Fine desulfurization device with synergic desulfurization and carbon reduction

Abstract

The utility model discloses a fine desulfurization device with desulfurization cooperating with carbon reduction, and relates to the technical field of full-dry blast furnace gas fine desulfurization. The system comprises a temperature adjusting device, adsorption towers, a downstream workshop section and a waste gas centralized treatment center, adsorption inlets in the bottoms of the multiple adsorption towers are all connected with the temperature adjusting device, and adsorption outlets in the tops of the adsorption towers are all connected with a clean blast furnace gas pipe network; the clean blast furnace gas pipe network is connected with regeneration inlets in the tops of the adsorption towers through the induced draft fan, the heat exchanger and the electric heater in sequence; regeneration outlets in the bottoms of the adsorption towers are connected with the waste gas centralized treatment center. The regeneration process flow is simple in design, the electric valves are arranged on the adsorption route and the analysis route of the adsorption towers, the adsorption towers are automatically and alternately switched for regeneration, the regeneration time can be adjusted and set according to actual conditions, and according to pollutant removal conditions, interlocking control is carried out to ensure that adsorption and regeneration of the adsorption towers are alternately carried out; online adsorption and online regeneration are realized, and the removal efficiency is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of full-dry blast furnace gas fine desulfurization, and more specifically is a fine desulfurization device for desulfurization and coordinated carbon reduction. Background Art

[0002] The key to blast furnace gas desulfurization is the removal of organic sulfur, and the removal efficiency of existing domestic processes is not ideal. Sulfur in blast furnace gas can be divided into two categories: organic sulfur and inorganic sulfur. The main components of organic sulfur are: carbonyl sulfide (COS), carbon disulfide (CS2), methyl mercaptan (CH4S), ethyl mercaptan (C2H6S), thiophene (C4H4S), etc.; the main components of inorganic sulfur are: hydrogen sulfide (H2S), sulfur dioxide (SO2), etc.; the content of sulfur with different chemical components varies greatly, but they are all in the order of parts per million of coal gas; since most blast furnace gas is finally used by various means of combustion at this stage, the sulfur in the coal gas is eventually discharged into the atmosphere in the form of sulfur dioxide or sulfur trioxide; traditional gas purification technology can only effectively remove inorganic sulfur, namely H2S, so the main reason for the excessive end SO2 is the organic sulfur in the coal gas.

[0003] The current desulfurization process is divided into source control and end-of-pipe control; source control is to first remove organic sulfur and hydrogen sulfide from blast furnace gas; organic sulfur is relatively stable and difficult to remove directly by conventional methods, so the main difficulty in removing blast furnace gas lies in removing the organic sulfur component, which is generally removed after being converted into inorganic sulfur; the purified blast furnace gas is then burned, and the SO2 in its flue gas can meet the emission standards; end-of-pipe control is to remove SO2 from the flue gas after the blast furnace gas is burned so as to meet the emission standards; due to the problems of many gas-using occasions, large flue gas volume, scattered equipment, and scattered management in end-of-pipe control, environmental protection departments in various places encourage the implementation of source control of blast furnace gas, and implement fine desulfurization of gas before sending it to subsequent use points, which is convenient for centralized management and reduces the burden of end-of-pipe control.

[0004] Therefore, it is necessary to develop a source desulfurization treatment method that can remove sulfur in a centralized manner at the front-end process at one time, and a multi-tower parallel full dry desulfurization process to achieve a fine desulfurization device that can achieve synergistic desulfurization and carbon reduction. Summary of the invention

[0005] The purpose of the utility model is to overcome the shortcomings of the above-mentioned background technology and to provide a fine desulfurization device for desulfurization and carbon reduction.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a fine desulfurization device for desulfurization and carbon reduction, characterized in that: it includes a temperature regulating device, an adsorption tower, a downstream section, and a centralized waste gas treatment center, the adsorption inlets at the bottom of the multiple adsorption towers are connected to the temperature regulating device, and the adsorption outlets at the top of the adsorption towers are connected to the clean blast furnace gas pipeline network;

[0007] The clean blast furnace gas pipeline network is connected to the downstream section;

[0008] The clean blast furnace gas pipeline network is connected to the regeneration inlet at the top of the adsorption tower through the induced draft fan, the heat exchanger, and the electric heater in sequence, and the regeneration outlets at the bottom of the multiple adsorption towers are connected to the exhaust gas centralized treatment center;

[0009] The adsorption inlet of each adsorption tower is provided with a first electric valve, and the regeneration inlet of each adsorption tower is provided with a second electric valve;

[0010] When the first electric valve of the adsorption tower is opened, the second electric valve of the adsorption tower is closed, and the adsorption state is entered;

[0011] When the first electric valve of the adsorption tower is closed, the second electric valve of the adsorption tower is opened to enter the regeneration state;

[0012] The first electric valves and the second electric valves of the plurality of adsorption towers are interlocked and controlled, and the plurality of adsorption towers realize automatic switching of working conditions by switching the opening and closing of the first electric valves and the second electric valves.

[0013] In the above technical solution, each of the adsorption towers is filled with a porous adsorbent.

[0014] In the above technical solution, the multiple adsorption towers include a spare adsorption tower.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1) The regeneration process flow of the utility model is simple in design. Electric valves are set on the adsorption route and the analysis route of the adsorption tower. Each adsorption tower automatically switches to regeneration in turn. The regeneration time can be adjusted and set according to the actual situation. According to the removal of pollutants, interlocking control is performed to ensure that the adsorption and regeneration of the adsorption tower are carried out in turn, realizing online adsorption and online regeneration, and ensuring removal efficiency.

[0017] 2) The utility model adopts the full dry blast furnace gas fine desulfurization process technology to meet the ultra-low emission, ensure the normal operation of the blast furnace, and do not affect the TRT power generation efficiency of the blast furnace gas.

[0018] 3) The utility model can simultaneously adsorb organic sulfur and inorganic sulfur, hydrogen sulfide, carbonyl sulfide, and sulfur dioxide with high adsorption accuracy.

[0019] 4) The utility model reduces the corrosion of pipelines by the formation of hydrosulfuric acid after H2S in coal gas dissolves in coal gas condensate at the front end desulfurization, thereby improving the safety of coal gas transportation; the utility model removes sulfur in a centralized manner at the front end process at one time, which is convenient for SO2 emission control in the whole plant; if the sulfur removed at the front end is sent to the terminal desulfurization device in a centralized manner, the scale of desulfurization can be reduced (the amount of flue gas treated by desulfurization after combustion is 50% higher than that of flue gas treated by fine desulfurization before combustion), and only one terminal desulfurization device needs to be built, saving costs; if the sulfur removed at the front end is sent to the sulfur preparation system, the terminal treatment facilities can also be omitted; the utility model adopts a front desulfurization process, which is convenient for subsequent denitrification of flue gas, avoids the influence of SO2 on the denitrification catalyst, and can reduce the cost of using the catalyst.

[0020] 5) The adsorbent of the utility model can be recycled and reused after expiration. No secondary pollutants such as wastewater are generated during the entire use period. The adsorbent material can be recycled and regenerated. After the regeneration life expires, it belongs to general solid waste and can be treated, which saves energy and reduces consumption. While achieving fine desulfurization, the purpose of reducing pollution and carbon emissions is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model.

[0022] Among them, 1-temperature control device, 2-adsorption tower, 21-clean blast furnace gas pipeline network, 22-induced draft fan, 23-heat exchanger, 24-electric heater, 25-spare adsorption tower, 3-downstream section, 4-waste gas centralized treatment center, 51-first electric valve, 52-second electric valve. DETAILED DESCRIPTION

[0023] The following is a detailed description of the implementation of the utility model in conjunction with the accompanying drawings, but they do not constitute a limitation of the utility model and are only used as examples. At the same time, the advantages of the utility model will become clearer and easier to understand through the description.

[0024] The present invention proposes a fine desulfurization device for synergistic desulfurization and carbon reduction, which can remove sulfur in a centralized manner at the front-end process at one time, facilitate SO2 emission control in the entire plant, set up a multi-tower parallel process, always keep one tower in analytical regeneration, and operate efficiently to achieve the purpose of synergistic desulfurization and carbon reduction.

[0025] Referring to the attached drawings, it can be seen that: a fine desulfurization device for desulfurization and carbon reduction is characterized in that: it includes a temperature regulating device 1, an adsorption tower 2, a downstream section 3, and a waste gas centralized treatment center 4, and blast furnace gas enters the temperature regulating device 1; a plurality of the adsorption towers 2 are arranged in parallel, and the adsorption inlets at the bottom of the plurality of adsorption towers 2 are all connected to the temperature regulating device 1, and the adsorption outlets at the tops of the adsorption towers 2 are all connected to the clean blast furnace gas pipeline network 21;

[0026] The clean blast furnace gas pipeline network 21 is connected to the downstream section 3;

[0027] The clean blast furnace gas pipe network 21 is connected to the regeneration inlet at the top of the adsorption tower 2 through the induced draft fan 22, the heat exchanger 23, and the electric heater 24 in sequence, and the regeneration outlets at the bottom of the multiple adsorption towers 2 are all connected to the exhaust gas centralized treatment center 4;

[0028] The adsorption inlet of each adsorption tower 2 is provided with a first electric valve 51, and the regeneration inlet of each adsorption tower 2 is provided with a second electric valve 52;

[0029] When the first electric valve 51 of the adsorption tower 2 is opened, the second electric valve 52 of the adsorption tower 2 is closed, and the adsorption state is entered;

[0030] When the first electric valve 51 of the adsorption tower 2 is closed, the second electric valve 52 of the adsorption tower 2 is opened, and the regeneration state is entered;

[0031] The first electric valves 51 and the second electric valves 52 of the multiple adsorption towers 2 are interlocked and controlled. The multiple adsorption towers 2 automatically switch working conditions by switching the opening and closing of the first electric valves 51 and the second electric valves 52, so that adsorption and analysis can be carried out online at the same time, thereby improving adsorption efficiency.

[0032] Each of the adsorption towers 2 is filled with a porous adsorbent.

[0033] The plurality of adsorption towers 2 include a spare adsorption tower 25 to ensure removal efficiency.

[0034] In actual use, blast furnace gas enters the adsorption tower 2 through a pipeline after TRT power generation, adsorbs impurities such as sulfide, chloride ions and oil in the gas, and the purified and qualified gas after treatment enters the downstream section 3.

[0035] Each adsorption tower 2 is filled with a porous adsorbent, and a spare adsorption tower 25 is provided, which adopts a porous adsorption material with stable performance, high adsorption efficiency, large adsorption capacity and low price.

[0036] After the adsorption tower 2 reaches a certain degree of saturation, clean blast furnace gas is extracted from the clean blast furnace gas pipeline 21 as regeneration analysis gas, and the analysis gas is heated to about 180°C through the steam heat exchanger 23, and the adsorption saturated adsorption tower 2 is purged and regenerated. The regeneration process is divided into three processes: heating, insulation and cold blowing. The regeneration time of a single tower is about 60 hours.

[0037] Each adsorption tower 2 automatically switches to the regeneration mode in turn, and the regeneration time can be adjusted according to the actual situation. The first electric valve 51 is set for the adsorption route of the adsorption tower 2, and the second electric valve 52 is set for the desorption route. According to the pollutant removal situation, interlocking control is performed to ensure that multiple adsorption towers 2 take turns to adsorb and regenerate the adsorption towers, ensure stable operation while achieving fine desulfurization, regenerate online, improve operation efficiency, and improve desulfurization efficiency.

[0038] The adsorption tower 2 that is saturated to a certain extent is regenerated by the analytical gas. The analytical gas takes away the H2S and organic sulfur and other impurities in the adsorption tower 2 and is used as the fuel gas of the boiler. The boiler flue gas is sent to the sintering flue gas network of the steel plant through the pipeline and desulfurized by the desulfurization facilities of the sintering machine. Since the sulfur element in the analytical gas is burned into SO2, the SO2 content of the sintering flue gas will increase. The desulfurization capacity of the sintering machine needs to meet the corresponding removal amount to achieve standard emissions. The sulfur element in the analytical gas can also be recycled through the desulfurization facilities of the sintering process. The clean coal gas after fine desulfurization is extracted by the fan and heated as analytical gas.

[0039] Process equipment anti-corrosion, blast furnace gas contains a certain amount of water. When the blast furnace gas from the TRT outlet enters the adsorption tower 2, the temperature will gradually decrease, and condensed water will precipitate. Since the porous adsorption material adsorbs H2S and CL2, it is easy to dissolve in the condensed water to form acidic ions, which will corrode the tower. At the same time, considering that the temperature of the adsorption tower 2 regeneration process can reach about 180°C, the adsorption tower should use high temperature resistant anti-corrosion materials or coatings. Therefore, the internal parts of the adsorption tower 2 are made of stainless steel, and the adsorption tower 2 body is made of duplex stainless steel or carbon steel + inner wall coated with military anti-corrosion coatings.

[0040] Treatment of dust accumulation in the adsorption tower. After the blast furnace gas is treated by the blast furnace bag dust collector at the front end of the adsorption tower 2, the dust content under normal working conditions is <10mg / m 3 , and the regeneration of the adsorption tower 2 actually also has the effect of back-blowing the analytical gas, so under normal working conditions, the porous adsorption material will not be blocked by gas dust, causing increased resistance loss or even adsorption failure. If dust accumulates in the adsorption tower 2 after long-term operation, since the working cycle of a single adsorption tower 2 is much longer than the regeneration cycle, there is enough time to stop the adsorption tower 2, overhaul and clean it. The porous material is hydrophobic and can be washed from top to bottom with water to solve the dust accumulation problem.

[0041] Clean coal gas is extracted as analytical gas, and sent to the adsorption tower after heating. The porous adsorption material is easily decomposed by gas at about 180°C, and the adsorbed impurities such as H2S, organic sulfur and chlorine are released and carried away by the analytical gas. The analytical temperature is very important for the stable operation of the device. A boiler can be set up to use analytical gas as fuel, and the steam produced is used as a heat source to heat the analytical gas, and the surplus steam is supplied externally.

[0042] Example

[0043] Taking the 1080 cubic meter blast furnace as an example, there are two blast furnaces in the project. For comparison, #1 and #2 blast furnaces are equipped with different desulfurization treatment solutions.

[0044] Unit #1 adopts the terminal desulfurization method, and desulfurization is carried out at the end after burning the gas, mainly to remove sulfur dioxide; blast furnace gas is used in hot blast furnaces, sintering, heating furnaces and other gas points, which uses the calorific value of the gas itself of 700-800 kcal / cubic meter. The components with calorific value in the gas are mainly carbon monoxide (20-25%) and hydrogen (1%). While carbon monoxide, hydrogen and oxygen in the air undergo combustion and oxidation reactions, carbonyl sulfide, carbon disulfide and hydrogen sulfide in the gas also react with oxygen to generate sulfur dioxide. Therefore, the terminal product sulfur dioxide needs to be removed in the terminal desulfurization of blast furnace gas. The amount of gas processed by the end-stage desulfurization is not only the amount of gas actually produced by the blast furnace, but also the amount of air added. Taking a 1,080-cubic-meter blast furnace as an example, the amount of gas that needs to be processed per hour is 380,000 cubic meters (the blast furnace gas volume is 260,000 cubic meters / hour, the carbon monoxide and hydrogen content is 25%, the amount of air added is about 155,000 cubic meters / hour, and the oxygen content in the air is 21%). Compared with the front-end treatment, the amount of gas that needs to be processed has increased by 50%. At the same time, due to the dispersion of gas consumption points, the end-stage desulfurization requires the construction of a desulfurization device for each gas consumption point.

[0045] Unit #2 adopts the front-end fine desulfurization method of the utility model, and removes hydrogen sulfide, carbonyl sulfide, sulfur dioxide, etc. at the same time. The gas volume treated by the front-end desulfurization is the actual gas volume produced by the blast furnace. The blast furnace gas volume produced per hour is 240,000-260,000 cubic meters. Because it is centrally processed before the gas point, only one set of desulfurization equipment is needed. After adopting the fine desulfurization technical solution of the utility model, the front-end fine desulfurization, the waste gas after analysis and regeneration is sent to the sintering flue gas for unified treatment, and the desulfurization cost is reduced by 20%. There is no secondary pollutant such as wastewater in the process of implementing the fine desulfurization technology, which meets the ultra-low emission standards and achieves the purpose of reducing pollution and carbon.

[0046] Other parts not described belong to the prior art.

Claims

1. A fine desulfurization device for desulfurization and carbon reduction, characterized in that: It comprises a temperature regulating device (1), an adsorption tower (2), a downstream section (3), and a waste gas centralized treatment center (4), wherein blast furnace gas enters the temperature regulating device (1); a plurality of the adsorption towers (2) are arranged in parallel, the adsorption inlets at the bottom of the plurality of adsorption towers (2) are all connected to the temperature regulating device (1), and the adsorption outlets at the tops of the adsorption towers (2) are all connected to a clean blast furnace gas pipeline network (21); The clean blast furnace gas pipeline network (21) is connected to the downstream section (3); The clean blast furnace gas pipe network (21) is connected to the regeneration inlet at the top of the adsorption tower (2) through the induced draft fan (22), the heat exchanger (23), and the electric heater (24) in sequence, and the regeneration outlets at the bottom of the plurality of adsorption towers (2) are all connected to the exhaust gas centralized treatment center (4); The adsorption inlet of each adsorption tower (2) is provided with a first electric valve (51), and the regeneration inlet of each adsorption tower (2) is provided with a second electric valve (52); When the first electric valve (51) of the adsorption tower (2) is opened, the second electric valve (52) of the adsorption tower (2) is closed, and the adsorption state is entered; When the first electric valve (51) of the adsorption tower (2) is closed, the second electric valve (52) of the adsorption tower (2) is opened, and the regeneration state is entered; The first electric valves (51) and the second electric valves (52) of the plurality of adsorption towers (2) are interlocked and controlled, and the plurality of adsorption towers (2) automatically switch working conditions in turn by switching the opening and closing of the first electric valves (51) and the second electric valves (52).

2. A fine desulfurization device for desulfurization and carbon reduction according to claim 1, characterized in that: Each of the adsorption towers (2) is filled with a porous adsorbent.

3. A fine desulfurization device for desulfurization and carbon reduction according to claim 2, characterized in that: The plurality of adsorption towers (2) include a spare adsorption tower (25).

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