Automatic acid concentration stabilizing device

Abstract

The utility model relates to the technical field of acid concentration stabilization, in particular to an automatic acid concentration stabilizing device. Due to the fact that the first circulation loop, the second circulation loop and the first circulation acid absorption tank are communicated with the first acid feeding pipe through the first adjusting acid pipe, and the drying circulation acid tank is communicated with the second acid feeding pipe through the second adjusting acid pipe, when the sulfuric acid drying tower is used, when the concentration of acid in the sulfuric acid drying tower is low, the sulfuric acid can be recycled. The sulfuric acid can be supplemented to the sulfuric acid drying tower through the drying circulating acid tank or the sulfuric acid can be supplemented to the sulfuric acid drying tower through the primary absorption circulating acid tank; when the acid concentration in the sulfuric acid primary absorption tower is low, the sulfuric acid can be supplemented for the sulfuric acid primary absorption tower through the primary absorption circulating acid tank, and the sulfuric acid can also be supplemented for the sulfuric acid primary absorption tower through the drying circulating acid tank, so that the stability of the acid concentration in the whole device is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of acid concentration stabilization, in particular to an acid concentration automatic stabilization device. Background Art

[0002] In the sulfuric acid dry absorption section, the flue gas from the electrostatic precipitator is scrubbed with 93% sulfuric acid in a countercurrent flow. The concentrated acid absorbs moisture from the flue gas, drying it. The dried flue gas is then conveyed by a fan to the conversion section for conversion. The sulfuric acid, after absorbing water, is continuously diluted. As the acid becomes less concentrated, concentrated acid is added from the primary absorption cycle to maintain the dry acid concentration. The converted flue gas then comes into countercurrent contact with 98% concentrated sulfuric acid sprayed from the top of the primary absorption tower. SO₃ is scrubbed and absorbed into the concentrated acid, which then combines with the water in the concentrated acid to form sulfuric acid. After absorption, the sulfuric acid solution becomes more concentrated. Water is then added or dried and diluted acid is added to maintain the sulfuric acid concentration. The increased acid is cooled and discharged as product acid for storage in the sulfuric acid storage tank. During this cycle, the acid concentration and liquid level in the dry and primary absorption circulating acid tanks must be in dynamic equilibrium; otherwise, production accidents such as equipment corrosion and excessive exhaust gas emissions can occur. The current conventional practice is to maintain a constant acid flow rate and perform manual adjustments from time to time to try to keep the acid concentration and liquid level constant. This is a large workload, unstable control, and prone to abnormal indicators. Utility Model Content

[0003] The present invention aims to solve the problems existing in the prior art by stabilizing the acid concentration in the dry absorption circulation system and the acid level in the circulating acid tank, thereby maintaining the production system within a stable range and thereby maintaining production efficiency at a high level, thereby improving production efficiency and reducing production costs. The present invention provides an automatic acid concentration stabilization device.

[0004] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions:

[0005] An acid concentration automatic stabilization device includes a drying circulating acid tank, a sulfuric acid drying tower, a sulfuric acid absorption tower, an absorption circulating acid tank, multiple valve bodies, a detection system and a control system;

[0006] The drying cycle acid tank is connected to the sulfuric acid drying tower and the sulfuric acid absorption tower through a first upper acid pipe and a second upper acid pipe respectively;

[0007] The sulfuric acid drying tower is connected to the drying circulation acid tank through a first acid return pipe, and the sulfuric acid drying tower, the first acid return pipe, the drying circulation acid tank and the first upper acid pipe form a first circulation loop;

[0008] The sulfuric acid absorption tower is connected to the first absorption circulating acid tank through a second acid return pipe, and the sulfuric acid absorption tower, the second acid return pipe, the first absorption circulating acid tank and the second upper acid pipe form a second circulation loop;

[0009] The first absorption circulating acid tank is connected to the first upper acid pipe through a first regulating acid pipe, and the drying circulating acid tank is connected to the second upper acid pipe through a second regulating acid pipe;

[0010] The plurality of valve bodies are respectively arranged on the first regulating acid pipe and the second regulating acid pipe;

[0011] The control system is respectively connected to the plurality of valve bodies and the detection system, and the detection system includes a flow meter, an acid concentration meter and a liquid level meter;

[0012] The detection system detects and obtains data, and transmits the data to the control system, and the control system controls the opening and closing of the plurality of valve bodies.

[0013] As an improvement to the technical solution of the acid concentration automatic stabilization device of the present invention, the multiple valve bodies include a first electric valve arranged on the first acid regulating pipe and a second electric valve arranged on the second acid regulating pipe.

[0014] As an improvement to the technical solution of the acid concentration automatic stabilization device of the present invention, the detection system includes a first acid concentration meter and a first liquid level meter arranged in the drying circulation acid tank, a second acid concentration meter and a second liquid level meter arranged in the absorption circulation acid tank, and a first flow meter and a second flow meter respectively arranged on the first regulating acid pipe and the second regulating acid pipe.

[0015] As an improvement to the technical solution of the acid concentration automatic stabilization device of the present invention, the first acid concentration meter and the first liquid level meter are both arranged on the upper part of the drying circulation acid tank; the second acid concentration meter and the second liquid level meter are both arranged on the upper part of the absorption circulation acid tank.

[0016] As an improvement of the technical solution of the acid concentration automatic stabilization device of the utility model, the acid concentration automatic stabilization device is used in conjunction with the finished acid storage tank and the tap water network;

[0017] The second upper acid pipe is connected to the first pipe, the second upper acid pipe is connected to the finished acid storage tank through the first pipe, and the first pipe is provided with a third electric valve;

[0018] The first circulating acid absorption tank is connected to a second pipeline, the second pipeline is connected to the tap water network, and a fourth electric valve is provided on the second pipeline.

[0019] As an improvement to the technical solution of the acid concentration automatic stabilization device of the present invention, a drying acid pump is further connected between the sulfuric acid drying tower and the drying circulating acid tank, and an acid absorption pump is further connected between the sulfuric acid absorption tower and the absorption circulating acid tank.

[0020] As an improvement to the technical solution of the acid concentration automatic stabilization device of the present invention, the end of the first upper acid pipe extends into the sulfuric acid drying tower, and the end of the first upper acid pipe is a first spray pipe;

[0021] The end of the second acid supply pipe extends into the sulfuric acid absorption tower, and the end of the second acid supply pipe is a second spray pipe.

[0022] As an improvement to the technical solution of the acid concentration automatic stabilization device of the present invention, the control system is a DCS control system, which includes a DCS controller.

[0023] Beneficial effects of the utility model:

[0024] Since the first circulation loop, the second circulation loop and the first absorption circulating acid tank are connected to the first upper acid tube via the first acid regulating tube, and the drying circulating acid tank is connected to the second upper acid tube via the second acid regulating tube, when the utility model is in use, when the acid concentration in the sulfuric acid drying tower is low, sulfuric acid can be replenished to the sulfuric acid drying tower via the drying circulating acid tank, and sulfuric acid can also be replenished to the sulfuric acid drying tower via the first absorption circulating acid tank; when the acid concentration in the sulfuric acid first absorption tower is low, sulfuric acid can be replenished to the sulfuric acid first absorption tower via the first absorption circulating acid tank, and sulfuric acid can also be replenished to the sulfuric acid first absorption tower via the drying circulating acid tank, so as to ensure the stability of the acid concentration in the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the connection structure of the present utility model.

[0026] Explanation of the accompanying symbols: 1-drying circulating acid tank; 2-sulfuric acid drying tower; 3-sulfuric acid absorption tower; 4-absorption circulating acid tank; 5-first acid supply pipe; 6-second acid supply pipe; 7-first acid return pipe; 8-second acid return pipe; 9-first electric valve; 10-second electric valve; 11-first acid concentration meter; 12-second acid concentration meter; 13-first flow meter; 14-second flow meter; 15-first pipeline; 16-third electric valve; 17-second pipeline; 18-fourth electric valve; 19-drying acid pump; 20-acid absorption pump; 21-first spray pipe; 22-second spray pipe; 23-first acid regulating pipe; 24-second acid regulating pipe; 25-first liquid level gauge; 26-second liquid level gauge. DETAILED DESCRIPTION

[0027] In order to make the purpose of the invention, technical solutions and beneficial effects of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0028] like Figure 1 As shown, an acid concentration automatic stabilization device includes a drying circulating acid tank 1, a sulfuric acid drying tower 2, a sulfuric acid absorption tower 3, an absorption circulating acid tank 4, multiple valve bodies, a detection system and a control system;

[0029] The drying cycle acid tank 1 is connected to the sulfuric acid drying tower 2 and the sulfuric acid absorption tower 3 through the first upper acid pipe 5 and the second upper acid pipe 6 respectively;

[0030] The sulfuric acid drying tower 2 is connected to the drying circulating acid tank 1 through the first acid return pipe 7. The sulfuric acid drying tower 2, the first acid return pipe 7, the drying circulating acid tank 1 and the first upper acid pipe 5 form a first circulation loop;

[0031] The sulfuric acid absorption tower 3 is connected to the first absorption circulating acid tank 4 through the second acid return pipe 8. The sulfuric acid absorption tower 3, the second acid return pipe 8, the first absorption circulating acid tank 4 and the second upper acid pipe 6 form a second circulation loop;

[0032] An absorption circulating acid tank 4 is connected to the first upper acid pipe 5 through a first regulating acid pipe 23, and a drying circulating acid tank 1 is connected to the second upper acid pipe 6 through a second regulating acid pipe 24;

[0033] A plurality of valve bodies are respectively provided on the first regulating acid pipe 23 and the second regulating acid pipe 24;

[0034] The control system is connected to multiple valve bodies and detection systems, which include flow meters, acid concentration meters and liquid level meters;

[0035] The detection system detects and obtains data and transmits the data to the control system, which controls the opening and closing of multiple valve bodies.

[0036] Preferably, the control system is a DCS control system, which includes a DCS controller. The DCS controller is the core component of the DCS system, responsible for receiving, processing and executing instructions and data from various parts of the system. It realizes the monitoring, scheduling, control and management of the production process through a hierarchical, distributed and open architecture. The DCS controller has the characteristics of high reliability, easy scalability, easy maintenance and high integration, and can realize real-time monitoring and fine control of the production process. The DCS controller can monitor various parameters in the industrial process in real time, such as temperature, pressure, liquid level, flow, etc. The real-time collection and analysis of these data helps to promptly detect abnormal situations in the production process. Through pre-set control strategies, the DCS controller can generate corresponding control instructions and send them to the actuator for execution to realize automated control of the industrial process.

[0037] Specifically, the present invention uses a detection system to obtain data on acid concentration, liquid level, and sulfuric acid flow rate. Using these data as variables and multiple valves as control variables, the system implements automatic dual-closed-loop PID control through programmed control of a DCS controller. The acid concentration signal is amplified and controlled through scaling, ensuring stability within a ±0.15% range and preventing signal interference and dead zones.

[0038] In more detail, since the first circulation loop, the second circulation loop and the suction circulating acid tank 4 are connected to the first upper acid pipe 5 through the first acid regulating pipe 23, and the drying circulating acid tank 1 is connected to the second upper acid pipe 6 through the second acid regulating pipe 24, when the utility model is in use, when the acid concentration in the sulfuric acid drying tower 2 is low, sulfuric acid can be replenished to the sulfuric acid drying tower 2 through the drying circulating acid tank 1, and sulfuric acid can also be replenished to the sulfuric acid drying tower 2 through the suction circulating acid tank 4; when the acid concentration in the sulfuric acid absorption tower 3 is low, sulfuric acid can be replenished to the sulfuric acid absorption tower 3 through the suction circulating acid tank 4, and sulfuric acid can also be replenished to the sulfuric acid absorption tower 3 through the drying circulating acid tank 1, so as to ensure the stability of the acid concentration in the entire device.

[0039] The automatic acid concentration stabilization device of the present invention also includes multiple valve bodies, a control system, and a detection system. In some embodiments of the present invention, the multiple valve bodies include a first electric valve 9 and a second electric valve 10. The first electric valve 9 and the second electric valve 10 are correspondingly arranged on the first acid regulating pipe 23 and the second acid regulating pipe 24. The first electric valve 9 and the second electric valve 10 can be used to control the flow of sulfuric acid in the first acid regulating pipe 23 and the second acid regulating pipe 24 respectively, thereby achieving the effect of replenishing sulfuric acid.

[0040] When in use, the detection system can be used to detect the acid concentration, flow rate and liquid level data of sulfuric acid, and obtain the corresponding acid concentration, flow rate and liquid level data, and transmit the obtained data to the control system. When the control system receives the data, it can compare the preset values ​​preset in the control system based on the data, and control the opening and closing of the valve body through the comparison value.

[0041] In some embodiments of the present invention, the detection system includes a first acid concentration meter 11 and a first liquid level meter 25 arranged in a drying circulating acid tank 1, a second acid concentration meter 12 and a second liquid level meter 26 arranged in an absorption circulating acid tank 4, and a first flow meter 13 and a second flow meter 14 respectively arranged on a first regulating acid pipe 23 and a second regulating acid pipe 24.

[0042] Furthermore, the first acid concentration meter 11 and the first liquid level meter 25 are both arranged on the upper part of the drying circulating acid tank 1 ; the second acid concentration meter 12 and the second liquid level meter 26 are both arranged on the upper part of the absorption circulating acid tank 4 .

[0043] During use, the acid concentration data in the drying cycle acid tank 1 and the absorption cycle acid tank 4 are obtained correspondingly through the first acid concentration meter 11 and the second acid concentration meter 12 in the detection system; the liquid level data in the drying cycle acid tank 1 and the absorption cycle acid tank 4 are obtained correspondingly through the first liquid level meter 25 and the second liquid level meter 26 in the detection system; the sulfuric acid flow data on the first regulating acid pipe 23 and the second regulating acid pipe 24 are obtained through the first flow meter 13 and the second flow meter 14 respectively arranged on the first regulating acid pipe 23 and the second regulating acid pipe 24 in the detection system. The detection system obtains the above data and transmits the data to the control system. After receiving the above data, the control system regulates and controls multiple valve bodies to adjust the acid concentration of the sulfuric acid drying tower 2 and the sulfuric acid absorption tower 3.

[0044] In some embodiments of the utility model, the acid concentration automatic stabilization device is used in conjunction with the finished acid storage tank and the tap water network; the second acid pipe 6 is connected to the first pipe 15, and the second acid pipe 6 is connected to the finished acid storage tank through the first pipe 15, and a third electric valve 16 is provided on the first pipe 15; a suction circulating acid tank 4 is connected to a second pipe 17, and the second pipe 17 is connected to the tap water network, and a fourth electric valve 18 is provided on the second pipe 17.

[0045] When in use, the amount of sulfuric acid flowing from the sulfuric acid absorption tower 3 to the finished acid storage tank can be controlled by the third electric valve 16, and the water supply network can be controlled by the fourth electric valve 18 to replenish water through the second pipe 17.

[0046] In some embodiments of the present invention, a drying acid pump 19 is further connected between the sulfuric acid drying tower 2 and the drying circulating acid tank 1, and an acid absorption pump 20 is further connected between the sulfuric acid absorption tower 3 and the absorption circulating acid tank 4. The drying acid pump 19 and the acid absorption pump 20 are both connected to a control system, and the start and stop of the drying acid pump 19 and the acid absorption pump 20 can be controlled by the control system.

[0047] In some embodiments of the present invention, the end of the first acid supply pipe 5 extends into the sulfuric acid drying tower 2, and the end of the first acid supply pipe 5 is the first spray pipe 21;

[0048] The end of the second acid supply pipe 6 extends into the sulfuric acid absorption tower 3 , and the end of the second acid supply pipe 6 is the second spray pipe 22 .

[0049] In some embodiments of the present invention, a DCS control system is programmed to maintain a dry acid concentration at 93.5% ± 0.3%, control an acid concentration from an acid absorption tank at 98.35% ± 0.15% based on the acid concentration, control an acid inlet and tap water volume from a dry acid tank based on the acid concentration, control an acid outlet from an acid absorption tank based on the flow rate and liquid level, and perform PID automatic closed-loop control to stabilize the dry acid volume and liquid level.

[0050] Programming is performed in the DCS system to maintain the acid absorption concentration at 98.35% ± 0.15%. The acid inlet and tap water volume from the drying acid tank are controlled according to the acid concentration. The acid output from the acid absorption tank is controlled according to the flow rate and liquid level. PID automatic closed-loop control is used to stabilize the acid absorption concentration and liquid level.

[0051] In detail, the acid concentration of the sulfuric acid in the sulfuric acid drying tower 2 is generally stable at 93.5% ± 0.3%, and 93.5% ± 0.3% is preset in the control system as the preset value of the sulfuric acid concentration in the sulfuric acid drying tower 2; the acid concentration of the sulfuric acid absorption tower 3 is generally stable at 98.35% ± 0.15%, and 98.35% ± 0.15% is preset in the control system as the preset value of the acid concentration in the sulfuric acid absorption tower 3.

[0052] Through the programming control of the DCS control system, when the sulfuric acid concentration in the sulfuric acid drying tower 2 is high, which here means higher than the preset value of the sulfuric acid concentration, the control system controls the first electric valve 9 to open, and the sulfuric acid in the first suction circulating acid tank 4 enters the sulfuric acid drying tower 2 through the first regulating acid pipe 23, thereby increasing the acid concentration of the sulfuric acid in the sulfuric acid drying tower 2 so that the sulfuric acid drying tower 2 can dry the process gas;

[0053] The sulfuric acid after drying the process gas is returned to the drying circulating acid tank 1 through the first acid return pipe 7. The acid concentration and liquid level in the drying circulating acid tank 1 are monitored in real time by the first acid concentrator 11 and the first liquid level meter 25 installed on the upper portion of the drying circulating acid tank 1. At the same time, the amount of drying acid entering the first absorption circulating acid tank 4 is controlled to increase to maintain a constant liquid level in the first absorption circulating acid tank 4.

[0054] When the concentration of sulfuric acid in the first absorption circulating acid tank 4 is high, which here means higher than the preset value of the first absorption acid concentration, the fourth electric valve 18 is opened to increase the amount of tap water added. At the same time, the acid concentration and liquid level in the first absorption circulating acid tank 4 are detected in real time by the second acid concentration meter 12 and the second liquid level meter 26 provided in the first absorption circulating acid tank 4. The flow rate of sulfuric acid to the finished acid storage tank is controlled according to the liquid level to keep the liquid level of the first absorption circulating acid tank 4 constant. Under the dual closed-loop automatic control of the two circulation tanks, the purpose of automatic stabilization of the acid concentration and constant control of the liquid level is achieved.

[0055] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. An automatic acid concentration stabilization device, characterized in that: It includes a drying circulating acid tank, a sulfuric acid drying tower, a sulfuric acid absorption tower, an absorption circulating acid tank, multiple valve bodies, a detection system and a control system; The drying cycle acid tank is connected to the sulfuric acid drying tower and the sulfuric acid absorption tower through a first upper acid pipe and a second upper acid pipe respectively; The sulfuric acid drying tower is connected to the drying circulation acid tank through a first acid return pipe, and the sulfuric acid drying tower, the first acid return pipe, the drying circulation acid tank and the first upper acid pipe form a first circulation loop; The sulfuric acid absorption tower is connected to the first absorption circulating acid tank through a second acid return pipe, and the sulfuric acid absorption tower, the second acid return pipe, the first absorption circulating acid tank and the second upper acid pipe form a second circulation loop; The first absorption circulating acid tank is connected to the first upper acid pipe through a first regulating acid pipe, and the drying circulating acid tank is connected to the second upper acid pipe through a second regulating acid pipe; The plurality of valve bodies are respectively arranged on the first regulating acid pipe and the second regulating acid pipe; The control system is respectively connected to the plurality of valve bodies and the detection system, and the detection system includes a flow meter, an acid concentration meter and a liquid level meter; The detection system detects and obtains data, and transmits the data to the control system, and the control system controls the opening and closing of the plurality of valve bodies.

2. The acid concentration automatic stabilization device according to claim 1, characterized in that: The plurality of valve bodies include a first electric valve provided on the first regulating acid pipe and a second electric valve provided on the second regulating acid pipe.

3. The acid concentration automatic stabilization device according to claim 1, characterized in that: The detection system includes a first acid concentration meter and a first liquid level meter arranged in the drying circulating acid tank, a second acid concentration meter and a second liquid level meter arranged in the absorption circulating acid tank, and a first flow meter and a second flow meter respectively arranged on the first regulating acid pipe and the second regulating acid pipe.

4. The acid concentration automatic stabilization device according to claim 3, characterized in that: The first acid concentration meter and the first liquid level meter are both arranged on the upper part of the drying circulating acid tank; the second acid concentration meter and the second liquid level meter are both arranged on the upper part of the absorption circulating acid tank.

5. The acid concentration automatic stabilization device according to claim 1, characterized in that: The acid concentration automatic stabilization device is used in conjunction with the finished acid storage tank and the tap water network; The second upper acid pipe is connected to the first pipe, the second upper acid pipe is connected to the finished acid storage tank through the first pipe, and the first pipe is provided with a third electric valve; The first circulating acid absorption tank is connected to a second pipeline, the second pipeline is connected to the tap water network, and a fourth electric valve is provided on the second pipeline.

6. The acid concentration automatic stabilization device according to claim 1, characterized in that: A drying acid pump is further connected between the sulfuric acid drying tower and the drying circulating acid tank, and an acid absorption pump is further connected between the sulfuric acid absorption tower and the absorption circulating acid tank.

7. The acid concentration automatic stabilization device according to claim 1, characterized in that: The end of the first acid supply pipe extends into the sulfuric acid drying tower, and the end of the first acid supply pipe is a first spray pipe; The end of the second acid supply pipe extends into the sulfuric acid absorption tower, and the end of the second acid supply pipe is a second spray pipe.

8. The acid concentration automatic stabilization device according to claim 1, characterized in that: The control system is a DCS control system, which includes a DCS controller.

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