquid, avoiding the treatment problems of sodium sulfide and sodium thiosulfate, reducing environmental pollution and treatment costs. Safety and environmental protection: The sulfide released during the regeneration process can be centrally treated, improving the safety of the working environment and air quality.

[0004] Therefore, the present invention provides an efficient, environmentally friendly and economical blast furnace gas front-end wet desulfurization technology, which effectively removes hydrogen sulfide and organic sulfur in blast furnace gas by utilizing an amine liquid absorption regeneration circulation system, thereby solving many problems in traditional desulfurization methods. Summary of the invention

[0005] The main purpose of the present invention is to overcome the defects of the existing blast furnace gas wet desulfurization method and device, and to provide a new blast furnace gas wet desulfurization method and device. The technical problem to be solved is to use an amine liquid absorption regeneration circulation system to effectively remove hydrogen sulfide and organic sulfur in blast furnace gas, thereby solving many problems in traditional desulfurization methods, making it more suitable for practical use and having industrial utilization value.

[0006] The purpose of the present invention and the solution to the technical problem are achieved by adopting the following technical solutions.

[0007] Compared with the prior art, the present invention has obvious advantages and beneficial effects. From the above technical scheme, it can be seen that in order to achieve the above-mentioned invention purpose, the main technical contents of the present invention are as follows:

[0008] The present invention provides a blast furnace gas wet desulfurization method and device, comprising:

[0009] The blast furnace gas is subjected to gravity dust removal and bag dust removal in sequence to reduce the dust content of the blast furnace gas to 10 mg / m 3 the following;

[0010] Sending the blast furnace gas to a turbine power generation device, generating electricity through the turbine power generation device, so that the pressure of the blast furnace gas drops to a preset pressure and the temperature drops to a preset temperature;

[0011] The blast furnace gas is introduced into an absorption device to absorb sulfides using a composite amine liquid composed of diethanolamine (DEA) and piperazine (PZ). The total sulfur content of the absorbed blast furnace gas is reduced from a first concentration range to a target concentration range.

[0012] In an optional embodiment, the method further comprises: regenerating the composite amine solution after absorbing the sulfide;

[0013] The sulfides released during the regeneration process are treated into elemental sulfur or sulfur.

[0014] In an optional embodiment, the turbine power generation device is used to generate electricity, so that the pressure of blast furnace gas is reduced from 0.4MPa-0.5MPa to 0.05MPa-0.1MPa, and the temperature is reduced from 150℃-200℃ to 50℃-60℃.

[0015] In an optional embodiment, the mass ratio of diethanolamine (DEA) to piperazine (PZ) is 1:0.2-0.3.

[0016] In an optional embodiment, the composite amine solution is a solution formed by desalted water and amines, wherein the desalted water accounts for 30% wt-38% wt of the composite amine solution, and the absorption temperature is 40°C-50°C.

[0017] In an optional embodiment, the complex amine solution after absorbing sulfide is regenerated, comprising:

[0018] The composite amine liquid is heated to 100° C.-110° C. and decompressed at 35 kPa to release hydrogen sulfide and organic sulfur from the composite amine liquid, thereby achieving regeneration of the composite amine liquid.

[0019] In an optional embodiment, the sulfide released during the regeneration process is processed into elemental sulfur or sulfur, comprising:

[0020] The sulfide released during the regeneration process is oxidized with air at 200℃-210℃ to generate sulfur, or

[0021] Sulfide is subjected to pressure absorption reaction to generate sulfur.

[0022] In an optional embodiment, the sulfides in the blast furnace gas include organic sulfur and inorganic sulfur.

[0023] In an optional embodiment, the organic sulfur includes carbonyl sulfide and carbon disulfide, and the inorganic sulfur is hydrogen sulfide.

[0024] On the other hand, a blast furnace gas wet desulfurization device is provided, which uses any of the above-mentioned blast furnace gas wet desulfurization methods to perform desulfurization.

[0025] From the above, it can be seen that the present invention sequentially performs gravity dust removal and bag dust removal on blast furnace gas, so that the dust content of the blast furnace gas is reduced to 10 mg / m 3 The method comprises the following steps: sending the blast furnace gas to a turbine power generation device, generating electricity through the turbine power generation device, reducing the pressure of the blast furnace gas to a preset pressure, and reducing the temperature of the blast furnace gas to a preset temperature; introducing the blast furnace gas into an absorption device for absorbing sulfides using a composite amine liquid composed of diethanolamine (DEA) and piperazine (PZ), and reducing the total sulfur content of the absorbed blast furnace gas from a first concentration range to a target concentration range.

[0026] By means of the above technical solution, the blast furnace gas wet desulfurization method and device of the present invention have at least the following advantages:

[0027] The present invention sequentially performs gravity dust removal and bag dust removal on blast furnace gas to reduce the dust content of the blast furnace gas to 10 mg / m 3 The method comprises the following steps: sending blast furnace gas to a turbine power generation device, generating electricity through the turbine power generation device, reducing the pressure of the blast furnace gas to a preset pressure, and reducing the temperature of the blast furnace gas to a preset temperature; introducing the blast furnace gas into an absorption device, and performing sulfide absorption treatment using a composite amine liquid composed of diethanolamine (DEA) and piperazine (PZ), and reducing the total sulfur content of the absorbed blast furnace gas from a first concentration range to a target concentration range. The present invention utilizes an amine liquid absorption regeneration cycle to effectively remove hydrogen sulfide and organic sulfur from the blast furnace gas, thereby solving many problems in traditional desulfurization methods, such as high treatment cost and difficulty.

[0028] In summary, the special blast furnace gas wet desulfurization method and device of the present invention utilizes amine liquid absorption regeneration cycle to effectively remove hydrogen sulfide and organic sulfur in blast furnace gas, solving many problems in traditional desulfurization methods such as high processing cost and difficulty. It has many advantages and practical value mentioned above, and no similar design has been published or used in similar blast furnace gas wet desulfurization methods, so it is indeed innovative. It has great improvements in both the blast furnace gas wet desulfurization method and function, and has great progress in technology, and has produced easy-to-use and practical effects. It has improved multiple functions compared with the existing blast furnace gas wet desulfurization method, so it is more suitable for practical use and has wide industrial utilization value. It is truly a novel, progressive and practical new design.

[0029] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0030] The specific blast furnace gas wet desulfurization method of the present invention is given in detail by the following examples and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Attached Figure 1 A schematic flow chart of a blast furnace gas wet desulfurization method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation method, steps, structure, characteristics and effects of the wet desulfurization method of blast furnace gas proposed by the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0033] See also Figure 1 As shown, the wet desulfurization method of blast furnace gas according to a preferred embodiment of the present invention mainly includes the following steps: step S101, step S102 and step S103.

[0034] Step S101: Gravity dust removal and bag dust removal are performed on the blast furnace gas in sequence to reduce the dust content of the blast furnace gas to 10 mg / m 3 the following.

[0035] Step S102, sending the blast furnace gas to the turbine power generation device, generating electricity through the turbine power generation device, so that the pressure of the blast furnace gas drops to a preset pressure and the temperature drops to a preset temperature.

[0036] Step S103, introducing the blast furnace gas into an absorption device to absorb sulfides using a composite amine liquid composed of diethanolamine (DEA) and piperazine (PZ), and the total sulfur content of the blast furnace gas after absorption is reduced from the first concentration range to the target concentration range.

[0037] The method provided in the embodiment of the present invention reduces the dust content of the blast furnace gas to 10 mg / m 3 Next, the blast furnace gas is sent to a turbine power generation device, and power generation is performed by the turbine power generation device, so that the pressure of the blast furnace gas is reduced to a preset pressure, and the temperature is reduced to a preset temperature. Not only can the pressure and temperature of the blast furnace gas be reduced, but also the excess temperature and pressure can be used to generate electricity, thereby avoiding waste of resources. The blast furnace gas is sent to a turbine power generation device, and power generation is performed by the turbine power generation device, so that the pressure of the blast furnace gas is reduced to a preset pressure, and the temperature is reduced to a preset temperature. The blast furnace gas is introduced into an absorption device and sulfide absorption treatment is performed in a composite amine liquid composed of diethanolamine (DEA) and piperazine (PZ). The total sulfur content of the blast furnace gas after absorption is reduced from a first concentration range to a target concentration range, and hydrogen sulfide and organic sulfur in the blast furnace gas can be effectively removed, solving many problems in traditional desulfurization methods such as high processing cost and difficulty.

[0038] The wet desulfurization method for blast furnace gas provided by the embodiment of the present invention has the following beneficial effects:

[0039] Efficient desulfurization: Through optimized compound amine liquid formula and reasonable process parameter control, the sulfide in blast furnace gas can be effectively removed, reducing the total sulfur content in the gas to an extremely low level, meeting the environmental protection requirements of subsequent gas utilization.

[0040] Energy saving and consumption reduction: The use of turbine power generation equipment to recover the residual pressure energy of coal gas, and the use of heat exchangers and other equipment to achieve effective heat recovery and utilization, reduce the energy consumption of the entire desulfurization system and reduce energy waste.

[0041] Resource recovery: Converting sulfides into reusable substances such as elemental sulfur or sulfur achieves resource recovery and utilization, improves the economy of the entire desulfurization process, and is also in line with environmental protection concepts.

[0042] High system stability: The pretreatment device effectively removes particulate matter in the coal gas, reduces the blockage and wear of subsequent equipment, extends the service life of the equipment, and improves the operating stability and reliability of the entire desulfurization system.

[0043] Step S101: Gravity dust removal and bag dust removal are performed on the blast furnace gas in sequence to reduce the dust content of the blast furnace gas to 10 mg / m 3 the following.

[0044] Step S101 in the embodiment of the present invention involves pre-treatment of blast furnace gas: after the blast furnace gas comes out from the furnace top, it first passes through a gravity dust removal device and a bag dust removal device to reduce the dust content to 10 mg / m 3 The following is mainly to remove particulate matter in the coal gas and prevent clogging and wear of subsequent processing devices. Among them, the gravity dust removal device and the bag dust removal device are common devices in the field, and the embodiments of the present invention will not be elaborated in detail.

[0045] Step S102, send the blast furnace gas to the turbine power generation device, generate electricity through the turbine power generation device, and reduce the pressure of the blast furnace gas to a preset pressure and the temperature to a preset temperature. In an optional embodiment, the turbine power generation device generates electricity to reduce the pressure of the blast furnace gas from 0.4MPa-0.5MPa to 0.05MPa-0.1MPa, and the temperature from 150℃-200℃ to 50℃-60℃. For example, the pressure of the blast furnace gas can be reduced from 0.45MPa to 0.06MPa, and the temperature can be reduced from 180℃ to 51℃.

[0046] Step S102 in the embodiment of the present invention is to reduce the temperature and pressure of blast furnace gas by turbine power generation (TRT). The blast furnace gas pretreated in step S101 enters the turbine power generation device (TRT), and generates electricity using the pressure and temperature of the gas to improve energy efficiency. This step not only recovers part of the energy of the blast furnace gas, but also reduces the temperature of the gas, providing favorable conditions for subsequent desulfurization treatment. The gas pressure drops from 0.4MPa-0.5MPa to 0.05MPa-0.1MPa, and the temperature drops from 150℃-200℃ to 50℃-60℃. Exemplarily, the gas pressure drops from 0.5MPa to 0.1MPa, and the temperature drops from 200℃ to 60℃.

[0047] In the embodiment of the present invention, step S103 is the absorption of the desulfurizing agent, wherein the blast furnace gas is introduced into the absorption device and the sulfide is absorbed by the composite amine liquid composed of diethanolamine (DEA) and piperazine (PZ), and the total sulfur content of the blast furnace gas after absorption is reduced from the first concentration range to the target concentration range. In an optional embodiment, the mass ratio of diethanolamine (DEA) to piperazine (PZ) is 1:0.2-0.3.

[0048] For example, the mass ratio of diethanolamine (DEA) to piperazine (PZ) may be 1:0.2 or 1:0.3.

[0049] In an optional embodiment, the composite amine solution is a solution formed by desalted water and amines, wherein the desalted water accounts for 30%wt-40%wt of the composite amine solution, and the absorption temperature is 38°C-55°C.

[0050] Exemplarily, desalted water may account for 30% wt, 31% wt, 32% wt, 33% wt, 34% wt, 35% wt, 36% wt, 37% wt, 38% wt, 39% wt or 40% wt of the complex amine solution, and the absorption temperature may be 38°C, 39°C, 40°C, 45°C, 50°C or 55°C, etc.

[0051] In an optional embodiment, the method further includes: regenerating the composite amine liquid after absorbing the sulfide; and treating the sulfide released during the regeneration process into elemental sulfur or sulfur.

[0052] In an optional embodiment, the composite amine liquid after absorbing sulfide is regenerated, including: heating the composite amine liquid to 100°C-110°C and reducing the pressure at 35 kPa to release hydrogen sulfide and organic sulfur from the composite amine liquid to achieve regeneration of the composite amine liquid.

[0053] The sulfur-containing gas analyzed from the regeneration tower enters the oxidation reaction device, where it undergoes an oxidation reaction with air at a temperature of 200°C to generate sulfur, or generates reusable substances such as sulfur through a pressurized absorption reaction, thereby realizing the resource utilization of sulfides, reducing environmental pollution, and improving the economy of the entire desulfurization process.

[0054] In an optional embodiment, the sulfide released in the regeneration process is processed into elemental sulfur or sulfur, including: the sulfide released in the regeneration process is oxidized with air at 200°C-210°C to generate elemental sulfur, or the sulfide is pressurized to absorb and react to generate sulfur. In an optional embodiment, the sulfide in the blast furnace gas includes organic sulfur and inorganic sulfur. In an optional embodiment, the organic sulfur includes carbonyl sulfide and carbon disulfide, and the inorganic sulfur is hydrogen sulfide.

[0055] On the other hand, a blast furnace gas wet desulfurization device is provided, which uses any of the above-mentioned blast furnace gas wet desulfurization methods to perform desulfurization.

[0056] The wet desulfurization method for blast furnace gas provided by the embodiment of the present invention is suitable for low-pressure desulfurization scenarios, which solves the problem of the difficulty of traditional high-pressure desulfurization. At the same time, it does not require carbonyl sulfide hydrolysis, and directly removes sulfides with amine liquid, which is suitable for efficient removal of hydrogen sulfide under low-pressure conditions. The regeneration device can efficiently regenerate the absorption liquid, reduce operating costs and environmental pollution. Comprehensive pretreatment, turbine power generation, amine liquid direct desulfurization and subsequent hydrogen sulfide treatment and other multi-step processes ensure the high efficiency, environmental protection and economy of the blast furnace gas desulfurization process.

[0057] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for wet desulfurization of blast furnace gas, characterized in that: include: The blast furnace gas is subjected to gravity dust removal and bag dust removal in sequence to reduce the dust content of the blast furnace gas to 10 mg / m 3 the following; Sending the blast furnace gas to a turbine power generation device, generating electricity through the turbine power generation device, so that the pressure of the blast furnace gas drops to a preset pressure and the temperature drops to a preset temperature; The blast furnace gas is introduced into an absorption device to absorb sulfides using a composite amine liquid composed of diethanolamine (DEA) and piperazine (PZ). The total sulfur content of the absorbed blast furnace gas is reduced from a first concentration range to a target concentration range.

2. The method for wet desulfurization of blast furnace gas according to claim 1, characterized in that: Also includes: Regenerating the composite amine liquid after absorbing the sulfide; The sulfides released during the regeneration process are treated into elemental sulfur or sulfur.

3. The method for wet desulfurization of blast furnace gas according to claim 1, characterized in that: The turbine power generation device generates electricity, so that the pressure of blast furnace gas is reduced from 0.4MPa-0.5MPa to 0.05MPa-0.1MPa, and the temperature is reduced from 150℃-200℃ to 50℃-60℃.

4. The method for wet desulfurization of blast furnace gas according to claim 1, characterized in that: The mass ratio of diethanolamine (DEA) to piperazine (PZ) is 1:0.2-0.

3.

5. The method for wet desulfurization of blast furnace gas according to claim 1, characterized in that: The composite amine solution is a solution formed by desalted water and amines, wherein the desalted water accounts for 30%wt-38%wt of the composite amine solution, and the absorption temperature is 40°C-50°C.

6. The method for wet desulfurization of blast furnace gas according to claim 2, characterized in that: The regeneration process of the composite amine liquid after absorbing sulfide includes: The composite amine liquid is heated to 100° C.-110° C. and decompressed at 35 kPa to release hydrogen sulfide and organic sulfur from the composite amine liquid, thereby achieving regeneration of the composite amine liquid.

7. The method for wet desulfurization of blast furnace gas according to claim 2, characterized in that: The sulfides released during the regeneration process are processed into elemental sulfur or sulfur, including: The sulfide released during the regeneration process is oxidized with air at 200℃-210℃ to generate sulfur, or Sulfide is subjected to pressure absorption reaction to generate sulfur.

8. The method for wet desulfurization of blast furnace gas according to claim 1, characterized in that: The sulfides in the blast furnace gas include organic sulfur and inorganic sulfur.

9. The method for wet desulfurization of blast furnace gas according to claim 8, characterized in that: The organic sulfur includes carbonyl sulfide and carbon disulfide, and the inorganic sulfur is hydrogen sulfide.

10. A blast furnace gas wet desulfurization device, characterized in that: The blast furnace gas wet desulfurization device adopts the blast furnace gas wet desulfurization method described in any one of claims 1-9 to perform desulfurization.

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