Slurry supply system for desulfurization process

Abstract

The utility model provides a slurry supply system for a desulfurization process, which belongs to the technical field of desulfurization, the slurry supply system for the desulfurization process comprises a central control system, a circulating pipe, a slurry tank and a flowmeter, the central control system comprises a console and two sulfur dioxide detectors in communication connection with the console, the two sulfur dioxide detectors are respectively arranged at the smoke inlet and the smoke outlet; a circulating pipe is communicated between the slurry tank and the spraying layer, and a circulating pump is arranged on the circulating pipe; the slurry tank is provided with a liquid supply pipe communicated with the circulating pipe, the discharging end of the liquid supply pipe is located on the liquid inlet side of the circulating pump, and the slurry tank is used for containing lime slurry; the flow meter is arranged on the liquid supply pipe, and the flow meter is in communication connection with the console; wherein the control console is used for controlling the opening and the opening degree of the flow meter according to the measured numerical values of the two sulfur dioxide detectors, and adjusting the flow of the slurry entering the circulating pipe.

Description

Technical Field

[0001] The utility model belongs to the technical field of desulfurization, and in particular relates to a slurry supply system used in a desulfurization process. Background Art

[0002] The desulfurization tower is used to treat flue gas. By spraying slurry, the sulfide content in the flue gas can be reduced to meet emission indicators and avoid environmental pollution. The slurry supply method of the conventional desulfurization tower is to directly send fresh lime slurry into the slurry pool. The fresh lime slurry contacts and mixes with the slurry in the slurry pool at the bottom of the desulfurization tower and then flows back to the spray layer in the desulfurization tower. It is then atomized through the nozzles of the spray layer to fully contact with the flue gas. However, when the sulfur dioxide content in the flue gas entering the desulfurization tower fluctuates greatly, the recycled lime slurry cannot meet the desulfurization needs of the flue gas, which can easily cause the sulfur dioxide emission indicators of the flue gas at the outlet of the desulfurization tower to exceed the standard. Utility Model Content

[0003] The utility model provides a slurry supply system for a desulfurization process, aiming to solve the technical problem that when the sulfur dioxide content fluctuates greatly during the flue gas treatment process in the existing desulfurization tower, the removal effect of the lime slurry in the existing slurry supply pool is prioritized, which easily causes the flue gas emission index to exceed the standard.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is: to provide a slurry supply system for a desulfurization process, which is used to supply slurry to a desulfurization tower, wherein a spray layer and a slurry pool at the bottom of the spray layer are provided inside the desulfurization tower, and a smoke inlet and a smoke outlet are provided on the desulfurization tower, including:

[0005] A central control system, comprising a control console and two sulfur dioxide detectors communicatively connected to the control console, wherein the two sulfur dioxide detectors are respectively arranged at the smoke inlet and the smoke outlet;

[0006] A circulation pipe connected between the slurry pool and the spray layer, and a circulation pump is provided on the circulation pipe;

[0007] A slurry tank, having a liquid supply pipe connected to the circulation pipe, wherein the discharge end of the liquid supply pipe is located at the liquid inlet side of the circulation pump, and the slurry tank is used to contain lime slurry;

[0008] A flow meter, disposed on the liquid supply pipe, the flow meter being communicatively connected with the console;

[0009] The control console controls the opening and opening degree of the flow meter according to the measurement values ​​of the two sulfur dioxide detectors, and adjusts the flow rate of the slurry entering the circulation pipe by adjusting the opening degree of the flow meter.

[0010] In a possible implementation, the spray layer is provided with multiple layers from bottom to top in the desulfurization tower, the number of the circulation pipes is equal to the number of the spray layers and they are connected one-to-one, the number of the liquid supply pipes is equal to the number of the circulation pipes and they are connected one-to-one, and multiple liquid supply pipes share one flow meter.

[0011] In a possible implementation, each of the liquid supply pipes and each of the circulation pipes is provided with an electric regulating valve, and the electric regulating valve on the liquid supply pipe is communicatively connected with the control console.

[0012] In a possible implementation, a stirring mechanism is provided inside the slurry tank.

[0013] In a possible implementation, the stirring mechanism includes:

[0014] A linear module having a drive portion that can move up and down;

[0015] The screen is fixedly connected to the driving part.

[0016] In a possible implementation, the stirring mechanism includes:

[0017] A motor, fixedly connected to the top wall of the slurry tank;

[0018] A stirring shaft, fixedly connected to the output shaft of the motor;

[0019] The blade is fixedly connected to the stirring shaft.

[0020] In a possible implementation, the flow meter is disposed at the liquid inlet end of the liquid supply pipe, the slurry tank further comprises a liquid outlet pipe connected between the flow meter and the slurry tank, a plurality of the liquid outlet pipes are provided in parallel, and each of the liquid outlet pipes is provided with a power pump;

[0021] The number of the liquid outlet pipes is the same as or different from the number of the liquid supply pipes.

[0022] In a possible implementation, each of the liquid outlet pipes is provided with an electrically controlled valve, and the electrically controlled valve is located at the liquid outlet side of the power pump.

[0023] In a possible implementation, the slurry supply system for the desulfurization process further includes a liquid level meter, which is located in the desulfurization tower and is used to detect the liquid level in the slurry pool. The liquid level meter is communicatively connected to the control console.

[0024] In a possible implementation, a switch valve is provided at the bottom of the desulfurization tower, and the switch valve is communicatively connected to a control console, and the control console is used to open the switch valve when the reading of the liquid level meter exceeds a preset value.

[0025] Compared with the prior art, the method adopted in the embodiment of the present application is that during the operation of the desulfurization tower, two sulfur dioxide detectors can try to detect the sulfur dioxide content in the flue gas at the smoke inlet and the smoke outlet of the desulfurization tower. Under normal circumstances, the sulfur dioxide in the flue gas at the smoke outlet needs to be lower than the set value of the emission index. When the value measured by the sulfur dioxide detector at the smoke outlet exceeds the set value of the emission index, the flow meter is turned on to add fresh lime slurry to the circulation pipe; and the opening size of the flow meter is adjusted according to the detection value of the sulfur dioxide detector at the smoke inlet, so as to reasonably introduce fresh lime slurry and control the dosage. The utility model is used for a slurry supply system in a desulfurization process. By real-time monitoring the sulfur dioxide concentrations at the smoke inlet and the smoke outlet of the desulfurization tower, the opening and closing of the flow meter are controlled. By introducing fresh lime slurry into the circulation pipe, the treatment efficiency of sulfur dioxide in the flue gas can be improved, thereby avoiding excessive flue gas at the smoke outlet. By measuring the sulfur dioxide concentration in the flue gas at the smoke inlet, the opening of the flow meter can be adjusted in real time. For example, when the sulfur dioxide content is low, the opening is smaller, and when the content is higher, the opening is larger, thereby avoiding waste of lime slurry and reducing use costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the main structure of a slurry supply system for a desulfurization process provided in Example 1 of the utility model;

[0027] Figure 2 This is a schematic diagram of the internal structure of the slurry tank used in the first embodiment of the present utility model;

[0028] Figure 3 This is a schematic diagram of the internal structure of the slurry tank used in Example 2 of the present utility model.

[0029] Description of reference numerals:

[0030] 10-desulfurization tower; 11-smoke inlet; 12-smoke outlet; 13-spraying layer; 14-slurry pool; 15-liquid level meter; 16-on / off valve;

[0031] 20-central control system; 21-control console; 22-sulfur dioxide detector;

[0032] 30-circulation pipe; 31-circulation pump;

[0033] 40-slurry tank; 41-liquid supply pipe; 42-stirring mechanism; 421-linear module; 422-screen; 423-motor; 424-stirring shaft; 425-blade; 43-liquid outlet pipe; 44-power pump; 45-electric control valve;

[0034] 50-flow meter;

[0035] 60-Electric regulating valve. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] In the claims, specification and the above drawings of the utility model, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0038] In the claims, specification and drawings of the present utility model, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0039] It should be noted that Figure 1 The red arrow in the middle indicates the flow direction of the flue gas, and the black arrow indicates the flow direction of the slurry.

[0040] Please also read Figures 1 to 3 , the slurry supply system for the desulfurization process provided by the utility model is now described. The slurry supply system for the desulfurization process is used to supply slurry to the desulfurization tower 10. The desulfurization tower 10 is provided with a spray layer 13 and a slurry pool 14 located at the bottom of the spray layer 13. The desulfurization tower 10 is provided with a smoke inlet 11 and a smoke outlet 12, including a central control system 20, a circulation pipe 30, a slurry tank 40 and a flow meter 50. The central control system 20 includes a control console 21, two sulfur dioxide detectors 22 that are communicatively connected to the control console 21, and the two sulfur dioxide detectors 22 are respectively arranged at the smoke inlet 11 and the smoke outlet 12; the circulation pipe 30 is connected to the slurry pool 11. 4 and the spray layer 13, a circulation pump 31 is provided on the circulation pipe 30; a slurry tank 40 has a liquid supply pipe 41 connected to the circulation pipe 30, the discharge end of the liquid supply pipe 41 is located at the liquid inlet side of the circulation pump 31, and the slurry tank 40 is used to contain lime slurry; a flow meter 50 is provided on the liquid supply pipe 41, and the flow meter 50 is communicatively connected with the control console 21; wherein the control console 21 controls the opening of the flow meter 50 according to the difference in the measured values ​​of the two sulfur dioxide detectors 22, thereby adjusting the flow rate of the slurry entering the circulation pipe 30.

[0041] Compared with the prior art, the slurry supply system for the desulfurization process provided in this embodiment has two sulfur dioxide detectors 22 that can try to detect the sulfur dioxide content in the flue gas at the smoke inlet 11 and the smoke outlet 12 of the desulfurization tower 10 during the operation of the desulfurization tower 10. Under normal circumstances, the sulfur dioxide in the flue gas at the smoke outlet 12 needs to be lower than the set value of the emission index. When the value measured by the sulfur dioxide detector 22 at the smoke outlet 12 exceeds the set value of the emission index, the flow meter 50 is turned on to add fresh lime slurry to the circulation pipe 30; and the opening size of the flow meter 50 is adjusted by the detection value of the sulfur dioxide detector 22 at the smoke inlet 11, so as to reasonably introduce fresh lime slurry and control the dosage. The utility model is used for the slurry supply system of the desulfurization process, which controls the opening and closing of the flow meter 50 by real-time monitoring the sulfur dioxide concentrations at the smoke inlet 11 and the smoke outlet 12 of the desulfurization tower 10, and improves the treatment efficiency of sulfur dioxide in the flue gas by introducing fresh lime slurry into the circulation pipe 30, thereby avoiding excessive flue gas at the smoke outlet 12; by measuring the sulfur dioxide concentration of the flue gas at the smoke inlet 11, the opening of the flow meter 50 can be adjusted in real time, for example, the opening is smaller when the sulfur dioxide content is lower, and the opening is larger when the content is higher, thereby avoiding the waste of lime slurry and reducing the use cost.

[0042] In some implementations, an improved implementation of the circulation pipe 30 and the liquid supply pipe 41 can be adopted as follows Figure 1 See the structure shown. Figure 1 The spray layer 13 is provided with multiple layers from bottom to top in the desulfurization tower 10. The number of the circulation pipes 30 is equal to the number of the spray layers 13 and they are connected one by one. The number of the liquid supply pipes 41 is equal to the number of the circulation pipes 30 and they are connected one by one. The multiple liquid supply pipes 41 share a flow meter 50. After the flue gas enters the desulfurization tower 10, the treatment efficiency of the flue gas can be improved by setting multiple spray layers 13. Liquid can be supplied to part or all of the circulation pipes 30 through multiple liquid supply pipes 41. According to the sulfur dioxide concentration of the flue gas at the smoke inlet 11, the amount of liquid supplied to the circulation pipe 30 can be adjusted to meet different flue gas treatment requirements, and the use is more flexible.

[0043] In some embodiments, an improved implementation of the liquid supply pipe 41 and the circulation pipe 30 can be as follows: Figure 1 See the structure shown. Figure 1, each liquid supply pipe 41 and each circulation pipe 30 are provided with a 60, and the 60 on the liquid supply pipe 41 is in communication connection with the control console 21. The 60 on the liquid supply pipe 41 is close to the liquid outlet end of the liquid supply pipe 41, and the 60 on the circulation pipe 30 is located at the liquid inlet end of the circulation pipe 30. By providing 60 on both the liquid supply pipe 41 and the circulation pipe 30, only part of the circulation pipe 30 or all the circulation pipes 30 can be opened by controlling the opening and closing number of 60 to meet different flue gas treatment requirements; the control console 21 can automatically open the 60 on the liquid supply pipe 41 and adjust it, and then automatically adjust it according to the sulfur dioxide concentration of the smoke inlet 11 and the smoke outlet 12, reducing labor intensity and making it more convenient to use.

[0044] In some embodiments, an improved embodiment of the slurry tank 40 can be adopted as follows Figures 2 to 3 See the structure shown. Figures 2 to 3 A stirring mechanism 42 is provided inside the slurry tank 40. The stirring mechanism 42 can regularly stir the lime slurry in the slurry tank 40 to prevent the pipeline from being blocked by precipitation, and can also ensure the treatment effect of the flue gas.

[0045] In some embodiments, a specific implementation of the stirring mechanism 42 can be as follows: Figure 3 See the structure shown. Figure 3 The stirring mechanism 42 includes a linear module 421 and a screen 422. The linear module 421 has a driving part that can move up and down; the screen 422 is fixed to the driving part. The driving part is turned on at a fixed time to drive the screen 422 to move up and down in the slurry tank 40. The screen 422 is provided with mesh holes, and the lime slurry passes through the mesh holes to prevent sedimentation.

[0046] In some embodiments, a modified implementation of the stirring mechanism 42 can be as follows: Figure 2 See the structure shown. Figure 2 The stirring mechanism 42 includes a motor 423, a stirring shaft 424 and blades 425. The motor 423 is fixedly connected to the top wall of the slurry tank 40; the stirring shaft 424 is fixedly connected to the output shaft of the motor 423; and the blades 425 are fixedly connected to the stirring shaft 424. The stirring shaft 424 is driven by the motor 423 to rotate, and the stirring shaft 424 drives the blades 425 to stir the lime slurry, which can effectively prevent the lime slurry from settling.

[0047] In some embodiments, an improved embodiment of the slurry tank 40 can be adopted as follows Figure 1 See the structure shown. Figure 1The flow meter 50 is arranged at the liquid inlet end of the liquid supply pipe 41, and the slurry tank 40 further includes a liquid outlet pipe 43 connected between the flow meter 50 and the slurry tank 40. A plurality of liquid outlet pipes 43 are arranged in parallel, and a power pump 44 is arranged on each liquid outlet pipe 43; the number of liquid outlet pipes 43 is the same as or different from the number of liquid supply pipes 41. The plurality of liquid outlet pipes 43 can be arranged to prevent the lime slurry from precipitating and blocking one of the liquid outlet pipes 43, and the plurality of liquid outlet pipes 43 can be used alternately to ensure the normal operation of the desulfurization process.

[0048] In some embodiments, an improved implementation of the above-mentioned liquid outlet pipe 43 can be adopted as follows Figure 1 See the structure shown. Figure 1 Each liquid outlet pipe 43 is provided with an electric control valve 45, and the electric control valve 45 is located at the liquid outlet side of the power pump 44. Different liquid outlet pipes 43 can be switched to work through the electric control valve 45, and the electric control valve 45 can also be connected to the console 21 for automatic control, which is easy to use and has low operation difficulty.

[0049] In some embodiments, an improved implementation of the slurry supply system for the desulfurization process can be adopted as follows: Figure 1 See the structure shown. Figure 1 , and also includes a liquid level meter 15, which is located in the desulfurization tower 10 and is used to detect the liquid level in the slurry pool 14. The liquid level meter 15 is connected to the control console 21. Since the amount of slurry in the slurry pool 14 is constant and is recycled, when new lime slurry is continuously added to the desulfurization tower 10, the slurry level in the slurry pool 14 will gradually rise, and it may cover the smoke inlet 11. Therefore, the slurry level in the slurry pool 14 is measured in real time by the liquid level meter 15, so as to ensure the normal entry of flue gas.

[0050] In some embodiments, an improved embodiment of the above-mentioned desulfurization tower 10 can be adopted as follows Figure 1 See the structure shown. Figure 1 A switch valve 16 is provided at the bottom of the desulfurization tower 10, and the switch valve 16 is connected to the control console 21. The control console 21 is used to open the switch valve 16 when the reading of the liquid level meter 15 exceeds the preset value. Through the linkage between the liquid level meter 15 and the switch valve 16, when there is too much slurry in the slurry pool 14, the switch valve 16 is opened to discharge a part of the old slurry, and the amount of slurry in the slurry pool 14 can be adjusted and regularly updated.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A slurry supply system for a desulfurization process, used for supplying slurry to a desulfurization tower, wherein a spray layer and a slurry pool at the bottom of the spray layer are provided inside the desulfurization tower, and a smoke inlet and a smoke outlet are provided on the desulfurization tower, characterized in that: include: A central control system, comprising a control console and two sulfur dioxide detectors communicatively connected to the control console, wherein the two sulfur dioxide detectors are respectively arranged at the smoke inlet and the smoke outlet; A circulation pipe connected between the slurry pool and the spray layer, and a circulation pump is provided on the circulation pipe; A slurry tank, having a liquid supply pipe connected to the circulation pipe, wherein the discharge end of the liquid supply pipe is located at the liquid inlet side of the circulation pump, and the slurry tank is used to contain lime slurry; A flow meter, disposed on the liquid supply pipe, the flow meter being communicatively connected with the console; The control console controls the opening and opening degree of the flow meter according to the measurement values ​​of the two sulfur dioxide detectors, and adjusts the flow rate of the slurry entering the circulation pipe by adjusting the opening degree of the flow meter.

2. The slurry supply system for desulfurization process according to claim 1, characterized in that: The spray layer is arranged in multiple layers from bottom to top in the desulfurization tower, the number of the circulation pipes is equal to the number of the spray layers and they are connected one-to-one, the number of the liquid supply pipes is equal to the number of the circulation pipes and they are connected one-to-one, and multiple liquid supply pipes share one flow meter.

3. The slurry supply system for desulfurization process according to claim 2, characterized in that: Each of the liquid supply pipes and each of the circulation pipes is provided with an electric regulating valve, and the electric regulating valve on the liquid supply pipe is communicatively connected with the control console.

4. The slurry supply system for desulfurization process according to claim 1, characterized in that: A stirring mechanism is arranged inside the slurry tank.

5. The slurry supply system for desulfurization process according to claim 4, characterized in that: The stirring mechanism comprises: A linear module having a drive portion that can move up and down; The screen is fixedly connected to the driving part.

6. The slurry supply system for desulfurization process according to claim 4, characterized in that: The stirring mechanism comprises: A motor, fixedly connected to the top wall of the slurry tank; A stirring shaft, fixedly connected to the output shaft of the motor; The blade is fixedly connected to the stirring shaft.

7. The slurry supply system for desulfurization process according to claim 1, characterized in that: The flow meter is arranged at the liquid inlet end of the liquid supply pipe, and the slurry tank further comprises a liquid outlet pipe connected between the flow meter and the slurry tank, and a plurality of the liquid outlet pipes are arranged in parallel, and each of the liquid outlet pipes is provided with a power pump; The number of the liquid outlet pipes is the same as or different from the number of the liquid supply pipes.

8. The slurry supply system for desulfurization process according to claim 7, characterized in that: Each of the liquid outlet pipes is provided with an electric control valve, and the electric control valve is located at the liquid outlet side of the power pump.

9. The slurry supply system for desulfurization process according to claim 1, characterized in that: The slurry supply system for the desulfurization process also includes a liquid level meter, which is located in the desulfurization tower and is used to detect the liquid level in the slurry pool. The liquid level meter is communicatively connected to the control console.

10. The slurry supply system for desulfurization process according to claim 9, characterized in that: A switch valve is provided at the bottom of the desulfurization tower, and the switch valve is communicatively connected with a control console, and the control console is used to open the switch valve when the indication of the liquid level meter exceeds a preset value.

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