Novel low-temperature coal economizer for realizing deashing by steam heating

Abstract

The utility model discloses a novel low-temperature economizer utilizing steam heating to realize deashing, which relates to the technical field of environmental protection and energy conservation, and comprises a top steam-water heat exchanger, one side of the top steam-water heat exchanger is communicated with a water inlet header, and one side, far away from the top steam-water heat exchanger, of the water inlet header is communicated with a water inlet pipeline. The arc surface of the water inlet pipeline is fixedly connected with a flange plate, a plurality of flange holes are evenly formed in one side of the flange plate, the side, away from the water inlet collecting box, of the top steam-water heat exchanger communicates with a water outlet collecting box, and the side, away from the top steam-water heat exchanger, of the water outlet collecting box communicates with a water outlet pipeline. According to the novel low-temperature economizer capable of achieving deashing through steam heating, the effect that volatilization of ABS in the economizer can be promoted through steam heating is achieved, and the problems that after a finned tube heat exchange tube is abraded, ABS directly leaks into a flue to accumulate dust, and in the denitration process, ABS is extremely prone to being adhered to the interior of the economizer to cause blockage are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection and energy saving, in particular to a novel low-temperature economizer which realizes deashing by utilizing steam heating. Background Art

[0002] Low-temperature economizer is a device that can effectively save coal and improve boiler efficiency in the low-temperature section. It is mainly used in the medium and low-temperature sections of the air preheater outlet of large boilers in power plants, thermal power plants, etc. It can effectively reduce the exhaust gas thermal efficiency by recovering the flue gas waste heat to heat the boiler feed water. Low-temperature economizer is usually installed in the tail flue at the outlet of the boiler air preheater. It can not only improve the efficiency of electrostatic precipitator and meet low emission requirements, but also reduce power consumption and reduce the specifications of downstream equipment. At the same time, it can remove most of the acid gases.

[0003] The above-mentioned and existing related technologies often have the following defects: most low-temperature economizers use finned tubes. Since the heat medium water is directly introduced into the heat exchange tubes, after the heat exchange tubes are worn, the heat medium water will leak directly into the flue, resulting in serious ash accumulation, affecting the normal operation of the boiler smoke and air system, causing the boiler system to shut down, making the overall operation of the device unsafe, and there is escaped ammonia in the SCR denitrification process, which reacts with the incomplete combustion product SO3 to form ammonium bisulfate ABS. The melting point of ABS is 147°C and the boiling point is 350°C. It usually exists in solid and liquid forms in the flue gas. It has strong viscosity and adsorption, and is very easy to adhere to the low-temperature economizer, agglomerate fly ash, and cause blockage.

[0004] Therefore, we propose a new low-temperature economizer that uses steam heating to achieve deashing. Utility Model Content

[0005] The utility model aims to provide a novel low-temperature economizer which utilizes steam heating to achieve deashing, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a new type of low-temperature economizer that uses steam heating to achieve deashing, including a top steam-water heat exchanger, one side of the top steam-water heat exchanger is connected to a water inlet header, the side of the water inlet header away from the top steam-water heat exchanger is connected to a water inlet pipe, the arc surface of the water inlet pipe is fixedly connected to a flange, one side of the flange is evenly provided with a plurality of flange holes, the side of the top steam-water heat exchanger away from the water inlet header is connected to a water outlet header, the water outlet header is away from the top steam-water heat exchanger One side of the heat exchanger is connected with a water outlet pipe, the upper surface of the top steam-water heat exchanger is connected with a steam pressure relief valve, the upper surface of the top steam-water heat exchanger relative to one side of the steam pressure relief valve is connected with a pressure gauge, the lower surface of the top steam-water heat exchanger is connected with a water collecting tank, the lower surface of the water collecting tank is connected with a plurality of plate heat exchange fins, the lower surfaces of the plurality of plate heat exchange fins are connected with a bottom heat medium water tank, a steam pipe is installed in the bottom heat medium water tank, the lower surface of the water collecting tank is connected with a downcomer, and the downcomer is connected to the steam pipe.

[0007] The effect achieved by the above components is: steam heating can be used to promote the volatilization of ABS in the device, thereby minimizing the problem of ash accumulation in the flue due to direct leakage of the finned tube heat exchange tube after wear, and ABS is very easy to stick to the economizer during the destocking process, causing blockage.

[0008] Preferably, a plurality of the plate-type heat exchange fins are evenly connected to the upper surface of the bottom heat medium water tank.

[0009] The effect achieved by the above components is: by fixing the plate-type heat exchange fins at equal intervals, the plate-type heat exchange fins are prevented from being dust-accumulated or blocked.

[0010] Preferably, the inner wall of the flange hole is slidably connected with a clamping rod, one end of the clamping rod is fixedly connected with a screw rod, the arc surface of the screw rod is slidably connected with a sliding sleeve, the arc surface of the sliding sleeve is fixedly connected with a connecting block, the lower surface of the connecting block is fixedly connected with a support plate, and the support plate is located below the flange.

[0011] The effect achieved by the above components is that the connection plate slides from the arc surface of the support plate to the arc surface of the clamping rod, and the clamping rod achieves the effect of supporting the connection between the connection plate and the flange.

[0012] Preferably, the arc surface of the screw rod is threadedly connected with a screw sleeve, and one side of the screw sleeve abuts against the sliding sleeve.

[0013] The effects achieved by the above components are: the screw sleeve rotates from the arc surface of the screw rod to fit with the sliding sleeve, and the screw sleeve plays the role of temporarily limiting the sliding sleeve to prevent it from slipping.

[0014] Preferably, a support rod is fixedly connected to the arc surface of the support plate, and a long arm of the support rod is located at one side of the water inlet header.

[0015] The effect achieved by the above components is: the connecting disk presses the support plate to drive the support rod to support, and the support rod achieves the effect of supporting the support plate to reduce the compressive strength of the screw rod.

[0016] Preferably, the long arm of the support rod is fixedly connected with an expansion plate, and one side of the expansion plate abuts against the water inlet header.

[0017] The effects achieved by the above components are: the support rod drives the expansion plate to fit with the water inlet header, and the expansion plate plays a role in increasing the contact area of ​​the support rod.

[0018] Preferably, one end of the clamping rod away from the screw rod is fixedly connected to a cone head block, and the arc surface of the cone head block is slidably connected to the inner wall of the flange hole.

[0019] The effects achieved by the above components are: the clamp rod drives the cone head block to be inserted into the flange hole and the connection plate mounting hole, and the cone head block achieves the effect of guiding the clamp rod position.

[0020] Compared with the prior art, the beneficial effects of the utility model are: steam heating can be used to promote the volatilization of ABS in the device, the probability of system blockage and dust accumulation is reduced, and the blockage and dust accumulation phenomenon is effectively reduced, and the system operation stability is enhanced. The support method of the clamping rod and the support plate makes it more convenient for personnel to install the water inlet pipe, which is convenient for operation and reduces a certain labor intensity, thereby improving the work efficiency of personnel, and effectively solves the problem of ammonium bisulfate generated during the denitrification process adhering to the surface of the plate heat exchanger, and the fly ash in the flue gas is adsorbed and aggregated, causing the economizer to be blocked. The bottom heat medium water tank can heat the plate heat exchanger to the required heat, so that the ammonium bisulfate adhered to the plate heat exchanger will be vaporized and carried away by the flue gas, thereby realizing the removal of ammonium bisulfate. Compared with some electric heating, the advantage is that the steam comes from the power plant itself, and it can realize the effective reuse of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 It is a cross-sectional view of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the steam pipe of the utility model;

[0024] Figure 4 For this utility model Figure 1 Schematic diagram of the local structure;

[0025] Figure 5 It is a structural schematic diagram of the screw sleeve of the utility model.

[0026] In the figure: 1. water inlet pipe; 2. water inlet header; 3. water outlet pipe; 4. water outlet header; 5. top steam-water heat exchanger; 6. steam pressure relief valve; 7. pressure gauge; 8. water collecting tank; 9. plate heat exchanger; 10. bottom heat medium water tank; 11. steam pipe; 12. downcomer; 13. flange; 14. flange hole; 15. clamping rod; 16. screw; 17. sleeve; 18. connecting block; 19. support plate; 20. screw sleeve; 21. support rod; 22. expansion plate; 23. cone head block. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. 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.

[0028] See also Figure 1 and Figure 2 The utility model provides a technical solution: a new low-temperature economizer that uses steam heating to achieve deashing, including a top steam-water heat exchanger 5, one side of the top steam-water heat exchanger 5 is connected to an inlet header 2, the side of the inlet header 2 away from the top steam-water heat exchanger 5 is connected to an inlet pipe 1, the arc surface of the inlet pipe 1 is fixedly connected with a flange 13, one side of the flange 13 is evenly provided with a plurality of flange holes 14, the side of the top steam-water heat exchanger 5 away from the inlet header 2 is connected to an outlet header 4, the side of the outlet header 4 away from the top steam-water heat exchanger 5 is connected to an outlet pipe 3, the upper surface of the top steam-water heat exchanger 5 is connected to a steam pressure relief valve 6, and the upper surface of the top steam-water heat exchanger 5 A pressure gauge 7 is connected to the position on one side of the steam pressure relief valve 6, and a water collecting tank 8 is connected to the lower surface of the top steam-water heat exchanger 5. The lower surface of the water collecting tank 8 is connected to a plurality of plate heat exchange fins 9, and the lower surfaces of the plurality of plate heat exchange fins 9 are connected to a bottom heat medium water tank 10. A steam pipe 11 is installed in the bottom heat medium water tank 10, and a downcomer 12 is connected to the lower surface of the water collecting tank 8. The downcomer 12 is connected to the steam pipe 11, so that the effect of promoting the volatilization of ABS in the device by steam heating is achieved, thereby avoiding the direct leakage of the finned tube heat exchange tube into the flue and ash accumulation after wear, and the problem of ABS easily sticking to the economizer and causing blockage during the destocking process.

[0029] like Figure 2-Figure 5As shown, several plate heat exchanger sheets 9 are evenly connected to the upper surface of the bottom heat medium water tank 10, and the plate heat exchanger sheets 9 are fixed at equal intervals to avoid dust accumulation and blockage. The inner wall of the flange hole 14 is slidably connected with a clamping rod 15, and one end of the clamping rod 15 is fixedly connected with a screw 16. The arc surface of the screw 16 is slidably connected with a sliding sleeve 17, and the arc surface of the sliding sleeve 17 is fixedly connected with a connecting block 18. The lower surface of the connecting block 18 is fixedly connected with a support plate 19, and the support plate 19 is located below the flange 13. The connecting plate slides from the arc surface of the support plate 19 on the arc surface of the clamping rod 15, and the clamping rod 15 achieves the effect of supporting the connection between the connecting plate and the flange 13. The arc surface of the screw 16 is threadedly connected with a screw sleeve 20, one side of the screw sleeve 20 is in contact with the sliding sleeve 17, and the screw sleeve 20 rotates from the arc surface of the screw 16 to fit the sliding sleeve 17, and the screw sleeve 20 plays a role of temporarily limiting the sliding sleeve 17 to prevent it from slipping.

[0030] like Figure 4 and Figure 5 As shown, the arc surface of the support plate 19 is fixedly connected with a support rod 21, and the long arm of the support rod 21 is located at one side of the water inlet header 2. The connecting plate presses the support plate 19 to drive the support rod 21 to support it. The support rod 21 can achieve the effect of supporting the support plate 19 to reduce the compressive strength of the screw 16. The long arm of the support rod 21 is fixedly connected with an expansion plate 22, and one side of the expansion plate 22 is in contact with the water inlet header 2. The support rod 21 drives the expansion plate 22 to fit with the water inlet header 2, and the expansion plate 22 plays a role in increasing the contact area of ​​the support rod 21. The end of the clamping rod 15 away from the screw 16 is fixedly connected with a cone head block 23, and the arc surface of the cone head block 23 is slidably connected to the inner wall of the flange hole 14. The clamping rod 15 drives the cone head block 23 to be inserted into the flange hole 14 and the mounting hole of the connecting plate, and the cone head block 23 can achieve the effect of guiding the position of the clamping rod 15.

[0031] Working principle: when it is necessary to connect the flange 13 of the water inlet pipe 1, first drive the hammer block with the clamping rod 15 to insert into the flange hole 14, then slide the sleeve 17 to the arc surface of the screw 16, and the connecting block 18 drives the support plate 19 to move to the bottom of the flange 13 through the sleeve 17, and then slide the screw sleeve 20 from the arc surface of the screw 16 to fit with the sleeve 17. At this time, the sleeve 17 is horizontally limited, and then slide the connecting plate from the inner wall of the support plate 19. The connecting plate presses the support plate 19, and the support plate 19 drives the expansion plate 22 to fit with the water inlet header 2 with the help of the support rod 21. The expansion plate 22 plays a role in increasing the contact area of ​​the support rod 21. After the connecting plate is continuously moved, the connecting hole slides from the arc surface of the cone head block 23 to the arc surface of the clamping rod 15, and the cone head block 23 achieves the effect of guiding the position of the clamping rod 15. At this time The connecting plate is fitted with the flange 13, and then the other flange holes 14 are bolted to install the flange 13 and the connecting plate, and then the screw sleeve 20 is rotated to disengage from the screw rod 16. The screw sleeve 20 plays the role of temporarily limiting the sliding sleeve 17 to prevent slipping, and the moving clamping rod 15 drives the cone head block 23 to disengage from the inner wall of the flange hole 14. The clamping rod 15 achieves the effect of supporting the connection between the connecting plate and the flange 13, and then disengages from the inner wall of the connecting hole of the connecting plate, and the screw rod 16 is disengaged from the sliding sleeve 17 through the movement of the clamping rod 15, and finally moves out of the sliding sleeve 17. The connecting block 18 drives the support rod 21 and the expansion plate 22 to disengage from the water inlet header 2 through the sliding sleeve 17 with the help of the support plate 19. The support rod 21 achieves the effect of supporting the support plate 19 to reduce the compressive strength of the screw rod 16, thereby completing the connection of the flange 13 of the water inlet pipe 1.

[0032] The waste heat flue gas at the outlet of the air preheater passes through the wide flow channel heat exchange plate, and the waste heat is transferred to the heat exchange sheet. After the heat exchange in the top steam-water heat exchanger 5, the heat medium water becomes a steam-water mixture and rises until it becomes water vapor and enters the inclined plate of the water collecting tank 8. The water vapor condenses after heat exchange with the top heat exchanger, and the water vapor becomes condensed water droplets, which flow back to the upper end of the downcomer 12 through the inclined plate of the water collecting tank 8. The heat medium water in the water collecting tank 8 utilizes the density difference and flows back to the bottom heat medium water tank 10 through the gravity of the downcomer 12. The water in the bottom heat medium water tank 10 utilizes the density difference between the downcomer 12 and the plate heat exchange sheet 9, and at the same time utilizes the rising force of the bubbles in the plate heat exchange sheet 9 and the partial capillary condensation liquid film force to enter the plate heat exchange sheet 9 for heating. From then on, the heat medium water is formed. In one cycle, the boiler condensate is heated by the top steam-water heat exchanger 5 and then directly returns to the condensate outlet pipe. Since the boiler condensate pipe does not contact the flue gas, it only exchanges heat with the top water vapor, without leakage risk, and the boiler condensate can be zero-leaked. Finally, 200-300℃ steam from the power plant is introduced to heat the heat medium water in the bottom heat medium water tank 10. The heat medium water temperature rises and evaporates into water vapor. Since the system is completely closed, the evaporated water vapor pressurizes the entire sealed system, continuously increasing the boiling point of the heat medium water. The electric heating time and temperature are controlled according to the pressure gauge 7 index. If the pressure is too high, the pressure is released through the steam pressure relief valve 6. Then, the ABS is gradually converted into liquid, the viscosity is reduced, and it is blown away under the action of the flue gas, thereby achieving the cleaning of the ABS.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel low-temperature economizer for achieving deashing by steam heating, comprising a top steam-water heat exchanger (5), characterized in that: One side of the top steam-water heat exchanger (5) is connected to a water inlet header (2), and the side of the water inlet header (2) away from the top steam-water heat exchanger (5) is connected to a water inlet pipe (1), and the arc surface of the water inlet pipe (1) is fixedly connected to a flange (13), and one side of the flange (13) is evenly provided with a plurality of flange holes (14), and the side of the top steam-water heat exchanger (5) away from the water inlet header (2) is connected to a water outlet header (4), and the side of the water outlet header (4) away from the top steam-water heat exchanger (5) is connected to a water outlet pipe (3), and the upper surface of the top steam-water heat exchanger (5) is connected to There is a steam pressure relief valve (6); the upper surface of the top steam-water heat exchanger (5) is connected to a pressure gauge (7) at a position relative to one side of the steam pressure relief valve (6); the lower surface of the top steam-water heat exchanger (5) is connected to a water collecting tank (8); the lower surface of the water collecting tank (8) is connected to a plurality of plate-type heat exchange fins (9); the lower surfaces of the plurality of plate-type heat exchange fins (9) are connected to a bottom heat medium water tank (10); a steam pipe (11) is installed in the bottom heat medium water tank (10); the lower surface of the water collecting tank (8) is connected to a downcomer (12); and the downcomer (12) is connected to the steam pipe (11).

2. A novel low-temperature economizer for deashing by steam heating according to claim 1, characterized in that: A plurality of the plate-type heat exchange fins (9) are evenly connected to the upper surface of the bottom heat medium water tank (10).

3. A novel low-temperature economizer for deashing by steam heating according to claim 1, characterized in that: The inner wall of the flange hole (14) is slidably connected to a clamping rod (15), one end of the clamping rod (15) is fixedly connected to a screw rod (16), the arc surface of the screw rod (16) is slidably connected to a sliding sleeve (17), the arc surface of the sliding sleeve (17) is fixedly connected to a connecting block (18), the lower surface of the connecting block (18) is fixedly connected to a supporting plate (19), and the supporting plate (19) is located below the flange (13).

4. A novel low-temperature economizer for deashing by steam heating according to claim 3, characterized in that: The arc surface of the screw rod (16) is threadedly connected with a screw sleeve (20), and one side of the screw sleeve (20) is in contact with the sliding sleeve (17).

5. A novel low-temperature economizer for achieving deashing by steam heating according to claim 3, characterized in that: The arc surface of the support plate (19) is fixedly connected to a support rod (21), and the long arm of the support rod (21) is located on one side of the water inlet header (2).

6. A novel low-temperature economizer for deashing by steam heating according to claim 5, characterized in that: The long arm of the support rod (21) is fixedly connected to an expansion plate (22), and one side of the expansion plate (22) is in contact with the water inlet header (2).

7. A novel low-temperature economizer for deashing by steam heating according to claim 3, characterized in that: One end of the clamping rod (15) away from the screw rod (16) is fixedly connected to a cone head block (23), and the arc surface of the cone head block (23) is slidably connected to the inner wall of the flange hole (14).

Images