Two-stage heat recovery liquid ammonia evaporation device

Abstract

The utility model discloses a two-stage heat recovery liquid ammonia evaporation device, which belongs to the technical field of liquid ammonia evaporators and comprises a first-stage heating mechanism and a second-stage evaporation mechanism. The primary heating mechanism structurally comprises a liquid ammonia heater shell; a low-grade heat source inlet; the low-grade heat source outlet is formed in the liquid ammonia heater shell; a liquid ammonia input end and a liquid ammonia output end are arranged in the heater joint; the liquid ammonia output end is connected with the secondary evaporation mechanism; the feeding end of the heater heat exchange tube bundle is communicated with the liquid ammonia input end, and the discharging end of the heater heat exchange tube bundle is communicated with the liquid ammonia output end; two heat sources are adopted to heat and evaporate the liquid ammonia step by step, the consumption of a high-grade heat source is reduced, a large amount of heat of a low-grade heat source is recycled, and cold energy of the liquid ammonia is fully utilized to cool the low-grade heat source.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid ammonia evaporators, and more specifically, particularly relates to a two-stage heat recovery liquid ammonia evaporator. Background Art

[0002] Green hydrogen is produced by large-scale electrolysis of water using surplus electricity from renewable energy sources such as wind and solar power. However, it is currently difficult to use as fuel on a large scale due to temporary storage and transportation issues. Green hydrogen is further synthesized into green ammonia, which is stored and transported in the form of liquid ammonia. As an energy storage carrier, green ammonia is widely regarded as one of the most effective means of absorbing large amounts of renewable energy electricity.

[0003] Ammonia is a zero-carbon fuel that produces no carbon dioxide when burned. It is a renewable clean fuel that can be used to replace fossil fuels such as coal and natural gas. When green ammonia is used in coal-fired power plants to co-fire with coal for power generation, it can replace part of the coal to achieve the effect of reducing carbon emissions and pollution, and serve as a new energy storage and peak-shaving role. It is one of the most feasible technical approaches for the current clean and low-carbon transformation and upgrading of my country's coal-fired power industry.

[0004] When coal-fired power plants burn green ammonia, they must first evaporate the liquid ammonia, and then send the obtained ammonia gas into the ammonia coal burner for combustion. Taking a 660,000-kilowatt unit coal-fired boiler ammonia combustion power generation project as an example, burning 10% ammonia (in terms of calorific value) requires about 28 t / h of ammonia. If the coal-fired power plant is configured according to a liquid ammonia evaporator and a small design margin is considered, at least a 30 t / h liquid ammonia evaporator is required. At present, there is no such large liquid ammonia evaporator on the market. In addition, traditional technology usually uses steam heating, and a large amount of heat energy is consumed during the heating and evaporation of liquid ammonia. The low-pressure saturated steam consumption of a 30 t / h liquid ammonia evaporator is about 20 t / h. The consumption of a large amount of steam is bound to affect the economic benefits of coal-fired power plants. In addition, because the large liquid ammonia evaporator consumes less steam when running at low load, the temperature of the liquid ammonia entering the evaporator is low when the evaporator is started, which can easily cause the steam condensate in the tube bundle to freeze and block the pipe. Therefore, a high-efficiency, energy-saving, safe and stable large-flow liquid ammonia evaporation device is urgently needed. Utility Model Content

[0005] The utility model aims to solve the technical problem of large consumption of high-grade heat source when heating and evaporating liquid ammonia in the prior art, and proposes a two-stage heat recovery liquid ammonia evaporation device.

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

[0007] A two-stage heat recovery liquid ammonia evaporation device, the two-stage heat recovery liquid ammonia evaporation device is connected to a low-grade heat source supply device and a high-grade heat source supply device; the two-stage heat recovery liquid ammonia evaporation device comprises: a primary heating mechanism and a secondary evaporation mechanism connected to one side of the primary heating mechanism; the secondary evaporation mechanism is used to heat and evaporate the liquid ammonia preheated by the primary heating mechanism into ammonia gas for output;

[0008] Wherein, the first-level heating mechanism structure includes:

[0009] Liquid ammonia heater housing;

[0010] A low-grade heat source inlet, which is arranged at the bottom of the liquid ammonia heater shell and is connected to a low-grade heat source supply device;

[0011] A low-grade heat source outlet, wherein the low-grade heat source outlet is arranged on the shell of the liquid ammonia heater;

[0012] A heater connector, the heater connector is arranged on one side of the liquid ammonia heater housing; the heater connector includes a liquid ammonia input end and a liquid ammonia output end, the liquid ammonia input end and the liquid ammonia output end are isolated from each other; the liquid ammonia output end is connected to the secondary evaporation mechanism;

[0013] A heater heat exchange tube bundle, wherein the heater heat exchange tube bundle is located in the liquid ammonia heater shell, and the feed end of the heater heat exchange tube bundle is connected to the liquid ammonia input end, and the discharge end of the heater heat exchange tube bundle is connected to the liquid ammonia output end.

[0014] Furthermore, the secondary evaporation mechanism comprises:

[0015] A liquid ammonia evaporator shell, wherein the liquid ammonia evaporator shell is a tank structure;

[0016] An evaporator joint, the evaporator joint is arranged on one side of the liquid ammonia evaporator shell; the evaporator joint includes a high-grade heat source input end and a high-grade heat source output end, the high-grade heat source input end and the high-grade heat source output end are isolated from each other; the high-grade heat source input end is connected to a high-grade heat source supply device;

[0017] An evaporator heat exchange tube bundle, wherein the evaporator heat exchange tube bundle is located in the liquid ammonia evaporator shell, and the feed end of the evaporator heat exchange tube bundle is connected to the high-grade heat source input end, and the discharge end of the evaporator heat exchange tube bundle is connected to the high-grade heat source output end;

[0018] A delivery pipeline interface, wherein the delivery pipeline interface is arranged at the bottom of the liquid ammonia evaporator shell, the delivery pipeline interface is connected to a delivery pipeline, and the delivery pipeline interface is connected to the liquid ammonia output end through the delivery pipeline;

[0019] An ammonia outlet is provided at the top of the liquid ammonia evaporator shell.

[0020] Furthermore, a plurality of baffles are provided on the inner wall of the shell of the liquid ammonia heater, the baffles are arranged in parallel, and the heat exchange tube bundles of the heater are respectively passed through the baffles.

[0021] Furthermore, a plurality of support plates are provided on the inner wall of the shell of the liquid ammonia evaporator, and flow holes for passing liquid ammonia are provided on the edges of the support plates, and the evaporator heat exchange tube bundles are respectively penetrated through the support plates.

[0022] Furthermore, the top of the liquid ammonia evaporator shell is provided with: a safety valve interface, a temperature measuring point interface and a pressure measuring point interface; and a liquid level interface is provided on one side of the liquid ammonia evaporator shell.

[0023] Furthermore, a heater bracket is provided outside the liquid ammonia heater shell; an evaporator bracket is provided outside the liquid ammonia evaporator shell, the evaporator bracket is connected to the heater bracket, and the secondary evaporation mechanism is fixed above the primary heating mechanism through the evaporator bracket.

[0024] Furthermore, the heater connector is detachably connected to the liquid ammonia heater housing; the evaporator connector is detachably connected to the liquid ammonia evaporator housing.

[0025] The beneficial effects of the utility model are as follows: a two-stage heat recovery liquid ammonia evaporation device provided by the present application divides the liquid ammonia heating evaporation process into two stages by arranging a primary heating mechanism and a secondary evaporation mechanism in series, which can effectively reduce the consumption of high-grade heat sources, recover a large amount of heat from low-grade heat sources, and make full use of the cold energy of liquid ammonia to cool the low-grade heat sources. It has the advantages of compact structure, small footprint, safe and stable operation, etc. At the same time, because the temperature of the liquid ammonia entering the secondary evaporation mechanism is relatively high, the steam condensate in the tube bundle will not freeze and block the tubes, and is suitable for large-flow liquid ammonia evaporation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of a two-stage heat recovery liquid ammonia evaporation device provided in an embodiment of the utility model;

[0027] Figure 2 This is a schematic diagram of the internal structure of a two-stage heat recovery liquid ammonia evaporation device provided in an embodiment of the utility model;

[0028] The markings in the figure are as follows:

[0029] 1. Primary heating mechanism;

[0030] 11. Liquid ammonia heater shell; 12. Low-grade heat source inlet; 13. Low-grade heat source outlet; 14. Heater joint; 141. Liquid ammonia input end; 142. Liquid ammonia output end; 143. Transport pipeline; 15. Heater heat exchange tube bundle; 16. Baffle; 17. Heater bracket;

[0031] 2. Secondary evaporation mechanism;

[0032] 21. Liquid ammonia evaporator shell; 211. Safety valve interface; 212. Temperature measuring point interface; 213. Pressure measuring point interface; 214. Liquid level interface; 22. Evaporator joint; 221. High-grade heat source input end; 222. High-grade heat source output end; 23. Evaporator heat exchange tube bundle; 24. Delivery pipeline interface; 25. Ammonia outlet; 26. Support plate; 261. Flow channel hole; 27. Evaporator bracket. DETAILED DESCRIPTION

[0033] 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 of 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.

[0034] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0037] See also Figure 1 to Figure 2 The embodiment of the present application shown provides a two-stage heat recovery liquid ammonia evaporation device. In actual applications, the two-stage heat recovery liquid ammonia evaporation device is connected to a low-grade heat source supply device and a high-grade heat source supply device. The two heat sources are used to heat and evaporate the liquid ammonia step by step, thereby achieving the effect of reducing the consumption of the high-grade heat source. At the same time, a large amount of heat from the low-grade heat source is recovered, and the cold energy of the liquid ammonia is fully utilized to cool the low-grade heat source.

[0038] See also Figure 1 The two-stage heat recovery liquid ammonia evaporation device comprises: a primary heating mechanism 1 and a secondary evaporation mechanism 2; the primary heating mechanism 1 is used to recover low-grade heat source to preheat liquid ammonia; in this embodiment, the secondary evaporation mechanism 2 is connected to the top of the primary heating mechanism 1 and is fixed in a detachable manner such as bolt connection to achieve the purpose of reducing the overall footprint of the device and facilitating installation and maintenance. It can be understood that according to the actual available space on the site, the primary heating mechanism 1 and the secondary evaporation mechanism 2 can also be arranged on the same horizontal plane; the secondary evaporation mechanism 2 is used to heat and evaporate the liquid ammonia preheated by the primary heating mechanism 1 into ammonia gas and then output it; it needs to be said It is clear that the low-grade heat source supply equipment can be used, for example, as a circulating water system of a power plant or a flue gas condenser at a desulfurization outlet; the circulating water output from the circulating water system of a power plant or the flue gas condenser at a desulfurization outlet is used as a low-grade heat source. This design can not only effectively utilize the cold energy of liquid ammonia, but also cool the circulating water and recover its low-grade waste heat; the high-grade heat source supply equipment can be used, for example, as a low-pressure steam generator, a low-temperature economizer on the flue of a coal-fired boiler, or a low-temperature economizer; the low-pressure steam output from a low-pressure steam generator, or the hot water output from an economizer is used as a high-grade heat source, wherein the economizer utilizes the waste heat of flue gas to heat water, and the temperature of the hot water does not exceed 100°C.

[0039] More specifically, the primary heating mechanism 1 includes: a liquid ammonia heater shell 11, a low-grade heat source inlet 12, a low-grade heat source outlet 13, a heater joint 14, and a heater heat exchange tube bundle 15;

[0040] As an embodiment of the present application, the primary heating mechanism 1 adopts a shell and tube heat exchanger, and the liquid ammonia heater shell 11 is a tank structure as a whole; the low-grade heat source inlet 12 is arranged at the bottom of the liquid ammonia heater shell 11 and is close to one side end surface of the liquid ammonia heater shell 11; the low-grade heat source inlet 12 is connected to the low-grade heat source supply equipment, and the low-grade heat source supply equipment passes the low-grade heat source from one end of the liquid ammonia heater shell 11 into the interior of the liquid ammonia heater shell 11 through the low-grade heat source inlet 12.

[0041] The low-grade heat source outlet 13 is arranged at one end of the liquid ammonia heater shell 11 away from the low-grade heat source inlet 12 and close to the top of the liquid ammonia heater shell 11; by adopting the above technical scheme, in the process of introducing the low-grade heat source into the liquid ammonia heater shell 11, the low-grade heat source is gradually filled from the bottom of the liquid ammonia heater shell 11 to the top until the entire liquid ammonia heater shell 11 is filled, so as to ensure that the liquid ammonia in each area of ​​the liquid ammonia heater shell 11 can exchange heat with the low-grade heat source.

[0042] The heater connector 14 is disposed on one side of the liquid ammonia heater housing 11 and is used to control the liquid ammonia input / output of the primary heating mechanism 1; for more details, please refer to Figure 2 The heater joint 14 includes a liquid ammonia input end 141 and a liquid ammonia output end 142, which are separated from each other by a partition to form an independent accommodating space; the liquid ammonia output end 142 is connected to the secondary evaporation mechanism 2 through a conveying pipeline 143; the liquid ammonia to be heated and evaporated enters the primary heating mechanism 1 from the liquid ammonia input end 141, leaves the primary heating mechanism 1 from the liquid ammonia output end 142 after completing the heat exchange with the low-grade heat source, and enters the secondary evaporation mechanism 2 through the conveying pipeline 143.

[0043] The heater heat exchange tube bundle 15 is located in the liquid ammonia heater shell 11; in this embodiment, the heater heat exchange tube bundle 15 is in a U-shaped structure, the feed end of which is connected to the liquid ammonia input end 141, and the discharge end of which is connected to the liquid ammonia output end 142; the heater heat exchange tube bundle 15 adopts a U-shaped structure design, which effectively utilizes the space in the length direction of the shell and tube heat exchanger, so that the liquid ammonia has a sufficiently long flow distance in the heater heat exchange tube bundle 15 and a sufficiently large contact area with the heater heat exchange tube bundle 15, so as to fully exchange heat with the low-grade heat source; during the process, the liquid ammonia to be heated in the liquid ammonia input end 141 enters the heater heat exchange tube bundle 15 from the feed end of the heater heat exchange tube bundle 15, and enters the liquid ammonia output end 142 from the discharge end of the heater heat exchange tube bundle 15 after fully exchanging heat with the low-grade heat source.

[0044] In this embodiment, the liquid ammonia output end 142 is located directly above the liquid ammonia input end 141; the positional relationship between the liquid ammonia output end 142 and the liquid ammonia input end 141 corresponds to the positional relationship between the secondary evaporation mechanism 2 and the primary heating mechanism 1; this design can keep the overall conveying direction of the liquid ammonia upward, heat and evaporate step by step, and the heat source and the liquid ammonia flow in the same direction, which helps to improve the heat transfer efficiency.

[0045] As a preferred embodiment of the present application, a plurality of baffles 16 are provided on the inner wall of the liquid ammonia heater shell 11, and the baffles 16 are arranged in parallel to form a curved flow channel inside the liquid ammonia heater shell 11; the heater heat exchange tube bundle 15 is respectively penetrated by the baffles 16; the design of the plurality of baffles 16 further extends the flow channel length of the shell-side medium, increases the inter-tube flow velocity and turbulence degree of the low-grade heat source, and achieves the purpose of improving the heat exchange effect of the primary heating mechanism 1; and the shell and tube heat exchanger in the embodiment of the present application is a horizontal structure, and the setting of the baffles 16 has a certain supporting effect on the heater heat exchange tube bundle 15; when the heater heat exchange tube bundle 15 is too long and bears too much compressive stress, the number of baffles 16 can be increased, and the spacing between the baffles 16 can be reduced, which can effectively alleviate the situation where the compressive stress of the heater heat exchange tube bundle 15 is too large, reduce the vibration of the heater heat exchange tube bundle 15 induced by fluid flow, and maintain the stability of the primary heating mechanism 1.

[0046] When the primary heating mechanism 1 preheats the liquid ammonia, the liquid ammonia is at least heated to above 0°C, thereby ensuring that the lowest temperature of the liquid ammonia entering the secondary evaporation mechanism 2 is above 0°C. This can ensure that when the secondary evaporation mechanism 2 is running at a low load or just started, the temperature of the heat source in the tube bundle is always maintained above 0°C before and after the heat exchange, so as to achieve the purpose of preventing ice and pipe blockage in the tube bundle; the design of the primary heating mechanism 1 is adopted, and the low-grade energy generated in the system or device of the coal-fired power plant itself is used to preheat the liquid ammonia, which reduces the energy consumption in the subsequent liquid ammonia evaporation process. At the same time, liquid ammonia is also used to cool the low-grade energy and recover the low-grade waste heat, which is an effective use of the liquid ammonia cold energy.

[0047] In this embodiment, in order to further heat and evaporate the liquid ammonia preheated by the primary heating mechanism 1 into ammonia gas and output it, the secondary evaporation mechanism 2 includes: a liquid ammonia evaporator shell 21, an evaporator joint 22, an evaporator heat exchange tube bundle 23, a delivery pipeline interface 24 and an ammonia gas outlet 25; the liquid ammonia evaporator shell 21 adopts a shell and tube heat exchanger compatible with the primary heating mechanism 1; the evaporator joint 22 is arranged on one side of the liquid ammonia evaporator shell 21, and is used to control the input / output of the high-grade heat source to / from the secondary evaporation mechanism 2; more The evaporator joint 22 includes a high-grade heat source input end 221 and a high-grade heat source output end 222; it can be understood that the high-grade heat source input end 221 and the high-grade heat source output end 222 are isolated from each other, each forming an independent accommodating space; the high-grade heat source input end 221 is connected to the high-grade heat source supply device; the high-grade heat source enters the secondary evaporation mechanism 2 from the high-grade heat source input end 221, and leaves the secondary evaporation mechanism 2 from the high-grade heat source output end 222 after the heat exchange with the liquid ammonia is completed.

[0048] The evaporator heat exchange tube bundle 23 is located in the liquid ammonia evaporator shell 21; in the present embodiment, the evaporator heat exchange tube bundle 23 is in a U-shaped structure, the feed end of which is connected to the high-grade heat source input end 221, and the discharge end of which is connected to the high-grade heat source output end 222; during the operation of the secondary evaporation mechanism 2, the liquid ammonia to be evaporated in the high-grade heat source input end 221 enters the evaporator heat exchange tube bundle 23 from the feed end of the evaporator heat exchange tube bundle 23, and after sufficient heat exchange with the liquid ammonia in the liquid ammonia evaporator shell 21, enters the high-grade heat source output end 222 from the discharge end of the evaporator heat exchange tube bundle 23.

[0049] In this embodiment, the delivery pipeline interface 24 is arranged at the bottom of the liquid ammonia evaporator shell 21, and the ammonia outlet 25 is arranged at the top of the liquid ammonia evaporator shell 21; the delivery pipeline interface 24 is connected to the liquid ammonia output end 142 through the delivery pipeline 143; with this technical solution, the liquid ammonia output by the primary heating mechanism 1 enters the liquid ammonia evaporator shell 21 through the delivery pipeline interface 24, and after the liquid ammonia exchanges heat with the high-grade heat source in the evaporator heat exchange tube bundle 23, it is vaporized into ammonia and leaves the secondary evaporation mechanism 2 from the ammonia outlet 25, thereby completing the entire liquid ammonia heating and evaporation process.

[0050] In the above technical solution, a plurality of support plates 26 are provided on the inner wall of the liquid ammonia evaporator shell 21, and the evaporator heat exchange tube bundles 23 are respectively penetrated on the support plates 26; the support plates 26 play the role of fixing the evaporator heat exchange tube bundles 23 in the liquid ammonia evaporator shell 21; the edge of the support plate 26 is provided with a flow channel hole 261 for passing liquid ammonia. This design allows the liquid ammonia to fill the bottom of the liquid ammonia evaporator shell 21 through the flow channel hole 261, and the liquid ammonia is in full contact with the evaporator heat exchange tube bundle 23, so that the gas production rate is improved.

[0051] In this embodiment, a heater bracket 17 is provided outside the liquid ammonia heater housing 11, and the primary heating mechanism 1 is fixed to the module frame or the ground foundation through the heater bracket 17; an evaporator bracket 27 is provided outside the liquid ammonia evaporator housing 21, and the evaporator bracket 27 and the heater bracket 17 are detachably fixed by means of bolt connection, and the secondary evaporation mechanism 2 is fixed above the primary heating mechanism 1 through the evaporator bracket 27 for installation and maintenance.

[0052] As a preferred embodiment of the present application, an arch is set in the area near the ammonia outlet 25 at the top of the liquid ammonia evaporator shell 21; with this design, the produced ammonia can be gathered near the ammonia outlet 25; in order to facilitate the monitoring of the operating parameters of the device, the top of the liquid ammonia evaporator shell 21 is provided with: a safety valve interface 211, a temperature measuring point interface 212 and a pressure measuring point interface 213, and a liquid level interface 214 is provided on one end face of the liquid ammonia evaporator shell 21; wherein, the safety valve interface 211 is used to connect an external safety valve, which plays a role of emergency pressure relief when the liquid ammonia evaporator shell 21 is over-pressured; the temperature measuring point interface 212 is connected to a thermal resistor, which is used to measure the temperature of the ammonia produced by evaporation; the pressure measuring point interface 213 is connected to an external pressure transmitter, which is used to measure the internal pressure value of the liquid ammonia evaporator shell 21; the liquid level interface 214 can be connected to a magnetic flap level gauge with a remote liquid level measurement function, which is used to measure the liquid ammonia level inside the liquid ammonia evaporator shell 21.

[0053] A two-stage heat recovery liquid ammonia evaporation device provided in the present application can be manufactured as a whole using carbon steel or stainless steel; as a preferred embodiment of the present application, the heater connector 14 is detachably connected to the liquid ammonia heater shell 11; the evaporator connector 22 is detachably connected to the liquid ammonia evaporator shell 21; with the above design, when the device is overhauled, the heater connector 14 together with the heater heat exchange tube bundle 15 can be taken out of the liquid ammonia heater shell 11 as a whole, and the evaporator connector 22 together with the evaporator heat exchange tube bundle 23 can be taken out of the liquid ammonia evaporator shell 21 as a whole.

[0054] The two-stage heat recovery liquid ammonia evaporation device provided in the present application divides the liquid ammonia heating and evaporation process into two stages by arranging a first-stage heating mechanism 1 and a second-stage evaporation mechanism 2 in series, which can effectively reduce the consumption of high-grade heat sources, recover a large amount of heat from low-grade heat sources, and make full use of the cold energy of liquid ammonia. It has the advantages of compact structure, small footprint, safe and stable operation, etc. At the same time, since the temperature of the liquid ammonia entering the second-stage evaporation mechanism 2 is relatively high, the steam condensate in the tube bundle will not freeze and block the tubes, and is suitable for large-flow liquid ammonia evaporation.

[0055] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A two-stage heat recovery liquid ammonia evaporation device, characterized in that: The two-stage heat recovery liquid ammonia evaporation device is connected to the low-grade heat source supply equipment and the high-grade heat source supply equipment; the two-stage heat recovery liquid ammonia evaporation device comprises: a primary heating mechanism and a secondary evaporation mechanism connected to one side of the primary heating mechanism; the secondary evaporation mechanism is used to heat and evaporate the liquid ammonia preheated by the primary heating mechanism into ammonia gas for output; Wherein, the first-level heating mechanism structure includes: Liquid ammonia heater housing; A low-grade heat source inlet, which is arranged at the bottom of the liquid ammonia heater shell and is connected to a low-grade heat source supply device; A low-grade heat source outlet, wherein the low-grade heat source outlet is arranged on the shell of the liquid ammonia heater; A heater connector, the heater connector is arranged on one side of the liquid ammonia heater housing; the heater connector includes a liquid ammonia input end and a liquid ammonia output end, the liquid ammonia input end and the liquid ammonia output end are isolated from each other; the liquid ammonia output end is connected to the secondary evaporation mechanism; A heater heat exchange tube bundle, wherein the heater heat exchange tube bundle is located in the liquid ammonia heater shell, and the feed end of the heater heat exchange tube bundle is connected to the liquid ammonia input end, and the discharge end of the heater heat exchange tube bundle is connected to the liquid ammonia output end.

2. A two-stage heat recovery liquid ammonia evaporation device according to claim 1, characterized in that: The secondary evaporation mechanism comprises: A liquid ammonia evaporator shell, wherein the liquid ammonia evaporator shell is a tank structure; An evaporator joint, the evaporator joint is arranged on one side of the liquid ammonia evaporator shell; the evaporator joint includes a high-grade heat source input end and a high-grade heat source output end, the high-grade heat source input end and the high-grade heat source output end are isolated from each other; the high-grade heat source input end is connected to a high-grade heat source supply device; An evaporator heat exchange tube bundle, wherein the evaporator heat exchange tube bundle is located in the liquid ammonia evaporator shell, and the feed end of the evaporator heat exchange tube bundle is connected to the high-grade heat source input end, and the discharge end of the evaporator heat exchange tube bundle is connected to the high-grade heat source output end; A delivery pipeline interface, wherein the delivery pipeline interface is arranged at the bottom of the liquid ammonia evaporator shell, the delivery pipeline interface is connected to a delivery pipeline, and the delivery pipeline interface is connected to the liquid ammonia output end through the delivery pipeline; An ammonia outlet is provided at the top of the liquid ammonia evaporator shell.

3. A two-stage heat recovery liquid ammonia evaporation device according to claim 1, characterized in that: A plurality of baffles are arranged on the inner wall of the shell of the liquid ammonia heater. The baffles are arranged in parallel, and the heat exchange tube bundles of the heater are respectively passed through the baffles.

4. A two-stage heat recovery liquid ammonia evaporation device according to claim 2, characterized in that: A plurality of support plates are arranged on the inner wall of the shell of the liquid ammonia evaporator. The edges of the support plates are provided with flow holes for passing liquid ammonia. The heat exchange tube bundles of the evaporator are respectively penetrated through the support plates.

5. A two-stage heat recovery liquid ammonia evaporation device according to claim 2, characterized in that: The top of the liquid ammonia evaporator shell is provided with: a safety valve interface, a temperature measuring point interface and a pressure measuring point interface; and one side of the liquid ammonia evaporator shell is provided with a liquid level interface.

6. A two-stage heat recovery liquid ammonia evaporation device according to claim 2, characterized in that: A heater bracket is provided outside the shell of the liquid ammonia heater; an evaporator bracket is provided outside the shell of the liquid ammonia evaporator, the evaporator bracket is connected to the heater bracket, and the secondary evaporation mechanism is fixed above the primary heating mechanism through the evaporator bracket.

7. A two-stage heat recovery liquid ammonia evaporation device according to claim 2, characterized in that: The heater connector is detachably connected to the liquid ammonia heater housing; the evaporator connector is detachably connected to the liquid ammonia evaporator housing.

Images