A gas desulfurization treatment system for thermal power generation

Abstract

The invention discloses a gas desulfurization treatment system for thermal power generation, which includes a desulfurization solution tank, a tail gas desulfurization tank and a control system. The desulfurization solution tank includes a tank body, an air inlet end, an exhaust end and a solution input end, and a solution of a sulfur dioxide scavenger is injected into the bottom of the tank body through the solution input end. The tail gas desulfurization tank includes a tank body, an air inlet end, an exhaust end and a frame. The system can systematically treat the tail gas generated after coal combustion in a thermal power plant, thereby improving the efficiency of tail gas desulfurization.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power and relates to a gas desulfurization treatment system for thermal power generation. Background Art

[0002] my country is a country that relies on coal as its main energy source. Coal has always accounted for more than 70% of my country's energy production and consumption. With the rapid development of the economy, coal consumption continues to grow, but with the increase in coal consumption, the amount of sulfur dioxide produced by coal burning is also increasing. my country's annual sulfur dioxide emissions have exceeded 20 million tons. Relevant studies have shown that the economic loss caused by each ton of sulfur dioxide emitted in my country is about 20,000 yuan, which means that the economic loss caused by sulfur dioxide emissions in my country has exceeded 400 billion yuan each year. At the same time, due to the shortage of electricity in the country in recent years, the country has vigorously built new coal-fired power plants. The annual sulfur dioxide waste gas emitted by the thermal power generation industry is about 7.8 million tons, accounting for 39% of the country's annual sulfur dioxide emissions. Therefore, the thermal power generation industry has become one of the important sources of sulfur dioxide pollution in my country's atmospheric environment.

[0003] At present, thermal power plants mainly generate electricity by burning coal. The exhaust gas after combustion contains a large amount of sulfur dioxide gas, so the gas needs to be treated before being discharged into the air. The exhaust gas treatment of existing thermal power plants generally treats the sulfides therein, and the treated exhaust gas is directly discharged. However, the existing treatment method is too single, and it is difficult to carry out systematic treatment of the exhaust gas. Summary of the invention

[0004] To solve the above problems, the present invention provides a gas desulfurization treatment system for thermal power generation, which can systematically treat the tail gas generated after coal combustion in a thermal power plant, thereby improving the efficiency of tail gas desulfurization.

[0005] The invention provides a gas desulfurization processing system for thermal power generation, which comprises a desulfurization solution tank, a tail gas desulfurization tank and a control system.

[0006] The desulfurization solution tank includes a tank body, an air inlet end, an exhaust end and a solution input end. The air inlet end and the exhaust end are installed at the upper end of the tank body, and the solution input end is installed at the lower end of the tank body. The air inlet end is connected to the exhaust gas and the interior of the tank body through a pipeline, and a boost motor and a solenoid valve are installed on the pipeline. The tank body is connected to the pipeline between the solenoid valve and the boost motor through a pipeline, and a solenoid valve is installed on the pipeline, so that a loop is formed between the tank body, the boost motor and the air inlet end. The solution input end inputs the solution through a pipeline, and a solenoid valve is installed on the pipeline. The exhaust end is connected to the exhaust gas desulfurization tank through a pipeline, and a solenoid proportional valve is installed on the pipeline. A pressure sensor and a sulfur dioxide concentration detection sensor are installed on the tank body, and a solution of sulfur dioxide scavenger is injected into the bottom of the tank body through the solution input end.

[0007] The exhaust gas desulfurization box includes a box body, an air inlet end, an exhaust end and a frame. The air inlet end is installed at the upper end of the box body, the exhaust end is installed at the lower end of the box body, and the frame is installed inside the box body. The air inlet end is connected to the exhaust end of the desulfurization solution tank through a pipeline. The frame is installed inside the box body, and sulfur dioxide solid reactant is placed in the frame. The exhaust end is connected to the outside air through a pipeline, and a boost motor and a solenoid valve are installed on the pipeline. The upper end of the box body is connected to the exhaust end pipeline through a pipeline, and a solenoid valve is installed on the pipeline to form a loop between the box body, the boost motor and the pipeline. A pressure sensor and a sulfur dioxide concentration detection sensor are installed on the box body.

[0008] The control system comprises a signal detection module, a digital control module and an analog output module. The signal detection module is connected to the pressure sensor and the sulfur dioxide concentration detection sensor in the desulfurization solution tank and the exhaust gas desulfurization tank. The pressure value and sulfur solubility value in the desulfurization solution tank and the exhaust gas desulfurization tank can be detected through the control system. The digital control module is connected to the digital control module boost motor and the solenoid valve in the desulfurization solution tank and the exhaust gas desulfurization tank. The operation of the boost motor and the solenoid valve can be automatically controlled through the control system. The analog output module can be controlled to be connected to the electromagnetic proportional valve, and the opening degree of the electromagnetic proportional valve can be controlled through the control system.

[0009] Furthermore, the solenoid valve includes a power input port, which is connected to a digital output module in a control system via a connecting line, so that the control system can automatically control the opening or closing of the solenoid valve.

[0010] Furthermore, the electromagnetic proportional valve includes a power input end and a control end. The power input end is connected to a power source to provide power for the electromagnetic proportional valve. The control end is connected to an analog output module of the controller via a connecting line, so that the control system can automatically control the opening degree of the electromagnetic proportional valve.

[0011] Furthermore, the boost motor includes a power input terminal and a control terminal. The power input terminal is connected to the power supply through a connecting line to provide power for the boost motor. The control terminal is connected to the digital output module of the control system through a connecting line, so that the control system can automatically control the operation of the boost motor.

[0012] Furthermore, the pressure sensor includes a detection port and a signal transmission port. The detection port can detect the pressure values ​​in the desulfurization solution tank and the exhaust gas desulfurization tank. The signal transmission port is connected to the signal detection module in the control system through a connecting line, so that the control system can detect the pressure parameter value in the pressure sensor.

[0013] Furthermore, the sulfur dioxide concentration detection sensor includes a detection port and a signal transmission port. The detection port can detect the sulfur concentration value in the air in the desulfurization solution tank and the exhaust gas desulfurization tank. The signal transmission port is connected to the signal detection module in the control system through a connecting line, so that the control system can detect the sulfur dioxide concentration value in the sulfur dioxide concentration detection sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The invention is a schematic diagram of the overall structure of a gas desulfurization treatment system for thermal power generation;

[0015] Figure 2 A schematic diagram of the structure of a desulfurization solution tank for a gas desulfurization treatment system for thermal power generation is invented;

[0016] Figure 3 The invention discloses a structural schematic diagram of a tail gas desulfurization box for a gas desulfurization treatment system for thermal power generation.

[0017] In the figure: 1. desulfurization solution tank; 2. tail gas desulfurization tank; 3. control system; 4. boost motor; 5. solenoid valve; 6. solution input end; 7. sulfur dioxide concentration detection sensor; 8. pressure sensor; 9. solenoid proportional valve; 10. frame. DETAILED DESCRIPTION

[0018] The specific implementation of a gas desulfurization treatment system for thermal power generation will be described in detail below with reference to the accompanying drawings.

[0019] like Figure 1 As shown, the present invention provides a gas desulfurization treatment system for thermal power generation, the system comprising a desulfurization solution tank 1, a tail gas desulfurization tank 2 and a control system 3;

[0020] like Figure 2 As shown, the desulfurization solution tank 1 includes a tank body, an air inlet end, an exhaust end and a solution input end 6, the air inlet end and the exhaust end are installed at the upper end of the tank body, and the solution input end 6 is installed at the lower end of the tank body. The air inlet end is connected to the exhaust gas and the interior of the tank body through a pipeline, and a boost motor 4 and a solenoid valve 5 are installed on the pipeline. The tank body is connected to the pipeline between the solenoid valve 5 and the boost motor 4 through a pipeline, and the solenoid valve 5 is installed on the pipeline, so that a loop is formed between the tank body, the boost motor 4 and the air inlet end. The solution input end 6 inputs the solution through the pipeline, and the solenoid valve 5 is installed on the pipeline. The exhaust end is connected to the exhaust gas desulfurization tank 2 through a pipeline, and an electromagnetic proportional valve 9 is installed on the pipeline. A pressure sensor 8 and a sulfur dioxide concentration detection sensor 7 are installed on the tank body, and a solution of sulfur dioxide scavenger is injected into the bottom of the tank body through the solution input end 6.

[0021] like Figure 3As shown, the tail gas desulfurization box 2 includes a box body, an air inlet end, an exhaust end and a frame 10, the air inlet end is installed at the upper end of the box body, the exhaust end is installed at the lower end of the box body, the frame 10 is installed inside the box body, the air inlet end is connected to the exhaust end of the desulfurization solution box 1 through a pipeline, the frame 10 is installed inside the box body, sulfur dioxide solid reactant is placed in the frame 10, the exhaust end is connected to the outside air through a pipeline, a boost motor 4 and a solenoid valve 5 are installed on the pipeline, the upper end of the box body is connected to the exhaust end pipeline through a pipeline, a solenoid valve 5 is installed on the pipeline, so that a loop is formed between the box body, the boost motor 4 and the pipeline, and a pressure sensor 8 and a sulfur dioxide concentration detection sensor 7 are installed on the box body.

[0022] According to the above, the control system 3 has a signal detection module, a digital control module and an analog output module. The signal detection module is connected to the pressure sensor 8 and the sulfur dioxide concentration detection sensor 7 in the desulfurization solution tank 1 and the exhaust gas desulfurization tank 2. The pressure value and sulfur solubility value in the desulfurization solution tank 1 and the exhaust gas desulfurization tank 2 can be detected through the control system 3. The digital control module is connected to the digital control module boost motor 4 and the solenoid valve 5 in the desulfurization solution tank 1 and the exhaust gas desulfurization tank 2. The operation of the boost motor 4 and the solenoid valve 5 can be automatically controlled through the control system 3. The analog output module can control the connection with the electromagnetic proportional valve 9, and the opening degree of the electromagnetic proportional valve 9 can be controlled through the control system 3.

[0023] According to the above, the solenoid valve 5 includes a power input port, which is connected to a digital output module in the control system 3 through a connecting line, so that the control system 3 can automatically control the opening or closing of the solenoid valve 5.

[0024] According to the above, the electromagnetic proportional valve 9 includes a power input end and a control end. The power input end is connected to the power supply to provide power for the electromagnetic proportion. The control end is connected to the analog output module of the controller through a connecting line, so that the control system 3 can automatically control the opening degree of the electromagnetic proportional valve 9.

[0025] According to the above, the boost motor 4 includes a power input terminal and a control terminal. The power input terminal is connected to the power supply through a connecting line to provide power for the boost motor 4. The control terminal is connected to the digital output module of the control system 3 through a connecting line, so that the control system 3 can automatically control the operation of the boost motor 4.

[0026] According to the above, the pressure sensor 8 includes a detection port and a signal transmission port, the detection port can detect the pressure values ​​in the desulfurization solution tank 1 and the exhaust gas desulfurization tank 2, and the signal transmission port is connected to the signal detection module in the control system 3 through a connecting line, so that the control system 3 can detect the pressure parameter value in the pressure sensor 8.

[0027] According to the above, the sulfur dioxide concentration detection sensor 7 includes a detection port and a signal transmission port, the detection port can detect the sulfur concentration value in the air in the desulfurization solution tank 1 and the exhaust gas desulfurization tank 2, and the signal transmission port is connected to the signal detection module in the control system 3 through a connecting line, so that the control system 3 can detect the sulfur dioxide concentration value in the sulfur dioxide concentration detection sensor 7.

[0028] A control method for a gas desulfurization treatment system for thermal power generation is as follows: the pressure range values ​​and sulfur dioxide concentration range values ​​in the desulfurization solution tank 1 and the tail gas desulfurization tank 2 are respectively set in the control system 3. Since the desulfurization solution tank 1 is a primary desulfurization and the tail gas desulfurization tank 2 is a secondary desulfurization, the pressure range value and sulfur dioxide concentration range value in the desulfurization solution tank 1 are both higher than the pressure range value and sulfur dioxide concentration range value in the tail gas desulfurization tank 2. First, the control system 3 opens the solenoid valve 5 at the solution input end 6 to allow the sulfur dioxide scavenger solution to enter the bottom of the box body of the desulfurization solution tank 1, and then closes the solenoid valve 5. The control system 3 runs the booster motor 4 at the air inlet end of the desulfurization solution tank 1, so that the tail gas enters the bottom of the box body of the desulfurization solution tank 1 from the air inlet end, fully reacts with the sulfur dioxide scavenger solution at the bottom of the box body, and removes the sulfur dioxide in the tail gas. The purged air is at the upper end of the desulfurization solution tank 1, and after the pressure in the box body reaches the range value set by the control system 3, the booster motor 4 is turned off. Since the sulfur dioxide scavenger solution contains a large amount of water, the sulfur dioxide in the exhaust gas cannot react completely in the solution. At this time, the solenoid valve 5 at the air intake end is closed, the solenoid valve 5 in the loop is opened, and the boost motor 4 is operated to circulate the exhaust gas between the box, the boost motor 4 and the air intake end, so that the sulfur dioxide in the exhaust gas reaches the range value set by the control system 3.

[0029] When the desulfurization solution tank 1 needs to replace the solution, the tail gas is cut off from entering the tank, the solenoid valve 5 of the solution input end 6 is opened, and the booster motor 4 is operated to form a circulation with the tank, the solution input end 6 and the external air. Under the pressure of the booster motor 4, the solution in the tank is discharged, and after the solution is discharged, new solution is re-injected to achieve the purpose of replacement.

[0030] When the sulfur dioxide concentration in the exhaust gas reaches the range value set by the control system 3, the control system 3 opens the electromagnetic proportional valve 9 between the desulfurization solution tank 1 and the exhaust gas desulfurization tank 2, opens the opening degree of the electromagnetic proportional valve 9, and under the action of the boost motor 4, the circulated treated exhaust gas is slowly transmitted to the exhaust gas desulfurization tank 2, and the sulfur dioxide in the exhaust gas is further removed through the desulfurization reactants on the frame 10 inside the exhaust gas desulfurization tank 2. When the pressure value in the exhaust gas desulfurization box 2 exceeds the pressure range value set by the control system 3, and the sulfur dioxide concentration value in the exhaust gas desulfurization box 2 has not reached the sulfur dioxide concentration range value set by the control system 3, the control system 3 opens the solenoid valve 5 in the loop, closes the solenoid proportional valve 9 between the desulfurization solution tank 1 and the exhaust gas desulfurization box 2, and runs the booster in the exhaust gas desulfurization box 2 loop, so that the exhaust gas forms a loop between the box body, the booster motor 4 and the pipeline, and circulates with the reactants on the frame 10 until the sulfur dioxide concentration reaches the range value set by the control system 3, then opens the solenoid valve 5 at the exhaust end to discharge the exhaust gas to achieve the purpose of desulfurization.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit the present invention. A person skilled in the art should understand that the specific implementation of the present invention can be modified or replaced by equivalents, but these modifications or changes are within the scope of protection of the pending claims.

Claims

1. A gas desulfurization treatment system for thermal power generation, characterized in that: It includes a desulfurization solution tank, a tail gas desulfurization tank and a control system; The desulfurization solution tank comprises a tank body, an air inlet end, an exhaust end and a solution input end, the air inlet end and the exhaust end are mounted on the upper end of the tank body, the solution input end is mounted on the lower end of the tank body, the air inlet end is connected to the exhaust gas and the interior of the tank body through a pipeline, a boost motor and a solenoid valve are mounted on the pipeline, the tank body is connected to the pipeline between the solenoid valve and the boost motor through a pipeline, a solenoid valve is mounted on the pipeline, so that a loop is formed between the tank body, the boost motor and the air inlet end, the solution is input through the pipeline, a solenoid valve is mounted on the pipeline, the exhaust end is connected to the exhaust gas desulfurization tank through a pipeline, a solenoid proportional valve is mounted on the pipeline, a pressure sensor and a sulfur dioxide concentration detection sensor are mounted on the tank body, and a solution of sulfur dioxide scavenger is injected into the bottom of the tank body through the solution input end; The tail gas desulfurization box includes a box body, an air inlet end, an exhaust end and a frame body, the air inlet end is installed at the upper end of the box body, the exhaust end is installed at the lower end of the box body, the frame body is installed inside the box body, the air inlet end is connected to the exhaust end of the desulfurization solution box through a pipeline, the frame body is installed inside the box body, sulfur dioxide solid reactant is placed in the frame body, the exhaust end is connected to the outside air through a pipeline, a booster motor and a solenoid valve are installed on the pipeline, the upper end of the box body is connected to the exhaust end pipeline through a pipeline, a solenoid valve is installed on the pipeline, so that a loop is formed between the box body, the booster motor and the pipeline, and a pressure sensor and a sulfur dioxide concentration detection sensor are installed on the box body; The control system comprises a signal detection module, a digital quantity control module and an analog quantity output module. The signal detection module is connected to the pressure sensor and the sulfur dioxide concentration detection sensor in the desulfurization solution tank and the tail gas desulfurization tank. The pressure value and the sulfur solubility value in the desulfurization solution tank and the tail gas desulfurization tank can be detected by the control system. The digital quantity control module is connected to the digital quantity control module boosting motor and the solenoid valve in the desulfurization solution tank and the tail gas desulfurization tank. The operation of the boosting motor and the solenoid valve can be automatically controlled by the control system. The analog quantity output module can be controlled to be connected to the solenoid proportional valve, and the opening degree of the solenoid proportional valve can be controlled by the control system. The solenoid valve includes a power input port, which is connected to a digital output module in the control system through a connecting line, so that the control system can automatically control the opening or closing of the solenoid valve; The electromagnetic proportional valve comprises a power input terminal and a control terminal. The power input terminal is connected to a power source to provide power for the electromagnetic proportional valve, and the control terminal is connected to an analog output module of a controller via a connecting line.

2. A gas desulfurization treatment system for thermal power generation according to claim 1, characterized in that: The boost motor comprises a power input terminal and a control terminal. The power input terminal is connected to the power supply through a connecting line, and the control terminal is connected to a digital quantity output module of the control system through a connecting line.

3. A gas desulfurization treatment system for thermal power generation according to claim 1, characterized in that: The pressure sensor comprises a signal transmission port, and the signal transmission port is connected to a signal detection module in the control system through a connecting line.

4. A gas desulfurization treatment system for thermal power generation according to claim 1, characterized in that: The sulfur dioxide concentration detection sensor comprises a signal transmission port, and the signal transmission port is connected to a signal detection module in a control system through a connecting line.

Images