Liquid ammonia storage equipment for doping ammonia in coal-fired power plant

Abstract

The utility model discloses liquid ammonia storage equipment for ammonia doping in a coal-fired power plant, which belongs to the technical field of liquid ammonia storage and comprises a low-pressure cooling storage system and a medium-pressure normal-temperature storage system. The low-pressure cooling storage system comprises a plurality of low-pressure spherical tanks connected with liquid ammonia supply equipment; the evaporation gas compressor is connected with the low-pressure spherical tank; the main condenser is connected with the boil-off gas compressor and the medium-pressure normal-temperature storage system, and superheated gas ammonia output by the boil-off gas compressor exchanges heat with liquid ammonia in the medium-pressure normal-temperature storage system in the main condenser and is condensed into liquid ammonia to be output; the pressure reducing valve group is connected with the main condenser and the low-pressure spherical tank; the liquid ammonia is stored in a mode of combining the low-pressure cooling storage system and the medium-pressure normal-temperature storage system, and the system has the remarkable advantages of being good in comprehensive economy, low in investment and operation cost, high in safety, capable of saving energy and water and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid ammonia storage technical field more specifically, especially, it is a kind of liquid ammonia storage equipment for coal-fired power plant ammonia blending. BACKGROUND

[0002] China's coal-fired power plant is the largest carbon emission source, and it is urgent to reduce carbon emissions of coal-fired power plant; at present, one of the most feasible low-carbon transformation technical paths for coal-fired power plant is green ammonia blending, and after the transformation and construction of coal power unit ammonia blending, more than 10% green ammonia is blended, and the consumption of coal and carbon emission level is significantly reduced; but when green ammonia is used as fuel to replace part of coal, the consumption is huge, and how to realize large-scale, efficient, economic and safe storage of liquid ammonia is particularly important.

[0003] At present, liquid ammonia usually has three storage methods of medium-pressure normal temperature, low-pressure cooling and normal pressure low temperature; the medium-pressure normal temperature storage process is simple, safe, and has the lowest operation and running cost, and does not need to configure refrigeration system, but the tank wall thickness is the largest, and at present, due to the limitation of domestic material and manufacturing capacity, the maximum nominal volume of single tank can only reach 3000m 3 , and the engineering investment cost is the highest; the normal pressure low temperature storage process is the most complex, and must configure refrigeration public system, the storage liquid ammonia temperature is lower than-33 DEG C, a large amount of electric energy and cooling water are consumed, and the heat generated by the system is not effectively recycled, so although the engineering investment cost is the lowest, the operation and running cost is the highest; and the low-pressure cooling storage has various process parameters and investment, running cost between medium-pressure normal temperature storage and normal pressure low temperature storage.

[0004] The above three kinds of liquid ammonia storage methods have advantages and disadvantages; in the scenario of coal-fired power plant ammonia blending, because the stored liquid ammonia needs to be heated and evaporated into ammonia gas by liquid ammonia evaporator before being sent into coal-fired boiler for mixed combustion and power generation, therefore, the higher the temperature of stored liquid ammonia, the less the energy loss of storage system, which is more conducive to reducing steam consumption and improving energy utilization rate in liquid ammonia evaporation process; but too high liquid ammonia storage temperature will increase the design pressure of liquid ammonia tank, resulting in increased tank wall thickness, and further increasing the investment cost of liquid ammonia storage system; the three kinds of liquid ammonia storage methods in traditional technology cannot simultaneously consider energy utilization rate and engineering investment cost, and it is difficult to store liquid ammonia at relatively high temperature with low investment and running cost. INVENTION CONTENTS

[0005] The utility model aims at solving the technical problem that traditional method is difficult to simultaneously consider energy utilization rate and engineering investment cost for storing liquid ammonia, and proposes a kind of liquid ammonia storage equipment for coal-fired power plant ammonia blending.

[0006] In order to achieve the above object, the utility model adopts the following technical scheme:

[0007] The application discloses a liquid ammonia storage device for coal-fired power plant ammonia blending, which comprises a low-pressure and low-temperature storage system and a medium-pressure and normal-temperature storage system connected with the low-pressure and low-temperature storage system; the low-pressure and low-temperature storage system cooperates with the medium-pressure and normal-temperature storage system to increase the temperature of liquid ammonia in the medium-pressure and normal-temperature storage system and maintain the stable internal pressure of the low-pressure and low-temperature storage system; the low-pressure and low-temperature storage system comprises:

[0008] a plurality of low-pressure spherical tanks connected with a liquid ammonia supply device;

[0009] an evaporation gas compressor connected with the low-pressure spherical tanks and used for compressing and increasing the pressure of evaporation gas generated in the low-pressure spherical tanks;

[0010] a main condenser connected with the evaporation gas compressor and the medium-pressure and normal-temperature storage system, wherein superheated gas ammonia output by the evaporation gas compressor exchanges heat with liquid ammonia in the medium-pressure and normal-temperature storage system in the main condenser to condense into liquid ammonia and output;

[0011] a pressure reducing valve group connected with the main condenser and the low-pressure spherical tanks and used for reducing the pressure of liquid ammonia output by the main condenser and then conveying the liquid ammonia to the low-pressure spherical tanks for storage.

[0012] Further, the medium-pressure and normal-temperature storage system comprises:

[0013] a plurality of medium-pressure spherical tanks connected with the main condenser through a to-be-heated liquid ammonia conveying pipeline, wherein a liquid ammonia circulating pump is arranged on the to-be-heated liquid ammonia conveying pipeline and used for pumping liquid ammonia stored in the medium-pressure spherical tanks to the main condenser for heat exchange.

[0014] Further, the medium-pressure spherical tanks are independent of each other, the main condenser is connected with the medium-pressure spherical tanks through a heated liquid ammonia conveying pipeline, and the heated liquid ammonia conveying pipeline is used for conveying heated liquid ammonia back to the medium-pressure spherical tanks for storage.

[0015] Further, the heated liquid ammonia conveying pipeline is provided with a number of discharge ends matched with the number of the medium-pressure spherical tanks, the discharge ends are respectively connected with the corresponding medium-pressure spherical tanks in communication, and control valves are respectively arranged on the discharge ends and used for controlling the state of conveying liquid ammonia from the main condenser to the corresponding medium-pressure spherical tanks.

[0016] Further, the low-pressure and low-temperature storage system further comprises a standby condenser connected with the evaporation gas compressor and the pressure reducing valve group through a pipeline and arranged in parallel with the main condenser.

[0017] Further, the medium-pressure spherical tank is connected with the liquid ammonia evaporator through a liquid ammonia discharge pipeline, and a liquid ammonia discharge pump is arranged on the liquid ammonia discharge pipeline.

[0018] Further, a liquid ammonia conveying pipeline is connected between the low-pressure spherical tank and the medium-pressure spherical tank, and a liquid ammonia transfer pump is arranged on the liquid ammonia conveying pipeline, and the liquid ammonia transfer pump is used to pump the liquid ammonia in the low-pressure spherical tank into the medium-pressure spherical tank.

[0019] The beneficial effects of the utility model are as follows: the liquid ammonia storage equipment for coal-fired power plant ammonia mixing provided by the application stores liquid ammonia in a combined mode of a low-pressure cooling storage system and a medium-pressure normal-temperature storage system, uses the heat energy released in the low-pressure cooling storage system to heat liquid ammonia, reduces the steam consumption during subsequent liquid ammonia evaporation, uses the cold energy of liquid ammonia in the medium-pressure normal-temperature storage system to refrigerate the low-pressure cooling storage system, avoids overpressure of the low-pressure cooling storage system, solves the technical problem that the traditional mode of storing liquid ammonia cannot simultaneously consider energy utilization rate and engineering investment cost, and has the advantages of good comprehensive economy, low investment and operation cost, high safety, energy saving and water saving, and the like. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A schematic view of the liquid ammonia storage equipment for coal-fired power plant ammonia mixing provided in the utility model embodiment is shown in the figure.

[0021] The marks in the figure are shown as follows:

[0022] 1, low-pressure cooling storage system;

[0023] 11, low-pressure spherical tank; 12, evaporation gas compressor; 13, main condenser; 131, standby condenser; 14, pressure reducing valve group;

[0024] 2, medium-pressure normal-temperature storage system;

[0025] 21, medium-pressure spherical tank; 22, liquid ammonia discharge pump; 23, liquid ammonia circulating pump; 24, liquid ammonia transfer pump. DETAILED DESCRIPTION

[0026] The technical solutions in the utility model embodiments will be described clearly and completely below with reference to the drawings in the utility model embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0027] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications will also change accordingly.

[0028] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be internal communication of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In addition, if the present application embodiments involve "first", "second" and the like, the "first", "second" and the like are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0030] Please refer to Figure 1 The embodiment of the present application provides a kind of liquid ammonia storage equipment for coal-fired power plant mixed ammonia, in actual application, liquid ammonia storage equipment for coal-fired power plant mixed ammonia is connected with liquid ammonia supply equipment, liquid ammonia evaporator, it can store liquid ammonia with relatively high temperature, while maintaining stable internal pressure of equipment, and liquid ammonia can be output to liquid ammonia evaporator and evaporated into ammonia gas according to demand.

[0031] The liquid ammonia storage equipment for coal-fired power plant ammonia blending comprises: a low-pressure cooling storage system 1 and a medium-pressure normal-temperature storage system 2; the internal storage of the low-pressure cooling storage system 1 and the medium-pressure normal-temperature storage system 2 is liquid ammonia; through the cooperation between the low-pressure cooling storage system 1 and the medium-pressure normal-temperature storage system 2, on the one hand, the temperature of the liquid ammonia in the medium-pressure normal-temperature storage system 2 is raised by recycling the energy released by the low-pressure cooling storage system 1, thereby reducing the heat consumption required for subsequent evaporation of the liquid ammonia, improving the energy utilization rate, on the other hand, the low-pressure cooling storage system 1 is refrigerated by using the cold energy of the liquid ammonia stored in the medium-pressure normal-temperature storage system 2, thereby maintaining the stability of the internal pressure of the low-pressure cooling storage system 1 and improving the comprehensive economy and safety of the entire liquid ammonia storage equipment.

[0032] In the above technical solution, the low-pressure cooling storage system 1 comprises: a low-pressure spherical tank 11, an evaporation gas compressor 12, a main condenser 13 and a pressure reducing valve group 14;

[0033] The low-pressure spherical tank 11 is arranged in several groups and is connected with a liquid ammonia supply device; the liquid ammonia supply device can be a liquid ammonia pump of a green ammonia synthesis plant; the green ammonia produced by the green ammonia synthesis plant is pumped into each low-pressure spherical tank 11 through a buried liquid ammonia conveying pipeline for storage; compared with a cylindrical container, the low-pressure spherical tank 11 has a smaller surface area and requires less steel material under the same volume and pressure; under the same diameter, the low-pressure spherical tank 11 has a smaller and more uniform wall stress, and its bearing capacity is twice that of a cylindrical container, so that the design wall thickness of the low-pressure spherical tank 11 only needs to be half of that of the corresponding cylindrical container, thereby achieving the purpose of greatly reducing the consumption of steel materials.

[0034] The low-pressure spherical tank 11 will produce a part of evaporation gas (BOG) due to environmental heat absorption, feeding and other reasons during ammonia storage; the evaporation gas is saturated gas ammonia; if the evaporation gas is not treated, it is easy to cause the low-pressure spherical tank 11 to enter an overpressure state, thereby triggering the opening of the safety valve of the low-pressure spherical tank 11, which will seriously affect the safe and stable operation of the ammonia storage system; in this embodiment, the evaporation gas compressor 12 is connected with the low-pressure spherical tank 11 through a pipeline; the evaporation gas produced in the low-pressure spherical tank 11 enters the evaporation gas compressor 12 through the pipeline to be compressed and pressurized, thereby converting the saturated gas ammonia into high-pressure superheated gas ammonia;

[0035] The main condenser 13 is connected with the evaporation gas compressor 12 and the medium-pressure normal-temperature storage system 2; the high-pressure superheated gas ammonia output by the evaporation gas compressor 12 is liquefied into high-pressure liquid ammonia by effectively releasing heat to the outside world after entering the main condenser 13 through the pipeline due to its high pressure and high temperature properties; the liquid ammonia in the medium-pressure normal-temperature storage system 2 is transported into the main condenser 13 to obtain the heat released by the high-pressure superheated gas ammonia, thereby raising the temperature of the liquid ammonia; the high-pressure superheated gas ammonia after heat exchange is condensed into liquid ammonia and output;

[0036] The pressure reducing valve group 14 is connected with the main condenser 13 and the low-pressure spherical tank 11 through pipelines; the high-pressure liquid ammonia output by the main condenser 13 is reduced in pressure by the pressure reducing valve group 14 and then transported back to the low-pressure spherical tank 11 through the pipeline for storage; the pressure reducing valve group 14 is arranged to reduce the pressure of the liquid ammonia output by the main condenser 13, so that the boiling point is reduced and the evaporation heat absorption process can be realized at normal temperature.

[0037] The technical scheme of the present application adopts the design of the low-pressure cooling storage system 1, wherein the evaporation gas compressor 12, the main condenser 13 and the pressure reducing valve group 14 jointly constitute a set of refrigeration system to perform refrigeration treatment on the saturated gas ammonia generated by the low-pressure spherical tank 11, the low-temperature and low-pressure liquid ammonia obtained is returned to the low-pressure spherical tank 11, and the low-temperature and low-pressure liquid ammonia is used to refrigerate the newly generated saturated gas ammonia in the low-pressure spherical tank 11 to maintain the heat balance inside the low-pressure spherical tank 11; the technical scheme can avoid the low-pressure spherical tank 11 from entering an overpressure state, does not need to use a storage tank with a greater wall thickness, can enable the system to operate safely and stably, and can achieve the purpose of reducing the investment cost of the liquid ammonia storage system.

[0038] In the above technical scheme, the medium-pressure normal-temperature storage system 2 comprises: a plurality of medium-pressure spherical tanks 21 arranged in an array; the medium-pressure spherical tanks 21 are independently arranged and not connected with each other; the medium-pressure spherical tanks 21 are connected with the liquid ammonia evaporator through a liquid ammonia discharge pipeline, and the liquid ammonia stored in the medium-pressure spherical tanks 21 is pumped to the liquid ammonia evaporator by a liquid ammonia discharge pump 22; the medium-pressure spherical tanks 21 are connected with the main condenser 13 through a to-be-heated liquid ammonia conveying pipeline, and a liquid ammonia circulating pump 23 is arranged on the to-be-heated liquid ammonia conveying pipeline to pump the liquid ammonia stored in the medium-pressure spherical tanks 21 to the main condenser 13; the liquid ammonia entering the main condenser 13 exchanges heat with the high-pressure superheated gas ammonia to recover a large amount of heat released in the condensation process of the high-pressure superheated gas ammonia, so that the purpose of heating the liquid ammonia is achieved.

[0039] In the embodiment, a heated liquid ammonia conveying pipeline is further arranged between the main condenser 13 and the medium-pressure spherical tank 21 to convey the liquid ammonia output after being heated in the main condenser 13; the heated liquid ammonia conveying pipeline is provided with a number of discharge ends matched with the number of the medium-pressure spherical tanks 21, the discharge ends of the heated liquid ammonia conveying pipeline are respectively connected with the corresponding medium-pressure spherical tanks 21 in communication, and control valves are respectively arranged on the discharge ends of the heated liquid ammonia conveying pipeline to control the state of conveying the liquid ammonia from the main condenser 13 to the medium-pressure spherical tanks 21.

[0040] As an embodiment of the present application, the temperature regulating upper limit range of the low-pressure temperature reduction storage system 1 when refrigerating liquid ammonia is -5℃ to 25℃, the temperature regulating upper limit range of the medium-pressure normal-temperature storage system 2 when heating liquid ammonia is 35℃ to 45℃, and the specific temperature regulating upper limit value needs to be determined according to engineering design; when it is detected that the liquid ammonia temperature measurement value in a certain medium-pressure spherical tank 21 does not exceed the temperature regulating upper limit value, the liquid ammonia in the medium-pressure spherical tank 21 is pressurized by the liquid ammonia circulating pump 23 and then delivered to the main condenser 13 to exchange heat with the high-pressure superheated gaseous ammonia, and the heated liquid ammonia is finally delivered back to the medium-pressure spherical tank 21; in this process, the energy generated by the work of the liquid ammonia circulating pump 23 can also be recovered synchronously, the heat generated by the internal operation of the system is recovered to increase the storage temperature of the liquid ammonia in the medium-pressure spherical tank 21, so as to reduce the heat consumed in the subsequent evaporation of the liquid ammonia; if it is detected that the liquid ammonia temperature measurement value in the medium-pressure spherical tank 21 has reached the temperature regulating upper limit value during the delivery of the liquid ammonia back to the medium-pressure spherical tank 21, the corresponding control valve is immediately closed to stop the delivery of the liquid ammonia to the medium-pressure spherical tank 21, so that the heated liquid ammonia is delivered to the remaining medium-pressure spherical tanks 21 which do not exceed the temperature to be stored.

[0041] More specifically, the low-pressure spherical tank 11 selects the design temperature and the corresponding design pressure according to the temperature regulating upper limit and considering a certain margin; the medium-pressure spherical tank 21 is usually designed to have a temperature of 50℃ and a corresponding design pressure of 2.1MPa(A), and the specific design temperature and design pressure need to be selected in combination with the local maximum ambient temperature.

[0042] In the present embodiment, the low-pressure temperature reduction storage system 1 further comprises a standby condenser 131; the standby condenser 131 is connected in parallel with the main condenser 13 through a pipeline; when it is detected that the liquid ammonia temperature in all the medium-pressure spherical tanks 21 reaches the temperature regulating upper limit value, the delivery of the liquid ammonia to the main condenser 13 is stopped, and the standby condenser 131 is started to condense the high-pressure superheated gaseous ammonia in the low-pressure temperature reduction storage system 1 by using circulating cooling water as the cooling medium.

[0043] In the present embodiment, the low-pressure spherical tank 11 and the medium-pressure spherical tank 21 are connected through a liquid ammonia delivery pipeline, and the liquid ammonia delivery pipeline is provided with a liquid ammonia transfer pump 24; this design is adopted because the working pressure in the medium-pressure spherical tank 21 is greater than that in the low-pressure spherical tank 11, and the liquid ammonia in the low-pressure spherical tank 11 can be transferred to the medium-pressure spherical tank 21 only by setting the liquid ammonia transfer pump 24; by using this technical solution, when the coal-fired power plant ammonia blending system is short-term shutdown, if there is still sufficient liquid ammonia storage capacity in the medium-pressure spherical tank 21, the liquid ammonia in the low-pressure spherical tank 11 can be slowly transferred to the medium-pressure spherical tank 21 through the liquid ammonia transfer pump 24, so as to control the amount of evaporation gas generated in the low-pressure spherical tank 11, thereby ensuring that the low-pressure spherical tank 11 does not operate under overpressure.

[0044] The liquid ammonia storage equipment for coal-fired power plant ammonia blending provided by the application stores liquid ammonia in a combined manner of a low-pressure cooling storage system 1 and a medium-pressure normal-temperature storage system 2, uses the heat energy released in the low-pressure cooling storage system 1 to heat the liquid ammonia, reduces the steam consumption in subsequent liquid ammonia evaporation, uses the cold energy of the liquid ammonia in the medium-pressure normal-temperature storage system 2 to refrigerate the low-pressure cooling storage system 1, avoids overpressure of the low-pressure cooling storage system 1, solves the technical problem that the traditional liquid ammonia storage method cannot simultaneously consider energy utilization rate and engineering investment cost, and has the advantages of good comprehensive economy, low investment and operation cost, high safety, energy saving and water saving, and the like.

[0045] The above merely describes a preferred specific implementation manner of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacements or changes according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A liquid ammonia storage device for ammonia-doping of a coal-fired power plant, characterized by The application relates to a low-pressure and low-temperature storage system and a medium-pressure and normal-temperature storage system connected with the low-pressure and low-temperature storage system. The low-pressure and low-temperature storage system cooperates with the medium-pressure and normal-temperature storage system to increase the temperature of liquid ammonia in the medium-pressure and normal-temperature storage system and maintain the internal pressure of the low-pressure and low-temperature storage system stable. The low-pressure and low-temperature storage system comprises: a plurality of low-pressure spherical tanks connected with a liquid ammonia supply device; an evaporation gas compressor connected with the low-pressure spherical tanks and used for compressing the evaporation gas generated in the low-pressure spherical tanks; a main condenser connected with the evaporation gas compressor and the medium-pressure and normal-temperature storage system, wherein the superheated ammonia output by the evaporation gas compressor exchanges heat with the liquid ammonia in the medium-pressure and normal-temperature storage system in the main condenser to condense into liquid ammonia and output; a pressure-reducing valve group connected with the main condenser and the low-pressure spherical tanks and used for reducing the pressure of the liquid ammonia output by the main condenser and conveying the liquid ammonia into the low-pressure spherical tanks for storage. The medium-pressure and normal-temperature storage system comprises:

2. The liquid ammonia storage device for ammonia-doping of a coal-fired power plant according to claim 1, characterized by, a plurality of medium-pressure spherical tanks connected with the main condenser through a liquid ammonia conveying pipeline to be heated, wherein a liquid ammonia circulating pump is arranged on the liquid ammonia conveying pipeline to be heated and is used for pumping the liquid ammonia stored in the medium-pressure spherical tanks into the main condenser for heat exchange. The medium-pressure spherical tanks are independent of each other, and the main condenser is connected with the medium-pressure spherical tanks through a heated liquid ammonia conveying pipeline, wherein the heated liquid ammonia conveying pipeline is used for conveying the heated liquid ammonia back into the medium-pressure spherical tanks for storage.

3. The liquid ammonia storage device for coal-fired power plants according to claim 2, characterized in that, The heated liquid ammonia conveying pipeline is provided with a number of discharge ends matched with the number of the medium-pressure spherical tanks, the discharge ends are respectively connected with the corresponding medium-pressure spherical tanks in communication, and control valves are respectively arranged on the discharge ends and are used for controlling the state of conveying the liquid ammonia from the main condenser into the corresponding medium-pressure spherical tanks.

4. The liquid ammonia storage device for coal-fired power plants according to claim 3, characterized in that, The low-pressure and low-temperature storage system further comprises a standby condenser connected with the evaporation gas compressor and the pressure-reducing valve group through a pipeline and arranged in parallel with the main condenser.

5. The liquid ammonia storage apparatus for ammonia slip of a coal-fired power plant according to claim 1, wherein The medium-pressure spherical tanks are connected with a liquid ammonia evaporator through a liquid ammonia discharging pipeline, and a liquid ammonia discharging pump is arranged on the liquid ammonia discharging pipeline.

6. The liquid ammonia storage apparatus for ammonia slip of a coal-fired power plant according to claim 2, wherein The low-pressure spherical tanks and the medium-pressure spherical tanks are connected with a liquid ammonia conveying pipeline, and a liquid ammonia transfer pump is arranged on the liquid ammonia conveying pipeline and is used for pumping the liquid ammonia in the low-pressure spherical tanks into the medium-pressure spherical tanks.

7. The liquid ammonia storage apparatus for ammonia slip-in of a coal-fired power plant according to claim 2, characterized by, ​

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