Control system for SRG flue gas acid-making purification system

Abstract

The invention relates to a control system for an SRG flue gas acid-making purification system, which comprises three detection assemblies, a pollution discharge assembly, a first backflow assembly, a second backflow assembly and a water replenishing assembly, and is characterized in that the three detection assemblies are respectively mounted on circulating parts of a first-stage dynamic wave purification chamber, a filler cooling tower and a second-stage dynamic wave purification chamber; the pollution discharge assembly is installed at the pollution discharge end of the first-stage dynamic wave purification chamber, the liquid inlet end of the first backflow assembly is communicated with the filler cooling tower, the liquid outlet end of the first backflow assembly is communicated with the first-stage dynamic wave purification chamber, the liquid inlet end of the second backflow assembly is communicated with the second-stage dynamic wave purification chamber, and the liquid outlet end of the second backflow assembly is communicated with the filler cooling tower; the water supplementing assembly is used for communicating a water source with the secondary dynamic wave purification chamber; and when the result detected by any detection assembly is in an abnormal state, the pollution discharge assembly is started, the first backflow assembly and the second backflow assembly enable solutions in the first-stage dynamic wave purification chamber, the filler cooling tower and the second-stage dynamic wave purification chamber to be conveyed reversely, and the water supplementing assembly supplements water to the second-stage dynamic wave purification chamber.

Description

Technical Field

[0001] The invention relates to the technical field of steel and chemical industry, and in particular to a control system for an SRG flue gas acid-making purification system. Background Art

[0002] In the activated coke desulfurization and denitrification process widely used in China, the SRG flue gas released through the analysis tower (sulfur dioxide-rich gas produced after sintering flue gas is treated by activated carbon adsorption and analysis process) needs to pass through a purification section composed of a primary power wave, a packed cooling tower and a secondary power wave in sequence to achieve the effect of washing, dust removal, temperature reduction and cooling, and then enter the subsequent acid production section.

[0003] However, in the above purification section, the following situations exist: 1) The dust (mainly activated coke ash) carried in the SRG flue gas is separated from the flue gas through reverse jet washing in the purification section and is enriched in large quantities at the bottom of the purification device (the first-level power wave is the most serious), causing high turbidity of the dilute acid solution in the system. Regular sewage discharge is required to prevent clogging of pipes, nozzles, liquid level meters and other devices.

[0004] 2) The chlorides carried in the SRG flue gas are separated from the flue gas by reverse jet washing in the purification section and are enriched in the dilute acid solution inside the purification device. Moreover, as the amount of scrubbing flue gas increases, the chloride ion concentration in the circulating fluid will continue to increase. If the chloride ion concentration in the equipment and pipeline medium is higher than 7000 mg / L for a long time, the plate heat exchanger made of 254Mo in the purification section will be severely corroded, which will greatly increase the system failure rate and shutdown frequency. In order to reduce equipment corrosion and extend system life, it is necessary to regularly discharge the dilute acid circulating fluid containing high concentration of Cl- and add industrial water to reduce the chloride ion concentration to below the safety limit.

[0005] In summary, during the operation of the SRG flue gas acid purification system, it is necessary to control the turbidity and chloride ion concentration of the dilute acid solution in the system, and manual control is time-consuming and labor-intensive. Summary of the invention

[0006] In view of this, it is necessary to provide a control system for the SRG flue gas acid purification system to solve the problem that during the operation of the SRG flue gas acid purification system, the turbidity and chloride ion concentration of the dilute acid solution in the system need to be controlled, and manual control is time-consuming and labor-intensive.

[0007] The present invention provides a control system for an SRG flue gas acid-making purification system, wherein the SRG flue gas acid-making purification system comprises a primary power wave purification chamber, a packing cooling tower and a secondary power wave purification chamber which are connected in sequence, wherein the bottom and the top of the primary power wave purification chamber, the packing cooling tower and the secondary power wave purification chamber are connected via a circulation component to return the solution at the bottom to the top, wherein the control system comprises three detection components, a sewage discharge component, a first reflux component, a second reflux component and a water replenishment component, wherein the three detection components are respectively installed on the circulation components of the primary power wave purification chamber, the packing cooling tower and the secondary power wave purification chamber to detect the turbidity of the solution and the chloride ion concentration in the solution, and the sewage discharge component It is installed on the discharge end of the first-level power wave purification chamber and is electrically connected to the three detection components, and is used to operate according to the detection results of the three detection components. The liquid inlet end of the first reflux component is connected to the packed cooling tower, and the liquid outlet end is connected to the first-level power wave purification chamber. The first reflux component operates according to the liquid level of the first-level power wave purification chamber. The liquid inlet end of the second reflux component is connected to the second-level power wave purification chamber, and the liquid outlet end is connected to the packed cooling tower. The second reflux component operates according to the liquid level of the packed cooling tower. The liquid inlet end of the water replenishment component is used to connect to the water source, and the liquid outlet end is connected to the second-level power wave purification chamber, and operates according to the liquid level of the second-level power wave purification chamber.

[0008] Furthermore, the three detection components all include a chloride ion concentration detector and a turbidity meter.

[0009] Furthermore, the sewage discharge component is a sewage discharge valve, and when the detection result of any of the detection components is greater than a preset value, the sewage discharge valve opens.

[0010] Further, the first reflux assembly includes a first reflux pipe, a first reflux valve and a first liquid level sensor, the first reflux pipe is connected to the first-stage power wave purification chamber and the packed cooling tower, the first reflux valve is installed on the first reflux pipe, the first liquid level sensor is installed in the first-stage power wave purification chamber and is electrically connected to the first reflux valve, so as to detect the liquid level in the first-stage power wave purification chamber, and when the liquid level in the first-stage power wave purification chamber is lower than a preset value, the first reflux valve is opened; The second reflux assembly includes a second reflux pipe, a second reflux valve and a second liquid level sensor. The second reflux pipe is connected to the packed cooling tower and the secondary dynamic wave purification chamber. The second reflux valve is installed on the second reflux pipe. The second liquid level sensor is installed in the packed cooling tower and is electrically connected to the second reflux valve to detect the liquid level in the packed cooling tower. When the liquid level in the packed cooling tower is lower than a preset value, the second reflux valve opens.

[0011] Furthermore, the water replenishment component includes a water replenishment pipe, a water replenishment valve and a third liquid level sensor, one end of the water replenishment pipe is used to connect to the water source, the other end of the water replenishment pipe is connected to the secondary power wave purification chamber, the water replenishment valve is installed on the water replenishment pipe, the third liquid level sensor is installed in the secondary power wave purification chamber and is electrically connected to the water replenishment valve to detect the liquid level in the secondary power wave purification chamber, and when the liquid level in the secondary power wave purification chamber is lower than a preset value, the water replenishment valve opens.

[0012] Furthermore, the three circulation parts each include a circulation pipe and a circulation pump, the two ends of the three circulation pipes are respectively connected to the bottom and top of the first-level dynamic wave purification chamber, the packed cooling tower and the second-level dynamic wave purification chamber, the three circulation pumps are respectively installed on the three circulation pipes, and the detection ends of the three detection components extend into the three circulation pipes respectively.

[0013] Furthermore, the liquid inlet end of the first reflux component is connected to the packed cooling tower via the circulation pipe, and the liquid inlet end of the second reflux component is connected to the secondary dynamic wave purification chamber via the circulation pipe.

[0014] Furthermore, the three detection components all set the upper limit of the turbidity of the solution to 800 mg / L and the upper limit of the chloride ion concentration in the solution to 7000 mg / L.

[0015] Furthermore, the preset value of the liquid level in the first-stage power wave purification room is 0.4m, the preset value of the liquid level in the packed cooling tower is 0.4m, and the preset value of the liquid level in the second-stage power wave purification room is 0.4m.

[0016] Furthermore, the sewage valve, the reflux valve and the water supply valve are all electric valves.

[0017] Compared with the prior art, three detection components are used to detect the turbidity of the solution in the first-level power wave purification chamber, the packed cooling tower and the second-level power wave purification chamber and the chloride ion concentration in the solution. When the result detected by any detection component is abnormal (that is, the turbidity of the solution and / or the chloride ion concentration in the solution is too high), the sewage discharge component is turned on and the solution in the first-level power wave purification chamber is discharged. As the liquid level in the first-level power wave purification chamber continues to decrease, the first reflux component and the second reflux component reversely transport the solution in the first-level power wave purification chamber, the packed cooling tower and the second-level power wave purification chamber, and the water replenishment component replenishes water to the second-level power wave purification chamber, thereby effectively controlling the turbidity and chloride ion concentration of the solution in the SRG flue gas acid purification system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the SRG flue gas acid purification system; Figure 2A schematic diagram of the overall structure of a control system for an SRG flue gas acid-making purification system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0020] like Figure 1 As shown, the SRG flue gas acid-making purification system is first briefly introduced to facilitate understanding of the working principle of the control system in the present application. The flue gas acid-making purification system includes a primary power wave purification chamber M1, a packed cooling tower M2 and a secondary power wave purification chamber M3 which are sequentially connected. The bottom and top of the primary power wave purification chamber M1, the packed cooling tower M2 and the secondary power wave purification chamber M3 are connected via a circulation component M11 to return the solution at the bottom to the top.

[0021] Specifically, the SRG flue gas enters the first-stage power wave purification chamber M1, and is backwashed. The dust in the flue gas is mixed with the acid solution and enriched at the bottom of the first-stage power wave purification chamber M1. The treated SRG flue gas enters the second-stage power wave purification chamber M3 after being cooled by the packing cooling tower M2 to achieve the second-stage reaction treatment. Among them, the exhaust pipe M13 is installed at the exhaust end of the first-stage power wave purification chamber M1, the packing cooling tower M2 and the second-stage power wave purification chamber M3.

[0022] Among them, the turbidity of the solution at the bottom of the first-stage power wave purification chamber M1 is the highest. At the same time, as the reaction continues, the chloride ion concentration in the solution at the bottom of the first-stage power wave purification chamber M1, the packed cooling tower M2 and the second-stage power wave purification chamber M3 gradually increases. Based on the above situation, the control system in this application is used to control the turbidity of the solution and the concentration of chloride ions in the solution.

[0023] like Figure 2As shown, the present invention provides a control system for an SRG flue gas acid purification system, SRG, wherein the control system includes three detection components 100, a sewage discharge component 200, a first reflux component 300, a second reflux component 400 and a water replenishment component 500, the three detection components 100 are respectively installed on the circulation component M11 of the primary power wave purification chamber M1, the packing cooling tower M2 and the secondary power wave purification chamber M3, for detecting the turbidity of the solution and the chloride ion concentration in the solution, the sewage discharge component 200 is installed on the sewage discharge end M12 of the primary power wave purification chamber M1 and is electrically connected to the three detection components 100, for detecting the turbidity of the solution and the chloride ion concentration in the solution according to the water discharge end M12 of the primary power wave purification chamber M1. The detection results of the three detection components 100 are activated, the liquid inlet end of the first reflux component 300 is connected to the packed cooling tower M2, and the liquid outlet end is connected to the primary power wave purification chamber M1, the first reflux component 300 is activated according to the liquid level of the primary power wave purification chamber M1, the liquid inlet end of the second reflux component 400 is connected to the secondary power wave purification chamber M3, and the liquid outlet end is connected to the packed cooling tower M2, the second reflux component 400 is activated according to the liquid level of the packed cooling tower M2, the liquid inlet end of the water replenishment component 500 is used to connect to the water source, and the liquid outlet end is connected to the secondary power wave purification chamber M3, and is activated according to the liquid level of the secondary power wave purification chamber M3.

[0024] During implementation, the three detection components 100 are used to detect the turbidity of the solution in the first-level power wave purification chamber M1, the packed cooling tower M2 and the second-level power wave purification chamber M3 and the chloride ion concentration in the solution. When the result detected by any detection component 100 is abnormal (that is, the turbidity of the solution and / or the chloride ion concentration in the solution is too high), the sewage discharge component 200 is opened, and the solution in the first-level power wave purification chamber M1 is discharged. As the liquid level in the first-level power wave purification chamber M1 continues to decrease, the first reflux component and the second reflux component reversely transport the solution in the first-level power wave purification chamber M1, the packed cooling tower M2 and the second-level power wave purification chamber M3, and the water replenishment component 500 replenishes water to the second-level power wave purification chamber M3, thereby effectively controlling the turbidity and chloride ion concentration of the solution in the SRG flue gas acid purification system.

[0025] The three detection components 100 in this embodiment all include a chloride ion concentration detector 110 and a turbidity meter 120. The chloride ion concentration detector 110 can be a BPX-321 chloride ion concentration meter, and the turbidity meter 120 can be a MIK-DC2000 monitor, which can replace manual detection of the turbidity and chloride ion concentration of the solution in the SRG flue gas acid purification system.

[0026] The sewage discharge component 200 in this embodiment is a sewage discharge valve. When the detection result of any detection component 100 is greater than a preset value, the sewage discharge valve opens.

[0027] In this embodiment, the first reflux component 300 includes a first reflux pipe 310, a first reflux valve 320 and a first liquid level sensor 330. The first reflux pipe 310 connects the first-stage power wave purification chamber M1 and the packed cooling tower M2. The first reflux valve 320 is installed on the first reflux pipe 310. The first liquid level sensor 330 is installed in the first-stage power wave purification chamber M1 and is electrically connected to the first reflux valve 320 to detect the liquid level in the first-stage power wave purification chamber M1. When the liquid level in the first-stage power wave purification chamber M1 is lower than a preset value, the first reflux valve 320 opens.

[0028] The second reflux component 400 in this embodiment includes a second reflux pipe 410, a second reflux valve 420 and a second liquid level sensor 430. The second reflux pipe 410 connects the packed cooling tower M2 and the secondary dynamic wave purification chamber M3. The second reflux valve 420 is installed on the second reflux pipe 410. The second liquid level sensor 430 is installed in the packed cooling tower M2 and is electrically connected to the second reflux valve 420 to detect the liquid level in the packed cooling tower M2. When the liquid level in the packed cooling tower M2 is lower than a preset value, the second reflux valve 420 opens.

[0029] The water replenishment component 500 in this embodiment includes a water replenishment pipe 510, a water replenishment valve 520 and a third liquid level sensor 530. One end of the water replenishment pipe 510 is used to connect to the water source, and the other end of the water replenishment pipe 510 is connected to the secondary power wave purification chamber M3. The water replenishment valve 520 is installed on the water replenishment pipe 510. The third liquid level sensor 530 is installed in the secondary power wave purification chamber M3 and is electrically connected to the water replenishment valve 520 to detect the liquid level in the secondary power wave purification chamber M3. When the liquid level in the secondary power wave purification chamber M3 is lower than the preset value, the water replenishment valve 520 is opened.

[0030] It can be understood that the three circulation parts M11 each include a circulation pipe M111 and a circulation pump M112. The two ends of the three circulation pipes M111 are respectively connected to the bottom and top of the first-level dynamic wave purification chamber M1, the packed cooling tower M2 and the second-level dynamic wave purification chamber M3. The three circulation pumps M112 are respectively installed on the three circulation pipes M111, and the detection ends of the three detection components 100 extend into the three circulation pipes M111 respectively.

[0031] At the same time, a plate heat exchanger M14 is also installed on the circulation pipe M111 of the packed cooling tower M2.

[0032] In one embodiment, the liquid inlet end of the first reflux assembly 300 is connected to the packed cooling tower M2 via the circulation pipe M111, and the liquid inlet end of the second reflux assembly 400 is connected to the secondary dynamic wave purification chamber M3 via the circulation pipe M111.

[0033] In one embodiment, the three detection components 100 all set the upper limit of the turbidity of the solution to 800 mg / L and the upper limit of the chloride ion concentration in the solution to 7000 mg / L.

[0034] Among them, the preset value of the liquid level in the first-stage power wave purification chamber M1 is 0.4m, the preset value of the liquid level in the packed cooling tower M2 is 0.4m, and the preset value of the liquid level in the second-stage power wave purification chamber M3 is 0.4m.

[0035] To facilitate the control of opening and closing of the drain valve, the return valve 320 and the water replenishment valve 520, in one embodiment, the drain valve, the return valve 320 and the water replenishment valve 520 are all electric valves.

[0036] It can be understood that a controller is also included, and the above-mentioned detection component 100 is connected to the drain valve via the controller. When the result detected by any detection component 100 is greater than the preset value, the controller controls the drain valve to open. At the same time, the first liquid level sensor 330 and the third liquid level sensor 530 are opened via the controller and the return valve 320 and the water supply valve 520. When the first liquid level sensor 330 detects that the liquid level in the first-level power wave purification chamber M1 is lower than the preset value, the controller controls the corresponding return valve 320 to open. Similarly, when the first liquid level sensor 330 detects that the liquid level in the packed cooling tower M2 is lower than the preset value, the controller controls the corresponding return valve 320 to open. When the third liquid level sensor 530 detects that the liquid level in the second-level power wave purification chamber M3 is lower than the preset value, the controller controls the corresponding return valve 320 to open.

[0037] The controller is a structure that can be thought of by a person skilled in the art to control the opening of the valve according to the detection signal, and a controller of model BFC-1C can be used.

[0038] Compared with the prior art: three detection components 100 are used to detect the turbidity of the solution in the first-level power wave purification chamber M1, the packed cooling tower M2 and the second-level power wave purification chamber M3 and the chloride ion concentration in the solution. When the result detected by any detection component 100 is abnormal (that is, the turbidity of the solution and / or the chloride ion concentration in the solution is too high), the sewage discharge component 200 is opened, and the solution in the first-level power wave purification chamber M1 is discharged. As the liquid level in the first-level power wave purification chamber M1 continues to decrease, the first reflux component 300 and the second reflux component 400 reversely transport the solution in the first-level power wave purification chamber M1, the packed cooling tower M2 and the second-level power wave purification chamber M3, and the water replenishment component 500 replenishes water to the second-level power wave purification chamber M3, thereby effectively controlling the turbidity and chloride ion concentration of the solution in the SRG flue gas acid purification system.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A control system for an SRG flue gas acid-making purification system, the SRG flue gas acid-making purification system comprising a primary power wave purification chamber, a packing cooling tower and a secondary power wave purification chamber connected in sequence, the bottom and top of the primary power wave purification chamber, the packing cooling tower and the secondary power wave purification chamber are connected via a circulation member to return the solution at the bottom to the top, characterized in that: include: Three detection components, which are respectively installed on the circulation parts of the first-stage power wave purification chamber, the packing cooling tower and the second-stage power wave purification chamber, for detecting the turbidity of the solution and the chloride ion concentration in the solution; A sewage discharge component, which is installed on the sewage discharge end of the first-stage power wave purification chamber and is electrically connected to the three detection components, and is used to act according to the detection results of the three detection components; A first reflux component, whose liquid inlet end is connected to the packed cooling tower, and whose liquid outlet end is connected to the primary power wave purification chamber, and the first reflux component operates according to the liquid level of the primary power wave purification chamber; a second reflux component, whose liquid inlet end is in communication with the secondary power wave purification chamber and whose liquid outlet end is in communication with the packing cooling tower, and the second reflux component operates according to the liquid level of the packing cooling tower; The water replenishment component has a liquid inlet end for connecting to a water source, and a liquid outlet end connected to the secondary power wave purification chamber, and operates according to the liquid level of the secondary power wave purification chamber.

2. The control system for the SRG flue gas acid purification system according to claim 1, characterized in that: The three detection components all include a chloride ion concentration detector and a turbidity meter.

3. The control system for the SRG flue gas acid purification system according to claim 1, characterized in that: The sewage discharge component is a sewage discharge valve, and when the detection result of any of the detection components is greater than a preset value, the sewage discharge valve opens.

4. The control system for the SRG flue gas acid purification system according to claim 3 is characterized in that: The first reflux assembly includes a first reflux pipe, a first reflux valve and a first liquid level sensor. The first reflux pipe is connected to the first-stage power wave purification chamber and the packed cooling tower. The first reflux valve is installed on the first reflux pipe. The first liquid level sensor is installed in the first-stage power wave purification chamber and is electrically connected to the first reflux valve to detect the liquid level in the first-stage power wave purification chamber. When the liquid level in the first-stage power wave purification chamber is lower than a preset value, the first reflux valve is opened. The second reflux assembly includes a second reflux pipe, a second reflux valve and a second liquid level sensor. The second reflux pipe is connected to the packed cooling tower and the secondary dynamic wave purification chamber. The second reflux valve is installed on the second reflux pipe. The second liquid level sensor is installed in the packed cooling tower and is electrically connected to the second reflux valve to detect the liquid level in the packed cooling tower. When the liquid level in the packed cooling tower is lower than a preset value, the second reflux valve opens.

5. The control system for the SRG flue gas acid purification system according to claim 4 is characterized in that: The water replenishment component includes a water replenishment pipe, a water replenishment valve and a third liquid level sensor. One end of the water replenishment pipe is used to connect to a water source, and the other end of the water replenishment pipe is connected to the secondary power wave purification chamber. The water replenishment valve is installed on the water replenishment pipe. The third liquid level sensor is installed in the secondary power wave purification chamber and is electrically connected to the water replenishment valve to detect the liquid level in the secondary power wave purification chamber. When the liquid level in the secondary power wave purification chamber is lower than a preset value, the water replenishment valve opens.

6. The control system for the SRG flue gas acid purification system according to claim 1, characterized in that: The three circulation parts all include a circulation pipe and a circulation pump. The two ends of the three circulation pipes are respectively connected to the bottom and top of the first-level power wave purification chamber, the packed cooling tower and the second-level power wave purification chamber. The three circulation pumps are respectively installed on the three circulation pipes, and the detection ends of the three detection components extend into the three circulation pipes respectively.

7. The control system for the SRG flue gas acid purification system according to claim 6, characterized in that: The liquid inlet end of the first reflux component is communicated with the packed cooling tower via the circulation pipe, and the liquid inlet end of the second reflux component is communicated with the secondary power wave purification chamber via the circulation pipe.

8. The control system for the SRG flue gas acid purification system according to claim 1, characterized in that: The three detection components all set the upper limit of the turbidity of the solution to 800 mg / L and the upper limit of the chloride ion concentration in the solution to 7000 mg / L.

9. The control system for the SRG flue gas acid purification system according to claim 5, characterized in that: The preset value of the liquid level in the first-stage power wave purification room is 0.4m, the preset value of the liquid level in the packed cooling tower is 0.4m, and the preset value of the liquid level in the second-stage power wave purification room is 0.4m.

10. The control system for the SRG flue gas acid purification system according to claim 5, characterized in that: The sewage valve, the reflux valve and the water supply valve are all electric valves.

Images