Blast furnace gas system and deacidification device, deacidification method and desulfurization method

Abstract

The present invention provides a blast furnace gas system and a deacidification device, a deacidification method and a desulfurization method thereof. The deacidification device includes a baking soda supply unit, a fluidized bed tank, a jet pump, a deacidification reactor, a first nitrogen pipeline, and a second nitrogen pipeline; the baking soda supply unit, the fluidized bed tank, the jet pump, and the deacidification reactor are connected in sequence; the first nitrogen pipeline is connected to the fluidized bed tank, and the second nitrogen pipeline is connected to the jet pump. When the deacidification device is used to deacidify the gas of the blast furnace gas system, it has the advantages of high deacidification efficiency, low raw material consumption, and low gas resistance loss, and the particulate matter formed after deacidification is directly filtered in the second dust collector, without the need for additional solid waste treatment equipment, thereby saving equipment funds.

Description

Technical Field

[0001] The invention belongs to the technical field of gas processing, and in particular relates to a blast furnace gas system and a deacidification device, a deacidification method and a desulfurization method thereof. Background Art

[0002] In the coal gas desulfurization system of the steel industry, in order to protect the service life of the organic sulfur hydrolysis catalyst, it is necessary to remove the chloride ions and other acid radical ions that may cause poisoning of the hydrolysis catalyst in the coal gas before the coal gas enters the desulfurization reactor. The commonly used method at present is to set up a fixed bed reactor for deacidification, and the fixed bed reactor is filled with a granular protective agent for deacidification, and the main component of the protective agent is an alkaline metal oxide. After passing through the fixed bed reactor, the coal gas enters the desulfurization reactor for desulfurization.

[0003] Generally, fixed bed reactors and desulfurization reactors are installed on the gas pipeline after the blast furnace gas residual pressure turbine power generation device (TRT) or the power recovery coaxial unit (BPRT). The gas pressure of the fixed bed reactor is lower than 20Kpa. However, the protective agent is used at a space velocity of less than 1000h -1 , the toxic capacity is less than 25%, so a larger amount of protective agent is required. Furthermore, when the protective agent fails, the amount of solid waste that needs to be treated is also larger. Moreover, the coal gas has a certain resistance loss after passing through the fixed bed reactor, which requires increasing the pressure of the coal gas entering the fixed bed reactor, thereby reducing the power generation of TRT or BPRT.

[0004] Therefore, it is necessary to provide a new coal gas deacidification device to replace the fixed bed reactor to perform the deacidification process. Summary of the invention

[0005] The object of the present invention is to provide a blast furnace gas system and a deacidification device, a deacidification method and a desulfurization method thereof to solve the above-mentioned problems.

[0006] To achieve the above-mentioned object, the present invention provides a deacidification device for blast furnace gas, comprising a baking soda supply unit, a fluidizing tank, a jet pump, a deacidification reactor, a first nitrogen pipeline, and a second nitrogen pipeline; the baking soda supply unit, the fluidizing tank, the jet pump, and the deacidification reactor are connected in sequence; the first nitrogen pipeline is connected to the fluidizing tank, and the second nitrogen pipeline is connected to the jet pump.

[0007] Optionally, a heating device is further included, and the heating device is connected to the second nitrogen pipeline.

[0008] Optionally, the baking soda supply unit includes a baking soda silo and a meter, and the meter is arranged between the baking soda silo and the fluidizing tank.

[0009] Optionally, it further comprises a first nitrogen source and a second nitrogen source, wherein the first nitrogen source is connected to the fluidizing tank via the first nitrogen pipeline, and the second nitrogen source is connected to the jet pump via the second nitrogen pipeline.

[0010] To achieve the above objectives, the present invention also provides a blast furnace gas system, comprising a blast furnace, a first dust collector, a second dust collector and a deacidification device as described in any of the preceding items; the blast furnace, the first dust collector, the deacidification reactor, and the second dust collector are connected in sequence.

[0011] Optionally, it further comprises a resource conversion device, wherein the resource conversion device is arranged downstream of the second dust collector;

[0012] The resource conversion device includes a blast furnace gas waste pressure turbine power generation device or an energy recovery coaxial unit.

[0013] Optionally, a desulfurization reactor is also included, and the desulfurization reactor is arranged downstream of the resource conversion device.

[0014] To achieve the above object, the present invention further provides a method for deacidification of blast furnace gas, which is performed based on the above-mentioned blast furnace gas system and comprises:

[0015] enabling the baking soda supply unit to supply baking soda powder to the fluidizing tank;

[0016] Introducing nitrogen gas having a first pressure and a first temperature into the fluidizing tank through the first nitrogen pipeline, so that the baking soda powder in the fluidizing tank is fluidized;

[0017] Introducing nitrogen with a second pressure and a second temperature into the jet pump through the second nitrogen pipeline to inject the fluidized baking soda powder into the deacidification reactor to deacidify the coal gas from the blast furnace and dedusted by the first dust collector;

[0018] Using the second dust collector to filter the deacidified coal gas;

[0019] The second pressure is greater than the first pressure, and the second temperature is higher than the first temperature.

[0020] Optionally, the first pressure is 50KPa-100KPa, and the second pressure is greater than 200KPa; the first temperature is 20°C-30°C, and the second temperature is 120°C-160°C; and / or,

[0021] The particle size of baking soda powder is 8 μm to 10 μm.

[0022] To achieve the above object, the present invention further provides a desulfurization method for blast furnace gas, the desulfurization method is performed based on the blast furnace gas system according to claim 7, and comprises:

[0023] enabling the baking soda supply unit to supply baking soda powder to the fluidizing tank;

[0024] Introducing nitrogen gas having a first pressure and a first temperature into the fluidizing tank through the first nitrogen pipeline, so that the baking soda powder in the fluidizing tank is fluidized;

[0025] Introducing nitrogen with a second pressure and a second temperature into the jet pump through the second nitrogen pipeline to inject the fluidized baking soda powder into the deacidification reactor to deacidify the coal gas from the blast furnace and dedusted by the first dust collector;

[0026] Using the second dust collector to filter the deacidified coal gas;

[0027] The coal gas filtered by the second dust collector sequentially enters the resource conversion device and the desulfurization reactor;

[0028] The second pressure is greater than the first pressure, and the second temperature is higher than the first temperature.

[0029] Compared with the prior art, the blast furnace gas system and its deacidification device, deacidification method and desulfurization method of the present invention have the following advantages:

[0030] The aforementioned deacidification device for blast furnace gas includes a baking soda supply unit, a fluidizing tank, a jet pump, a deacidification reactor, a first nitrogen pipeline, and a second nitrogen pipeline; the baking soda supply unit, the fluidizing tank, the jet pump, and the deacidification reactor are connected in sequence; the first nitrogen pipeline is connected to the fluidizing tank, and the second nitrogen pipeline is connected to the jet pump. The deacidification device is applied to a blast furnace gas system, and the blast furnace gas system also includes a blast furnace, a first dust collector and a second dust collector, and the deacidification reactor is connected between the first dust collector and the second dust collector. During operation, the coal gas from the blast furnace flows through the first dust collector, the deacidification reactor and the second dust collector in sequence; the baking soda supply unit provides baking soda powder to the fluidized tank, the first nitrogen pipeline introduces nitrogen with a first temperature and a first pressure into the fluidized tank so that the baking soda powder in the fluidized tank is formed into a fluidized state, and the second nitrogen pipeline introduces nitrogen with a second temperature and a second pressure into the jet pump so that the jet pump injects the fluidized baking soda powder into the deacidification reactor, so that the baking soda powder reacts with the chloride ions and acid radical ions in the coal gas in the deacidification reactor to deacidify the coal gas. The deacidified coal gas carries particulate matter generated by the reaction, which is filtered and removed after entering the second dust collector. The coal gas deacidified by the deacidification device can enter subsequent devices, such as a resource conversion device and a desulfurization reactor. The deacidification device has the advantages of high deacidification efficiency, small amount of raw materials (i.e. baking soda), and small gas resistance loss. In addition, the particulate matter formed after deacidification is directly filtered in the second dust collector, without the need for additional solid waste treatment equipment, thus saving equipment funds. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation of the present invention.

[0032] Figure 1 is a schematic diagram of a blast furnace gas system provided according to an embodiment of the present invention;

[0033] [Description of reference numerals is as follows]:

[0034] 100-blast furnace, 200-first dust collector, 300-second dust collector, 400-deacidification device, 410-baking soda supply department, 411-baking soda silo, 412-meter, 420-fluidizing tank, 430-jet pump, 440-deacidification reactor, 450-first nitrogen pipeline, 460-second nitrogen pipeline, 470-heater, 500-resource conversion device, 600-desulfurization reactor. DETAILED DESCRIPTION

[0035] The following is an explanation of the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the present embodiment only illustrate the basic concept of the present invention in a schematic manner, and only the components related to the present invention are shown in the figure instead of being drawn according to the number, shape and size of the components in the actual implementation. The type, quantity and proportion of each component in the actual implementation can be a random change, and the component layout type may also be more complicated.

[0036] In addition, each embodiment of the following description has one or more technical features, but this does not mean that the user of the present invention must implement all the technical features in any embodiment at the same time, or can only implement part or all of the technical features in different embodiments separately. In other words, under the premise that implementation is possible, those skilled in the art can selectively implement part or all of the technical features in any embodiment according to the disclosure of the present invention and according to the design specifications or implementation requirements, or selectively implement a combination of part or all of the technical features in multiple embodiments, thereby increasing the flexibility of the implementation of the present invention.

[0037] As used in this specification, the singular forms "one", "an" and "the" include plural objects, and the plural form "multiple" includes more than two objects, unless the content clearly indicates otherwise. As used in this specification, the term "or" is usually used in the sense of including "and / or", unless the content clearly indicates otherwise, and the terms "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. Relational terms such as the terms "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor do they indicate or imply relative importance or implicitly indicate the number of technical features indicated. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In order to make the purpose, advantages and features of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are all in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar components.

[0039] Figure 1 Schematic diagram of a blast furnace gas system provided by an embodiment of the present invention. Figure 1 As shown, the blast furnace gas system includes a blast furnace 100, a first dust collector 200, a second dust collector 300, and a deacidification device 400. The deacidification device 400 includes a baking soda supply unit 410, a fluidizing tank 420, a jet pump 430, a deacidification reactor 440, a first nitrogen pipeline 450, and a second nitrogen pipe section 460. The baking soda supply unit 410, the fluidizing tank 420, the jet pump 430, and the deacidification reactor 440 are connected in sequence, the first nitrogen pipeline 450 is connected to the fluidizing tank 420, and the second nitrogen pipeline 460 is connected to the ejector 430. The blast furnace 100, the first dust collector 200, the deacidification reactor 440, and the second dust collector 300 are connected in sequence.

[0040] During operation, in the deacidification device 400, the baking soda supply unit 410 supplies baking soda powder to the fluidizing tank 420, the first nitrogen pipeline 450 introduces nitrogen with a first pressure and a first temperature into the fluidizing tank 420, so that the baking soda powder in the fluidizing tank 420 is formed into a fluidized state, and the second nitrogen pipeline 460 introduces nitrogen with a second pressure and a second temperature into the jet pump 430, and serves as a power source so that the jet pump 430 injects the fluidized baking soda into the deacidification reactor 440. The coal gas flows from the blast furnace 100 through the first dust collector 200 for the first dust removal and filtration, and then enters the deacidification reactor 440. In the deacidification reactor 440, the chloride ions and acid radical ions in the coal gas react with the baking soda to achieve deacidification. It can be understood that the reactant solid particles of the chloride ions, acid radical ions and baking soda. The deacidified coal gas carries the solid particles generated by the reaction into the second dust collector 300 for a second dust removal and filtration.

[0041] This deacidification method has the following advantages:

[0042] (1) Baking soda powder is dispersed in the deacidification reactor 440, and has a large contact area with the coal gas, which can effectively improve the deacidification efficiency and effect, thereby reducing the amount of baking soda powder used, while reducing the deacidification cost and the amount of solid waste generated by deacidification.

[0043] (2) The baking soda powder is dispersed in the deacidification reactor 440, which creates little resistance to the coal gas, thereby reducing the resistance loss of the coal gas during the deacidification process. Therefore, when the deacidified coal gas is used to generate electricity, the power generation will not be reduced.

[0044] (3) The solid particulate matter generated during deacidification can be directly filtered out by the second dust collector 300, so that the solid particulate matter can be treated as part of the filter cake in the second dust collector 300. There is no need to set up an additional solid waste treatment equipment for the deacidified solid waste, thereby reducing equipment costs and equipment land.

[0045] (4) The various components of the deacidification device 400 have simple structures and are easy to maintain.

[0046] In the embodiment of the present invention, the first dust collector 200 is, for example, a blast furnace gravity dust collector, and the second dust collector 300 is, for example, a bag dust collector.

[0047] In fact, the embodiment of the present invention has no special requirements for the first temperature and the first pressure, as long as the nitrogen entering the fluidizing tank 420 through the first nitrogen pipeline 450 can fluidize the baking soda powder in the fluidizing tank 420. Optionally, the first temperature is room temperature, such as 20°C to 30°C, and the first pressure is 50KPa to 100KPa.

[0048] Preferably, the second temperature is equivalent to the temperature of the coal gas entering the deacidification reactor 440, and the second pressure is greater than the pressure of the coal gas entering the deacidification reactor 440. The advantage of this is that the temperature of the fluidized baking soda sprayed into the deacidification reactor 440 is equivalent to the temperature of the coal gas and the pressure is greater than the pressure of the coal gas, so that the coal gas does not drop in temperature and pressure when flowing through the deacidification reactor 440. Therefore, when the deacidified coal gas is used to generate electricity later, the power generation will not be reduced due to the decrease in the temperature and pressure of the coal gas. In practice, the temperature of the coal gas entering the deacidification reactor 440 is 120℃~160℃ and the pressure is 200Kpa. Therefore, the second temperature is 120℃~160℃, and the second pressure is greater than 200Kpa. It can be understood that the second pressure cannot be too large, otherwise it will cause excessive pressure in the deacidification reactor 440 and easily cause safety hazards.

[0049] In addition, the smaller the particle size of the baking soda powder, the more fully it contacts the coal gas, and the higher the deacidification efficiency. However, the smaller the particle size of the baking soda, the higher its cost. Considering both the deacidification efficiency and the cost, the particle size of the baking soda powder is preferably 8 μm to 10 μm.

[0050] Optionally, the baking soda supply unit 410 includes a baking soda silo 411 and a meter 412, and the meter 412 is disposed between the baking soda silos 411. The baking soda silo 411 is used to store baking soda powder, and the baking soda powder is quantitatively supplied to the fluidizing tank 420 after being measured by the meter 412.

[0051] Optionally, the deacidification device 400 further includes a heating device 470, which is connected to the second nitrogen pipeline 460 and is used to heat the nitrogen so that the temperature of the nitrogen reaches the second temperature.

[0052] In some examples, the heating device 470 is a heat exchanger, and the nitrogen at room temperature and the second pressure exchanges heat in the heating device 470 and reaches the second temperature before flowing into the second nitrogen pipeline 460. In other examples, the heating device is a heating wire wound around the second nitrogen pipeline, and the nitrogen at room temperature and the second pressure is heated to the second temperature when flowing through the portion of the second nitrogen pipeline where the heating wire is provided.

[0053] Optionally, the deacidification device further includes a first nitrogen source and a second nitrogen source (not shown in the figure). The first nitrogen source is connected to the first nitrogen pipeline 450 to provide nitrogen with a first pressure to the fluidizing tank 420. The second nitrogen source and the second nitrogen pipeline 460 provide nitrogen with a second pressure.

[0054] Furthermore, the blast furnace gas system further includes a resource conversion device 500, and the resource conversion device 500 is arranged downstream of the second dust collector 300. That is, the gas after dust removal and filtration in the second dust collector 300 enters the resource conversion device 500 for resource conversion.

[0055] Optionally, the resource conversion device 500 is TRT or BPRT.

[0056] Furthermore, the blast furnace gas system further includes a desulfurization reactor 600, which is arranged downstream of the resource conversion device 500. In this way, the coal gas flowing out of the resource conversion device 500 enters the desulfurization reactor 600 for desulfurization. It can be understood that the desulfurization reactor 600 includes a reactor shell and a catalyst arranged in the reactor shell, and the sulfur-containing substances in the coal gas react with the desulfurizer under the catalysis of the catalyst and are removed. Since the coal gas entering the desulfurization reactor 600 has been deacidified by the deacidification reactor 440, the coal gas entering the desulfurization reactor 600 contains almost no or very small amounts of chloride ions and acidic ions, which effectively avoids catalyst poisoning.

[0057] Furthermore, an embodiment of the present invention also provides a deacidification device for blast furnace gas, and the deacidification device is the aforementioned deacidification device 400.

[0058] Furthermore, an embodiment of the present invention also provides a method for deacidification of blast furnace gas, which is performed based on the above-mentioned blast furnace gas system. The deacidification method specifically includes:

[0059] The baking soda supply part 410 supplies baking soda powder to the fluidizing tank 420 .

[0060] Introducing nitrogen gas having the first pressure and the first temperature into the fluidizing tank 420 through the first nitrogen pipeline 450, so that the baking soda powder in the fluidizing tank 420 is fluidized;

[0061] Nitrogen with the second pressure and the second temperature is introduced into the jet pump 430 through the second nitrogen pipeline 460 to inject the fluidized baking soda powder into the deacidification reactor 440, so that the baking soda powder reacts with the coal gas from the blast furnace 100 and after the dust removal by the first dust collector 200 to remove the acid.

[0062] The second dust collector 300 is used to filter the deacidified coal gas.

[0063] Furthermore, an embodiment of the present invention also provides a desulfurization method for blast furnace gas, which is also performed based on the above-mentioned blast furnace gas system. The desulfurization method specifically includes:

[0064] The baking soda supply part 410 supplies baking soda powder to the fluidizing tank 420 .

[0065] Introducing nitrogen gas having the first pressure and the first temperature into the fluidizing tank 420 through the first nitrogen pipeline 450, so that the baking soda powder in the fluidizing tank 420 is fluidized;

[0066] Nitrogen with the second pressure and the second temperature is introduced into the jet pump 430 through the second nitrogen pipeline 460 to inject the fluidized baking soda powder into the deacidification reactor 440, so that the baking soda powder reacts with the coal gas from the blast furnace 100 and after the dust removal by the first dust collector 200 to remove the acid.

[0067] The second dust collector 300 is used to filter the deacidified coal gas.

[0068] The coal gas filtered by the second dust collector 300 enters the resource conversion device 500 and the desulfurization reactor 600 in sequence.

[0069] Although the present invention is disclosed as above, it is not limited thereto. Those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A deacidification device for blast furnace gas, characterized in that: It includes a baking soda supply unit, a fluidizing tank, a jet pump, a deacidification reactor, a first nitrogen pipeline, and a second nitrogen pipeline; the baking soda supply unit, the fluidizing tank, the jet pump, and the deacidification reactor are connected in sequence; the first nitrogen pipeline is connected to the fluidizing tank, and the second nitrogen pipeline is connected to the jet pump.

2. The deacidification device for blast furnace gas according to claim 1, characterized in that: It also includes a heating device, which is connected to the second nitrogen pipeline.

3. The deacidification device according to claim 1, characterized in that: The baking soda supply unit includes a baking soda silo and a meter, and the meter is arranged between the baking soda silo and the fluidizing tank.

4. The deacidification device for blast furnace gas according to claim 1, characterized in that: The gas tank further comprises a first nitrogen source and a second nitrogen source, wherein the first nitrogen source is connected to the fluidizing tank via the first nitrogen pipeline, and the second nitrogen source is connected to the jet pump via the second nitrogen pipeline.

5. A blast furnace gas system, characterized in that: It comprises a blast furnace, a first dust collector, a second dust collector and a deacidification device as described in any one of claims 1 to 4; the blast furnace, the first dust collector, the deacidification reactor, and the second dust collector are connected in sequence.

6. The blast furnace gas system according to claim 5, characterized in that: Also included is a resource conversion device, the resource conversion device being disposed downstream of the second dust collector; The resource conversion device includes a blast furnace gas waste pressure turbine power generation device or an energy recovery coaxial unit.

7. The blast furnace gas system according to claim 6, characterized in that: It also includes a desulfurization reactor, which is arranged downstream of the resource conversion device.

8. A method for deacidifying blast furnace gas, characterized in that: The deacidification method is performed based on the blast furnace gas system according to claim 5, and comprises: enabling the baking soda supply unit to supply baking soda powder to the fluidizing tank; Introducing nitrogen gas having a first pressure and a first temperature into the fluidizing tank through the first nitrogen pipeline, so that the baking soda powder in the fluidizing tank is fluidized; Introducing nitrogen with a second pressure and a second temperature into the jet pump through the second nitrogen pipeline to inject the fluidized baking soda powder into the deacidification reactor to deacidify the coal gas from the blast furnace and dedusted by the first dust collector; Using the second dust collector to filter the deacidified coal gas; The second pressure is greater than the first pressure, and the second temperature is higher than the first temperature.

9. The method for deacidifying blast furnace gas according to claim 8, characterized in that: The first pressure is 50KPa-100KPa, and the second pressure is greater than 200KPa; the first temperature is 20°C-30°C, and the second temperature is 120°C-160°C; and / or, The particle size of baking soda powder is 8 μm to 10 μm.

10. A method for desulfurizing blast furnace gas, characterized in that: The desulfurization method is performed based on the blast furnace gas system according to claim 7, and comprises: enabling the baking soda supply unit to supply baking soda powder to the fluidizing tank; Introducing nitrogen gas having a first pressure and a first temperature into the fluidizing tank through the first nitrogen pipeline, so that the baking soda powder in the fluidizing tank is fluidized; Introducing nitrogen with a second pressure and a second temperature into the jet pump through the second nitrogen pipeline to inject the fluidized baking soda powder into the deacidification reactor to deacidify the coal gas from the blast furnace and dedusted by the first dust collector; Using the second dust collector to filter the deacidified coal gas; The coal gas filtered by the second dust collector sequentially enters the resource conversion device and the desulfurization reactor; The second pressure is greater than the first pressure, and the second temperature is higher than the first temperature.

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