CN102705705A

CN102705705A - Phase-change-free liquefied natural gas (LNG) cold energy utilization device for refrigerator

Info

Publication number: CN102705705A
Application number: CN2012101764973A
Authority: CN
Inventors: 王忙忙
Original assignee: Tianjin Huamai Gas Equipment Co Ltd
Current assignee: Tianjin Huamai Gas Equipment Co Ltd
Priority date: 2012-05-31
Filing date: 2012-05-31
Publication date: 2012-10-03

Abstract

The invention relates to a phase-change-free liquefied natural gas (LNG) cold energy utilization device for a refrigerator. The device comprises an LNG system, a cold energy utilization system and an electric control disc, wherein the LNG system consists of an LNG storage tank, an emergency cut-off valve a, an air temperature vaporizer a, a pressure regulator a, a stop valve a, an LNG-ammonia tube heat exchanger and an air temperature vaporizer b and is provided with a pressure sensor; the cold energy utilization system consists of a liquid ammonia storage tank, an ammonia pump, an emergency cut-off valve b, a turbine flowmeter, a pressure regulator b, the refrigerator, a stop valve b and the LNG-ammonia tube heat exchanger; the refrigerator is provided with a temperature sensor; and the LNG system and the cold energy utilization system exchange heat through the LNG-NH3 tube heat exchanger, LNG flows in a tube, and ammonia flows outside the tube. The device has the advantages that the device is clean, environment-friendly and energy-saving, accords with the national policy of developing China into a conservation-minded society, and has obvious economic and technological effects and profound social benefits, and the using cost of the LNG can be greatly reduced.

Description

A kind of no phase transformation LNG cold energy use device that is used for freezer

(1) technical field

The present invention relates to LNG Liquefied natural gas (LNG) stand the district corollary equipment, particularly a kind of no phase transformation LNG cold energy use device that is used for freezer.

(2) background technique

Producing 1 ton of LNG Liquefied natural gas (LNG) needs to consume the electric power of 850kWh, and its bright value has only about 120kWh, and in the process of liquefaction, irreversible loss reaches 730kWh, and this is that institute is unescapable in the process of freezing.If pass to the cold energy user to potential temperatures such as these colds, and consider heat transfer temperature difference and process loss, then generally can practice thrift the electric power of 500-700kWh.Under the extremely severe energy situation of current China, we have a responsibility for making full use of these valuable cold energy.Fully drawing on the basis of external experience and lesson, further autonomous innovation, exploitation LNG cold energy complex optimum utilizes technology.

(3) summary of the invention

The objective of the invention is provides a kind of no phase transformation LNG cold energy use device that is used for freezer to above-mentioned existing problems, and this installs energy saving, clean environment firendly, helps reducing the user cost of LNG.

Technological scheme of the present invention:

A kind of no phase transformation LNG cold energy use device that is used for freezer comprises LNG system, cold energy use system and control system, and the LNG system is by LNG storage tank, Emergeny Cutoff Valves a, empty temperature vaporizer a, pressure governor a, stop valve a, LNG-NH ₃Tubular heat exchanger is formed with empty temperature vaporizer b and is connected through pipeline, wherein the series pipe of Emergeny Cutoff Valves a and empty temperature vaporizer a and stop valve a, LNG-NH ₃The series pipe parallel connection of tubular heat exchanger and empty temperature vaporizer b is at LNG-NH ₃The connecting pipeline of tubular heat exchanger and empty temperature vaporizer b is provided with pressure transducer; The cold energy use system is by liquid ammonia storage tank, ammonia pump, Emergeny Cutoff Valves b, turbine flowmeter, pressure governor b, freezer, stop valve b and LNG-NH ₃Tubular heat exchanger is formed and is connected in series through pipeline, and freezer is provided with temperature transducer; LNG system and cold energy use system pass through LNG-NH ₃Tubular heat exchanger carries out heat exchange, and wherein LNG walks in the tubulation, and ammonia is walked outside the tubulation; Control system is an electric control panel, and Emergeny Cutoff Valves a, Emergeny Cutoff Valves b, pressure transducer and temperature transducer are connected with electric control panel respectively through lead.

Working procedure of the present invention:

LNG is divided into two-way, and one road LNG gets into empty temperature vaporizer a gasification and is the rock gas of normal temperature, after pressure regulator valve a pressure regulation, gets into urban pipe network, accomplishes the gasification of LNG; The ammonia that another road LNG will go out freezer passes through LNG-NH ₃The tubular heat exchanger condensation is after empty temperature vaporizer b gasification is warming up to normal temperature, again with former LNG gasification system in rock gas mix, finally send into urban pipe network.Simultaneously, through LNG-NH ₃The condensed liquefied ammonia of tubular heat exchanger is forced into through ammonia pump that order flow to pressure governor b through turbine flowmeter behind the required pressure, is depressurized to working pressure, send into freezer refrigerating at last after, return LNG-NH again ₃Tubular heat exchanger is accomplished the circulation of low pressure ammonia refrigeration.Because the LNG temperature is low more, the cold energy of release is high more, so cold energy is passed in the refrigerant process at LNG, this device keeps LNG not undergo phase transition.

Applicable scope of the present invention is: the refrigeration system of big-and-middle-sized freezer.

Advantage of the present invention: this device has the two-fold advantage of clean environment firendly and energy saving, can reduce the user cost of LNG greatly, meets the state basic policy of China to conservation-minded society's development, thereby has remarkable economical technique effect and far-reaching social benefit.

(4) description of drawings

Accompanying drawing is that this LNG cold energy use is in freezer device schematic flow sheet.

Among the figure: 1.LNG storage tank 2. Emergeny Cutoff Valves a 3. empty temperature vaporizer a

4. pressure governor a 5. stop valve a 6.LNG-NH ₃Tubular heat exchanger

7. empty temperature vaporizer b 8. liquid ammonia storage tanks 9. ammonia pumps 10. Emergeny Cutoff Valves b 11. turbine flowmeters 12. pressure governor b 13. freezers 14. stop valve b

15. pressure transducer 16. temperature transducers 17. electric control panels

(5) embodiment

Embodiment:

A kind of no phase transformation LNG cold energy use device that is used for freezer comprises LNG system, cold energy use system and control system, and the LNG system is by LNG storage tank 1, Emergeny Cutoff Valves a2, empty temperature vaporizer a3, pressure governor a4, stop valve a 5, LNG-NH ₃ Tubular heat exchanger 6 is formed with empty temperature vaporizer b and is connected through pipeline, wherein the series pipe of Emergeny Cutoff Valves a2 and empty temperature vaporizer a3 and stop valve a 5LNG-NH ₃The series pipe parallel connection of tubular heat exchanger 6 and empty temperature vaporizer b7 is at LNG-NH ₃The connecting pipeline of tubular heat exchanger and empty temperature vaporizer b is provided with pressure transducer; The cold energy use system is by liquid ammonia storage tank 8, ammonia pump 9, Emergeny Cutoff Valves b10, turbine flowmeter 11, pressure governor b12, freezer 13, stop valve b14 and LNG-NH ₃ Tubular heat exchanger 6 is formed and is connected in series through pipeline, and freezer is provided with temperature transducer 16; LNG system and cold energy use system pass through LNG-NH ₃ Tubular heat exchanger 6 carries out heat exchange, and wherein LNG walks in the tubulation, and ammonia is walked outside the tubulation; Control system is an electric control panel 17, and Emergeny Cutoff Valves a2, Emergeny Cutoff Valves b10, pressure transducer 15 and temperature transducer 16 are connected with electric control panel 17 respectively through lead.

Among this embodiment, air-heating type gasifier adopts domestic Suzhou new master's HAQ-500; LNG-NH ₃Tubular heat exchanger adopts the stainless steel tubular heat exchanger corrosion-resistant, that heat transfer efficiency is high, LNG-NH ₃Tubular heat exchanger, heat transfer tubulation specification is φ 38 * 3, material 304; Pressure governor adopts U.S. fisher brand 627 series voltage regulation devices; Turbine flowmeter adopts sky, Zhejiang letter product, and model is TBQZ-100C; Pressure transducer adopts Japanese Yokogawa product, and model is EJA530A-ECS4N-02DN/NF1; Temperature transducer adopts the Rosemount product, and model is 3144PD2A1E1Q4 L=45; The HPT-III product that electric control panel adopts Tianjin China to step.

This device is applicable to the refrigeration system of big-and-middle-sized freezer.

Claims

1. no phase transformation LNG cold energy use device that is used for freezer, it is characterized in that: comprise LNG system, cold energy use system and control system, the LNG system is by LNG storage tank, Emergeny Cutoff Valves a, empty temperature vaporizer a, pressure governor a, stop valve a, LNG-NH ₃Tubular heat exchanger is formed with empty temperature vaporizer b and is connected through pipeline, wherein the series pipe of Emergeny Cutoff Valves a and empty temperature vaporizer a and stop valve a, LNG-NH ₃The series pipe parallel connection of tubular heat exchanger and empty temperature vaporizer b is at LNG-NH ₃The connecting pipeline of tubular heat exchanger and empty temperature vaporizer b is provided with pressure transducer; The cold energy use system is by liquid ammonia storage tank, ammonia pump, Emergeny Cutoff Valves b, turbine flowmeter, pressure governor b, freezer, stop valve b and LNG-NH ₃Tubular heat exchanger is formed and is connected in series through pipeline, and freezer is provided with temperature transducer; LNG system and cold energy use system pass through LNG-NH ₃Tubular heat exchanger carries out heat exchange, and wherein LNG walks in the tubulation, and ammonia is walked outside the tubulation; Control system is an electric control panel, and Emergeny Cutoff Valves a, Emergeny Cutoff Valves b, pressure transducer and temperature transducer are connected with electric control panel respectively through lead.