Multi-heat source ammonia vaporizer

Abstract

The present application relates to a kind of multi-heat source heating liquid ammonia evaporator, including evaporator shell, multiple heat exchange tubes, liquid ammonia heat exchange inlet and outlet pipe, heat medium inlet and outlet pipe, multiple electric heating rods, two tube sheets, two tube boxes, first and second tube sheets are respectively sealed with the front and rear through holes of evaporator shell Connection, each heat exchange tube is horizontally arranged between two tube sheets and its front and rear ends are respectively sealed with two tube sheets Connection;Two tube sheets are divided into upper non-electric heating area and lower electric heating area, and the electric heating rod is inserted in the heat exchange tube arranged in the electric heating area, and the first and second tube sheets of non-electric heating area are respectively sealed with the first and second tube boxes Connection, so that the ends of heat exchange tube arranged in non-electric heating area are communicated with the first and second tube boxes;Heat medium inlet and outlet pipe are respectively connected to the first and second tube boxes, and liquid ammonia heat exchange outlet and inlet pipe are respectively connected to the upper and lower parts of evaporator shell.The liquid ammonia evaporator can improve the liquid ammonia evaporation effect, and the structure is compact and small in size.

Description

Technical Field

[0001] This invention relates to the field of evaporator technology, and more specifically to a multi-heat-source heated liquid ammonia evaporator. Background Technology

[0002] Steam generation systems are indispensable in the fields of efficient and clean renewable energy utilization, such as concentrated solar power (CSP), waste heat recovery, and energy storage. The evaporator is the core equipment of the steam generation system and is crucial for ensuring the performance and reliability of the entire system. Liquid ammonia evaporators, specifically shell-and-tube evaporators, are one of the important components of liquid ammonia evaporation systems. Traditional liquid ammonia evaporators have a single heat source, low evaporation efficiency, and rely on indirect heating during operation. This results in insufficient heat absorption by the liquid ammonia, short heat exchange time, and low heat transfer rate, leading to incomplete evaporation of the liquid ammonia. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-heat source heated liquid ammonia evaporator, which can improve the liquid ammonia evaporation effect and has a compact structure and small size.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a multi-heat-source heated liquid ammonia evaporator, comprising an evaporator shell, multiple heat exchange tubes, a liquid ammonia heat exchange inlet pipe, a liquid ammonia heat exchange outlet pipe, a heat medium inlet pipe, a heat medium outlet pipe, multiple electric heating rods, a first tube sheet, a second tube sheet, a first tube box, and a second tube box. The first tube sheet and the second tube sheet are respectively sealed and connected to the front and rear through holes of the evaporator shell. Each heat exchange tube is horizontally inserted between the first tube sheet and the second tube sheet, and its front and rear ends are respectively sealed and connected to the first tube sheet and the second tube sheet. Thus, within the area enclosed by the evaporator shell, the first tube sheet, the second tube sheet, and the heat exchange tubes... An evaporation chamber is formed in the space; the first tube sheet and the second tube sheet are divided into upper and lower parts, the upper part is a non-electric heating zone and the lower part is an electric heating zone. Electric heating rods are inserted into the heat exchange tubes passing through the electric heating zone. The first tube sheet and the second tube sheet in the non-electric heating zone are matched and sealed with the rear opening surface of the first tube box and the front opening surface of the second tube box, respectively, so that the two ends of the heat exchange tubes passing through the non-electric heating zone are connected to the first tube box and the second tube box; the heat medium inlet pipe and the heat medium outlet pipe are respectively connected to the first tube box and the second tube box, and the liquid ammonia heat exchange outlet pipe and the liquid ammonia heat exchange inlet pipe are respectively connected to the upper and lower parts of the evaporator shell.

[0005] Furthermore, baffles are alternately and horizontally arranged at different heights on the rear end face of the first tube sheet and the front end face of the second tube sheet, thereby forming a back-and-forth flow channel in the evaporation chamber.

[0006] Furthermore, the liquid ammonia heat exchange inlet pipe is located on the evaporator shell on the same side of the tube sheet where the bottom baffle is located; the liquid ammonia heat exchange outlet pipe is located on the same side of the evaporator shell where the top baffle is located.

[0007] Furthermore, the multiple heat exchange tubes are evenly arranged inside the evaporation chamber.

[0008] Furthermore, the heat medium inlet pipe is connected to the upper end face of the first pipe box and is in communication with the first pipe box, and the axis of the heat medium inlet pipe is perpendicular to the axis of the heat exchange tube; the heat medium outlet pipe is connected to the rear end face of the second pipe box and is in communication with the second pipe box, and the axis of the heat medium outlet pipe is parallel to the axis of the heat exchange tube.

[0009] Furthermore, all heat exchange tubes are made of thin-walled, high-temperature resistant stainless steel.

[0010] Furthermore, the connections between the evaporator shell and the first tube sheet, the second tube sheet liquid ammonia heat exchange outlet pipe, and the liquid ammonia heat exchange inlet pipe, the connections between the heat exchange tubes and the first tube sheet and the second tube sheet, the connections between the first tube box and the first tube sheet and the heat medium inlet pipe, and the connections between the second tube box and the second tube sheet and the heat medium outlet pipe are all welded connections to ensure the sealing of the connections.

[0011] Compared with existing technologies, the present invention has the following advantages: The present invention innovatively designs a liquid ammonia evaporator that can heat liquid ammonia through multiple heat sources. This liquid ammonia evaporator adds electric heating to the traditional heat exchange medium to provide an additional heat source. When the external heat source is insufficient or the initial operating heat is insufficient, the heat demand for liquid ammonia evaporation can be met by electric heating, effectively solving the problem of low liquid ammonia evaporation rate in traditional liquid ammonia evaporators with a single heat source. The heating source of this liquid ammonia evaporator is stable, the evaporation effect is good, and the structure is simple, compact, and small in overall size, which has strong practicality and broad application prospects. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a multi-heat-source heated liquid ammonia evaporator according to an embodiment of the present invention; Figure 2 This is a side sectional view of a multi-heat-source heated liquid ammonia evaporator according to an embodiment of the present invention. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0015] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0016] like Figure 1 As shown, this embodiment provides a multi-heat-source heated liquid ammonia evaporator, including an evaporator shell 1, multiple heat exchange tubes 2, a liquid ammonia heat exchange inlet pipe 3, a liquid ammonia heat exchange outlet pipe 4, a heat medium inlet pipe 5, a heat medium outlet pipe 6, multiple electric heating rods 7, a first tube sheet 8, a second tube sheet 9, a first tube box a, and a second tube box c. The first tube sheet 8 and the second tube sheet 9 are respectively sealed and connected to the front and rear through holes of the evaporator shell 1. Each heat exchange tube 2 is horizontally inserted between the first tube sheet 8 and the second tube sheet 9, and its front and rear ends are respectively sealed and connected to the first tube sheet 8 and the second tube sheet 9, thereby forming a space enclosed by the evaporator shell 1, the first tube sheet 8, the second tube sheet 9, and the heat exchange tubes 2. Evaporation chamber b; the first tube sheet 8 and the second tube sheet 9 are divided into upper and lower parts, the upper part is a non-electric heating zone and the lower part is an electric heating zone. An electric heating rod 7 is inserted in the heat exchange tube 2 passing through the electric heating zone. The first tube sheet 8 and the second tube sheet 9 in the non-electric heating zone are matched and sealed with the rear opening surface of the first tube box a and the front opening surface of the second tube box c, respectively, so that the two ends of the heat exchange tube 2 passing through the non-electric heating zone are connected to the first tube box a and the second tube box c. The heat medium inlet pipe 5 and the heat medium outlet pipe 6 are respectively connected to the first tube box a and the second tube box c. The liquid ammonia heat exchange outlet pipe 4 and the liquid ammonia heat exchange inlet pipe 3 are respectively connected to the upper and lower parts of the evaporator shell 1.

[0017] The multi-heat-source heated liquid ammonia evaporator in this embodiment uses an innovative structural design to divide the evaporator into two areas: an electric heating zone and a non-electric heating zone. In the electric heating zone, an electric heating rod is inserted into the heat exchange tube as the first heating source, while in the non-electric heating zone, a high-temperature heat medium flows through the heat exchange tube as the second heating source. This effectively solves the problem of insufficient heat and low liquid ammonia evaporation rate in traditional single-heat-source liquid ammonia evaporators during the initial operation of the system.

[0018] In this embodiment, baffles 11 are alternately and horizontally arranged at different heights on the rear end face of the first tube sheet 8 and the front end face of the second tube sheet 9, thereby forming a back-and-forth flow channel in the evaporation chamber. By setting baffles 11 in the evaporation chamber b, after liquid ammonia enters from the liquid ammonia heat exchange inlet pipe 3, it flows back and forth in the evaporation chamber b and evaporates, and finally flows out from the liquid ammonia heat exchange outlet pipe 4, which increases the heat absorption time of liquid ammonia in the evaporation chamber, making the liquid ammonia evaporate more completely and improving the evaporation rate. In order to ensure that the bottom baffle and the top baffle are effectively utilized, the liquid ammonia heat exchange inlet pipe 3 is set on the evaporator shell 1 on the same side of the tube sheet where the bottom baffle is located; the liquid ammonia heat exchange outlet pipe 4 is set on the evaporator shell 1 on the same side of the tube sheet where the top baffle is located.

[0019] In this embodiment, the multiple heat exchange tubes 2 are evenly arranged in the evaporation chamber to ensure that the liquid ammonia is heated fully and evenly.

[0020] In this embodiment, the heat medium inlet pipe 5 is connected to the upper end face of the first pipe box a and is in communication with the first pipe box a, and the axis of the heat medium inlet pipe 5 is perpendicular to the axis of the heat exchange pipe 2; the heat medium outlet pipe 6 is connected to the rear end face of the second pipe box c and is in communication with the second pipe box c, and the axis of the heat medium outlet pipe 6 is parallel to the axis of the heat exchange pipe 2. This structural design avoids uneven heat conduction and insufficient heat transfer time in the evaporation chamber caused by the rapid flow of the heat medium into the evaporator heat exchange pipes along part of the heat exchange pipe path, ensuring that the heat transfer and flow rate distribution of the heat medium in each internal heat exchange pipe are approximately equal.

[0021] In this embodiment, all heat exchange tubes 2 are made of thin-walled, high-temperature resistant stainless steel, which effectively reduces heat loss during wall heat transfer and improves the evaporation efficiency of the evaporator. Preferably, the heat exchange tubes 2 are made of DN18, 2mm thick, thin-walled 310s stainless steel.

[0022] In this embodiment, the connections between the evaporator shell 1 and the first tube sheet 8, the second tube sheet 9, the liquid ammonia heat exchange outlet pipe 4, and the liquid ammonia heat exchange inlet pipe 3, the connections between the heat exchange tube 2 and the first tube sheet 8 and the second tube sheet 9, the connections between the first tube box a and the first tube sheet 8 and the heat medium inlet pipe 5, and the connections between the second tube box c and the second tube sheet 9 and the heat medium outlet pipe 6 are all welded connections. This effectively ensures the airtightness of the entire evaporator, increases the service life of the evaporator, and ensures the stability of the evaporator's heat exchange efficiency.

[0023] In addition, the liquid ammonia heat exchanger inlet pipe 3, liquid ammonia heat exchanger outlet pipe 4, heat medium inlet pipe 5, and heat medium outlet pipe 6 are all equipped with connecting flanges, which are connected to external pipes by means of flanges and bolts, making operation convenient.

[0024] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A multi-heat source heated liquid ammonia evaporator, characterized in that, The evaporator includes an evaporator shell (1), multiple heat exchange tubes (2), a liquid ammonia heat exchange inlet pipe (3), a liquid ammonia heat exchange outlet pipe (4), a heat medium inlet pipe (5), a heat medium outlet pipe (6), multiple electric heating rods (7), a first tube sheet (8), a second tube sheet (9), a first tube box (a), and a second tube box (c). The first tube sheet (8) and the second tube sheet (9) are respectively sealed and connected to the front and rear through holes of the evaporator shell (1). Each heat exchange tube (2) is horizontally inserted between the first tube sheet (8) and the second tube sheet (9), and its front and rear ends are respectively sealed and connected to the first tube sheet (8) and the second tube sheet (9), thereby forming an evaporation chamber (b) in the space enclosed by the evaporator shell (1), the first tube sheet (8), the second tube sheet (9), and the heat exchange tubes (2). The first tube sheet (8) and the second tube sheet (9) are divided into upper and lower parts. The upper part is a non-electric heating zone and the lower part is an electric heating zone. An electric heating rod (7) is inserted in the heat exchange tube (2) that passes through the electric heating zone. The first tube sheet (8) and the second tube sheet (9) in the non-electric heating zone are matched and sealed with the rear opening surface of the first tube box (a) and the front opening surface of the second tube box (c) respectively, so that the two ends of the heat exchange tube (2) that passes through the non-electric heating zone are connected to the first tube box (a) and the second tube box (c). The heat medium inlet pipe (5) and the heat medium outlet pipe (6) are respectively connected to the first tube box (a) and the second tube box (c). The liquid ammonia heat exchange outlet pipe (4) and the liquid ammonia heat exchange inlet pipe (3) are respectively connected to the upper and lower parts of the evaporator shell (1). The rear end face of the first tube sheet (8) and the front end face of the second tube sheet (9) are alternately horizontally arranged with baffles (10) at different heights, thereby forming a back-and-forth flow channel in the evaporation chamber; The liquid ammonia heat exchange inlet pipe (3) is installed on the evaporator shell (1) on the same side as the tube sheet where the bottom baffle is located; the liquid ammonia heat exchange outlet pipe (4) is installed on the evaporator shell (1) on the same side as the tube sheet where the top baffle is located. The multiple heat exchange tubes (2) are evenly arranged in the evaporation chamber; The heat medium inlet pipe (5) is connected to the upper end face of the first pipe box (a) and is in communication with the first pipe box (a), and the axis of the heat medium inlet pipe (5) is perpendicular to the axis of the heat exchange pipe (2); the heat medium outlet pipe (6) is connected to the rear end face of the second pipe box (c) and is in communication with the second pipe box (c), and the axis of the heat medium outlet pipe (6) is parallel to the axis of the heat exchange pipe (2); All heat exchange tubes (2) are made of thin-walled high-temperature resistant stainless steel. The connections between the evaporator shell (1) and the first tube sheet (8), the second tube sheet (9), the liquid ammonia heat exchange outlet pipe (4), and the liquid ammonia heat exchange inlet pipe (3), the connection between the heat exchange tube (2) and the first tube sheet (8) and the second tube sheet (9), the connection between the first tube box (a) and the first tube sheet (8) and the heat medium inlet pipe (5), and the connection between the second tube box (c) and the second tube sheet (9) and the heat medium outlet pipe (6) are all welded to ensure the sealing of the connections.

Images