Hydrothermal vaporizer

Abstract

The utility model discloses a hydrothermal vaporizer which comprises a vaporizer and a temperature adjusting heat exchanger, the vaporizer is composed of a liquid gas section, an anti-freezing liquid section and a circulating water section which are connected through heat pipes for heat transfer; liquid gas is evaporated by the gasifier to form low-temperature gas which is then introduced into the temperature-adjusting heat exchanger to absorb heat, and normal-temperature gas is obtained and sent out. Normal-temperature circulating water is used as a secondary refrigerant to recycle the cold energy of liquid gas, the heat pipe is used for heat transfer, the heat transfer efficiency is high, the heat exchange temperature can be effectively controlled, the phenomenon that the vaporizer is damaged due to supercooling condensation of the circulating water is avoided, and the circulating water can be directly used as a heat source; through comprehensive utilization of waste heat and free cooling capacity of common low-grade circulating water in production, the energy utilization rate is effectively improved, and energy conservation and consumption reduction are achieved.

Description

Technical Field

[0001] The utility model relates to the field of cooling equipment, and particularly relates to a hydrothermal gasifier. Background Art

[0002] During the gasification process of liquid gas, a large amount of cold energy is often released. Taking liquid nitrogen as an example, its gasification temperature is about -170°C under a pressure of 0.7MPaG. The currently widely used air-cooled gasifier uses air as a heat source to exchange heat with liquid gas, and the cold energy is released into the air without being effectively utilized. At the same time, frosting will occur after the gasifier is used for a long time, and the frosting situation is most significant near the inlet, seriously affecting the working efficiency of the gasifier. In a high-humidity environment, this situation will deteriorate further. For the hydrothermal gasifier, due to the too low temperature of the cold source, it has strict requirements on the water temperature, usually requiring not less than 80°C, consuming a large amount of high-grade heat, and having too high a cost. Summary of the Utility Model

[0003] Purpose of the utility model: Aiming at the above problems, the purpose of the utility model is to provide a hydrothermal gasifier, which matches and comprehensively utilizes the common low-grade waste heat and free cold energy in production, effectively improves the energy utilization rate, and realizes energy conservation and consumption reduction.

[0004] Technical solution: The hydrothermal gasifier of the utility model includes a gasifier and a temperature-regulating heat exchanger. The gasifier is connected to the temperature-regulating heat exchanger through a gas pipeline and a circulating water pipeline.

[0005] The gasifier is composed of three parts: a liquid gas section, an antifreeze section, and a cooling water section from top to bottom. The liquid gas section and the antifreeze section, as well as the antifreeze section and the cooling water section, are separated by a heat insulation layer. A low-temperature heat pipe is arranged between the cooling water section and the antifreeze section for heat transfer, and a deep cryogenic heat pipe is arranged between the antifreeze section and the liquid gas section for heat transfer. Baffle plates are arranged in the liquid gas section.

[0006] Two-stage heat exchange is realized through the cooperation of the deep cryogenic heat pipe and the low-temperature heat pipe, improving the heat exchange efficiency.

[0007] Further, a first automatic regulating valve is arranged at the liquid gas inlet of the gasifier, and a first remote temperature gauge is arranged on the gas pipeline between the gasifier and the gas-side inlet of the temperature-regulating heat exchanger. The first remote temperature gauge is electrically connected to the first automatic regulating valve to control the valve opening according to the temperature.

[0008] Further, a second automatic regulating valve is arranged at the water inlet of the gasifier, and a second remote temperature gauge and a temperature control valve are sequentially arranged on the circulating water pipeline between the water outlet of the gasifier and the water-side inlet of the temperature-regulating heat exchanger. The second remote temperature gauge is electrically connected to the second automatic regulating valve to control the valve opening according to the temperature.

[0009] Further, a cross - connecting pipeline is provided between the water - side inlet of the temperature - regulating heat exchanger and the circulating water inlet, and a third automatic regulating valve is arranged on the cross - connecting pipeline. A third remote - transmitting thermometer is arranged at the gas - side outlet of the temperature - regulating heat exchanger, and the third remote - transmitting thermometer is electrically connected to the third automatic regulating valve to control the valve opening according to the temperature.

[0010] Further, port A of the temperature - control valve is connected to the water - side outlet of the temperature - regulating heat exchanger through a cross - connection, and port B is connected to the water - side inlet of the temperature - regulating heat exchanger.

[0011] Beneficial effects: Compared with the prior art, the remarkable advantages of the present utility model are as follows:

[0012] The present utility model can collect the cold quantity dissipated by the vaporizer and use it for cooling the circulating water, as a supplement to the cooling tower or the refrigeration unit, reducing energy consumption; using heat pipes for heat transfer can effectively control the temperatures at both the cold and hot ends, preventing the circulating water as the coolant from freezing and causing damage to the heat exchanger; automatically adjusting the valves at all levels according to the gas and circulating water temperatures to control the flow rates of the circulating water and the liquid gas, ensuring stable operation of the system, making full use of the cold quantity generated by the vaporization of the liquid gas while meeting the requirements for the outlet temperatures of the circulating water and the gas; using a two - stage heat - exchange scheme with deep - cold heat pipes and low - temperature heat pipes in cooperation to solve the problem of excessive temperature difference between the cold and hot ends, making the heat exchange more sufficient and improving the heat - exchange efficiency; using a temperature - control valve to adjust the water - volume distribution at the inlet of the temperature - regulating heat exchanger to ensure full utilization of the cold quantity, avoiding waste of cold quantity caused by excessive cooling of the circulating water and the risk of possible freezing accidents. Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of the heat - pipe low - temperature water - heat vaporizer in the present utility model;

[0014] Figure 2 is a schematic structural diagram of the heat pipe in the present utility model.

[0015] Wherein: 1 first remote - transmitting thermometer, 2 vaporizer, 3 liquid - gas section, 4 deep - cold heat pipe, 5 baffle plate, 6 first automatic regulating valve, 7 antifreeze section, 8 heat - insulating layer, 9 cooling - water section, 10 low - temperature heat pipe, 11 second automatic regulating valve, 12 third automatic regulating valve, 13 third remote - transmitting thermometer, 14 temperature - regulating heat exchanger, 15 temperature - control valve, 16 second remote - transmitting thermometer, 17 cross - connecting pipeline, 18 cold end, 19 heat - exchange fins, 20 heat - transfer medium, 21 hot end. Detailed Embodiments

[0016] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments.

[0017] As Figure 1As shown in the figure, the hydrothermal gasifier of the present utility model includes a gasifier 2 and a temperature regulating heat exchanger 14. The gasifier 2 is provided with a liquid gas inlet, a gas outlet, a water inlet and a water outlet. The gas outlet of the gasifier 2 is connected to the temperature regulating heat exchanger 14 through a gas pipeline, and the water outlet of the gasifier 2 is connected to the temperature regulating heat exchanger 14 through a circulating water pipeline. The gasifier 2 is composed of three parts: a liquid gas section 3, an antifreeze section 7 and a cooling water section 9 from top to bottom, which are separated by a heat insulation layer 8 in between. A low-temperature heat pipe 10 is arranged between the cooling water section 9 and the antifreeze section 7 for heat transfer, and a deep cryogenic heat pipe 4 is arranged between the antifreeze section 7 and the liquid gas section 3 for heat transfer. The low-temperature heat pipe 10 and the deep cryogenic heat pipe 4 have the same structure as Figure 2 shown. The upper part of the heat pipe is the cold end 18, and the lower part is the hot end 21. Heat exchange fins 19 are arranged at both the cold and hot ends to increase the heat exchange area and efficiency. Different types of heat transfer media 20 are filled in the heat pipe according to different temperatures. The heat transfer media 20 absorbs heat and evaporates at the hot end 21 and flows upward to the cold end 18, and then releases heat and condenses into a liquid state and flows back to the hot end 21 along the wall under the action of gravity to complete the directional transfer of heat.

[0018] When the equipment is working, the liquid gas enters the gasifier 2 from the liquid gas inlet, passes through the baffle plate 5 repeatedly in the liquid gas section 3 and exchanges heat fully with the deep cryogenic heat pipe 4. After releasing most of the cold energy, it is gasified into a low-temperature gas and enters the temperature regulating heat exchanger 14 through the pipeline from the upper gas outlet to adjust the temperature. After releasing the remaining cold energy, it becomes a normal-temperature gas that meets the use requirements and is output through the gas outlet. The temperature regulating heat exchanger 14 can adopt a common shell-and-tube steam-water heat exchanger on the market, with the gas flowing through the tubes and the water flowing through the shell.

[0019] The circulating water is divided into two paths. One path enters the cooling water section 9 from the lower part of the gasifier 2, receives the cold energy transferred by the low-temperature heat pipe 10, cools down and precools, and then flows out of the gasifier 2. After passing through the temperature control valve 15 for water volume distribution, it enters the temperature regulating heat exchanger 14 from port B or is directly sent to the circulating water outlet from port A. The other path passes through the cross-connecting pipeline 17 and converges with the precooled water flowing out of port B of the temperature control valve 15, flows into the temperature regulating heat exchanger 14, further absorbs the cold energy of the low-temperature gas, and then is sent to the circulating water outlet.

[0020] The water volume distribution of the temperature control valve 15 needs to be set according to the design parameters of the circulating water system. Let the designed supply water temperature of the circulating water be t 1 , and the designed return water temperature be t 2 . When the water temperature t ≤ t 1 , port B of the temperature control valve 15 is closed, and all the circulating water flows out from port A; when the water temperature t ≥ t 2 , port A is closed, and all the circulating water flows out from port B; when t 1 <t<t 2 , circulating water flows out from both port A and port B, and as the temperature t increases, the flow rate of port A gradually transfers to port B.

[0021] The heat pipe low-temperature hydrothermal gasifier is provided with three groups of automatic control devices, which are composed of automatic regulating valves and remote temperature gauges. The remote temperature gauges are electrically connected to the automatic regulating valves, and the valves are controlled according to the temperature to form a closed-loop feedback regulation. The specific configuration is as follows: The first group: a first automatic regulating valve 6 is arranged at the liquid gas inlet of the gasifier 2, and a first remote temperature gauge 1 is arranged on the gas pipeline between the gas outlet of the gasifier 2 and the gas-side inlet of the temperature regulating heat exchanger 14; The second group: a second automatic regulating valve 11 is arranged at the water inlet of the gasifier 2, and a second remote temperature gauge 16 is arranged between the water outlet of the gasifier 2 and the temperature control valve 15; The third group: a third automatic regulating valve 12 is arranged on the cross-connecting pipeline 17, and a third remote temperature gauge 13 is arranged at the gas-side outlet of the temperature regulating heat exchanger 14. Specifically, in this embodiment, the control logic is:

[0022] O=k*(T-T 0 )

[0023] In the formula, O is the opening change value of the regulating valve (positive for increase, negative for decrease), k is the coefficient constant value (k takes a positive value for regulating the gas valve opening and a negative value for regulating the water valve opening), T is the temperature value obtained by the temperature gauge, and T 0 is the set target temperature value. The automatic regulating valve automatically adjusts the valve opening according to the temperature value measured by the remote temperature gauge, and the difference between the measured value and the target value is positively correlated with the change range of the valve opening.

[0024] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0025] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art in the technical field, without departing from the technical principle of the present invention, several improvements and deformations can still be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. Hydrothermal gasifier, characterized in that: It comprises a gasifier (2) and a temperature-regulating heat exchanger (14), wherein the gasifier (2) is connected to the temperature-regulating heat exchanger (14) via a gas pipeline and a circulating water pipeline; The vaporizer (2) is composed of three parts from top to bottom, namely, a liquid gas section (3), an antifreeze liquid section (7) and a cooling water section (9); the liquid gas section (3) and the antifreeze liquid section (7) as well as the antifreeze liquid section (7) and the cooling water section (9) are separated by a heat insulation layer (8); a low-temperature heat pipe (10) is provided between the cooling water section (9) and the antifreeze liquid section (7) for heat transfer; a deep cold heat pipe (4) is provided between the antifreeze liquid section (7) and the liquid gas section (3) for heat transfer; and a baffle (5) is provided in the liquid gas section (3); The two-stage heat exchange is achieved by cooperating with the deep cold heat pipe and the low temperature heat pipe to improve the heat exchange efficiency.

2. The hydrothermal gasifier according to claim 1, characterized in that: A first automatic regulating valve (6) is provided at the liquid gas inlet of the vaporizer (2), and a first remote temperature meter (1) is provided on the gas pipeline between the vaporizer (2) and the gas side inlet of the temperature regulating heat exchanger (14). The first remote temperature meter (1) is electrically connected to the first automatic regulating valve (6) to control the valve opening according to the temperature.

3. The hydrothermal gasifier according to claim 1, characterized in that: The vaporizer (2) is provided with a second automatic regulating valve (11) at the water inlet, and a second remote temperature meter (16) and a temperature control valve (15) are sequentially provided on the circulating water pipeline between the water outlet of the vaporizer (2) and the water side inlet of the temperature regulating heat exchanger (14), and the second remote temperature meter (16) is electrically connected to the second automatic regulating valve (11) to control the valve opening according to the temperature.

4. The hydrothermal gasifier according to claim 1, characterized in that: The water side inlet of the temperature-regulating heat exchanger (14) is connected to the circulating water inlet via a jumper pipe (17), a third automatic regulating valve (12) is arranged on the jumper pipe (17), a third remote temperature meter (13) is arranged at the gas side outlet of the temperature-regulating heat exchanger (14), the third remote temperature meter (13) is electrically connected to the third automatic regulating valve (12), and the valve opening is controlled according to the temperature.

5. The hydrothermal gasifier according to claim 3, characterized in that: The port A of the temperature control valve (15) is connected to the water side outlet of the temperature regulating heat exchanger (14) through a jumper, and the port B is connected to the water side inlet of the temperature regulating heat exchanger (14).

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