CN211345956U - Liquefied natural gas cold energy ice making device - Google Patents
Liquefied natural gas cold energy ice making device Download PDFInfo
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- CN211345956U CN211345956U CN201921740541.2U CN201921740541U CN211345956U CN 211345956 U CN211345956 U CN 211345956U CN 201921740541 U CN201921740541 U CN 201921740541U CN 211345956 U CN211345956 U CN 211345956U
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- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 61
- 239000003507 refrigerant Substances 0.000 claims abstract description 153
- 238000003860 storage Methods 0.000 claims abstract description 36
- 238000002309 gasification Methods 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000007789 gas Substances 0.000 claims abstract description 21
- 230000001105 regulatory effect Effects 0.000 claims description 15
- 239000006200 vaporizer Substances 0.000 claims description 7
- 230000008016 vaporization Effects 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 2
- 239000012074 organic phase Substances 0.000 claims 1
- 238000009834 vaporization Methods 0.000 claims 1
- 238000001816 cooling Methods 0.000 abstract description 7
- 238000001704 evaporation Methods 0.000 abstract description 6
- 230000008020 evaporation Effects 0.000 abstract description 6
- 239000007788 liquid Substances 0.000 abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 238000003723 Smelting Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000000498 cooling water Substances 0.000 description 5
- 239000003345 natural gas Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The application discloses a liquefied natural gas cold energy ice making device which comprises a liquefied natural gas gasification heat exchange system, a refrigerant circulating system and an ice making system; the liquefied natural gas gasification heat exchange system comprises a gas storage tank, a gasification second branch and gas utilization equipment; the gasification second branch comprises a second low-temperature valve, a condenser and a second gasifier which are connected in sequence; the refrigerant circulating system comprises a condenser, a refrigerant storage tank, a refrigerant pump and a refrigerant circulating first branch circuit; the first branch of the refrigerant cycle comprises a first evaporator; the ice making system comprises a first water inlet pipe and a first ice making machine; the first ice maker is in heat transfer contact with the first evaporator. The refrigerant is liquefied into liquid after being cooled in the condenser, the liquid is stored in the refrigerant storage tank and is input to the first evaporator through the refrigerant pump for evaporation, and the refrigerant absorbs heat during evaporation to enable water in the first ice maker in heat conduction contact with the first evaporator to be solidified into ice blocks, so that the effective utilization of the liquefied natural gas cooling energy is realized.
Description
Technical Field
The application relates to liquefied natural gas cold energy recycle field especially relates to liquefied natural gas cold energy ice making device.
Background
Production factories such as metal smelting need to use Liquefied Natural Gas (LNG) as fuel in the production process, and LNG needs to be gasified and heated in an LNG gasification station before entering a natural gas pipe network to release about 830kJ/kg of cold energy.
However, in the production process of metal smelting and the like, the cold energy released by LNG is not effectively utilized, and the cold energy is wasted.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a liquefied natural gas cold energy ice making device, and aims to solve the problem that in the prior art, in the production process of metal smelting and the like, the cold energy released by LNG is not effectively utilized.
To achieve the purpose, the following technical scheme is adopted in the application:
the liquefied natural gas cold energy ice making device comprises a liquefied natural gas gasification heat exchange system, a refrigerant circulating system and an ice making system; the liquefied natural gas gasification heat exchange system comprises a gas storage tank, a gasification second branch and gas utilization equipment; the gasification second branch comprises a second low-temperature valve, a condenser and a second gasifier which are sequentially connected; one end of the second low-temperature valve, which is far away from the condenser, is connected with the gas storage tank, and one side of the second gasifier, which is far away from the condenser, is connected with the gas-using equipment; the refrigerant circulating system comprises the condenser, a refrigerant storage tank connected with the condenser, a refrigerant pump connected with the refrigerant storage tank, and a refrigerant circulating first branch circuit connected with the refrigerant pump; the first branch of the refrigerant cycle comprises a first evaporator connected to the refrigerant pump; the ice making system comprises a first water inlet pipe and a first ice making machine connected with the first water inlet pipe; the first ice maker is in thermally conductive contact with the first evaporator.
Further, the liquefied natural gas gasification heat exchange system also comprises a gasification first branch which is connected with the gasification second branch in parallel; the first gasification branch comprises a first low-temperature valve connected with the gas storage tank and a first gasifier connected with the first low-temperature valve; the first gasifier is connected with the gas-using equipment.
Further, the first branch of the refrigerant cycle further comprises a first refrigerant inlet regulating valve arranged between the refrigerant pump and the first evaporator.
Further, the refrigerant circulating system further comprises a refrigerant buffer tank connected with the first evaporator, and a refrigerant outlet valve arranged between the refrigerant buffer tank and the condenser.
Further, the refrigerant cycle system further comprises a refrigerant cycle second branch connected in parallel with the refrigerant cycle first branch; the refrigerant circulation second branch comprises a second refrigerant inlet regulating valve connected with the refrigerant pump and a second evaporator connected with the second refrigerant inlet regulating valve; and one side of the second evaporator, which is far away from the second refrigerant inlet regulating valve, is connected with the refrigerant buffer tank.
Further, the refrigerant cycle system further includes a refrigerant cycle bypass branch connected in parallel with the refrigerant cycle first branch; the refrigerant circulation bypass branch comprises a refrigerant bypass adjusting valve connected with the refrigerant pump; the refrigerant bypass adjusting valve is connected with one side of the condenser, which is far away from the refrigerant storage tank.
Furthermore, the ice making system also comprises a second water inlet pipe which is connected with the first water inlet pipe in parallel, and a second ice maker which is connected with the second water inlet pipe; the second ice maker is in thermally conductive contact with the second evaporator.
Further, the condenser is a wound tube heat exchanger or a U-shaped tube heat exchanger.
Further, the refrigerant storage tank is a heat-preservation pressure container, and an organic phase-change refrigerant is arranged in the refrigerant storage tank; the bottom of the refrigerant storage tank is connected with the refrigerant pump.
Further, the first gasifier and the second gasifier are both air-temperature gasifiers.
The beneficial effect of this application: the liquefied natural gas is subjected to heat exchange with a refrigerant in the refrigerant circulating system at the condenser, then the temperature is raised to 0 ℃, and then the liquefied natural gas enters the second gasifier for heating and finally enters a downstream natural gas pipeline for use by gas equipment. The refrigerant in the refrigerant circulating system is liquefied into liquid after being cooled in the condenser, the liquid is stored in the refrigerant storage tank and is input to the first evaporator through the refrigerant pump for evaporation, the refrigerant absorbs heat during evaporation to enable water in the first ice maker in heat conduction contact with the first evaporator to be solidified into ice blocks, and the ice blocks are separated and then transported into a factory building for cooling, so that the working environment of the factory building is improved; or put into a cooling water tank to replace a cooling water tower, so that the energy consumption is reduced, and the effective utilization of the liquefied natural gas is realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of an apparatus for making ice from cold energy of liquefied natural gas;
in the figure:
1. a gas storage tank; 2. a first cryogenic valve; 3. a second cryogenic valve; 4. a first vaporizer; 5. a second vaporizer; 6. a gas using device; 7. a condenser; 8. a refrigerant storage tank; 9. a refrigerant pump; 10. a refrigerant bypass regulating valve; 11. a first refrigerant inlet regulating valve; 12. a second refrigerant inlet regulating valve; 13. a first evaporator; 14. a second evaporator; 15. a refrigerant buffer tank; 16. a refrigerant outlet valve; 17. a first water inlet pipe; 18. A second water inlet pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Liquefied Natural Gas (LNG) is used as fuel in the production process of a metal smelting plant, the LNG needs to be gasified and heated in an LNG gasification station before entering a natural gas pipe network, the cold energy of about 830kJ/kg is released and absorbed by an air-temperature type gasifier in the gasification station, if the cold energy is utilized, theoretically, if the cold energy is converted into electric energy of about 240 kW.h/t, and therefore the energy-saving value of cold energy utilization of large-scale LNG users is considerable.
There are many ways of utilizing the cold energy of LNG, mainly including: low-temperature power generation, air separation, low-temperature refrigeration, raw and cold crushing of waste rubber, air inlet cooling technology of a gas turbine and the like.
The inventor finds that a large amount of cold using requirements exist in a plant area of a metal smelting plant, the ambient temperature of a workshop is too high in summer, and the effect is not obvious due to the adoption of a fan or a cold water fan for cooling; the factory needs to consume a large amount of water for equipment cooling every day, needs a cooling tower to circulate, and consumes electric energy. If LNG cold energy in the vaporizing station is used for plant refrigeration, a large amount of electric energy can be saved, the working conditions of workers and equipment are improved, and good economic and production benefits are realized.
Through investigation and analysis of the LNG storage gasification area and the plant area of the metal smelting plant, the site condition is considered to be very suitable for making ice by utilizing the LNG cold energy. The cold demand of the factory is large, the ice blocks can be made and then put into the operation area to cool the cold water fan, or directly put into the cooling water pool, and the ice blocks are completely produced and sold.
The following detailed description of implementations of the present application is provided in conjunction with specific embodiments.
As shown in fig. 1, an embodiment of the present application provides an lng cold energy ice making device, which includes an lng gasification heat exchange system, a refrigerant circulation system, and an ice making system; the liquefied natural gas gasification heat exchange system comprises a gas storage tank 1, a gasification second branch and a gas utilization device 6; the gasification second branch comprises a second low-temperature valve 3, a condenser 7 and a second gasifier 5 which are connected in sequence; one end of the second low-temperature valve 3, which is far away from the condenser 7, is connected with the gas storage tank 1, and one side of the second gasifier 5, which is far away from the condenser 7, is connected with gas-using equipment 6; the refrigerant circulating system comprises a condenser 7, a refrigerant storage tank 8 connected with the condenser 7, a refrigerant pump 9 connected with the refrigerant storage tank 8, and a refrigerant circulating first branch connected with the refrigerant pump 9; the first branch of the refrigerant cycle comprises a first evaporator 13 connected to the refrigerant pump 9; the ice making system comprises a first water inlet pipe 17 and a first ice maker connected with the first water inlet pipe 17; the first ice maker is in heat conducting contact with a first evaporator 13.
In the embodiment of the present application, the ice making process of the lng cold energy ice making device is as follows: the liquefied natural gas is subjected to heat exchange with a refrigerant in the refrigerant circulating system at the condenser 7, then is heated to 0 ℃, then enters the second gasifier 5 for heating, and finally enters a downstream natural gas pipeline for use by the gas equipment 6. The refrigerant in the refrigerant circulating system is liquefied into liquid after being cooled in the condenser 7, is stored in the refrigerant storage tank 8, is input to the first evaporator 13 through the refrigerant pump 9 for evaporation, absorbs heat during evaporation of the refrigerant to enable water in the first ice maker in heat conduction contact with the first evaporator 13 to be solidified into ice blocks, and the ice blocks are separated and then transported into a factory building for cooling, so that the working environment of the factory area is improved; or put into a cooling water pool to replace a cooling water tower, thereby reducing the energy consumption.
The first ice maker may be installed inside the first evaporator 13, not shown in the drawing. To comply with safety regulations, the condenser 7 may be installed in an explosion-proof area. The refrigerant pump 9 may be a cryopump with insulation.
Further, referring to fig. 1, as another specific embodiment of the lng cold energy ice making device provided by the present application, the lng gasification heat exchange system further includes a gasification first branch connected in parallel with the gasification second branch; the gasification first branch comprises a first low-temperature valve 2 connected with the gas storage tank 1 and a first gasifier 4 connected with the first low-temperature valve 2; the first vaporizer 4 is connected to a gas-using device 6. On the basis of the second gasification branch, the first gasification branch connected in parallel with the second gasification branch is arranged, namely, the liquefied natural gas flowing out of the gas storage tank 1 is divided into two parts which respectively enter the second gasification branch and are mixed before entering the gas utilization equipment 6.
Further, referring to fig. 1, as another embodiment of the lng cold energy ice making apparatus provided by the present application, the first branch of the refrigerant cycle further includes a first refrigerant inlet adjusting valve 11 disposed between the refrigerant pump 9 and the first evaporator 13 to adjust the operation of the first branch of the refrigerant cycle.
Further, referring to fig. 1, as another embodiment of the lng cold energy ice making apparatus provided by the present application, the refrigerant cycle system further includes a refrigerant buffer tank 15 connected to the first evaporator 13, and a refrigerant outlet valve 16 disposed between the refrigerant buffer tank 15 and the condenser 7.
Further, referring to fig. 1, as another embodiment of the lng cold energy ice making apparatus provided by the present application, the refrigerant cycle system further includes a refrigerant cycle second branch connected in parallel with the refrigerant cycle first branch; the second branch of the refrigerant cycle comprises a second refrigerant inlet regulating valve 12 connected with the refrigerant pump 9, and a second evaporator 14 connected with the second refrigerant inlet regulating valve 12; the side of the second evaporator 14 remote from the second refrigerant inlet regulating valve 12 is connected to a refrigerant buffer tank 15. The refrigerant circulation second branch circuit is connected with the refrigerant circulation first branch circuit in parallel, so the refrigerant circulation first branch circuit and the refrigerant circulation second branch circuit can work independently respectively, each works for a certain time and mutually switches working states to continuously make enough ice blocks.
The first evaporator 13 and the second evaporator 14 are arranged in parallel and switched to operate, and when ice blocks of one evaporator are separated, transported and injected with water in the ice block preparation process, the other evaporator is started, so that continuous and uninterrupted cold consumption is realized, and stable operation of equipment is maintained. The liquefied natural gas gasification system and the ice making system can be independently operated while the cold energy of the liquefied natural gas is fully recycled, so that the mutual restriction of the liquefied natural gas gasification system and the ice making system is avoided, and the loss of the cold energy of the liquefied natural gas is greatly reduced.
Further, referring to fig. 1, as another embodiment of the lng cold energy ice making apparatus provided by the present application, the refrigerant cycle system further includes a refrigerant cycle bypass branch connected in parallel with the refrigerant cycle first branch; the refrigerant circulation bypass branch comprises a refrigerant bypass adjusting valve 10 connected with a refrigerant pump 9; a refrigerant bypass regulating valve 10 is connected to the side of the condenser 7 remote from the refrigerant storage tank 8. Because the heat load can be changed due to the generation of ice, the change of the heat exchange amount and the switching of the ice making mode in the ice making process, the control system is provided with a control program, and adjusts the refrigerant bypass adjusting valve 10 according to the heat load of the ice making system so as to control the amount of the passing refrigerant and realize the stability of controlling the flow of the liquefied natural gas in the condenser 7.
Further, referring to fig. 1, as another specific embodiment of the lng cold energy ice making device provided by the present application, the ice making system further includes a second water inlet pipe 18 connected in parallel with the first water inlet pipe 17, and a second ice making machine connected to the second water inlet pipe 18; the second ice maker is in heat transfer contact with second evaporator 14. The second ice maker and the first ice maker can be arranged in a non-explosion-proof area, so that manual operation is facilitated.
Further, referring to fig. 1, as another embodiment of the lng cold energy ice making apparatus provided by the present application, the condenser 7 is a coiled pipe heat exchanger or a U-shaped pipe heat exchanger.
Further, referring to fig. 1, as another specific embodiment of the liquefied natural gas cold energy ice making device provided by the present application, the refrigerant storage tank 8 is a heat-insulating pressure vessel, and an organic phase-change refrigerant is disposed in the refrigerant storage tank 8; the bottom of the refrigerant storage tank 8 is connected to a refrigerant pump 9.
Further, referring to fig. 1, as another embodiment of the lng cold energy ice making apparatus provided by the present application, the first vaporizer 4 and the second vaporizer 5 are both air temperature vaporizers.
It is to be understood that aspects of the present invention may be practiced otherwise than as specifically described.
It should be understood that the above examples are merely examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.
Claims (10)
1. The liquefied natural gas cold energy ice making device is characterized by comprising a liquefied natural gas gasification heat exchange system, a refrigerant circulating system and an ice making system; the liquefied natural gas gasification heat exchange system comprises a gas storage tank, a gasification second branch and gas utilization equipment; the gasification second branch comprises a second low-temperature valve, a condenser and a second gasifier which are sequentially connected; one end of the second low-temperature valve, which is far away from the condenser, is connected with the gas storage tank, and one side of the second gasifier, which is far away from the condenser, is connected with the gas-using equipment; the refrigerant circulating system comprises the condenser, a refrigerant storage tank connected with the condenser, a refrigerant pump connected with the refrigerant storage tank, and a refrigerant circulating first branch circuit connected with the refrigerant pump; the first branch of the refrigerant cycle comprises a first evaporator connected to the refrigerant pump; the ice making system comprises a first water inlet pipe and a first ice making machine connected with the first water inlet pipe; the first ice maker is in thermally conductive contact with the first evaporator.
2. The lng cold energy ice making apparatus of claim 1, wherein the lng vaporization heat exchange system further comprises a vaporizing first branch in parallel with the vaporizing second branch; the first gasification branch comprises a first low-temperature valve connected with the gas storage tank and a first gasifier connected with the first low-temperature valve; the first gasifier is connected with the gas-using equipment.
3. An lng cold energy ice making apparatus according to claim 1, wherein said first branch of refrigerant cycle further comprises a first refrigerant inlet regulating valve provided between said refrigerant pump and said first evaporator.
4. An apparatus as claimed in claim 1, wherein the refrigerant cycle system further comprises a refrigerant buffer tank connected to the first evaporator, and a refrigerant outlet valve provided between the refrigerant buffer tank and the condenser.
5. An apparatus as claimed in claim 4, wherein said refrigerant cycle system further comprises a second branch of refrigerant cycle in parallel with said first branch of refrigerant cycle; the refrigerant circulation second branch comprises a second refrigerant inlet regulating valve connected with the refrigerant pump and a second evaporator connected with the second refrigerant inlet regulating valve; and one side of the second evaporator, which is far away from the second refrigerant inlet regulating valve, is connected with the refrigerant buffer tank.
6. An apparatus as claimed in claim 5, wherein said refrigerant cycle system further includes a refrigerant cycle bypass branch connected in parallel with said refrigerant cycle first branch; the refrigerant circulation bypass branch comprises a refrigerant bypass adjusting valve connected with the refrigerant pump; the refrigerant bypass adjusting valve is connected with one side of the condenser, which is far away from the refrigerant storage tank.
7. An lng cold energy ice making apparatus according to claim 5, wherein said ice making system further comprises a second water inlet pipe arranged in parallel with said first water inlet pipe, and a second ice maker connected to said second water inlet pipe; the second ice maker is in thermally conductive contact with the second evaporator.
8. An apparatus as claimed in claim 1, wherein the condenser is a coiled heat exchanger or a U-tube heat exchanger.
9. An ice making apparatus using cold energy of lng according to claim 1, wherein the refrigerant storage tank is a heat-insulating pressure vessel, and an organic phase change refrigerant is provided in the refrigerant storage tank; the bottom of the refrigerant storage tank is connected with the refrigerant pump.
10. An apparatus as claimed in claim 2, wherein the first vaporizer and the second vaporizer are both air-temperature vaporizers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921740541.2U CN211345956U (en) | 2019-10-16 | 2019-10-16 | Liquefied natural gas cold energy ice making device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921740541.2U CN211345956U (en) | 2019-10-16 | 2019-10-16 | Liquefied natural gas cold energy ice making device |
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| Publication Number | Publication Date |
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| CN211345956U true CN211345956U (en) | 2020-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921740541.2U Expired - Fee Related CN211345956U (en) | 2019-10-16 | 2019-10-16 | Liquefied natural gas cold energy ice making device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112629091A (en) * | 2021-01-12 | 2021-04-09 | 乳山市创新新能源科技有限公司 | LNG cold energy recovery and ice making system |
| CN114322384A (en) * | 2021-12-31 | 2022-04-12 | 华南理工大学 | High-coupling LNG cold energy ice making process and device |
-
2019
- 2019-10-16 CN CN201921740541.2U patent/CN211345956U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112629091A (en) * | 2021-01-12 | 2021-04-09 | 乳山市创新新能源科技有限公司 | LNG cold energy recovery and ice making system |
| CN114322384A (en) * | 2021-12-31 | 2022-04-12 | 华南理工大学 | High-coupling LNG cold energy ice making process and device |
| CN114322384B (en) * | 2021-12-31 | 2022-10-21 | 华南理工大学 | High-coupling LNG cold energy ice making process and device |
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