Desulfurization and denitrification device and method

Abstract

The invention belongs to the technical field of environmental protection, and particularly relates to a desulfurization and denitrification device and method.The desulfurization and denitrification device comprises a desulfurization mechanism, a denitrification mechanism, a flue gas analyzer, a dust removal and emission mechanism and a PLC, and the denitrification mechanism comprises a first flue gas heater and a denitrification tower which are sequentially communicated through a pipeline; the desulfurization mechanism comprises a flue gas cooler, a dust remover and a desulfurization tower which are sequentially communicated through a pipeline, the denitration mechanism is communicated with the desulfurization mechanism through a pipeline, one of the desulfurization mechanism and the denitration mechanism is communicated with the flue gas analyzer, and the pipeline between the flue gas analyzer and the dust removal discharge mechanism is a first communicating pipe; and the pipeline between the dust remover and the desulfurizing tower is a second communicating pipe. According to the invention, desulfurization, denitration and dust removal treatment of flue gas can be synchronously realized, the spraying amount of the desulfurization tower and the ammonia gas spraying amount of the denitration tower are dynamically controlled, and equipment can be ensured to continuously operate in a most economical state and meet emission requirements.

Description

Technical Field

[0001] The present invention belongs to the technical field of environmental protection, and particularly relates to a desulfurization and denitrification device and method. Background Art

[0002] With the acceleration of industrialization and urbanization, the flue gas discharged from coal-fired power plants, steel plants, chemical plants, etc. contains a large amount of sulfur dioxide (SO2) and nitrogen oxides (NO x ), and these pollutants are the main causes of environmental problems such as acid rain and smog, seriously threatening the ecological environment and human health. Flue gas desulfurization and denitrification is a treatment technology for sulfur dioxide (SO2) and nitrogen oxides (NO x ) in the flue gas discharged from industries such as coal-fired power plants, iron and steel metallurgy, and chemical industries.

[0003] Currently, the widely used desulfurization technology is mainly the wet limestone-gypsum method, and its principle is to use limestone (CaCO3) slurry to react with SO2 in the flue gas to generate gypsum (CaSO4·2H2O).

[0004] Currently, the widely used denitrification technologies mainly include selective catalytic reduction SCR method and selective non-catalytic reduction SNCR method. The SCR method is to inject a reducing agent into the flue gas under the action of a catalyst to reduce NO x to N2 and H2O. The SNCR method is to inject urea or NH3 under the condition of high temperature without a catalyst to reduce NO x to N2.

[0005] In current practical applications, due to abnormal operation of equipment or changes in flue gas conditions, the sulfur content or nitrate content in the treated flue gas often exceeds the emission standard, and due to the lack of effective control technology, pollutants are discharged into the atmosphere. Summary of the Invention

[0006] The purpose of the present invention is to provide a desulfurization and denitrification device and method, which can synchronously solve the desulfurization, denitrification and dust removal treatment of flue gas, dynamically control the spray volume of the desulfurization tower and the ammonia injection volume of the denitrification tower, and ensure that the equipment can continuously operate in a most economical state and meet the emission requirements.

[0007] The technical solution adopted by the present invention is specifically as follows:

[0008] A desulfurization and denitrification method, comprising the following steps:

[0009] S1, heating the flue gas through a first flue gas heater, and then performing denitrification treatment through a denitrification tower;

[0010] S2, cooling the denitrified flue gas through a flue gas cooler, and after the cooling is completed, performing dust removal treatment on the flue gas through a dust collector;

[0011] S3. Deliver the flue gas into the interior of the desulfurization tower for desulfurization treatment;

[0012] S4. The desulfurized flue gas enters the flue gas analyzer, and the SO2 content in the flue gas is detected and recorded in real time as the y value, and the NO content in the flue gas is detected and recorded in real time as the x value. The SO2 content value meeting the emission standard is recorded as the y0 value, and the NO content value meeting the emission standard is recorded as the x0 value; x content is the x value. The SO2 content value meeting the emission standard is recorded as the y0 value, and the NO x content value is recorded as the x0 value;

[0013] S5. If both the sulfur content and the nitrate content of the flue gas meet the emission standard values, set the first electric valve to open, the second and third electric valves to close, stop the induced draft fan, the flue gas flows out from the first electric valve, undergoes dust removal treatment by the dust collector, and then is heated by the second flue gas heater and discharged through the chimney;

[0014] If any one of the sulfur content and the nitrate content in the flue gas does not meet the emission standard value, perform the desulfurization and denitration emission over-standard treatment process.

[0015] A desulfurization and denitration method includes the following steps:

[0016] Step 1. The high-temperature flue gas is cooled by the flue gas cooler and then undergoes dust removal treatment by the dust collector;

[0017] Step 2. Perform flue gas desulfurization treatment by the desulfurization tower;

[0018] Step 3. Heat the desulfurized flue gas by the first flue gas heater and then enter the denitration tower for denitration treatment;

[0019] Step 4. The denitrated flue gas enters the flue gas analyzer, and the SO2 content in the flue gas is detected and recorded in real time as the y value, and the NO x content is detected and recorded in real time as the x value. The SO2 content value meeting the emission standard is recorded as the y0 value, and the NO x content value is recorded as the x0 value;

[0020] Step 5. If both the sulfur content and the nitrate content of the flue gas meet the emission standard values, set the first electric valve to open, the second and third electric valves to close, stop the induced draft fan, the flue gas flows out from the first electric valve, undergoes dust removal treatment by the dust collector, and then is heated by the second flue gas heater and discharged through the chimney;

[0021] If any one of the sulfur content and the nitrate content in the flue gas does not meet the emission standard value, perform the desulfurization and denitration emission over-standard treatment process.

[0022] Further, the emission over-standard treatment process includes Emission Over-Standard Treatment Process One, Emission Over-Standard Treatment Process Two, and Emission Over-Standard Treatment Process Three;

[0023] If the SO2 content exceeds the standard and the NO x content meets the standard, use the first emission over-standard treatment process. The first emission over-standard treatment process includes the following steps:

[0024] A1. Close the first electric valve and the second electric valve, and turn on the induced draft fan and the third electric valve; at this time, the flue gas that does not meet the emission standard flows back through the induced draft fan and enters the inlet of the desulfurization tower through the third electric valve;

[0025] A2. Calculate the coefficient by which SO2 exceeds the standard. The formula is (y - y0) / y0. The currently measured SO2 content is the y value, and the SO2 content value that meets the emission standard is the y0 value. Under the same flue gas, the outlet SO2 content values at different levels are recorded as n i and the spray control strategy and n are stored in the PLC controller i The predefined SO2 content value at the current spray level is n1. Calculate the comparison coefficient values at different levels above (n1 - n i ) / n1, and find the comparison coefficient value closest to (y - y0) / y0;

[0026] A3. Control the spray system of the desulfurization tower through the PLC controller, map the comparison coefficient value in step A2 to the corresponding control strategy, and adjust the spray system to the corresponding spray level;

[0027] A4. Detect whether the sulfur content after desulfurization treatment is qualified, that is, whether y ≤ y0 is satisfied;

[0028] A5. If y ≤ y0 is satisfied, open the first electric valve, close the induced draft fan, the second electric valve, and the third electric valve. The flue gas flows out through the first electric valve, undergoes dust removal treatment, and then is discharged through the chimney after heating;

[0029] If y > y0, raise the spray level of the desulfurization tower spray system by one level, and then repeat step A4;

[0030] If the SO2 content meets the standard (y ≤ y0) and the NO x content exceeds the standard, use the second emission over-standard treatment process. The second emission over-standard treatment process includes the following steps:

[0031] B1. Close the first electric valve and the third electric valve, and turn on the induced draft fan and the second electric valve; at this time, the flue gas that does not meet the emission standard flows back through the induced draft fan and enters the first flue gas heater through the second electric valve;

[0032] B2. Calculate the coefficient by which NO x exceeds the standard. The formula is (x - x0) / x0; the currently measured NO x content is the x value, and the NO xThe content value is the x0 value. Under the same flue gas, the outlet NO of different levels is recorded. x The content value is m. i In the PLC controller, an ammonia injection control strategy and m are stored. i For the predefined NO of the current ammonia injection level x The content value is m1. Calculate the comparison coefficient value (m1 - m) at different levels above, i ) / m1, and find the comparison coefficient value closest to (x - x0) / x0.

[0033] B3. Control the first flue gas heater spraying system through the PLC controller. Map the comparison coefficient value in step B2 to the corresponding control strategy, and adjust the first flue gas heater spraying system to the corresponding ammonia injection level.

[0034] B4. Detect whether the nitrate content after denitrification treatment is qualified, whether it satisfies x ≤ x0

[0035] B5. If x ≤ x0 is satisfied, open the first electric valve, close the induced draft fan and the second and third electric valves. The flue gas flows out from the first electric valve, undergoes dust removal treatment, and then is discharged through the chimney after heating.

[0036] If x > x0, increase the spraying level of the first flue gas heater spraying system by one level, and then repeat step B4.

[0037] If the SO2 content exceeds the standard (y > y0) and the NO x content exceeds the standard (x > x0), use the emission over - standard treatment process three, and the emission over - standard treatment process three includes the following steps:

[0038] Open the induced draft fan and the second and third electric valves, close the first electric valve, and simultaneously execute the emission over - standard treatment process one and the emission over - standard treatment process two.

[0039] Further, when the NO x content meets the standard x ≤ x0, and in the case of a decrease in the flue gas inlet concentration and flow rate, the first flue gas heater spraying system performs dynamic level adjustment.

[0040] The dynamic level adjustment of the first flue gas heater spraying system includes the following steps:

[0041] Step 1: Calculate the NO x surplus coefficient, and the formula is (x0 - x) / x. Pre - define a safety coefficient value m0. When the NO x surplus coefficient value falls within the safety coefficient interval, it means that the current level of the first flue gas heater spraying system is already in the optimal state. At this time, the first flue gas heater operates at this ammonia injection level.

[0042] Step 2: When the NOx If the surplus coefficient value exceeds the safety coefficient, the ammonia spraying level of the spray system will be lowered by one level, and then the outlet NO will be detected x content and repeat step 1;

[0043] When the SO2 content meets the standard y ≤ y0, and under the condition of reduced flue gas inlet concentration and flow rate, the spray system of the desulfurization tower is adjusted dynamically;

[0044] The dynamic level adjustment of the spray system of the desulfurization tower includes the following steps:

[0045] Step 1: Calculate the SO2 surplus coefficient, the formula is (y0 - y) / y, and a predefined safety coefficient value n0 is set. When the SO2 surplus coefficient value falls within the safety coefficient range, it means that the current spray system level of the desulfurization tower is already in the optimal state, and at this time, the desulfurization tower operates at this spray level;

[0046] Step 2: When the SO2 surplus coefficient value exceeds the safety coefficient, lower the spray level of the spray system by one level, and then detect the outlet SO2 content and repeat the previous step.

[0047] A desulfurization and denitrification device includes a desulfurization mechanism, a denitrification mechanism, a flue gas analyzer, a dust removal and emission mechanism, and a PLC controller;

[0048] The denitrification mechanism includes a first flue gas heater and a denitrification tower connected in sequence through a pipeline;

[0049] The desulfurization mechanism includes a flue gas cooler, a dust collector, and a desulfurization tower connected in sequence through a pipeline;

[0050] The denitrification mechanism and the desulfurization mechanism are connected through a pipeline;

[0051] One of the desulfurization mechanism and the denitrification mechanism is connected to the flue gas analyzer;

[0052] The pipeline between the flue gas analyzer and the dust removal and emission mechanism is the first connecting pipe, the pipeline between the dust collector and the desulfurization tower is the second connecting pipe, the input end of the first flue gas heater is fixedly connected with a feed pipe, and a first electric valve is installed on the first connecting pipe;

[0053] The position of the first connecting pipe in front of the first electric valve is connected to an induced draft fan through a pipeline, the induced draft fan is connected to the feed pipe through a third connecting pipe, and a second electric valve is fixedly connected to the third connecting pipe;

[0054] The induced draft fan is connected to the second connecting pipe through a fourth connecting pipe, and a third electric valve is fixedly connected to the second connecting pipe;

[0055] Spray systems are provided inside both the denitrification tower and the desulfurization tower;

[0056] The denitration tower, desulfurization tower, flue gas analyzer, induced draft fan, first electric valve, second electric valve, and third electric valve are all electrically connected to the PLC controller. The flue gas analyzer is used to detect the SO2 content and NO content in the desulfurized flue gas. x content.

[0057] Further, the dust removal and emission mechanism includes a dust collector, a second flue gas heater, and a chimney that are sequentially connected through a pipeline. The first connecting pipe is connected to the dust collector.

[0058] Further, the spraying system includes an inner cavity adjusting mechanism and a dynamic spraying mechanism;

[0059] Both the denitration tower and the desulfurization tower include a tower body. The inner cavity adjusting mechanism includes six blocks installed inside the tower body. The six blocks are arranged in a circular array. The space between the multiple blocks is the flue gas flow inner cavity. The side of the block close to the flue gas flow inner cavity is the contact surface. The side of the block located adjacent to the contact surface in the clockwise direction is the sliding inclined surface. The contact surfaces and sliding inclined surfaces of adjacent two blocks are slidably connected. The block can slide along the direction of its sliding inclined surface;

[0060] Two annular sealing plates are fixedly connected inside the tower body. The two annular sealing plates are respectively located above and below the blocks. Six guiding grooves are opened on the annular sealing plates. Round rods are fixedly connected to the upper and lower ends of the block. The round rods are slidably connected inside the guiding grooves;

[0061] An electric push rod is fixedly connected to the inner wall of the tower body. The piston rod of the electric push rod is fixedly connected to the block;

[0062] The dynamic spraying mechanism includes a positioning bracket fixedly connected inside the tower body. A turntable located at the axis of the flue gas flow inner cavity is rotatably connected to the positioning bracket. Six second elastic telescopic rods are rotatably connected to the circumferential side of the turntable. The end of the second elastic telescopic rod away from the turntable is fixedly connected to an arc-shaped pipe. Adjacent two arc-shaped pipes are connected through a second hose. A spraying head is fixedly connected to the lower side of the arc-shaped pipe. A feed pipe is fixedly connected to the tower body. The feed pipe is connected to one of the arc-shaped pipes through a first hose;

[0063] The arc-shaped pipe is connected to the position on the contact surface close to the sliding inclined surface through a first elastic telescopic rod. Both the arc-shaped pipe and the contact surface are rotatably connected to the first elastic telescopic rod.

[0064] The technical effects achieved by the present invention are:

[0065] A desulfurization and denitrification device and method of the present invention simultaneously solve the desulfurization, denitrification and dust removal of flue gas. Secondly, by adding end-of-pipe flue gas detection and a PLC controller, it can control and further process the flue gas that does not meet the emission standards when conditions change, ensuring that the pollutants finally emitted into the atmosphere are within the national emission standards. Finally, through the end-of-pipe flue gas detection value, the spraying amount of the desulfurization tower and the ammonia injection amount of the denitrification tower are dynamically controlled to ensure that the equipment can operate continuously in a most economical state and meet the emission requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 is a schematic structural diagram of the present invention;

[0067] Figure 2 is a process flow chart in the second embodiment of the present invention;

[0068] Figure 3 is a process flow chart in the third embodiment of the present invention;

[0069] Figure 4 is a process flow chart of the first emission over-standard treatment process in the fourth embodiment of the present invention;

[0070] Figure 5 is a process flow chart of the second emission over-standard treatment process in the fourth embodiment of the present invention;

[0071] Figure 6 is in the fourth embodiment of the present invention when the NO x content meets the standard (x ≤ x0) and the flue gas inlet concentration and flow rate decrease;

[0072] Figure 7 is in the fourth embodiment of the present invention when the SO2 content meets the standard (y ≤ y0) and the flue gas inlet concentration and flow rate decrease;

[0073] Figure 8 is a schematic structural diagram of the denitrification tower or the desulfurization tower in the fifth embodiment of the present invention;

[0074] Figure 9 is a sectional structural diagram of the denitrification tower or the desulfurization tower in the fifth embodiment of the present invention;

[0075] Figure 10 is an operation flow chart of the stopper in the fifth embodiment of the present invention;

[0076] Figure 11 is a partial structural diagram of the denitrification tower or the desulfurization tower in the fifth embodiment of the present invention;

[0077] Figure 12 is a schematic structural diagram of the dynamic spraying mechanism in the fifth embodiment of the present invention;

[0078] Figure 13It is a schematic cross-sectional view of the elastic telescopic rod in the fifth embodiment of the present invention.

[0079] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0080] 1. First flue gas heater; 2. Denitration tower; 3. Flue gas cooler; 4. Dust collector; 5. Desulfurization tower; 6. Flue gas analyzer; 7. Dust collector; 8. Second flue gas heater; 9. Chimney; 10. Induced draft fan; 11. First electric valve; 12. Second electric valve; 13. Third electric valve; 14. PLC controller; 15. Tower body; 16. Feed pipe; 17. Positioning bracket; 18. Ring-shaped sealing plate; 19. Stopper; 20. Electric push rod; 21. Guide groove; 22. Round rod; 23. Contact surface; 24. Sliding inclined surface; 25. First hose; 26. Turntable; 27. Arc-shaped pipe; 28. Spray head; 29. Second hose; 30. First elastic telescopic rod; 31. Second elastic telescopic rod; 32. Sleeve; 33. Slide bar; 34. Return spring. Detailed implementation mode

[0081] In order to make the purpose and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementation modes of the present invention, and does not strictly limit the scope of protection specifically claimed by the present invention.

[0082] Embodiment 1:

[0083] As Figure 1-2 shown, a desulfurization and denitration device includes a desulfurization mechanism, a denitration mechanism, a flue gas analyzer 6, a dust removal and emission mechanism, and a PLC controller 14;

[0084] The denitration mechanism includes a first flue gas heater 1 and a denitration tower 2 connected in sequence through a pipeline. The desulfurization mechanism includes a flue gas cooler 3, a dust collector 4, and a desulfurization tower 5 connected in sequence through a pipeline. The denitration mechanism and the desulfurization mechanism are connected through a pipeline. It can be that the denitration tower 2 and the flue gas cooler 3 are connected through a pipeline, or the desulfurization tower 5 and the first flue gas heater 1 are connected through a pipeline. One of the desulfurization mechanism and the denitration mechanism located at the rear is connected to the flue gas analyzer 6, and the flue gas is transported into the flue gas analyzer 6, and the flue gas analyzer 6 is connected to the dust removal and emission mechanism.

[0085] Among them, the first flue gas heater 1 and the dust collector 4 can be realized by using a set of flue gas heat exchangers;

[0086] Among them, the dust collector 4 can be an electrostatic precipitator, a bag filter or other types of dust collectors;

[0087] Among them, the PLC controller 14 can also be a microcomputer or a computer control system.

[0088] Among them, the pipeline between the flue gas analyzer 6 and the dust removal and emission mechanism is the first connecting pipe, and the pipeline between the dust collector 4 and the desulfurization tower 5 is the second connecting pipe. The input end of the first flue gas heater 1 is fixedly connected with a feed pipe. A first electric valve 11 is installed on the first connecting pipe to control whether the connection between the flue gas analyzer 6 and the dust removal and emission mechanism is established. If it is connected, the gas discharged from the flue gas analyzer 6 can directly enter the interior of the dust removal and emission mechanism;

[0089] And the position of the first connecting pipe in front of the first electric valve 11 is connected to a draft fan 10 through a pipeline. The draft fan 10 is connected to the feed pipe through a third connecting pipe. A second electric valve 12 is fixedly connected to the third connecting pipe to control whether the connection between the draft fan 10 and the first flue gas heater 1 is established. When the draft fan 10 and the first flue gas heater 1 are connected, the gas discharged from the flue gas analyzer 6 can directly enter the first flue gas heater 1 through the draft fan 10 and the third connecting pipe, and enter the denitration tower 2 through the first flue gas heater 1 for denitration treatment;

[0090] The draft fan 10 is connected to the second connecting pipe through a fourth connecting pipe. A third electric valve 13 is fixedly connected to the second connecting pipe to control whether the connection between the draft fan 10 and the desulfurization tower 5 is established. When the draft fan 10 and the desulfurization tower 5 are connected, the gas discharged from the flue gas analyzer 6 can be directly transported into the desulfurization tower 5 through the draft fan 10 and the fourth connecting pipe for desulfurization treatment;

[0091] The denitration tower 2, the desulfurization tower 5, the flue gas analyzer 6, the draft fan 10, the first electric valve 11, the second electric valve 12, and the third electric valve 13 are all electrically connected to the PLC controller 14. The flue gas analyzer 6 is used to detect the SO2 content and NO x content in the flue gas for desulfurization;

[0092] If both the sulfur content and the nitrate content meet the emission standards, the first electric valve 11 is opened and the draft fan 10, the second electric valve 12, and the third electric valve 13 are closed through the PLC controller 14, so that the flue gas for desulfurization is directly transported into the dust removal and emission mechanism for dust removal and emission;

[0093] If the sulfur content does not meet the emission standards while the nitrate content meets the emission standards, the first electric valve 11 and the second electric valve 12 are closed, and the draft fan 10 and the third electric valve 13 are opened, so that the flue gas for desulfurization is directly transported into the desulfurization tower 5 for re-desulfurization treatment;

[0094] If both the sulfur content and the nitrate content do not meet the emission standards, the first electric valve 11 and the third electric valve 13 are closed through the PLC controller 14, and the draft fan 10 and the second electric valve 12 are opened, so that the flue gas for desulfurization is directly transported into the first flue gas heater 1 for re-desulfurization and denitration treatment.

[0095] Meanwhile, a spray system is provided inside both the denitration tower 2 and the desulfurization tower 5. The PLC controller 14 can control the spray level of the spray system, so that the amount of sprayed material of the dynamic spray system is adapted to the flow rate of the desulfurized flue gas.

[0096] Specifically, as Figure 1 shown, the dust removal and emission mechanism includes a dust collector 7, a second flue gas heater 8 and a chimney 9 that are sequentially connected through pipelines. The first connecting pipe is connected to the dust collector 7. The flue gas meeting the emission standard enters the dust collector 7 for dust removal treatment, and is discharged through the chimney 9 after being heated by the second flue gas heater 8.

[0097] In summary, this technical solution synchronously solves the desulfurization, denitration and dust removal treatment of flue gas. Secondly, by adding end-of-pipe flue gas detection and the PLC controller 14, it can control and further process the flue gas that does not meet the emission standard when conditions change, ensuring that the pollutants finally discharged into the atmosphere are within the national emission standard range. Finally, through the end-of-pipe flue gas detection value, the spray volume of the desulfurization tower 5 and the ammonia injection volume of the denitration tower 2 are dynamically controlled to ensure that the equipment can continuously operate in a most economical state and meet the emission requirements.

[0098] Embodiment 2:

[0099] As Figure 1-Figure 2 shown, on the basis of Embodiment 1, this technical solution discloses a desulfurization and denitration method, which specifically includes the following steps:

[0100] S1, heating the flue gas to the corresponding temperature range through the first flue gas heater 1, and then performing denitration treatment through the denitration tower 2; for SCR denitration, the commonly used temperature range is 300–400 °C; for SNCR denitration, the commonly used temperature range is 850–1100 °C;

[0101] S2, cooling the denitrated flue gas through the flue gas cooler 3, and performing dust removal treatment on the flue gas through the dust collector 4 after the cooling is completed;

[0102] S3, conveying the flue gas into the desulfurization tower 5 for desulfurization treatment;

[0103] S4, the flue gas after desulfurization treatment enters the flue gas analyzer 6, and the SO2 content in the flue gas is detected and recorded as the y value in real time, and the NO x content is detected and recorded as the x value in real time. The SO2 content value meeting the emission standard is recorded as the y0 value, and the NO x content value meeting the emission standard is recorded as the x0 value;

[0104] S5. If both the sulfur content and the nitrate content in the flue gas meet the emission standard values, set the first electric valve 11 to open, the second electric valve 12 and the third electric valve 13 to close, stop the induced draft fan 10. The flue gas flows out from the first electric valve 11, is dust-removed by the dust collector 7, then heated by the second flue gas heater 8, and discharged through the chimney 9.

[0105] The first flue gas heater 1, the dust collector 4 and the second flue gas heater 8 here can be satisfied by the same GGH heat exchanger.

[0106] If either the sulfur content or the nitrate content in the flue gas does not meet the emission standard value, perform the desulfurization and denitrification emission over-standard treatment process, that is, repeat steps S3 - S5 when the sulfur content does not meet the emission standard value, and repeat steps S1 - S5 when the nitrate content does not meet the emission standard value.

[0107] Embodiment 3:

[0108] As Figure 3 shown, on the basis of Embodiment 2, this embodiment discloses another desulfurization and denitrification method. The difference between this embodiment and Embodiment 2 is that the first flue gas heater 1 and the denitrification tower 2 are arranged behind the flue gas cooler 3, the dust collector 4 and the desulfurization tower 5, that is, desulfurization treatment is carried out first, and then denitrification treatment. The specific steps are as follows:

[0109] Step 1. The high-temperature flue gas is cooled by the flue gas cooler 3, and then dust-removed by the dust collector 4. The common temperature of the flue gas at the inlet of the desulfurization tower 5 is 120–160°C.

[0110] Step 2. Carry out flue gas desulfurization treatment through the desulfurization tower 5;

[0111] Step 3. Heat the desulfurized flue gas to the corresponding temperature range by the first flue gas heater 1, and enter the denitrification tower 2 for denitrification treatment;

[0112] Step 4. The flue gas after denitrification treatment enters the flue gas analyzer 6, and the SO2 content in the flue gas is detected and recorded as the y value in real time, and the NO x content is detected and recorded as the x value in real time. The SO2 content value meeting the emission standard is recorded as the y0 value, and the NO x content value meeting the emission standard is recorded as the x0 value;

[0113] Step 5. If both the sulfur content and the nitrate content in the flue gas meet the emission standard values, set the first electric valve 11 to open, the second electric valve 12 and the third electric valve 13 to close, stop the induced draft fan 10. The flue gas flows out from the first electric valve 11, is dust-removed by the dust collector 7, then heated by the second flue gas heater 8, and discharged through the chimney 9.

[0114] The first flue gas heater 1, the dust collector 4, and the second flue gas heater 8 here can be satisfied by the same GGH heat exchanger.

[0115] If any one of the sulfur content and the nitrate content in the flue gas does not meet the emission standard value, the desulfurization and denitrification emission over-standard treatment process is executed. That is, when the sulfur content does not meet the emission standard value, steps 1 - 5 are repeated; when the nitrate content does not meet the emission standard value, steps 3 - 5 are repeated.

[0116] Example 4:

[0117] This example Figure 1-Figure 7 As shown, the desulfurization and denitrification emission over-standard treatment processes in Example 2 and Example 3 are disclosed;

[0118] The emission over-standard treatment process in this example includes emission over-standard treatment process one, emission over-standard treatment process two, emission over-standard treatment process three, and emission over-standard treatment process four;

[0119] As Figure 4 shown, among them, if the SO2 content exceeds the standard (y > y0) and the NO x content meets the standard (x ≤ x0), emission over-standard treatment process one is used. Emission over-standard treatment process one includes the following steps:

[0120] A1. Close the first electric valve 11 and the second electric valve 12, and open the induced draft fan 10 and the third electric valve 13; at this time, the flue gas that does not meet the emission standard flows back through the induced draft fan 10 and enters the inlet of the desulfurization tower 5 through the third electric valve 13.

[0121] A2. Calculate the coefficient by which SO2 exceeds the standard, and the formula is (y - y0) / y0. The currently measured SO2 content is the y value, and the SO2 content value that meets the emission standard is the y0 value. The spray system of the desulfurization tower 5 has many levels, and the control strategies for different levels are different. For example, the spray volume is different, and whether the standby spray layer or spray pipe is opened, etc. Under the same flue gas, the outlet SO2 content values for different levels are recorded as n i . The spray control strategy and n i are both stored in the PLC controller 14. The predefined SO2 content value for the current spray level is n1, and calculate the comparison coefficient value (n1 - n i ) / n1 for different levels above, and find the comparison coefficient value closest to (y - y0) / y0.

[0122] A3. Control the spray system of the desulfurization tower 5 through the PLC controller 14, map the comparison coefficient value from the previous step to the corresponding control strategy, and adjust the spray system to the corresponding spray level.

[0123] A4. Detect whether the sulfur content after desulfurization treatment is qualified, that is, whether it satisfies y ≤ y0.

[0124] A5. If y ≤ y0 is satisfied, open the first electric valve 11, close the induced draft fan 10 and the second electric valve 12, and the third electric valve 13. The flue gas flows out from the first electric valve 11, undergoes dust removal treatment, and then after heating, is discharged through the chimney 9.

[0125] If y > y0, increase the spray level of the spray system of the desulfurization tower 5 by one level, and then repeat step A4.

[0126] As Figure 5 shown, if the SO2 content meets the standard (y ≤ y0) and the NO x content exceeds the standard (x > x0), use the second emission over - standard treatment process. The second emission over - standard treatment process includes the following steps:

[0127] B1. Close the first electric valve 11 and the third electric valve 13, and open the induced draft fan 10 and the second electric valve 12; at this time, the flue gas that does not meet the emission standard flows back through the induced draft fan 10, passes through the second electric valve 12, and enters the first flue gas heater 1 and the front - end inlet of the heater.

[0128] B2. Calculate the coefficient by which the NO x exceeds the standard, and the formula is (x - x0) / x0; the currently measured NO x content is the x value, and the NO x content value that meets the emission standard is the x0 value. The spray system of the first flue gas heater 1 has set many levels, and the control strategies for different levels are different. For example, the ammonia injection amount is different, whether the standby ammonia injection layer or ammonia injection pipe is opened, etc. Under the same flue gas, the outlet NO x content values for different levels are recorded as m i . The ammonia injection control strategy and m i here are both stored in the PLC controller 14. The predefined NO x content value for the current ammonia injection level is m1. Calculate the comparison coefficient values for different levels above ((m1 - m i ) / m1), and find the comparison coefficient value closest to (x - x0) / x0.

[0129] B3. Control the spray system of the first flue gas heater 1 through the PLC controller 14, map the comparison coefficient value obtained in the previous step to the corresponding control strategy, and adjust the spray system of the first flue gas heater 1 to the corresponding ammonia injection level.

[0130] B4. Detect whether the nitrate content after denitrification treatment is qualified, that is, whether it satisfies x ≤ x0

[0131] B5. If x ≤ x0 is satisfied, open the first electric valve 11, close the induced draft fan 10, the second electric valve 12, and the third electric valve 13. The flue gas flows out from the first electric valve 11, undergoes dust removal treatment, and then after heating, is discharged through the chimney 9.

[0132] If x > x0, increase the spray level of the spray system of the first flue gas heater 1 by one level, and then repeat the steps of the S2 dust collector 4.

[0133] If the SO2 content exceeds the standard (y > y0), NO x content exceeds the standard (x > x0), use the third emission over-standard treatment process, and the third emission over-standard treatment process includes the following steps:

[0134] At this time, open the induced draft fan 10, the second electric valve 12, and the third electric valve 13, close the first electric valve 11, and at the same time execute the first emission over-standard treatment process and the second emission over-standard treatment process.

[0135] As Figure 6 shown, when the NO x content meets the standard (x ≤ x0), and in the case of a decrease in the flue gas inlet concentration and flow rate, the spray system of the first flue gas heater 1 also needs to be dynamically adjusted in level and downgraded, so as to continuously operate in the most economical state and improve economic benefits.

[0136] The dynamic level adjustment of the spray system of the first flue gas heater 1 includes the following steps:

[0137] Step 1: Calculate the NO x surplus coefficient, and the formula is (x0 - x) / x. A predefined safety coefficient value m0 is set in the control system. When the NOx surplus coefficient value falls within the safety coefficient range, it means that the current spray level of the first flue gas heater 1 is already in the best state, and at this time, the first flue gas heater 1 operates at this ammonia injection level.

[0138] Step 2: When the NO x surplus coefficient value exceeds the safety coefficient, lower the ammonia injection level of the spray system by one level. The specific control strategy includes reducing the ammonia injection amount, closing the standby ammonia injection layer or ammonia injection pipe, etc. Then detect the outlet NO x content and repeat Step 1.

[0139] As Figure 7 shown, when the SO2 content meets the standard (y ≤ y0), and in the case of a decrease in the flue gas inlet concentration and flow rate, the spray system of the desulfurization tower 5 also needs to be dynamically adjusted in level and downgraded, so as to continuously operate in the most economical state and improve economic benefits.

[0140] The dynamic level adjustment of the spray system of the desulfurization tower 5 includes the following steps:

[0141] Step 1: Calculate the SO2 surplus coefficient, with the formula being (y0 - y) / y. A predefined safety coefficient value n0 is set in the control system. When the SO2 surplus coefficient value falls within the safety coefficient range, it indicates that the current spray system level of the desulfurization tower 5 is already in the optimal state, and at this time, the desulfurization tower 5 operates at this spray level.

[0142] Step 2: When the SO2 surplus coefficient value exceeds the safety coefficient, lower the spray level of the spray system by one level. The specific control strategies include reducing the spray volume, closing the standby spray layer or spray pipe, etc. Then, detect the SO2 content at the outlet and repeat the previous step.

[0143] Example Five:

[0144] As Figure 8-13 shown, in this example, one of the spray systems of the denitration tower 2 or the desulfurization tower 5 is disclosed on the basis of Example One. Specifically, the spray system includes an inner cavity adjustment mechanism and a dynamic spray mechanism;

[0145] Both the denitration tower 2 and the desulfurization tower 5 include a tower body 15. The inner cavity adjustment mechanism includes six blocks 19 installed inside the tower body 15. The six blocks 19 are arranged in a circular array. The space between the multiple blocks 19 is the flue gas flow inner cavity. The side of the block 19 close to the flue gas flow inner cavity is the contact surface 23. The side of the block 19 located adjacent to the contact surface 23 in the clockwise direction is the sliding inclined surface 24. The contact surfaces 23 and the sliding inclined surfaces 24 of two adjacent blocks 19 are slidably connected, enabling the block 19 to slide along the direction of its sliding inclined surface 24. By synchronously adjusting the positions of the six blocks 19, the inner diameter of the flue gas flow inner cavity can be controlled to match the amount of flue gas, allowing the flue gas to evenly fill the inside of the flue gas flow inner cavity, and making the space of the flue gas flow inner cavity, the amount of flue gas, and the amount of the agent sprayed by the dynamic spray mechanism be in a proportional setting, so that the agent sprayed by the dynamic spray mechanism can evenly contact the flue gas inside the flue gas flow inner cavity for denitration or desulfurization treatment, reducing the phenomenon that when the space of the flue gas flow inner cavity is too large, a larger amount of agent needs to be sprayed to ensure that the flue gas can effectively react with the agent, and reducing the waste of the agent.

[0146] Specifically, two annular sealing plates 18 are fixedly connected inside the tower body 15. The two annular sealing plates 18 are respectively located above and below the block 19. At this time, the annular sealing plates 18 can seal the gap between the block 19 and the tower body 15. Six guiding grooves 21 are opened on the annular sealing plates 18. The upper and lower ends of the block 19 are fixedly connected with round rods 22. The round rods 22 are slidably connected inside the guiding grooves 21 to control the sliding direction of the block 19;

[0147] On the inner wall of the tower body 15, an electric push rod 20 is fixedly connected. The piston rod of the electric push rod 20 is fixedly connected to the stopper 19. At this time, the stopper 19 can be driven to move by the electric push rod 20.

[0148] Among them, the dynamic spraying mechanism includes a positioning bracket 17 fixedly connected inside the tower body 15. A turntable 26 located at the axis of the flue gas flow cavity is rotatably connected to the positioning bracket 17. Six second elastic telescopic rods 31 are rotatably connected to the circumferential side of the turntable 26. One end of the second elastic telescopic rod 31 far from the turntable 26 is fixedly connected to an arc-shaped pipe 27. Adjacent two arc-shaped pipes 27 are connected and communicated through a second hose 29. A spray head 28 is fixedly connected to the lower side of the arc-shaped pipe 27. A feed pipe 16 is fixedly connected to the tower body 15. The feed pipe 16 and one of the arc-shaped pipes 27 are connected and communicated through a first hose 25. At this time, the agent is input into the arc-shaped pipe 27 through the first hose 25, and then sprayed into the flue gas flow cavity through the spray head 28. The first hose 25 is connected to a delivery pump. By controlling the power of the delivery pump, the spraying amount can be adjusted.

[0149] In order to dynamically adjust the position of the spray head 28 so that the spray heads 28 are evenly distributed inside the flue gas flow cavity, the arc-shaped pipe 27 is connected to the position on the contact surface 23 close to the sliding inclined surface 24 through a first elastic telescopic rod 30. Both the arc-shaped pipe 27 and the contact surface 23 are rotatably connected to the first elastic telescopic rod 30. At this time, under the elastic force of the first elastic telescopic rod 30 and the second elastic telescopic rod 31, the position of the arc-shaped pipe 27 can be automatically adjusted.

[0150] Specifically, both the first elastic telescopic rod 30 and the second elastic telescopic rod 31 include a sleeve 32. One end of the sleeve 32 is rotatably connected to the turntable 26 or the arc-shaped pipe 27. A slide rod 33 is slidably connected inside the sleeve 32. One end of the slide rod 33 is rotatably connected to the arc-shaped pipe 27 or the contact surface 23. A return spring 34 is installed inside the sleeve 32 to apply an elastic thrust to the slide rod 33.

[0151] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention, unless otherwise specifically described and defined, are implemented according to the conventional means in the art.

Claims

1. A desulfurization and denitrification method, characterized in that: It includes the following steps: S1. Heat the flue gas through the first flue gas heater (1), and then carry out denitrification treatment through the denitration tower (2); S2. Cool the denitrified flue gas through the flue gas cooler (3), and after the cooling is completed, carry out dust removal treatment on the flue gas through the dust collector (4); S3. Transport the flue gas into the desulfurization tower (5) for desulfurization treatment; In S4, the flue gas after desulfurization treatment enters the flue gas analyzer (6), and the SO2 content in the flue gas is detected and recorded in real time as the y value, and the NO x content in the flue gas is detected and recorded in real time as the x value. The SO2 content value meeting the emission standard is recorded as the y0 value, and the NO x content value meeting the emission standard is recorded as the x0 value; S5. If the sulfur content and nitrate content of the flue gas both meet the discharge standard values, open the first electric valve (11), close the second electric valve (12) and the third electric valve (13), stop the induced draft fan (10), the flue gas flows out from the first electric valve (11), is subjected to dust removal treatment by the dust collector (7), and then is heated by the second flue gas heater (8) and discharged through the chimney (9); If any one of the sulfur content and nitrate content in the flue gas does not meet the discharge standard value, the desulfurization and denitrification discharge over-standard treatment process shall be executed.

2. A desulfurization and denitrification method, characterized in that: It includes the following steps: Step 1. Cool the high-temperature flue gas through the flue gas cooler (3), and then carry out dust removal treatment through the dust collector (4); Step 2. Carry out flue gas desulfurization treatment through the desulfurization tower (5); Step 3. Heat the desulfurized flue gas through the first flue gas heater (1), and then enter the denitration tower (2) for denitration treatment; Step 4, the flue gas after denitrification treatment enters the flue gas analyzer (6), and the SO2 content in the flue gas is detected and recorded in real time as the y value, and the NO x content is detected and recorded in real time as the x value, the SO2 content value meeting the emission standard is recorded as the y0 value, and the NO x content value meeting the emission standard is recorded as the x0 value; Step 5. If the sulfur content and nitrate content of the flue gas both meet the discharge standard values, set the first electric valve (11) to open, close the second electric valve (12) and the third electric valve (13), stop the induced draft fan (10), the flue gas flows out from the first electric valve (11), is subjected to dust removal treatment, and then is heated and discharged through the chimney (9); If any one of the sulfur content and nitrate content in the flue gas does not meet the discharge standard value, the desulfurization and denitrification discharge over-standard treatment process shall be executed.

3. A desulfurization and denitrification method according to any one of claims 1-2, characterized in that: The discharge over-standard treatment process includes discharge over-standard treatment process one, discharge over-standard treatment process two, and discharge over-standard treatment process three; If the SO2 content exceeds the standard and the NO x content meets the standard, use Emission Exceedance Treatment Process 1, which includes the following steps: A1. Close the first electric valve (11) and the second electric valve (12), and open the induced draft fan (10) and the third electric valve (13); at this time, the flue gas that does not meet the discharge standard flows back through the induced draft fan (10) and enters the inlet of the desulfurization tower (5) through the third electric valve (13); A2. Calculate the coefficient of SO2 exceeding the standard, with the formula (y - y0) / y0. The currently measured SO2 content is the y value, and the SO2 content value meeting the emission standard is the y0 value. Under the same flue gas, the outlet SO2 content values at different levels are recorded as n i , and the spray control strategy and n are stored in the PLC controller (14) i , the predefined SO2 content value at the current spray level is n1. Calculate the comparison coefficient values (n1 - n i ) / n1 at different levels above, and find the comparison coefficient value closest to (y - y0) / y0; A3. Control the spray system of the desulfurization tower (5) through the PLC controller (14), map the comparison coefficient value in step A2 to the corresponding control strategy, and adjust the spray system to the corresponding spray level; A4. Detect whether the sulfur content after desulfurization treatment is qualified, that is, whether it meets y≤y0; A5. If it meets y≤y0, open the first electric valve (11), close the induced draft fan (10) and the second electric valve (12) and the third electric valve (13), the flue gas flows out from the first electric valve (11), is subjected to dust removal treatment, and then is discharged through the chimney (9) after being heated; If y>y0, raise the spray level of the spray system of the desulfurization tower (5) by one level, and then repeat step A4; If the SO2 content meets the standard (y ≤ y0), and the NO x content exceeds the standard, use Emission Exceeding Standard Treatment Process 2, which includes the following steps: B1. Close the first electric valve (11) and the third electric valve (13), and open the induced draft fan (10) and the second electric valve (12); at this time, the flue gas that does not meet the emission standard flows back through the induced draft fan (10), passes through the second electric valve (12), and enters the first flue gas heater (1). B2, Calculate NO x Coefficient exceeding the standard, formula: (x - x0) / x0; currently measured NO x Content is x value, NO content meeting the emission standard x Content value is x0 value. Under the same flue gas, different levels of outlet NO content values are recorded x Content value is m i , The PLC controller (14) stores the ammonia injection control strategy and m i , Predefined NO content value for the current ammonia injection level x Content value is m1. Calculate the comparison coefficient value (m1 - m i ) / m1 under different levels above, and find the comparison coefficient value closest to (x - x0) / x0 B3. Control the spray system of the first flue gas heater (1) through the PLC controller (14), map the comparison coefficient value in step B2 to the corresponding control strategy, and adjust the spray system of the first flue gas heater (1) to the corresponding ammonia injection level. B4. Detect whether the nitrate content after denitrification treatment is qualified, whether it satisfies x ≤ x0 B5. If x ≤ x0 is satisfied, open the first electric valve (11), close the induced draft fan (10) and the second electric valve (12), the third electric valve (13), the flue gas flows out from the first electric valve (11), after dust removal treatment, and then after heating, it is discharged through the chimney (9). If x > x0, increase the spray level of the spray system of the first flue gas heater (1) by one level, and then repeat step B4. If the SO2 content exceeds the standard (y > y0) and the NO x content exceeds the standard (x > x0), use the third emission over-standard treatment process, which includes the following steps: Open the induced draft fan (10) and the second electric valve (12), the third electric valve (13), close the first electric valve (11), and at the same time execute the first emission over-standard treatment process and the second emission over-standard treatment process.

4. The desulfurization and denitrification method according to claim 3, characterized in that: In the case of NO x When the content meets the standard x ≤ x0, and the flue gas inlet concentration and flow rate decrease, the spraying system of the first flue gas heater (1) makes a dynamic level adjustment; The dynamic level adjustment of the spray system of the first flue gas heater (1) includes the following steps: Step 1: Calculate NO x The surplus coefficient, with the formula (x0 - x) / x, and a predefined safety coefficient value m0. When NO x The value of the surplus coefficient falls within the safety coefficient range, indicating that the current spray ammonia level of the first flue gas heater (1) is already in the optimal state. At this time, the first flue gas heater (1) operates at this spray ammonia level; Step 2: When NO x The surplus coefficient value exceeds the safety coefficient, then lower the ammonia spraying level of the spraying system by one level, and then detect the outlet NO x content and repeat Step 1; When the SO2 content meets the standard y ≤ y0, and when the flue gas inlet concentration and flow rate decrease, the spray system of the desulfurization tower (5) performs dynamic level adjustment. The dynamic level adjustment of the spray system of the desulfurization tower (5) includes the following steps: Step 1: Calculate the SO2 surplus coefficient, the formula is (y0 - y) / y, pre-define the safety coefficient value n0, when the SO2 surplus coefficient value falls within the safety coefficient range, it means that the current spray system level of the desulfurization tower (5) is already in the optimal state, and at this time the desulfurization tower (5) maintains this spray level operation. Step 2: When the SO2 surplus coefficient value exceeds the safety coefficient, lower the spray level of the spray system by one level, then detect the outlet SO2 content and repeat the previous step.

5. A desulfurization and denitrification device, applied to the desulfurization and denitrification method described in any one of claims 1-2, characterized in that: It includes a desulfurization mechanism, a denitrification mechanism, a flue gas analyzer (6), a dust removal and emission mechanism, and a PLC controller (14). The denitrification mechanism includes a first flue gas heater (1) and a denitrification tower (2) connected in sequence through a pipeline. The desulfurization mechanism includes a flue gas cooler (3), a dust collector (4), and a desulfurization tower (5) connected in sequence through a pipeline. The denitrification mechanism and the desulfurization mechanism are connected through a pipeline. One of the desulfurization mechanism and the denitrification mechanism is connected to the flue gas analyzer (6). The pipeline between the flue gas analyzer (6) and the dust removal and emission mechanism is the first connecting pipe, the pipeline between the dust collector (4) and the desulfurization tower (5) is the second connecting pipe, the input end of the first flue gas heater (1) is fixedly connected with a feed pipe, and a first electric valve (11) is installed on the first connecting pipe. The position of the first connecting pipe in front of the first electric valve (11) is connected to the induced draft fan (10) through a pipeline, the induced draft fan (10) is connected to the feed pipe through a third connecting pipe, and a second electric valve (12) is fixedly connected to the third connecting pipe. The induced draft fan (10) is connected through a fourth connecting pipe and a second connecting pipe, and a third electric valve (13) is fixedly connected to the second connecting pipe; Spraying systems are arranged inside both the denitration tower (2) and the desulfurization tower (5); The denitration tower (2), desulfurization tower (5), flue gas analyzer (6), induced draft fan (10), first electric valve (11), second electric valve (12), and third electric valve (13) are all electrically connected to the PLC controller (14). The flue gas analyzer (6) is used to detect the SO2 content and NO x content in the desulfurized flue gas.

6. The desulfurization and denitrification device according to claim 5, characterized in that: The dust removal and emission mechanism includes a dust collector (7), a second flue gas heater (8) and a chimney (9) that are sequentially connected through a pipeline, and the first connecting pipe is connected to the dust collector (7).

7. A desulfurization and denitrification device according to any one of claims 5, characterized in that: The spraying system includes an inner cavity adjusting mechanism and a dynamic spraying mechanism; Both the denitration tower (2) and the desulfurization tower (5) include a tower body (15). The inner cavity adjusting mechanism includes six blocking blocks (19) installed inside the tower body (15). The six blocking blocks (19) are arranged in a circular array. The space between the multiple blocking blocks (19) is the flue gas flow inner cavity. The side of the blocking block (19) close to the flue gas flow inner cavity is the contact surface (23). The side of the blocking block (19) adjacent to the contact surface (23) in the clockwise direction is the sliding inclined surface (24). The contact surfaces (23) and the sliding inclined surfaces (24) of adjacent two blocking blocks (19) are slidably connected, and the blocking block (19) can slide along the direction of its sliding inclined surface (24); Two annular sealing plates (18) are fixedly connected inside the tower body (15). The two annular sealing plates (18) are respectively located above and below the blocking block (19). Six guiding grooves (21) are formed in the annular sealing plate (18). Round rods (22) are fixedly connected to the upper end and the lower end of the blocking block (19), and the round rods (22) are slidably connected inside the guiding grooves (21); An electric push rod (20) is fixedly connected to the inner wall of the tower body (15), and the piston rod of the electric push rod (20) is fixedly connected to the blocking block (19).

8. A desulfurization and denitrification device according to claim 7, characterized in that: The dynamic spraying mechanism includes a positioning bracket (17) fixedly connected inside the tower body (15). A turntable (26) located at the axis of the flue gas flow inner cavity is rotatably connected to the positioning bracket (17). Six second elastic telescopic rods (31) are rotatably connected to the circumferential side of the turntable (26). The end of the second elastic telescopic rod (31) far from the turntable (26) is fixedly connected to an arc-shaped pipe (27). Adjacent two arc-shaped pipes (27) are connected through a second hose (29). Spraying heads (28) are fixedly connected to the lower side of the arc-shaped pipe (27). A feed pipe (16) is fixedly connected to the tower body (15), and the feed pipe (16) is connected to one of the arc-shaped pipes (27) through a first hose (25); The arc-shaped pipe (27) is connected to the position on the contact surface (23) close to the sliding inclined surface (24) through a first elastic telescopic rod (30), and both the arc-shaped pipe (27) and the contact surface (23) are rotatably connected to the first elastic telescopic rod (30).

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