Zero-leakage vacuum heat pipe heat exchanger

Abstract

The utility model relates to the technical field of flue gas cooling, in particular to a zero-leakage vacuum heat pipe heat exchanger which comprises a heat exchange box, heat insulation section heat insulation plates are fixed to the centers of the inner walls of the two sides of the heat exchange box, and vacuum heat pipes are fixed to the upper side and the lower side of the outer wall of each heat insulation section heat insulation plate through holes. A cooling water cooling component is arranged on the outer wall of each vacuum heat pipe and located above a heat insulation plate of the heat insulation section, all the vacuum heat pipes are independent of one another, heat exchange media in the pipes are not communicated with one another, and the adjacent vacuum heat pipes do not leak one another; cooling water and flue gas are isolated from a heat insulation plate of the heat insulation section through a vacuum heat pipe to form a first isolation layer; cooling water circulates between the outer wall surface of the vacuum heat pipe and the inner wall surface of the sealing ring sleeve to form a second isolating layer; by means of the structure, double-layer isolation of condensate water and smoke can be achieved, and zero leakage of cooling water to the flue is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas cooling, in particular to a zero-leakage vacuum heat pipe heat exchanger. Background Art

[0002] The primary flue gas cooler was originally designed to be arranged in the horizontal flue between the air preheater outlet and the dust collector inlet. It was high in height (8m) and had a small inlet reducer. At the same time, the heat exchanger inlet and outlet flue had a large angle turn. The flue gas at the air preheater outlet immediately turned to enter the primary flue gas cooler after passing through the vertical flue, and the inlet flow field was poor. The local flue gas velocity of the heat exchanger was too fast, the fly ash scouring and wear accelerated, the tube wall was seriously thinned, and the number of heat exchange tube leakages increased. Group isolation measures had to be taken, and the heat exchange effect was seriously reduced.

[0003] In addition, after the heat exchange tube leaks during operation, the acidic substances in the flue gas react with water to form acid corrosion, accompanied by condensation of ammonium bisulfate and deposition of fly ash, causing fly ash blockage and severe acid corrosion of the heat exchange tube on the inlet side of the primary flue gas cooler. After the heat exchange tube wears and leaks, the leaked circulating water and the ash in the flue gas form sticky ash accumulation, so the existing flue gas cooler has certain shortcomings when in use.

[0004] In summary, it is necessary to invent a zero-leakage vacuum heat pipe heat exchanger. Utility Model Content

[0005] To this end, the utility model provides a zero-leakage vacuum heat pipe heat exchanger to solve the problem that the local flue gas velocity of the heat exchanger is too fast, the fly ash scouring and wear are accelerated, the tube wall is seriously thinned, the number of heat exchange tube leakage increases, and group isolation measures have to be taken, resulting in a serious decrease in heat exchange effect.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a zero-leakage vacuum heat pipe heat exchanger, comprising a heat exchange box, an insulation section insulation board is fixed at the center of the inner walls on both sides of the heat exchange box, vacuum heat pipes are fixed on the upper and lower sides of the outer walls of the insulation section insulation board through openings, and a cooling water cooling component is arranged on the outer wall of the vacuum heat pipe and above the insulation section insulation board.

[0007] Preferably, a filter box is fixed on the left side of the outer wall of the heat exchange box and below the insulation board of the insulation section, a stainless steel filter screen is installed on the left end of the upper and lower sides of the inner wall of the filter box, and a ceramic core filter layer is installed on the inner wall of the filter box and on the right side of the stainless steel filter screen.

[0008] Preferably, the upper and lower ends of the outer walls of the stainless steel filter screen and the ceramic core filter layer are slidably connected to the upper and lower sides of the inner wall of the filter box, and a take-in and put-out opening is opened at the front end of the outer wall of the filter box and at the corresponding position of the stainless steel filter screen and the ceramic core filter layer, and a sealing plate for sealing is fixed to the outside of the take-in and put-out opening.

[0009] Preferably, a smoke conveying pipe is connected to the inner wall of the filter box and the side away from the heat exchange box, and a smoke exhaust pipe is fixed to the right side of the inner wall of the heat exchange box and below the insulation board of the insulation section.

[0010] Preferably, the plurality of vacuum heat pipes are uniformly arranged in a strip array, and heat exchange medium is stored on the inner walls of the plurality of vacuum heat pipes.

[0011] Preferably, the cooling water cooling component includes sealing ring sleeves, the number of the sealing ring sleeves is the same as the number of the vacuum heat pipes, and the sealing ring sleeves are all wrapped around the outer wall of the vacuum heat pipe and located at the upper end of the insulation board of the insulation section.

[0012] Preferably, two adjacent sealing ring sleeves are connected via a short tube, the right bottom of the inner wall of the rightmost sealing ring sleeve is connected to a cooling water delivery pipe, and the left upper part of the inner wall of the leftmost sealing ring sleeve is connected to a cooling water discharge pipe.

[0013] The beneficial effects of the utility model are:

[0014] In the utility model, each vacuum heat pipe is independent of each other, the heat exchange medium in the pipe is not connected to each other, and adjacent vacuum heat pipes do not leak to each other; cooling water and flue gas are separated by the vacuum heat pipe and the insulation section insulation board, which is the first isolation layer; cooling water flows between the outer wall of the vacuum heat pipe and the inner wall of the sealing ring sleeve, which is the second isolation layer; this structure can achieve double-layer isolation of condensed water and flue gas, ensuring zero leakage of cooling water to the flue;

[0015] In the utility model, the original first-stage flue gas cooler is transformed by adopting zero-leakage vacuum heat pipe heat exchange technology to achieve long-term and stable low-resistance flue gas waste heat utilization, and eliminate the safety operation risks caused by cooling water leakage and flue ash blockage caused by the inevitable wear of the heat exchanger. At the same time, it can also achieve zero leakage operation of cooling water, improve the safety of the unit, improve the dust removal efficiency and desulfurization efficiency, reduce the slurry temperature of the absorption tower, realize waste heat recovery, and reduce the auxiliary steam consumption of flue gas deoxidation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the external structure of the utility model in the front view direction;

[0017] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model in the front view direction;

[0018] Figure 3 It is a schematic cross-sectional structure diagram of the filter box in the utility model in the front view direction;

[0019] Figure 4 It is a three-dimensional structural schematic diagram of the sealing ring sleeve in the utility model.

[0020] In the figure: 100, heat exchange box; 110, insulation section insulation board; 200, vacuum heat pipe; 210, heat exchange medium; 300, sealing ring sleeve; 310, cooling water delivery pipe; 320, cooling water discharge pipe; 400, filter box; 410, sealing plate; 420, stainless steel filter; 430, ceramic core filter layer; 440, flue gas delivery pipe; 450, flue gas discharge pipe. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0022] Refer to the attached Figure 1-4 The utility model provides a zero-leakage vacuum heat pipe heat exchanger, including a heat exchange box 100. The centers of the inner walls of both sides of the heat exchange box 100 are fixed with insulation sections and insulation boards 110. The insulation sections and insulation boards 110 are provided to seal and insulate to prevent heat transfer at the flue gas temperature. Vacuum heat pipes 200 are fixed through openings on the upper and lower sides of the outer walls of the insulation sections and insulation boards 110. Multiple vacuum heat pipes 200 are evenly arranged in a strip array. Heat exchange medium 210 is stored on the inner walls of the multiple vacuum heat pipes 200. The vacuum heat pipes 200 are divided into an evaporation section, an insulation section, and a condensation section. The heat is transferred by evaporation and condensation of the working fluid in the tube, and it has extremely high thermal conductivity, good isothermal properties, and the heat transfer area on both sides of the cold and hot sides can be changed arbitrarily, and heat transfer can be performed over a long distance, and the temperature can be controlled. Each vacuum heat pipe 200 is independent of each other, and the working fluids in the tube are not connected to each other. There is no leakage between adjacent vacuum heat pipes 200, and the set heat exchange medium 210 can evaporate by liquefaction and heat absorption, and then cool the flue gas. The evaporated heat exchange medium 210 will flow upward and release heat and condense at the upper end of the vacuum heat pipe 200. The condensed liquid heat exchange medium 210 can flow back to the vacuum heat pipe 200 for continued use;

[0023] The outer wall of the vacuum heat pipe 200 and the upper part of the insulation board 110 of the insulation section are provided with a cooling water cooling component, and the cooling water cooling component includes a sealing ring 300. The number of the sealing rings 300 is the same as the number of the vacuum heat pipes 200. The sealing rings 300 are all wrapped around the outer wall of the vacuum heat pipe 200 and are located at the upper end of the insulation board 110 of the insulation section. The two adjacent sealing rings 300 are connected by a short tube. The set sealing ring 300 can be wrapped around the outer wall of the vacuum heat pipe 200, and the gaseous heat exchange medium 210 at the upper end of the inner wall of the heat exchange medium 210 is cooled by the cooling water flowing inside. The right bottom of the inner wall of the rightmost sealing ring sleeve 300 is connected with a cooling water delivery pipe 310, and the left upper part of the inner wall of the leftmost sealing ring sleeve 300 is connected with a cooling water discharge pipe 320. The cooling water delivery pipe 310 is provided to deliver cooling water to the sealing ring sleeve 300, and the other end of the cooling water delivery pipe 310 can be connected to a water chiller device, so that the water chiller can deliver low-temperature cooling water to the sealing ring sleeve 300, and the other end of the cooling water discharge pipe 320 can deliver the cooling water after heat exchange back to the water chiller, so that the water chiller can cool the cooling water and reuse it;

[0024] A filter box 400 is fixed on the left side of the outer wall of the heat exchange box 100 and below the insulation board 110 of the insulation section. The filter box 400 is set to filter the high-temperature flue gas before heat exchange to prevent impurities in the flue gas from being adsorbed on the outer wall of the vacuum heat pipe 200 and to prevent excessive smoke and dust accumulation on the outer wall of the vacuum heat pipe 200 and affecting its heat exchange effect. A stainless steel filter screen 420 is installed on the left end of the upper and lower sides of the inner wall of the filter box 400, and a ceramic core filter layer 430 is installed on the inner wall of the filter box 400 and on the right side of the stainless steel filter screen 420. The upper and lower ends of the outer walls of the stainless steel filter screen 420 and the ceramic core filter layer 430 are slidably connected to the upper and lower sides of the inner wall of the filter box 400, and the stainless steel filter screen 420 and the ceramic core filter layer 430 are set to filter dust and impurities in the flue gas to a certain extent through two filtering steps. For filtration, a take-in / take-out port is provided at the front end of the outer wall of the filter box 400 and at the position corresponding to the stainless steel filter screen 420 and the ceramic core filter layer 430, and a sealing plate 410 for sealing is fixed on the outside of the take-in / take-out port. The take-in / take-out port is provided to take out, replace and clean the stainless steel filter screen 420 and the ceramic core filter layer 430 when the device is not in use, so as to ensure the filtering effect of the stainless steel filter screen 420 and the ceramic core filter layer 430. A flue gas conveying pipe 440 is connected to the inner wall of the filter box 400 and on the side away from the heat exchange box 100. A flue gas exhaust pipe 450 is fixed to the right side of the inner wall of the heat exchange box 100 and below the insulation board 110 of the insulation section. The flue gas conveying pipe 440 is provided to convey the flue gas to the filter box 400 for filtration, and the flue gas exhaust pipe 450 is provided to exhaust the flue gas after heat exchange.

[0025] The use process of the utility model is as follows: First, the personnel can transport the flue gas to be cooled to the filter box 400 through the flue gas delivery pipe 440, and the stainless steel filter 420 and the ceramic core filter layer 430 arranged inside the filter box 400 can filter the flue gas in two steps, and the filtered flue gas will enter the heat exchange box 100 through the through hole opened at the junction of the filter box 400 and the heat exchange box 100, and at the same time, the vacuum heat pipe 200 will filter the flue gas through the heat exchange medium 210, and the heat exchange medium 210 will filter the flue gas. After absorbing heat and evaporating, the heat medium 210 will float to the upper end of the vacuum heat pipe 200, and at the same time, the cooling water delivery pipe 310 can deliver the low-temperature water cooled by the water cooler to the sealing ring sleeve 300, and the sealing ring sleeve 300 will exchange heat with the heat exchange medium 210 through the cooling water, so that the heat exchange medium 210 can condense into liquid after releasing heat and remain at the bottom of the heat exchange medium 210, and the cooling water after heat exchange will be transported back to the water cooler through the cooling water discharge pipe 320 for repeated use.

[0026] The above is only a preferred embodiment of the utility model. Any person skilled in the art may modify the utility model by using the above technical solution or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent replacement based on the technical solution of the utility model shall fall within the scope of protection claimed by the utility model.

Claims

1. A zero-leakage vacuum heat pipe heat exchanger, comprising a heat exchange box (100), wherein insulation sections and heat insulation boards (110) are fixed at the center of the inner walls on both sides of the heat exchange box (100), characterized in that: The upper and lower sides of the outer wall of the heat-insulating section insulation board (110) are fixed with vacuum heat pipes (200) through openings, and the outer wall of the vacuum heat pipe (200) and above the heat-insulating section insulation board (110) are provided with cooling water cooling components.

2. A zero-leakage vacuum heat pipe heat exchanger according to claim 1, characterized in that: A filter box (400) is fixed on the left side of the outer wall of the heat exchange box (100) and located below the insulation section insulation board (110); a stainless steel filter screen (420) is installed on the left end of the upper and lower sides of the inner wall of the filter box (400); and a ceramic core filter layer (430) is installed on the inner wall of the filter box (400) and located on the right side of the stainless steel filter screen (420).

3. The zero-leakage vacuum heat pipe heat exchanger according to claim 2, characterized in that: The upper and lower ends of the outer walls of the stainless steel filter screen (420) and the ceramic core filter layer (430) are slidably connected to the upper and lower sides of the inner wall of the filter box (400), and a take-in and put-out opening is provided at the front end of the outer wall of the filter box (400) and at positions corresponding to the stainless steel filter screen (420) and the ceramic core filter layer (430), and a sealing plate (410) for sealing is fixed to the outer side of the take-in and put-out opening.

4. The zero-leakage vacuum heat pipe heat exchanger according to claim 3, characterized in that: A smoke conveying pipe (440) is connected to the inner wall of the filter box (400) and the side away from the heat exchange box (100), and a smoke exhaust pipe (450) is fixed to the right side of the inner wall of the heat exchange box (100) and below the insulation board (110) of the insulation section.

5. The zero-leakage vacuum heat pipe heat exchanger according to claim 1, characterized in that: The plurality of vacuum heat pipes (200) are uniformly arranged in a strip array, and the inner walls of the plurality of vacuum heat pipes (200) are filled with heat exchange medium (210).

6. The zero-leakage vacuum heat pipe heat exchanger according to claim 1, characterized in that: The cooling water temperature reduction component comprises a sealing ring sleeve (300), the number of the sealing ring sleeves (300) is the same as the number of the vacuum heat pipe (200), and the sealing ring sleeves (300) are all wrapped around the outer wall of the vacuum heat pipe (200) and located at the upper end of the insulation section insulation board (110).

7. The zero-leakage vacuum heat pipe heat exchanger according to claim 6, characterized in that: Two adjacent sealing ring sleeves (300) are connected via a short pipe; the bottom right side of the inner wall of the rightmost sealing ring sleeve (300) is connected to a cooling water delivery pipe (310); the top left side of the inner wall of the leftmost sealing ring sleeve (300) is connected to a cooling water discharge pipe (320).

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