Ammonia water rectifying tower device

Abstract

The utility model discloses an ammonia water rectifying tower device and relates to the technical field of rectifying towers. Comprising a tower body, the lower surface of the tower body is communicated with a liquid inlet of a reboiler through a liquid outlet pipe, the reboiler is communicated with the tower body through a return pipe, a fractional condenser is fixedly installed at the position, close to the upper side, of the inner wall of the tower body, an ammonia water inlet pipe is fixedly installed on the right side face of the fractional condenser, and an ammonia water outlet pipe is fixedly installed on the left side face of the fractional condenser. The ammonia water outlet pipe is communicated with the first liquid distribution mechanism; the first liquid distribution mechanism is mounted on the inner wall of the tower body close to the middle part; the reflux quantity of the ammonia absorption refrigeration high-pressure rectifying tower is adjusted according to the load change, the purity of tower top rectified liquid ammonia can be ensured and the refrigeration effect of low-temperature methanol washing can be met in a self-reflux and return flow dual-adjustment mode, and meanwhile, the low-temperature ammonia gas in the liquid storage tank cools the gas outlet guide pipe and circularly cools the ammonia gas, so that the energy consumption is reduced, and the production efficiency is improved. The ammonia gas condensation efficiency and effect are improved, and use is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of distillation towers, in particular to an ammonia distillation tower device. Background Art

[0002] If the huge reserves of low-grade heat sources can be effectively utilized, it will be of great significance to solving the energy crisis. The ammonia absorption refrigeration cycle is a typical heat-driven refrigeration cycle, which can achieve the heating and quality improvement of low-grade heat sources. However, the boiling points of ammonia and water are close, and the steam produced by directly heating the ammonia solution has a high water content, and the concentration of the gas phase ammonia component needs to be further increased through distillation. The distillation tower is the key heat and mass exchange equipment in the ammonia absorption refrigeration system, and the improvement of its heat and mass transfer effect is of significant significance to the system performance and equipment size optimization.

[0003] The distillation tower is mainly composed of four parts: the fractional condenser, the distillation section, the stripping section and the generating section. The concentrated solution enters the middle of the distillation tower, and flows from top to bottom through the stripping section under the action of gravity to the bottom of the distillation tower and the heating tube for heat exchange to produce steam and dilute solution. The dilute solution flows out from the bottom of the distillation tower, and the generated steam continues to rise to the fractional condenser at the top of the distillation tower. After the steam in the fractional condenser is condensed by cooling water, the gas phase is ammonia vapor with extremely high purity, and the liquid phase is a saturated ammonia solution with a high ammonia component content. The ammonia vapor flows out from the top of the distillation tower, and the remaining liquid ammonia in the fractional condenser flows downward, and is ultrasonically atomized into micron-level droplets, which contact and exchange heat and mass with the ascending ammonia vapor to achieve the purpose of distillation.

[0004] In the prior art, during the use of a conventional ammonia distillation tower, a high-pressure distillation tower for ammonia absorption refrigeration is used. The reflux in the tower uses the concentrated ammonia water entering the distillation tower to exchange heat with the high-purity ammonia gas at the top of the tower using the partial condenser at the top of the tower. Part of the ammonia gas is condensed as reflux in the tower. The advantage of this process is that the thermal efficiency is high and it is suitable for use in winter. In summer, due to the high system circulating water temperature and high air temperature, the temperature of the concentrated ammonia water entering the tower is high, resulting in a small amount of reflux at the top of the tower, and it cannot be adjusted. The top of the tower is overheated, the purity of the liquid ammonia product at the top of the tower is low, and the refrigeration effect is poor. At the same time, in the use project, the condensed ammonia water has a large amount of low-temperature gas, and the flow rate of these low-temperature gases causes a waste of resources. Utility Model Content

[0005] The utility model provides an ammonia water distillation tower device to solve the problems in the background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an ammonia distillation tower device, comprising a tower body, wherein the lower surface of the tower body is connected to the liquid inlet of a reboiler through a liquid outlet pipe, the reboiler is connected to the tower body through a reflux pipe, a partial condenser is fixedly installed on the inner wall of the tower body near the upper side, an ammonia water inlet pipe is fixedly installed on the right side of the partial condenser, an ammonia water outlet pipe is fixedly installed on the left side of the partial condenser, the ammonia water outlet pipe is connected to a first liquid distribution mechanism, and the first liquid distribution mechanism is installed on the inner wall of the tower body near the middle position, An air outlet duct is fixedly installed on the upper surface of the tower body, and the air outlet duct is connected with the air inlet of the condenser. The water outlet of the condenser is connected with the liquid storage tank through a connecting pipe. The liquid storage tank is connected with the second liquid distribution mechanism through a first extraction mechanism. The second liquid distribution mechanism is installed on the inner wall of the tower body and is located at the lower side of the partial condenser. A second extraction mechanism is installed on the upper surface of the liquid storage tank, and the second extraction mechanism is connected with a cooling mechanism. The cooling mechanism is installed on the outer surface of the air outlet duct, and the cooling mechanism is connected with the air outlet duct close to the condenser.

[0007] Furthermore, the first liquid distribution mechanism includes a liquid distribution pipe and a nozzle. The liquid distribution pipe is fixedly installed between the left and right inner walls of the tower body, and the nozzles are evenly installed on the lower surface of the liquid distribution pipe.

[0008] Furthermore, the second liquid distribution mechanism has the same structure as the first liquid distribution mechanism.

[0009] Furthermore, the first extraction mechanism includes a pumping component, an electric flow control valve, a first check valve, an ammonia concentration sensor and a controller. The pumping component connects the liquid storage tank with the second liquid distribution mechanism. The electric flow control valve and the first check valve are installed on the pumping component in sequence. The ammonia concentration sensor is installed on the left side wall of the tower body, and the ammonia concentration sensor is electrically connected to the controller.

[0010] Furthermore, the second extraction mechanism includes a waterproof breathable valve and an exhaust assembly, the waterproof breathable valve is installed on the upper side wall of the liquid storage tank, and the waterproof breathable valve is connected to the air inlet of the cooling mechanism through the exhaust assembly.

[0011] Furthermore, the cooling mechanism includes a jacket, a spoiler, a branch pipe and a second check valve. The exhaust assembly connects the liquid storage tank with the jacket. The jacket is fixedly installed on the outer surface of the air outlet duct. A spoiler is fixedly installed on the inner wall of the jacket. The lower air outlet of the jacket is connected to the air outlet duct close to the condenser through a branch pipe, and a second check valve is fixedly installed on the branch pipe.

[0012] Compared with the prior art, the utility model provides an ammonia water distillation tower device, which has the following beneficial effects:

[0013] 1. The ammonia distillation tower device is provided with a partial condenser to condense the incoming ammonia water by heat exchange, and then the ammonia water in the liquid storage tank is extracted into the tower body through the first extraction mechanism and the second liquid distribution mechanism. According to the change of load, the reflux amount of the ammonia absorption refrigeration high-pressure distillation tower is adjusted. The reflux amount of the distillation tower is adjusted to 5-13m through the dual adjustment mode of self-reflux and return flow. 3 , control the outlet temperature of the gas at the top of the tower to be reduced from 60℃ to 40-48℃, so as to reduce the gas phase temperature at the top of the distillation tower and increase the purity of the liquid ammonia product from 98% to 99%. Especially in the summer when the ambient temperature is high and the system circulating water temperature is high, the adjustable reflux can ensure the purity of the liquid ammonia at the top of the tower and meet the low-temperature methanol washing refrigeration effect.

[0014] 2. The ammonia distillation tower device is provided with a second extraction mechanism to draw the low-temperature ammonia gas in the liquid storage tank into the cooling mechanism. The cooling mechanism cools the gas outlet duct and circulates the ammonia gas for cooling and use, thereby improving the efficiency and effect of ammonia condensation, saving resources, and facilitating use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a cross-sectional view of the tower body of the utility model;

[0017] Figure 3 This is a schematic diagram of a control system of the present utility model.

[0018] In the figure: 1. tower body; 2. reboiler; 3. reflux pipe; 4. condenser; 5. ammonia water inlet pipe; 6. ammonia water outlet pipe; 7. first liquid distribution mechanism; 701. liquid distribution pipe; 702. nozzle; 8. air outlet duct; 9. condenser; 10. connecting pipe; 11. liquid storage tank; 12. first extraction mechanism; 121. pumping assembly; 122. electric flow control valve; 123. first check valve; 124. ammonia concentration sensor; 125. controller; 13. second liquid distribution mechanism; 14. second extraction mechanism; 141. waterproof breathable valve; 142. exhaust assembly; 15. cooling mechanism; 151. jacket; 152. spoiler; 153. branch pipe; 154. second check valve. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1-Figure 3 The utility model discloses an ammonia distillation tower device, comprising a tower body 1, wherein the lower surface of the tower body 1 is connected to the liquid inlet of a reboiler 2 through a liquid outlet pipe, and the reboiler 2 is connected to the tower body 1 through a reflux pipe 3, and a partial condenser 4 is fixedly installed near the upper side of the inner wall of the tower body 1, an ammonia water inlet pipe 5 is fixedly installed on the right side of the partial condenser 4, and an ammonia water outlet pipe 6 is fixedly installed on the left side of the partial condenser 4, and the ammonia water outlet pipe 6 is connected to a first liquid distribution mechanism 7, and the first liquid distribution mechanism 7 is installed near the middle of the inner wall of the tower body 1, and a gas outlet is fixedly installed on the upper surface of the tower body 1. duct 8, the air outlet duct 8 is connected with the air inlet of the condenser 9, the water outlet of the condenser 9 is connected with the liquid storage tank 11 through the connecting pipe 10, the liquid storage tank 11 is connected with the second liquid distribution mechanism 13 through the first extraction mechanism 12, the second liquid distribution mechanism 13 is installed on the inner wall of the tower body 1 and is located at the lower side of the partial condenser 4, the upper surface of the liquid storage tank 11 is installed with a second extraction mechanism 14, the second extraction mechanism 14 is connected with a cooling mechanism 15, the cooling mechanism 15 is installed on the outer surface of the air outlet duct 8, and the cooling mechanism 15 is connected with the air outlet duct 8 close to the condenser 9.

[0021] Specifically, the first liquid distribution mechanism 7 includes a liquid distribution pipe 701 and a nozzle 702 . The liquid distribution pipe 701 is fixedly installed between the left and right inner walls of the tower body 1 . The nozzles 702 are evenly installed on the lower surface of the liquid distribution pipe 701 .

[0022] In this embodiment, the liquid distribution pipe 701 receives the ammonia water for heat exchange and distributes the ammonia water evenly in the tower body 1 through the nozzle 702 .

[0023] Specifically, the second liquid distributing mechanism 13 has the same structure as the first liquid distributing mechanism 7 .

[0024] In this embodiment, the second liquid distribution mechanism 13 makes the extracted ammonia water evenly distributed in the tower body 1 .

[0025] Specifically, the first extraction mechanism 12 includes a pumping component 121, an electric flow control valve 122, a first check valve 123, an ammonia concentration sensor 124 and a controller 125. The pumping component 121 connects the liquid storage tank 11 with the second liquid distribution mechanism 13. The electric flow control valve 122 and the first check valve 123 are installed on the pumping component 121 in sequence. The ammonia concentration sensor 124 is installed on the left side wall of the tower body 1, and the ammonia concentration sensor 124 is electrically connected to the controller 125.

[0026] In this embodiment, the ammonia concentration sensor 124 detects the ammonia concentration in the tower body 1. When the ammonia concentration in the tower body 1 is low, the information is fed back to the controller 125. The controller 125 enables the pumping component 121 to pump the ammonia in the liquid storage tank 11 into the second liquid distribution mechanism 13. The ammonia flow rate can be adjusted by the electric flow control valve 122.

[0027] Specifically, the second extraction mechanism 14 includes a waterproof breathable valve 141 and an exhaust assembly 142 . The waterproof breathable valve 141 is installed on the upper side wall of the liquid storage tank 11 . The waterproof breathable valve 141 is connected to the air inlet of the cooling mechanism 15 through the exhaust assembly 142 .

[0028] In this embodiment, the second extraction mechanism 14 can extract the low-temperature ammonia gas in the liquid storage tank 11 into the temperature reduction mechanism 15 .

[0029] Specifically, the cooling mechanism 15 includes a jacket 151, a spoiler 152, a branch pipe 153 and a second check valve 154. The exhaust assembly 142 connects the liquid storage tank 11 with the jacket 151. The jacket 151 is fixedly installed on the outer surface of the air outlet duct 8. The spoiler 152 is fixedly installed on the inner wall of the jacket 151. The lower air outlet of the jacket 151 is connected to the air outlet duct 8 close to the condenser 9 through the branch pipe 153. The second check valve 154 is fixedly installed on the branch pipe 153.

[0030] In this embodiment, the low-temperature ammonia gas in the jacket 151 exchanges heat with the high-temperature ammonia gas in the outlet duct 8, and the spoiler 152 extends the path of the low-temperature ammonia gas to achieve the effect of safely cooling the outlet duct 8. The ammonia gas in the jacket 151 flows back into the connecting pipe 10 through the branch pipe 153, and the second check valve 154 prevents the ammonia gas from flowing back.

[0031] When in use, external ammonia water enters the partial condenser 4 through the ammonia water inlet pipe 5, condenses the high-temperature ammonia gas in the tower body 1, preheats the ammonia gas, and allows the ammonia gas to enter the first liquid distribution mechanism 7, receives the heat-exchanged ammonia water through the liquid distribution pipe 701, and evenly distributes the ammonia water in the tower body 1 through the nozzle 702. The ammonia water is heated to generate steam, which flows into the gas outlet conduit 8. The gas in the gas outlet conduit 8 allows the gas to enter the condenser 9, and then flows into the liquid storage tank 11 after condensation by the condenser 9, and then flows into the liquid storage tank 11 through the first pump. The ammonia concentration sensor 124 in the extraction mechanism 12 detects the ammonia concentration in the tower body 1. When the ammonia concentration in the tower body 1 is low, the information is fed back to the controller 125. The controller 125 causes the pumping component 121 to pump the ammonia in the liquid storage tank 11 into the second liquid distribution mechanism 13, and sprays it into the tower body 1 through the second liquid distribution mechanism 13. According to the change of load, the reflux amount of the ammonia absorption refrigeration high-pressure distillation tower is adjusted. The reflux amount of the distillation tower is adjusted to 5-13m through the dual adjustment method of self-reflux and return flow. 3, the outlet temperature of the gas at the top of the tower is controlled to be reduced from 60°C to 40-48°C, so as to reduce the gas phase temperature at the top of the distillation tower and improve the purity of the product liquid ammonia from 98% to 99%. Especially in summer when the ambient temperature is high and the circulating water temperature of the system is high, the purity of the liquid ammonia in the top distillation tower can be guaranteed through the adjustable reflux, and the refrigeration effect of low-temperature methanol washing can be met. The low-temperature ammonia in the liquid storage tank 11 can be drawn into the cooling mechanism 15 through the second extraction mechanism 14, and the low-temperature ammonia in the jacket 151 exchanges heat with the high-temperature ammonia in the outlet pipe 8. The spoiler 152 extends the route of the low-temperature ammonia to achieve the effect of safely cooling the outlet pipe 8. The ammonia in the jacket 151 flows back into the connecting pipe 10 through the branch pipe 153, and the low-temperature ammonia in the liquid storage tank 11 is circulated and cooled for use, thereby improving the efficiency and effect of ammonia condensation, saving resources, and being convenient for use.

[0032] In summary, the ammonia water distillation tower device adjusts the reflux volume of the ammonia absorption refrigeration high-pressure distillation tower according to the change of load, and adjusts the reflux volume of the distillation tower to 5-13m 3 , the outlet temperature of the gas at the top of the tower is controlled to be reduced from 60°C to 40-48°C, so as to reduce the gas phase temperature at the top of the distillation tower and increase the purity of the product liquid ammonia from 98% to 99%. Especially in summer when the ambient temperature is high and the system circulating water temperature is high, the purity of the liquid ammonia at the top of the tower can be guaranteed through adjustable reflux, and the refrigeration effect of low-temperature methanol washing can be met. At the same time, the low-temperature ammonia gas in the liquid storage tank 11 cools the outlet pipe 8, circulates and cools the ammonia, improves the efficiency and effect of ammonia condensation, and is convenient for use.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ammonia distillation tower device, comprising a tower body (1), characterized in that: The lower surface of the tower body (1) is connected to the liquid inlet of the reboiler (2) through a liquid outlet pipe, and the reboiler (2) is connected to the tower body (1) through a reflux pipe (3). A condenser (4) is fixedly installed on the inner wall of the tower body (1) near the upper side, an ammonia water inlet pipe (5) is fixedly installed on the right side of the condenser (4), and an ammonia water outlet pipe (6) is fixedly installed on the left side of the condenser (4). The ammonia water outlet pipe (6) is connected to a first liquid distribution mechanism (7), and the first liquid distribution mechanism (7) is installed near the middle of the inner wall of the tower body (1). An air outlet conduit (8) is fixedly installed on the upper surface of the tower body (1), and the air outlet conduit (8) is connected to the cooling air outlet. The air inlet of the condenser (9) is connected, the water outlet of the condenser (9) is connected to the liquid storage tank (11) through a connecting pipe (10), the liquid storage tank (11) is connected to the second liquid distribution mechanism (13) through a first extraction mechanism (12), the second liquid distribution mechanism (13) is installed on the inner wall of the tower body (1) and is located at the lower side of the partial condenser (4), the upper surface of the liquid storage tank (11) is installed with a second extraction mechanism (14), the second extraction mechanism (14) is connected to a cooling mechanism (15), the cooling mechanism (15) is installed on the outer surface of the air outlet duct (8), and the cooling mechanism (15) is connected to the air outlet duct (8) close to the condenser (9).

2. An ammonia distillation tower device according to claim 1, characterized in that: The first liquid distribution mechanism (7) comprises a liquid distribution pipe (701) and a nozzle (702); the liquid distribution pipe (701) is fixedly installed between the left and right inner walls of the tower body (1); and the nozzles (702) are evenly installed on the lower surface of the liquid distribution pipe (701).

3. An ammonia distillation tower device according to claim 1, characterized in that: The second liquid distributing mechanism (13) has the same structure as the first liquid distributing mechanism (7).

4. The ammonia distillation tower device according to claim 1, characterized in that: The first extraction mechanism (12) comprises a pumping assembly (121), an electric flow control valve (122), a first check valve (123), an ammonia concentration sensor (124) and a controller (125); the pumping assembly (121) connects the liquid storage tank (11) with the second liquid distribution mechanism (13); the pumping assembly (121) is sequentially mounted with the electric flow control valve (122) and the first check valve (123); the ammonia concentration sensor (124) is mounted on the left side wall of the tower body (1); and the ammonia concentration sensor (124) is electrically connected to the controller (125).

5. The ammonia distillation tower device according to claim 1, characterized in that: The second extraction mechanism (14) comprises a waterproof breathable valve (141) and an exhaust assembly (142); the waterproof breathable valve (141) is mounted on the upper side wall of the liquid storage tank (11); and the waterproof breathable valve (141) is connected to the air inlet of the cooling mechanism (15) via the exhaust assembly (142).

6. An ammonia distillation tower device according to claim 5, characterized in that: The cooling mechanism (15) comprises a jacket (151), a spoiler (152), a branch pipe (153) and a second check valve (154); the exhaust assembly (142) connects the liquid storage tank (11) with the jacket (151); the jacket (151) is fixedly mounted on the outer surface of the air outlet conduit (8); the spoiler (152) is fixedly mounted on the inner wall of the jacket (151); the lower air outlet of the jacket (151) is connected to the air outlet conduit (8) close to the condenser (9) through the branch pipe (153); and the second check valve (154) is fixedly mounted on the branch pipe (153).

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