Ammonia water low-temperature evaporation and absorption equipment

Abstract

The utility model relates to the technical field of ammonia water low-temperature evaporation and absorption equipment, in particular to ammonia water low-temperature evaporation and absorption equipment. Comprising an air energy heating system and a negative pressure evaporation tank, the negative pressure evaporation tank is sequentially connected with a tubular condenser, a condensation collecting tank, a jet device, an ammonia gas negative pressure generation and absorption device and a sub-liquid blending tank, the air energy heating system heats liquid in the negative pressure evaporation tank, and the negative pressure evaporation tank is externally connected with an ammonia water inlet pump; the air energy heating system is used for heating ammonia water in the negative pressure evaporation tank, and ammonia gas and water vapor in the negative pressure evaporation tank are pumped into the tubular condenser for heat exchange and condensation; ammonia gas and water are separated in the condensation collection tank, a large amount of ammonia gas enters the ammonia gas negative pressure generation and absorption device to react with the sub-liquid, and the ammonia gas is completely absorbed, so that the effect of ammonia water evaporation and concentration is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of ammonia water low-temperature evaporation and absorption equipment, and specifically to an ammonia water low-temperature evaporation and absorption equipment. Background Technology

[0002] Liquid ammonia is a liquefied ammonia gas, a colorless and toxic gas with a pungent odor. It is highly soluble in water, and its aqueous solution is alkaline and easily liquefied. Liquid ammonia is generally used as a refrigerant, but contact with it can cause severe frostbite. The explosive limits of ammonia are 15.7%–27.4%. Under appropriate pressure, ammonia gas liquefies into liquid ammonia, which is typically stored in cylinders or tanks. Necessary fire prevention measures must be taken during storage, transportation, and use to prevent leaks and explosions. Ammonia can form explosive mixtures with air or oxygen, and its storage containers are also highly susceptible to explosion when heated. Ammonia can attack moist skin, mucous membranes, and eyes, causing severe coughing, bronchospasm, acute pulmonary edema, and even blindness and death from suffocation. Currently, the use of liquid ammonia is subject to strict requirements regarding area, site, space, and facilities, which are often unacceptable. Therefore, many companies use water-based ammonia as a substitute for liquid ammonia. Because of the low concentration of ammonia water, ammonia gas is not completely released, resulting in low utilization efficiency. Ammonia water with concentrations below a certain level cannot be used and must be discharged as waste, causing significant environmental pollution, greatly increasing operating costs for enterprises, and resulting in a huge waste of resources. Therefore, there is a need for a low-temperature evaporation and absorption device for ammonia water to evaporate and release ammonia gas, increase utilization rate, directly reduce the discharge of low-concentration ammonia water, lower enterprise operating costs, and save on the consumption of non-renewable resources.

[0003] Existing ammonia water treatment technologies cannot achieve evaporation, concentration, and recycling due to the strong corrosiveness, volatility, and toxicity of ammonia gas, resulting in a significant waste of resources. Innovation and breakthroughs are needed to develop technologies that can reuse ammonia water through low-temperature evaporation. Utility Model Content

[0004] The purpose of this invention is to provide a low-temperature evaporation and absorption device for ammonia water, which addresses the shortcomings of existing ammonia water treatment equipment, such as the inability to perform evaporation, concentration, and recycling.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution.

[0006] A low-temperature evaporation and absorption device for ammonia includes an air-source heating system and a negative pressure evaporator. The negative pressure evaporator is sequentially connected to a tube condenser, a condensation collection tank, an ejector, an ammonia negative pressure generating and absorbing device, and a liquid mixing tank. The air-source heating system heats the liquid inside the negative pressure evaporator, and an ammonia inlet pump is connected to the outside of the negative pressure evaporator.

[0007] Furthermore, the air source heating system includes an air source heating system cabinet, a compressor, and a spiral heat exchange coil. The compressor is installed inside the air source heating system cabinet, and the spiral heat exchange coil is located inside a negative pressure evaporator. The compressor is connected to the spiral heat exchange coil. This effectively accelerates water vapor evaporation.

[0008] Furthermore, the air source heating system cabinet, negative pressure evaporator, condensate collection tank, ejector, ammonia negative pressure generating and absorbing device, and sub-liquid mixing tank are all connected to a PLC central control system, enabling integrated and unified control.

[0009] Furthermore, the negative pressure evaporator is connected to an external wastewater discharge pump for discharging waste liquid.

[0010] Furthermore, the tube condenser is externally connected to a water cooler, which is connected to a PLC central control system to control the water circulation.

[0011] Furthermore, the ammonia negative pressure generating and absorbing device is connected to a jet circulation pump, which in turn is connected to an ejector. This enables the recycling of the sub-liquid, achieving energy-saving effects.

[0012] Furthermore, the aforementioned tube-and-shell condenser has a tubular structure, including an inner cavity and an outer cavity. The inner cavity is connected to a negative pressure evaporator and a condensate collection tank, respectively, while the outer cavity is connected to the inlet and outlet of a water cooler. It has high thermal conductivity, does not corrode in ammonia water, and has a long service life.

[0013] The beneficial effects of this utility model are as follows: Ammonia water is drawn into the negative pressure evaporator through the inlet of the negative pressure tank; the ammonia water in the negative pressure evaporator is heated by an air-source heating system, and after reaching the set target temperature, the ammonia negative pressure generating and absorbing device starts to work, and at the same time, the circulating pump of the water cooler starts to work. The ammonia gas and water vapor in the negative pressure evaporator are drawn into the tube condenser for "convection" heat exchange, and the cold water in the water cooler is used to condense the ammonia gas and water vapor; a distilled water condensation and collection device is connected in series between the ammonia negative pressure generating and absorbing device and the negative pressure evaporator, and the ammonia negative pressure generating and absorbing device forms a negative pressure evaporator inside the negative pressure evaporator. The negative pressure lowers the boiling point of ammonia water, accelerating the volatilization of ammonia gas. Simultaneously, the cooled and condensed ammonia gas and distilled water are condensed in a tube condenser, and then separated in a condensation collection tank. Water and some ammonia gas are condensed and converted into water, which is stored in the condensation collection tank. A large amount of ammonia gas enters the ammonia negative pressure absorption device to react with the ammonia solution, achieving complete absorption and concentration of the ammonia water. After concentration in the negative pressure evaporator, the ammonia water is sampled and tested, and then discharged through the drain outlet of the negative pressure evaporator using a drain pump. Meanwhile, the ammonia-absorbing ammonia solution can be used as a specific chemical raw material in a solution mixing tank. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the operation process of this utility model.

[0016] Labels and explanations:

[0017] Air source heating system cabinet 1; compressor 2; negative pressure evaporator 3; spiral heat exchange coil 4; pressure sensor 5; negative pressure tank level sensor 6; temperature sensor 7; pressure relief safety valve 8; negative pressure tank inlet valve 9; negative pressure tank drain valve 9a; water cooler flow regulating valve 9b; first pressure control check valve 9c; condensate collection tank drain valve 9d; second pressure control check valve 9e; negative pressure pump inlet regulating valve 9f; drain valve 9g; ammonia negative pressure generating and absorbing device sub-liquid replenishment valve 9h; sub-liquid mixing tank sub-liquid replenishment valve 9j; water cooler 10; tube condenser 11; condensate collection tank 12; condensate collection tank level sensor 13; jet circulation pump 14; jet injector 15; ammonia negative pressure generating and absorbing device 16; sub-liquid mixing tank 17; PLC central control system 18; ammonia water inlet pump 19; wastewater drain pump 20; skid-mounted frame base 21. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] See Figure 1 —— Figure 2 This utility model discloses a low-temperature ammonia evaporation and absorption device installed on a skid-mounted frame base 21. It includes an air source heating system cabinet 1 and a negative pressure evaporator 3. A compressor 2 is installed inside the air source heating system cabinet 1 and connected to the negative pressure evaporator 3. The skid-mounted frame base 21 adopts a frame structure, with the skeleton seamlessly welded from stainless steel square tubing. It is fully sealed, has high load-bearing strength, and is corrosion- and dustproof.

[0020] The negative pressure evaporator 3 of this invention is manufactured using standard mold opening and is integrally formed. The reactor has high compressive strength, good heat insulation, and strong corrosion resistance. The negative pressure evaporator 3 has a spiral heat exchange coil 4 inside, which is connected to the compressor 2. The negative pressure evaporator 3 is connected to a pressure sensor 5, a negative pressure tank level sensor 6, a temperature sensor 7, and a pressure relief safety valve 8. The negative pressure evaporator 3 is connected to an ammonia water inlet pump 19 through a negative pressure tank inlet valve 9; the negative pressure evaporator 3 is connected to a wastewater discharge pump 20 through a negative pressure tank drain valve 9a.

[0021] This utility model comprises an air source heating system consisting of an air source heating system cabinet 1, a compressor 2, and a spiral heat exchange coil 4. The main heat source generator heats the ammonia water in the negative pressure evaporator 3.

[0022] The negative pressure evaporator 3 of this invention is connected to the tube condenser 11 via a pipe. The upper end of the tube condenser 11 is connected to the input end of the water cooler 10 via a water cooler flow regulating valve 9b and a pipe, and the output end of the water cooler 10 is connected to the lower end of the tube condenser 11.

[0023] The water cooler 10 of this utility model is a specially designed closed cooling tower with packing, circulating pump fan and spray system, which has the function of dissipating heat for circulating cooling water.

[0024] The shell-and-tube condenser 11 of this invention is welded from multiple stainless steel heat pipes and a stainless steel shell, and serves as the condensation site for the water in the water cooler and the ammonia gas evaporated in the negative pressure evaporator tank 3. The shell-and-tube condenser 11 has a tubular structure; the circulating water in the water cooler 10 moves from bottom to top in the outer cavity of the shell-and-tube condenser 11, while the ammonia gas moves from top to bottom in the inner cavity of the stainless steel heat exchange tubes. The shell-and-tube condenser 11 has a vertical structure design and is equipped with an ammonia gas inlet and outlet (top inlet, bottom outlet) and a cold water inlet and outlet (bottom inlet, top outlet).

[0025] The shell-and-tube condenser 11 of this invention is connected to a condensate collection tank 12 via a first pressure-controlled check valve 9c and a pipeline. The condensate collection tank 12 is equipped with a condensate collection tank level sensor 13. The condensate collection tank 12 is also connected to a condensate collection tank drain valve 9d.

[0026] The condensation collection tank 12 of this invention is connected to an ammonia negative pressure generating and absorbing device 16, forming a low-temperature negative pressure evaporation of ammonia water. After condensation, the ammonia gas and water vapor are separated, achieving the purpose of ammonia absorption. The condensation collection tank 12 is connected to an ejector 15 via a second pressure-controlled one-way valve 9e, and the ejector 15 is connected to the ammonia negative pressure generating and absorbing device 16. The ammonia negative pressure generating and absorbing device 16 is connected to a jet circulation pump 14 via a negative pressure pump inlet regulating valve 9f, and one end of the jet circulation pump 14 is connected to the ejector 15. The ammonia negative pressure generating and absorbing device 16 is connected to a drain valve 9g. The ammonia negative pressure generating and absorbing device 16 is connected to a sub-liquid mixing tank 17 via a sub-liquid replenishment valve 9h, and the sub-liquid mixing tank 17 is connected to a sub-liquid replenishment valve 9j.

[0027] The condensate collection tank 12 of this invention is a water-gas separator used to buffer water vapor, separate water and ammonia, collect condensate, and return it to the negative pressure evaporator 3 when a certain amount is stored. The condensate collection tank 12 is made of stainless steel and is connected in series between the tube condenser 11 and the ammonia negative pressure generating and absorbing device 16 via a pipeline.

[0028] The ammonia negative pressure generating and absorbing device 16 of this utility model has two functions: 1. to remove water vapor and ammonia generated by the heating and vaporization of ammonia and water in the negative pressure evaporator 3; 2. to maintain a negative pressure state in the negative pressure evaporator 3, reduce the vaporization temperature of water in the original liquid in the reaction vessel, expand the range of low-temperature evaporation of ammonia water, and generate a large amount of ammonia gas to be absorbed by the sub-liquid between 25 and 60°C, thereby realizing the evaporation and concentration of ammonia water and the absorption of ammonia gas.

[0029] The air source heating system cabinet 1, negative pressure evaporator 3, water cooler 10, condensate collection tank 12, jet circulation pump 14, ammonia negative pressure generating and absorbing device 16, and sub-liquid mixing tank 17 of this utility model are all connected to PLC central control system 18 and are controlled by PLC central control system 18.

[0030] The PLC central control system 18 is composed of integrated circuit modules and a human-machine interactive touch screen. It is intelligent and highly stable. Its functions are: 1. to control the normal start and stop of each system; 2. to detect the real-time operating status of the equipment, and to automatically collect various data and take corresponding actions.

[0031] Electrical energy is converted into mechanical energy by a compressor. The compressed refrigerant generates heat energy, which heats the ammonia water to produce water vapor. The ammonia and water vapor are cooled and release heat energy, turning into liquid water in the condenser collection tank 12 and being discharged. The ammonia gas is absorbed by the sub-liquid in the ammonia negative pressure absorption device 16, and the saturated sub-liquid is discharged. The water cooler 10 provides cold water to the shell and tube condenser 11 for heat exchange.

[0032] The features of this utility model are:

[0033] 1. It adopts an air source heat pump heating system, which is environmentally friendly and energy-saving, with an energy consumption ratio of 3:1 (compared to electric heating).

[0034] 2. The equipment has good corrosion resistance. All parts that come into contact with ammonia water, ammonia gas, or water vapor are made of non-metallic or ammonia-resistant materials.

[0035] 3. The process route of the ammonia water low-temperature evaporation equipment is: ammonia water → water vapor → ammonia gas (absorbed by the liquid), water (liquid) returns to the negative pressure tank, there is no leakage of fluoride-containing water vapor, and it is safe and reliable;

[0036] 4. The negative pressure evaporator adopts a new type of imported PPH material, using standard mold opening and integrated molding technology. The negative pressure evaporator has high compressive strength and good heat preservation effect. It is equipped with an internal defoaming net to effectively break up bubbles generated during the evaporation of fluorine-containing waste liquid. It uses physical principles to puncture bubbles generated by heated or stirred boiling liquid within a small diameter range, preventing overflow. The defoaming net is made of PPH material.

[0037] 5. It adopts a shell and tube heat exchanger, equipped with stainless steel heat exchange tubes and shell. Steam flows inside the shell and tube heat exchanger and cooling circulating water flows outside. It has high thermal conductivity, does not corrode in ammonia water, and has a long service life.

[0038] 6. The spiral heat exchange coil heating mode, when using the compressor to compress Freon medium for heating, the heat exchanger does not scale or clog; it has a large heat exchange area and high efficiency, and at the same time, it atomizes and stirs the waste liquid in the negative pressure evaporator, accelerating water vapor evaporation.

[0039] 7. Condensation collection tank, used to buffer water vapor, separate moisture and ammonia, collect condensate, and return it to the negative pressure evaporator when a certain amount is stored. The condensation collection tank is made of stainless steel and is connected in series between the tube condenser and the ammonia negative pressure generating and absorbing device through a pipeline.

[0040] 8. The negative pressure generating device adopts a Venturi jet injector and uses a pressure pump to drive the circulating sub-liquid to generate a vacuum. It has low power consumption, high pumping speed, and all flow parts are made of PPH material, which is corrosion-resistant and temperature-resistant. The jet pumping device has high reliability and energy saving.

[0041] 9. The equipment is integrated into a systematic design, using a single skid-mounted frame base to integrate multiple modular processing systems. This makes installation and operation simple, reduces the equipment size by half, and maximizes the utilization of internal space.

[0042] Of course, the above-described embodiments are merely preferred examples of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this utility model should be included within the scope of the claims of this utility model.

Claims

1. An ammonia water low-temperature evaporation absorption apparatus characterized by comprising: The air energy heating system, the negative pressure evaporation tank, the negative pressure evaporation tank is connected in turn to the pipe condenser, the condensation collection tank, the jet device, the ammonia gas negative pressure generation absorption device and the sub-liquid distribution tank, the air energy heating system heats the liquid in the negative pressure evaporation tank, and the negative pressure evaporation tank is connected with an ammonia water inlet pump.

2. An ammonia water low-temperature evaporation absorption apparatus according to claim 1, characterized by: The air energy heating system comprises an air source heating system cabinet, a compressor and a spiral heat exchange coil, the compressor is installed in the air source heating system cabinet, the spiral heat exchange coil is arranged in the negative pressure evaporation tank, and the compressor is connected with the spiral heat exchange coil.

3. An ammonia water low-temperature evaporation absorption apparatus according to claim 2, characterized by: The air source heating system cabinet, the negative pressure evaporation tank, the condensation collection tank, the jet device, the ammonia gas negative pressure generation absorption device and the sub-liquid distribution tank are connected with a PLC central control system.

4. The ammonia water low-temperature evaporation absorption apparatus according to claim 1, characterized by: The negative pressure evaporation tank is connected with a waste water discharge pump.

5. An ammonia water low-temperature evaporation absorption apparatus according to claim 3, characterized by: The pipe condenser is connected with a water cooler, and the water cooler is connected with the PLC central control system.

6. An ammonia water low-temperature evaporation absorption apparatus according to claim 1, characterized by: The ammonia gas negative pressure generation absorption device is connected with a jet circulating pump, and the jet circulating pump is connected with the jet device.

7. An ammonia water low-temperature evaporation absorption apparatus according to claim 5, characterized by: The pipe condenser is a pipe structure and comprises an inner cavity and an outer cavity, the inner cavity is connected with the negative pressure evaporation tank and the condensation collection tank, and the outer cavity is connected with the input end and the output end of the water cooler.

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