Adjustable flue gas white-eliminating energy-saving device and control method

Abstract

The invention discloses an adjustable flue gas white smoke eliminating and energy saving device and a control method, the device comprises an adjustable smoke cooler, an adjustable heat exchanger, a hygrothermograph assembly and a control system, and the adjustable smoke cooler and the adjustable heat exchanger are respectively used for cooling heat exchange and heating heat exchange of flue gas; and the control system adjusts and controls the flue gas white smoke eliminating device according to a set value of the hygrothermograph assembly. The adjustable smoke cooler comprises a condensation pipe, a condensate water inlet, a condensate water outlet, a first cross flow separation plate, a first cuboid plate wall and a first electric control valve plate door; the adjustable heat exchanger comprises a heat exchange pipe, a hot water vapor inlet, a hot water vapor outlet, a second cuboid plate wall, a second cross flow separation plate and a second electric control valve plate door. The white elimination control method comprises a general control mode and an optimal control mode. The white elimination control method can be used in spring, summer, autumn and winter, and is wide in south and north applicability, good in adjustability, high in automation degree and wide in adjustable range.

Description

Technical Field

[0001] The invention belongs to the field of flue gas treatment and emission equipment, and in particular relates to an adjustable flue gas whitening and energy-saving device and a control method. Background Art

[0002] Wet flue gas desulfurization is one of the important means to control flue gas emissions from coal-fired power plants. Generally speaking, the temperature of saturated flue gas treated by wet flue gas desulfurization equipment is between 45 and 55 °C, and the flue gas contains a large amount of water vapor. If it is discharged directly into the atmosphere, it is more likely to produce "wet smoke plumes" in autumn and winter, commonly known as "white smoke". Most scholars have studied how to eliminate white smoke, and mostly use heating methods or cooling and heating methods. However, due to the high ambient temperature in summer and the low ambient temperature in winter, as well as the large difference in ambient temperature between the north and the south, wet smoke plumes are still very much distributed in coal-fired power plants. Therefore, in order to reduce the possibility of "wet smoke plumes" appearing in various seasons and in the north and south, and the inability to adjust "white smoke elimination" in ecologically sensitive areas, it is urgent to study an adjustable flue gas whitening device that can be used for flue gas whitening in a variety of situations. Summary of the invention

[0003] In view of the above-mentioned problems, the present invention provides an adjustable flue gas whitening energy-saving device and control method to solve the technical problems such as the possibility of "wet smoke plume" appearing in all seasons and in the north and south due to the large difference in ambient temperature between the north and the south, and the inability to adjust the "whitening" in ecologically sensitive areas.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: An adjustable flue gas whitening and energy-saving device comprises an adjustable smoke cooler, an adjustable heat exchanger, a thermometer and hygrometer assembly and a control system. The adjustable smoke cooler and the adjustable heat exchanger are arranged in sequence along the direction of the flue gas. The adjustable smoke cooler is used for cooling and exchanging heat with the flue gas, and the adjustable heat exchanger is used for heating and exchanging heat with the flue gas. The control system adjusts and controls the flue gas whitening and energy-saving device according to the set value of the thermometer and hygrometer assembly, so that the measurement value of the thermometer and hygrometer assembly continuously approaches the set value.

[0005] Furthermore, a first rectangular plate arm is provided inside the adjustable smoke cooler, a condenser is provided on the outside of the first rectangular plate arm, and a condenser water inlet and a condenser water outlet are provided. A first electric regulating valve plate door is provided at the front end of the first rectangular plate wall of the adjustable smoke cooler, and a first cross flow isolation plate is provided at the rear end of the adjustable smoke cooler for mixing smoke.

[0006] Furthermore, a second rectangular plate arm is arranged inside the adjustable heat exchanger, a heat exchange tube is arranged on the outside of the second rectangular plate arm, and a hot water steam inlet and a hot water steam outlet are arranged. A second electric regulating valve plate door is arranged at the front end of the second rectangular plate wall of the adjustable heat exchanger, and a second cross flow isolation plate is arranged at the rear end of the adjustable heat exchanger for mixing flue gas.

[0007] Furthermore, the thermometer and hygrometer assembly includes a desmoking device inlet thermometer arranged on the smoke inlet pipeline at the front end of the adjustable smoke cooler, a desmoking device internal thermometer arranged between the adjustable smoke cooler and the adjustable heat exchanger, a desmoking device outlet thermometer arranged on the smoke outlet pipeline at the rear end of the adjustable heat exchanger, a desmoking device outlet hygrometer and an ambient thermometer.

[0008] Furthermore, a whitening device outlet camera is provided on the flue gas outlet pipe at the rear end of the adjustable heat exchanger.

[0009] The present invention proposes a flue gas degassing control method based on the above-mentioned adjustable flue gas degassing energy-saving device, including two control modes: general control mode and optimal control mode. In the general control mode, it is necessary to manually select and set the set value according to the season; in the optimal control mode, the set value is set by an algorithm.

[0010] Furthermore, the general control mode is specifically as follows: in spring and summer, the ambient temperatures in the north and south are both high, and no cooling is needed. The first electric regulating valve door of the adjustable flue gas cooler is fully opened, and according to the deviation between the measured value and the set value of the thermometer at the outlet of the de-whitening device, the opening of the second electric regulating valve door of the adjustable heat exchanger is PID-regulated so that the measured value approaches the set value; in autumn and winter, the atmospheric ambient temperature drops; the hot flue gas is cooled first, and the first electric regulating valve door of the adjustable flue gas cooler is PID-regulated so that the internal temperature of the de-whitening device drops to 45-50°C, and then the hot flue gas is heated. According to the deviation between the measured value and the set value of the thermometer at the outlet of the de-whitening device, the opening of the second electric regulating valve door of the adjustable heat exchanger is PID-regulated so that the measured value approaches the set value, and the set value range is 75-80°C.

[0011] Furthermore, the optimal control mode is specifically as follows: establish a vector data model f(x1',x2')=[x0,x1,x2,x3,x4,g(y)] between the temperature x0 measured by the thermometer at the inlet of the desmoking device, the temperature x1 measured by the thermometer inside the desmoking device, the set temperature x1' inside the desmoking device, the temperature x2 measured by the thermometer at the outlet of the desmoking device, the set temperature x2' at the outlet of the desmoking device, the temperature x3 measured by the hygrometer at the outlet of the desmoking device, the temperature x4 measured by the ambient thermometer and the image (g(y)) acquired by the camera at the outlet of the desmoking device, and establish the optimal model relationship between the optimal set temperature x1' inside the desmoking device and the set temperature x2' at the outlet of the desmoking device in the flue gas desmoking system through the fuzzy control algorithm, and adjust the opening of the first electric regulating valve plate door and the second electric regulating valve plate door inside the desmoking device according to the relationship, so that x1 and x1' are close to each other, and x2 and x2' are close to each other. This is equivalent to obtaining the optimal relationship between the intermediate temperature, the outlet temperature and various external environmental parameters through the fuzzy control algorithm.

[0012] Compared with the prior art, the desulphurization device and control method of the present invention can be used in spring, summer, autumn and winter, and has wide applicability to the north and south. The present invention has good adjustability, high automation and wide adjustable range. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the adjustable flue gas whitening and energy-saving device of the present invention; Figure 2 for Figure 1 Middle AA section cutaway view; Figure 3 for Figure 1 Middle BB section cutaway view; Figure 4 It is a schematic diagram of the structure of the cross flow partition of the present invention; Figure 5 It is the control process diagram of the descaling device of the present invention; In the figure: 1. adjustable smoke cooler; 2. adjustable heat exchanger; 3. first rectangular plate arm; 4. condenser; 5. condenser water inlet; 6. condenser water outlet; 7. first electric regulating valve plate door; 8. first cross baffle; 9. second rectangular plate arm; 10. heat exchange tube; 11. hot water steam inlet; 12. hot water steam outlet; 13. second electric regulating valve plate door; 14. second cross baffle; 15. de-whitening device inlet thermometer; 16. de-whitening device internal thermometer; 17. de-whitening device outlet thermometer; 18. de-whitening device outlet hygrometer; 19. ambient thermometer; 20. de-whitening device outlet camera. DETAILED DESCRIPTION

[0014] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0015] like Figure 1 As shown, a schematic diagram of the adjustable flue gas whitening and energy-saving device of this embodiment is shown. It includes an adjustable smoke cooler 1, an adjustable heat exchanger 2 and a thermo-hygrometer component. The adjustable smoke cooler 1 and the adjustable heat exchanger 2 are arranged in sequence along the direction of the flue gas. The adjustable smoke cooler 1 is used to cool down the flue gas for heat exchange, and the adjustable heat exchanger 2 is used to heat up the flue gas for heat exchange. The flue gas whitening and energy-saving device is adjusted and controlled according to the parameters measured by the thermo-hygrometer component. This embodiment includes: 3 thermometers, 1 camera, 1 adjustable smoke cooler, 1 adjustable air-water heat exchanger and 1 optional control system.

[0016] like Figure 1 and Figure 2 As shown, the interior of the adjustable smoke cooler 1 is composed of a condenser 4 spiraling around, a condensate inlet 5, a condensate outlet 6, a first cross flow partition 8, a first rectangular plate wall 3 and a first electric regulating valve plate door 7. The structure of the adjustable smoke cooler 1 is that the first electric regulating valve plate door 7 is installed inside the flue gas pipeline. When the first electric regulating valve plate door 7 is fully opened, according to the direction of the flue gas, the flue gas and the condenser 4 do not exchange heat; when the first electric regulating valve plate door 7 is opened at 0-100%, the flue gas and the condenser 4 start to exchange heat, and the flue gas cools down. The rear side of the adjustable smoke cooler 1 is an adjustable heat exchanger 2.

[0017] like Figure 1 and Figure 3 As shown, the interior of the adjustable heat exchanger 3 is composed of a heat exchange tube 10 spiraling around, a hot water steam inlet 11, a hot water steam outlet 12, a second rectangular parallelepiped plate wall 9, a second cross flow partition 14 and a second electric regulating valve plate door 13. The structure of the adjustable heat exchanger 2 is that the second electric regulating valve plate door 13 is installed inside the flue gas pipeline. When the second electric regulating valve plate door 13 is fully opened, according to the direction of the flue gas, the flue gas and the hot water pipe 10 do not exchange heat; when the second electric regulating valve plate door 13 is opened at 0-100%, the flue gas and the hot water pipe 10 start to exchange heat, and the flue gas temperature rises.

[0018] A selectable control system consists of two control modes, one is the general control mode and the other is the optimal control mode. In the general control mode, the operator needs to manually set the set value according to the season; in the optimal control mode, the set value is set by the algorithm. Figure 5 shown.

[0019] In the general control mode, the flue gas temperature at the flue gas outlet of wet flue gas desulfurization is about 50℃, which is equivalent to the design value of TT01 of 50℃. In the general control mode, when autumn and winter come, TT02 is set to 45℃, and the opening of the first electric regulating valve plate door 7 of the smoke cooler 1 can be adjusted to form PID regulation with TT02, and TT03 is set to 75℃, and the opening of the second electric regulating valve plate door 13 of the heat exchanger 2 can be adjusted to form PID regulation with TT03; when the winter ambient temperature is below 10℃, the TT03 setting value is modified to 80℃, and the opening of the second electric regulating valve plate door 13 of the heat exchanger 2 can be adjusted to form PID regulation with TT03. In spring and summer, the first electric regulating valve plate door 7 of the smoke cooler 1 can be adjusted to open 100%, which is equivalent to the smoke cooler being a through pipe.

[0020] Under the optimal control mode, the flue gas temperature at the flue gas outlet and chimney inlet of wet flue gas desulfurization is about 50°C, which is equivalent to the TT01 design value of 50°C. A data model is established between the inlet temperature TT01 of the desulfurization device, the internal temperature TT02 of the desulfurization device, the outlet temperature TT03 of the desulfurization device, the humidity MT01 at the outlet of the desulfurization device, the ambient temperature TT00 and the outlet image AA01 of the desulfurization device. Through the fuzzy control algorithm, the optimal model relationship between the optimal internal temperature of the desulfurization device and the outlet temperature of the desulfurization device in the flue gas desulfurization system is established, and the opening of the first electric regulating valve plate door of the adjustable smoke cooler and the second electric regulating valve plate door of the adjustable heat exchanger are adjusted according to the relationship.

[0021] In addition, two cross-flow partitions are arranged at the smoke outlet of the adjustable smoke cooler 1 and the smoke outlet of the adjustable heat exchanger 2. The first cross-flow partition 8 and the second cross-flow partition 14 are made of at least 316L and have a thickness of at least 2 mm. Figure 4 The form is a rectangle with a hollow center.

[0022] The rectangular parallelepiped wall material of the adjustable smoke cooler 1 and the adjustable heat exchanger 2 of the present invention is at least 316L and at least 2mm thick. The heat exchange area of ​​the adjustable smoke cooler 1 of the present invention is calculated at least according to a temperature difference of 15°C, and the heat exchange area of ​​the adjustable heat exchanger 2 of the present invention is calculated at least according to a temperature difference of 40°C.

[0023] The present invention uses two control modes, a general control mode and an optimal control mode, and on-site operators can adjust the control mode according to actual conditions on site.

[0024] Compared with the prior art, the present invention can be used in spring, summer, autumn and winter, and has wide applicability to the north and south. The present invention has good adjustability, high automation and wide adjustable range.

[0025] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An adjustable flue gas whitening and energy-saving device, characterized in that: The invention comprises an adjustable smoke cooler (1), an adjustable heat exchanger (2), a thermo-hygrometer component and a control system, wherein the adjustable smoke cooler (1) and the adjustable heat exchanger (2) are arranged in sequence along the direction of the smoke flow, the adjustable smoke cooler (1) is used to cool the smoke and exchange heat, and the adjustable heat exchanger (2) is used to heat the smoke and exchange heat, and the control system adjusts and controls the smoke whitening and energy-saving device according to the set value of the thermo-hygrometer component.

2. The adjustable flue gas whitening and energy-saving device according to claim 1 is characterized in that: The adjustable smoke cooler (1) is provided with a first rectangular plate arm (3) inside, a condenser (4) is provided on the outside of the first rectangular plate arm (3), and a condenser water inlet (5) and a condenser water outlet (6) are provided, a first electric regulating valve plate door (7) is provided at the front end of the first rectangular plate wall (3) of the adjustable smoke cooler (1), and a first cross flow partition (8) is provided at the rear end inside the adjustable smoke cooler (1).

3. The adjustable flue gas whitening and energy-saving device according to claim 1 is characterized in that: The adjustable heat exchanger (2) is provided with a second rectangular plate arm (9) inside, a heat exchange tube (10) is provided outside the second rectangular plate arm (9), and a hot water steam inlet (11) and a hot water steam outlet (12) are provided, a second electric regulating valve plate door (13) is provided at the front end of the second rectangular plate arm (9) of the adjustable heat exchanger (2), and a second cross flow partition (14) is provided at the rear end inside the adjustable heat exchanger (2).

4. The adjustable flue gas whitening and energy-saving device according to claim 1 is characterized in that: The thermometer and hygrometer assembly comprises a desmoking device inlet thermometer (15) arranged on the smoke inlet pipeline at the front end of the adjustable smoke cooler (1), a desmoking device internal thermometer (16) arranged between the adjustable smoke cooler (1) and the adjustable heat exchanger (2), a desmoking device outlet thermometer (17) arranged on the smoke outlet pipeline at the rear end of the adjustable heat exchanger (2), a desmoking device outlet hygrometer (18) and an ambient thermometer (19).

5. The adjustable flue gas whitening and energy-saving device according to claim 1 is characterized in that: A smoke elimination device outlet camera (20) is also provided on the smoke outlet pipeline at the rear end of the adjustable heat exchanger (2).

6. A flue gas degassing control method for an adjustable flue gas degassing energy-saving device as claimed in any one of claims 1 to 5, characterized in that: There are two control modes: general control mode and optimal control mode. In the general control mode, the set value needs to be set manually according to the season; in the optimal control mode, the set value is set by an algorithm.

7. A flue gas degassing control method for an adjustable flue gas degassing energy-saving device according to claim 6, characterized in that: The general control mode is specifically as follows: in spring and summer, the ambient temperatures in the north and south are both relatively high and no cooling is required. The first electric regulating valve plate door (7) of the adjustable flue gas cooler (1) is fully opened. According to the deviation between the measured value of the outlet thermometer (17) of the de-whitening device and the set value, the PID is used to adjust the opening of the second electric regulating valve plate door (13) of the adjustable heat exchanger (2) so that the measured value approaches the set value. In autumn and winter, the ambient temperature of the atmosphere decreases. The hot flue gas is first cooled by using the PID to adjust the first electric regulating valve plate door (7) of the adjustable flue gas cooler (1) so that the internal temperature of the de-whitening device drops to 45-50°C. Then, the hot flue gas is heated. According to the deviation between the measured value of the outlet thermometer (17) of the de-whitening device and the set value, the PID is used to adjust the opening of the second electric regulating valve plate door (13) of the adjustable heat exchanger (2) so that the measured value approaches the set value. The set value interval range is 75-80°C.

8. The method for controlling flue gas whitening of an adjustable flue gas whitening and energy-saving device according to claim 6, characterized in that: The optimal control mode is specifically as follows: a data model is established between the temperature measured by the inlet thermometer (15) of the descaling device, the temperature measured by the internal thermometer (16) of the descaling device, the internal set temperature of the descaling device, the outlet set temperature of the descaling device, the temperature measured by the outlet thermometer (17) of the descaling device, the humidity measured by the outlet hygrometer (18) of the descaling device, the temperature measured by the ambient thermometer (19) and the image obtained by the outlet camera (20) of the descaling device, and the optimal model relationship between the internal set temperature of the descaling device and the outlet set temperature of the descaling device in the flue gas descaling system under the environmental conditions is obtained through a fuzzy control algorithm, and the openings of the first electric regulating valve plate door (7) and the second electric regulating valve plate door (13) inside the descaling device are adjusted respectively according to the relationship.

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