Tail gas treatment device and methanol synthesis tail gas treatment system

Abstract

The utility model relates to the technical field of tail gas treatment, in particular to a tail gas treatment device and a methanol synthesis tail gas treatment system. The tail gas treatment device comprises a water supply header pipe and a washing tower, the water supply header pipe is used for conveying secondary pressure boiler water, and a first control valve and a control adjusting valve are arranged on the water supply header pipe; one port of the water supply header pipe is used for receiving secondary pressure boiler water, and the other port of the water supply header pipe is communicated with the washing tower; the first control valve, the control adjusting valve and the washing tower are sequentially arranged along the water flow direction. Through the arrangement, the secondary pressure boiler water is conveyed to the washing tower through the water supply header pipe, so that the problem that the washing tower is forced to stop due to interruption of a washing water source is solved, and meanwhile, the running safety of the methanol synthesis tail gas treatment system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of tail gas treatment, and in particular to a tail gas treatment device and a methanol synthesis tail gas treatment system. Background Art

[0002] The scrubbers of large-scale methanol synthesis chemical enterprises generally use desalted water as the water source, and use a pressure pump to pressurize it to the pressure required by the process and put it into the scrubbing system for operation. In the existing process, the scrubber of methanol synthesis tail gas may be forced to partially stop the production system due to failure of the pressurizing equipment or interruption of the scrubbing water source, which brings great safety hazards to safe and stable production.

[0003] There are usually two washing water booster pumps, one in operation and one in standby. However, when the washing water booster pump fails or the pipeline fails, the higher the operating pressure of the washing system, the more difficult it is to start the standby pump in time to restore water replenishment, and it is difficult to achieve voltage stabilization switching. Especially when the washing system pressure, temperature, flow, washing effect and other parameters are required to be high, if voltage stabilization switching cannot be achieved, the system will inevitably stop due to unstable parameters when the booster system is switched, which poses certain safety hazards. Utility Model Content

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a tail gas treatment device and a methanol synthesis tail gas treatment system to improve the safety of the operation of the tail gas treatment system.

[0005] In the first aspect, an embodiment of the present application provides a tail gas treatment device for a methanol synthesis tail gas treatment system, the tail gas treatment device comprising a water supply main and a washing tower, wherein the water supply main is used to transmit secondary pressure boiler water, and a first control valve and a control regulating valve are provided on the water supply main; one port of the water supply main is used to receive secondary pressure boiler water, and the other port of the water supply main is connected to the washing tower; the first control valve, the control regulating valve and the washing tower are arranged in sequence along the water flow direction.

[0006] In some embodiments, the exhaust gas treatment device further comprises:

[0007] a first water supply branch pipe, the first water supply branch pipe being connected in parallel with the water supply main pipe, and a second control valve, a water cooler and a third control valve being arranged in sequence on the first water supply branch pipe in the direction of water flow;

[0008] The second control valve, the water cooler and the third control valve are connected in parallel with the first control valve, and the second control valve, the water cooler and the third control valve are connected in series with the control regulating valve.

[0009] In some embodiments, the exhaust gas treatment device further comprises:

[0010] A second water supply branch pipe, one port of the second water supply branch pipe is connected to the water supply main pipe, and the other port of the second water supply branch pipe is used for receiving washing desalted water.

[0011] In some embodiments, a booster pump and a fourth control valve are sequentially arranged on the second water supply branch pipe along the water flow direction;

[0012] The booster pump is connected in series with the fourth control valve.

[0013] In some embodiments, the exhaust gas treatment device further comprises:

[0014] A return branch pipe, the return branch pipe is connected in parallel with the second water supply branch pipe;

[0015] The reflux branch pipe is provided with a booster pump reflux valve, and the booster pump reflux valve is connected in parallel with the booster pump.

[0016] In some embodiments, the control valve is used to regulate water flow.

[0017] In some embodiments, the material of the water supply main includes high temperature resistant material and low temperature resistant material;

[0018] The material of the first water supply branch pipe includes high temperature resistant material and low temperature resistant material.

[0019] In some embodiments, the washing tower has a liquid inlet and a liquid outlet, the liquid inlet is connected to the water supply main, and the liquid outlet is used to discharge the washing liquid.

[0020] In some embodiments, the scrubbing tower further has an air inlet and an exhaust port, and the air inlet is used to receive chemical tail gas.

[0021] In the second aspect, an embodiment of the present application provides a methanol synthesis tail gas treatment system, which includes a tail gas treatment device and a secondary pressure boiler, and the tail gas treatment device is the tail gas treatment device described in any one of the above items; the water supply main pipe connects the secondary pressure boiler and the washing tower; or, the water supply main pipe cooperates with the first water supply branch pipe to connect the secondary pressure boiler and the washing tower.

[0022] Beneficial effects of the present application: Different from the prior art, the tail gas treatment device and the methanol synthesis tail gas treatment system provided by the embodiments of the present application. The tail gas treatment device includes a water supply main and a washing tower, wherein the water supply main is used to transmit sub-pressure boiler water, and a first control valve and a control regulating valve are provided on the water supply main; one port of the water supply main is used to receive sub-pressure boiler water, and the other port of the water supply main is connected to the washing tower; the first control valve, the control regulating valve and the washing tower are arranged in sequence along the water flow direction. Through the above arrangement, the sub-pressure boiler water is transported to the washing tower through the water supply main to solve the problem that the washing tower is forced to stop due to the interruption of the washing water source, thereby improving the safety of the operation of the methanol synthesis tail gas treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 is a schematic diagram of the structure of the exhaust gas treatment device provided in an embodiment of the present application;

[0026] Figure 2 is a structural schematic diagram of another embodiment of the exhaust gas treatment device provided by the present application;

[0027] Figure 3 It is a structural schematic diagram of another embodiment of the exhaust gas treatment device provided by the present application;

[0028] Figure 4 It is a structural schematic diagram of a methanol synthesis tail gas treatment system provided in an embodiment of the present application.

[0029] Figure numerals: tail gas treatment device 100, water supply main 110, washing tower 101, first control valve 111, control regulating valve 112, first water supply branch 120, second control valve 121, water cooler 122, third control valve 123, second water supply branch 130, booster pump 131, fourth control valve 132, reflux branch 140, booster pump reflux valve 141, methanol synthesis tail gas treatment system 200, secondary pressure boiler 210. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0032] The terms "first", "second", and "third" in this application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second", and "third" can explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. All directional indications in the embodiments of this application (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. The terms "including" and "having" in the embodiments of this application and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or components inherent to these processes, methods, products, or devices.

[0033] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0034] The present application is described in detail below with reference to the accompanying drawings and embodiments.

[0035] See also Figure 1 , Figure 1 It is a structural schematic diagram of the first embodiment of the exhaust gas treatment device provided in this application.

[0036] An embodiment of the present application provides a tail gas treatment device 100, which is used for a methanol synthesis tail gas treatment system 200 introduced in a subsequent embodiment. The tail gas treatment device 100 includes a water supply main 110 and a washing tower 101, wherein the water supply main 110 is used to transmit secondary pressure boiler water, and a first control valve 111 and a control regulating valve 112 are provided on the water supply main 110; one port of the water supply main 110 is used to receive secondary pressure boiler water, and the other port of the water supply main 110 is connected to the washing tower 101; the first control valve 111, the control regulating valve 112 and the washing tower 101 are arranged in sequence along the water flow direction.

[0037] Exemplarily, the methanol synthesis tail gas treatment system 200 may be a methanol synthesis tail gas washing system.

[0038] In some embodiments, the material of the water supply main pipe 110 may include low-temperature resistant materials and high-temperature resistant materials to prevent the water supply main pipe 110 from being damaged due to excessively low or high temperatures, thereby affecting the stability of system operation.

[0039] Specifically, when the methanol synthesis tail gas washing system is in operation, if the pressurizing equipment fails or the washing water source is interrupted, the first control valve 111 is opened to deliver secondary pressure boiler water, and the flow rate of the secondary pressure boiler water is controlled by controlling the regulating valve 112, so that the secondary pressure boiler water enters the washing tower 101 to provide a washing water source for the washing tower 101, so that the methanol synthesis tail gas washing system can be restored and replenished in time, avoiding the problem of the methanol synthesis tail gas washing system being forced to partially stop, and improving the safety of the system operation.

[0040] It should be noted that the tail gas treatment device 100 provided in this embodiment can be used during the operation of the methanol synthesis tail gas washing system in winter to provide a backup water source for the methanol synthesis tail gas washing system. This solves the problem that the methanol synthesis tail gas washing system cannot be replenished with water in time due to a failure of the pressurizing equipment or an interruption of the washing water source, improves the stability of the system operation, and reduces the safety hazards of the system operation.

[0041] See also Figure 2 , Figure 2 It is a structural schematic diagram of another embodiment of the exhaust gas treatment device provided in the present application.

[0042] As an extension and refinement of the above embodiment, the present application provides another embodiment of the exhaust gas treatment device, referring to Figure 2 As shown, the tail gas treatment device 100 provided in this embodiment is Figure 1 The structure of the exhaust gas treatment device provided in the embodiment shown is different in that: the exhaust gas treatment device 100 provided in this embodiment further includes a first water supply branch pipe 120, and the first water supply branch pipe 120 is connected in parallel with the water supply main pipe 110. Figure 1The same partial structure of the exhaust gas treatment device provided in the illustrated embodiment will not be described in detail, and reference is made to the above description for details.

[0043] In some embodiments, a second control valve 121, a water cooler 122 and a third control valve 123 are sequentially provided on the first water supply branch pipe 120 along the water flow direction; wherein, the second control valve 121, the water cooler 122 and the third control valve 123 are connected in parallel with the first control valve 111, and the second control valve 121, the water cooler 122 and the third control valve 123 are connected in series with the control regulating valve 112.

[0044] In some embodiments, the material of the first water supply branch pipe 120 may include low-temperature resistant materials and high-temperature resistant materials to prevent the first water supply branch pipe 120 from being damaged due to excessively low or high temperatures, thereby affecting the stability of system operation.

[0045] Specifically, when the methanol synthesis tail gas washing system is in operation, if there is a failure in the pressurizing equipment or an interruption in the washing water source, the second control valve 121, the third control valve 123 and the control regulating valve 112 are opened in sequence. At this time, the first control valve 111 is in a closed state, so that the relatively high temperature secondary pressure boiler water is cooled by the water cooler 122, and then the secondary pressure boiler water that meets the washing water temperature requirement is transported to the washing tower 101 as the washing water source, so that the methanol synthesis tail gas washing system can be restored to replenish water in time, avoiding the problem of the methanol synthesis tail gas washing system being forced to partially stop, and improving the safety of the system operation.

[0046] It should be noted that the tail gas treatment device 100 provided in this embodiment can be used during the operation of the methanol synthesis tail gas washing system when the temperature is high in summer to provide a backup water source for the methanol synthesis tail gas washing system. Figure 2 The tail gas treatment device provided in the illustrated embodiment can be used together to solve the problem of timely replenishing the backup washing water source for the methanol synthesis tail gas washing system in any season including summer and winter, thereby improving the stability of the system operation and reducing the potential safety hazards of the system operation.

[0047] See also Figure 3 , Figure 3 It is a structural schematic diagram of another embodiment of the exhaust gas treatment device provided in the present application.

[0048] As an extension and refinement of the above embodiment, the present application provides another embodiment of the exhaust gas treatment device, referring to Figure 3 As shown, the tail gas treatment device 100 provided in this embodiment is Figure 2The tail gas treatment device provided in the embodiment shown in the figure is different in structure in that the tail gas treatment device 100 provided in the embodiment further includes a second water supply branch pipe 130, one port of the second water supply branch pipe 130 is connected to the water supply main pipe 110, and the other port of the second water supply branch pipe 130 is used to receive the washing desalted water. Figure 2 The same partial structure of the exhaust gas treatment device provided in the illustrated embodiment will not be described in detail, and reference is made to the above description for details.

[0049] In some embodiments, a booster pump 131 and a fourth control valve 132 are sequentially provided on the second water supply branch pipe 130 along the water flow direction; the booster pump 131 is connected in series with the fourth control valve 132; the booster pump 132 provides the necessary pressure supply for washing desalted water, and when the fourth control valve 132 is opened, the washing desalted water enters the washing tower 101 through the second water supply pipe 130 after being pressurized by the booster pump 132.

[0050] In some embodiments, the exhaust gas treatment device 100 also includes a reflux branch 140, which is connected in parallel with the second water supply branch 130; a booster pump reflux valve 141 is provided on the reflux branch 140, and the booster pump reflux valve 141 is connected in parallel with the booster pump 131; the booster pump reflux valve 141 plays a role in protecting the booster pump 131 in the exhaust gas treatment device. If the washing desalted water flows back in the second water supply branch 130, it is very likely that the booster pump 131 will reverse, and the setting of the booster pump reflux valve 141 can effectively prevent damage to the booster pump 131, extend the service life of the equipment, and reduce the cost of repairing and replacing the equipment.

[0051] In some embodiments, the control valve 112 is used to regulate the water flow to prevent the pressure of the secondary pressure boiler water from being too high, and is used to adjust the flow of the secondary pressure boiler water in the water supply main 110 to control the pressure of the secondary pressure boiler water.

[0052] In some embodiments, the washing tower 101 has a liquid inlet (not marked in the figure) and a liquid outlet (not marked in the figure), the liquid inlet is connected to the water supply main 110, and the liquid outlet is used to discharge the washing liquid.

[0053] In some embodiments, the scrubbing tower further has an air inlet (not marked in the figure) and an exhaust port (not marked in the figure), and the air inlet is used to receive chemical exhaust gas.

[0054] Specifically, when the methanol synthesis tail gas washing system is in operation, the washing desalted water is pressurized by the booster pump 131 and then enters the washing tower 101 through the fourth control valve 132, and is in a standby state, saving the electric energy and maintenance cost of the booster pump 131. When the tail gas treatment device 100 provided by the above two embodiments of the present application is not in use, the booster pump 131 is started, and the washing desalted water is pressurized by the booster pump 131 and then enters the washing tower 101 through the fourth control valve 132, and the control regulating valve 112 and the washing water control valve are closed one by one.

[0055] It should be noted that the exhaust gas treatment device 100 provided in any of the above embodiments of the present application can switch the voltage according to the temperature change without stopping the vehicle. Figure 2 When the tail gas treatment device 100 provided in the embodiment shown is in operation, the flow rate of the secondary pressure boiler water can be controlled by opening the first control valve 111 and then slowly closing the second control valve 121 and using the control regulating valve 112; that is, Figure 2 The exhaust gas treatment device 100 provided in the embodiment shown can be switched to Figure 1 The exhaust gas treatment device 100 provided in the illustrated embodiment also closes the third control valve 123, that is, the water cooler can be cut out of the system for maintenance.

[0056] In some embodiments, when Figure 1 When the tail gas treatment device 100 provided in the embodiment shown is in operation, the second control valve 121 and the third control valve 123 can be opened in sequence, and then the first control valve 111 is slowly closed and the flow rate of the secondary pressure boiler water is regulated by the control regulating valve 112; that is, Figure 1 The exhaust gas treatment device 100 provided in the embodiment shown can be switched to Figure 2 The embodiment shown provides an exhaust gas treatment device 100 .

[0057] In some embodiments, when Figure 1 and Figure 2 The exhaust gas treatment device 100 provided in the embodiment shown needs to be switched to the following when in operation: Figure 3 The tail gas treatment device 100 provided in the embodiment shown in the figure first confirms that the fourth control valve 132 is closed, the booster pump return valve 141 is opened, the booster pump 131 is started, and the control regulating valve 112 is slowly closed, and the switch can be made to the following state: Figure 3 The exhaust gas treatment device 100 is provided in the illustrated embodiment.

[0058] To sum up, the exhaust gas treatment device 100 provided in the embodiment of the present application utilizes sub-high-pressure boiler water as the water source for daily production, saving the electric energy consumed by the original design of pressurizing using the booster pump 131 and the maintenance cost of the booster pump; in winter and summer, the washing water supply mode can be adjusted and switched online according to temperature changes, so that the methanol synthesis exhaust gas washing system can operate green and economically; different backup washing water sources can be switched at a stable pressure without affecting the continuous operation of the methanol synthesis exhaust gas treatment system; it has the advantages of simple and economical transformation, safety and reliability, and easy popularization.

[0059] See also Figure 4 , Figure 4 It is a structural schematic diagram of a methanol synthesis tail gas treatment system provided in an embodiment of the present application.

[0060] The embodiment of the present application provides a methanol synthesis tail gas treatment system 200. The methanol synthesis tail gas treatment system 200 includes a tail gas treatment device 100 and a secondary pressure boiler 210. The tail gas treatment device 100 is the tail gas treatment device 100 introduced in any of the above embodiments, so the same parts are not repeated.

[0061] In one embodiment, the water supply main pipe 110 connects the secondary pressure boiler 210 and the washing tower 101; or, the water supply main pipe 110 cooperates with the first water supply branch pipe 120 to connect the secondary pressure boiler 210 and the washing tower 101. It should be noted that when the methanol synthesis tail gas washing system is operated in winter, the temperature of the secondary pressure boiler water is relatively low and meets the washing water temperature requirements, and the lower temperature secondary pressure boiler water can be directly transported to the washing tower 101 through the water supply main pipe 110 as a washing water source; when the methanol synthesis tail gas washing system is operated in summer or in a southern city with a higher temperature, the temperature of the secondary pressure boiler water is relatively high and does not meet the washing water temperature requirements, so the water supply main pipe 110 and the first water supply branch pipe 120 need to cooperate to cool down through the water cooler 122, so that the secondary pressure boiler water temperature meets the washing water temperature requirements before being transported to the washing tower 101.

[0062] In summary, the embodiments of the present application provide a tail gas treatment device and a methanol synthesis tail gas treatment system. The tail gas treatment device includes a water supply main and a washing tower, wherein the water supply main is used to transmit secondary pressure boiler water, and a first control valve and a control regulating valve are provided on the water supply main; one port of the water supply main is used to receive secondary pressure boiler water, and the other port of the water supply main is connected to the washing tower; the first control valve, the control regulating valve and the washing tower are arranged in sequence along the water flow direction. The methanol synthesis tail gas treatment system provided by the embodiments of the present application includes the tail gas treatment device and the secondary pressure boiler provided in any of the above embodiments; the secondary pressure boiler water provides a backup water source for the washing tower through the water supply main to solve the problem that the washing tower is forced to stop due to the interruption of the washing water source, thereby improving the safety of the operation of the methanol synthesis tail gas treatment system.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A tail gas treatment device, which is used in a methanol synthesis tail gas treatment system, characterized in that: include: A water supply main pipe, used for transmitting secondary pressure boiler water, wherein the water supply main pipe is provided with a first control valve and a control regulating valve; A washing tower, wherein one port of the water supply main is used to receive secondary pressure boiler water, and another port of the water supply main is connected to the washing tower; The first control valve, the control regulating valve and the washing tower are arranged in sequence along the water flow direction.

2. The exhaust gas treatment device according to claim 1, characterized in that: The tail gas treatment device further comprises: a first water supply branch pipe, the first water supply branch pipe being connected in parallel with the water supply main pipe, and a second control valve, a water cooler and a third control valve being arranged in sequence on the first water supply branch pipe in the direction of water flow; The second control valve, the water cooler and the third control valve are connected in parallel with the first control valve, and the second control valve, the water cooler and the third control valve are connected in series with the control regulating valve.

3. The exhaust gas treatment device according to claim 1, characterized in that: The tail gas treatment device further comprises: A second water supply branch pipe, one port of the second water supply branch pipe is connected to the water supply main pipe, and the other port of the second water supply branch pipe is used for receiving washing desalted water.

4. The exhaust gas treatment device according to claim 3, characterized in that: A booster pump and a fourth control valve are sequentially arranged on the second water supply branch pipe in the direction of water flow; The booster pump is connected in series with the fourth control valve.

5. The exhaust gas treatment device according to claim 3, characterized in that: The tail gas treatment device further comprises: A return branch pipe, the return branch pipe is connected in parallel with the second water supply branch pipe; The reflux branch pipe is provided with a booster pump reflux valve, and the booster pump reflux valve is connected in parallel with the booster pump.

6. The exhaust gas treatment device according to claim 1, characterized in that: The control valve is used to regulate water flow.

7. The exhaust gas treatment device according to claim 2, characterized in that: The material of the water supply main includes high temperature resistant material and low temperature resistant material; The material of the first water supply branch pipe includes high temperature resistant material and low temperature resistant material.

8. The exhaust gas treatment device according to claim 1, characterized in that: The washing tower has a liquid inlet and a liquid outlet, wherein the liquid inlet is connected to the water supply main, and the liquid outlet is used to discharge the washing liquid.

9. The exhaust gas treatment device according to claim 8, characterized in that: The washing tower also has an air inlet and an air outlet, and the air inlet is used to receive chemical tail gas.

10. A methanol synthesis tail gas treatment system, characterized in that: include: Tail gas treatment unit and secondary pressure boiler; The exhaust gas treatment device is the exhaust gas treatment device according to any one of claims 1 to 9; The secondary pressure boiler is connected to the washing tower through the water supply main pipe or is connected to the washing tower through the cooperation of the water supply main pipe and the first water supply branch pipe.

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