A device for preparing high-purity ammonium chloride by evaporating low-concentration ammonia water using waste heat

Abstract

The present invention provides a device for preparing high-purity ammonium chloride by evaporating low-concentration ammonia water by utilizing waste heat, comprising a waste heat recovery box, a reactor, and a separation and purification component, wherein the waste heat recovery box is provided with an air inlet and a first air outlet, the interior of the reactor is provided with a mixing chamber and a heating chamber, the first air outlet is connected to the heating chamber through a first air outlet pipe, the top of the heating chamber is provided with a pressure relief port, the pressure relief port is connected to a pressure relief pipe, a heat energy recovery area and a heat energy exchange area are provided inside the waste heat recovery box, the heat energy recovery area is connected to the air inlet through the air inlet pipe, an end of the air inlet pipe away from the air inlet is connected to a chemical equipment with waste heat, and the heat energy exchange area is tightly fitted with the heat energy recovery area; the separation and purification component comprises an evaporator, a crystallizer, and a purifier, the discharge end of the evaporator is connected to the crystallizer, and the discharge end of the crystallizer is connected to the purifier. Through this design, the utilization of waste heat resources can be maximized and resource waste can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of chemical industry, in particular to a device for preparing high-purity ammonium chloride by evaporating low-concentration ammonia water using waste heat. Background Art

[0002] With the rapid development of the chemical industry, the demand for high-purity chemicals is growing. Ammonium chloride, as an important chemical raw material, has a wide range of applications in agriculture, medicine, electronics, and other fields. However, traditional ammonium chloride production methods often suffer from high energy consumption and severe environmental pollution, which limits the sustainability and economic benefits of its production. Therefore, the development of an efficient and environmentally friendly ammonium chloride production method is particularly important. Chemical production generates a lot of waste heat, most of which is not utilized in energy utilization equipment. This waste heat includes seven types: high-temperature exhaust gas waste heat, cooling medium waste heat, waste steam and waste water waste heat, high-temperature product and slag waste heat, chemical reaction waste heat, combustible waste gas, waste liquid and waste material waste heat, and high-pressure fluid waste heat. According to surveys, the total waste heat resources of various industries account for approximately 17%-67% of their total fuel consumption, and recyclable waste heat resources account for approximately 60% of the total waste heat resources. If waste heat can be rationally utilized, enterprises can not only reduce production costs and improve economic benefits, but also reduce environmental pollution and achieve green production.

[0003] The object of the present invention is to provide a device for preparing high-purity ammonium chloride by evaporating low-concentration ammonia water using waste heat, so as to solve the problems mentioned in the above background technology. Summary of the Invention

[0004] To achieve the above-mentioned purpose, the present invention provides a device for preparing high-purity ammonium chloride by evaporating low-concentration ammonia water by utilizing waste heat, comprising a waste heat recovery box, a reactor, and a separation and purification component. The waste heat recovery box is provided with an air inlet and a first air outlet. The interior of the reactor is provided with a mixing chamber and a heating chamber. The first air outlet is communicated with the heating chamber through a first air outlet pipe. The top of the heating chamber is provided with a pressure relief port, the pressure relief port is connected to a pressure relief pipe, a pressure sensor 1 is provided on one side of the pressure relief port, a pressure relief valve is provided on the pressure relief pipe, an ammonia water injection port is provided on the top of the mixing chamber, and the ammonia water injection port is provided. The inlet is connected to an ammonia injection pipe, which passes through the top of the reactor. The mixing chamber is provided with a reactant injection port near the ammonia injection port. The reactant injection port is connected to a reactant injection pipe, and the top of the reactant injection pipe passes through the reactor and is connected to the raw material system. The interior of the waste heat recovery box is provided with a heat recovery area and a heat exchange area. The heat recovery area is connected to the air inlet through an air inlet pipe. The end of the air inlet pipe away from the air inlet is connected to a chemical equipment with waste heat. The heat exchange area is tightly fitted with the heat recovery area.

[0005] The separation and purification component includes an evaporator, a crystallizer, and a purifier. The evaporator is provided with a heating device, the heat exchange area is connected to a hot water tank, the hot water tank is connected to a steam pump, the air inlet and air outlet of the steam pump are respectively connected to the top of the evaporator and the heating device, the air outlet of the steam pump is connected to an air supply pipe, the air supply pipe is provided with a bronchial pipe, the bronchial pipe is connected to the crystallizer, the evaporator is also provided with a feed port, the feed port is connected to a feed pipe, a discharge port is provided at one end of the bottom of the mixing chamber, the discharge port is connected to a discharge pipe, the end of the discharge pipe away from the discharge port passes through the reactor and is connected to a pumping pump, the discharge end of the pumping pump is connected to the feed pipe, the discharge end of the evaporator is connected to the crystallizer, and the crystallizer is connected to the purifier.

[0006] As a further improvement of the present invention, a stirring rod is installed in the mixing chamber, and a plurality of stirring blades are provided on the stirring rod. One end of the stirring rod is connected to a driving component, and the driving component is arranged outside the reactor;

[0007] The driving component includes a driving pulley, a driven pulley, and a driving motor. The driving motor is installed on the top of the waste heat recovery box. The output end of the driving motor is fixedly connected to the driving pulley. The driving pulley and the driven pulley are connected by a belt. The driven pulley is connected to the stirring rod.

[0008] As a further improvement of the present invention, a first branch pipe and a second branch pipe are connected to the air inlet pipe of the waste heat recovery box, the first branch pipe is connected to the heat energy recovery area, a second recovery area is provided between the heat energy recovery area and the waste heat recovery box, the second branch pipe is connected to the second recovery area, and is symmetrically installed on both sides of the first branch pipe, and a second air outlet is also provided on the waste heat recovery box, the second air outlet is connected to a second air outlet pipe, and the second air outlet pipe is connected to the drying chamber of the purifier.

[0009] As a further improvement of the present invention, the heat energy exchange zone includes an annular tube, which is wound around the outer wall of the heat energy recovery zone. The water inlet end of the annular tube is connected to the cold water tank, and the water outlet end of the annular tube is connected to the hot water tank. The hot water tank is connected to the drying chamber of the purifier through a hot water pipe, and the steam pump is connected to the hot water tank through a connecting pipe.

[0010] As a further improvement of the present invention, the evaporator includes a tank body, and the interior of the tank body is provided with a demister, an evaporation chamber, and a feed chamber in sequence from top to bottom. The heating device is arranged between the evaporation chamber and the feed chamber, and the feed port is arranged on one side of the feed chamber. The feed pipe is connected to the feed port, and a flow meter is provided on the feed pipe. A discharge port is provided at the bottom of the feed chamber, and the discharge port is connected to a discharge pipe, and the discharge pipe is connected to a screw pump. The discharge end of the screw pump is connected to the crystallizer.

[0011] As a further improvement of the present invention, the top of the tank body is connected to a steam pipe, the steam pipe is connected to the steam pump, the top of the tank body is also connected to a condenser, the condenser is connected to a cooler, a pressure valve is provided on the condenser, one end of the cooler is connected to a condensate pump, a branch pipe is provided on the condenser and is connected to the crystallizer, an exhaust pipe is also provided on one end of the cooler close to the condenser, and the exhaust pipe is connected to a vacuum pump.

[0012] As a further improvement of the present invention, the crystallizer includes a crystallization chamber, a circulation pump, and a heat exchanger. The water inlet end of the heat exchanger is connected to the circulation pump, the circulation pump is communicated with the crystallization chamber, the water outlet end of the heat exchanger is communicated with the crystallizer, the cooling port of the heat exchanger is connected to the condensate pump, the water outlet of the heat exchanger is connected to the condenser pipe of the cooler, and a crystal outlet is provided at the bottom of the crystallization chamber. The crystal outlet is connected to a crystal row pipe, and the crystal row pipe is communicated with the feed end of the purifier.

[0013] As a further improvement of the present invention, the purifier includes a box body, a centrifugal chamber and a drying chamber are provided inside the box body, one side of the discharge end of the centrifugal chamber is connected to the drying chamber, a centrifuge is provided in the centrifugal chamber, the other side of the discharge end of the centrifugal chamber is connected to the centrifuge, and the discharge end of the centrifuge is connected to the drying chamber through a pipeline.

[0014] As a further improvement of the present invention, the centrifuge includes a rotor, a centrifugal cylinder, a filter, a two-stage piston pushing mechanism, a hydraulic cylinder, a main motor, and a pushing device. The main motor is used to drive the rotor and the centrifugal cylinder. The filter is detachably installed in the centrifugal cylinder. The pushing device is arranged in the filter. The pushing device is connected to the hydraulic cylinder, and the discharge end on the centrifugal cylinder is connected to the drying chamber.

[0015] As a further improvement of the present invention, the drying chamber includes a material chamber, a drying chamber, and a holding chamber, wherein the material chamber is provided with a material inlet and a material outlet, the material inlet is connected to the discharge end of the centrifuge through a pipe, and the material outlet is connected to a precipitation pipe, the drying chamber is arranged outside the material chamber, and the holding chamber is arranged between the drying chamber and the inner wall of the drying chamber;

[0016] The drying chamber is connected to the water outlet of the hot water tank through a water delivery pipe. A drain port is provided on one side of the bottom end of the drying chamber. The drain port is connected to a drain pipe. A drain valve is provided on the drain pipe. The insulation chamber is communicated with the second air outlet pipe on the waste heat recovery tank. The insulation chamber is also provided with a pressure reducing port. The pressure reducing port is connected to a pressure reducing pipe. A pressure reducing valve is provided on the pressure reducing pipe. A second pressure sensor is provided at the pressure reducing port.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention is provided with a waste heat recovery box, which collects the waste heat generated by the chemical equipment during use through the air inlet pipe therein, and the collected waste heat is respectively transported to the heat recovery area and the second recovery area through the first branch pipe and the second branch pipe connected to the air inlet pipe. An annular pipe is wound on the outer wall of the heat recovery area, and the cold water in the annular pipe is heated by the waste heat exhaust gas in the heat recovery area and the second recovery area, thereby realizing the recovery and utilization of the waste heat exhaust gas. The hot steam generated by the heated water in the annular pipe is used to be transported to the heating device of the evaporator for recycling and utilization. The waste heat exhaust gas in the heat recovery area is transported to the reactor through the first outlet pipe to preheat the material in the reactor. The excess waste heat in the second recovery area is then transported to the drying chamber. Through this design, the collection and utilization of waste heat is maximized to avoid waste of resources.

[0019] 2. The present invention is provided with a reactor, a mixing chamber and a heating chamber are provided in the reactor, a stirring rod and a plurality of stirring blades are provided inside the mixing chamber, which are conducive to the effective mixing of ammonia water and reactants and the improvement of the reaction rate. A heating chamber is provided outside the mixing chamber, which can recycle and reuse the excess heat in the waste heat recovery box. At the same time, the temperature of the preheated material is higher, which helps to evaporate and concentrate faster in the evaporator, thereby improving the production efficiency and yield of ammonium chloride. Furthermore, the preheated material is easier to reach the required evaporation temperature in the evaporator, reducing the additional energy required to reach the evaporation temperature, thereby reducing the overall energy consumption.

[0020] 3. The present invention is provided with an evaporator and a crystallizer. The preheated mixed feed liquid is transported to the evaporator, and the water in the feed liquid is evaporated into secondary steam. The concentrated solution is transported to the crystallization chamber of the crystallizer through a screw pump connected to a discharge pipe at the bottom of the feed chamber for crystallization treatment. The secondary steam separated from the evaporation chamber is compressed by a steam compressor, and a portion is sent back to the heating chamber of the evaporator for use as heating steam, thereby realizing energy recycling, and a portion is recycled through a cooler. When the crystallization chamber crystallizes the feed liquid, the high-temperature steam compressed by the steam compressor is transported to the crystallization chamber through an air pipe. The concentrated liquid enters the crystallization chamber from the feed end and evaporates the water therein under the action of the high-temperature steam to precipitate ammonium chloride crystals. In this process, the superheated high-temperature solution is extracted from the crystallization chamber by a circulating pump and transported to a heat exchanger for cooling before being transported to the crystallization chamber to ensure that the solution in the crystallization chamber can maintain a stable temperature and concentration, ensure that the crystallization process proceeds normally, and thus obtain a high-quality crystallized product. The solid-liquid mixture obtained after crystallization treatment is then transported to a purifier for subsequent treatment.

[0021] 4. The present invention is provided with a purifier, and a separation chamber and a drying chamber are provided inside the purifier. The solid-liquid mixture can be effectively separated by a centrifuge in the separation chamber to obtain ammonium chloride crystals. The obtained ammonium chloride crystals are then transported to the material chamber of the drying chamber. By discharging the hot water heated in the waste heat recovery box into the drying chamber, hot water can be provided to the material in the material chamber for drying. Furthermore, the waste heat exhaust gas in the second recovery area of ​​the waste heat recovery box is injected into the insulation chamber, which can provide a heat source for the water source in the heating chamber while also providing insulation. The heating chamber wraps the four sides of the material chamber, so that the materials around the material chamber can be evenly heated, which can not only maximize resource utilization but also improve drying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the connection structure between the waste heat recovery box and the reactor of the present invention.

[0024] Figure 3 This is a three-dimensional structural diagram of the internal connection between the waste heat recovery box and the reactor of the present invention.

[0025] Figure 4 This is a schematic diagram of the internal structure of the waste heat recovery box of the present invention.

[0026] Figure 5 It is a schematic diagram of the internal structure of the reactor of the present invention.

[0027] Figure 6 It is a cross-sectional view of the evaporator, crystallizer and purifier of the present invention.

[0028] In the figure: 1, waste heat recovery tank; 101, heat recovery area; 102, annular pipe; 103, second recovery area; 104, air inlet pipe; 105, first branch pipe; 106, second branch pipe; 107, first air outlet pipe; 108, second air outlet pipe; 109, hot water tank; 110, water delivery pipe;

[0029] 2. Reactor; 201. Mixing chamber; 202. Heating chamber; 203. Stirring rod; 204. Stirring blade; 205. Driving pulley; 206. Driven pulley; 207. Driving motor; 208. Ammonia injection pipe; 209. Reactant injection pipe; 210. Pressure relief pipe; 211. Pressure sensor 1; 212. Discharge pipe; 213. Feed pump;

[0030] 3. Evaporator; 301. Tank; 302. Defoamer; 303. Evaporation chamber; 304. Feed chamber; 305. Heating device; 306. Steam pump; 307. Screw pump; 308. Steam pipe; 309. Condenser; 310. Cooler; 311. Condensate pump; 312. Exhaust pipe; 313. Vacuum pump;

[0031] 4. Crystallizer; 401. Crystallization chamber; 402. Circulation pump; 403. Heat exchanger; 404. Crystallizer pipe;

[0032] 5. Purifier; 501. Box; 502. Centrifugal chamber; 503. Drying chamber; 504. Material chamber; 505. Drying chamber; 506. Insulation chamber. DETAILED DESCRIPTION

[0033] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0035] The present invention will be further described in detail below with reference to the accompanying drawings. Example 1

[0036] See also Figure 1-6The present invention provides a device for preparing high-purity ammonium chloride by evaporating low-concentration ammonia water by utilizing waste heat, comprising a waste heat recovery box 1, a reactor 2, and a separation and purification component. The waste heat recovery box 1 is provided with an air inlet and a first air outlet. The interior of the reactor 2 is provided with a mixing chamber 201 and a heating chamber 202. The first air outlet is communicated with the heating chamber 202 through a first air outlet pipe 107. The top of the heating chamber 202 is provided with a pressure relief port, the pressure relief port is connected to a pressure relief pipe 210, one side of the pressure relief port is provided with a pressure sensor 211, the pressure relief pipe 210 is provided with a pressure relief valve, the top of the mixing chamber 201 is provided with an ammonia water injection port, the ammonia water injection port is connected to An ammonia injection pipe 208 is provided, and the ammonia injection pipe 208 passes through the top of the reactor 2. A reactant injection port is provided in the mixing chamber 201 near the ammonia injection port. The reactant injection port is connected to a reactant injection pipe 209. The top of the reactant injection pipe 209 passes through the reactor 2 and is connected to the raw material system. A heat recovery area 101 and a heat exchange area are provided inside the waste heat recovery box 1. The heat recovery area 101 is connected to the air inlet through an air inlet pipe 104. The end of the air inlet pipe 104 away from the air inlet is connected to a chemical equipment with waste heat. The heat exchange area is tightly fitted with the heat recovery area 101.

[0037] The separation and purification component includes an evaporator 3, a crystallizer 4, and a purifier 5. The evaporator 3 is provided with a heating device 305. The heat exchange area is connected to a hot water tank 109, and the hot water tank 109 is connected to a steam pump 306. The air inlet and air outlet of the steam pump 306 are respectively connected to the top of the evaporator 3 and the heating device 305. The air outlet of the steam pump 306 is connected to a gas pipe. The gas pipe is provided with a bronchus, and the bronchus is connected to the crystallizer 4. The evaporator 3 is also provided with a feed port, and the feed port is connected to a feed pipe. A discharge port is provided at one end of the bottom of the mixing chamber 201, and the discharge port is connected to a discharge pipe 212. The end of the discharge pipe 212 away from the discharge port passes through the reactor 2 and is connected to a pumping pump 213. The discharge end of the pumping pump 213 is connected to the feed pipe. The discharge end of the evaporator 3 is connected to the crystallizer 4, and the crystallizer 4 is connected to the purifier 5.

[0038] The air inlet pipe 104 of the waste heat recovery box 1 is connected to a first branch pipe 105 and a second branch pipe 106. The first branch pipe 105 is communicated with the heat recovery area 101. A second recovery area 103 is provided between the heat recovery area 101 and the waste heat recovery box 1. The second branch pipe 106 is communicated with the second recovery area 103 and is symmetrically installed on both sides of the first branch pipe 105. The waste heat recovery box 1 is also provided with a second air outlet. The second air outlet is connected to a second air outlet pipe 108. The second air outlet pipe 108 is communicated with the drying chamber 503 of the purifier 5.

[0039] The heat exchange zone includes an annular tube 102, which is wound around the outer wall of the heat recovery zone 101. The water inlet end of the annular tube 102 is connected to the cold water tank, and the water outlet end of the annular tube 102 is connected to the hot water tank 109. The hot water tank 109 is connected to the drying chamber 503 of the purifier 5 through a hot water pipe, and the steam pump 306 is connected to the hot water tank 109 through a connecting pipe.

[0040] During use, the waste heat generated by the chemical equipment is collected through the air inlet pipe 104, and the collected waste heat is respectively transported to the heat recovery area 101 and the second recovery area 103 through the first branch pipe 105 and the second branch pipe 106 connected to the air inlet pipe 104. An annular pipe 102 is wound around the outer wall of the heat recovery area 101, and the cold water in the annular pipe 102 is heated by the waste heat exhaust gas in the heat recovery area 101 and the second recovery area 103, so as to realize the recycling of the waste heat exhaust gas. The hot steam generated by the heated water in the annular pipe 102 is used to be transported to the heating device 305 of the evaporator 3 for recycling. The waste heat exhaust gas in the heat recovery area 101 is transported to the reactor 2 through the first outlet pipe 107 to preheat the material in the reactor 2. The excess waste heat in the second recovery area 103 is then transported to the drying chamber 503. Through this design, the collection and utilization of waste heat is maximized to avoid waste of resources. Example 2

[0041] See also Figure 1 、 Figure 3 、 Figure 5The reactor 2 is provided with a mixing chamber 201 and a heating chamber 202 inside, the first air outlet is communicated with the heating chamber 202 through the first air outlet pipe 107, the top of the heating chamber 202 is provided with a pressure relief port, the pressure relief port is connected to a pressure relief pipe 210, a pressure sensor 211 is provided on one side of the pressure relief port, and a pressure relief valve is provided on the pressure relief pipe 210. An ammonia injection port is provided at the top of the mixing chamber 201, the ammonia injection port is connected to an ammonia injection pipe 208, and the ammonia injection pipe 208 passes through the top of the reactor 2, and a reactant injection port is provided at a position near the ammonia injection port in the mixing chamber 201, the reactant injection port is connected to a reactant injection pipe 209, and the top of the reactant injection pipe 209 passes through the reactor 2 and is connected to the raw material system;

[0042] A stirring rod 203 is installed in the mixing chamber 201, and a plurality of stirring blades 204 are provided on the stirring rod 203. One end of the stirring rod 203 is connected to a driving component, and the driving component is arranged outside the reactor 2;

[0043] The driving component includes a driving pulley 205, a driven pulley 206, and a driving motor 207. The driving motor 207 is installed on the top of the waste heat recovery box 1. The output end of the driving motor 207 is fixedly connected to the driving pulley 205. The driving pulley 205 and the driven pulley 206 are connected by a belt. The driven pulley 206 is connected to the stirring rod 203.

[0044] During use, a mixing chamber 201 and a heating chamber 202 are provided in the reactor 2. A stirring rod 203 and a plurality of stirring blades 204 are provided inside the mixing chamber 201, which are conducive to the effective mixing of ammonia water and reactants and the improvement of the reaction rate. A heating chamber 202 is provided outside the mixing chamber 201, which can recycle and reuse the excess heat in the waste heat recovery box 1. At the same time, the temperature of the preheated material is higher, which helps to evaporate and concentrate faster in the evaporator 3, thereby improving the production efficiency and yield of ammonium chloride. Furthermore, the preheated material is easier to reach the required evaporation temperature in the evaporator 3, reducing the additional energy required to reach the evaporation temperature, thereby reducing the overall energy consumption. Example 3

[0045] See also Figure 1 、 Figure 6The evaporator 3 includes a tank body 301, and the interior of the tank body 301 is provided with a demister 302, an evaporation chamber 303, and a feed chamber 304 from top to bottom. The heating device 305 is arranged between the evaporation chamber 303 and the feed chamber 304, and the feed port is arranged on one side of the feed chamber 304. The feed pipe is connected to the feed port, and a flow meter is provided on the feed pipe. A discharge port is provided at the bottom of the feed chamber 304, and the discharge port is connected to a discharge pipe, and the discharge pipe is connected to a screw pump 307. The discharge end of the screw pump 307 is connected to the crystallizer 4.

[0046] The top of the tank body 301 is connected to a steam pipe 308, and the steam pipe 308 is connected to the steam pump 306. The top of the tank body 301 is also connected to a condenser 309, and the condenser 309 is connected to a cooler 310. A pressure valve is provided on the condenser 309. One end of the cooler 310 is connected to a condensate pump 311. A branch pipe is provided on the condenser 309 and is connected to the crystallizer 4. An exhaust pipe 312 is also provided on the end of the cooler 310 close to the condenser 309, and the exhaust pipe 312 is connected to a vacuum pump 313.

[0047] The crystallizer 4 includes a crystallization chamber 401, a circulation pump 402, and a heat exchanger 403. The water inlet of the heat exchanger 403 is connected to the circulation pump 402, and the circulation pump 402 is communicated with the crystallization chamber 401. The water outlet of the heat exchanger 403 is communicated with the crystallizer 4. The cooling port of the heat exchanger 403 is connected to the condensation water pump 311, and the water outlet of the heat exchanger 403 is connected to the condensation pipe 309 of the cooler 310. A crystal outlet is provided at the bottom of the crystallization chamber 401, and the crystal outlet is connected to a crystal drain pipe 404. The crystal drain pipe 404 is communicated with the feed end of the purifier 5.

[0048] During use, the mixed feed liquid after preheating is transported to the evaporator 3, where the water in the feed liquid is evaporated into secondary steam, and the concentrated solution is transported to the crystallization chamber 401 of the crystallizer 4 through the screw pump 307 connected to the discharge pipe at the bottom of the feed chamber 304 for crystallization treatment. The secondary steam separated from the evaporation chamber 303 is compressed by the steam compressor, and part of it is sent back to the heating chamber 202 of the evaporator 3 as heating steam, thus realizing the recycling of energy, and part of it is recycled through the cooler 310. When the crystallization chamber 401 is crystallizing the feed liquid, the high-temperature steam compressed by the steam compressor is transported to the crystallization chamber 401 through the gas pipe. 1, the concentrated liquid enters the crystallization chamber 401 from the feed end, and the water therein is evaporated under the action of high-temperature steam to precipitate ammonium chloride crystals. In this process, the superheated high-temperature solution is extracted from the crystallization chamber 401 by the circulating pump 402 and transported to the heat exchanger 403 for cooling before being transported to the crystallization chamber 401 to ensure that the solution in the crystallization chamber 401 can maintain a stable temperature and concentration, ensure that the crystallization process proceeds normally, and thus obtain a high-quality crystallized product. The solid-liquid mixture obtained after the crystallization treatment is then transported to the purifier 5 for subsequent treatment. In this embodiment, due to line of sight obstruction, the detailed position of the connection between the heat exchanger and the crystallizer 4 cannot be shown in the figure. Example 4

[0049] See also Figure 6 The purifier 5 includes a box body 501, and a centrifugal chamber 502 and a drying chamber 503 are provided inside the box body 501. One side of the discharge end of the centrifugal chamber 502 is connected to the drying chamber 503. A centrifuge is provided in the centrifugal chamber 502, and the other side of the discharge end of the centrifugal chamber 502 is connected to the centrifuge. The discharge end of the centrifuge is connected to the drying chamber 503 through a pipeline.

[0050] The centrifuge includes a rotor, a centrifugal cylinder, a filter, a two-stage piston pushing mechanism, a hydraulic cylinder, a main motor, and a pushing device. The main motor is used to drive the rotor and the centrifugal cylinder. The filter is detachably installed in the centrifugal cylinder. The pushing device is arranged in the filter. The pushing device is connected to the hydraulic cylinder. The discharge end on the centrifugal cylinder is connected to the drying chamber 503.

[0051] The drying chamber 503 includes a material chamber 504, a drying chamber 505, and a holding chamber 506. The material chamber 504 is provided with a material inlet and a material outlet. The material inlet is connected to the discharge end of the centrifuge through a pipe, and the material outlet is connected to a precipitation pipe. The drying chamber 505 is arranged outside the material chamber 504, and the holding chamber 506 is arranged between the drying chamber 505 and the inner wall of the drying chamber 503;

[0052] The drying chamber 505 is connected to the water outlet end of the hot water tank 109 through a water delivery pipe 110. A drain port is provided on one side of the bottom end of the drying chamber 505. The drain port is connected to a drain pipe, and a drain valve is provided on the drain pipe. The insulation chamber 506 is connected to the second air outlet pipe 108 on the waste heat recovery tank 1. The insulation chamber 506 is also provided with a pressure reducing port, which is connected to a pressure reducing pipe, and a pressure reducing valve is provided on the pressure reducing pipe. A pressure sensor 2 is provided at the pressure reducing port.

[0053] During use, a separation chamber and a drying chamber 503 are provided inside the purifier 5. Through the centrifuge in the separation chamber, the centrifuge here adopts a two-stage pusher centrifuge. During its working process, the mixture discharged from the crystallizer 4 first enters the centrifuge cylinder through the feeding pipe on the centrifuge, and is separated into solid and liquid parts under the action of centrifugal force. As the centrifuge cylinder continues to rotate, the scrubbing plate cleans the solid phase impurities and discharges them through the scraper, so that the centrifugal process forms a continuous cycle, and finally achieves the purpose of solid-liquid separation, and can effectively separate the solid-liquid mixture, thereby obtaining purer ammonium chloride crystals, which are then transported to the material chamber 50 of the drying chamber 503. 4, by discharging the hot water heated in the waste heat recovery box 1 into the drying chamber 505, hot water can be provided to dry the material in the material chamber 504. Further, the waste heat exhaust gas in the second recovery area 103 in the waste heat recovery box 1 is injected into the insulation chamber 506, which can provide a heat source for the water source of the heating chamber 202 while also being able to keep it warm. The heating chamber 202 wraps around the material chamber 504, which can evenly heat the materials around the material chamber 504, which can maximize resource utilization and improve drying efficiency. The centrifuge in this embodiment adopts a two-stage pusher centrifuge, which is a prior art and will not be elaborated on in detail.

[0054] The above description of the present invention is exemplified in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A device for preparing high-purity ammonium chloride by evaporating low-concentration ammonia water using waste heat, characterized in that: The invention comprises a waste heat recovery box (1), a reactor (2), and a separation and purification component, wherein the waste heat recovery box (1) is provided with an air inlet and a first air outlet, the interior of the reactor (2) is provided with a mixing chamber (201) and a heating chamber (202), the first air outlet is communicated with the heating chamber (202) through a first air outlet pipe (107), the top of the heating chamber (202) is provided with a pressure relief port, the pressure relief port is connected to a pressure relief pipe (210), one side of the pressure relief port is provided with a pressure sensor (211), the pressure relief pipe (210) is provided with a pressure relief valve, the top of the mixing chamber (201) is provided with an ammonia injection port, the ammonia injection port is connected to an ammonia injection pipe (208), the ammonia injection port is connected to the ammonia injection pipe (208), and the ammonia injection port is connected to the ammonia injection pipe (208). A water injection pipe (208) passes through the top of the reactor (2); a reactant injection port is provided in the mixing chamber (201) near the ammonia injection port; the reactant injection port is connected to a reactant injection pipe (209); the top of the reactant injection pipe (209) passes through the reactor (2) and is connected to the raw material system; a heat recovery zone (101) and a heat exchange zone are provided inside the waste heat recovery box (1); the heat recovery zone (101) is communicated with the air inlet via an air inlet pipe (104); an end of the air inlet pipe (104) away from the air inlet is communicated with a chemical equipment with waste heat; and the heat exchange zone is closely fitted with the heat recovery zone (101); The separation and purification component comprises an evaporator (3), a crystallizer (4), and a purifier (5). The evaporator (3) is provided with a heating device (305). The heat exchange zone is connected to a hot water tank (109). The hot water tank (109) is connected to a steam pump (306). The air inlet and air outlet of the steam pump (306) are respectively connected to the top of the evaporator (3) and the heating device (305). The air outlet of the steam pump (306) is connected to an air supply pipe. The air supply pipe is provided with a bronchus. The bronchus is connected to the crystallizer. (4), the evaporator (3) is also provided with a feed port, the feed port is connected to a feed pipe, a discharge port is provided at one end of the bottom of the mixing chamber (201), the discharge port is connected to a discharge pipe (212), the discharge pipe (212) is connected to an end away from the discharge port, passes through the reactor (2) and is connected to a pumping pump (213), the discharge end of the pumping pump (213) is connected to the feed pipe, the discharge end of the evaporator (3) is connected to the crystallizer (4), and the crystallizer (4) is connected to the purifier (5); The air inlet pipe (104) of the waste heat recovery box (1) is connected to a first branch pipe (105) and a second branch pipe (106), the first branch pipe (105) is in communication with the heat recovery zone (101), a second recovery zone (103) is provided between the heat recovery zone (101) and the waste heat recovery box (1), the second branch pipe (106) is in communication with the second recovery zone (103), and is symmetrically installed on both sides of the first branch pipe (105), the waste heat recovery box (1) is also provided with a second air outlet, the second air outlet is connected to a second air outlet pipe (108), and the second air outlet pipe (108) is in communication with the drying chamber (503) of the purifier (5); The evaporator (3) comprises a tank body (301), wherein the interior of the tank body (301) is provided with a demister (302), an evaporation chamber (303), and a feed chamber (304) in order from top to bottom, the heating device (305) is arranged between the evaporation chamber (303) and the feed chamber (304), the feed port is arranged on one side of the feed chamber (304), the feed pipe is communicated with the feed port, a flow meter is provided on the feed pipe, a discharge port is provided at the bottom of the feed chamber (304), the discharge port is connected to a discharge pipe, the discharge pipe is connected to a screw pump (307), and the discharge end of the screw pump (307) is connected to the crystallizer (4); The top of the tank body (301) is connected to a steam pipe (308), which is connected to the steam pump (306). The top of the tank body (301) is also connected to a condenser (309), which is connected to a cooler (310). A pressure valve is provided on the condenser (309). One end of the cooler (310) is connected to a condensate pump (311). A branch pipe is provided on the condenser (309) and is connected to the crystallizer (4). An exhaust pipe (312) is also provided on one end of the cooler (310) close to the condenser (309), and the exhaust pipe (312) is connected to a vacuum pump (313).

2. The device for preparing high-purity ammonium chloride by utilizing waste heat to evaporate low-concentration ammonia water according to claim 1, characterized in that: A stirring rod (203) is installed in the mixing chamber (201), and a plurality of stirring blades (204) are provided on the stirring rod (203). One end of the stirring rod (203) is connected to a driving component, and the driving component is arranged outside the reactor (2); The driving component comprises a driving pulley (205), a driven pulley (206), and a driving motor (207); the driving motor (207) is mounted on the top of the waste heat recovery box (1); an output end of the driving motor (207) is fixedly connected to the driving pulley (205); the driving pulley (205) and the driven pulley (206) are connected via a belt; and the driven pulley (206) is connected to the stirring rod (203).

3. The device for preparing high-purity ammonium chloride by utilizing waste heat to evaporate low-concentration ammonia water according to claim 1, characterized in that: The heat exchange zone includes an annular tube (102), which is wound around the outer wall of the heat recovery zone (101). The water inlet end of the annular tube (102) is connected to the cold water tank, and the water outlet end of the annular tube (102) is connected to the hot water tank (109). The hot water tank (109) is connected to the drying chamber (503) of the purifier (5) through a hot water pipe, and the steam pump (306) is connected to the hot water tank (109) through a connecting pipe.

4. The device for preparing high-purity ammonium chloride by utilizing waste heat to evaporate low-concentration ammonia water according to claim 1, characterized in that: The crystallizer (4) includes a crystallization chamber (401), a circulation pump (402), and a heat exchanger (403). The water inlet of the heat exchanger (403) is connected to the circulation pump (402), the circulation pump (402) is communicated with the crystallization chamber (401), the water outlet of the heat exchanger (403) is communicated with the crystallizer (4), the cooling port of the heat exchanger (403) is connected to the condensation water pump (311), the water outlet of the heat exchanger (403) is connected to the condensation pipe (309) of the cooler (310), and a crystal outlet is provided at the bottom of the crystallization chamber (401). The crystal outlet is connected to a crystal drain pipe (404), and the crystal drain pipe (404) is communicated with the feed end of the purifier (5).

5. The device for preparing high-purity ammonium chloride by utilizing waste heat to evaporate low-concentration ammonia water according to claim 4, characterized in that: The purifier (5) comprises a housing (501), wherein a centrifugal chamber (502) and a drying chamber (503) are provided inside the housing (501), wherein one side of the discharge end of the centrifugal chamber (502) is communicated with the drying chamber (503), a centrifuge is provided in the centrifugal chamber (502), and the other side of the discharge end of the centrifugal chamber (502) is connected to the centrifuge, and the discharge end of the centrifuge is communicated with the drying chamber (503) via a pipeline.

6. The device for preparing high-purity ammonium chloride by utilizing waste heat to evaporate low-concentration ammonia water according to claim 5, characterized in that: The centrifuge comprises a rotor, a centrifugal cylinder, a filter, a two-stage piston pushing mechanism, a hydraulic cylinder, a main motor, and a pushing device. The main motor is used to drive the rotor and the centrifugal cylinder. The filter is detachably mounted in the centrifugal cylinder. The pushing device is arranged in the filter. The pushing device is connected to the hydraulic cylinder. The discharge end of the centrifugal cylinder is in communication with the drying chamber (503).

7. The device for preparing high-purity ammonium chloride by utilizing waste heat to evaporate low-concentration ammonia water according to claim 6, characterized in that: The drying chamber (503) includes a material chamber (504), a drying chamber (505), and a heat preservation chamber (506); a material inlet and a material outlet are provided in the material chamber (504); the material inlet is connected to the discharge end of the centrifuge via a pipeline; the material outlet is connected to a precipitation pipe; the drying chamber (505) is provided outside the material chamber (504); and the heat preservation chamber (506) is provided between the drying chamber (505) and the inner wall of the drying chamber (503); The drying chamber (505) is connected to the water outlet of the hot water tank (109) via a water delivery pipe (110). A drain port is provided on one side of the bottom end of the drying chamber (505). The drain port is connected to a drain pipe, and a drain valve is provided on the drain pipe. The heat preservation chamber (506) is communicated with the second air outlet pipe (108) on the waste heat recovery tank (1). The heat preservation chamber (506) is also provided with a pressure reducing port, and the pressure reducing port is connected to a pressure reducing pipe, and a pressure reducing valve is provided on the pressure reducing pipe. A second pressure sensor is provided at the pressure reducing port.

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