Desulfurizing tower cooling device

Abstract

The utility model relates to the technical field of desulfurizing tower cooling, in particular to a desulfurizing tower cooling device which comprises a first low-temperature gas supply part, a first spraying part, a second spraying part and a control part, the first low-temperature gas supply part is used for supplying low-temperature oxygen-free gas into a concentrating section of a desulfurizing tower; the first spraying part is used for extracting a concentrated ammonium sulfate solution of the concentration section of the desulfurizing tower and circularly spraying the concentrated ammonium sulfate solution to the concentration section of the desulfurizing tower; the second spraying part is used for spraying a low-temperature ammonium sulfate solution to the concentration section of the desulfurizing tower; the control part is electrically connected with the first low-temperature gas supply part, the first spraying part and the second spraying part. The utility model solves the problems in the prior art that the cooling mode of the desulfurizing tower is single and the measuring and calculating deviation of a sulfur dioxide emission measuring and calculating device is easily caused.

Description

Technical Field

[0001] The utility model relates to the technical field of desulfurization tower cooling, in particular to a desulfurization tower cooling device. Background Art

[0002] At present, the coal chemical industry mostly uses ammonia desulfurization technology to remove sulfur dioxide from tail gas. As one of the wet desulfurization technologies, ammonia desulfurization has the advantages of high desulfurization efficiency, no solid waste generation, and low energy consumption. It is one of the resource-based desulfurization technologies. In recent years, ammonia desulfurization technology has been encouraged by relevant departments and has been rapidly promoted and applied in my country.

[0003] Ammonia desulfurization technology uses ammonia water to react with sulfur dioxide in flue gas to generate ammonium aminosulfate and ammonium aminosulfate. The liquid containing ammonium sulfite is then oxidized with oxygen to oxidize ammonium sulfite into ammonium sulfate to form a dilute ammonium sulfate solution. After the dilute ammonium sulfate solution is further concentrated in the absorption tower, an ammonium sulfate slurry (concentrated ammonium sulfate solution) with a certain specific gravity is obtained.

[0004] During actual operation, when the load of the desulfurization system increases, the temperature of the original flue gas is high, and the circulating pump outlet nozzle is blocked, the temperature of the concentration section of the desulfurization tower will increase, affecting the desulfurization efficiency; excessive temperature will also lead to increased aerosol and ammonia escape, and even cause environmental protection emission data to exceed the standard.

[0005] The existing cooling measures are mainly: introducing cooling air into the flue at the entrance of the desulfurization tower to control the flue gas temperature entering the desulfurization tower, but increasing the amount of cooling air in the flue will lead to excessive oxygen content in the tail gas. Since the existing sulfur dioxide emission measurement device is calculated based on the oxygen content, this will increase the sulfur dioxide conversion value in the outlet net flue gas, which will lead to a large measurement deviation and easy misreporting. At the same time, the existing desulfurization tower cooling method is single and does not meet the cooling needs under various working conditions and temperatures. Utility Model Content

[0006] In response to the above problems, the present application provides a desulfurization tower cooling device, which solves the problem in the prior art that the desulfurization tower cooling mode is single and easily causes measurement deviation of the sulfur dioxide emission measurement device.

[0007] To achieve the purpose of this application, this application provides the following technical solutions:

[0008] The utility model provides a desulfurization tower cooling device, comprising:

[0009] The first low-temperature gas supply part is used to supply low-temperature oxygen-free gas to the concentration section of the desulfurization tower;

[0010] The first spraying section is used to extract the concentrated ammonium sulfate solution from the desulfurization tower concentration section and circulate and spray it to the desulfurization tower concentration section;

[0011] The second spraying section is used to spray low-temperature ammonium sulfate solution to the concentration section of the desulfurization tower;

[0012] The control part is electrically connected to the first low-temperature gas supply part, the first spray part and the second spray part respectively.

[0013] According to the desulfurization tower cooling device provided by the utility model, the first spray part and the second spray part are connected and arranged, and a fourth solenoid valve is also arranged between the first spray part and the second spray part, and the fourth solenoid valve is electrically connected to the control part.

[0014] According to the desulfurization tower cooling device provided by the utility model, the first low-temperature gas supply part includes: a first low-temperature gas pipe and a first solenoid valve, the first solenoid valve is arranged on the first low-temperature gas pipe and is electrically connected to the control part, and the first low-temperature gas pipe is connected to the desulfurization tower flue.

[0015] According to the desulfurization tower cooling device provided by the utility model, the first spray part includes:

[0016] A circulation pump, the liquid inlet of which is connected to the concentrated ammonium sulfate solution in the concentration section of the desulfurization tower, and the circulation pump is also electrically connected to the control unit;

[0017] The first nozzle is arranged in the concentration section of the desulfurization tower and is connected with the liquid outlet of the circulation pump.

[0018] According to the desulfurization tower cooling device provided by the utility model, the second spray part includes:

[0019] a second solenoid valve, one end of which is connected to a source of low-temperature ammonium sulfate solution, and the second solenoid valve is also electrically connected to the control unit;

[0020] A second nozzle is disposed in the concentration section of the desulfurization tower and is connected to the other end of the second solenoid valve;

[0021] The liquid outlet end of the fourth solenoid valve is communicated with the liquid outlet end of the second solenoid valve.

[0022] The desulfurization tower cooling device provided by the utility model further includes: a second low-temperature gas supply part for supplying low-temperature air to the concentration section of the desulfurization tower;

[0023] The second low-temperature gas supply unit includes: a second low-temperature gas pipe and an air valve, the second low-temperature gas pipe is connected to the flue of the desulfurization tower, the air valve is arranged on the second low-temperature gas pipe, and the air valve is electrically connected to the control unit.

[0024] The desulfurization tower cooling device provided by the utility model further includes: a cooling water pipe and a fifth solenoid valve, wherein the fifth solenoid valve is arranged on the cooling water pipe and is electrically connected to the control unit;

[0025] The cooling water pipe is communicated with a cooling water source.

[0026] According to the desulfurization tower cooling device provided by the utility model, the low-temperature gas in the first low-temperature gas supply part is carbon dioxide tail gas generated by low-temperature methanol washing.

[0027] According to the desulfurization tower cooling device provided by the utility model, the control unit includes a temperature controller.

[0028] The utility model provides a desulfurization tower cooling device. Through the arrangement of the first low-temperature gas supply part, non-oxygen low-temperature gas can be effectively introduced into the desulfurization tower. The low-temperature gas does not react with the ammonium sulfate solution, so the interior of the desulfurization tower can be cooled in time without affecting the oxygen content inside the desulfurization tower. In this way, the calculation result of the sulfur dioxide emission calculation device can be not affected while cooling.

[0029] Through the setting of the first spray part, the concentrated ammonium sulfate solution in the concentration section of the desulfurization tower can be circulated and sprayed to exchange heat with the air and continuously cool down; through the setting of the second spray part, low-temperature ammonium sulfate solution can be obtained from the outside, and the temperature of the concentration section of the desulfurization tower can be integrated intermittently. At the same time, combined with the first spray part, a combined spraying method of continuous circulation spraying and intermittent spraying can be realized to further achieve the purpose of cooling, meeting the cooling requirements under various working conditions and temperatures; in addition, the second spray part realizes the step spraying of ammonium sulfate solution, which increases the contact area of ​​sulfur dioxide absorption gas and liquid, and improves the desulfurization efficiency of the desulfurization tower. Through the setting of the control part, automatic control of the first low-temperature gas supply part, the first spray part and the second spray part can be realized.

[0030] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application.

[0032] Figure 1 A schematic diagram of the structure of a desulfurization tower cooling device and a desulfurization tower provided in an embodiment of the present application;

[0033] Figure 2 Schematic diagram of electrical connection between the temperature controller and each solenoid valve provided in an embodiment of the present application.

[0034] Reference numerals:

[0035] 1. Desulfurization tower body; 2. Desulfurization tower flue; 3. Control unit; 4. Desulfurization tower concentration section; 5. Cooling water pipe; 6. Fifth solenoid valve; 7. Second low-temperature gas pipe; 8. Air valve; 9. Flue flushing water pipe; 10. First low-temperature gas pipe; 11. Hand valve; 12. First solenoid valve; 13. First nozzle; 14. Fourth solenoid valve; 15. Circulation pump; 16. Second nozzle; 17. Second solenoid valve. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of this application, unless otherwise specified, "plurality" means two or more.

[0038] In order to solve the above technical problems, the utility model proposes the following technical solutions and corresponding embodiments.

[0039] Combine the following Figure 1 and Figure 2 The embodiment shown describes the technical solution of the utility model:

[0040] like Figure 1 As shown, an embodiment of the utility model provides a desulfurization tower cooling device, including: a first low-temperature gas supply part, a first spray part, a second spray part and a control part 3, wherein the first low-temperature gas supply part is used to supply low-temperature oxygen-free gas to the desulfurization tower concentration section 4; the first spray part is used to extract concentrated ammonium sulfate solution from the desulfurization tower concentration section 4, and circulate and spray it to the desulfurization tower concentration section 4; the second spray part is used to spray the low-temperature ammonium sulfate solution to the desulfurization tower concentration section 4; the control part 3 is electrically connected to the first low-temperature gas supply part, the first spray part and the second spray part respectively.

[0041] In some embodiments, the low-temperature oxygen-free gas may be carbon dioxide at 12°C to 20°C, or an inert gas below 20°C; the control unit 3 may preferably be a module assembly with a temperature sensor and a solenoid valve controller. In this way, the first spray unit can be controlled to be normally open for cyclic spraying; the second spray unit can be controlled to obtain a low-temperature (below 20°C) dilute ammonium sulfate solution from the outside, and intermittently combine it with the high-temperature concentrated ammonium sulfate solution in the desulfurization tower concentration section 4. The control unit is in an interlocking logical relationship with the first low-temperature gas supply unit, the first spray unit, and the second spray unit.

[0042] Therefore, a desulfurization tower cooling device provided by an embodiment of the utility model can effectively introduce non-oxygen low-temperature gas into the desulfurization tower through the setting of the first low-temperature gas supply part, which does not react with the ammonium sulfate solution, so the inside of the desulfurization tower can be cooled in time without affecting the oxygen content inside the desulfurization tower, so that the calculation result of the sulfur dioxide emission measurement device can be not affected while cooling; through the setting of the first spray part, the concentrated ammonium sulfate solution in the desulfurization tower concentration section 4 can be circulated and sprayed to exchange heat with the air and continuously cool down; through the setting of the second spray part, the low-temperature ammonium sulfate solution can be obtained from the outside, and the temperature of the desulfurization tower concentration section 4 can be intermittently integrated, and at the same time, combined with the first spray part, a combined spraying mode of continuous cyclic spraying and intermittent spraying can be realized to further achieve the purpose of cooling, and meet the cooling requirements under various working conditions and temperatures; through the setting of the control part 3, automatic control of the first low-temperature gas supply part, the first spray part and the second spray part can be realized. After the cooling air exits, the fan load is reduced, which is beneficial to extending the service life of the equipment. If the fan is a variable frequency fan, it can also reduce the system power consumption.

[0043] According to the desulfurization tower cooling device provided by the embodiment of the utility model, Figure 1 As shown, the first spray part and the second spray part are connected, and a fourth electromagnetic valve 14 is also arranged between the first spray part and the second spray part. The fourth electromagnetic valve 14 is electrically connected to the control part 3.

[0044] In some embodiments, the liquid outlet of the first spray part is connected to the liquid outlet of the second spray part through a pipeline, and a fourth solenoid valve 14 is provided at the same time. The fourth solenoid valve 14 can be intermittently switched with the second spray part in a non-logical relationship at the same time, so that when the solenoid valve of the second spray part is closed, the low-temperature dilute ammonium sulfate solution cannot enter the desulfurization tower concentration section. At this time, the fourth solenoid valve 14 is opened, and the concentrated ammonium sulfate solution of the first spray part can be drained to the nozzle of the second spray part, and the concentrated ammonium sulfate solution is sprayed twice to increase the efficiency of heat dissipation and cooling; when it is necessary to inject low-temperature dilute ammonium sulfate solution into the desulfurization tower concentration section, it is only necessary to close the fourth solenoid valve 14 and open the solenoid valve of the second spray part, so that the temperature can be further reduced. It can also avoid the mixing of dilute ammonium sulfate solution and concentrated ammonium sulfate solution of different pressures. The fourth solenoid valve 14 is in an interlocking logic relationship with the control unit 3.

[0045] According to the desulfurization tower cooling device provided by the embodiment of the utility model, Figure 1 As shown, the first low-temperature gas supply unit includes: a first low-temperature gas pipe 10 and a first solenoid valve 12. The first solenoid valve 12 is arranged on the first low-temperature gas pipe 10 and is electrically connected to the control unit 3. The first low-temperature gas pipe 10 is connected to the desulfurization tower flue 2.

[0046] In some embodiments, the first low-temperature gas pipe 10 is connected to the low-temperature carbon dioxide tail gas generated by the low-temperature methanol washing in the factory area, so that the waste gas can be effectively utilized and energy can be saved; the original cooling cold air needs to be compressed and cooled before it can be used, which is costly. The first solenoid valve 12 is arranged on the first low-temperature gas pipe 10 and is in an interlocking logic relationship with the control unit 3.

[0047] According to the desulfurization tower cooling device provided by the embodiment of the utility model, Figure 1 As shown, the first spraying part includes: a circulating pump 15 and a first nozzle 13, wherein the liquid inlet of the circulating pump 15 is connected to the concentrated ammonium sulfate solution in the desulfurization tower concentration section 4, and the circulating pump 15 is also electrically connected to the control unit 3; the first nozzle 13 is arranged in the desulfurization tower concentration section 4, and is connected to the liquid outlet of the circulating pump 15.

[0048] In some embodiments, the control unit 3 can control the circulation pump 15 and the corresponding solenoid valve to be normally open to achieve uninterrupted heat exchange with the air and cooling.

[0049] According to the desulfurization tower cooling device provided by the embodiment of the utility model, Figure 1As shown, the second spray part includes: a second solenoid valve 17 and a second nozzle 16, one end of the second solenoid valve 17 is connected to the low-temperature ammonium sulfate solution source, and the second solenoid valve 17 is also electrically connected to the control unit 3; the second nozzle 16 is arranged in the desulfurization tower concentration section 4, and is connected to the other end of the second solenoid valve 17; the liquid outlet end of the fourth solenoid valve 14 is connected to the liquid outlet end of the second solenoid valve 17.

[0050] In some embodiments, the control unit 3 controls the second solenoid valve 17 to open intermittently, and the opening time is 20 to 30 seconds per hour. In this way, the low temperature (below 20°C) dilute ammonium sulfate solution in the outside intermittently cools the high-temperature concentrated ammonium sulfate solution in the desulfurization tower concentration section 4, and the fourth solenoid valve 14 is in an interlocking logical relationship with the control unit 3.

[0051] According to the desulfurization tower cooling device provided by the embodiment of the utility model, Figure 1 As shown, it also includes: a second low-temperature gas supply part, used to supply low-temperature air to the desulfurization tower concentration section 4; the second low-temperature gas supply part includes: a second low-temperature gas pipe 7 and an air valve 8, the second low-temperature gas pipe 7 is connected to the desulfurization tower flue 2, the air valve 8 is arranged on the second low-temperature gas pipe 7, and the air valve 8 is electrically connected to the control part 3.

[0052] In some embodiments, the second low-temperature gas pipe 7 can be connected to low-temperature air (below 20°C). When the temperature in the desulfurization tower is 62≤TI<80°C, the air valve 8 can be controlled to open to allow low-temperature air to enter, thereby achieving further multiple cooling effects. When cooling, the temperature of the desulfurization tower concentration section 4 can be controlled first by carbon dioxide and the second spray part, and the flue cooling air can be used as a backup measure.

[0053] According to the desulfurization tower cooling device provided by the embodiment of the utility model, Figure 1 As shown, it also includes: a cooling water pipe 5 and a fifth solenoid valve 6, the fifth solenoid valve 6 is arranged on the cooling water pipe 5, and the fifth solenoid valve 6 is electrically connected to the control unit 3; the cooling water pipe 5 is connected to the cooling water source.

[0054] In some embodiments, when the temperature TI in the desulfurization tower is ≥80°C, the fifth solenoid valve 6 is controlled to open so that the accident cooling water can enter, thereby further achieving the purpose of cooling and avoiding the deterioration of the accident.

[0055] According to the desulfurization tower cooling device provided by the embodiment of the utility model, the low-temperature gas in the first low-temperature gas supply part is the carbon dioxide tail gas generated by low-temperature methanol washing.

[0056] In some embodiments, the carbon dioxide produced by the low-temperature methanol washing is the waste gas of the factory, so it can be reused to reduce production costs. Its pressure is 95Kpa, the temperature is 12-20°C, and the flow rate is selected according to the actual needs of the pipeline diameter.

[0057] The low-temperature methanol-washed carbon dioxide tail gas itself has a pressure of 90kPa and is relatively stable compared to the air temperature. It is not affected by the ambient temperature and can achieve multiple cooling functions for the desulfurization tower temperature.

[0058] According to the desulfurization tower cooling device provided by the embodiment of the utility model, Figure 1 As shown, it also includes: a flue flushing water pipe 9, which is connected to an external water source and is used for flushing the flue.

[0059] like Figure 2 As shown, the control method of the controller is:

[0060] During normal operation, the lower the temperature of the desulfurization tower concentration section 4 is below 70°C, the higher the desulfurization efficiency. The manual valve 11 is in a normally open state, and the control unit is in an interlocking logic relationship with the first solenoid valve, the second solenoid valve, the air valve, the fourth solenoid valve, and the fifth solenoid valve. The control method is as follows (the interlocking temperature point can be adjusted according to actual conditions):

[0061] When the temperature controller detects that the temperature TI in the desulfurization tower concentration section 4 is less than 55°C, the first solenoid valve 12 is controlled to open to introduce low-temperature carbon dioxide into the flue;

[0062] When the temperature controller detects that the temperature in the desulfurization tower concentration section 4 is 55≤TI<65°C, it controls the second solenoid valve 17 to open and the fourth solenoid valve 14 to close, and reduces the temperature of the desulfurization tower concentration section 4 through the second spray part;

[0063] When the temperature controller detects that the temperature in the desulfurization tower concentration section 4 is 62≤TI<80℃, the air valve 8 is controlled to open to introduce low-temperature air. The opening of the air valve 8 is automatically adjusted according to the temperature controller;

[0064] When the temperature controller detects that the temperature TI in the desulfurization tower concentration section 4 is ≥80° C., the fifth solenoid valve 6 is controlled to open. At this time, the operator operates according to the accident state.

[0065] The above embodiments are only used to illustrate the technical solution of the present application, but not to limit it. The present application is not limited to the exact structure described above and illustrated in the accompanying drawings, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, various changes and modifications made without departing from the concept of the present application should be deemed to belong to the protection scope of the present application.

Claims

1. A desulfurization tower cooling device, characterized in that: include: The first low-temperature gas supply part is used to supply low-temperature oxygen-free gas to the concentration section of the desulfurization tower; The first spraying section is used to extract the concentrated ammonium sulfate solution from the desulfurization tower concentration section and circulate and spray it to the desulfurization tower concentration section; The second spraying section is used to spray low-temperature ammonium sulfate solution to the concentration section of the desulfurization tower; The control part is electrically connected to the first low-temperature gas supply part, the first spray part and the second spray part respectively.

2. The desulfurization tower cooling device according to claim 1, characterized in that: The first spray part and the second spray part are connected to each other, and a fourth electromagnetic valve is further arranged between the first spray part and the second spray part, and the fourth electromagnetic valve is electrically connected to the control part.

3. The desulfurization tower cooling device according to claim 1, characterized in that: The first low-temperature gas supply unit includes: a first low-temperature gas pipe and a first solenoid valve, wherein the first solenoid valve is arranged on the first low-temperature gas pipe and is electrically connected to the control unit, and the first low-temperature gas pipe is connected to the flue of the desulfurization tower.

4. The desulfurization tower cooling device according to claim 2, characterized in that: The first spraying part comprises: A circulation pump, the liquid inlet of which is connected to the concentrated ammonium sulfate solution in the concentration section of the desulfurization tower, and the circulation pump is also electrically connected to the control unit; The first nozzle is arranged in the concentration section of the desulfurization tower and is connected with the liquid outlet of the circulation pump.

5. The desulfurization tower cooling device according to claim 4, characterized in that: The second spraying part comprises: a second solenoid valve, one end of which is connected to a source of low-temperature ammonium sulfate solution, and the second solenoid valve is also electrically connected to the control unit; A second nozzle is disposed in the concentration section of the desulfurization tower and is connected to the other end of the second solenoid valve; The liquid outlet end of the fourth solenoid valve is communicated with the liquid outlet end of the second solenoid valve.

6. The desulfurization tower cooling device according to claim 1, characterized in that: Also includes: The second low-temperature gas supply part is used to supply low-temperature air to the concentration section of the desulfurization tower; The second low-temperature gas supply unit includes: a second low-temperature gas pipe and an air valve, the second low-temperature gas pipe is connected to the flue of the desulfurization tower, the air valve is arranged on the second low-temperature gas pipe, and the air valve is electrically connected to the control unit.

7. The desulfurization tower cooling device according to claim 1, characterized in that: Also includes: a cooling water pipe and a fifth solenoid valve, wherein the fifth solenoid valve is arranged on the cooling water pipe and is electrically connected to the control unit; The cooling water pipe is communicated with a cooling water source.

8. The desulfurization tower cooling device according to claim 1, characterized in that: The low-temperature gas in the first low-temperature gas supply part is carbon dioxide tail gas generated by low-temperature methanol washing.

9. The desulfurization tower cooling device according to any one of claims 1 to 8, characterized in that: The control unit includes a temperature controller.

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