Device for evaporating liquid ammonia through steam condensate water

Abstract

The utility model relates to the technical field of phosphoric acid production equipment, in particular to a device for evaporating liquid ammonia through steam condensate, which comprises an ammonia evaporator, a hot water tank connected to the upper part of one end of the ammonia evaporator through a pipeline, a hot water inlet pipe connected to the top of the hot water tank, and a cold water tank connected to the bottom of one end of the ammonia evaporator through a pipeline. One side of the cold water tank is connected with a cold water outlet pipe which is provided with a cold water pump. According to the device for evaporating the liquid ammonia through the steam condensate water, the liquid ammonia is evaporated through the heat energy of the high-temperature condensate water generated in the dihydrate wet-process phosphoric acid production, so that the steam consumption is greatly reduced, the energy consumption and the cost are reduced, and meanwhile, the heat pollution to the environment is also reduced. In addition, the heat exchange process is optimized through the design of the device, efficient heat energy transfer and utilization are achieved through the structures such as the U-shaped shell-and-tube heat exchanger, and the energy use efficiency is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of phosphoric acid production equipment, in particular to a device for evaporating liquid ammonia through steam condensation water. Background Art

[0002] In the production process of compound fertilizers, gaseous ammonia is widely used as an important raw material. Traditionally, gaseous ammonia is mainly obtained by heating liquid ammonia to evaporate it, and this process usually requires a large amount of steam to provide heat. However, this method has two significant problems: first, the latent heat of vaporization of liquid ammonia is large, and the evaporation process requires a large amount of steam, which not only increases energy consumption but also increases production costs; second, during the evaporation process, due to the large temperature difference, the ammonia evaporator is prone to internal leakage, which poses a considerable challenge to the stable operation of the production line.

[0003] At the same time, in the production of dihydrate wet-process phosphoric acid, a large amount of steam condensate is generated, which usually has a high temperature (about 96°C). However, in the traditional production process, this high-temperature condensate is often only recycled as desalted water after cooling through circulating water, and its heat energy is not effectively utilized, which is undoubtedly a waste of energy. Utility Model Content

[0004] The purpose of the utility model is to provide a device for evaporating liquid ammonia through steam condensed water, so as to solve the problem raised in the above background technology that in traditional production processes, these high-temperature condensed waters are often only recycled and used as desalted water after being cooled by circulating water, and their thermal energy is not effectively utilized, which is undoubtedly a waste of energy.

[0005] To achieve the above-mentioned purpose, the utility model provides a device for evaporating liquid ammonia by condensing steam water, comprising an ammonia evaporator, wherein the upper portion of one end of the ammonia evaporator is connected to a hot water tank through a pipeline, the top of the hot water tank is connected to a hot water inlet pipe, the bottom of one end of the ammonia evaporator is connected to a cold water tank through a pipeline, one side of the cold water tank is connected to a cold water outlet pipe, a cold water pump is installed on the cold water outlet pipe, the top of the ammonia evaporator is connected to an ammonia gas outlet pipe, and the bottom of the ammonia evaporator is connected to a liquid ammonia inlet pipe.

[0006] Preferably, a hot water inlet valve is installed on the hot water inlet pipe, a conductivity sensor is installed on the hot water inlet valve, and a pressure sensor is also installed inside the ammonia evaporator.

[0007] Preferably, a discharge pipe is vertically installed at the bottom of the hot water inlet pipe.

[0008] Preferably, a hot water pump is installed on the pipeline between the ammonia evaporator and the hot water tank, and valves are installed at the input end and the output end of the hot water pump.

[0009] Preferably, a water storage tank is provided at one end inside the ammonia evaporator, a water inlet is provided at the top of the water storage tank, a water outlet is provided at the bottom of the water storage tank, the water inlet is connected to the output pipeline of the hot water tank, and the water outlet is connected to the input pipeline of the cold water tank.

[0010] Preferably, a plurality of U-shaped tube-in-tube heat exchangers are arranged inside the ammonia evaporator. The U-shaped tube-in-tube heat exchangers are U-shaped structures and are arranged vertically and parallelly with equal spacing.

[0011] Preferably, a gas outlet is provided at the top of the ammonia evaporator, and a gas inlet is provided at the bottom of the ammonia evaporator. The top of the gas outlet is connected to the ammonia gas outlet pipe, and the bottom of the gas inlet is connected to the liquid ammonia inlet pipe. Valves are installed on the ammonia gas outlet pipe and the liquid ammonia inlet pipe.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] In the device for evaporating liquid ammonia through steam condensed water, the heat energy of high-temperature condensed water generated in the production of dihydrate wet phosphoric acid is used to evaporate liquid ammonia, which not only greatly reduces the consumption of steam, thereby reducing energy consumption and costs, but also reduces thermal pollution to the environment. In addition, the design of the device also optimizes the heat exchange process, and through structures such as U-shaped shell and tube heat exchangers, it realizes efficient heat energy transfer and utilization, further improving energy efficiency. Importantly, this device reduces the temperature difference in the ammonia evaporator and effectively reduces the risk of internal leakage of the equipment, thereby ensuring the stable operation of the production line. Overall, the device solves the problems of high energy consumption and high equipment failure rate in the traditional liquid ammonia evaporation process through innovative technical means, bringing significant economic and environmental benefits to the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the internal structure of the ammonia evaporator in the utility model;

[0016] Figure 3 It is a structural schematic diagram of the U-shaped shell and tube heat exchanger in the utility model.

[0017] The meaning of each number in the figure is:

[0018] 1. Ammonia evaporator; 11. Ammonia outlet pipe; 12. Liquid ammonia inlet pipe; 13. U-type shell and tube heat exchanger; 14. Water storage tank; 141. Water inlet; 142. Water outlet; 15. Air outlet; 16. Air inlet; 17. Pressure sensor; 2. Hot water tank; 21. Hot water inlet pipe; 22. Hot water inlet valve; 23. Conductivity sensor; 3. Cold water tank; 31. Cold water outlet pipe; 4. Hot water pump; 5. Cold water pump. 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] The utility model provides a device for evaporating liquid ammonia through steam condensation water, such as Figure 1-Figure 3 As shown, it includes an ammonia evaporator 1, the upper part of one end of the ammonia evaporator 1 is connected to a hot water tank 2 through a pipeline for hot water storage, the top of the hot water tank 2 is connected to a hot water inlet pipe 21, the bottom of one end of the ammonia evaporator 1 is connected to a cold water tank 3 through a pipeline for cold water storage, one side of the cold water tank 3 is connected to a cold water outlet pipe 31, and a cold water pump 5 is installed on the cold water outlet pipe 31, the top of the ammonia evaporator 1 is connected to an ammonia outlet pipe 11 for ammonia discharge, and the bottom of the ammonia evaporator 1 is connected to a liquid ammonia inlet pipe 12 for ammonia entry.

[0021] In this embodiment, a hot water inlet valve 22 is installed on the hot water inlet pipe 21, and a conductivity sensor 23 is installed on the hot water inlet valve 22 for measuring conductivity. A pressure sensor 17 is also installed inside the ammonia evaporator 1 for measuring the internal pressure of the ammonia evaporator 1.

[0022] Specifically, a discharge pipe is vertically installed at the bottom of the hot water inlet pipe 21, which is opened when the conductivity is high to discharge the water out.

[0023] Furthermore, a hot water pump 4 is installed on the pipeline between the ammonia evaporator 1 and the hot water tank 2, and valves are installed at the input end and the output end of the hot water pump 4 to facilitate the transportation of hot water.

[0024] Furthermore, a water storage tank 14 is provided at one end inside the ammonia evaporator 1, a water inlet 141 is provided at the top of the water storage tank 14, a water outlet 142 is provided at the bottom of the water storage tank 14, the water inlet 141 is connected to the output pipeline of the hot water tank 2, and the water outlet 142 is connected to the input pipeline of the cold water tank 3.

[0025] Furthermore, a plurality of U-shaped tube-in-tube heat exchangers 13 are arranged inside the ammonia evaporator 1. The U-shaped tube-in-tube heat exchangers 13 are U-shaped structures and are arranged vertically and parallelly with equal spacing.

[0026] Furthermore, an air outlet 15 is provided at the top of the ammonia evaporator 1, and an air inlet 16 is provided at the bottom of the ammonia evaporator 1. The top of the air outlet 15 is connected to the ammonia outlet pipe 11, and the bottom of the air inlet 16 is connected to the liquid ammonia inlet pipe 12. Valves are installed on the ammonia outlet pipe 11 and the liquid ammonia inlet pipe 12.

[0027] When the device for evaporating liquid ammonia through steam condensed water of the utility model is used, first, the hot condensed water generated in the phosphoric acid concentration process enters the hot water tank 2 through the hot water inlet pipe 21 for storage. In this process, the hot water inlet valve 22 controls the entry of the condensed water, and the conductivity sensor 23 monitors the conductivity of the condensed water in real time to ensure that the water quality meets the use requirements. When the conductivity is high, the hot water inlet valve 22 is controlled to be cut off, and the discharge pipe is opened to discharge the water.

[0028] When liquid ammonia needs to be evaporated, the hot water pump 4 is started, and the valves at its input and output ends are opened to pump the hot condensed water in the hot water tank 2 into the water storage tank 14 in the ammonia evaporator 1. The water storage tank 14 receives hot water through the water inlet 141 at the top thereof, and introduces the water flow into the U-shaped tube heat exchanger 13 through the water outlet 142 at the bottom.

[0029] The U-shaped tube heat exchanger 13 is arranged in parallel with each other in the ammonia evaporator 1 in a U-shaped structure to maximize the heat exchange efficiency. Liquid ammonia enters the ammonia evaporator 1 through the air inlet 16 and the liquid ammonia inlet pipe 12, flows around the U-shaped tube heat exchanger 13 and evaporates under heat.

[0030] The evaporated ammonia gas rises and is discharged through the gas outlet 15 and the ammonia outlet pipe 11 to enter the subsequent process or storage. The unevaporated liquid ammonia continues to circulate into the ammonia evaporator 1 through the gas inlet 16.

[0031] During this process, the pressure sensor 17 inside the ammonia evaporator 1 continuously monitors the internal pressure to ensure safe operation.

[0032] When the heat energy in the hot water is fully utilized, the condensed water with reduced temperature flows out through the water outlet 142 of the water storage bin 14 and enters the cold water tank 3 through the pipeline for storage. Subsequently, the cold water can be discharged through the cold water outlet pipe 31 and the cold water pump 5 for other uses.

[0033] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A device for evaporating liquid ammonia by condensing water with steam, comprising an ammonia evaporator (1), characterized in that: The upper part of one end of the ammonia evaporator (1) is connected to a hot water tank (2) through a pipeline, and the top of the hot water tank (2) is connected to a hot water inlet pipe (21). The bottom of one end of the ammonia evaporator (1) is connected to a cold water tank (3) through a pipeline, and one side of the cold water tank (3) is connected to a cold water outlet pipe (31), and a cold water pump (5) is installed on the cold water outlet pipe (31). The top of the ammonia evaporator (1) is connected to an ammonia gas outlet pipe (11), and the bottom of the ammonia evaporator (1) is connected to a liquid ammonia inlet pipe (12).

2. The device for evaporating liquid ammonia by condensing steam according to claim 1, characterized in that: A hot water inlet valve (22) is installed on the hot water inlet pipe (21), a conductivity sensor (23) is installed on the hot water inlet valve (22), and a pressure sensor (17) is also installed inside the ammonia evaporator (1).

3. The device for evaporating liquid ammonia by condensing steam according to claim 2, characterized in that: A discharge pipe is also vertically installed at the bottom of the hot water inlet pipe (21).

4. The device for evaporating liquid ammonia by condensing steam according to claim 1, characterized in that: A hot water pump (4) is installed on the pipeline between the ammonia evaporator (1) and the hot water tank (2), and valves are installed at the input end and the output end of the hot water pump (4).

5. The device for evaporating liquid ammonia by condensing steam according to claim 1, characterized in that: A water storage tank (14) is provided at one end of the interior of the ammonia evaporator (1), a water inlet (141) is provided at the top of the water storage tank (14), and a water outlet (142) is provided at the bottom of the water storage tank (14), the water inlet (141) is connected to the output pipeline of the hot water tank (2), and the water outlet (142) is connected to the input pipeline of the cold water tank (3).

6. The device for evaporating liquid ammonia by condensing steam according to claim 5, characterized in that: A plurality of U-shaped tube-in-tube heat exchangers (13) are arranged inside the ammonia evaporator (1). The U-shaped tube-in-tube heat exchangers (13) are of a U-shaped structure and are arranged in parallel and at equal intervals up and down.

7. The device for evaporating liquid ammonia by condensing steam according to claim 5, characterized in that: The top of the ammonia evaporator (1) is provided with an air outlet (15), and the bottom of the ammonia evaporator (1) is provided with an air inlet (16). The top of the air outlet (15) is connected to the ammonia outlet pipe (11), and the bottom of the air inlet (16) is connected to the liquid ammonia inlet pipe (12). Valves are installed on the ammonia outlet pipe (11) and the liquid ammonia inlet pipe (12).

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