Phenolic resin graphite pipe type smoke-water heat exchanger and production method and application thereof

Abstract

The invention relates to the technical field of heat exchange equipment, and particularly discloses a phenolic resin graphite pipe type smoke-water heat exchanger and a production method and application thereof.The phenolic resin graphite pipe type smoke-water heat exchanger comprises a shell, a smoke inlet and a smoke outlet are formed in the two ends of the shell respectively, and an upper module and a lower module are sequentially arranged in the middle of the shell from top to bottom; a first tube box and a second tube box are arranged at the two ends of the upper module and the two ends of the lower module respectively, tube plates are fixedly arranged on the opposite sides of the first tube box and the second tube box respectively, a plurality of heat exchange tubes are arranged between the two tube plates in the upper module and between the two tube plates in the lower module respectively, and the two ends of each heat exchange tube are communicated with the first tube box and the second tube box. The first tube box is divided into an inlet box and an outlet box, a cold side inlet is formed in the lower portion of the outer wall of the first tube box, and a cold side outlet is formed in the upper portion of the outer wall of the first tube box. The heat exchange performance of the phenolic resin graphite pipe type smoke-water heat exchanger can be effectively improved, and the maintenance cost of the phenolic resin graphite pipe type smoke-water heat exchanger in the using process is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange equipment, and specifically discloses a phenolic resin graphite tube type smoke-water heat exchanger and a production method and application thereof. Background Art

[0002] As a waste heat recovery device, the flue gas-water heat exchanger is widely used in many industrial fields. Its working principle is to utilize the heat of high-temperature or medium-temperature flue gas generated by industrial kilns, boilers, coke ovens, etc. to exchange heat with water and recover its heat. At present, the heat exchange tubes of the flue gas-water heat exchanger are mostly made of enameled tubes, which have the functions of insulation, protection of the metal matrix, and prevention of corrosion and oxidation of the metal matrix. Because the enamel coating on the outer surface of the enameled tube has the advantages of superior corrosion resistance, high hardness, strong oxidation resistance and low price, it is widely used in air preheaters, but it may also fail after long-term use.

[0003] The large-diameter bubbles in the coating will reduce the effective thickness of the coating. The tip of the bubble is a stress concentration point and the source of cracks. The cracks expand under the action of temperature and stress, causing the coating to crack and fall off. The high temperature during the welding process will cause certain damage to the coating, resulting in uneven distribution of elements at the weld, making it difficult to form a dense coating, which in turn easily leads to the corrosive medium corroding the metal substrate through the area with insufficient thickness. The enamel coating and the metal substrate are two materials with very different physical properties, and their thermal expansion coefficients are very different. Under the action of thermal deformation of the metal substrate, the enamel coating is easily cracked. The thickness of the enameled tube is uneven, and corrosion preferentially occurs in areas where the enamel coating is thinner and in areas where alkali metals are concentrated in the coating. Alkali metals easily react with acids and dissolve in the solution, resulting in loose and porous SiO2 remaining in the enamel coating, which in turn causes the coating to fail. Summary of the invention

[0004] In view of the above deficiencies in the prior art, the present invention provides a phenolic resin graphite tube type smoke-water heat exchanger to solve the problem in the prior art that the smoke-water heat exchanger is easily damaged during use, thereby affecting the overall performance and service life of the heat exchanger, thereby making up for the deficiencies of the existing smoke-water heat exchanger in performance and manufacturing process; the present invention also provides a production method and application.

[0005] The technical solution adopted by the present invention to solve its technical problem is: The phenolic resin graphite tube type smoke-water heat exchanger comprises a shell, and two ends of the shell are respectively provided with a smoke inlet and a smoke outlet, and the middle part of the shell is sequentially penetrated by an upper module and a lower module from top to bottom, and both ends of the upper module and the lower module are respectively provided with a tube box one and a tube box two, and opposite sides of the tube box one and the tube box two are fixedly provided with tube sheets, and a plurality of heat exchange tubes are penetrated between the two tube sheets in the upper module and between the two tube sheets in the lower module, and the two ends of the heat exchange tubes are respectively connected to the tube box one and the tube box two, and the inner cavity of the tube box one is divided into an inlet box and an outlet box by a partition, and the lower part of the outer wall of the tube box one cooperates with the inlet box to open a cold side inlet, and the upper part of the outer wall of the tube box one cooperates with the outlet box to open a cold side outlet.

[0006] Furthermore, flushing ports are provided on the upper and lower parts of the side wall of the shell near the cold side outlet, a number of sewage outlets are spaced apart on one side of the bottom end of the shell, two inspection ports are provided on the lower part of the side wall of the shell near the pipe box one, and the two inspection ports are respectively arranged on both sides of the lower pipe box one, a temperature measuring port one and a pressure measuring port one are provided in sequence on the side wall of the shell near the flue gas inlet, a temperature measuring port two and a pressure measuring port two are provided in sequence on the side wall of the shell near the flue gas outlet, and lifting frames are fixedly provided at both ends of the top end of the shell.

[0007] Furthermore, a plurality of tube holes are provided on the tube sheet in cooperation with the inlet box and the outlet box, sealing grooves are provided on the inner walls of the tube holes, O-rings are fixedly provided in the sealing grooves, the heat exchange tubes are provided in the tube holes through the O-rings, and a plurality of support plates are fixedly provided on the heat exchange tubes.

[0008] Furthermore, the support plate is made of thermosetting resin and glass fiber, and the heat exchange tube is made of phenolic resin graphite tube, which is a thermosetting polymer phenolic resin and graphite formed by extrusion. The outer surfaces of several heat exchange tubes close to the flue gas inlet side are fixedly covered with anti-wear tiles.

[0009] Furthermore, cover plates are fixedly provided at the upper and lower ends of the shell and on the opposite sides of pipe box 1 and pipe box 2. The shell includes a steel structure frame in the middle and flue gas side reducers located on both sides of the steel structure frame. Pipe box 1 and pipe box 2 are fixedly connected to the two ends of the steel structure frame respectively.

[0010] Furthermore, the production method of the phenolic resin graphite tube type smoke-water heat exchanger comprises the following steps: S1. Fix the pipe box 1, pipe box 2 and the cover plates on the opposite sides between the pipe box 1 and the pipe box 2 by riveting and welding. After riveting and welding, perform nondestructive testing on the welds of the pipe box 1, pipe box 2 and the cover plates on the opposite sides between the pipe box 1 and the pipe box 2. Then, assemble the steel structure frame and the flue gas side reducer by riveting and welding to obtain the shell; S2. Process the sealing grooves in the several tube holes on the tube sheet, and then process the sealing surfaces of the cover plates on the opposite sides of the tube box 1, the tube box 2, and the tube box 1 and the tube box 2; assemble and weld the tube box 1, the tube box 2 and the steel structure frame, perform anti-corrosion treatment on the flue gas side steel structure frame, and install the support plate on the steel structure frame; S3. Install O-rings and heat exchange tubes in the sealing grooves of the tube sheets on both sides. After installation, perform an overall water pressure test. After verification, perform modular assembly to obtain a phenolic resin graphite tube type smoke-water heat exchanger.

[0011] Furthermore, in step S1, a positioning tube should be placed in advance before assembly, and an outer insulation layer is fixedly provided on the outer wall of the shell by welding outer insulation anchor nails, and the thickness of the outer insulation layer is 80-120 mm.

[0012] Furthermore, in step S2, the flatness of the tube sheet surface is 0.1-0.15% of the total length, the coaxiality of the tube hole is less than Φ0.5mm, and adjacent support plates are interconnected; the positioning tube is removed after assembly and welding, and the anti-corrosion treatment is to apply anti-corrosion paint or glass flakes.

[0013] Furthermore, in step S3, the compression amount of the O-ring is between 15% and 25%. After the heat exchange tubes are installed, the cover plates on the back sides of the tube boxes 1 and 2 are installed, and the sealing surfaces of the cover plates on the back sides of the tube boxes 1 and 2 and the tube boxes 1 and 2 are sealed with concave-convex grooves.

[0014] The application of the phenolic resin graphite tube type smoke-water heat exchanger is applied to a flue gas waste heat recovery system. The flue gas waste heat recovery system includes a phenolic resin graphite tube type smoke-water heat exchanger. The smoke outlet of the phenolic resin graphite tube type smoke-water heat exchanger is fixedly connected to a desulfurization tower through a flue gas pipeline one, and the smoke inlet of the phenolic resin graphite tube type smoke-water heat exchanger is fixedly connected to an induced draft fan through a flue gas pipeline two. The end of the induced draft fan away from the flue gas pipeline two is fixedly connected to a dust collector. A bracket is fixedly provided at the bottom end of the phenolic resin graphite tube type smoke-water heat exchanger, and a platform one is fixedly provided at the top of the bracket. The phenolic resin graphite tube type smoke-water heat exchanger is fixedly connected to the platform one, and a climbing ladder is fixedly provided on the side wall of the bracket away from the desulfurization tower. A platform two is fixedly provided at the top of the phenolic resin graphite tube type smoke-water heat exchanger, and the platform two is provided between two lifting frames.

[0015] The beneficial effects of the present invention are: 1. The present invention can effectively improve the heat exchange performance of the phenolic resin graphite tube type smoke-water heat exchanger by adopting the phenolic resin graphite tube type smoke-water heat exchanger; the sealing method of the sealing groove in the tube hole combined with the O-ring makes the pressure bearing capacity and corrosion resistance of the phenolic resin graphite tube type smoke-water heat exchanger in the smoke-water heat exchange to be well balanced, and effectively improves the thermal conductivity and corrosion resistance of the phenolic resin graphite tube type smoke-water heat exchanger; the manufactured phenolic resin graphite tube type smoke-water heat exchanger has a wider application field and can better meet the use requirements under various special conditions.

[0016] 2. The inner cavity of the pipe box one of the present invention is divided into an inlet box and an outlet box by a partition. The circulating water enters the heat exchange tubes of the upper module and the lower module through the inlet box via the cold side inlet, enters the pipe box two after heat exchange in the phenolic resin graphite tube type smoke-water heat exchanger, and then enters the heat exchange tubes on the other side of the upper module and the lower module, flows back to the pipe box one after secondary heat exchange in the phenolic resin graphite tube type smoke-water heat exchanger, and is discharged from the phenolic resin graphite tube type smoke-water heat exchanger through the cold side outlet. The circulating water participates in multiple heat exchanges in the phenolic resin graphite tube type smoke-water heat exchanger, fully absorbs the waste heat of the flue gas, improves the heat exchange efficiency of the phenolic resin graphite tube type smoke-water heat exchanger, and saves energy consumption. The present invention realizes the individual cutting out and maintenance of the modules through modular installation and installation of covers at the pipe box one and the pipe box two; by using O-rings to seal between the heat exchange tubes and the tube holes, the heat exchange tubes can be directly replaced on site or sealed with plugs, which greatly reduces the maintenance cost of the phenolic resin graphite tube type smoke-water heat exchanger during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view structural schematic diagram of the flue gas waste heat recovery system of the present invention; Figure 2 It is a schematic diagram of the top view of the structure of the flue gas waste heat recovery system of the present invention; Figure 3 It is a front view structural schematic diagram of the phenolic resin graphite tube type smoke-water heat exchanger of the present invention; Figure 4 It is a side view structural schematic diagram of the phenolic resin graphite tube type smoke-water heat exchanger of the present invention; Figure 5 It is a schematic diagram of the top view of the structure of the phenolic resin graphite tube type smoke-water heat exchanger of the present invention; Figure 6 It is a structural cross-sectional view of the phenolic resin graphite tube type smoke-water heat exchanger of the present invention; Figure 7 It is a structural schematic diagram of the tube sheet of the present invention; Figure 8 It is a schematic diagram of the structure of the anti-wear tile of the present invention; In the figure: 1. desulfurization tower; 2. flue gas pipeline 1; 3. phenolic resin graphite tubular flue gas water heat exchanger; 301. shell; 302. flue gas inlet; 303. flue gas outlet; 304. heat exchange tube; 305. tube sheet; 306. tube box 1; 307. tube box 2; 308. cold side inlet; 309. cold side outlet; 310. flushing port; 311. sewage outlet; 312. maintenance port; 313. temperature measuring port 1; 314. temperature measuring port 2; 315. pressure measuring port 1; 316. pressure measuring port 2; 317. upper module; 318. lower module; 319. lifting frame; 320. pipe hole; 321. support plate; 322. anti-wear tile; 4. flue gas pipeline 2; 5. induced draft fan; 6. bracket; 7. platform 1; 8. climbing ladder; 9. platform 2. DETAILED DESCRIPTION

[0018] The present invention will be described and illustrated in detail below in conjunction with the accompanying drawings.

[0019] Example 1 like Figure 1-8 As shown, the phenolic resin graphite tube type smoke water heat exchanger 3 includes a shell 301, and the two ends of the shell 301 are respectively provided with a smoke inlet 302 and a smoke outlet 303. The middle part of the shell 301 is sequentially penetrated by an upper module 317 and a lower module 318 from top to bottom. The two ends of the upper module 317 and the lower module 318 are respectively provided with a tube box 1 306 and a tube box 2 307. The opposite sides of the tube box 1 306 and the tube box 2 307 are fixedly provided with a tube sheet 305. A plurality of heat exchange tubes 304 are provided between the two tube sheets 305 in the module 317 and between the two tube sheets 305 in the lower module 318. The two ends of the heat exchange tubes 304 are respectively connected to tube box 1 306 and tube box 2 307. The inner cavity of tube box 1 306 is divided into an inlet box and an outlet box by a partition. A cold side inlet 308 is provided at the lower part of the outer wall of tube box 1 306 in coordination with the inlet box, and a cold side outlet 309 is provided at the upper part of the outer wall of tube box 1 306 in coordination with the outlet box.

[0020] The inner cavity of the pipe box 1 306 is divided into an inlet box and an outlet box by a partition. The circulating water enters the heat exchange tubes 304 of the upper module 317 and the lower module 318 through the cold side inlet 308 and the inlet box, and enters the pipe box 2 307 after heat exchange in the heat exchange tube 304, and then enters the heat exchange tube 304 on the other side of the upper module 317 and the lower module 318. After secondary heat exchange in the heat exchange tube 304, it flows back to the pipe box 1 306 and is discharged through the cold side outlet 309. Resin graphite tube type smoke-water heat exchanger 3, during this process, high-temperature smoke always enters into phenolic resin graphite tube type smoke-water heat exchanger 3 through smoke inlet 302, and is discharged from phenolic resin graphite tube type smoke-water heat exchanger 3 through smoke outlet 303 after participating in heat exchange, and circulating water exchanges heat with high-temperature smoke for multiple times in phenolic resin graphite tube type smoke-water heat exchanger 3, fully absorbing waste heat of smoke, improving heat exchange efficiency of phenolic resin graphite tube type smoke-water heat exchanger 3, and saving energy consumption.

[0021] Flushing ports 310 are provided on the upper and lower parts of the side wall of the shell 301 near the cold side outlet 309, a plurality of sewage outlets 311 are provided at intervals on one side of the bottom end of the shell 301, two inspection ports 312 are provided on the lower part of the side wall of the shell 301 near the pipe box 1 306, and the two inspection ports 312 are respectively arranged on both sides of the lower pipe box 1 306, a temperature measuring port 1 313 and a pressure measuring port 1 315 are provided in sequence on the side wall of the shell 301 near the flue gas inlet 302, a temperature measuring port 2 314 and a pressure measuring port 2 316 are provided in sequence on the side wall of the shell 301 near the flue gas outlet 303, and hanging frames 319 are fixedly provided at both ends of the top of the shell 301.

[0022] A plurality of tube holes 320 are provided on the tube sheet 305 in cooperation with the inlet box and the outlet box, and sealing grooves are provided on the inner walls of the tube holes 320, and O-type sealing rings are provided in the sealing grooves, and the heat exchange tubes 304 are provided in the tube holes 320 through the O-type sealing rings, and a plurality of support plates 321 are provided at intervals on the heat exchange tubes 304. The provision of a plurality of support plates 321 can prevent the heat exchange tubes 304 from having Karman vortex streets, thereby causing resonance on site, and ensure the stable operation of the device.

[0023] O-rings are made of various types of rubber and can meet almost all kinds of anti-corrosion requirements in the industry. By utilizing the compressibility of the O-ring, the O-ring is installed in the sealing groove of the tube hole 320 on the tube sheet 305, and then the heat exchange tube 304 is chamfered and directly inserted into the O-ring. The compression amount of the O-ring is reasonably designed according to the needs so that it can achieve a sealing form with a maximum pressure resistance of 1.6MPa.

[0024] The support plate 321 is made of thermosetting resin and glass fiber, and the heat exchange tube 304 is made of phenolic resin graphite tube, which is a thermosetting polymer phenolic resin and graphite formed by extrusion. The outer surfaces of several heat exchange tubes 304 near the flue gas inlet 302 are fixedly covered with anti-wear tiles 322.

[0025] Graphite itself has excellent thermal conductivity, which can easily achieve heat exchange under low heat exchange temperature difference conditions, and can also meet the deep heat exchange requirements of important occasions such as waste heat recovery and gas condensation, greatly improving energy utilization efficiency; the combination of phenolic resin and graphite gives the heat exchange tube 304 excellent corrosion resistance. When subjected to corrosion by various acids, salts, chloride ions and other chemical substances, the phenolic resin graphite tube can always remain stable, greatly meeting the heat exchange requirements of working media such as hydrochloric acid, phosphoric acid, and sulfuric acid, and at the same time meeting the high-intensity dew point corrosion conditions of various sulfur-containing, chlorine-containing and other flue gases; the heat exchange tube 304 is formed in one piece by high-pressure extrusion, so that The heat exchange tube 304 has high strength and hardness, can withstand strong pressure and external force impact, and is not easy to deform or damage, so as to ensure stability and reliability during use; the graphite on the surface of the heat exchange tube 304 is smooth and not easy to scale, and can reduce the flow resistance of the fluid in the heat exchange tube 304, thereby reducing energy loss, and also reducing the wear on the inner wall of the heat exchange tube 304, further extending the service life of the heat exchange tube 304; by fixing the anti-wear shoe 322 on the outer surface of the heat exchange tube 304 on the side of the flue gas inlet 302, the wear on the heat exchange tube 304 can be reduced when the content of particulate matter in the flue gas is high.

[0026] Cover plates are fixedly provided at the upper and lower ends of the shell 301 and the opposite sides of the pipe box 1 306 and the pipe box 2 307. The shell 301 includes a steel structure frame in the middle and flue gas side reducers located on both sides of the steel structure frame. The pipe box 1 306 and the pipe box 2 307 are fixedly connected to the two ends of the steel structure frame respectively.

[0027] The production method of the phenolic resin graphite tube type smoke-water heat exchanger comprises the following steps: S1. Rivet and weld the pipe box 1 306, the pipe box 2 307, and the cover plates on the opposite sides between the pipe box 1 306 and the pipe box 2 307. After riveting and welding, perform nondestructive testing on the welds of the pipe box 1 306, the pipe box 2 307, and the cover plates on the opposite sides between the pipe box 1 306 and the pipe box 2 307. Perform heat treatment if necessary, and perform machining after the inspection is completed. S2. Process the sealing grooves in the tube holes 320 on the tube sheet 305. The compression amount of the sealing grooves is between 15% and 25%. After the sealing grooves are processed, the oil, iron filings and other impurities in the sealing grooves are blown clean. Then, the sealing surfaces of the cover plates on the opposite sides of the tube box 1 306, the tube box 2 307 and the tube box 1 306 and the tube box 2 307 are processed. S3. The steel structure frame and flue gas side reducer are assembled by riveting and welding. The limit deviation of the linear dimensions of the machined and non-machined surfaces shall comply with the requirements of Class M and Class C in GB / T1804-2000. S4. Assemble and weld the pipe box 1 306, the pipe box 2 307 and the steel structure frame. During assembly, the positioning tube should be placed in advance to ensure that the pipe box 1 306 and the pipe box 2 307 are aligned. After welding, remove the positioning tube; S5. Anti-corrosion treatment is performed by applying anti-corrosion paint or glass flakes to the steel structure frame and the tube sheet 305 on the flue gas side, especially to the opposite side of the tube sheet 305; S6. Perform secondary cleaning on the sealing groove of the tube sheet 305 to clean the anti-corrosion paint or glass flakes in the sealing groove, as well as impurities such as rust and iron filings remaining after processing the sealing groove; S7, installing the support plate 321, the support plate 321 is selected from a high temperature resistant non-metallic support plate, generally a thermosetting resin support plate, and the support plate 321 and the steel structure frame are fixed by bolts after being coated with anti-corrosion paint or glass flakes; S8, installing the O-ring and the heat exchange tube 304, first installing the O-ring in the sealing groove of the tube sheet 305 on one side, inserting the heat exchange tube from the tube hole 320 of the tube sheet 305 on the other side, and passing 100-200mm outside the tube sheet 305 where the O-ring is installed, and then installing the O-ring in the sealing groove of the tube sheet 305 where the O-ring is not installed, and after installation, inserting the heat exchange tube 304 into the O-ring to achieve sealing of the heat exchange tube 304; S9. After the heat exchange tube 304 is installed, the cover plate on the opposite side of the tube box 1 306 and the tube box 2 307 is installed. The cover plate on the opposite side of the tube box 1 306 and the tube box 2 307 and the sealing surface of the tube box 1 306 and the tube box 2 307 adopt a concave-convex groove seal. After the installation is completed, an overall water pressure test is performed. If leakage occurs, the leaking part is marked first, and then the leaking part is repaired after the pressure relief is completed. If the size of the sealing groove is unqualified, replace the O-ring with a larger wire diameter. If there are impurities in the sealing groove, clean it and reinstall the heat exchange tube 304. S10, On-site modular assembly.

[0028] An outer insulation layer is fixed on the outer wall of the shell 301 by welding external insulation anchor nails, and the thickness of the outer insulation layer is 80-120 mm; the flatness of the surface of the tube sheet 305 is 0.1-0.15% of the total length, the center distance deviation of adjacent tube holes 320 on the tube sheet 305 is ±0.5 mm, the center distance deviation of any two tube holes 320 is ±1 mm, the coaxiality of the tube holes 320 is less than Φ0.5 mm, and adjacent support plates 321 are connected to each other.

[0029] The steel structure frame and tube sheet 305 on the flue gas side, especially the opposite side of the tube sheet 305, are coated with anti-corrosion paint or glass flakes for anti-corrosion treatment. The support plate 321 is made of thermosetting resin and glass fiber, which can effectively reduce the cost while improving the corrosion resistance of the phenolic resin graphite tube type smoke-water heat exchanger 3 to the low-temperature smoke dew point, and can better meet the use requirements of the phenolic resin graphite tube type smoke-water heat exchanger 3 under complex working conditions; by dividing the phenolic resin graphite tube type smoke-water heat exchanger 3 into multiple modules, the transportation of the equipment is facilitated, and the on-site installation of multiple modules is realized. When the heat exchange tube 304 of one of the modules fails and loses pressure, the valve can be closed separately to cut out the module for maintenance.

[0030] Application of phenolic resin graphite tube type smoke-water heat exchanger, phenolic resin graphite tube type smoke-water heat exchanger 3 is applied to flue gas waste heat recovery system, the flue gas waste heat recovery system comprises phenolic resin graphite tube type smoke-water heat exchanger 3, the flue gas outlet 303 of phenolic resin graphite tube type smoke-water heat exchanger 3 is fixedly connected with desulfurization tower 1 through flue gas pipeline 1 2, the flue gas inlet 302 of phenolic resin graphite tube type smoke-water heat exchanger 3 is fixedly connected with induced draft fan 5 through flue gas pipeline 2 4, and induced draft fan 5 is remote One end of the flue gas pipeline 2 4 is fixedly connected to a dust collector, a bracket 6 is fixedly provided at the bottom end of the phenolic resin graphite tube type flue gas-water heat exchanger 3, a platform 7 is fixedly provided at the top end of the bracket 6, the phenolic resin graphite tube type flue gas-water heat exchanger 3 is fixedly connected to the platform 7, a climbing ladder 8 is fixedly provided on the side wall of the bracket 6 away from the desulfurization tower 1, a platform 2 9 is fixedly provided on the top end of the phenolic resin graphite tube type flue gas-water heat exchanger 3, and the platform 2 9 is arranged between two lifting frames 319.

[0031] The phenolic resin graphite tube type smoke-water heat exchanger 3 is installed between the smoke exhaust port of the induced draft fan 5 and the desulfurization tower 1. The raw water in winter and the desalted water in summer enter the heat exchange tube 304 in the phenolic resin graphite tube type smoke-water heat exchanger 3 through the cold side inlet 308. The high-temperature flue gas transfers the waste heat to the raw water and the desalted water. The hot water after heat transfer can be used to directly replenish the boiler and as heating water for heating. The high-temperature flue gas enters the induced draft fan 5 through the dust collector. The induced draft fan 5 discharges the high-temperature flue gas into the phenolic resin graphite tube type smoke-water heat exchanger 3 through the flue gas pipeline 2 4 for heat exchange. After the heat exchange, the cooled flue gas directly enters the desulfurization tower 1 through the flue gas pipeline 1 2 for absorption and discharge, thereby achieving the purpose of waste heat recovery and reducing energy consumption.

Claims

1. A phenolic resin graphite tube type smoke-water heat exchanger, characterized in that: The invention comprises a shell (301), wherein two ends of the shell (301) are respectively provided with a smoke inlet (302) and a smoke outlet (303), an upper module (317) and a lower module (318) are sequentially provided through the middle of the shell (301) from top to bottom, a pipe box 1 (306) and a pipe box 2 (307) are respectively provided at two ends of the upper module (317) and the lower module (318), a tube sheet (305) is fixedly provided on opposite sides of the pipe box 1 (306) and the pipe box 2 (307), and a pipe sheet (305) is fixedly provided on the inner side of the upper module (317). A plurality of heat exchange tubes (304) are provided between the two tube sheets (305) and between the two tube sheets (305) in the lower module (318); the two ends of the heat exchange tubes (304) are respectively connected to tube box one (306) and tube box two (307); the inner cavity of tube box one (306) is divided into an inlet box and an outlet box by a partition; a cold side inlet (308) is provided at the lower part of the outer wall of tube box one (306) in cooperation with the inlet box; and a cold side outlet (309) is provided at the upper part of the outer wall of tube box one (306) in cooperation with the outlet box.

2. The phenolic resin graphite tube type smoke-water heat exchanger according to claim 1, characterized in that: Flushing ports (310) are provided at the upper and lower portions of the side wall of the shell (301) near the cold side outlet (309); a plurality of sewage outlets (311) are provided at intervals on one side of the bottom end of the shell (301); two inspection ports (312) are provided at the lower portion of the side wall of the shell (301) near the pipe box one (306); the two inspection ports (312) are respectively arranged on both sides of the lower pipe box one (306); a temperature measuring port one (313) and a pressure measuring port one (315) are provided in sequence on the side wall of the shell (301) near the flue gas inlet (302); a temperature measuring port two (314) and a pressure measuring port two (316) are provided in sequence on the side wall of the shell (301) near the flue gas outlet (303); and hanging frames (319) are fixedly provided at both ends of the top end of the shell (301).

3. The phenolic resin graphite tube type smoke-water heat exchanger according to claim 1, characterized in that: A plurality of tube holes (320) are provided on the tube sheet (305) in cooperation with the inlet box and the outlet box at intervals, a sealing groove is provided on the inner wall of each tube hole (320), an O-type sealing ring is fixedly provided in each sealing groove, the heat exchange tube (304) is arranged in the tube hole (320) via the O-type sealing ring, and a plurality of support plates (321) are fixedly provided on the heat exchange tube (304) at intervals.

4. The phenolic resin graphite tube type smoke-water heat exchanger according to claim 3, characterized in that: The support plate (321) is made of thermosetting resin and glass fiber, the heat exchange tube (304) is made of phenolic resin graphite tube, and the phenolic resin graphite tube is a thermosetting polymer phenolic resin and graphite formed in one piece by extrusion, and the outer surfaces of the plurality of heat exchange tubes (304) on the side close to the flue gas inlet (302) are fixedly sleeved with anti-wear tiles (322).

5. The phenolic resin graphite tube type smoke-water heat exchanger according to claim 1, characterized in that: Cover plates are fixedly provided at the upper and lower ends of the shell (301) and the opposite sides of the pipe box 1 (306) and the pipe box 2 (307). The shell (301) includes a steel structure frame in the middle and flue gas side reducers located on both sides of the steel structure frame. The pipe box 1 (306) and the pipe box 2 (307) are fixedly connected to the two ends of the steel structure frame respectively.

6. A method for producing a phenolic resin graphite tube type smoke-water heat exchanger according to any one of claims 1 to 5, characterized in that: The steps include: S1, fix the pipe box 1 (306), the pipe box 2 (307) and the cover plates on the opposite sides between the pipe box 1 (306) and the pipe box 2 (307) by riveting and welding, and after the riveting and welding is completed, perform non-destructive testing on the welds of the pipe box 1 (306), the pipe box 2 (307) and the cover plates on the opposite sides between the pipe box 1 (306) and the pipe box 2 (307), and then assemble the steel structure frame and the flue gas side reducer by riveting and welding to obtain the shell (301); S2, processing the sealing grooves in the plurality of tube holes (320) on the tube sheet (305), and then processing the sealing surfaces of the cover plates on the opposite sides of the tube box 1 (306), the tube box 2 (307), and the tube box 1 (306) and the tube box 2 (307); assembling and welding the tube box 1 (306), the tube box 2 (307) and the steel structure frame, performing anti-corrosion treatment on the flue gas side steel structure frame and the tube sheet (305), and installing the support plate (321) on the steel structure frame; S3. Install O-rings and heat exchange tubes (304) in the sealing grooves of the tube sheets (305) on both sides. After installation, perform an overall water pressure test. After verification, perform modular assembly to obtain a phenolic resin graphite tube type smoke-water heat exchanger.

7. The method for producing a phenolic resin graphite tube type smoke-water heat exchanger according to claim 6, characterized in that: In step S1, a positioning tube should be placed in advance before assembly. An outer insulation layer is fixedly provided on the outer wall of the shell (301) by welding outer insulation anchor nails. The thickness of the outer insulation layer is 80-120 mm.

8. The method for producing a phenolic resin graphite tube type smoke-water heat exchanger according to claim 7, characterized in that: In step S2, the flatness of the surface of the tube sheet (305) is 0.1-0.15% of the entire length, the coaxiality of the tube hole (320) is less than Φ0.5 mm, and adjacent support plates (321) are connected to each other; after assembly and welding, the positioning tube is removed, and the anti-corrosion treatment is to apply anti-corrosion paint or glass flakes.

9. The method for producing a phenolic resin graphite tube type smoke-water heat exchanger according to claim 6, characterized in that: In step S3, the compression amount of the O-ring is between 15% and 25%. After the heat exchange tube (304) is installed, the cover plate on the opposite side of the tube box 1 (306) and the tube box 2 (307) is installed, and the sealing surfaces of the cover plate on the opposite side of the tube box 1 (306) and the tube box 2 (307) and the tube box 1 (306) and the tube box 2 (307) are sealed with a concave-convex groove type.

10. An application of the phenolic resin graphite tube type smoke-water heat exchanger according to any one of claims 1 to 5, characterized in that: The phenolic resin graphite tube type flue gas water heat exchanger is applied to a flue gas waste heat recovery system. The flue gas waste heat recovery system comprises a phenolic resin graphite tube type flue gas water heat exchanger (3). The flue gas outlet (303) of the phenolic resin graphite tube type flue gas water heat exchanger (3) is fixedly connected to a desulfurization tower (1) through a flue gas pipeline 1 (2). The flue gas inlet (302) of the phenolic resin graphite tube type flue gas water heat exchanger (3) is fixedly connected to an induced draft fan (5) through a flue gas pipeline 2 (4). The induced draft fan (5) is fixedly connected to one end of the flue gas pipeline 2 (4). A dust collector is fixedly connected, a bracket (6) is fixedly provided at the bottom end of the phenolic resin graphite tube type flue gas water heat exchanger (3), a platform one (7) is fixedly provided at the top end of the bracket (6), the phenolic resin graphite tube type flue gas water heat exchanger (3) is fixedly connected to the platform one (7), a climbing ladder (8) is fixedly provided on the side wall of the bracket (6) away from the desulfurization tower (1), and a platform two (9) is fixedly provided at the top end of the phenolic resin graphite tube type flue gas water heat exchanger (3), and the platform two (9) is arranged between two hanging frames (319).

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