Concentrated ammonia water loading ammonia gas recovery device and method

Abstract

The invention relates to a concentrated ammonia water loading ammonia gas recovery device and method, and belongs to the technical field of ammonia gas recovery. The ammonia gas recovery device for concentrated ammonia water loading comprises an ammonia gas main pipe, a first branch pipe, a second branch pipe, a third branch pipe, an ammonia gas absorption tank, an ammonia gas absorption pipe, a hydraulic pump, an ammonia water recovery tank, an ammonia water storage unit and an ammonia water conveying pipe, the first branch pipe, the second branch pipe and the third branch pipe are independently arranged and are respectively connected with the gas outlet end of the ammonia gas main pipe. By ingeniously designing pipelines and valves and combining reasonable operation steps, not only can the air pressure in the stronger ammonia water conveying tank car be controlled within 0-3 KPa in the stronger ammonia water loading process be ensured, but also the loading flow of stronger ammonia water can reach 12-14 t / h, the stronger ammonia water loading efficiency is ensured, meanwhile, ammonia gas can be prevented from escaping from the device, the ammonia gas recovery efficiency is high, and the method is suitable for industrial production. And the safety of a loading site is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of ammonia recovery, and in particular to an ammonia recovery device and method for loading concentrated ammonia water onto a truck. Background Art

[0002] During the process of loading concentrated ammonia water (mass concentration of 20-25%), the concentrated ammonia water in the ammonia water storage tank is filled into the concentrated ammonia water delivery tank truck through a delivery pump. As the filling amount increases, the amount of ammonia volatilization increases, which directly causes the air pressure in the concentrated ammonia water delivery tank truck to gradually increase. In order to ensure the safety of the concentrated ammonia water filling process, it is necessary to discharge the gas in the concentrated ammonia water delivery tank truck. Since the gas in the concentrated ammonia water delivery tank truck contains a large amount of non-condensable gases such as ammonia and air, if it is directly vented, it is easy to pollute the environment and cause unnecessary waste of resources. Therefore, the prior art generally transports non-condensable gas to the ammonia absorption device through natural ventilation, using a fan or an ammonia machine, etc.

[0003] However, in the process of natural ventilation to ammonia absorption, it is inevitable that the safety valve on the roof of the concentrated ammonia water transport tank truck will trip, causing the toxic gas (ammonia) to be directly discharged, which seriously threatens the safety and environmental protection on site. The loading efficiency of concentrated ammonia water is low, and it is even impossible to load in hot weather. Using a fan or an ammonia machine to extract ammonia from the roof of the concentrated ammonia water transport tank truck to the ammonia absorption device will not affect the loading efficiency of concentrated ammonia water, and will not cause the roof safety valve to trip and cause ammonia leakage, but it requires the laying of motor cables, which not only occupies a large area and has high costs, but the mechanical rotation of the fan will increase the risk of ammonia explosion.

[0004] Therefore, it is very necessary to provide an ammonia recovery device for concentrated ammonia water loading, so as to improve the ammonia recovery efficiency without affecting the efficiency and safety of concentrated ammonia water loading. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an ammonia recovery device and method for loading concentrated ammonia water onto a truck.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] In a first aspect, the present invention provides an ammonia recovery device for loading concentrated ammonia water, comprising an ammonia main pipe, a first branch pipe, a second branch pipe, a third branch pipe, an ammonia absorption tank, an ammonia absorption pipe, a hydraulic pump, an ammonia recovery tank, an ammonia storage unit and an ammonia delivery pipe; the first branch pipe, the second branch pipe and the third branch pipe are independently arranged and respectively connected to the gas outlet end of the ammonia main pipe;

[0008] The first branch pipe is connected to the air inlet of the ammonia absorption tank, the top flow port of the ammonia absorption tank is connected to the bottom flow port of the ammonia absorption pipe through a connecting pipe, the upper water inlet of the ammonia absorption pipe is connected to the first demineralized water pipe, and the ammonia water outlet of the ammonia absorption tank is connected to the tank inlet pipe of the ammonia water recovery tank through the first ammonia water recovery pipe;

[0009] The air outlet end of the second branch pipe is connected to the air inlet of the hydraulic pump, and the water inlet of the hydraulic pump is connected to the second demineralized water pipe; the outlet of the hydraulic pump is connected to the tank inlet pipe of the ammonia recovery tank through the second ammonia recovery pipe; the air outlet of the ammonia recovery tank is connected to the bottom flow port of the ammonia absorption pipe through a pipeline;

[0010] The third branch pipe is connected to an ammonia water storage unit, and the ammonia water storage unit is used to store concentrated ammonia water. The ammonia water outlet end of the ammonia water storage unit is connected to an ammonia water delivery pipe, and the ammonia water delivery pipe is provided with a first ammonia water pump.

[0011] In the present invention, valves are provided on each pipe, the air inlet end of the ammonia main pipe is used to connect with the top air outlet of the concentrated ammonia water delivery tank truck, and the outlet end of the ammonia water delivery pipe is used to connect with the top ammonia water inlet of the concentrated ammonia water delivery tank truck. The device provided by the present invention can improve the ammonia recovery efficiency without affecting the efficiency and safety of concentrated ammonia water loading.

[0012] During loading, the concentrated ammonia water in the ammonia water storage unit is transported to the tank truck through the ammonia water delivery pipe by the first ammonia water pump; the ammonia gas volatilized and discharged from the tank truck flows through the ammonia main pipe and can be divided into three paths: one path enters the ammonia absorption tank through the first branch pipe and is absorbed by the desalted water in the ammonia absorption tank; one path flows through the second branch pipe under the action of the hydraulic pump, and the ammonia and desalted water are mixed by the hydraulic pump to quickly dissolve the ammonia in the desalted water; one path enters the ammonia water storage unit through the third branch pipe to be reabsorbed by the concentrated ammonia water. Some ammonia gas still volatilizes and escapes in the ammonia absorption tank and the ammonia water recovery tank. The escaped ammonia gas enters the ammonia absorption pipe through the pipeline and contacts the desalted water in reverse to ensure that all the ammonia gas is recovered, thereby avoiding the ammonia gas escape device and increasing the safety risk of loading.

[0013] As a preferred embodiment of the invention, the ammonia main pipe is provided with a first valve and a second valve in sequence along the gas flow direction.

[0014] Furthermore, the first valve is arranged at the air inlet end of the ammonia main pipe, and the ammonia main pipe between the first valve and the second valve is a hose structure, which is convenient for operators to connect the ammonia main pipe with the air outlet on the top of the concentrated ammonia water transport tank truck.

[0015] As a preferred embodiment of the present invention, a third valve is provided on the first branch pipe.

[0016] As a preferred embodiment of the present invention, a first flow regulating valve is provided on the first desalted water pipe to regulate the flow of the desalted water entering the ammonia absorption pipe.

[0017] As a preferred embodiment of the present invention, a fourth valve and a first pressure sensor are provided on the second branch pipe; a fifth valve is provided on the second deionized water pipe; and a sixth valve is provided on the second ammonia water recovery pipe.

[0018] As a preferred embodiment of the present invention, the water inlet of the ammonia absorption tank is connected to a third demineralized water pipe, and the third demineralized water pipe is provided with a seventh valve, a second flow regulating valve and a check valve.

[0019] As a preferred embodiment of the present invention, an air outlet is provided on the top of the ammonia water recovery tank, and the air outlet of the ammonia water recovery tank passes through an ammonia reflux pipe and a bottom flow port of the ammonia absorption pipe, so that ammonia gas generated by volatilization of ammonia water in the ammonia water recovery tank can be discharged into the ammonia absorption pipe in time and redissolved in the desalted water.

[0020] As a preferred embodiment of the present invention, an eighth valve is provided on the third branch pipe.

[0021] As a preferred embodiment of the present invention, the ammonia water delivery pipe is provided with a first ammonia water pump, a ninth valve, a flow meter, a tenth valve and an eleventh valve in sequence along the flow direction of the ammonia water.

[0022] Furthermore, the eleventh valve is arranged at the outlet end of the ammonia delivery pipe, and the ammonia delivery pipe between the tenth valve and the eleventh valve is a hose structure, which is convenient for operators to connect the ammonia delivery pipe with the ammonia inlet on the top of the concentrated ammonia delivery tank truck when preparing for loading.

[0023] The ammonia water storage unit includes at least two ammonia water storage tanks arranged in parallel, and the ammonia water storage tanks are equipped with second pressure sensors to monitor the gas pressure in the ammonia water storage tanks in real time.

[0024] In a second aspect, the present invention provides a method for recovering ammonia gas from a concentrated ammonia solution loaded onto a truck, which is implemented by the device for recovering ammonia gas from a concentrated ammonia solution loaded onto a truck as described in the first aspect, and comprises the following steps:

[0025] S1. Preparation for loading: connect the air inlet end of the ammonia main pipe to the top air outlet of the concentrated ammonia water delivery tank truck, and connect the inlet end of the ammonia water delivery pipe to the top ammonia water inlet of the concentrated ammonia water delivery tank truck to complete the preparation for loading;

[0026] S2, loading implementation: open the valves on each pipe, start the hydraulic pump, use the hydraulic pump to mix the volatilized ammonia gas and demineralized water in the concentrated ammonia water delivery tank car and input them into the ammonia water recovery tank, start the first ammonia water pump, and use the first ammonia water pump to input the concentrated ammonia water in the ammonia water storage unit into the concentrated ammonia water delivery tank car;

[0027] S3. After loading is completed, close the first ammonia water pump, hydraulic pump and valves on each pipe, and remove the ammonia main pipe and ammonia water delivery pipe from the concentrated ammonia water delivery tank truck.

[0028] As a preferred embodiment of the present invention, step S1 specifically includes:

[0029] S11, after the concentrated ammonia water delivery tank truck is parked, the air inlet end of the ammonia main pipe 1 is connected to the top air outlet of the concentrated ammonia water delivery tank truck, and the inlet end of the ammonia water delivery pipe is connected to the top ammonia water inlet of the concentrated ammonia water delivery tank truck;

[0030] S12, opening the second valve and the eighth valve, so that the ammonia gas retained in the ammonia main pipe and the third branch pipe is discharged into the ammonia water storage tank for absorption and dissolution, and the air pressure in the ammonia water storage tank is monitored in real time by the second pressure sensor;

[0031] S13, opening the first flow regulating valve to allow the demineralized water to flow into the ammonia absorption pipe and the ammonia absorption tank in sequence at a flow rate of 1 to 3 t / h;

[0032] The sixth valve, the fourth valve and the fifth valve are opened in sequence, and the hydraulic pump is started, so that the demineralized water flows through the fifth valve, the hydraulic pump and the sixth valve in sequence at a flow rate of 1 to 3 t / h and then enters the ammonia recovery tank, and the air pressure in the second branch pipe is monitored in real time by the first pressure sensor;

[0033] S14, after the air pressure in the second branch pipe is 0-3 KPa and the air pressure in the ammonia water storage tank is 0-3 KPa, open the first valve and monitor the air pressure in the concentrated ammonia water delivery tank truck through the pressure sensor equipped in the concentrated ammonia water delivery tank truck;

[0034] S15. After the air pressure in the concentrated ammonia water transport tanker is balanced to 0-3KPa, open the eleventh valve and the tenth valve, and the loading preparation work is completed.

[0035] As a preferred embodiment of the present invention, step S2 specifically includes:

[0036] S21, start the first ammonia water pump, adjust the opening of each valve on the ammonia water delivery pipe, so that the concentrated ammonia water is discharged from the bottom of the ammonia water storage tank and flows into the concentrated ammonia water delivery tank truck, and control the concentrated ammonia water outlet flow rate of the first ammonia water pump at 3-5 t / h;

[0037] Slowly adjust the opening of the fifth valve to adjust the water flow rate of the hydraulic pump to 2-4 t / h, so that the air pressure in the second branch pipe is maintained at -2-6 KPa;

[0038] S22. Adjust the opening of each valve on the ammonia delivery pipe so that the concentrated ammonia can be input into the concentrated ammonia delivery tank truck at a flow rate of 10 to 14 t / h, and the air pressure in the ammonia storage tank is maintained at -2 to 6 KPa until the required amount of ammonia is loaded.

[0039] As a preferred embodiment of the present invention, during the loading process in step S2, the ammonia water in the ammonia water recovery tank is pumped to the ammonia water preparation device by a first ammonia water pump, and the liquid level in the ammonia water recovery tank is controlled at 20-80%.

[0040] As a preferred embodiment of the present invention, step S3 specifically includes:

[0041] S31, close the first ammonia water pump and the ninth valve, and close the tenth valve after 1 to 3 minutes;

[0042] S32, close the eleventh valve and the ammonia inlet valve of the concentrated ammonia tank truck in sequence, and adjust the water inlet flow of the hydraulic pump to maintain the air pressure in the second branch pipe at -2 to 6 KPa;

[0043] S33, closing the ammonia outlet valve and the first valve of the concentrated ammonia water delivery tank truck in sequence, and removing the ammonia main pipe and the ammonia water delivery pipe from the concentrated ammonia water delivery tank truck;

[0044] S34, close the fourth valve, the fifth valve, the sixth valve and the eighth valve in sequence; close the first flow regulating valve and the second flow regulating valve.

[0045] Ammonia is recovered during the ammonia loading process by the device provided by the first aspect of the present invention. During the loading process, the loading flow rate of concentrated ammonia water can reach 12-14 t / h. While ensuring the loading efficiency of concentrated ammonia water, ammonia escape from the device can be avoided. The ammonia recovery efficiency is high, and the safety of the loading site is guaranteed.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] (1) The present invention utilizes a first ammonia pump to transport the concentrated ammonia water in the ammonia water storage unit to the tank truck through an ammonia water delivery pipe; the ammonia volatilized and discharged from the tank truck flows through the ammonia main pipe and can be divided into three paths: one path enters the ammonia absorption tank through the first branch pipe and is absorbed by the desalted water in the ammonia absorption tank; one path flows through the second branch pipe under the action of a hydraulic pump, and the ammonia and desalted water are converged and mixed by the hydraulic pump, so that the ammonia is quickly dissolved in the desalted water; one path enters the ammonia water storage unit through the third branch pipe to be reabsorbed by the concentrated ammonia water. Some ammonia still evaporates and escapes from the ammonia absorption tank and the ammonia recovery tank. The escaped ammonia enters the ammonia absorption pipe through a pipeline and contacts the desalted water in reverse, ensuring that all the ammonia is recovered, thereby avoiding the ammonia escape device and increasing the safety risk of loading;

[0048] (2) The present invention, through the ingenious design of pipelines and valves and the combination of reasonable operating steps, can ensure that the air pressure in the concentrated ammonia water conveying tank is controlled within 0-3KPa during the concentrated ammonia water loading process, and can also increase the loading flow rate of the concentrated ammonia water to 12-14t / h. While ensuring the concentrated ammonia water loading efficiency, it can also avoid ammonia gas escaping from the device, and the ammonia gas recovery efficiency is high, thereby ensuring the safety of the loading site. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a schematic diagram of the structure of the ammonia recovery device for loading concentrated ammonia water.

[0050] In the figure, 1-ammonia main pipe, 2-first branch pipe, 3-second branch pipe, 4-third branch pipe, 5-ammonia absorption tank, 6-ammonia absorption pipe, 7-hydraulic pump, 8-ammonia recovery tank, 9-first valve, 10-second valve, 11-third valve, 12-first desalted water pipe, 13-first flow regulating valve, 14-fourth valve, 15-second desalted water pipe, 16-fifth valve, 17-sixth valve, 18-third desalted water pipe, 19-seventh valve, 20-second flow regulating valve, 21-first ammonia pump, 22-eighth valve, 23-second ammonia pump, 24-ninth valve, 25-flow meter, 26-tenth valve, 27-eleventh valve, 28-ammonia storage tank, 29-liquid level detection instrument, 30-first pressure sensor, 31-second pressure sensor, 32-ammonia delivery pipe. DETAILED DESCRIPTION

[0051] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0052] Unless otherwise specified, the materials and reagents used in the examples can be obtained from commercial sources.

[0053] Example 1

[0054] This embodiment provides an ammonia recovery device for loading concentrated ammonia water onto a truck, and the results are as follows: Figure 1 shown.

[0055] The concentrated ammonia water loading ammonia recovery device comprises an ammonia main pipe 1, a first branch pipe 2, a second branch pipe 3, a third branch pipe 4, an ammonia absorption tank 5, an ammonia absorption pipe 6, a hydraulic pump 7, an ammonia water recovery tank 8 and an ammonia water storage unit.

[0056] The air inlet end of the ammonia main pipe 1 is used to connect with the top air outlet of the concentrated ammonia water delivery tank truck. The ammonia main pipe 1 is provided with a first valve 9 and a second valve 10 in sequence along the air flow direction. The first valve 9 is provided at the air inlet end of the ammonia main pipe 1. The ammonia main pipe 1 between the first valve 9 and the second valve 10 is a hose structure, which is convenient for operators to connect the ammonia main pipe 1 with the air outlet on the top of the concentrated ammonia water delivery tank truck.

[0057] The first branch pipe 2 , the second branch pipe 3 and the third branch pipe 4 are independently arranged and respectively connected to the gas outlet end of the ammonia main pipe 1 .

[0058] A third valve 11 is provided on the first branch pipe 2, the first branch pipe 2 is connected to the air inlet of the ammonia absorption tank 5, the top flow port of the ammonia absorption tank 5 is connected to the bottom flow port of the ammonia absorption pipe 6 through a connecting pipe, the upper water inlet of the ammonia absorption pipe 6 is connected to the first desalted water pipe 12, the first desalted water pipe 12 is provided with a first flow regulating valve 13, the ammonia water discharge outlet of the ammonia absorption tank 5 is connected to the tank inlet pipe of the ammonia water recovery tank 8 through the first ammonia water recovery pipe. After the ammonia is passed into the ammonia absorption tank 5, most of it is dissolved in water, and a small amount of ammonia that escapes or evaporates continues to rise and enters the ammonia absorption pipe 6, in which the ammonia and desalted water are convective, and the ammonia and desalted water are fully in contact so that all the ammonia is absorbed; the water inlet of the ammonia absorption tank 5 is located above the air inlet of the ammonia absorption tank 5, and the ammonia water outlet of the ammonia absorption tank 5 is located between the water inlet of the ammonia absorption tank 5 and the air inlet of the ammonia absorption tank 5, which helps to discharge the ammonia water in the ammonia absorption tank 5 in time and avoid the ammonia water level in the ammonia absorption tank 5 being too high.

[0059] The second branch pipe 3 is provided with a fourth valve 14 and a first pressure sensor 30, the air outlet end of the second branch pipe 3 is connected to the air inlet of the hydraulic pump 7, the water inlet of the hydraulic pump 7 is connected to the second desalted water pipe 15, the second desalted water pipe 15 is provided with a fifth valve 16, the outlet of the hydraulic pump 7 is connected to the tank inlet pipe of the ammonia water recovery tank 8 through the second ammonia water recovery pipe, and the second ammonia water recovery pipe is provided with a sixth valve 17. The unabsorbed gas in the second ammonia water recovery pipe contacts the inlet pipe of the ammonia water recovery tank 8 and the unsaturated ammonia water overflowing from the ammonia absorption tank 5 in reverse. The inlet pipe of the ammonia water recovery tank 8 extends downward to the lower part of the ammonia water recovery tank 8 so that the recovered ammonia water can pass into the lower part of the ammonia water recovery tank 8 to avoid splashing of ammonia water and accelerate the volatilization of ammonia water. An air outlet is provided on the top of the ammonia water recovery tank 8. The air outlet of the ammonia water recovery tank 8 passes through the ammonia reflux pipe and the bottom flow port of the ammonia absorption pipe 6 so that the ammonia gas generated by the volatilization of ammonia water in the ammonia water recovery tank 8 can be discharged into the ammonia absorption pipe 6 in time and redissolved in the desalted water.

[0060] The water inlet of the ammonia absorption tank 5 is connected to a third demineralized water pipe 18 , and the third demineralized water pipe 18 is provided with a seventh valve 19 , a second flow regulating valve 20 and a check valve.

[0061] The third branch pipe 4 is provided with an eighth valve 22, and the third branch pipe 4 is connected to an ammonia water storage unit, and the ammonia water storage unit is used to store concentrated ammonia water. The ammonia water outlet of the ammonia water storage unit is connected to an ammonia water delivery pipe 32, and the outlet end of the ammonia water delivery pipe 32 is used to be connected to the ammonia water inlet on the top of the concentrated ammonia water delivery tank truck; the ammonia water delivery pipe 32 is provided with a first ammonia water pump 21, a ninth valve 24, a flow meter 25, a tenth valve 26 and an eleventh valve 27 in sequence along the flow direction of the ammonia water. The eleventh valve 27 is provided at the outlet end of the ammonia water delivery pipe 32, and the ammonia water delivery pipe 32 between the tenth valve 26 and the eleventh valve 27 is a hose structure, which is convenient for the operator to connect the ammonia water delivery pipe 32 with the ammonia water inlet on the top of the concentrated ammonia water delivery tank truck when preparing for loading.

[0062] The ammonia water storage unit includes at least two ammonia water storage tanks 28 arranged in parallel. The ammonia water storage tanks 28 are equipped with second pressure sensors 31 to monitor the gas pressure in the ammonia water storage tanks 28 in real time.

[0063] The ammonia absorption tank 5, the ammonia water recovery tank 8, and the ammonia water storage tank 28 are all equipped with a liquid level detection instrument 29. During the ammonia recovery process, the liquid level in each tank can be detected by the liquid level detection instrument 29.

[0064] In this embodiment, the first demineralized water pipe 12, the third demineralized water pipe 18 and the second demineralized water pipe 15 are respectively connected to the demineralized water tank; a pressure sensor and a breathing valve are provided on the top of the concentrated ammonia water transport tank truck.

[0065] In this embodiment, the ammonia water recovery tank 8 is connected to a second ammonia water pump 23 via a pipeline, and the second ammonia water pump 23 is connected to a device for preparing ammonia water via a pipeline, so as to recycle the recovered ammonia water.

[0066] In this embodiment, the concentrated ammonia water transport tank truck is provided with an ammonia outlet valve at the ammonia outlet and an ammonia water inlet valve at the ammonia water inlet.

[0067] Example 2

[0068] This embodiment provides a method for recovering ammonia gas by loading concentrated ammonia water into a truck, which is implemented by the ammonia gas recovery device for loading concentrated ammonia water into a truck provided in Example 1, and includes the following steps:

[0069] S1. Loading preparation:

[0070] S11, after the concentrated ammonia water delivery tank truck is parked, the air inlet end of the ammonia main pipe 1 is connected to the top air outlet of the concentrated ammonia water delivery tank truck, and the inlet end of the ammonia water delivery pipe 32 is connected to the top ammonia water inlet of the concentrated ammonia water delivery tank truck;

[0071] S12, opening the second valve 10 and the eighth valve 22, so that the ammonia gas retained in the ammonia main pipe 1 and the third branch pipe 4 is discharged into the ammonia water storage tank 28 for absorption and dissolution, and the air pressure in the ammonia water storage tank 28 is monitored in real time by the second pressure sensor 31;

[0072] S13, opening the first flow regulating valve 13, allowing the demineralized water to flow into the ammonia absorption pipe 6 and the ammonia absorption tank 5 in sequence at a flow rate of 1 to 3 t / h;

[0073] The sixth valve 17, the fourth valve 14 and the fifth valve 16 are opened in sequence, and the hydraulic pump 7 is started, so that the demineralized water flows through the fifth valve 16, the hydraulic pump 7 and the sixth valve 17 in sequence at a flow rate of 1-3 t / h and then enters the ammonia recovery tank 8, and the air pressure in the second branch pipe 3 is monitored in real time by the first pressure sensor 30;

[0074] S14, after the air pressure in the second branch pipe 3 is 0-3KPa, the first valve 9 is opened, and the air pressure in the concentrated ammonia water transport tank truck is monitored by the pressure sensor equipped in the concentrated ammonia water transport tank truck;

[0075] S15, after the air pressure in the concentrated ammonia water delivery tanker is balanced to 0-3 KPa, the eleventh valve 27 and the tenth valve 26 are opened, and the loading preparation work is completed.

[0076] S2. Loading implementation:

[0077] S21, start the first ammonia water pump 21, adjust the opening of each valve on the ammonia water delivery pipe 32, so that the concentrated ammonia water is discharged from the bottom of the ammonia water storage tank 28 and flows into the concentrated ammonia water delivery tank truck, and control the concentrated ammonia water outlet flow rate of the first ammonia water pump 21 to 3-5 t / h;

[0078] While performing step S21, perform the following steps:

[0079] Slowly adjust the opening of the fifth valve 16 to adjust the water flow rate of the hydraulic pump 7 to 2-4 t / h, so that the air pressure in the second branch pipe 3 is maintained at -2-6 KPa;

[0080] S22. Adjust the opening of each valve on the ammonia water delivery pipe 32 so that the concentrated ammonia water is input into the concentrated ammonia water delivery tank truck at a flow rate of 10 to 14 t / h, and the gas pressure in the ammonia water storage tank 28 is maintained at -2 to 6 KPa until the required amount of ammonia water is loaded.

[0081] During the loading process of step S2, the ammonia water in the ammonia water recovery tank 8 is pumped to the ammonia water preparation device by the first ammonia water pump 23, and the liquid level in the ammonia water recovery tank 8 is controlled at 20-80%.

[0082] S3, loading and finishing

[0083] S31, close the first ammonia water pump 21 and the ninth valve 24, and close the tenth valve 26 after 1 to 3 minutes;

[0084] S32, closing the eleventh valve 27 and the ammonia inlet valve of the concentrated ammonia tank truck in sequence, adjusting the water inlet flow of the hydraulic pump 7, so that the air pressure in the second branch pipe 3 is maintained at -2 to 6 KPa;

[0085] S33, closing the ammonia outlet valve and the first valve 9 of the concentrated ammonia water delivery tank truck in sequence, and removing the ammonia main pipe 1 and the ammonia water delivery pipe 32 from the concentrated ammonia water delivery tank truck;

[0086] S34 , close the fourth valve 14 , the fifth valve 16 , the sixth valve 17 and the eighth valve 22 in sequence; close the first flow regulating valve 13 and the second flow regulating valve 20 .

[0087] In the present embodiment, in steps S1, S2 and S3, no odorous gas is discharged from the top of the ammonia absorption pipe 6, that is, no ammonia escapes from the ammonia absorption pipe 6. This shows that the present invention can ensure that the air pressure in the concentrated ammonia water delivery tank car is controlled within 0-3KPa (within the working pressure protection range of the breathing valve on the roof of the concentrated ammonia water delivery tank car) during the concentrated ammonia water loading process, and can also ensure the loading efficiency, and the loading flow rate of concentrated ammonia water can reach 12-14t / h; and when the concentrated ammonia water loading flow rate is 12-14t / h, the ammonia escape device can be avoided, the ammonia recovery efficiency is high, and the safety of the loading site is guaranteed.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. An ammonia recovery device for loading concentrated ammonia water onto a truck, characterized in that: It includes an ammonia main pipe, a first branch pipe, a second branch pipe, a third branch pipe, an ammonia absorption tank, an ammonia absorption pipe, a hydraulic pump, an ammonia water recovery tank, an ammonia water storage unit and an ammonia water delivery pipe; the first branch pipe, the second branch pipe and the third branch pipe are independently arranged and respectively connected to the gas outlet end of the ammonia main pipe; The first branch pipe is connected to the air inlet of the ammonia absorption tank, the top flow port of the ammonia absorption tank is connected to the bottom flow port of the ammonia absorption pipe through a connecting pipe, the upper water inlet of the ammonia absorption pipe is connected to the first demineralized water pipe, and the ammonia water outlet of the ammonia absorption tank is connected to the tank inlet pipe of the ammonia water recovery tank through the first ammonia water recovery pipe; The air outlet end of the second branch pipe is connected to the air inlet of the hydraulic pump, and the water inlet of the hydraulic pump is connected to the second demineralized water pipe; the outlet of the hydraulic pump is connected to the tank inlet pipe of the ammonia recovery tank through the second ammonia recovery pipe; the air outlet of the ammonia recovery tank is connected to the bottom flow port of the ammonia absorption pipe through a pipeline; The third branch pipe is connected to an ammonia water storage unit, and the ammonia water storage unit is used to store concentrated ammonia water. The ammonia water outlet end of the ammonia water storage unit is connected to an ammonia water delivery pipe, and the ammonia water delivery pipe is provided with a first ammonia water pump.

2. The concentrated ammonia water loading ammonia recovery device as claimed in claim 1, characterized in that: The ammonia main pipe is provided with a first valve and a second valve in sequence along the direction of gas flow; the first branch pipe is provided with a third valve; the second branch pipe is provided with a fourth valve and a first pressure sensor; the second demineralized water pipe is provided with a fifth valve; the second ammonia water recovery pipe is provided with a sixth valve; the third branch pipe is provided with an eighth valve; the ammonia water delivery pipe is provided with a first ammonia water pump, a ninth valve, a flow meter, a tenth valve and an eleventh valve in sequence along the direction of ammonia water flow.

3. The concentrated ammonia water loading ammonia recovery device as claimed in claim 2, characterized in that: The first valve is arranged at the air inlet end of the ammonia main pipe, and the ammonia main pipe between the first valve and the second valve is a hose structure.

4. The concentrated ammonia water loading ammonia recovery device as claimed in claim 2, characterized in that: The eleventh valve is arranged at the outlet end of the ammonia water delivery pipe, and the ammonia water delivery pipe between the tenth valve and the eleventh valve is a hose structure.

5. The concentrated ammonia water loading ammonia recovery device as claimed in claim 1, characterized in that: The ammonia water storage unit includes at least two ammonia water storage tanks arranged in parallel, and the ammonia water storage tanks are equipped with a second pressure sensor.

6. The concentrated ammonia water loading ammonia recovery device as claimed in claim 1, characterized in that: The top of the ammonia water recovery tank is provided with an air outlet, and the air outlet of the ammonia water recovery tank passes through an ammonia reflux pipe and a bottom flow port of the ammonia absorption pipe.

7. A method for recovering ammonia gas from concentrated ammonia water loading, characterized in that: The method is implemented by the concentrated ammonia water loading ammonia recovery device as claimed in any one of claims 1 to 6, comprising the following steps: S1. Preparation for loading: connect the air inlet end of the ammonia main pipe to the top air outlet of the concentrated ammonia water delivery tank truck, and connect the inlet end of the ammonia water delivery pipe to the top ammonia water inlet of the concentrated ammonia water delivery tank truck to complete the preparation for loading; S2, loading implementation: open the valves on each pipe, start the hydraulic pump, use the hydraulic pump to mix the volatilized ammonia gas and desalted water in the concentrated ammonia water delivery tank car and input them into the ammonia water recovery tank; start the first ammonia water pump, and use the first ammonia water pump to input the concentrated ammonia water in the ammonia water storage unit into the concentrated ammonia water delivery tank car; S3. After loading is completed, close the first ammonia water pump, hydraulic pump and valves on each pipe, and remove the ammonia main pipe and ammonia water delivery pipe from the concentrated ammonia water delivery tank truck.

8. The method for recovering ammonia gas by loading concentrated ammonia water onto a truck as claimed in claim 7, characterized in that: Step S1 specifically includes: S11, after the concentrated ammonia water delivery tank truck is parked, the air inlet end of the ammonia main pipe 1 is connected to the top air outlet of the concentrated ammonia water delivery tank truck, and the inlet end of the ammonia water delivery pipe is connected to the top ammonia water inlet of the concentrated ammonia water delivery tank truck; S12, opening the second valve and the eighth valve, so that the ammonia gas retained in the ammonia main pipe and the third branch pipe is discharged into the ammonia water storage tank for absorption and dissolution, and the air pressure in the ammonia water storage tank is monitored in real time by the second pressure sensor; S13, opening the first flow regulating valve to allow the demineralized water to flow into the ammonia absorption pipe and the ammonia absorption tank in sequence at a flow rate of 1 to 3 t / h; The sixth valve, the fourth valve and the fifth valve are opened in sequence, and the hydraulic pump is started, so that the demineralized water flows through the fifth valve, the hydraulic pump and the sixth valve in sequence at a flow rate of 1 to 3 t / h and then enters the ammonia recovery tank, and the air pressure in the second branch pipe is monitored in real time by the first pressure sensor; S14, after the air pressure in the ammonia water storage tank is 0-3 KPa and the air pressure in the second branch pipe is 0-3 KPa, open the first valve and monitor the air pressure in the concentrated ammonia water delivery tank truck through the pressure sensor equipped in the concentrated ammonia water delivery tank truck; S15. After the air pressure in the concentrated ammonia water transport tanker is balanced to 0-3KPa, open the eleventh valve and the tenth valve, and the loading preparation work is completed.

9. The method for recovering ammonia gas by loading concentrated ammonia water onto a truck as claimed in claim 7, characterized in that: Step S2 specifically includes: S21, start the first ammonia water pump, adjust the opening of each valve on the ammonia water delivery pipe, so that the concentrated ammonia water is discharged from the bottom of the ammonia water storage tank and flows into the concentrated ammonia water delivery tank truck, and control the concentrated ammonia water outlet flow rate of the first ammonia water pump at 3-5 t / h; Slowly adjust the opening of the fifth valve to adjust the water flow rate of the hydraulic pump to 2-4 t / h, so that the air pressure in the second branch pipe is maintained at -2-6 KPa; S22. Adjust the opening of each valve on the ammonia delivery pipe so that the concentrated ammonia can be input into the concentrated ammonia delivery tank truck at a flow rate of 10 to 14 t / h, and the air pressure in the ammonia storage tank is maintained at -2 to 6 KPa until the required amount of ammonia is loaded.

10. The method for recovering ammonia gas by loading concentrated ammonia water onto a truck as claimed in claim 7, characterized in that: Step S3 specifically includes: S31, close the first ammonia water pump and the ninth valve, and close the tenth valve after 1 to 3 minutes; S32, close the eleventh valve and the ammonia inlet valve of the concentrated ammonia tank truck in sequence, and adjust the water inlet flow of the hydraulic pump to maintain the air pressure in the second branch pipe at -2 to 6 KPa; S33, closing the ammonia outlet valve and the first valve of the concentrated ammonia water delivery tank truck in sequence, and removing the ammonia main pipe and the ammonia water delivery pipe from the concentrated ammonia water delivery tank truck; S34, close the fourth valve, the fifth valve, the sixth valve and the eighth valve in sequence; close the first flow regulating valve and the second flow regulating valve.

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