Denitration device of circulating fluidized bed boiler

Abstract

The utility model discloses a denitration device of a circulating fluidized bed boiler, the denitration device comprises at least two urea solution conveying pipes and at least two urea solution spray guns, the at least two urea solution conveying pipes are arranged in parallel, and each urea solution conveying pipe is provided with a urea solution inlet and a washing liquid outlet; a spray gun connecting opening is formed in the pipe wall, located between the urea solution inlet and the washing liquid outlet, of the urea solution conveying pipe, the urea solution spray gun is connected with the spray gun connecting opening and communicated with the urea solution inlet, and each urea solution conveying pipe is provided with a first switch valve; and the first switch valve is positioned between the spray gun connector and the washing liquid outlet. According to the scheme, the problem that the denitration effect of the denitration device is affected due to the fact that the urea solution conveying pipe of the denitration device of the circulating fluidized bed boiler involved in the related technology is prone to being blocked can be solved.

Description

Technical Field

[0001] The present application belongs to the technical field of circulating fluidized bed boiler design, and in particular relates to a denitration device for a circulating fluidized bed boiler. Background Art

[0002] The denitrification device is used to denitrify the flue gas generated by the circulating fluidized bed boiler during operation to reduce pollution to the environment. For example, the denitrification device can achieve denitrification of the flue gas through urea.

[0003] The end of the urea solution delivery pipe in the denitrification device involved in the related art is a blind pipe. Long-term use of the urea solution delivery pipe is likely to cause urea crystals to deposit at the end of the urea solution delivery pipe, thereby blocking the urea solution delivery pipe, thereby easily affecting the flow rate of the urea solution output from the urea solution delivery pipe, resulting in an unbalanced flow rate of the urea solution output from the urea solution delivery pipe, and thus making it difficult to achieve uniform denitrification, which is likely to affect the denitrification effect of the denitrification device. Utility Model Content

[0004] The utility model discloses a denitration device for a circulating fluidized bed boiler, so as to solve the problem that a urea solution conveying pipe of a denitration device for a circulating fluidized bed boiler involved in the related art is easily blocked, thus affecting the denitration effect of the denitration device.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] The present application discloses a denitration device for a circulating fluidized bed boiler, the disclosed denitration device comprises at least two urea solution delivery pipes and at least two urea solution spray guns, the at least two urea solution delivery pipes are arranged in parallel, each of the urea solution delivery pipes is provided with a urea solution inlet and a flushing drain port, a spray gun connection port is provided on the pipe wall of the urea solution delivery pipe between the urea solution inlet and the flushing drain port, the urea solution spray gun is connected to the spray gun connection port, the urea solution spray gun is communicated with the urea solution inlet, each of the urea solution delivery pipes is provided with a first switch valve, the first switch valve is located between the spray gun connection port and the flushing drain port; wherein,

[0007] When the first switch valve is in a connected state, the flushing drain port is connected to the urea solution inlet;

[0008] When the first switch valve is in the disconnected state, the flushing drain port is isolated from the urea solution inlet, and the flushing drain port is isolated from the urea solution spray gun.

[0009] The technical solution adopted by the utility model can achieve the following technical effects:

[0010] The denitrification device of a circulating fluidized bed boiler disclosed in the embodiment of the present application improves the structure of the denitrification device involved in the related art, and sets a first switch valve on each urea solution delivery pipe, and sets the first switch valve between the spray gun connection port and the flushing drain port, so that the connection and disconnection between the flushing drain port and the urea solution inlet can be controlled by switching the state of the first switch valve, and the first switch valve can be prevented from affecting the connection between the spray gun connection port and the urea solution inlet. In this structure, when the first switch valve is in a connected state, the flushing drain port can be connected to the urea solution inlet, so that urea crystals in the urea solution delivery pipe can be flushed by the urea solution and discharged from the urea solution delivery pipe together with the urea solution from the flushing drain port, thereby avoiding blockage of the urea solution delivery pipe and easily affecting the connection between the spray gun connecting port and the urea solution inlet, so as to avoid affecting the flow rate of the urea solution sprayed from the urea solution spray gun, thereby avoiding the situation where the flow rate of the urea solution sprayed by the urea solution spray guns connected to each urea solution delivery pipe is unbalanced, so as to achieve uniform denitrification, thereby avoiding affecting the denitrification effect of the denitrification device. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a partial structural schematic diagram of the first denitration device of a circulating fluidized bed boiler disclosed in the embodiment of the present application;

[0012] Figure 2 It is a partial structural schematic diagram of a second circulating fluidized bed boiler denitration device disclosed in an embodiment of the present application;

[0013] Figure 3 It is a structural schematic diagram of a third circulating fluidized bed boiler denitration device disclosed in an embodiment of the present application;

[0014] Figure 4 It is a structural schematic diagram of a fourth circulating fluidized bed boiler denitration device disclosed in an embodiment of the present application;

[0015] Figure 5 It is a structural schematic diagram of a fifth circulating fluidized bed boiler denitration device disclosed in an embodiment of the present application;

[0016] Figure 6 It is a structural schematic diagram of a sixth circulating fluidized bed boiler denitration device disclosed in an embodiment of the present application;

[0017] Figure 7 It is a partial structural schematic diagram of a seventh circulating fluidized bed boiler denitration device disclosed in an embodiment of the present application;

[0018] Figure 8 This is a partial structural schematic diagram of the eighth circulating fluidized bed boiler denitration device disclosed in the embodiment of the present application, wherein it should be noted that: Figure 2 , Figure 4 , Figure 5 , Figure 7 The dotted lines in the figure indicate the control connections between the corresponding components.

[0019] Description of reference numerals:

[0020] 110-urea solution delivery pipe, 111-urea solution inlet, 112-flushing drainage port, 113-spray gun connection port, 120-flushing drainage main pipe, 130-connecting pipeline,

[0021] 200-urea solution spray gun,

[0022] 310 - first switch valve, 320 - second switch valve, 330 - third switch valve,

[0023] 400-controller,

[0024] 510 - urea solution container, 511 - first cavity space, 512 - second cavity space, 520 - flushing waste liquid container,

[0025] 600-Detection devices,

[0026] 710-first heater, 720-second heater,

[0027] 800-driving mechanism,

[0028] 900-Stirring device,

[0029] 1000-Crystal filtration components,

[0030] 1100-Pipeline inner diameter detection department,

[0031] 1200-Fluidizing fan. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] The terms "first" and "second" in the description and claims of this application may explicitly or implicitly include one or more of the features.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Please refer to Figures 1 to 8 The embodiment of the present application discloses a denitration device for a circulating fluidized bed boiler. The disclosed denitration device includes at least two urea solution delivery pipes 110 and at least two urea solution spray guns 200 .

[0036] like Figure 1 As shown, the urea solution delivery pipe 110 is a core component for delivering urea solution in the denitration device. At least two urea solution delivery pipes 110 are arranged in parallel, so that the urea solution in the urea solution container 510 of the denitration device described later can be distributed to the multiple urea solution delivery pipes 110 to improve the delivery capacity of the denitration device, and it is also beneficial to spray the urea solution in different areas through the urea solution spray guns 200 arranged on each of them to achieve more balanced denitration.

[0037] Each urea solution delivery pipe 110 is provided with a urea solution inlet 111 and a flushing drain port 112. The urea solution inlet 111 is used to allow the urea solution to flow into the urea solution delivery pipe 110. Of course, the flushing drain port 112 is located downstream of the urea solution inlet 111. The pipe wall of the urea solution delivery pipe 110 between the urea solution inlet 111 and the flushing drain port 112 is provided with a spray gun connection port 113, that is, the spray gun connection port 113 is not only downstream of the urea solution inlet 111, but also upstream of the flushing drain port 112. The spray gun connection port 113 is used to connect the urea solution spray gun 200, so that the urea solution in the urea solution delivery pipe 110 can flow into the urea solution spray gun 200 through the spray gun connection port 113, so that the urea solution in the urea solution delivery pipe 110 can be sprayed into the external environment through the urea solution spray gun 200 for denitration reaction.

[0038] In addition, the urea solution and urea crystals in the urea solution delivery pipe 110 can be discharged through the flushing drain port 112, so as to avoid the urea crystals being deposited in the urea solution delivery pipe 110 and easily clogging the urea solution delivery pipe 110, thereby avoiding affecting the flow rate of the urea solution sprayed from the urea solution spray gun 200. The urea solution in the urea solution delivery pipe 110 can be sprayed into the external environment through the urea solution spray gun 200 for denitrification reaction, thereby avoiding the flow rate of the urea solution sprayed from the urea solution spray gun 200 being unbalanced, thereby avoiding affecting the denitrification effect of the denitrification device.

[0039] The urea solution spray gun 200 is a core component in the denitration device for spraying urea solution into the external environment. The urea solution spray gun 200 is connected to the spray gun connection port 113, and the urea solution spray gun 200 is communicated with the urea solution inlet 111, so that the urea solution in the urea solution delivery pipe 110 can flow into the urea solution spray gun 200 through the spray gun connection port 113, so that the urea solution in the urea solution delivery pipe 110 can be sprayed into the external environment through the urea solution spray gun 200 for denitration reaction. Among them, the urea solution spray gun 200 can spray the urea solution in the form of rain and mist, so that the urea solution can be more fully mixed with the flue gas generated in the thermal power generation process, so that it can react more efficiently, and then it can denitrate more efficiently.

[0040] The first switch valve 310 is used to control the connection between the flushing drain port 112 and the urea solution inlet 111. Each urea solution delivery pipe 110 is provided with a first switch valve 310, and the first switch valve 310 is located between the spray gun connection port 113 and the flushing drain port 112, that is, the first switch valve 310 is not only located downstream of the spray gun connection port 113, but also located upstream of the flushing drain port 112. This structure enables the connection between the flushing drain port 112 and the urea solution inlet 111 to be controlled by switching the state of the first switch valve 310, and at the same time, the first switch valve 310 does not affect the connection between the spray gun connection port 113 and the urea solution inlet 111, that is, no matter whether the first switch valve 310 is in a connected state or a disconnected state, the urea solution in the urea solution delivery pipe 110 can flow out from the spray gun connection port 113.

[0041] In a specific working process, when the first switch valve 310 is in a connected state, the flushing drain port 112 is connected to the urea solution inlet 111, and the urea crystals in the urea solution delivery pipe 110 can be flushed by the urea solution and discharged from the urea solution delivery pipe 110 together with the urea solution from the flushing drain port 112, thereby preventing the urea crystals from being deposited in the urea solution delivery pipe 110 and clogging the urea solution delivery pipe 110. In this case, a part of the urea solution in the urea solution delivery pipe 110 will still enter the urea solution spray gun 200 to participate in the subsequent denitration work, and the other part of the urea solution plays a role in flushing the urea crystals in the urea solution delivery pipe 110.

[0042] When the first switch valve 310 is in the disconnected state, the flushing drain port 112 is isolated from the urea solution inlet 111, and the flushing drain port 112 is isolated from the urea solution spray gun 200, and the urea solution and urea crystals in the urea solution delivery pipe 110 will not be discharged from the urea solution delivery pipe 110 through the flushing drain port 112. Specifically, the engineering and technical personnel can adjust the state of the first switch valve 310 according to actual needs. When the flushing work is completed, the urea crystals are flushed away, and at this time, the first switch valve 310 can be controlled to be in the disconnected state, so that the urea solution will not continue to flow away from the flushing drain port 112, but will all enter the corresponding urea solution spray gun 200, and then participate in the subsequent denitration work.

[0043] The denitrification device of a circulating fluidized bed boiler disclosed in the embodiment of the present application improves the structure of the denitrification device involved in the related art, and sets a first switch valve 310 on each urea solution delivery pipe 110. The first switch valve 310 is set between the spray gun connection port 113 and the flushing drain port 112, so that the connection between the flushing drain port 112 and the urea solution inlet 111 can be controlled by switching the state of the first switch valve 310, and the first switch valve 310 can be prevented from affecting the connection between the spray gun connection port 113 and the urea solution inlet 111.

[0044] In this structure, when the first switch valve 310 is in a connected state, the flushing drain port 112 can be connected to the urea solution inlet 111, so that the urea crystals in the urea solution delivery pipe 110 can be flushed by the urea solution and discharged from the urea solution delivery pipe 110 together with the urea solution from the flushing drain port 112, thereby avoiding the blockage of the urea solution delivery pipe 110, which may easily affect the connection between the spray gun connection port 113 and the urea solution inlet 111, so as to avoid affecting the flow rate of the urea solution sprayed from the urea solution spray gun 200, thereby avoiding the situation where the flow rate of the urea solution sprayed from the urea solution spray gun 200 is uneven, so as to achieve uniform denitration, thereby avoiding affecting the denitration effect of the denitration device.

[0045] In addition, in a specific working process, when the flow rate of urea solution sprayed by multiple urea solution spray guns 200 is uneven, in order to achieve the expected denitration effect, it is necessary to increase the flow rate of urea solution sprayed by all urea solution spray guns 200, so that the urea solution spray gun 200 with the smallest flow rate of urea solution sprayed among the multiple urea solution spray guns 200 can reach the expected flow rate, which easily leads to an increase in the usage of urea solution in the denitration device, thereby causing an increase in cost. The present application can avoid the situation where the flow rate of urea solution sprayed from the urea solution spray gun 200 is uneven, thereby avoiding further increasing the usage of urea solution and avoiding increased costs.

[0046] In a further technical solution, Figure 2 As shown, the denitrification device may further include a flushing drainage main pipe 120, and the flushing drainage ports 112 of at least two urea solution delivery pipes 110 may be connected to the flushing drainage main pipe 120, that is, the flushing drainage main pipe 120 is located downstream of each urea solution delivery pipe 110, and the flushing drainage main pipe 120 may be provided with a second switch valve 320 for controlling the on-off of the flushing drainage main pipe 120 (i.e., the flushing drainage main pipe 120), so that the on-off of the flushing drainage main pipe 120 can be controlled by switching the state of the second switch valve 320.

[0047] In a specific working process, when the second switch valve 320 is in an open state, the flushing drain port 112 can be connected to the external environment through the flushing drain main pipe 120, so that when the flushing drain port 112 of each urea solution delivery pipe 110 is connected to the corresponding urea solution inlet 111 (that is, when the corresponding first switch valve 310 is in a connected state), urea crystals and urea solution can be discharged into the external environment through the flushing drain main pipe 120.

[0048] Specifically, the engineering and technical personnel can determine the discharge of urea crystals in the urea solution delivery pipe 110 by observing the content of urea crystals discharged from the flushing and draining main pipe 120 to the external environment and the urea crystals in the urea solution, so as to close the second switch valve 320 in time after the urea crystals in the urea solution delivery pipe 110 are completely discharged, so as to switch the second switch valve 320 to a closed state to avoid wasting urea solution.

[0049] Of course, when the flushing drain port 112 of each urea solution delivery pipe 110 is isolated from the corresponding urea solution inlet 111 (i.e., when the corresponding first switch valve 310 is in the disconnected state), the urea crystals and urea solution in each urea solution delivery pipe 110 will not be discharged from the urea solution delivery pipe 110 through the flushing drain port 112, so that the urea crystals and urea solution in each urea solution delivery pipe 110 will not be discharged into the flushing drain main pipe 120 downstream of the urea solution delivery pipe 110.

[0050] When the second switch valve 320 is in the closed state, the flushing drainage main pipe 120 is isolated from the external environment. In this case, no matter the flushing drainage port 112 of each urea solution delivery pipe 110 is connected to the corresponding urea solution inlet 111 (that is, the corresponding first switch valve 310 is in the connected state), or the flushing drainage port 112 of each urea solution delivery pipe 110 is isolated from the corresponding urea solution inlet 111 (that is, the corresponding first switch valve 310 is in the disconnected state), the urea crystals and urea solution in each urea solution delivery pipe 110 will not be discharged into the external environment through the flushing drainage main pipe 120.

[0051] In addition, in this structure, when the first switch valve 310 fails and is difficult to adjust to the disconnected state, the second switch valve 320 can be adjusted to the closed state to avoid the urea crystals and urea solution in the corresponding urea solution delivery pipe 110 from being discharged into the external environment. Alternatively, when the second switch valve 320 fails and is difficult to adjust to the closed state, the first switch valve 310 can be adjusted to the disconnected state to avoid the urea crystals and urea solution in the corresponding urea solution delivery pipe 110 from being discharged into the external environment. This can form a double guarantee and is beneficial to improving the reliability of the denitrification device.

[0052] In the specific operation process, an operation button can be set on the second switch valve 320 to manually switch the state of the second switch valve 320. This structure is relatively simple and easy to implement. Figure 2 In order to improve the degree of automation of the denitrification device, the second switch valve 320 can be a second electrically controlled valve, and the denitrification device can also include a controller 400. The controller 400 can be electrically connected to the second electrically controlled valve, so that the controller 400 can control the second electrically controlled valve to switch between an open state and a closed state.

[0053] In a specific working process, when the first switch valve 310 is in a connected state, the controller 400 can control the second electrically controlled valve to open at a preset opening frequency, and the opened second electrically controlled valve is in an open state, so that the urea crystals and the urea solution in the urea solution delivery pipe 110 can be discharged into the external environment by flushing the drainage main pipe 120, so that the urea solution delivery pipe 110 can automatically clean the urea crystals in the urea solution delivery pipe 110 according to the preset opening frequency, so that the urea solution can form a pulse impact, which is conducive to the urea crystals falling off from the pipe wall of the urea solution delivery pipe 110.

[0054] like Figure 3 As shown, in an optional technical solution, the denitration device may further include a urea solution container 510 and a flushing waste liquid container 520. The urea solution inlets 111 of at least two urea solution delivery pipes 110 may be connected to the urea solution container 510, for example, the urea solution inlets 111 of at least two urea solution delivery pipes 110 are directly connected to the urea solution container 510, so that the urea solution in the urea solution container 510 can flow into each urea solution delivery pipe 110. The flushing drain ports 112 of at least two urea solution delivery pipes 110 may be connected to the flushing waste liquid container 520, for example, the flushing drain ports 112 of at least two urea solution delivery pipes 110 are directly connected to the flushing waste liquid container 520 to receive the urea solution and urea crystals discharged from each urea solution delivery pipe 110. This structure is relatively simple and easy to implement.

[0055] Of course, the denitrification device may further include a first auxiliary pipe and a second auxiliary pipe. The urea solution inlets 111 of at least two urea solution delivery pipes 110 may be connected in parallel to the first auxiliary pipe and may both be connected to the first auxiliary pipe. The first auxiliary pipe may be connected to the urea solution container 510, so that the urea solution inlets 111 of at least two urea solution delivery pipes 110 may both be indirectly connected to the urea solution container 510 through the second auxiliary pipe. This structure may minimize the number of structures provided on the urea solution container 510 for connecting with the urea solution inlet 111 of the urea solution delivery pipe 110, thereby minimizing the reduction in the overall strength of the urea solution container 510.

[0056] The flushing drain ports 112 of at least two urea solution delivery pipes 110 can be connected in parallel to the second auxiliary pipe, and can both be connected to the second auxiliary pipe. The second auxiliary pipe can be connected to the flushing waste liquid container 520, so that the flushing drain ports 112 of at least two urea solution delivery pipes 110 can both be indirectly connected to the flushing waste liquid container 520 through the second auxiliary pipe. This structure can minimize the number of structures on the flushing waste liquid container 520 for connecting with the flushing drain ports 112 of the urea solution delivery pipes 110, thereby minimizing the reduction in the overall strength of the flushing waste liquid container 520.

[0057] Please continue to refer to Figure 3 The denitrification device may further include a connecting pipeline 130, which may be connected to the flushing waste liquid container 520 and the urea solution container 510 respectively. The connecting pipeline 130 may be provided with a third switch valve 330 for controlling the on-off of the connecting pipeline 130 (i.e., the connecting pipeline 130). The flushing waste liquid container 520 may be provided with a first heater 710, which may be used to heat the waste liquid in the flushing waste liquid container 520 to eliminate urea crystals in the waste liquid.

[0058] In a specific working process, after the urea crystals in the waste liquid in the flushing waste liquid container 520 are eliminated by the first heater 710, the third switch valve 330 can be opened to allow the waste liquid in the flushing waste liquid container 520 to flow to the urea solution container 510 through the connecting pipeline 130, thereby realizing the recycling of the waste liquid in the flushing waste liquid container 520, which is beneficial to reducing the loss of urea solution and further beneficial to saving urea solution.

[0059] It should be noted that the waste liquid in the flushing waste liquid container 520 may be a mixture of the urea solution and urea crystals discharged from each urea solution delivery pipe 110 .

[0060] In order to further improve the automation level of denitrification equipment, such as Figure 4 As shown, the third switch valve 330 can be a third electrically controlled valve, and the denitrification device can also include a detection device 600 and a controller 400. The controller 400 can be connected to the first heater 710, the detection device 600 and the third electrically controlled valve respectively. The detection device 600 can be arranged in the flushing waste liquid container 520 and can be used to detect the urea crystal content in the waste liquid.

[0061] Specifically, the detection device 600 can feed back the detected urea crystal content in the waste liquid to the controller 400. After receiving the urea crystal content in the waste liquid fed back by the detection device 600, the controller 400 can compare the urea crystal content in the waste liquid detected by the detection device 600 with a preset threshold value, so that when the urea crystal content is lower than the preset threshold value, the controller 400 can control the third electrically controlled valve to open, so that the waste liquid in the flushing waste liquid container 520 can flow to the urea solution container 510 through the connecting pipeline 130, thereby realizing the recycling of the waste liquid in the flushing waste liquid container 520.

[0062] In other embodiments, the third switch valve 330 may include an adjustment button, so that the third switch valve 330 can be opened or closed by manually driving the adjustment button. This structure is relatively simple and easy to implement.

[0063] Please refer to Figure 5 In a feasible technical solution, the denitrification device may further include a driving mechanism 800 and a stirring device 900. The driving mechanism 800 may be disposed outside the flushing waste liquid container 520 to avoid wasting the internal space of the flushing waste liquid container 520. The stirring device 900 may be disposed in the flushing waste liquid container 520 to facilitate the contact between the stirring device 900 and the waste liquid in the flushing waste liquid container 520, thereby facilitating improving the stirring effect.

[0064] The driving mechanism 800 can be connected to the stirring device 900. The driving mechanism 800 can be used to drive the stirring device 900 to stir the waste liquid during the heating process of the first heater 710, so that the temperature, concentration, etc. of the waste liquid can be made more uniform by stirring the waste liquid, thereby facilitating the dissolution of urea crystals in the waste liquid, which is beneficial to improving the dissolution efficiency of urea crystals in the waste liquid.

[0065] Optionally, the driving mechanism may include a manual driving portion, which may be a rotating operating handle, so that the stirring device 900 can be manually driven by rotating the operating handle. Of course, the driving mechanism may also include a motor, so that the stirring device 900 can be automatically driven by the motor. Specifically, the type of the motor may also be a stepping motor, a brushless DC motor, etc., which is not limited in the embodiments of the present application.

[0066] Please refer to Figure 6In the embodiment of the present application, the denitration device may further include a crystallized matter filtering component 1000. The crystallized matter filtering component 1000 may be disposed in the urea solution container 510, and may divide the inner cavity of the urea solution container 510 into a first cavity space 511 and a second cavity space 512. The first cavity space 511 may be located above the second cavity space 512. The connecting pipeline 130 may be directly connected to the first cavity space 511, and the urea solution inlet 111 may be directly connected to the second cavity space 512.

[0067] In this structure, the waste liquid heated by the first heater 710 can flow into the first cavity space 511 through the connecting pipe 130, and the crystallization filter component 1000 can filter the waste liquid in the first cavity space 511, so that the waste liquid in the first cavity space 511 flows into the second cavity space 512 after being filtered by the crystallization filter component 1000, so that urea crystals are filtered out by the crystallization filter component 1000, and the urea crystals are prevented from entering the second cavity space 512, thereby preventing the urea crystals from flowing from the second cavity space 512 into the urea solution inlet 111 and causing the urea solution delivery pipe 110 to be blocked, thereby helping to reduce the risk of blockage of the urea solution delivery pipe 110.

[0068] Please refer to Figure 7 In order to further improve the automation degree of the denitrification device, each urea solution delivery pipe 110 may be provided with a pipeline inner diameter detection unit 1100, the denitrification device may further include a controller 400, the first switch valve 310 may be a first electrically controlled valve, the controller 400 may be connected to the pipeline inner diameter detection unit 1100 and the first electrically controlled valve respectively, and may control the corresponding first electrically controlled valve to switch to a connected state when the actual inner diameter of the pipeline detected by the pipeline inner diameter detection unit 1100 is lower than the preset inner diameter.

[0069] Specifically, the pipeline inner diameter detection unit 1100 can feed back the actual inner diameter to the controller 400. After receiving the actual inner diameter, the controller 400 can compare the actual inner diameter with the preset inner diameter, so that when the actual inner diameter is lower than the preset inner diameter (which can be the actual inner diameter of the urea solution delivery pipe 110 when no urea crystals are deposited), the corresponding first electrically controlled valve can be controlled to switch to a connected state, so that the urea crystals in the corresponding urea solution delivery pipe 110 can be flushed by the urea solution and discharged from the urea solution delivery pipe 110 together with the urea solution. This structure can improve the degree of automation of the denitrification system, thereby helping to improve work efficiency.

[0070] Of course, in other embodiments, the first switch valve 310 may also include an adjustment button to control the first switch valve 310 to switch between the connected state and the disconnected state by manually driving the adjustment button. This structure is relatively simple and easy to implement.

[0071] Please refer to Figure 8 In order to reduce the risk of clogging of the urea solution spray gun 200, each urea solution spray gun 200 may be provided with a second heater 720. The second heater 720 may be used to heat the corresponding urea solution spray gun 200, thereby preventing the urea solution from precipitating urea crystals in the corresponding urea solution spray gun 200 and eliminating the urea crystals in the urea solution spray gun 200, thereby preventing the urea solution spray gun 200 from being clogged and affecting the normal operation of the urea solution spray gun 200.

[0072] Please continue to refer to Figure 8 In an embodiment of the present application, the circulating fluidized bed boiler may include a fluidizing fan 1200, the second heater 720 may be fixed on the corresponding urea solution spray gun 200, the second heater 720 may be provided with an over-wind heat exchange space, the over-wind heat exchange space may be connected to the air outlet of the fluidizing fan 1200, and the air transported by the fluidizing fan 1200 may be used to heat the urea solution spray gun 200 in the process of passing through the over-wind heat exchange space, so that the fluidizing fan 1200 can be fully utilized, avoiding the need for an additional heating source on the second heater 720, which is beneficial to reducing the loss of the circulating fluidized bed boiler.

[0073] The above embodiments of the present invention focus on the differences between the various embodiments. As long as the different optimization features of the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0074] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, all of which are within the protection of the utility model.

Claims

1. A denitration device for a circulating fluidized bed boiler, characterized in that: The invention comprises at least two urea solution delivery pipes (110) and at least two urea solution spray guns (200), wherein the at least two urea solution delivery pipes (110) are arranged in parallel, each of the urea solution delivery pipes (110) is provided with a urea solution inlet (111) and a flushing drain port (112), a spray gun connection port (113) is provided on the pipe wall of the urea solution delivery pipe (110) between the urea solution inlet (111) and the flushing drain port (112), the urea solution spray gun (200) is connected to the spray gun connection port (113), and the urea solution spray gun (200) is communicated with the urea solution inlet (111), and each of the urea solution delivery pipes (110) is provided with a first switch valve (310), and the first switch valve (310) is located between the spray gun connection port (113) and the flushing drain port (112); wherein, When the first switch valve (310) is in a connected state, the flushing drain port (112) is connected to the urea solution inlet (111); When the first switch valve (310) is in an off state, the flushing drain port (112) is isolated from the urea solution inlet (111), and the flushing drain port (112) is isolated from the urea solution spray gun (200).

2. The denitration device according to claim 1, characterized in that: The denitration device further comprises a flushing drainage main pipe (120), the flushing drainage ports (112) of the at least two urea solution delivery pipes (110) are both connected to the flushing drainage main pipe (120), and the flushing drainage main pipe (120) is provided with a second on-off valve (320) for controlling its on-off.

3. The denitration device according to claim 2, characterized in that: The second switch valve (320) is a second electrically controlled valve. The denitration device further comprises a controller (400). The controller (400) is electrically connected to the second electrically controlled valve, wherein: when the first switch valve (310) is in the connected state, the controller (400) controls the second electrically controlled valve to open at a preset opening frequency.

4. The denitration device according to claim 1, characterized in that: The denitration device further comprises a urea solution container (510) and a flushing waste liquid container (520); the urea solution inlets (111) of the at least two urea solution delivery pipes (110) are both in communication with the urea solution container (510); the flushing liquid outlets (112) of the at least two urea solution delivery pipes (110) are both in communication with the flushing waste liquid container (520); the denitration device further comprises a connecting pipe (130); the connecting pipe (130) is respectively in communication with the flushing waste liquid container (520) and the urea solution container (510); The connecting pipeline (130) is provided with a third switch valve (330) for controlling its on-off function. The flushing waste liquid container (520) is provided with a first heater (710). The first heater (710) is used to heat the waste liquid in the flushing waste liquid container (520) to eliminate urea crystals in the waste liquid.

5. The denitration device according to claim 4, characterized in that: The third switch valve (330) is a third electrically controlled valve. The denitration device further comprises a detection device (600) and a controller (400). The controller (400) is respectively connected to the first heater (710), the detection device (600), and the third electrically controlled valve. The detection device (600) is provided in the flushing waste liquid container (520) and is used to detect the urea crystal content in the waste liquid. When the urea crystal content is lower than a preset threshold, the controller (400) controls the third electrically controlled valve to open.

6. The denitration device according to claim 4, characterized in that: The denitrification device further comprises a driving mechanism (800) and a stirring device (900), wherein the driving mechanism (800) is arranged outside the flushing waste liquid container (520), and the stirring device (900) is arranged inside the flushing waste liquid container (520), and the driving mechanism (800) is connected to the stirring device (900), and the driving mechanism (800) is used to drive the stirring device (900) to stir the waste liquid during the heating process of the first heater (710).

7. The denitration device according to claim 4, characterized in that: The denitration device further comprises a crystallized matter filtering component (1000), wherein the crystallized matter filtering component (1000) is disposed in the urea solution container (510) and divides the inner cavity of the urea solution container (510) into a first inner cavity space (511) and a second inner cavity space (512), wherein the first inner cavity space (511) is located above the second inner cavity space (512); The connecting pipeline (130) is directly connected to the first cavity space (511), and the urea solution inlet (111) is directly connected to the second cavity space (512).

8. The denitration device according to claim 1, characterized in that: Each urea solution delivery pipe (110) is provided with a pipe inner diameter detection unit (1100); the denitration device further comprises a controller (400); the first switch valve (310) is a first electrically controlled valve; the controller (400) is respectively connected to the pipe inner diameter detection unit (1100) and the first electrically controlled valve; and when the actual inner diameter of the pipe detected by the pipe inner diameter detection unit (1100) is lower than a preset inner diameter, the controller controls the corresponding first electrically controlled valve to switch to the connected state.

9. The denitration device according to claim 1, characterized in that: Each of the urea solution spray guns (200) is provided with a second heater (720), and the second heater (720) is used to heat the corresponding urea solution spray gun (200).

10. The denitration device according to claim 9, characterized in that: The circulating fluidized bed boiler includes a fluidizing fan (1200), the second heater (720) is fixed on the corresponding urea solution spray gun (200), the second heater (720) is provided with an over-air heat exchange space, the over-air heat exchange space is connected to the air outlet of the fluidizing fan (1200), and the air transported by the fluidizing fan (1200) is used to heat the urea solution spray gun (200) in the process of passing through the over-air heat exchange space.

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