Evaporator Waste Heat Grading and Recovery Equipment and Control Method

Abstract

This invention provides a staged waste heat recovery and utilization device and its control method for evaporators, relating to the field of evaporator waste heat recovery. It includes: a tubular evaporator shell, with a steam heating pipe installed on the lower side inside the shell. A secondary waste heat recovery pipe is connected to the lower outlet of the steam heating pipe, and a heat exchange tube is connected to the outlet of the secondary waste heat recovery pipe. Condensate is transported to the heat exchange tube through the secondary waste heat recovery pipe, and then the waste heat of the condensate is absorbed by the heat exchange tube and heat-conducting fins. This avoids thermal pollution caused by the emission of low-grade heat energy, significantly reduces the energy consumption cost of enterprise production, and effectively improves the comprehensive energy utilization rate. It solves the problem that although current tubular evaporators can recover the waste heat from the secondary steam outlet, the high-temperature condensate after heat exchange with the high-temperature steam in the steam heating pipe is mostly directly discharged or collected, resulting in the loss of a large amount of low-grade heat energy, causing thermal pollution to the environment and wasting heat energy.

Description

Technical Field

[0001] This invention relates to the field of evaporator waste heat recovery technology, and more particularly to equipment and control methods for graded recovery and utilization of evaporator waste heat. Background Technology

[0002] In industrial production systems, tubular evaporators are widely used in numerous fields such as chemical, food, and pharmaceutical industries due to their high efficiency and stable evaporation performance. In the chemical industry, they play a crucial role in concentrating solutions and separating solutes, aiding in the production and purification of various chemical products. In the food industry, tubular evaporators are commonly used in juice concentration and dairy processing, ensuring food quality and production efficiency. In the pharmaceutical field, they are indispensable equipment, with strict and precise requirements for the evaporation and concentration of drug solutions. However, tubular evaporators generate a significant amount of waste heat during operation. Directly releasing this waste heat into the atmosphere not only wastes energy but may also cause thermal pollution to the environment.

[0003] Currently, although tubular evaporators are equipped with a secondary steam outlet at the top, allowing the waste heat from the steam discharged through the secondary steam outlet to be recovered and utilized via pipelines, the condensate produced by the high-temperature steam in the steam heating pipes inside the tubular evaporator after heat exchange still has a high temperature (usually reaching 50 to 90°C). This high-temperature condensate is usually discharged directly through pipelines or collected in storage tanks, resulting in a large amount of low-grade heat energy being lost into the environment. This not only causes thermal pollution to the environment but also wastes heat energy, significantly increasing the production energy consumption costs of enterprises. Summary of the Invention

[0004] This invention relates to a waste heat recovery and utilization equipment for evaporators and its control method. It solves the problem that, although tubular evaporators can recover the waste heat from the secondary steam outlet, the high-temperature condensate after heat exchange with the high-temperature steam in the steam heating pipes is mostly directly discharged or collected, resulting in the loss of a large amount of low-grade heat energy, which causes thermal pollution to the environment, wastes energy, and increases the energy consumption cost of enterprises.

[0005] The first aspect of this invention provides a waste heat recovery and utilization device for an evaporator and its control method, specifically comprising: a tubular evaporator shell, wherein a liquid inlet is provided on the upper left side of the tubular evaporator shell, a liquid outlet is provided on the bottom of the tubular evaporator shell, and a separation chamber is installed on the top of the tubular evaporator shell; a secondary steam outlet is provided at the upper end of the separation chamber, and a primary waste heat recovery pipe is connected to the upper end of the secondary steam outlet; an upper annular pipe is connected to the outlet end of the primary waste heat recovery pipe; a vertical connecting pipe is connected to the bottom end of the upper annular pipe, and a lower annular pipe is connected to the lower end of the vertical connecting pipe; both the lower annular pipe and the upper annular pipe are installed inside a preheating shell; a steam heating pipe is installed on the lower side inside the tubular evaporator shell, and a secondary waste heat recovery pipe is connected to the outlet end of the steam heating pipe; a heat exchange pipe is connected to the outlet end of the secondary waste heat recovery pipe, and the heat exchange pipe is installed inside a hot air box; a scraping mechanism is provided outside the vertical connecting pipe; and a controller is installed on the support leg of the tubular evaporator shell.

[0006] Furthermore, a liquid inlet is provided on the upper left side of the preheating shell, and a liquid outlet is provided at the bottom of the preheating shell. Both the liquid outlet and the liquid inlet are connected to a liquid conveying pipe, and the two liquid conveying pipes are respectively connected to the inlet and outlet of the conveying pump, which is installed on the top of the hot air box.

[0007] Furthermore, the steam heating pipes are spirally distributed inside the shell of the tubular evaporator, with the right end inlet of the steam heating pipe penetrating through the right side of the shell of the tubular evaporator and the lower end outlet of the steam heating pipe penetrating through the bottom of the shell of the tubular evaporator.

[0008] Furthermore, a sealing top cover is installed on the top of the preheating shell, and a pressure sensor that penetrates the sealing top cover is installed on the sealing top cover, with the lower end of the pressure sensor located inside the preheating shell. A pressure relief port is connected to the upper end face of the sealing top cover, and a solenoid valve is installed on the pressure relief port. A temperature sensor that penetrates the front side of the preheating shell is installed on the lower part of the front side of the preheating shell, with the rear end of the temperature sensor located inside the preheating shell.

[0009] Furthermore, the lower end of the lower annular tube is connected to a discharge pipe, and the discharge pipe penetrates the bottom of the preheating shell; the vertical connecting pipes are distributed in a ring array between the upper and lower annular tubes.

[0010] Furthermore, the heat exchange tubes are arranged in a serpentine pattern inside the hot air box, and heat-conducting fins are provided on the outside of the heat exchange tubes; the left end of the heat exchange tubes penetrates the left side wall of the hot air box.

[0011] Furthermore, the front end of the hot air box is provided with an air inlet duct, and the interior of the air inlet duct is connected to the interior of the hot air box; a fan is installed inside each air inlet duct; and the rear air outlet of the hot air box is connected to a hot air delivery pipe.

[0012] Furthermore, the scraping mechanism includes two annular scraping plates and a drive motor. Each annular scraping plate has circular through holes arranged in a circular array. The number of circular through holes on the annular scraping plates is equal to the number of vertical connecting pipes. The vertical connecting pipes pass through the circular through holes. A connecting frame is fixedly connected between the two annular scraping plates, and a connecting rod is rotatably connected to the top of the connecting frame via a rotating shaft. The drive shaft is rotatably connected to the upper front side of the preheating shell and passes through the front sidewall of the preheating shell. A worm gear and a crank are fixedly connected to the front and rear ends of the drive shaft, respectively. The rear end face of the crank, away from the axis of the drive shaft, is rotatably connected to the upper end of the connecting rod via a rotating shaft. The drive motor is installed on the upper front side of the preheating shell, and a worm gear meshing with the worm gear is installed on the rotating shaft of the drive motor.

[0013] This invention discloses a control method for a graded recovery and utilization device for waste heat from an evaporator, comprising the following steps: First, the feed liquid enters the preheating shell through the feed liquid inlet and is discharged into a lower feed liquid conveying pipe through the feed liquid outlet. Then, the conveying pump is started by the controller to transport the feed liquid in the lower feed liquid conveying pipe to the upper feed liquid conveying pipe. The feed liquid then enters the shell of the tubular evaporator through the feed liquid inlet. Next, high-temperature steam enters the steam heating pipe through the right end of the steam heating pipe to heat the low-temperature feed liquid inside the tubular evaporator shell. After the feed liquid is heated to a certain temperature, steam is generated. The steam then rises and passes through a separation chamber to separate the steam from the concentrated liquid. The steam then enters the upper annular pipe, vertical connecting pipe, and lower annular pipe through the secondary steam outlet and the primary waste heat recovery pipe. The liquid inside the preheating shell is preheated through these pipes. Then, the high-temperature steam inside the steam heating pipe exchanges heat with the liquid inside the tubular evaporator shell to produce condensate. This condensate then enters the heat exchange tube through the secondary waste heat recovery pipe, heating the heat exchange tube and heat-conducting fins. Next, the controller controls the fan to blow external air into the hot air box for heating. The heated air is then transported to industrial dryers and other equipment through hot air delivery pipes, thus enabling the graded recovery and utilization of waste heat generated by the evaporator.

[0014] This invention provides a staged recovery and utilization device for evaporator waste heat and its control method, which has the following beneficial effects:

[0015] This invention utilizes a two-stage waste heat recovery system to generate condensate from high-temperature steam inside a steam heating pipe after heat exchange with the liquid material. The condensate is then transported to the heat exchange tubes, where it absorbs waste heat through the heat exchange tubes and heat-conducting fins. Simultaneously, a fan drives external air through an air inlet duct into a hot air box. Inside the box, the air undergoes thorough heat exchange with the heated heat exchange tubes and heat-conducting fins, generating high-temperature hot air which is then directly supplied to industrial dryers and other equipment via a hot air delivery pipeline. This technology achieves efficient recycling of condensate waste heat, avoiding thermal pollution caused by low-grade heat energy emissions, significantly reducing enterprise production energy costs, and effectively improving overall energy utilization.

[0016] This invention utilizes primary waste heat recovery pipes to transport steam generated after heating the liquid material to the upper annular pipe, vertical connecting pipe, and lower annular pipe. The heat carried by the steam is fully conducted to each pipe, making it a preheating heat source for efficient preheating of the liquid material inside the preheating shell. This design not only realizes the recycling of waste heat from the secondary steam outlet, effectively reducing heat loss, but also significantly improves subsequent heating efficiency and reduces energy costs through preheating of the liquid material. Furthermore, the cooperation of primary and secondary waste heat recovery pipes and other related structures enables the equipment to achieve graded recovery and utilization of waste heat, effectively improving the practicality of the equipment.

[0017] This invention, through the design of a scraping mechanism, enables the cleaning and maintenance of the outer wall of the vertical connecting pipe. Simply start the drive motor via the controller, and the power will sequentially drive the worm gear, worm wheel, and drive shaft to rotate. The drive shaft then drives the crank in a circular motion, causing the upper end of the connecting rod to rotate. The lower end of the connecting rod pulls the connecting frame and two annular scraping plates in a reciprocating up-and-down motion. During this process, the annular scraping plates adhere closely to the outer wall of the vertical connecting pipe, removing attached debris and preventing the accumulation of debris from affecting heat exchange efficiency, thus significantly improving the waste heat recovery efficiency of the equipment. Attached Figure Description

[0018] To more clearly illustrate the technical solution of the present invention, the accompanying drawings of the present invention will be briefly described below.

[0019] In the attached diagram:

[0020] Figure 1 A structural schematic diagram of the overall structure of this application is shown;

[0021] Figure 2 A structural schematic diagram of this application from a rear view is shown;

[0022] Figure 3 This diagram illustrates the structure of this application in its disassembled state.

[0023] Figure 4 A partial cross-sectional structural schematic diagram of the tubular evaporator shell, feed inlet, and feed outlet of this application is shown.

[0024] Figure 5 A schematic diagram of the preheating shell of this application is shown;

[0025] Figure 6 The diagram shows an axial view of the upper annular tube, the vertical connecting tube, the lower annular tube, and the scraping mechanism of this application.

[0026] Figure 7 A schematic diagram of the vertical connecting pipe and scraping mechanism of this application after disassembly is shown;

[0027] Figure 8 A partial cross-sectional structural schematic diagram of the hot air box of this application is shown.

[0028] List of reference numerals

[0029] 1. Tubular evaporator shell; 101. Feed inlet; 102. Feed outlet; 103. Steam heating pipes; 104. Separation chamber; 105. Secondary steam outlet; 106. Controller;

[0030] 2. Preheating shell; 201. Liquid inlet; 202. Liquid outlet; 203. Sealed top cover; 204. Temperature sensor; 205. Pressure sensor; 206. Pressure relief port; 207. Solenoid valve;

[0031] 3. Primary waste heat recovery pipe fittings; 301. Upper annular pipe; 302. Vertical connecting pipe; 303. Lower annular pipe; 304. Discharge pipe;

[0032] 4. Secondary waste heat recovery pipe fittings; 401. Heat exchanger tubes; 402. Heat-conducting fins;

[0033] 5. Hot air box; 501. Air inlet duct; 502. Fan; 503. Hot air delivery pipeline;

[0034] 6. Liquid conveying pipeline;

[0035] 7. Transfer pump;

[0036] 8. Scraping mechanism; 801. Annular scraping plate; 802. Connecting rod; 803. Drive shaft; 804. Crank; 805. Drive motor; 806. Connecting frame; 807. Circular through hole. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Example 1: Please refer to Figures 1 to 8 :

[0039] This invention proposes a waste heat recovery and utilization device for evaporators and its control method, comprising: a tubular evaporator shell 1, a liquid inlet 101 located on the upper left side of the tubular evaporator shell 1, a liquid outlet 102 located at the bottom of the tubular evaporator shell 1, and a separation chamber 104 installed at the top of the tubular evaporator shell 1; a secondary steam outlet 105 located at the upper end of the separation chamber 104, and a primary waste heat recovery pipe fitting 3 connected to the upper end of the secondary steam outlet 105; an upper annular pipe 301 connected to the outlet end of the primary waste heat recovery pipe fitting 3; a vertical connecting pipe 302 connected to the bottom end of the upper annular pipe 301; and a lower annular pipe 303 connected to the lower end of the vertical connecting pipe 302; both the lower annular pipe 303 and the upper annular pipe 301 are installed inside the preheating shell 2; and a steam heating pipe fitting 103 installed on the lower side inside the tubular evaporator shell 1. The lower outlet of the heat pipe fitting 103 is connected to a secondary waste heat recovery pipe fitting 4, and the outlet end of the secondary waste heat recovery pipe fitting 4 is connected to a heat exchange pipe 401, which is installed inside the hot air box 5. A scraping mechanism 8 is provided on the outside of the vertical connecting pipe 302. A controller 106 is installed on the support leg of the tubular evaporator shell 1. The steam generated after heating the liquid through the primary waste heat recovery pipe fitting 3 is transported to the upper annular pipe 301, the vertical connecting pipe 302 and the lower annular pipe 303, making it a preheating heat source to efficiently preheat the liquid in the preheating shell 2, effectively reducing heat loss. Furthermore, the preheating treatment of the liquid significantly improves the subsequent heating efficiency and reduces energy consumption costs. Moreover, through the cooperation of the primary waste heat recovery pipe fitting 3 and the secondary waste heat recovery pipe fitting 4 and other related structures, this equipment can achieve graded recovery and utilization of waste heat.

[0040] A liquid inlet 201 is provided on the upper left side of the preheating shell 2, and a liquid outlet 202 is provided at the bottom of the preheating shell 2. Both the liquid outlet 202 and the liquid inlet 101 are connected to a liquid conveying pipe 6, and the two liquid conveying pipes 6 are respectively connected to the inlet and outlet of the conveying pump 7. The conveying pump 7 is installed on the top of the hot air box 5 and is used to convey the liquid.

[0041] The steam heating pipe 103 is spirally distributed inside the tubular evaporator shell 1, and the right end inlet of the steam heating pipe 103 penetrates through the right side of the tubular evaporator shell 1, while the lower end outlet of the steam heating pipe 103 penetrates through the bottom of the tubular evaporator shell 1, which facilitates connection with the secondary waste heat recovery pipe 4.

[0042] A sealing top cover 203 is installed on the top of the preheating shell 2, and a pressure sensor 205 is installed on the sealing top cover 203, penetrating the sealing top cover 203. The lower end of the pressure sensor 205 is located inside the preheating shell 2. A pressure relief port 206 is connected to the upper end face of the sealing top cover 203, and a solenoid valve 207 is installed on the pressure relief port 206. A temperature sensor 204 is installed on the lower front side of the preheating shell 2, penetrating the front side of the preheating shell 2, and the rear end of the temperature sensor 204 is located inside the preheating shell 2. By setting the temperature sensor 204, the temperature of the liquid inside the preheating shell 2 can be monitored in real time. By setting the pressure sensor 205, the pressure inside the preheating shell 2 can be monitored in real time. When the pressure inside the preheating shell 2 exceeds the preset value, the controller 106 will automatically control the solenoid valve 207 to open, thereby achieving automatic pressure relief.

[0043] The lower end outlet of the lower annular tube 303 is connected to the discharge tube 304, and the discharge tube 304 penetrates the bottom of the preheating shell 2; the vertical connecting tube 302 is distributed in a ring array between the upper annular tube 301 and the lower annular tube 303 to improve the heating effect of the vertical connecting tube 302.

[0044] The heat exchange tubes 401 are arranged in a serpentine pattern inside the hot air box 5, and heat-conducting fins 402 are provided on the outside of the heat exchange tubes 401; the left end of the heat exchange tubes 401 penetrates the left side wall of the hot air box 5, and the left end of the heat exchange tubes 401 is used to discharge the condensate after heat exchange.

[0045] The front end of the hot air box 5 is provided with an air inlet duct 501, and the interior of the air inlet duct 501 is connected to the interior of the hot air box 5; a fan 502 is installed inside each air inlet duct 501; the rear end of the hot air box 5 is connected to a hot air conveying pipe 503, which is used to convey the high temperature hot air inside the hot air box 5 to equipment such as industrial dryers.

[0046] Example 2, based on Example 1, such as Figure 6 and Figure 7As shown, the scraping mechanism 8 includes two annular scraping plates 801 and a drive motor 805. Each annular scraping plate 801 has circular through holes 807 arranged in a circular array. The number of circular through holes 807 on the annular scraping plates 801 is equal to the number of vertical connecting pipes 302. The vertical connecting pipes 302 pass through the circular through holes 807. A connecting frame 806 is fixedly connected between the two annular scraping plates 801, and a connecting rod 802 is rotatably connected to the top of the connecting frame 806 via a rotating shaft. A drive shaft 803 is rotatably connected to the upper front side of the preheating housing 2, and the drive shaft 803 passes through the front sidewall of the preheating housing 2. The front and rear ends are respectively fixedly connected to a worm gear and a crank 804, and the rear end face of the crank 804 is rotatably connected to the upper end of the connecting rod 802 via a rotating shaft at a position away from the axis of the drive shaft 803; the drive motor 805 is installed on the upper front side of the preheating housing 2, and a worm gear meshing with the worm gear is installed on the rotating shaft of the drive motor 805; with the setting of the scraping mechanism 8, when cleaning and maintaining the outer wall of the vertical connecting pipe 302, it is only necessary to start the drive motor 805 through the controller 106, which will eventually move the two annular scraping plates 801 up and down to remove the attached debris, avoid the heat exchange efficiency being affected by the accumulation of debris, and significantly improve the waste heat recovery efficiency of the equipment.

[0047] This invention discloses a control method for a graded recovery and utilization device for waste heat from an evaporator, comprising the following steps: First, the feed liquid enters the preheating shell 2 through the feed liquid inlet 201 and is discharged into a lower feed liquid conveying pipe 6 through the feed liquid outlet 202. Then, the conveying pump 7 is started by the controller 106 to convey the feed liquid in the lower feed liquid conveying pipe 6 to the upper feed liquid conveying pipe 6. Then, the feed liquid enters the tubular evaporator shell 1 through the feed liquid inlet 101. Next, high-temperature steam enters the steam heating pipe 103 through the right end of the steam heating pipe 103 to heat the low-temperature feed liquid inside the tubular evaporator shell 1. After the feed liquid is heated to a certain temperature, steam is generated. Then, the steam rises and is separated from the concentrated liquid in the separation chamber 104. Then, the steam is subjected to secondary evaporation. Steam outlet 105 and primary waste heat recovery pipe 3 enter the upper annular pipe 301, vertical connecting pipe 302 and lower annular pipe 303. The liquid inside the preheating shell 2 is preheated through the upper annular pipe 301, vertical connecting pipe 302 and lower annular pipe 303. Then, the high-temperature steam inside the steam heating pipe 103 exchanges heat with the liquid inside the tubular evaporator shell 1 to produce condensate. The condensate then enters the heat exchange tube 401 through the secondary waste heat recovery pipe 4 to heat the heat exchange tube 401 and the heat-conducting fins 402. Then, the controller 106 controls the fan 502 to blow external air into the hot air box 5 for heating. Then, the heated air is delivered to equipment such as industrial dryers through the hot air delivery pipe 503, thereby recovering and utilizing the waste heat generated by the evaporator in stages.

[0048] The working principle of this invention is as follows: In use, the liquid material first enters the preheating shell 2 through the liquid material inlet 201, and is discharged into the lower liquid material conveying pipe 6 through the liquid material outlet 202. Then, the conveying pump 7 is started by the controller 106, which conveys the liquid material in the lower liquid material conveying pipe 6 to the upper liquid material conveying pipe 6. The liquid material then enters the tubular evaporator shell 1 through the liquid material inlet 101. Next, high-temperature steam (generated by heating water using a steam boiler or similar equipment) enters the steam heating pipe 103 through the right end of the steam heating pipe 103, heating the low-temperature liquid material inside the tubular evaporator shell 1. Steam begins to be generated after reaching a certain temperature. The steam then rises and passes through the separation chamber 104 to effectively separate the vaporized steam from the concentrated liquid. The steam then enters the upper annular pipe 301, the vertical connecting pipe 302, and the lower annular pipe 303 through the secondary steam outlet 105 and the primary waste heat recovery pipe 3. The upper annular pipe 301, the vertical connecting pipe 302, and the lower annular pipe 303 are heated. The liquid inside the preheating shell 2 is preheated through the upper annular pipe 301, the vertical connecting pipe 302, and the lower annular pipe 303, so that the heat of the steam discharged from the secondary steam outlet 105 is recovered and utilized. Furthermore, the heating efficiency of the liquid is improved by preheating the liquid.

[0049] High-temperature steam inside the steam heating pipe 103 exchanges heat with the liquid inside the tubular evaporator shell 1 to produce condensate. The condensate then enters the heat exchange tube 401 through the secondary waste heat recovery pipe 4. Since the condensate produced by the steam heating pipe 103 after heat exchange still has a high temperature, it can heat the heat exchange tube 401 and the heat-conducting fins 402. Then, the controller 106 controls the fan 502 to blow external air into the hot air box 5. The air entering the hot air box 5 is heated by the heat exchange tube 401 and the heat-conducting fins 402. Then, the heated air is transported to equipment such as industrial dryers through the hot air delivery pipe 503. In this way, the waste heat of the condensate produced after steam heat exchange can be recovered and utilized, avoiding the loss of low-grade heat energy into the environment. This not only prevents thermal pollution to the environment but also saves heat energy and significantly reduces the production energy consumption cost of enterprises.

[0050] When maintenance personnel remove debris adhering to the outer wall of the vertical connecting pipe 302 (debris in the liquid tends to accumulate on the outer wall of the vertical connecting pipe 302 over a long period of time), they can start the drive motor 805 via the controller 106. This drives the worm gear, worm wheel, and drive shaft 803 to rotate. The drive shaft 803 then rotates the crank 804, which in turn rotates the upper end of the connecting rod 802. Meanwhile, the lower end of the connecting rod 802 moves the connecting frame 806 and the two annular scraper plates 801 up and down, scraping away the debris adhering to the outer wall of the vertical connecting pipe 302. This effectively improves the waste heat recovery efficiency of the equipment.

[0051] The following points should be noted in this article:

[0052] 1. The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention; other structures can refer to general designs.

[0053] 2. Where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other to obtain new embodiments.

[0054] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. Evaporator waste heat recovery and utilization equipment, including: A tubular evaporator shell (1) is provided with a liquid inlet (101) on the upper left side and a liquid outlet (102) on the bottom. A separation chamber (104) is installed on the top of the tubular evaporator shell (1). The separation chamber (104) is characterized by having a secondary steam outlet (105) at its upper end, and a primary waste heat recovery pipe fitting (3) connected to the upper end of the secondary steam outlet (105). The outlet end of the primary waste heat recovery pipe fitting (3) is connected to an upper annular pipe (301), and a vertical connecting pipe (302) is connected to the bottom end of the upper annular pipe (301). 02) The lower end is connected to a lower annular pipe (303), and both the lower annular pipe (303) and the upper annular pipe (301) are installed inside the preheating shell (2); a steam heating pipe (103) is installed on the lower side inside the shell (1) of the tubular evaporator, and a secondary waste heat recovery pipe (4) is connected to the lower outlet of the steam heating pipe (103). The outlet end of the secondary waste heat recovery pipe (4) is connected to a heat exchange pipe (401), and the heat exchange pipe (401) is installed inside the hot air box (5); a scraping mechanism (8) is provided on the outside of the vertical connecting pipe (302); a controller (106) is installed on the support leg of the shell (1) of the tubular evaporator. The scraping mechanism (8) includes two annular scraping plates (801) and a drive motor (805). Each annular scraping plate (801) has circular through holes (807) arranged in a circular array. The number of circular through holes (807) on the annular scraping plates (801) is equal to the number of vertical connecting pipes (302). The vertical connecting pipes (302) pass through the circular through holes (807). A connecting frame (806) is fixedly connected between the two annular scraping plates (801), and the top of the connecting frame (806) passes through... A connecting rod (802) is rotatably connected to the shaft; a drive shaft (803) is rotatably connected to the upper front side of the preheating shell (2), and the drive shaft (803) passes through the front side wall of the preheating shell (2). The front and rear ends of the drive shaft (803) are respectively fixedly connected to a worm gear and a crank (804), and the rear end face of the crank (804) is rotatably connected to the upper end of the connecting rod (802) through the shaft at a position away from the axis of the drive shaft (803); the drive motor (805) is installed on the upper front side of the preheating shell (2), and a worm gear that meshes with the worm gear is installed on the shaft of the drive motor (805).

2. The evaporator waste heat recovery and utilization equipment according to claim 1, characterized in that: The preheating shell (2) has a liquid inlet (201) on the upper left side and a liquid outlet (202) at the bottom. The liquid outlet (202) and the liquid inlet (101) are both connected to a liquid conveying pipe (6), and the two liquid conveying pipes (6) are respectively connected to the inlet and outlet of the conveying pump (7). The conveying pump (7) is installed on the top of the hot air box (5).

3. The evaporator waste heat recovery and utilization equipment according to claim 1, characterized in that: The steam heating pipe (103) is spirally distributed inside the shell (1) of the tubular evaporator, and the right end inlet of the steam heating pipe (103) penetrates the right side of the shell (1) of the tubular evaporator, and the lower end outlet of the steam heating pipe (103) penetrates the bottom of the shell (1) of the tubular evaporator.

4. The evaporator waste heat recovery and utilization equipment according to claim 1, characterized in that: The preheating shell (2) is equipped with a sealing top cover (203) on the top, and a pressure sensor (205) penetrating the sealing top cover (203) is installed on the sealing top cover (203). The lower end of the pressure sensor (205) is located inside the preheating shell (2). The upper end face of the sealing top cover (203) is connected to a pressure relief port (206), and a solenoid valve (207) is installed on the pressure relief port (206). A temperature sensor (204) penetrating the front side of the preheating shell (2) is installed on the lower front side of the preheating shell (2), and the rear end of the temperature sensor (204) is located inside the preheating shell (2).

5. The evaporator waste heat recovery and utilization equipment according to claim 1, characterized in that: The lower annular pipe (303) has a discharge pipe (304) connected to its lower outlet, and the discharge pipe (304) penetrates the bottom of the preheating shell (2); the vertical connecting pipe (302) is arranged in a ring array between the upper annular pipe (301) and the lower annular pipe (303).

6. The evaporator waste heat recovery and utilization equipment according to claim 1, characterized in that: The heat exchange tubes (401) are arranged in a serpentine pattern inside the hot air box (5), and heat-conducting fins (402) are provided on the outside of the heat exchange tubes (401); the left end of the heat exchange tubes (401) penetrates the left side wall of the hot air box (5).

7. The evaporator waste heat recovery and utilization equipment according to claim 6, characterized in that: The front end of the hot air box (5) is provided with an air inlet duct (501), and the inside of the air inlet duct (501) is connected to the inside of the hot air box (5); a fan (502) is installed inside each air inlet duct (501); the rear air outlet of the hot air box (5) is connected to a hot air delivery pipe (503).

8. The control method for the evaporator waste heat recovery and utilization equipment according to claim 7, characterized in that: Includes the following steps: 1) First, the liquid enters the preheating shell (2) through the liquid inlet (201) and is discharged into the lower liquid conveying pipe (6) through the liquid outlet (202). Then, the conveying pump (7) is started by the controller (106) to convey the liquid in the lower liquid conveying pipe (6) to the upper liquid conveying pipe (6). Then, the liquid enters the tubular evaporator shell (1) through the liquid inlet (101). 2) Next, high-temperature steam enters the steam heating pipe (103) through the right end of the steam heating pipe (103) and heats the low-temperature liquid inside the shell (1) of the tubular evaporator. After the liquid is heated to a certain temperature, steam is generated. Then the steam rises and is separated from the concentrated liquid through the separation chamber (104). Then the steam enters the upper ring pipe (301), the vertical connecting pipe (302) and the lower ring pipe (303) through the secondary steam outlet (105) and the primary waste heat recovery pipe (3). The liquid inside the preheating shell (2) is preheated through the upper ring pipe (301), the vertical connecting pipe (302) and the lower ring pipe (303). 3) Then, the high-temperature steam inside the steam heating pipe (103) exchanges heat with the liquid inside the tubular evaporator shell (1) to generate condensate. The condensate then enters the heat exchange tube (401) through the secondary waste heat recovery pipe (4) to heat the heat exchange tube (401) and the heat-conducting fins (402). Then, the controller (106) controls the fan (502) to blow external air into the hot air box (5) for heating. Then, the heated air is transported to the industrial dryer through the hot air conveying pipe (503), thereby recycling the waste heat generated by the evaporator in stages.

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