Water circulation device beneficial to operation of boiler flue gas and air system and circulation method

Abstract

The invention relates to a water circulation device facilitating operation of a boiler flue gas and air system, the device comprises a cooling tower 2, a water pump set, the boiler flue gas and air system, a boiler body 25 and a water return pump assembly, one side of the cooling tower 2 is connected with the water pump set through a cooling tower water outlet door 3, and the other side of the cooling tower 2 is connected with the boiler flue gas and air system through the water return pump assembly; the boiler flue gas and air system is connected with the boiler body 25; according to the technical scheme, the novel device and method facilitating cooling water circulation of the boiler flue gas and air system are provided, water circulation of all unit equipment in the power plant boiler flue gas and air system is promoted to be smooth, fault monitoring is rapid and efficient, and the site is safe, clean and environmentally friendly.

Description

Technical Field

[0001] The invention relates to a circulation device, in particular to a water circulation device which is beneficial to the operation of a boiler smoke and air system, and belongs to the technical field of boiler smoke and air systems in power plants. Background Art

[0002] There are many equipments in various units of power plants that need to be cooled by water, including steam turbines, condensers, feed water pumps, internal water coolers, oil coolers, boiler blowers, induced draft fans, coal mills, powder dischargers, thin oil stations, air compressors, etc. If the cooling water circulation of these equipments is not smooth, or there is a failure in the water circulation, the cooling effect of the equipment will be reduced or even fail, which will affect the efficiency at the least, and damage the equipment or even shut down the equipment and stop production at the worst. Therefore, the cooling effect of the power plant unit equipment and the methods used to ensure and improve the cooling effect are crucial and urgently need to be invented.

[0003] After searching Chinese and foreign patents on the CNIPR Chinese Patent Database Service Platform, no related similar patents were found. The patent closest to this one, "Non-destructive rubber ball cage check valve, CN201720618304.3", is mainly used for the rubber ball in the check valve to quickly open and close the flow hole along the tilt angle of the ball cage; while this application is a new method that is beneficial to the water circulation of the boiler smoke and wind system, including: greatly reducing the loss of the rubber ball of the water pump check valve and reducing the maintenance frequency of the check valve; quickly determining which 6KV power supply line segment the damaged rubber ball is in; monitoring the oil content of the return water of the boiler smoke and wind system; the scheme method of the on-site layout of the water circulation and the function of generating electricity with the return water. Summary of the invention

[0004] The present invention is aimed at the problems existing in the prior art and provides a water circulation device that is beneficial to the operation of the boiler smoke and air system. The technical solution provides a new type of cooling water circulation device and method that is beneficial to the boiler smoke and air system. The technical solution promotes smooth water circulation of each unit equipment in the boiler smoke and air system of the power plant, fast and efficient fault monitoring, and safe, clean and environmentally friendly site.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a water circulation device that is beneficial to the operation of a boiler smoke and air system, characterized in that the device includes a cooling tower 2, a water pump group, a boiler smoke and air system, a boiler body 25 and a return water pump assembly, one side of the cooling tower 2 is connected to the water pump group through a cooling tower water outlet gate 3, and the other side is connected to the boiler smoke and air system through a return water pump assembly, and the boiler smoke and air system is connected to the boiler body 25.

[0006] As an improvement of the present invention, the water pump group includes, from top to bottom, a water pump inlet electric door 7, a water pump 6, a water pump check valve 5, a water pump outlet electric door 4 and a water pump outlet manual door 51.

[0007] As an improvement of the present invention, the boiler smoke and air system includes a blower A26, a blower B34, an induced draft fan C13 and an induced draft fan D23, wherein a water inlet gate A30, a water inlet filter A28 and a water inlet pressure measuring point A27 are installed on the cooling water inlet pipe of the blower A26, a water inlet gate B31, a water inlet filter B32 and a water inlet pressure measuring point B33 are installed on the cooling water inlet pipe of the blower B34; a water inlet front isolation door C18, a water inlet filter C17, a water inlet pressure measuring point C16 and a water inlet rear isolation door C18 are installed on the cooling water inlet pipe of the induced draft fan C13. Install the isolation door C15, install the front isolating door D19, the water inlet filter D20, the water inlet pressure measuring point D21 and the rear isolating door D22 on the cooling water inlet pipe of the induced draft fan D23, install the cooling return water oil content monitor A29 on the cooling return water pipe of the blower A26, and install the cooling return water oil content monitor B36 on the cooling return water pipe of the blower B34; install the cooling return water oil content monitor C14 on the cooling return water pipe of the induced draft fan C13, and install the cooling return water oil content monitor D12 on the cooling return water pipe of the induced draft fan D23.

[0008] As an improvement of the present invention, the cooling water return pipe of the blower and the cooling water return pipe of the induced draft fan are introduced into the upper part of the return water tank 43 with a filter screen, and the turbine 41 is arranged in the return water tank 43 below the cooling water return pipe, and is connected to the generator 39 outside the return water tank 43 as a whole. Figure 1 , Figure 2 The generator 39 is connected to the battery and the power supply line of the boiler smoke and air system to power the LED lighting 35 in the blower area, the LED lighting 11 in the induced draft fan area, and the camera 40 next to the return water tank 43. In addition, the power supply line is connected to the battery shed 48 in the area.

[0009] As an improvement of the present invention, the top of the water pump check valve 5 is a check valve inspection hole 52, and the middle of the water pump check valve 5 is provided with a rubber ball 54, which is respectively constrained in the corresponding ball cage 53. When the liquid flows back, the rubber ball 54 is pushed to the bottom of the ball cage 53, blocking the flow hole of the check valve 5, blocking the fluid and preventing backflow; when the liquid flows forward, the rubber ball 54 is pushed to the top area of ​​the ball cage 53, the flow hole is unobstructed, and the fluid maintains forward flow. Since the water pump 6 is supplied with water by a main pipe, the start and stop of the water pump 6 of this group and the start and stop of the water pump 6 of other adjacent groups will cause the rubber ball 54 and the ball cage 53 in the check valve 5 of this group of water pumps to collide continuously. Figure 4 That is, the rubber ball 54 collides with the cage outer frame 55 and the cage top frame 56. This collision will not only cause the cage outer frame 55 and the cage top frame 56 to deform, but also cause the rubber of the rubber ball 54 to be damaged and peeled off, and even the rubber ball 54 will break through the cage 53 fixed to the check valve 5, enter the water supply main pipe, and block the cooling water inlet of the boiler smoke and air system induced draft fan, causing the fan to shut down due to over-temperature.

[0010] As an improvement of the present invention, water oil content monitors are arranged at the return water tank, boiler blower and boiler induced draft fan cooling return water outlets. If the oil content is monitored in the return water tank or the cooling return water of the blower and induced draft fan, it can be determined that there is a leakage point in the oil-water heat exchange surface of the boiler blower and induced draft fan, thereby gaining time to avoid the expansion of the leakage point and prepare for maintenance work.

[0011] As an improvement of the present invention, a water turbine is arranged at the end of the return pipe of the supply and induced draft fan, above the return water tank. The water turbine drives the generator outside the return water tank, fully utilizing the potential energy of the cooling return water to generate hydroelectric power and store it in a battery to power the camera in the return water tank area and the LED lighting in the boiler supply fan area, the LED lighting in the boiler induced draft fan area, etc., to further improve energy utilization and reduce the factory power consumption of the boiler smoke and air system.

[0012] Compared with the prior art, the present invention has the following advantages: 1) This scheme does not make major changes to the water pump area, and cleverly changes the original soft-hard contact between the rubber ball and the ball cage in the water pump check valve to soft-soft contact, which greatly reduces the loss of the rubber ball and reduces the maintenance frequency of the check valve, reduces the frequency of electrical operation switching of the water pump, and improves the long-term stability of the water pump operation; 2) Compared with the traditional scheme, the rubber ball of this scheme is diversified in color, and is allocated and installed according to the 6KV high-voltage line corresponding to the water pump. Even if the rubber ball is damaged, the new method can be used to determine in which 6KV power supply line segment the rubber ball of the damaged check valve is located at the first time, and the maintenance is more targeted and efficient; 3) In this scheme, water oil content monitors are arranged at the return water tank, boiler blower, and boiler induced draft fan cooling return water outlet. If the oil content is detected, it can be quickly Find out the leakage point of the oil-water heat exchange surface, in order to avoid the leakage point from expanding, timely maintenance work preparation to gain time and avoid environmental oil pollution; 4) The return water pool set in the scheme provides an area for further precipitation of impurities in the cooling return water of the boiler smoke and wind system, and a filter is added at the outlet of the return water pool to further prevent debris from entering the water circulation system. The monitoring probe next to the return water pool and the remote control room enable the boiler operation duty officer to directly observe the situation of the boiler cooling return water pool and its outlet filter; 5) The scheme makes full use of the space in the return water pool, reasonably arranges the turbine, and cleverly uses the water energy of the return water of the boiler smoke and wind system's induced draft fan to rotate the turbine, drive the generator outside the return water pool to generate hydroelectric power and store it in the battery, powering the camera in the return water pool area and the LED lighting in the boiler induced draft fan area, further improving energy utilization and reducing the factory power consumption of the boiler smoke and wind system. 6) In this scheme, the smoke and air systems of the six boilers have a total of 24 forced draft fans. Even if some of the boiler fans are shut down for maintenance, it will not affect the above-mentioned hydropower generation, and power generation can be achieved 24 hours a day. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 : Flow chart of a new water circulation method that is beneficial to the operation of a boiler smoke and air system;

[0014] Figure 2 : Schematic diagram of boiler smoke and wind system hydropower generation;

[0015] Figure 3 : Schematic diagram of the internal structure of the water pump check valve;

[0016] Figure 4 : Schematic diagram of the location of the rubber ball and ball cage of the water pump check valve;

[0017] Figure 5 : Schematic diagram of the improved disassembly of the ball cage inside the water pump check valve in the new solution;

[0018] Figure 6 : Schematic diagram of the improved installation of the ball cage inside the water pump check valve in the new solution.

[0019] In the figure: 1 is the cooling tower water inlet gate; 2 is the cooling tower; 3 is the cooling tower water outlet gate; 4 is the water pump outlet electric gate; 5 is the water pump check valve; 6 is the water pump; 7 is the water pump inlet electric gate; 8 is the chimney; 9 is the boiler horizontal flue; 10 is the dust collector; 11 is the induced draft fan area lighting; 12 is the cooling return water oil content monitor D; 13 is the induced draft fan C; 14 is the cooling return water oil content monitor C; 15 is the isolation door after water inlet C; 16 is the water inlet pressure measuring point C; 17 is the water inlet filter C; 18 is the water inlet front isolation door C; 19 is the water inlet front isolation door D; 20 is the water inlet filter D; 21 is the water inlet pressure measuring point D; 22 is the water inlet rear isolation door D; 23 is the induced draft fan D; 24 is the air preheater; 25 is the boiler body; 26 is the forced draft fan A; 27 is the water inlet pressure measuring point A; 28 is the water inlet filter A; 29 is the cooling return water oil content monitoring Instrument A; 30 is the isolation door A before water inlet; 31 is the isolation door B before water inlet; 32 is the water inlet filter B; 33 is the water inlet pressure measuring point B; 34 is the fan B; 35 is the fan area lighting; 36 is the cooling return water oil content monitor B; 37 is the fan cooling return water pipe; 38 is the battery; 39 is the generator; 40 is the camera; 41 is the turbine; 42 is the cooling return water oil content monitor; 43 is the filter screen The return water pool; 44 is the cooling return water pipe of the induced draft fan; 45 is the main cooling water inlet door of the smoke and air system; 46 is the return water pump E; 47 is the return water pump F; 48 is the employee battery carport; 49 is the monitoring screen; 50 is the remote computer; 51 is the manual door of the water pump outlet; 52 is the check valve inspection hole; 53 is the check valve ball cage; 54 is the rubber ball; 55 is the ball cage outer frame; 56 is the ball cage top frame; 57 is the hose; 58 is the rubber ring. DETAILED DESCRIPTION

[0020] In order to deepen the understanding of the present invention, the present embodiment is described in detail below with reference to the accompanying drawings.

[0021] Example 1: See Figure 1 , a method for circulating cooling water in a boiler smoke and air system. In the scheme, each water pump group is composed of: a water pump inlet electric door 7, a water pump 6, a water pump check valve 5, a water pump outlet electric door 4, and a water pump outlet manual door 51. The cooling water from the cooling tower 2 is supplied to the boiler smoke and air system blower A26, blower B34, induced draft fan C13, induced draft fan D23 and other equipment for cooling the boiler smoke and air system fan during operation. Thereafter, the cooling return water is sent to the cooling tower 2 through the return water pump. The cooling water that has completed the cooling passes through the cooling tower outlet gate 3 to each water pump group and continues to be sent to the boiler smoke and air system fan, thereby completing the entire water circulation process. Unless all equipment is shut down for large-scale production, this process will be repeated to ensure 24-hour power generation and operation of the power plant. Figure 1 , install water inlet gate A30, water inlet filter A28, and water inlet pressure measuring point A27 on the cooling water inlet pipe of blower A26 (install water inlet gate B31, water inlet filter B32, and water inlet pressure measuring point B33 on the cooling water inlet pipe of blower B34); install front water inlet isolation door C18, water inlet filter C17, water inlet pressure measuring point C16, and rear water inlet isolation door C15 on the cooling water inlet pipe of induced draft fan C13 (install front water inlet isolation door D19, water inlet filter D20, water inlet pressure measuring point D21, and rear water inlet isolation door D22 on the cooling water inlet pipe of induced draft fan D23). Install cooling return water oil content monitor A29 on the cooling return water pipe of blower A26 (install cooling return water oil content monitor B36 on the cooling return water pipe of blower B34); install cooling return water oil content monitor C14 on the cooling return water pipe of induced draft fan C13 (install cooling return water oil content monitor D12 on the cooling return water pipe of induced draft fan D23). After the above steps are completed, the cooling return water pipes of the blower and induced draft fan are introduced into the upper part of the return water tank 43 with a filter. Below the cooling return water pipe, in the return water tank 43, a turbine 41 is arranged, which is connected to the generator 39 outside the return water tank 43 as a whole. Refer to Figure 1 , Figure 2 The generator 39 is connected to the battery and the power supply line of the boiler smoke and air system to power the LED lighting 35 in the blower area, the LED lighting 11 in the induced draft fan area, and the camera 40 next to the return water tank 43. In addition, the power supply line is connected to the battery shed 48 in the area.

[0022] Reference Figure 3It can be seen that the top of the original water pump check valve 5 is the check valve inspection hole 52, and there is a rubber ball 54 in the middle of the water pump check valve 5, which is respectively constrained in the corresponding ball cage 53. When the liquid flows back, the rubber ball 54 is pushed to the bottom of the ball cage 53, blocking the flow hole of the check valve 5, blocking the fluid and preventing backflow; when the liquid flows forward, the rubber ball 54 is pushed to the top area of ​​the ball cage 53, the flow hole is unobstructed, and the fluid maintains forward flow. Since the water pump 6 is supplied with water by the main pipe, the start and stop of the water pump 6 of this group and the start and stop of the water pump 6 of other adjacent groups will cause the rubber ball 54 and the ball cage 53 in the check valve 5 of this group of water pumps to collide continuously. Refer to Figure 4 That is, the rubber ball 54 collides with the cage outer frame 55 and the cage top frame 56. This collision will not only cause the cage outer frame 55 and the cage top frame 56 to deform, but also cause the rubber of the rubber ball 54 to be damaged and peeled off, and even the rubber ball 54 will break through the cage 53 fixed to the check valve 5, enter the water supply main pipe, and block the cooling water inlet of the boiler smoke and air system induced draft fan, causing the fan to shut down due to over-temperature.

[0023] Reference Figure 5 , Figure 6 After stopping the water pump 6, isolating the water and pulling the power, first remove the ball cage 53 from the water pump check valve 5 through the water pump check valve inspection hole 52, take out the rubber ball 54 together, and then disconnect the top frame 56 of the ball cage 53 from the outer frame 55, and then put the hoses 57 on the outer frame 55 one by one, and fix the rubber ring 58 on the inner side of the top frame 56 of the ball cage. After the above steps are completed, the outer frame 55 with the hose 57 and the top frame 56 of the ball cage with the rubber ring 58 installed are welded into a new whole, that is, the improved ball cage 53. In the described scheme, all water pumps 6 and their corresponding water pump inlet electric doors 7, water pump check valves 5, water pump outlet electric doors 4, and water pump outlet manual doors 51 are grouped together, and the power supply of every 2 groups is connected to a 6KV line. The 12 water pump groups total six sections, which are hereinafter referred to as: 6KV-I section, 6KV-II section, 6KV-III section, 6KV-IV section, 6KV-V section, and 6KV-VI section for distinction. Since the water pump group has determined different 6KV lines, we put a black rubber ball in the improved ball cage 53 of the water pump check valve of the 6KV-I section, a beige rubber ball in the water pump check valve ball cage 53 connected to the 6KV-II section, a red rubber ball in the water pump check valve ball cage 53 connected to the 6KV-III section, a blue rubber ball in the water pump check valve ball cage 53 connected to the 6KV-IV section, a white rubber ball in the water pump check valve ball cage 53 connected to the 6KV-V section, and a green rubber ball in the water pump check valve ball cage 53 connected to the 6KV-VI section. After the rubber ball 54 is placed, the ball cage 53 is closed and the check valve inspection hole 52 is closed.

[0024] Example 2: See Figure 1A water circulation method that is beneficial to the operation of a boiler smoke and air system, characterized in that the method comprises the following steps:

[0025] Step 1: According to the situation that the circulating water pumps in the factory are connected to different 6KV power supply lines, and each line supplies 2-3 water pumps, select rubber balls 54 of various colors to make them correspond to the power supply line segments one by one, so as to optimize and reduce the area range of potential failure of the water circulation of the boiler smoke and air system.

[0026] Step 2: The hose 57 of the ball cage 53 of the circulating water pump wraps the ball cage outer frame 55 and the ball cage top frame 56, so that the original soft-hard contact collision is changed into a soft-soft contact collision, which greatly reduces the loss of the rubber ball (54) and reduces the maintenance frequency of the water pump check valve (5) and the electrical operation switching frequency of the water pump 6, that is, significantly improves the water circulation stability of the boiler smoke and air system.

[0027] Step 3: When the rubber ball 54 is damaged, the outer shell of the damaged rubber ball is blocked along the pipeline to the water inlet filter A28 (B32) of the blower A26 (B34), causing the pressure of the water inlet pressure measuring point A (27) (B33) to drop. The boiler DCS system gives an alarm, and the operation and maintenance personnel go to the site to isolate the blower water inlet isolation door A (30) (B31), disassemble the water inlet filter A (28) (B32), and check the blocked debris. If the debris is black, it comes from the 6KV-I section water pump; if the debris is red, it comes from the 6KV-III section water pump; smaller particles of debris will settle at the bottom of the return water pool (43) along the return water pipe. After further confirmation, the water supply pump station can clearly know which 6KV line of the water pump rubber ball is damaged, so as to stop the pump accurately for maintenance as soon as possible, which shortens the water circulation failure time of the boiler smoke and air system.

[0028] Step 4: During the daily operation of the return water tank, boiler blower and induced draft fan, the cooling return water oil content monitor (42) is put into use, and the value is displayed on the DCS system of the remote computer (50). If the oil content is monitored, the remote computer (50) supplies power to the water body oil content monitors A (29), B (36), C (14), and D (12), and further monitors whether the oil content comes from the boiler blower A (26) / B (34) or the boiler induced draft fan C (13) / D (23), so as to quickly determine the source fan of the oil-water heat exchange surface leakage point, avoid the leakage point from continuing to expand, and gain time for maintenance work preparation, that is, avoid environmental oil pollution in the water circulation of the boiler smoke and air system.

[0029] Step 5: The return water pool (43) with filter screen provides an area for further precipitation of impurities in the cooling return water of the boiler flue gas system. The filter screen at the outlet further blocks impurities from entering the water circulation system. The monitoring probe (40) is remotely transmitted to the monitoring screen (49) in the control room to directly observe the conditions in the boiler cooling return water pool and the filter screen at its outlet, thereby reducing the aggravation of the blockage of impurities in the water circulation return of the boiler flue gas system and the hysteresis of the detection.

[0030] Step 6: The cooling return water of the induced draft fan is collected above the return water pool. The turbine (41) arranged in the return water pool below uses the water energy of the fan return water to drive the generator (39) outside the return water pool to generate hydroelectric power (the battery 38 is connected in parallel on the line) to supply power to the camera (40) in the return water pool area and the LED lighting in the boiler induced draft fan area and the battery carport (48) load. In this case, there are 6 boilers and a total of 24 induced draft fans in the smoke and air system. Even if some of the boiler fans are shut down for maintenance, it will not affect the hydroelectric power generation, that is, power generation 24 hours a day, further improving the energy utilization rate, that is, promoting the secondary utilization of the surplus energy of the boiler smoke and air system water cycle.

[0031] Step 7: In this case, the boiler flue gas system water circulation method starts from the water source, to the determination of the specific power supply line corresponding to the faulty water pump, the return water oil leakage environment monitoring, the return water debris judgment monitoring, and the secondary use of water energy, which improves and expands the comprehensive operation efficiency and effectiveness of the boiler flue gas system water circulation.

[0032] During the working process, the water circulation method that is beneficial to the operation of the boiler smoke and air system is as follows: during the start and stop process of the water pump 6, the rubber ball 54 in the water pump check valve 5 collides with the ball cage 53. Since the hose 57 wraps the ball cage outer frame 55 and the rubber ring 58 is fixed on the inner side of the ball cage top frame 56, the original soft-hard contact collision is cleverly changed to a soft-soft contact collision, which greatly reduces the loss of the rubber ball 54 (according to statistics, the damage of the rubber ball is reduced by more than 90%), while reducing the maintenance frequency of the water pump check valve 5 and the frequency of electrical operation switching of the water pump 6.

[0033] When the rubber ball 54 is damaged, the shell of the damaged rubber ball 54 is blocked along the pipeline to the water inlet filter A28 (B32) of the blower A26 (B34) of the boiler smoke and air system, causing the pressure of the water inlet pressure measuring point A27 (B33) to drop. The boiler DCS system gives an alarm, and the operation and maintenance personnel go to the site to isolate the front isolation door A30 (B31) of the blower water inlet, disassemble the water inlet filter A28 (B32), and check the blocked debris. If the fragments are found to be black, it can be determined that the rubber ball of the water pump check valve from the 6KV-I section is damaged; if the fragments are found to be red, it can be determined that the rubber ball of the water pump group check valve from the 6KV-III section is damaged; further, smaller particles of debris will settle at the bottom of the return pool 43 along the return pipe, which is convenient for further confirmation by the operation and maintenance. Once confirmed, it can be fed back to the water supply pump position to determine which 6KV line has the damaged rubber ball so that it can be repaired as soon as possible. Similarly, if the water inlet filter C17 (D20) of the induced draft fan C13 (D23) is blocked, the pressure of the water inlet pressure measuring point C16 (D21) will drop, the boiler DCS system will sound an alarm, and the operation and maintenance personnel will go to the site to isolate the operation. The rest of the steps are the same as above.

[0034] In the scheme, water body oil content monitors 42 (A29, B36, C14, D12) are arranged at the return water tank, boiler blower, and boiler induced draft fan cooling return water outlets. During daily operation, the cooling return water oil content monitor 42 is put into use, and the value is displayed on the DCS system of the remote computer 50. If the oil content is monitored, the remote computer 50 supplies power to the water body oil content monitors A29, B36, C14, and D12, and further monitors the oil content from the boiler blower A26 (B34) and the boiler induced draft fan C13 (D23). It can quickly find out which fan the leakage point of the oil-water heat exchange surface comes from, so as to avoid the expansion of the leakage point and timely prepare for maintenance operations to gain time and avoid environmental oil pollution. The return water tank 43 with filter in the scheme provides an area for further precipitation of impurities in the cooling return water of the boiler smoke and air system, and the filter at the outlet of the return water tank can further prevent debris from entering the water circulation system. The monitoring probe next to the return water tank and the large monitoring screen 49 in the remote control room enable the boiler operation operator to directly observe the conditions of the filter in the boiler cooling return water tank and its outlet.

[0035] The cooling return water of the forced draft fan will be collected in the return pipe above the return pool. The turbine 41 arranged in the return pool below it cleverly uses the water energy of the return water of the forced draft fan of the boiler smoke and wind system to rotate and drive the generator 39 outside the return pool to generate hydroelectric power (the battery 38 is connected in parallel on the line) to supply power to the loads such as the camera 40 in the return pool area, the LED lighting 11 (35) in the boiler forced draft fan area, and the battery carport 48. Since there are 6 boilers in the case, and the smoke and wind system has a total of 24 forced draft fans, even if some boiler fans are shut down for maintenance, it will not affect the above-mentioned hydroelectric power generation, thereby achieving 24-hour power generation, further improving energy utilization and reducing factory power consumption.

[0036] A novel cooling water circulation method is beneficial to the boiler smoke and air system. The cooling water circulation method provides new ideas and methods from the water source to the judgment of which high-voltage power line a faulty water supply pump corresponds to, oil leakage monitoring in return water, judgment and monitoring of return water debris, and secondary utilization of water energy.

[0037] The novel method for circulating cooling water in the boiler smoke and air system can effectively and significantly reduce the loss of the rubber ball in the water pump outlet check valve, and the loss rate can be reduced by more than 90%. The frequency of stopping the pump for maintenance to replace the check valve rubber ball is also reduced, which significantly improves the long-term stability of the water pump operation and reduces the electrical operation of the water pump switching.

[0038] The water pumps that supply water to the boiler smoke and air system are connected to different segments of the 6KV high-voltage line with every 2-3 water pumps, and the water pump check valves on each segment of the line use customized rubber balls of different colors, which are different from traditional single-color rubber balls.

[0039] Although the original main pipe-controlled cooling water supply is maintained in this solution, even if the rubber ball is damaged, through the new method of comprehensive judgment of the fan, induced draft fan cooling water inlet filter and pressure measuring point, return water tank, return water filter, and monitoring probe, it is still possible to immediately determine which 6KV power supply line segment has the water pump check valve with a damaged rubber ball, greatly narrowing the scope and avoiding shutdown for inspection and replacement of each unit, making the maintenance more targeted and efficient.

[0040] It should be noted that the above embodiments are not intended to limit the protection scope of the present invention. Equivalent changes or substitutions made on the basis of the above technical solutions fall within the protection scope of the claims of the present invention.

[0041] It should be noted that the above embodiments are not intended to limit the protection scope of the present invention, and equivalent changes or substitutions made on the basis of the above technical solutions all fall within the protection scope of the claims of the present invention.

Claims

1. A water circulation device that is beneficial to the operation of a boiler smoke and air system, characterized in that: The device includes a cooling tower, a water pump group, a boiler smoke and air system, a boiler body and a return pump assembly. One side of the cooling tower is connected to the water pump group through a cooling tower water outlet gate, and the other side is connected to the boiler smoke and air system through a return pump assembly. The boiler smoke and air system is connected to the boiler body.

2. The water circulation device for facilitating the operation of the boiler smoke and air system according to claim 1 is characterized in that: The water pump group comprises, from top to bottom, a water pump inlet electric door, a water pump, a water pump check valve, a water pump outlet electric door and a water pump outlet manual door.

3. The water circulation device for facilitating the operation of the boiler smoke and air system according to claim 2 is characterized in that: The boiler smoke and air system comprises a blower A (26), a blower B (34), an induced draft fan C (13) and an induced draft fan D (23), wherein a water inlet gate A (30), a water inlet filter A (28) and a water inlet pressure measuring point A (27) are installed on the cooling water inlet pipe of the blower A (26), a water inlet gate B (31), a water inlet filter B (32) and a water inlet pressure measuring point B (33) are installed on the cooling water inlet pipe of the blower B (34); a water inlet front isolation door C (18), a water inlet filter C (17), a water inlet pressure measuring point C (16) and a water inlet rear isolation door C ( 15), install a water inlet front isolation door D(19), a water inlet filter D(20), a water inlet pressure measuring point D(21), and a water inlet rear isolation door D(22) on the cooling water inlet pipe of the induced draft fan D(23); install a cooling return water oil content monitor A(29) on the cooling return water pipe of the forced draft fan A(26); install a cooling return water oil content monitor B(36) on the cooling return water pipe of the forced draft fan B(34); install a cooling return water oil content monitor C(14) on the cooling return water pipe of the induced draft fan C(13); install a cooling return water oil content monitor D(12) on the cooling return water pipe of the induced draft fan D(23).

4. The water circulation device for facilitating the operation of the boiler smoke and air system according to claim 3 is characterized in that: The cooling return water pipes of the blower and the induced draft fan are introduced into the upper part of the return water tank with a filter screen, and a water turbine is arranged in the return water tank below the cooling return water pipes and connected to the generator outside the return water tank as a whole.

5. The water circulation device for facilitating the operation of the boiler smoke and air system according to claim 3 or 4, characterized in that: The top of the water pump check valve is the check valve inspection hole, and there is a rubber ball in the middle of the water pump check valve, which is constrained in the corresponding ball cages. When the liquid flows back, the rubber ball is pushed to the bottom of the ball cage, blocking the flow hole of the check valve, blocking the fluid and preventing backflow; when the liquid flows forward, the rubber ball is pushed to the top area of ​​the ball cage, the flow hole is unobstructed, and the fluid maintains forward flow.

6. The water circulation device for facilitating the operation of the boiler smoke and air system according to claim 3 or 4, characterized in that: Water oil content monitors are installed at the return water tank, boiler blower and boiler induced draft fan cooling return water outlets. If oil content is detected in the return water tank or the cooling return water of the blower and induced draft fan, it can be determined that there is a leakage point on the oil-water heat exchange surface of the boiler blower and induced draft fan, which can buy time to avoid the expansion of the leakage point and prepare for maintenance work.

7. The water circulation device for facilitating the operation of the boiler smoke and air system according to claim 3 or 4, characterized in that: At the end of the return pipe of the supply and induced draft fan, above the return water tank, a water turbine is arranged. The water turbine drives the generator outside the return water tank, making full use of the potential energy of the cooling return water to generate hydroelectric power and store it in the battery to power the camera in the return water tank area and the LED lights in the boiler supply draft fan area and boiler induced draft fan area.

8. A water circulation method that is beneficial to the operation of a boiler smoke and air system, characterized in that: The method comprises the following steps: Step 1: According to the situation that the circulating water pumps in the factory are connected to different 6KV power supply lines, and each line supplies 2-3 water pumps, select rubber balls (54) of various colors to make them correspond to the power supply line segments one by one. Step 2: The hose 57 of the ball cage (53) of the circulating water pump wraps the outer frame (55) and the top frame (56) of the ball cage, so that the original soft-hard contact collision is changed into a soft-soft contact collision, which greatly reduces the loss of the rubber ball (54) and reduces the maintenance frequency of the water pump check valve (5) and the electrical operation switching frequency of the water pump (6), that is, significantly improves the water circulation stability of the boiler smoke and air system. Step 3: When the rubber ball (54) is damaged, the outer shell of the damaged rubber ball is blocked along the pipeline to the water inlet filter A (28) (B32) of the blower A26 (B34), causing the pressure of the water inlet pressure measuring point A (27) (B33) to drop. The boiler DCS system gives an alarm, and the operation and maintenance personnel go to the site to isolate the blower water inlet isolation door A (30) (B31), disassemble the water inlet filter A (28) (B32), and check the blocked debris. If the debris is black, it comes from the 6KV-I section water pump; if the debris is red, it comes from the 6KV-III section water pump; smaller particles of debris will settle at the bottom of the return water pool (43) along the return water pipe. After further confirmation, the water supply pump station can clearly know which 6KV line of the water pump rubber ball is damaged, so as to stop the pump accurately for maintenance as soon as possible, which shortens the water circulation failure time of the boiler smoke and air system. Step 4: During the daily operation of the return water tank, boiler blower and induced draft fan, the cooling return water oil content monitor (42) is put into use, and the value is displayed on the DCS system of the remote computer (50). If the oil content is monitored, the remote computer (50) supplies power to the water body oil content monitors A (29), B (36), C (14), and D (12), and further monitors whether the oil content comes from the boiler blower A (26) / B (34) or the boiler induced draft fan C (13) / D (23), so as to quickly determine the source fan of the oil-water heat exchange surface leakage point, avoid the leakage point from continuing to expand, and gain time for maintenance work preparation, that is, avoid environmental oil pollution in the water circulation of the boiler smoke and air system. Step 5: The return water pool (43) with filter screen provides an area for further precipitation of impurities in the cooling return water of the boiler flue gas system. The filter screen at the outlet further blocks impurities from entering the water circulation system. The monitoring probe (40) is remotely transmitted to the monitoring screen (49) in the control room to directly observe the conditions in the boiler cooling return water pool and the filter screen at its outlet, thereby reducing the aggravation of the blockage of impurities in the water circulation return of the boiler flue gas system and the hysteresis of the detection. Step 6: The cooling return water of the induced draft fan is collected above the return water pool, and the turbine (41) arranged in the return water pool below uses the water energy of the fan return water to drive the generator (39) outside the return water pool to generate hydroelectric power (the battery 38 is connected in parallel on the line), and supplies power to the camera (40) in the return water pool area, the LED lighting in the boiler induced draft fan area, and the battery carport (48) load; Step 7: The boiler smoke and air system water circulation method starts from the water source, to the judgment of the specific power supply line corresponding to the faulty water pump, return water oil leakage environmental monitoring, return water debris judgment monitoring, and secondary utilization of water energy, thereby improving and expanding the comprehensive operation efficiency and effectiveness of the boiler smoke and air system water circulation.

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