Coal chemical wet acid gas washing system

Abstract

The application provides a coal chemical wet acid gas washing system, comprising: an acid gas washing tower, the top of which is connected with a gas phase pipeline, the bottom of which is connected with a liquid outlet pipeline, and the lower side of which is connected with a desalted water supplement pipeline, and the acid gas washing tower is provided with a first spraying component; a venturi scrubber, the inlet section of which is connected with a wet acid gas pipeline so that the wet acid gas enters the venturi scrubber, the diffusion section of the venturi scrubber extends into the tower kettle of the acid gas washing tower, the venturi scrubber is provided with a second spraying component, and the wet acid gas washed by the venturi scrubber enters the acid gas washing tower; and a washing circulating pump, which is used for sending the tower kettle liquid in the acid gas washing tower to the first spraying component and the second spraying component as spraying liquid. The application can effectively remove the coal powder particles and ammonium carbonate in the wet acid gas, avoids the catalyst bed blockage caused by the direct entry of the wet acid gas into the sulfur recovery system, and can stably send the treated wet acid gas into the incinerator for incineration.

Description

Technical Field

[0001] This application falls under the technical scope of sulfur recovery processes in environmental protection equipment in the coal chemical industry, specifically involving a washing system for wet acidic gas from coal chemical plants before it is introduced into the sulfur recovery process. Background Technology

[0002] The current mainstream coal chemical process is coal-water slurry gasification + isothermal / adiabatic shift conversion + low-temperature methanol washing. In this process, the wet acid gas from the gasification hot water tower is usually converted to a shift stripping tower to replace the stripping steam. Currently, the mainstream process for treating wet acid gas in coal chemical processes is to feed it together with dry acid gas into a sulfur recovery combustion furnace or separately into an ammonia burner. This process has many drawbacks. For the ammonia burner: the furnace temperature needs to be controlled to be no lower than 1200℃, resulting in high energy consumption. Furthermore, the high water vapor content of the wet acid gas easily causes the ammonia burner to extinguish. For the combustion furnace: the wet acid gas contains a large amount of ammonium salts and pulverized coal, which can easily clog the conversion catalyst bed, increasing the pressure differential and leading to deactivation of the sulfur recovery SO3 conversion catalyst. Additionally, the high water vapor content of the wet acid gas easily causes the ammonia burner to extinguish, resulting in the dry acid gas being switched to the flare for combustion, which does not meet current environmental protection requirements. Utility Model Content

[0003] To address the aforementioned technical problems in the prior art, this application provides a coal chemical wet acid gas scrubbing system for removing coal powder and water vapor from wet acid gas.

[0004] The technical solution adopted in this application embodiment is: a coal chemical wet acid gas scrubbing system, comprising: An acid gas scrubbing tower has a gas phase pipeline connected to the top, a liquid outlet pipeline connected to the bottom, and a demineralized water replenishment pipeline connected to the lower side. The gas phase pipeline is used to discharge the scrubbed gas from the acid gas scrubbing tower, and the demineralized water replenishment pipeline is used to replenish demineralized water into the acid gas scrubbing tower. The upper part of the acid gas scrubbing tower is equipped with a first spray component for spraying and scrubbing the wet acid gas entering the acid gas scrubbing tower. The Venturi scrubber has its inlet section connected to a wet acid gas pipeline so that the wet acid gas from the conversion unit of the coal chemical process system enters the Venturi scrubber. The diffuser section of the Venturi scrubber extends into the bottom of the acid gas scrubbing tower. The Venturi scrubber is equipped with a second spray component for spraying and washing the wet acid gas entering the Venturi scrubber, and then allowing the washed wet acid gas to enter the acid gas scrubbing tower. A washing circulation pump has its inlet connected to the liquid outlet pipeline of the acid gas scrubbing tower, and its outlet connected to the first spray component and the second spray component, respectively. It is used to spray the bottom liquid in the acid gas scrubbing tower as a spray liquid into the acid gas scrubbing tower and the Venturi scrubber to wash the wet acid gas.

[0005] In some embodiments, the outlet of the washing circulation pump is connected to a main pipeline, and a spray cooler is provided on the main pipeline. The end of the main pipeline is connected to one end of a first spray pipeline and one end of a second spray pipeline, respectively. The other end of the first spray pipeline extends into the acid gas scrubbing tower and is connected to the first spray component. The other end of the second spray pipeline extends into the Venturi scrubber and is connected to the second spray component, so as to provide cooled spray water to the first spray component and the second spray component, respectively.

[0006] In some embodiments, an external supply pipeline is connected to any one of the main pipeline, the first spray pipeline, and the second spray pipeline, and the external supply pipeline is connected to the denitrification dilute ammonia water tank in the thermal power plant of the coal chemical process system.

[0007] In some embodiments, a demister is provided at the top of the acidic gas scrubbing tower, located above the first spray component, for removing entrained gaseous mist; and / or The acid gas scrubbing tower is equipped with packing material in the middle section, which is located below the first spray component and is used to scrub and absorb ammonia carbonate in the wet acid gas.

[0008] In some embodiments, the coal chemical wet acid gas scrubbing system further includes a controller; The first spray pipeline is equipped with a first regulating valve and a first flow meter. The first regulating valve and the first flow meter are respectively connected to the controller. The first flow meter is used to detect the first real-time spray flow of the first spray pipeline. The first spray pipeline has a first set spray flow. The controller receives the first real-time spray flow signal and controls the first regulating valve to adjust the opening so that the first real-time spray flow is equal to the first set spray flow.

[0009] In some embodiments, the coal chemical wet acid gas scrubbing system further includes a controller; The second spray pipeline is equipped with a second regulating valve and a second flow meter, which are respectively connected to the controller. The second flow meter is used to detect the second real-time spray flow of the second spray pipeline, which has a second set spray flow. The controller receives the second real-time spray flow signal and controls the second regulating valve to adjust its opening so that the second real-time spray flow is equal to the second set spray flow.

[0010] In some embodiments, a third flow meter is provided on the gas phase pipeline of the acid gas scrubbing tower, and the third flow meter is used to detect the flow rate of wet acid gas after scrubbing in the gas phase pipeline; The controller receives the wet acid gas flow signal detected by the third flow meter and determines the first set spray flow rate of the first spray pipeline and the second set spray flow rate of the second spray pipeline.

[0011] In some embodiments, the coal chemical wet acid gas scrubbing system further includes a controller; The acid gas scrubbing tower is equipped with a level gauge at its bottom; a third regulating valve and a fourth flow meter are installed on the external delivery pipeline; the level gauge, the third regulating valve, and the fourth flow meter are respectively connected to the controller. The level gauge is used to detect the real-time liquid level in the acid gas scrubbing tower, and the fourth flow meter is used to detect the real-time flow rate of the external delivery pipeline. The controller receives the real-time liquid level signal and compares it with the set liquid level of the acid gas scrubbing tower. The controller determines the set flow rate of the external delivery pipeline based on the comparison result. The controller also receives the real-time flow rate signal of the external delivery pipeline and compares it with the set flow rate. The controller controls the opening of the third regulating valve based on the comparison result to make the real-time flow rate equal to the set flow rate of the acid gas scrubbing tower.

[0012] In some embodiments, the coal chemical wet acid gas scrubbing system further includes a controller; The gas phase pipeline of the acid gas scrubbing tower is equipped with a fourth regulating valve and a pressure gauge. The fourth regulating valve and the pressure gauge are respectively connected to the controller. The pressure gauge is used to detect the pressure in the gas phase pipeline. The fourth regulating valve is equipped with an instrument automatic control manual valve. The controller receives the pressure signal detected by the pressure gauge and controls the fourth regulating valve to adjust the opening so that the pressure in the gas phase pipeline is within the set pressure range.

[0013] In some embodiments, the coal chemical wet acid gas scrubbing system further includes a controller; An online ammonia concentration meter is installed on any one of the main pipeline, the first spray pipeline, and the second spray pipeline; a fifth regulating valve and a fifth flow meter are installed on the replenishment and demineralization pipeline; the fifth regulating valve, the fifth flow meter, and the online ammonia concentration meter are respectively connected to the controller; the online ammonia concentration meter is used to detect the real-time ammonia concentration of the spray liquid, and the fifth flow meter is used to detect the real-time replenishment and demineralization volume of the replenishment and demineralization pipeline; the controller receives the real-time ammonia concentration signal of the spray liquid detected by the online ammonia concentration meter, determines the set replenishment and demineralization volume, and controls the fifth regulating valve to adjust the opening so that the real-time replenishment and demineralization volume is equal to the set replenishment and demineralization volume.

[0014] Compared with the prior art, the beneficial effects of the embodiments of this application are as follows: 1. This application utilizes a Venturi scrubber for rapid cooling and removal of solid particles from wet acidic gas. The acidic gas scrubbing tower then absorbs ammonium carbonate from the wet acidic gas through spraying, solving the problem of wet acidic gas treatment in coal chemical industry and improving system stability. It has significant advantages in achieving environmental protection and resource recycling, and is suitable for the pretreatment process of wet acidic gas in the coal chemical industry. It has high practical value and promotion significance.

[0015] 2. Improved system safety and stability: Compared with traditional ammonia incinerators and processes that directly feed the gas into the combustion furnace, the pretreated wet acid gas in this application can be stably fed into the sulfur recovery incinerator, reducing system fluctuations and safety hazards.

[0016] 3. Achieving environmental protection and resource recycling: The ammonia-containing wastewater generated by this application is transported to the denitrification system of the thermal power plant through an external pipeline for the preparation of ammonia water, realizing the recycling of ammonia resources; at the same time, the entire system has no wastewater discharge, achieving the environmental protection goal of "zero wastewater generation", which meets the current environmental protection requirements of the coal chemical industry.

[0017] 4. High degree of automation: The DCS control system integrates flow meters, regulating valves and other instruments of various components to form multiple automatic control loops, which can accurately control process parameters, reduce the intensity of manual operation and ensure stable operation of the process.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this application.

[0019] The overview of various implementations or examples of the technology described in this application is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0020] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The drawings generally illustrate various embodiments by way of example rather than limitation and are used, together with the description and claims, to illustrate the disclosed embodiments. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive embodiments of the apparatus or method.

[0021] Figure 1 This is a schematic diagram of a wet acidic gas scrubbing system for coal chemical industry, as described in an embodiment of this application.

[0022] Figure label: 1-Acidic gas scrubbing tower; 2-Venturi scrubber; 3-Scrubbing circulation pump; 4-Gas phase pipeline; 5-Liquid outlet pipeline; 6-Replenishment demineralized water pipeline; 7-Wet acidic gas pipeline; 8-First spray component; 9-Second spray component; 10-Main pipeline; 11-First spray pipeline; 12-Second spray pipeline; 13-Spray cooler; 14-Circulating water pipeline; 15-External supply pipeline; 16-Demister; 17-Packaging; 18-First regulating valve; 19-First flow meter; 20-Second regulating valve; 21-Second flow meter; 22-Third flow meter; 23-Third regulating valve; 24-Fourth regulating valve; 25-Fourth flow meter; 26-Fifth regulating valve; 27-Fifth flow meter; 28-Level gauge; 29-Pressure gauge; 30-Online ammonia concentration meter; 31-First thermometer; 32-Second thermometer. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the described embodiments of this application without creative effort are within the scope of protection of this application.

[0024] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] To keep the following description of the embodiments of this application clear and concise, detailed descriptions of known functions and known components are omitted.

[0026] This application provides a coal chemical wet acid gas scrubbing system for scrubbing coal chemical wet acid gas before it is sent to sulfur recovery treatment, in order to remove coal dust and water vapor carried by the coal chemical wet acid gas.

[0027] like Figure 1As shown, the coal chemical wet acid gas scrubbing system of this application embodiment includes an acid gas scrubbing tower 1, a Venturi scrubber 2, and a scrubbing circulation pump 3. The top of the acid gas scrubbing tower 1 is connected to a gas phase pipeline 4, the bottom to a liquid outlet pipeline 5, and a demineralized water replenishment pipeline 6 located on the lower side. The gas phase pipeline 4 is used to discharge the scrubbed gas (wet acid gas) from the acid gas scrubbing tower 1. The demineralized water replenishment pipeline 6 is used to replenish demineralized water into the acid gas scrubbing tower 1. A first spray component 8 is provided in the upper part of the acid gas scrubbing tower 1 for spraying and scrubbing the wet acid gas entering the acid gas scrubbing tower 1.

[0028] The inlet section of the Venturi scrubber 2 is connected to the wet acid gas pipeline 7, allowing the wet acid gas from the conversion unit (not shown in the figure) of the coal chemical process system to enter the Venturi scrubber 2. The diffuser section of the Venturi scrubber 2 extends into the bottom of the acid gas scrubbing tower 1. The Venturi scrubber 2 is equipped with a second spray component 9, which sprays and washes the wet acid gas entering the Venturi scrubber 2, and then allows the washed wet acid gas to enter the bottom of the acid gas scrubbing tower 1. The pump inlet of the washing circulation pump 3 is connected to the liquid outlet pipeline 5 of the acid gas scrubbing tower 1, and its pump outlet is connected to both the first spray component 8 and the second spray component 9, respectively, to spray the liquid from the bottom of the acid gas scrubbing tower 1 as the spray liquid into the acid gas scrubbing tower 1 and the Venturi scrubber 2 to wash the wet acid gas.

[0029] The coal chemical wet acid gas scrubbing system of this embodiment integrates a Venturi scrubber 2, an acid gas scrubbing tower 1, and a scrubbing circulation pump 3 to form a targeted wet acid gas pretreatment solution. The Venturi scrubber 2 efficiently removes over 90% of coal dust particles from the wet acid gas phase. Combined with the spray absorption effect of the packing material 17 inside the acid gas scrubbing tower 1, the wet acid gas is scrubbed and absorbed, further removing coal dust particles and absorbing ammonium carbonate from the wet acid gas into the spray liquid, forming an ammonium carbonate-containing solution. This avoids the problem of untreated wet acid gas directly entering the sulfur recovery system, which can lead to catalyst bed blockage, increased pressure differential, and deactivation of the SO3 conversion catalyst due to ammonium carbonate crystallization, thus ensuring the stable operation of the sulfur recovery system.

[0030] In some embodiments, the outlet of the washing circulation pump 3 is connected to a main pipeline 10, on which a spray cooler 13 is provided. The ends of the main pipeline 10 are respectively connected to one end of the first spray pipeline 11 and one end of the second spray pipeline 12. The other end of the first spray pipeline 11 extends into the acid gas scrubbing tower 1 and connects to the first spray component 8. The other end of the second spray pipeline 12 extends into the Venturi scrubber 2 and connects to the second spray component 9, so as to provide cooled spray water to the first spray component 8 and the second spray component 9 respectively. The spray cooler 13 is used to cool the dilute ammonia water in the bottom of the acid gas scrubbing tower 1 and use it as spray water to avoid the spray water temperature being too high and affecting the spraying effect. The washing circulation pump 3 is used to provide spray from the Venturi scrubber 2, top spray from the acid gas scrubbing tower 1, and to send part of the dilute ammonia water in the acid gas scrubbing tower 1 to the denitrification dilute ammonia water tank in the thermal power plant (described below).

[0031] A circulating water pipe 14 is connected to the spray cooler 13 to provide circulating water for cooling. The spray water exchanges heat with the circulating water in the spray cooler 13 to cool down.

[0032] A first thermometer 31 is provided on at least one of the first spray pipe 11 and the second spray pipe 12. The first thermometer 31 is used to monitor the temperature of the spray liquid after heat exchange by the spray cooler 13. Since the temperature of the spray liquid in the two spray pipes is basically the same, the first thermometer 31 is only provided on the first spray pipe 11 in this embodiment of the application.

[0033] An external transmission pipeline 15 is connected to any one of the main pipeline 10, the first spray pipeline 11, and the second spray pipeline 12. The external transmission pipeline 15 is connected to the denitrification dilute ammonia water tank in the thermal power plant of the coal chemical process system for transporting dilute ammonia water. That is, the wastewater (dilute ammonia water) generated by the system of this application is sent to the thermal power plant for denitrification and ammonia water preparation, thereby achieving ammonia recovery and zero wastewater generation. Figure 1 As shown, the external delivery pipeline 15 of this application is connected to the second spray pipeline 12.

[0034] Continue to combine Figure 1 A demister 16 is installed at the top of the acid gas scrubbing tower 1. The demister 16 is located above the first spray component 8 and is used to remove gas phase mist entrainment, prevent liquid from being carried out, and ensure mass transfer efficiency. The demister 16 can be, for example, a wire mesh demister.

[0035] The acid gas scrubbing tower 1 has a packing material 17 in its middle section, located below the first spray component 8, for scrubbing and absorbing ammonia carbonate in the wet acid gas. The packing material 17 can be, for example, 316L rectangular saddle ring packing, which can significantly remove ammonia carbonate and prevent ammonia carbonate crystallization from clogging the pipeline.

[0036] The specific structures of the first spray component 8 and the second spray component 9 are not limited and can be selected and determined according to the actual situation. For example, commonly used spray heads, nozzles, and other structures can be selected. In this embodiment, the first spray component 8 is provided with a pipe distributor, which is used to distribute the spray liquid evenly and increase the contact area between the spray liquid and the wet acidic gas.

[0037] In some embodiments, the coal chemical wet acid gas scrubbing system further includes a controller (not shown in the figure). For example... Figure 1 As shown, a first regulating valve 18 and a first flow meter 19 are provided on the first spray pipeline 11, and the first regulating valve 18 and the first flow meter 19 are respectively connected to the controller. The first flow meter 19 is used to detect the first real-time spray flow rate of the first spray pipeline 11. The first spray pipeline 11 has a first set spray flow rate. The controller receives the first real-time spray flow rate signal and controls the first regulating valve 18 to adjust the opening so that the first real-time spray flow rate is equal to the first set spray flow rate. That is, the first flow meter 19 and the first regulating valve 18 form a self-control loop. The first set spray flow rate is determined according to the amount of wet acidic gas. When the amount of wet acidic gas increases, the first set spray flow rate also increases accordingly; when the amount of wet acidic gas decreases, the first set spray flow rate also decreases accordingly, so that the pressure in the acidic gas scrubbing tower 1 is maintained within a preset pressure range.

[0038] Continue to combine Figure 1 A second regulating valve 20 and a second flow meter 21 are provided on the second spray pipeline 12. The second regulating valve 20 and the second flow meter 21 are respectively connected to the controller. The second flow meter 21 is used to detect the second real-time spray flow rate of the second spray pipeline 12, which has a second set spray flow rate. The controller receives the second real-time spray flow rate signal and controls the second regulating valve 20 to adjust its opening so that the second real-time spray flow rate is equal to the second set spray flow rate. That is, the second flow meter 21 and the second regulating valve 20 form a self-control loop. The second set spray flow rate is determined according to the amount of wet acid gas. When the amount of wet acid gas increases, the second set spray flow rate also increases accordingly; when the amount of wet acid gas decreases, the second set spray flow rate also decreases accordingly, so that the pressure in the acid gas scrubbing tower 1 is maintained within a preset pressure range.

[0039] Furthermore, such as Figure 1As shown, a third flow meter 22 is installed on the gas phase pipeline 4 of the acid gas scrubbing tower 1. The third flow meter 22 is used to detect the flow rate of the wet acid gas after scrubbing in the gas phase pipeline 4. The controller receives the wet acid gas flow rate signal detected by the third flow meter 22 and determines the first set spray flow rate of the first spray pipeline 11 and the second set spray flow rate of the second spray pipeline 12. The controller controls the opening of the first regulating valve 18 and the second regulating valve 20 to make the first real-time spray flow rate equal to the first set spray flow rate and the second real-time spray flow rate equal to the second set spray flow rate. That is, the required spray flow rate is determined based on the wet acid gas flow rate detected by the third flow meter 22. The larger the wet acid gas flow rate, the larger the spray flow rate should be, and the smaller the wet acid gas flow rate, the smaller the spray flow rate should be, so that the liquid-gas ratio meets the set requirements to effectively remove particulate matter and water vapor from the wet acid gas. For example, the liquid-to-gas ratio of the Venturi scrubber 2 is controlled at 1.5-2.2 L / m³. 3 The liquid-to-gas ratio in acid gas scrubber 1 is controlled at 7-10 L / m³. 3 .

[0040] In some embodiments, continue to combine Figure 1 A level gauge 28 is installed at the bottom of the acid gas scrubbing tower 1. A third regulating valve 23 and a fourth flow meter 25 are installed on the external delivery pipeline 15. The level gauge 28, the third regulating valve 23, and the fourth flow meter 25 are respectively connected to the controller. The level gauge 28 is used to detect the real-time liquid level in the acid gas scrubbing tower 1, and the fourth flow meter 25 is used to detect the real-time flow rate of the external delivery pipeline 15. The controller receives the real-time liquid level signal and compares it with the set liquid level of the acid gas scrubbing tower 1. The controller determines the set flow rate of the external delivery pipeline 15 based on the comparison result. The controller receives the real-time flow rate signal of the external delivery pipeline 15 and compares it with the set flow rate. The controller controls the opening of the third regulating valve 23 according to the comparison result to make the real-time flow rate equal to the set flow rate.

[0041] Specifically, the level gauge 28 detects the real-time level (i.e., actual level) of the acid gas scrubbing tower 1 in real time, compares the actual real-time level value with the set level value of the acid gas scrubbing tower 1, calculates the level deviation, and outputs a signal as the set flow rate value of the external pipeline 15. The fourth flow meter 25 detects the actual flow rate through the third regulating valve 23, compares the actual flow rate with the set flow rate value, quickly calculates the deviation, and directly controls the opening of the third regulating valve 23 to correct flow fluctuations in real time.

[0042] The self-control loop formed by the third regulating valve 23 and the fourth flow meter 25 can control the flow rate of dilute ammonia water sent to the thermal power plant and maintain the bottom liquid level of the acid gas scrubbing tower 1 at 50±5% of the bottom section volume. Here, the bottom section refers to the part of the acid gas scrubbing tower 1 below the packing 17.

[0043] In some embodiments, such as Figure 1 As shown, a fourth regulating valve 24 and a pressure gauge 29 are installed on the gas phase pipeline 4 of the acid gas scrubbing tower 1. The fourth regulating valve 24 and the pressure gauge 29 are respectively connected to a controller. The pressure gauge 29 is used to detect the pressure of the wet acid gas after scrubbing, that is, to detect the pressure within the gas phase pipeline 4. The fourth regulating valve 24 is equipped with an instrument automatic control manual valve. The controller receives the pressure signal detected by the pressure gauge 29 and controls the fourth regulating valve 24 to adjust its opening so that the pressure in the gas phase pipeline 4 is within a set pressure range. The set pressure range is, for example, 0.1 MPa - 0.15 MPa.

[0044] The gas phase pipeline 4 connects the acid gas scrubbing tower 1 to the sulfur recovery incinerator. This gas phase pipeline 4 uses low-pressure steam tracing to ensure the temperature of the washed wet acid gas remains within a preset range. A second thermometer 32 is also installed on the gas phase pipeline 4 of the acid gas scrubbing tower 1 to detect the temperature of the washed wet acid gas. The amount of low-pressure steam used for tracing is adjusted based on the detected temperature.

[0045] In some embodiments, such as Figure 1 As shown, an online ammonia concentration meter 30 is installed on any one of the main pipeline 10, the first spray pipeline 11, and the second spray pipeline 12. A fifth regulating valve 26 and a fifth flow meter 27 are installed on the replenishment / demineralization pipeline 6. The fifth regulating valve 26, the fifth flow meter 27, and the online ammonia concentration meter 30 are respectively connected to the controller. The online ammonia concentration meter 30 is used to detect the real-time ammonia concentration of the spray solution, and the fifth flow meter 27 is used to detect the real-time replenishment / demineralization rate of the replenishment / demineralization pipeline 6. The controller receives the real-time ammonia concentration signal of the spray solution detected by the online ammonia concentration meter 30, determines the set replenishment / demineralization rate, and controls the fifth regulating valve 26 to adjust its opening so that the real-time replenishment / demineralization rate equals the set replenishment / demineralization rate.

[0046] The fifth regulating valve 26 and the fifth flow meter 27 are set up with an automatic control loop. The online ammonia concentration meter 30 is used to detect the ammonia content in the spray liquid. According to the detected ammonia content, the amount of demineralized water added to the acid gas scrubbing tower 1 is automatically adjusted through the fifth regulating valve 26, and the ammonia concentration of the online ammonia concentration meter is adjusted to 2-5wt%.

[0047] The entire system of this application is centrally and intelligently controlled by a DCS (Distributed Control System). The DCS system integrates instruments such as flow meters and regulating valves of various components to form multiple automatic control loops, such as the flow rate of spray liquid in Venturi scrubber 2, the amount of demineralized water replenished, and the flow rate of dilute ammonia water sent out. This allows for precise control of process parameters, reduces the intensity of manual operation, ensures stable process operation, and reduces system fluctuations and safety hazards.

[0048] It is understood that the control methods, data comparison, and signal processing involved in this application can all be implemented using conventional techniques in the prior art. The above description is intended to be illustrative and not restrictive, and those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this disclosure. Moreover, the above examples (or one or more of them) can be used in combination with each other, and these embodiments can be combined with each other in various combinations or arrangements.

Claims

1. A wet acid gas scrubbing system for coal chemical industry, characterized in that, include: An acid gas scrubbing tower has a gas phase pipeline connected to the top, a liquid outlet pipeline connected to the bottom, and a demineralized water replenishment pipeline connected to the lower side. The gas phase pipeline is used to discharge the scrubbed gas from the acid gas scrubbing tower, and the demineralized water replenishment pipeline is used to replenish demineralized water into the acid gas scrubbing tower. The upper part of the acid gas scrubbing tower is equipped with a first spray component for spraying and scrubbing the wet acid gas entering the acid gas scrubbing tower. The Venturi scrubber has its inlet section connected to a wet acid gas pipeline so that the wet acid gas from the conversion unit of the coal chemical process system enters the Venturi scrubber. The diffuser section of the Venturi scrubber extends into the bottom of the acid gas scrubbing tower. The Venturi scrubber is equipped with a second spray component for spraying and washing the wet acid gas entering the Venturi scrubber, and then allowing the washed wet acid gas to enter the acid gas scrubbing tower. A washing circulation pump has its inlet connected to the liquid outlet pipeline of the acid gas scrubbing tower, and its outlet connected to the first spray component and the second spray component, respectively. It is used to spray the bottom liquid in the acid gas scrubbing tower as a spray liquid into the acid gas scrubbing tower and the Venturi scrubber to wash the wet acid gas.

2. The coal chemical wet acid gas scrubbing system according to claim 1, characterized in that, The outlet of the washing circulation pump is connected to a main pipeline, on which a spray cooler is installed. The end of the main pipeline is connected to one end of a first spray pipeline and one end of a second spray pipeline, respectively. The other end of the first spray pipeline extends into the acid gas scrubbing tower and is connected to the first spray component. The other end of the second spray pipeline extends into the Venturi scrubber and is connected to the second spray component, so as to provide cooled spray water to the first spray component and the second spray component, respectively.

3. The coal chemical wet acid gas scrubbing system according to claim 2, characterized in that, An external supply pipeline is connected to any one of the main pipeline, the first spray pipeline, and the second spray pipeline, and the external supply pipeline is connected to the denitrification dilute ammonia water tank in the thermal power plant of the coal chemical process system.

4. The coal chemical wet acid gas scrubbing system according to claim 2, characterized in that, A demister is installed at the top of the acidic gas scrubbing tower, located above the first spray component, for removing entrained gaseous mist; and / or The acid gas scrubbing tower is equipped with packing material in the middle section, which is located below the first spray component and is used to scrub and absorb ammonia carbonate in the wet acid gas.

5. The coal chemical wet acid gas scrubbing system according to claim 2, characterized in that, The coal chemical wet acid gas scrubbing system also includes a controller; The first spray pipeline is equipped with a first regulating valve and a first flow meter. The first regulating valve and the first flow meter are respectively connected to the controller. The first flow meter is used to detect the first real-time spray flow of the first spray pipeline. The first spray pipeline has a first set spray flow. The controller receives the first real-time spray flow signal and controls the first regulating valve to adjust the opening so that the first real-time spray flow is equal to the first set spray flow.

6. The coal chemical wet acid gas scrubbing system according to claim 5, characterized in that, The coal chemical wet acid gas scrubbing system also includes a controller; The second spray pipeline is equipped with a second regulating valve and a second flow meter, which are respectively connected to the controller. The second flow meter is used to detect the second real-time spray flow of the second spray pipeline, which has a second set spray flow. The controller receives the second real-time spray flow signal and controls the second regulating valve to adjust its opening so that the second real-time spray flow is equal to the second set spray flow.

7. The coal chemical wet acid gas scrubbing system according to claim 6, characterized in that, A third flow meter is installed on the gas phase pipeline of the acid gas scrubbing tower. The third flow meter is used to detect the flow rate of wet acid gas after scrubbing in the gas phase pipeline. The controller receives the wet acid gas flow signal detected by the third flow meter and determines the first set spray flow rate of the first spray pipeline and the second set spray flow rate of the second spray pipeline.

8. The coal chemical wet acid gas scrubbing system according to claim 3, characterized in that, The coal chemical wet acid gas scrubbing system also includes a controller; The acid gas scrubbing tower is equipped with a level gauge at its bottom; a third regulating valve and a fourth flow meter are installed on the external delivery pipeline; the level gauge, the third regulating valve, and the fourth flow meter are respectively connected to the controller. The level gauge is used to detect the real-time liquid level in the acid gas scrubbing tower, and the fourth flow meter is used to detect the real-time flow rate of the external delivery pipeline. The controller receives the real-time liquid level signal and compares it with the set liquid level of the acid gas scrubbing tower. The controller determines the set flow rate of the external delivery pipeline based on the comparison result. The controller also receives the real-time flow rate signal of the external delivery pipeline and compares it with the set flow rate. The controller controls the opening of the third regulating valve based on the comparison result to make the real-time flow rate equal to the set flow rate of the acid gas scrubbing tower.

9. The coal chemical wet acid gas scrubbing system according to claim 2, characterized in that, The coal chemical wet acid gas scrubbing system also includes a controller; The gas phase pipeline of the acid gas scrubbing tower is equipped with a fourth regulating valve and a pressure gauge. The fourth regulating valve and the pressure gauge are respectively connected to the controller. The pressure gauge is used to detect the pressure in the gas phase pipeline. The fourth regulating valve is equipped with an instrument automatic control manual valve. The controller receives the pressure signal detected by the pressure gauge and controls the fourth regulating valve to adjust the opening so that the pressure in the gas phase pipeline is within the set pressure range.

10. The coal chemical wet acid gas scrubbing system according to claim 2, characterized in that, The coal chemical wet acid gas scrubbing system also includes a controller; An online ammonia concentration meter is installed on any one of the main pipeline, the first spray pipeline, and the second spray pipeline; a fifth regulating valve and a fifth flow meter are installed on the replenishment and demineralization pipeline; the fifth regulating valve, the fifth flow meter, and the online ammonia concentration meter are respectively connected to the controller; the online ammonia concentration meter is used to detect the real-time ammonia concentration of the spray liquid, and the fifth flow meter is used to detect the real-time replenishment and demineralization volume of the replenishment and demineralization pipeline; the controller receives the real-time ammonia concentration signal of the spray liquid detected by the online ammonia concentration meter, determines the set replenishment and demineralization volume, and controls the fifth regulating valve to adjust the opening so that the real-time replenishment and demineralization volume is equal to the set replenishment and demineralization volume.

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