Dry-method blast furnace gas desulfurization multifunctional treatment tower

Abstract

The invention discloses a multifunctional treatment tower for dry-process blast furnace gas desulfurization. Comprising a tower body shell; more than one purification function unit is arranged in the tower body shell; a temperature sensor and an electric heater and / or an electric refrigerator are arranged in each purification function unit; and the automatic temperature control system is used for controlling the output power of the electric heater and / or the electric refrigerator according to the temperature sensor. The treatment tower integrated with a multifunctional module is adopted, a plurality of functional units are integrated in a single treatment tower, a plurality of physical and chemical processes such as deacidification, hydrolysis, desulfurization and dust removal of the blast furnace gas can be realized at the same time under the condition that only a single-stage treatment tower is arranged, and compared with the prior art, the number of the treatment towers is greatly reduced; the problems that an existing blast furnace gas purification treatment tower is single in function, needs to be provided with a multi-stage treatment tower, and is large in occupied area, high in initial investment and large in system resistance are solved.

Description

Technical Field

[0001] This invention relates to a multi-functional desulfurization treatment tower for dry blast furnace gas. Background Technology

[0002] According to the relevant provisions of the Ministry of Ecology and Environment's document "Opinions on Promoting the Implementation of Ultra-Low Emissions in the Iron and Steel Industry" (Environmental and Environmental Protection Department Document No. 35

[2019] ), fine desulfurization of blast furnace gas has become a mandatory requirement for ultra-low emission retrofitting. Sulfur-containing substances in blast furnace gas are mainly divided into organic sulfur and inorganic sulfur. Currently, the mainstream technical solution for fine desulfurization of blast furnace gas is as follows: First, the blast furnace gas undergoes hydrolysis to convert the organic sulfur in the gas into inorganic sulfur; then, inorganic sulfur is removed using various desulfurizing agents through adsorption. To achieve the above reaction process, a treatment tower is needed as a reaction vessel to provide space for various physicochemical reactions.

[0003] Existing gas purification towers generally have the following drawbacks: (1) Single function. A single tower can only realize one function in the blast furnace gas desulfurization process. In order to realize functions such as acid removal, hydrolysis, adsorption, and dust removal, multiple adsorption towers need to be set up, which results in high initial investment and large footprint. (2) Unable to control the reaction temperature. Hydrolysis conversion reaction and adsorption reaction require different reaction temperatures to proceed. However, the temperature of blast furnace gas is often fluctuated due to the influence of upstream processes, which has a significant impact on the hydrolysis conversion rate and adsorption efficiency, causing the purification system to malfunction. Summary of the Invention

[0004] To overcome the above-mentioned defects, the purpose of this invention is to provide a multi-functional desulfurization treatment tower for dry blast furnace gas.

[0005] To achieve the above objectives, the present invention provides a multi-functional dry blast furnace gas desulfurization treatment tower. Tower shell; One or more purification function units are provided inside the outer shell of the tower body; Each purification unit is equipped with a temperature sensor, as well as an electric heater and / or an electric cooler; Automatic temperature control system. This invention employs an automatic temperature control system to control the output power of the electric heater and / or electric cooler based on a temperature sensor.

[0006] Furthermore, the purification functional unit includes: a coal gas deacidification unit, a coal gas hydrolysis unit, a coal gas desulfurization unit, and a coal gas dust removal unit.

[0007] Furthermore, the purification functional unit includes, from bottom to top, a gas desulfurization unit, a gas hydrolysis unit, a gas desulfurization unit, and a gas dust removal unit; wherein, The gas deacidification unit is used to remove acidic substances such as chlorides, sulfates, and nitrates from blast furnace gas; The gas hydrolysis unit is used to convert organic sulfur in blast furnace gas into inorganic sulfur; The gas desulfurization unit is used to remove inorganic sulfur from blast furnace gas; The gas dust removal unit is used to adsorb and remove particulate matter from blast furnace gas.

[0008] Furthermore, the outer shell of the processing tower is provided with an anti-corrosion layer on the side that contacts the gas.

[0009] Furthermore, the anti-corrosion layer is made of epoxy coal tar thick-film anti-rust paint, and the total dry film thickness is not less than 150um.

[0010] Furthermore, the gas deacidification unit includes a packing distribution device, in which alkaline adsorbent material is loaded to chemically react with acidic substances such as chlorides, sulfates, and nitrates contained in the gas, converting the acidic substances into neutral substances, which are then retained in the gas deacidification unit, thereby extending the lifespan of the hydrolysate and adsorbent.

[0011] Furthermore, the gas hydrolysis unit includes a packing distribution device, in which an active hydrolysis catalyst is loaded to allow the organic sulfur contained in the gas to react chemically with water vapor, converting the organic sulfur into inorganic sulfur, thus creating the preconditions for the subsequent inorganic sulfur removal process.

[0012] Furthermore, the gas desulfurization unit includes a packing distribution device, in which an oxidizing desulfurizing agent is loaded to oxidize the inorganic sulfur contained in the gas into elemental sulfur, which is then retained in the gas desulfurization unit to achieve fine desulfurization of the blast furnace gas.

[0013] Furthermore, the gas dust removal unit includes a packing distribution device, in which microporous adsorption material is loaded to adsorb various particulate matter contained in the gas and retain it in the gas dust removal unit, thereby achieving particulate matter emission standards for blast furnace gas.

[0014] The present invention has the following advantages: 1. This invention employs a processing tower that integrates multiple functional modules. Multiple functional units are integrated into a single processing tower, enabling the simultaneous realization of multiple physicochemical processes such as acid removal, hydrolysis, desulfurization, and dust removal of blast furnace gas with only a single-stage processing tower. Compared with existing technologies, the number of processing towers is significantly reduced, solving the problems of current blast furnace gas purification processing towers having single functions, requiring multiple stages of processing towers, large footprint, high initial investment, and high system resistance.

[0015] 2. This invention employs an automatic temperature control system, utilizing temperature sensors and electric heaters / coolers installed in the packing distributors of each purification unit to monitor the material layer temperature of each unit in real time. When the temperature of a certain functional unit deviates from the set value required for the reaction, the control unit controls the output power of the electric heater / cooler based on the temperature signal sent by the temperature sensor, thereby achieving a constant reaction temperature in each unit. This solves the problem that fluctuations in blast furnace gas temperature significantly affect the hydrolysis and adsorption reactions of the gas purification system, causing the purification system to malfunction. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the device of the present invention.

[0017] The components include: 1. the outer shell of the treatment tower; 2. the gas deacidification unit; 3. the gas hydrolysis unit; 4. the gas desulfurization unit; 5. the gas dust removal unit; and 6. the automatic temperature control system. Detailed Implementation

[0018] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0019] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] This invention aims to provide a multifunctional dry blast furnace gas desulfurization treatment tower, comprising a tower shell; within the tower shell are arranged one or more purification functional units, which can be one or more of the following: a gas deacidification unit, a gas hydrolysis unit, a gas desulfurization unit, and a gas dust removal unit. Each purification functional unit is equipped with a temperature sensor, an electric heater, and / or an electric chiller; an automatic temperature control system is used to control the output power of the electric heater and / or electric chiller based on the temperature sensor.

[0023] Example 1 See appendix Figure 1 The dry blast furnace gas desulfurization multifunctional treatment tower of the present invention includes a treatment tower shell (1); and a gas desulfurization unit (2), a gas hydrolysis unit (3), a gas desulfurization unit (4), and a gas dust removal unit (5) are arranged sequentially from bottom to top inside the treatment tower shell (1). It also includes an automatic temperature control system; using temperature sensors and electric heaters / coolers installed in the packing distributors of each purification unit, the temperature of the packing layer in each unit is monitored in real time. When the temperature of a certain functional unit deviates from the set value required for the reaction, the control system PLC controls the output power of the electric heater / cooler according to the temperature signal sent by the temperature sensor to heat or cool the packing of that unit, so that the reaction temperature of that unit is always maintained at a constant value.

[0024] Workflow: Before purification, the blast furnace gas enters the processing tower through the raw gas inlet on the outer shell (1), and flows sequentially through the gas deacidification unit (2), gas hydrolysis unit (3), gas desulfurization unit (4), and gas dust removal unit (5), respectively completing the steps of deacidification, hydrolysis, desulfurization, and dust removal of the blast furnace gas, so that the blast furnace gas meets the ultra-low emission standard. Afterwards, it is sent to the clean gas pipeline network through the clean gas outlet on the outer shell (1) of the processing tower for use by downstream users. The automatic temperature control system uses temperature sensors and electric heaters / coolers installed in the packing distributors of each purification unit to monitor the material layer temperature of each unit in real time. When the temperature of a certain functional unit deviates from the set value required for the reaction, the control system PLC controls the output power of the electric heater / cooler according to the temperature signal sent by the temperature sensor to heat or cool the packing of the unit, so that the reaction temperature of the unit is always maintained at a constant value.

[0025] Electric switching valves are installed at the gas inlet pipeline, gas outlet pipeline, new packing inlet, and waste packing outlet. The control signals of the electric switching valves are connected to the control system PLC via hard wiring to realize the automatic start and stop of the electric switching valves on the host computer and monitor the operating status of the electric switching valves, including information such as fault, fully open, fully closed, local / remote status.

[0026] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described above. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Many other changes and modifications made without departing from the concept and scope of the present invention should be considered within the scope of protection of the present invention.

[0027] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0028] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A multi-functional dry blast furnace gas desulfurization treatment tower, characterized in that, include: Tower shell; One or more purification function units are provided inside the outer shell of the tower body; Each purification unit is equipped with a temperature sensor, as well as an electric heater and / or an electric cooler; An automatic temperature control system, wherein the automatic temperature control system controls the output power of the electric heater and / or electric cooler based on a temperature sensor.

2. The multi-functional dry blast furnace gas desulfurization treatment tower according to claim 1, characterized in that: The purification functional units include: a coal gas deacidification unit, a coal gas hydrolysis unit, a coal gas desulfurization unit, and a coal gas dust removal unit.

3. The multi-functional dry blast furnace gas desulfurization treatment tower according to claim 1, characterized in that: The purification functional unit includes, from bottom to top, a coal gas desulfurization unit, a coal gas hydrolysis unit, a coal gas desulfurization unit, and a coal gas dust removal unit; wherein, The gas deacidification unit is used to remove acidic substances such as chlorides, sulfates, and nitrates from blast furnace gas; The gas hydrolysis unit is used to convert organic sulfur in blast furnace gas into inorganic sulfur; The gas desulfurization unit is used to remove inorganic sulfur from blast furnace gas; The gas dust removal unit is used to adsorb and remove particulate matter from blast furnace gas.

4. The multi-functional dry blast furnace gas desulfurization treatment tower according to claim 1, characterized in that: The outer shell of the processing tower is provided with an anti-corrosion layer on the side that contacts the gas.

5. The multi-functional dry blast furnace gas desulfurization treatment tower according to claim 4, characterized in that: The anti-corrosion layer is made of epoxy coal tar thick-film anti-rust paint, and the total dry film thickness is not less than 150um.

6. The multi-functional dry blast furnace gas desulfurization treatment tower according to claim 3, characterized in that: The gas deacidification unit includes a packing distribution device, in which alkaline adsorbent material is loaded to react chemically with acidic substances such as chlorides, sulfates, and nitrates contained in the gas, converting the acidic substances into neutral substances and retaining them in the gas deacidification unit, thereby extending the lifespan of the hydrolysate and adsorbent.

7. The multi-functional dry blast furnace gas desulfurization treatment tower according to claim 3, characterized in that: The gas hydrolysis unit includes a packing distribution device, in which an active hydrolysis catalyst is loaded to allow the organic sulfur contained in the gas to react chemically with water vapor, converting the organic sulfur into inorganic sulfur, thus creating the preconditions for the subsequent inorganic sulfur removal process.

8. The multi-functional dry blast furnace gas desulfurization treatment tower according to claim 3, characterized in that: The gas desulfurization unit includes a packing distribution device, in which an oxidizing desulfurizing agent is loaded to oxidize the inorganic sulfur contained in the gas into elemental sulfur, which is then retained in the gas desulfurization unit to achieve fine desulfurization of the blast furnace gas.

9. The multi-functional dry blast furnace gas desulfurization treatment tower according to claim 3, characterized in that: The gas dust removal unit includes a packing distribution device, in which microporous adsorption material is loaded to adsorb various particulate matter contained in the gas and retain it in the gas dust removal unit, so as to achieve the emission of particulate matter from blast furnace gas in compliance with standards.

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