Structure for measuring PH value of slurry of calcium desulfurization absorption tower

Abstract

The utility model provides a calcium desulfurization absorption tower slurry PH value measuring structure which comprises a circulating tank and an absorption tower, the top surface of the circulating tank is fixedly connected with the absorption tower, the outer side surface of the circulating tank is fixedly connected with a circulating pump, the outer side surface of the absorption tower is fixedly connected with a circulating pipeline, and the outer side surface of the circulating tank is fixedly connected with a stirrer. The outer side surface of the circulating tank is fixedly connected with a liquid taking pipe, the outer side surface of the liquid taking pipe is fixedly connected with a valve, the bottom of the liquid taking pipe is provided with a liquid receiving box, the outer side surface of the liquid receiving box is provided with an overflow port, the inner side surface of the liquid receiving box is provided with a PH electrode, the pipe diameter of a connecting part is increased, slurry in the tower is led out, and the liquid receiving box is additionally arranged outside; the PH value of the continuously and circularly flowing slurry is measured and is remotely transmitted to a central control system, lime slurry does not block a pipe, a motor is convenient to clean and calibrate at any time, the accuracy of measured data is ensured, and the production confusion caused by large PH value error is solved.

Description

Technical Field

[0001] The utility model relates to the technical field related to calcium process desulfurization absorption tower slurry, in particular to a calcium process desulfurization absorption tower slurry pH value measurement structure. Background Art

[0002] The limestone-gypsum wet flue gas desulfurization process mainly uses cheap and easily available limestone as a desulfurization absorbent. Limestone powder is mixed with water to form an absorbent slurry. In the absorption tower, the absorption slurry contacts and mixes with the flue gas. The sulfur dioxide in the flue gas is absorbed and reacts chemically with the calcium hydroxide in the slurry and the oxidizing air blown in. The final product is gypsum. The desulfurized flue gas passes through the demister to remove the droplets and then enters the chimney for discharge.

[0003] The reaction of limestone-gypsum flue gas desulfurization includes absorption, dissolution, neutralization, oxidation and crystallization. The principle is as follows:

[0004] Absorption: SO2(g)→SO2(l)+H2O→H++HSO3-→H++SO32-

[0005] Dissolution: CaCO3(s)+H+→Ca2++HCO3-

[0006] Neutralization: HCO3-+H+→CO2(g)+H2O

[0007] Oxidation: HSO3-+1 / 2O2→SO32-+H+

[0008] SO32-+1 / 2O2→SO42-

[0009] Crystallization: Ca2++SO32-+1 / 2H2O→CaSO3·1 / 2H2O(s)

[0010] Ca2++SO42-+2H2O→CaSO4·2H2O(s)

[0011] During use, measuring the pH value of the slurry in the absorption tower is the most important indicator for controlling slurry replenishment and discharge and an important basis for guiding production. The conventional measurement method is to set a measuring port on the tower arm, connect the test electrode to the measuring port and contact the medium in the tower for direct measurement. Its structure includes a measuring threaded short pipe, a connecting valve, and a pH electrode that transmits the pH value to the DCS through a pH transmitter. There is a problem with this measurement method. The lead-out pipe is prone to scaling without a stirring device, resulting in distortion of the pH value measurement. There is frequent disassembly, cleaning and calibration work, so a calcium desulfurization absorption tower slurry pH value measurement structure is particularly needed.

[0012] However, in the existing calcium-based desulfurization absorber slurry pH value measurement structure, most of the calcium-based desulfurization absorber slurry pH value measurement structures have no stirring device in the lead-out pipe during use, which is prone to scaling and causes distortion of pH value measurement. Utility Model Content

[0013] The purpose of the utility model is to provide a calcium desulfurization absorption tower slurry pH value measurement structure to solve the existing calcium desulfurization absorption tower slurry pH value measurement structure proposed in the above background technology. During use, the pH value of the slurry in the absorption tower is measured to control the slurry replenishment and discharge and is an important basis for guiding production. The conventional measurement method is to set a measuring port on the tower arm, and the test electrode is connected to the measuring port to contact the medium in the tower for direct measurement. Its structure includes a measuring threaded short pipe, a connecting valve, and a pH electrode that is remotely transmitted to the DCS through a pH transmitter. There is a problem with this measurement method. There is no stirring device at the lead-out pipe, which is easy to scale, causing distortion of the pH value measurement, and there are problems of frequent disassembly, cleaning and calibration.

[0014] To achieve the above-mentioned purpose, the utility model provides a calcium-based desulfurization absorption tower slurry pH value measurement structure, comprising a circulation tank and an absorption tower, the top surface of the circulation tank is fixedly connected to the absorption tower, the outer surface of the circulation tank is fixedly connected to the circulation pump, the outer surface of the absorption tower is fixedly connected to the circulation pipeline, the outer surface of the circulation tank is fixedly connected to the stirrer, the outer surface of the circulation tank is fixedly connected to the liquid collection pipe, the outer surface of the liquid collection pipe is fixedly connected to the valve, the bottom of the liquid collection pipe is installed with a liquid receiving box, the outer surface of the liquid receiving box is provided with an overflow port, and the inner surface of the liquid receiving box is installed with a pH electrode.

[0015] Preferably, the top surface of the absorption tower is provided with an output port for flue gas input, and the outer surface of the circulation tank is provided with an output port for flue gas output.

[0016] Preferably, the output end of the circulation pump is fixedly connected to the circulation pipeline, the output end of the circulation pump penetrates to the inner surface of the circulation tank, and the circulation pipeline penetrates to the inner surface of the absorption tower.

[0017] Preferably, the number of the agitators is three, the agitators are distributed in a ring shape on the outer surface of the circulation tank, and the output ends of the agitators penetrate to the inner surface of the circulation tank.

[0018] Preferably, the liquid extraction pipe penetrates to the inner surface of the circulation tank, and both ends of the valve are fixedly connected to the liquid extraction pipe.

[0019] Preferably, the overflow port passes through the liquid receiving box.

[0020] Compared with the prior art, the utility model has the following beneficial effects: increasing the pipe diameter of the connecting part, leading out the slurry in the tower, adding a liquid receiving box on the outside, setting an overflow port to discharge the liquid to the pulping pool, fixing the pH electrode in the liquid receiving box, measuring the pH value of the continuously circulating slurry and transmitting it remotely to the central control system, eliminating the pipe blockage caused by lime slurry, facilitating the cleaning and calibration of the motor at any time, ensuring the accuracy of the measurement data, and solving the production confusion caused by large pH value errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the circulation tank and the liquid extraction pipe cooperating with each other in the utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the liquid receiving box and the overflow port cooperating with each other in the utility model;

[0024] In the figure: 1. Circulation tank; 2. Absorption tower; 3. Circulation pump; 4. Circulation pipeline; 5. Mixer; 6. Liquid collection pipe; 7. Valve; 8. Liquid receiving box; 9. Overflow port; 10. PH electrode. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the implementation regulations described are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-3The utility model provides a structure for measuring pH value of slurry in a calcium desulfurization absorption tower: it comprises a circulation tank 1 and an absorption tower 2, the top surface of the circulation tank 1 is fixedly connected with the absorption tower 2, the outer surface of the circulation tank 1 is fixedly connected with a circulation pump 3, the outer surface of the absorption tower 2 is fixedly connected with a circulation pipeline 4, the outer surface of the circulation tank 1 is fixedly connected with a stirrer 5, the outer surface of the circulation tank 1 is fixedly connected with a liquid taking pipe 6, the outer surface of the liquid taking pipe 6 is fixedly connected with a valve 7, a liquid receiving box 8 is installed at the bottom of the liquid taking pipe 6, an overflow port 9 is opened on the outer surface of the liquid receiving box 8, and a pH electrode 10 is installed on the inner surface of the liquid receiving box 8. During use, the circulation tank 1 is used as a circulation container for the slurry to provide a closed environment so that the slurry can circulate in the system, the absorption tower 2 performs calcium desulfurization inside to absorb sulfur dioxide in the flue gas, is connected to the circulation tank 1, the slurry reacts in the absorption tower 2, and the circulation pump 3 is used in conjunction with the circulation pipeline 4 to transfer the slurry The slurry is fed from the circulation tank 1 to the absorption tower 2 to ensure that the slurry is fully contacted and reacted in the absorption tower 2. The stirrer 5 is installed in the circulation tank 1 to stir the slurry and maintain the uniformity of the slurry to improve the reaction efficiency. The liquid taking pipe 6 takes out the slurry from the circulation tank 1 and is used to control the flow of the liquid taking pipe 6 through the valve 7. The flow rate of the slurry can be adjusted to measure and adjust the pH value. The liquid receiving box 8 receives the slurry taken out from the liquid taking pipe 6 and is used to control the liquid level in the liquid receiving box 8 and keep the slurry flowing through the overflow port 9 to provide samples for the measurement of the pH value. The pH electrode 10 installed in the liquid receiving box 8 is used to measure the pH value of the slurry and provide feedback information for adjusting the pH value. The slurry in the tower is led out by increasing the pipe diameter of the connection part. The large diameter pipeline reduces the risk of precipitation and siltation and reduces the possibility of scaling inside the pipeline, which helps to maintain the smooth flow of the pipeline, avoid fluid flow obstruction, and improve the stability of the system.

[0027] Furthermore, an output port for flue gas input is provided on the top surface of the absorption tower 2, and an output port for flue gas output is provided on the outer surface of the circulation tank 1.

[0028] Furthermore, the output end of the circulation pump 3 is fixedly connected to the circulation pipe 4, the output end of the circulation pump 3 penetrates to the inner surface of the circulation tank 1, and the circulation pipe 4 penetrates to the inner surface of the absorption tower 2. In the absorption tower 2, the absorption slurry contacts and mixes with the flue gas, and the desulfurized flue gas passes through the demister to remove droplets and then enters the output port in the absorption tower 2 for discharge.

[0029] Furthermore, the number of the agitators 5 is three, and the agitators 5 are distributed in a ring on the outer surface of the circulation tank 1. The output end of the agitator 5 passes through the inner surface of the circulation tank 1. By arranging the agitators 5 on the outer side of the circulation tank 1 and distributing them in a ring, all-round and uniform stirring of the slurry can be achieved. The output end of each agitator 5 passes through the circulation tank 1, ensuring that the liquid in the entire tank is affected by the stirring, preventing the generation of dead corners, and thus improving the stirring effect.

[0030] Furthermore, the liquid taking pipe 6 penetrates the inner surface of the circulation tank 1, and both ends of the valve 7 are fixedly connected to the liquid taking pipe 6. The setting of the valve 7 allows the flow of the fluid in the liquid taking pipe 6 to be controlled. By adjusting the opening and closing degree of the valve 7, the flow rate and flow rate of the fluid can be flexibly controlled, which helps to accurately control the liquid taking speed of the slurry in the circulation tank 1.

[0031] Furthermore, the overflow port 9 runs through the liquid receiving box 8, and the pH electrode 10 is directly fixed in the liquid receiving box 8, which can continuously measure the pH value in the flowing slurry and monitor the acidity and alkalinity of the reaction system in real time. If the pH value deviates from the set range, the system can quickly make adjustments to achieve automatic pH control. This helps to reduce the need for human intervention and improve production efficiency.

[0032] Working principle: The lime slurry in the circulation tank 1 is led out through the liquid taking pipe 6, and is continuously connected to the liquid receiving box 8 and the flow is controlled by the valve 7, so that the liquid in the liquid receiving box 8 is continuously discharged through the overflow port 9. The pH electrode 10 is fixed in the liquid receiving box 8, and the pH value of the liquid receiving box 8 and the lime slurry is continuously measured. The pH electrode 10 is connected to the transmitter, and the measurement signal is transmitted to the control system. In this way, a pH value measurement structure for the slurry in the calcium desulfurization absorption tower is completed.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the implementation rules without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A calcium process desulfurization absorption tower slurry pH value measurement structure, comprising a circulation tank (1) and an absorption tower (2), characterized in that: The top surface of the circulation tank (1) is fixedly connected to an absorption tower (2), the outer surface of the circulation tank (1) is fixedly connected to a circulation pump (3), the outer surface of the absorption tower (2) is fixedly connected to a circulation pipeline (4), the outer surface of the circulation tank (1) is fixedly connected to a stirrer (5), the outer surface of the circulation tank (1) is fixedly connected to a liquid collection pipe (6), the outer surface of the liquid collection pipe (6) is fixedly connected to a valve (7), a liquid receiving box (8) is installed at the bottom of the liquid collection pipe (6), an overflow port (9) is provided on the outer surface of the liquid collection box (8), and a pH electrode (10) is installed on the inner surface of the liquid collection box (8).

2. A calcium desulfurization absorption tower slurry pH value measurement structure according to claim 1, characterized in that: An output port for flue gas input is provided on the top surface of the absorption tower (2), and an output port for flue gas output is provided on the outer surface of the circulation tank (1).

3. A calcium desulfurization absorption tower slurry pH value measurement structure according to claim 1, characterized in that: The output end of the circulation pump (3) is fixedly connected to the circulation pipeline (4), the output end of the circulation pump (3) penetrates the inner surface of the circulation tank (1), and the circulation pipeline (4) penetrates the inner surface of the absorption tower (2).

4. A calcium desulfurization absorption tower slurry pH value measurement structure according to claim 1, characterized in that: The number of the stirrers (5) is three. The stirrers (5) are distributed in a ring shape on the outer surface of the circulation tank (1), and the output ends of the stirrers (5) penetrate the inner surface of the circulation tank (1).

5. The structure for measuring pH value of slurry in a calcium desulfurization absorption tower according to claim 1, characterized in that: The liquid extraction pipe (6) penetrates the inner surface of the circulation tank (1), and both ends of the valve (7) are fixedly connected to the liquid extraction pipe (6).

6. A calcium desulfurization absorption tower slurry pH value measurement structure according to claim 1, characterized in that: The overflow port (9) passes through the liquid receiving box (8).

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