CN103629840B - A kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding - Google Patents

A kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding Download PDF

Info

Publication number
CN103629840B
CN103629840B CN201310513654.XA CN201310513654A CN103629840B CN 103629840 B CN103629840 B CN 103629840B CN 201310513654 A CN201310513654 A CN 201310513654A CN 103629840 B CN103629840 B CN 103629840B
Authority
CN
China
Prior art keywords
pressure
natural gas
refrigeration
working medium
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201310513654.XA
Other languages
Chinese (zh)
Other versions
CN103629840A (en
Inventor
熊永强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jinan University
Original Assignee
Jinan University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jinan University filed Critical Jinan University
Priority to CN201310513654.XA priority Critical patent/CN103629840B/en
Publication of CN103629840A publication Critical patent/CN103629840A/en
Application granted granted Critical
Publication of CN103629840B publication Critical patent/CN103629840B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Disintegrating Or Milling (AREA)

Abstract

Relate to the high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding, in natural gas pressure regulating station, by decompressor, the pressure energy of high-pressure natural gas is converted to mechanical power and cold energy; Refrigeration working medium is utilized to reclaim mechanical power and cold energy, mechanical power is used for compression refrigeration working medium, by optimal design heat-exchange network, the cold energy utilizing high-pressure natural gas expansion to produce carrys out the high-pressure refrigeration working medium after cooled compressed, improves the mechanical power that the intake air temperature entering the high-pressure natural gas of decompressor increases high-pressure natural gas expansion generation; Through hot insulated line, the high-pressure refrigeration working medium of cooling is transported to junked tire low-temperature grinding plant area, high-pressure refrigeration working medium produces the cryogenic cold energy of less than-100 DEG C by working medium decompressor, the mechanical power that the expansion of high-pressure refrigeration working medium produces is for having utilized the preliminary supercharging of the refrigeration working medium after cold energy, send natural gas pressure regulating station again back to, form kind of refrigeration cycle.Have effective use of energy sources, effective pre-anti-icing stifled advantage, belongs to pressure energy of natural gas and utilizes field.

Description

A kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding
Technical field
The present invention relates to pressure energy of natural gas and utilize field, be specifically related to a kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding.
Background technology
Along with the fast development of auto industry, China's tire annual production, more than 1.5 hundred million, occupies third place in the world after the U.S., Japan, produces junked tire every year more than 100,000,000, and with annual double-digit speed increment.The accumulation land occupation of a large amount of damaged tire, not only causes the waste of resource, and due to junked tire be heat cured polymeric material, very difficultly degrade, " black pollution " that increasingly sharpen makes the matter worse to the ecological environment that China is originally fragile.On the other hand, China's rubber sources is very deficient, and rubber raw materials mainly meets the needs of the national economic development by import.Therefore, recycling of junked tire, is not only conducive to " black pollution " that prevent junked tire from causing, and contributes to utilizing regenerated resources, break away from rubber scarcity of resources.
The recycling of junked tire mainly contains heat energy utilization, reclaimed rubber produces and rubber powder prepares this three kinds of methods, and for avoiding producing secondary pollution problem, current developed country generally takes that rubber powder is made in waste old pulverizing and recycled.Rubber powder is direct or modified is widely used in the fields such as rubber plastic product, chemical building material, highway communication, not only can Substitute For Partial rubber, and can improve some performance of product.As highway, runway adopt the pitch adding rubber powder modified, 1 ~ 3 times can be increased the service life than prevailing roadway, reduce noise 50 ~ 70%, improve heat-resisting, the cold resistance on road surface, strengthen skid resistance, improve safety coefficient, and can construction investment be saved.
Junked tire is pulverized and is divided into ambient ground and low-temperature grinding two kinds.Normal temperature crushing up equipment is simple, treating capacity is large, cost is lower, but the rubber powder size produced is thicker, general below 100 orders, be mainly used in the goods that performance requirement is not high, as produced reclaimed rubber, paving asphalt modification blended stock, plastic cement race track, lawn, floor tile, low-grade sole material etc., if but require, in higher material and goods (as thermoplastic elastomer (TPE), special type protection coating, radial etc.), the fine glue powder of more than 100 orders must be adopted for serviceability.The production of fine glue powder can only adopt cryogenic freezing to pulverize, and technical process needs a large amount of colds.
At present, the cryogenic freezing breaking method of junked tire comprises liquid nitrogen frozen comminuting method and air turbine expander refrigeration comminuting method.Liquid nitrogen frozen comminuting method adopts the liquid nitrogen spraying of-196.0 DEG C to carry out frozen rubber, and then ground by rubber at low temperatures; In Chinese invention patent ZL01107899.5, the LY type liquid nitrogen freezing of Luye Rubber Co., Ltd., Qingdao's exploitation takes thick rubber powder and fine glue powder through the mode of the cold and hot exchange of level Four to recycle the cold energy of fine glue powder, produce 1 ton of fine glue powder and only need consume 0.32 ton of liquid nitrogen, significantly reduce than the liquid nitrogen consumption of external similar technique.But because liquid nitrogen price is more expensive, the production cost of rubber powder is still higher, in order to reduce refrigeration cost, China develops air turbine expander refrigeration comminuting method.
Chinese utility model patent ZL86207494 proposes a kind of air turbine continuous cooling device, and by air compressing, drying, then expand the Cryogenic air obtaining-100 DEG C in turbine, and the cryogenic freezing that may be used for junked tire is pulverized.
Chinese utility model patent ZL01273774.7 also provides a kind of air turbine refrigerator, has that cost is low, efficiency is high, a feature such as cryogenic temperature good stability and storing convenience, environmentally safe, can be used for rubber low-temperature grinding.
Chinese invention patent ZL99100661.5 proposes a kind of method that junked tire prepares rubber powder, this patent takes air compressing, drying, then freon refrigerator multi-sectional refrigerating is utilized, then by turbine adiabatic expansion, obtain the cold air of-110 DEG C ~-130 DEG C, then utilize this cold air that 8 ~ 40 object micelles are refrigerated to below vitrification point, then pulverize as fine glue powder.Air turbine expander refrigeration comminuting method is lower than the energy consumption of liquid nitrogen frozen comminuting method, but compressed air still needs to consume a large amount of electric energy.
Because the cryogenic temperature of producing the less superfinishing fine powder of particle diameter requires lower, the cold energy of needs is more, and production cost is higher.Because production cost is higher, in industrially developed country, there is subsidy to the recovery of waste old and process.And China's fine and ultra tiny rubber powder of production mainly adopts air swell refrigeration comminuting method and liquid nitrogen cryogenics comminuting method, owing to subsidizing junked tire purchase and process nothing, the fine glue powder of production small particle diameter because of energy consumption for cooling high, cause cost to remain high, seriously constrain the exploitation of the application technology of the above fine glue powder downstream product of 100 order.Therefore, reduce the refrigeration cost in junked tire cryogenic crushing process, for reduction fine glue powder production cost, the development that promotion junked tire recycles industry is significant.
Along with developing rapidly of Gas Industry, China accelerates the construction of gas distributing system, and expect the year two thousand twenty China and will build up the Gao Long-distance Transmission Pipeline of 50,000 kms, Natural Gas Consumption Using will reach 4000 billion cubic meters.In order to reduce the caliber of natural gas transmission pipeline, save tubing and operating expenses, so the long-distance transport pipes of natural gas all adopt high-pressure delivery on our times.The large-scale natural gas long-distance transport pipes of China, distribution pressure as " line of transferring natural gas from the west to the east ", " two wires, capital, Shan ", " the second west to east gas pipeline project " etc. all reaches 10.0MPa, and the several imported L NG projects built up, the pressure of its High Pressure Gas Transmitting Pipeline is also all at more than 7.0MPa.The downstream user of current natural gas mainly contains plant gas, gas, industry and commerce user etc., the natural gas wherein entering gas turbine power generation in plant gas requires that pressure is at about 2.0MPa, and the middle pressure pressure of gas line network of gas is general all at below 0.5MPa.Therefore, the natural gas in high pressure pipe network needs to carry out step-down at point defeated station, urban gate station, a natural gas pressure regulating station etc. usually could supply user's use.Natural gas has a large amount of pressure energies to utilize at pressure reduction, and the pressure energy that 100 billion cubic meter high-pressure natural gas are down to 0.5MPa recoverable from 8.0MPa can reach 8.2 hundred million kilowatt hours.At present, the natural gas line pressure energy utilization rate of China is extremely low, a large amount of pressure energies direct reducing pressure by regulating flow and have lost in door station, point defeated station and voltage regulating station.Therefore, make full use of the pressure energy of gas distributing system, can energy loss be reduced, improve energy ground utilization ratio, increase the economy of pipe network operation.
High-pressure natural gas is in the process of expansion step-down, and temperature can reduce, and pressure energy can be converted into cold energy.The existing multiple patented technology utilizing high-pressure natural gas pressure energy refrigeration.
Chinese invention patent (application) 200810026979.4 proposes and a kind ofly utilizes high-pressure natural gas directly by the technological process of unpowered refrigeration machine decompressional expansion refrigeration, can obtain the cold energy between-40 DEG C ~-100 DEG C.Owing to adopting direct expansion in this patent, do not utilize the mechanical energy that expansion process produces, only make use of the cold energy expanding and produce, therefore the utilization ratio of pressure energy is lower, less than 50%.And the cold energy temperature produced is higher, be not easy the low temperature obtaining less than-100 DEG C, the low-temperature grinding not being suitable for junked tire produces fine glue powder.And in pipe natural gas expansion temperature-fall period, the moisture when the temperature is too low in natural gas can separate out icing occluding device and pipeline.According to regulation in national standard " code for design of gas transmission pipeline engineering " (GB50251-2003): the water dew point entering the gas of gas pipeline should be lower than environment temperature minimum under transport condition 5 DEG C.At present, the aqueous dew point temperature of China's major part pipeline gas is in summer all more than 0 DEG C, and winter is between-5 DEG C ~-15 DEG C.Therefore, direct decompressional expansion can cause more serious ice to block up phenomenon to less than-40 DEG C.
Chinese invention patent 200510037532.3 and Chinese invention patent (application) 201210128345.6 propose the technological process utilizing high-pressure natural gas pressure energy swell refrigeration liquefied natural gas.These two patents, by pre-cold-peace swell refrigeration, can produce the cryogenic natural gas of less than-100 DEG C.But it is too low to lower the temperature, the pipeline gas equally easily icing ice that produces blocks up phenomenon, and impact is produced, and need the dehydration of capital intensive, depickling facility to reduce water and carbon dioxide content, operating cost is also higher.
Chinese invention patent (application) 201110412697.X proposes a kind of method utilizing the generating of pipe network pressure energy of natural gas and ice making.Utilize high-pressure natural gas direct expansion to generate electricity on the one hand in the method, the low temperature produced that expanded by natural gas is on the other hand used for ice making.The method not only make use of the mechanical energy that high-pressure natural gas expansion produces, and can utilize the cold energy of generation.But the method expands, the cold energy temperature produced is higher, generally at about-20 ~-30 DEG C, cannot be used for the low-temperature grinding of junked tire.
From above-mentioned existing report, junked tire low-temperature grinding is made the cold energy that fine glue powder needs to consume less than-100 DEG C temperature, the energy consumption for cooling of reduction rubber powder production process and cost are the keys of the extensive recycling of junked tire.High-pressure natural gas expands not only can produce a large amount of mechanical energy, and can cryogenic cold energy be produced, but because most of pipeline gas aqueous dew point temperature is higher, cause e-quipment and pipe to produce ice to prevent cooling and block up, the temperature after natural gas expansion step-down is unsuitable too low.Therefore, in junked tire cryogenic crushing process, how to utilize the pressure energy of gas distributing system to produce the cold energy of less than-100 DEG C fully, the low-temperature grinding cost for the utilization ratio and reduction junked tire that improve pressure energy of natural gas has very important significance.
Summary of the invention
In order to overcome, the efficiency existed in above-mentioned existing high-pressure natural gas pressure energy Application way is lower, ice blocks up phenomenon, cold energy temperature is higher in pipeline gas cooling easy generation, and the problem of producing fine glue powder demand cannot be met, the object of the present invention is to provide a kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding, under preventing pipeline gas from producing the stifled prerequisite of ice, make full use of the pressure energy refrigeration of high-pressure natural gas, for junked tire low-temperature crushing device provides the cold energy of less than-100 DEG C temperature, for the production of fine glue powder.
Object of the present invention is achieved through the following technical solutions:
For a high-pressure natural gas pressure energy refrigeration method for waste old low-temperature grinding, comprise following operating procedure: be first by decompressor, the pressure energy of high-pressure natural gas is converted to mechanical power and cold energy in natural gas pressure regulating station; Then mechanical power and cold energy that refrigeration working medium produces for communication medium recycling high-pressure natural gas expands is utilized, on the one hand mechanical power being used for compression refrigeration working medium becomes high-pressure refrigeration working medium, on the other hand by optimal design heat-exchange network, the cold energy utilizing high-pressure natural gas expansion to produce carrys out the high-pressure refrigeration working medium after cooled compressed, and the intake air temperature of the high-pressure natural gas entering decompressor can be improved, increase the mechanical power that high-pressure natural gas expansion produces; Then hot insulated line is utilized, the high-pressure refrigeration working medium of cooling is transported to the junked tire low-temperature grinding plant area outside natural gas pressure regulating station, then high-pressure refrigeration working medium is by the cryogenic cold energy of less than-100 DEG C needed for working medium expander generation junked tire low-temperature grinding process, the mechanical power that high-pressure refrigeration working medium expansion simultaneously produces is for having utilized the preliminary supercharging of the refrigeration working medium after cold energy, and then by hot insulated line, the refrigeration working medium after preliminary supercharging is transmitted back to natural gas pressure regulating station, form kind of refrigeration cycle.
For a high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding, comprise the following steps:
A. high-pressure natural gas flow control:
Be transported to the high-pressure natural gas at natural gas pressure regulating station by upstream high pipe network, its pressure is in 1.6MPa(absolute pressure, and the pressure hereafter occurred is absolute pressure) more than; High-pressure natural gas is divided into two strands after entering natural gas pressure regulating station: one is pressure regulation natural gas flow, and it first enters in conventional pressure regulator and is depressurized to 0.4 ~ 0.5MPa after flow valve A, then enters fecder system network; Another stock is refrigeration natural gas flow, and it enters pressure energy and utilizes device after flow valve B, for junked tire low-temperature crushing device provides required cold energy; When fluctuation occurs downstream natural gas consumption or junked tire low-temperature crushing device chilling requirement changes, by adjust flux valve A and flow valve B, the cold energy demand using gas demand and junked tire low-temperature crushing device of downstream user can be met simultaneously;
B. high-pressure natural gas pressure energy reclaims:
In step a through the refrigeration natural gas flow of flow valve B first by heat exchanger A with to flow out from low pressure working fluid compressor and to be transported to the low voltage refrigeration working medium heat exchange at natural gas pressure regulating station by hot insulated line, again by heat exchanger B and the middle pressure refrigeration working medium heat exchange of therefrom pressing Alternative Refrigerant Compressors to flow out, after obtaining heat, temperature is increased to 50 ~ 100 DEG C; Then refrigeration natural gas flow enters in natural gas high pressure decompressor to expand and carries out step-down, the mechanical power that natural gas high pressure decompressor exports is used for pressing Alternative Refrigerant Compressors in driving, the natural gas temperature simultaneously flowed out from natural gas high pressure decompressor reduces, make its temperature higher than the water dew point (summer, winter was higher than-5 DEG C higher than 0 DEG C) of natural gas by regulating the outlet pressure of natural gas high pressure decompressor; When the transmission & distribution pressure of the gas pressure flowed out from natural gas high pressure decompressor still higher than fecder system network, this refrigeration natural gas flow is again through heat exchanger C and the low voltage refrigeration working medium heat exchange of flowing out from heat exchanger A, and through heat exchanger D and the high-pressure refrigeration working medium heat exchange of flowing out from high-pressure working medium compressor, after absorbing heat, the temperature of refrigeration natural gas flow is increased to 20 ~ 60 DEG C; Then the natural gas flow that freezes enters in natural gas medium-pressure decompressor to expand and is depressurized to 0.4 ~ 0.6MPa, the mechanical power that natural gas medium-pressure decompressor exports is for driving high-pressure working medium compressor, the refrigeration natural gas flow temperature simultaneously flowed out from natural gas medium-pressure decompressor reduces, but its temperature is still higher than the water dew point of natural gas; After this, the high-pressure refrigeration working medium heat exchange that refrigeration natural gas flow flows out successively in heat exchanger E and from heat exchanger D, in heat exchanger F Yu from heat exchanger B flows out, press refrigeration working medium heat exchange, the temperature of refrigeration natural gas flow is increased to after more than 10 DEG C and enters fecder system network;
C. for the working medium kind of refrigeration cycle of junked tire low-temperature grinding:
Cryogenic refrigeration working medium discharges cold energy for the precooling of junked tire, freezing and low-temperature grinding in junked tire low-temperature crushing device, and temperature is increased to normal temperature, and pressure is close to normal pressure, this normal pressure refrigeration working medium is through low pressure working fluid compressor boost to 0.2 ~ 0.4MPa, and temperature is increased to 90 ~ 150 DEG C, becomes low voltage refrigeration working medium, low voltage refrigeration working medium is transported in contiguous natural gas pressure regulating station by hot insulated line from junked tire low-temperature grinding plant area, the refrigeration natural gas flow heat exchange that low voltage refrigeration working medium elder generation flows out in heat exchanger A and from flow valve B, temperature is reduced to higher than the refrigeration natural gas flow flowed out from flow valve B 10 ~ 25 DEG C, then through heat exchanger C and the refrigeration natural gas flow heat exchange of flowing out from natural gas high pressure decompressor, low voltage refrigeration Temperature of Working is reduced to 10 ~ 30 DEG C further, and then press Alternative Refrigerant Compressors supercharging to become middle pressure refrigeration working medium in warp, its pressure and temperature is determined by the output work size of natural gas high pressure decompressor, therefrom press the refrigeration natural gas flow heat exchange that Alternative Refrigerant Compressors middle pressure refrigeration working medium out flows out in heat exchanger B and from heat exchanger A, temperature is reduced to 30 ~ 60 DEG C, then in heat exchanger F Yu in flowing out from heat exchanger E, press natural gas flow heat exchange, temperature is reduced to 10 ~ 40 DEG C further, middle pressure refrigeration working medium after cooling enters high-pressure working medium compressor boost to 2.5 ~ 3.5MPa, becomes high-pressure refrigeration working medium, and the temperature and pressure of high-pressure refrigeration working medium is determined by the output work size of natural gas medium-pressure decompressor, high-pressure refrigeration working medium again through heat exchanger D and the refrigeration natural gas flow heat exchange of flowing out from heat exchanger C, and through heat exchanger E with from natural gas medium-pressure decompressor flows out, press natural gas flow to carry out heat exchange, the temperature of high-pressure refrigeration working medium is reduced to 10 ~ 40 DEG C, the high-pressure refrigeration working medium of cooling is transported to junked tire low-temperature grinding plant area by hot insulated line, then through working medium expander to 0.15 ~ 0.20MPa, temperature is reduced to less than-100 DEG C, this cryogenic refrigeration working medium sends into junked tire low-temperature crushing device, for precooling, the freezing and low-temperature grinding of junked tire, the mechanical power of working medium expander output simultaneously, for driving low pressure working fluid compressor, forms working medium kind of refrigeration cycle.
The high-pressure natural gas pressure entering natural gas pressure regulating station is in the scope of 1.6 ~ 10.0MPa; The decompressor quantity used is one or two; When the high-pressure natural gas pressure entering natural gas pressure regulating station is at 2.0 ~ 10.0MPa, two decompressors need be used, comprise natural gas high pressure decompressor and natural gas medium-pressure decompressor, high-pressure natural gas is successively through two-stage step-down, and Pressure Drop is low to moderate the distribution pressure of fecder system network; And the outlet temperature of natural gas high pressure decompressor and natural gas medium-pressure decompressor is higher than the water dew point of natural gas; When the high-pressure natural gas pressure entering natural gas pressure regulating station is at 1.6 ~ 2.0MPa, only need use a decompressor, this decompressor is natural gas high pressure decompressor, and high-pressure natural gas is through one-level step-down, and Pressure Drop is low to moderate the distribution pressure of fecder system network; And the outlet temperature by regulating the flow of the flow and refrigeration working medium that flow through the natural gas of decompressor to control natural gas high pressure decompressor, make it the water dew point higher than natural gas.
Decompressor and working medium decompressor are turbo-expander or screw expander.
Refrigeration working medium is nitrogen, argon gas or air; When refrigeration working medium is air, air and high-pressure natural gas carry out indirect heat exchange by water as heat exchange medium, and water first absorbs heat from the refrigeration working medium of high temperature, and then for heating high-pressure natural gas.
Refrigeration working medium is through low pressure working fluid compressor, middle pressure Alternative Refrigerant Compressors and the supercharging of high-pressure working medium compressor three stage compression; The mechanical power that low pressure working fluid compressor is produced by working medium decompressor drives; When use two decompressors, the mechanical power that middle pressure Alternative Refrigerant Compressors is produced by natural gas high pressure decompressor drives, and the mechanical power that high-pressure working medium compressor is produced by natural gas medium-pressure decompressor drives; When a use decompressor, the mechanical power that middle pressure Alternative Refrigerant Compressors and high-pressure working medium compressor produce by natural gas high pressure decompressor drives.
Refrigeration working medium compression supercharging produce heat energy all by heat exchanger for being heated by the natural gas of decompressor, and high-pressure natural gas expand produce cold energy all by heat exchanger be used for refrigeration working medium compression after cooling.
High-pressure natural gas is divided into two strands, and one enters fecder system network again for user after controlling to enter conventional pressure regulator by flow valve A, and one is controlled to enter decompressor by flow valve B.
The cold energy temperature that refrigeration working medium produces in junked tire low-temperature grinding plant area, the flow that on the one hand can control natural gas by the aperture of adjust flux valve B regulates, and can regulate on the other hand by regulating the internal circulating load of refrigeration working medium; The flow increasing natural gas and the flow reducing refrigeration working medium are to reduce cold energy temperature, and the flow reducing natural gas and the flow increasing refrigeration working medium are to raise cold energy temperature.
The swell refrigeration of high-pressure natural gas pressure energy and removal process are arranged on region, natural gas pressure regulating station, the preliminary pressurization of the swell refrigeration of refrigeration working medium, the cold energy use of junked tire low-temperature crushing device and the refrigeration working medium after having utilized cold energy is arranged on the junked tire low-temperature grinding plant area outside natural gas pressure regulating station, these two regions transport connection by refrigeration working medium, realize the transmission of energy.
The present invention has following advantage and effect relative to prior art:
(1) the high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding that the present invention adopts is the principle mutually changed based on energy, utilize pressure energy can produce cryogenic cold energy and mechanical power by expander, and mechanical power is greater than the characteristic of cold energy, overcome because after high-pressure natural gas expansion, temperature directly must cannot produce the shortcoming of the cryogenic cold energy of less than-100 DEG C needed for junked tire low-temperature grinding higher than its water dew point simultaneously, propose a kind of refrigeration working medium that utilizes and reclaim the mechanical power of high-pressure natural gas expansion generation and the refrigerating method of cold energy simultaneously, all can not only reclaim mechanical power and the cold energy of high-pressure natural gas expansion generation, and the cryogenic cold energy that can produce less than-100 DEG C is for the low-temperature grinding of junked tire, low-temperature grinding for junked tire provides cheap low-temperature receiver, promote recycling of waste rubber resources.
(2) the present invention is by the optimal design of heat-exchange network, the cold energy that the refrigeration natural gas flow expansion making refrigeration working medium compress heat energy and the high pressure produced produces obtains cascade utilization, on the one hand by reclaiming the heat energy of refrigeration working medium compression generation for improving the intake air temperature entering natural gas high pressure decompressor and natural gas medium-pressure decompressor, increase the mechanical power that the expansion of refrigeration natural gas flow produces, utilize the cold energy cooling refrigeration working medium that the expansion of refrigeration natural gas flow produces on the other hand, the investment of cooling infrastructure required after can saving refrigeration working medium compression and operating cost, reduce the operating cost of refrigeration working medium circularly cooling process.
(3) the present invention is tie by refrigeration working medium, the swell refrigeration of high-pressure natural gas pressure energy and removal process are arranged on region, natural gas pressure regulating station, and the cold energy use link of the swell refrigeration of refrigeration working medium and junked tire low-temperature crushing device is arranged on the junked tire low-temperature grinding plant area outside natural gas pressure regulating station, avoid two links be located at the same area and cause the mutual interference in fire-fighting, safety and land used etc., be conducive to safety in production and management.And refrigeration working medium is all carried more than normal temperature, the cold energy loss avoiding direct transporting low temperature working medium to produce.
(4) the present invention is by recycling the cryogenic cold energy that the pressure energy of high-pressure natural gas pipe network is less than-100 DEG C that junked tire low-temperature crushing device provides, and do not need extraneous other energy of consumption, energy consumption for cooling is very low.Simultaneously, by the optimal design of system, the refrigerating method of high-pressure natural gas pressure energy is utilized to have stronger operation flexible, when the high-pressure natural gas flowed fluctuation at natural gas pressure regulating station and the production load fluctuation of junked tire low-temperature crushing device, all can normal operating.Whole process provides thermal source and low-temperature receiver without the need to the external world, and can ensure that in high-pressure natural gas expansion pressure reduction, temperature is all the time higher than water dew point, avoids producing ice and blocks up phenomenon.
(5) the present invention adopts one or two decompressor to carry out step-down, applied widely.When employing two decompressor two-stage step-downs, avoid directly once being depressured to middle pressure gas distributing system distribution pressure from high pressure, cause making because expansion ratio is excessive natural gas temperature after expanding lower than its aqueous dew point temperature, produce the situation of freeze occluding device and pipeline; When an employing decompressor one-level step-down, directly at the distribution pressure utilizing the direct expansion of natural gas high pressure decompressor to middle pressure gas distributing system, the structure that pressure energy utilizes device can be simplified.
(6) when adopt inexhaustible, with it air without cease as refrigeration working medium time, security incident is there is because equipment fault makes air mix with natural gas in heat transfer process, so air and refrigeration natural gas flow carry out indirect heat exchange by water as heat exchange medium, effectively ensure handling safety.
Accompanying drawing explanation
Fig. 1 is the operational flowchart of the inventive method embodiment one
Fig. 2 is the operational flowchart of the inventive method embodiment two;
Fig. 3 is the operational flowchart of the inventive method embodiment three;
Fig. 4 is the operational flowchart of the inventive method embodiment four;
Wherein: 1-flow valve A; The conventional pressure regulator of 2-; 3-flow valve B; 4,5,7,8,10,11-heat exchanger A, B, C, D, E, F; 6-natural gas high pressure decompressor; 9-natural gas medium-pressure decompressor; Alternative Refrigerant Compressors is pressed in 12-; 13-high-pressure working medium compressor; 14,17-hot insulated line; 15-high-pressure working medium decompressor; 16-low pressure working fluid compressor; 18,19,20,21-water/air heat exchanger A, B, C, D; 22 is junked tire low-temperature crushing device.
Logistics is illustrated as follows:
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto, and for the technological parameter do not indicated especially, can refer to routine techniques and carry out.
Embodiment one
For a high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding, as shown in Figure 1, adopt two decompressors to realize secondary step-down to high-pressure natural gas, refrigeration working medium selects nitrogen in its technological process.
The high-pressure natural gas pressure being transported to city gas voltage regulating station from natural gas main pipeline network (high pressure pipe network) is 4.0MPa(absolute pressure), temperature is 15.0 DEG C, its volume consists of: methane 94.844%, ethane 2.353%, propane 0.309%, butane 0.079%, pentane 0.042%, hexane 0.032%, nitrogen 1.656%, carbon dioxide 0.655%, water 0.03%; The water dew point of this pipeline gas under 4.0MPa is 5.0 DEG C, and water dew point during 0.5MPa is-15.0 DEG C.In natural gas pressure regulating station, the high-pressure natural gas of 4.0MPa enters in city after needing to be depressurized to 0.5MPa and presses gas distributing system (fecder system network), average treatment amount be 5.0 ten thousand standard cubic meters/time, the minimum treating capacity at night be 2.5 ten thousand standard cubic meters/time, now utilize wherein 2.0 ten thousand standard cubic meters/time the pressure energy of high-pressure natural gas pressure regulation release for the production of the cryogenic cold energy of less than-100 DEG C, for the junked tire low-temperature crushing device outside natural gas pressure regulating station provides low-temperature receiver.The refrigeration working medium of junked tire low-temperature crushing device selects nitrogen, circular flow be 7000 standard cubic meters/time.The isentropic efficiency of the equipment such as natural gas high pressure decompressor, natural gas medium-pressure decompressor, low pressure working fluid compressor, middle pressure Alternative Refrigerant Compressors and high-pressure working medium compressor gets 0.8, and mechanical efficiency gets 0.95.
A kind of concrete steps of the high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding are as follows:
(1) gas discharge regulation and control
Be transported to the 4.0MPa high-pressure natural gas at natural gas pressure regulating station by upstream trunk high pressure pipe network, its flow be 5.0 ten thousand standard cubic meters/time.High-pressure natural gas is divided into two strands after entering natural gas pressure regulating station: one is pressure regulation natural gas flow, flow be 3.0 ten thousand standard cubic meters/time, it first enters in conventional pressure regulator and is depressurized to 0.5MPa after flow valve A, then enters natural gas medium-pressure pipe network; Another stock for refrigeration natural gas flow, flow be 2.0 ten thousand standard cubic meters/time, it enters pressure energy and utilizes device after flow valve B, for junked tire low-temperature crushing device provides required cold energy; Because downstream natural gas consumption fluctuation can cause the natural gas processing amount at natural gas pressure regulating station to fluctuate in 2.5 ~ 6.0 ten thousand standard cubic meters/time round the clock, by adjust flux valve A and flow valve B, the flow of refrigeration natural gas flow is remained unchanged, and pressure regulation natural gas flow is at 0.5 ~ 4.0 ten thousand standard cubic meters/time variations, while keeping the use gas demand of downstream user, meet the cold energy supply of junked tire low-temperature crushing device.
(2) high-pressure natural gas pressure energy reclaims
In step (1) through refrigeration natural gas flow 2.0 ten thousand standard cubic meters of flow valve B/time be introduced in heat exchanger A with to flow out from low pressure working fluid compressor and to be transported to the low-pressure nitrogen heat exchange at natural gas pressure regulating station by hot insulated line, from 7000 standard cubic meters/time, after the low-pressure nitrogen of 124.7 DEG C absorbs 227.7kW heat, the temperature of refrigeration natural gas flow is increased to 37.2 DEG C from 15.0 DEG C, the pressure drop of natural gas flow of freezing in heat exchanger A is 0.05MPa, and pressure is reduced to 3.95MPa from 4.0MPa.The refrigeration natural gas flow flowed out from heat exchanger A enter in heat exchanger B with the 1.23MPa therefrom pressing Alternative Refrigerant Compressors to flow out, the medium pressure nitrogen gas heat exchange of 236.7 DEG C, the temperature of natural gas flow of freezing after absorbing 467.1kW heat is increased to 82.8 DEG C from 37.2 DEG C, because having the pressure loss in heat exchanger B, the pressure of refrigeration natural gas flow is reduced to 3.90MPa from 3.95MPa.Then this refrigeration natural gas flow enters in natural gas high pressure decompressor to expand and is depressurized to 1.10MPa, and the merit that natural gas high pressure decompressor exports is 585.3kW, in driving, press Alternative Refrigerant Compressors; And the refrigeration natural gas flow temperature after expanding is reduced to 7.5 DEG C, higher than the aqueous dew point temperature-6.5 DEG C of now natural gas, separate out without free water; This refrigeration natural gas flow is again through heat exchange C and the 0.24MPa flowed out from heat exchanger A, the low-pressure nitrogen heat exchange of 35.0 DEG C, and after absorbing 43.1kW heat, temperature is increased to 12.1 DEG C; After refrigeration natural gas flow overcomes the pressure loss 0.01MPa in heat exchanger C, Pressure Drop is to 1.09MPa, and then enter heat exchanger D and 136.1 DEG C, the heat exchange of 2.88MPa high pressure nitrogen of flowing out from high-pressure working medium compressor, after absorbing the heat of 285.8kW, temperature is increased to 42.8 DEG C; Refrigeration natural gas flow overcomes the pressure drop 0.30MPa in heat exchanger D, then enter in natural gas medium-pressure decompressor and be expanded to 0.55MPa, the merit 295.3kW that natural gas medium-pressure decompressor exports is for driving high-pressure working medium compressor, the refrigeration natural gas flow temperature flowed out from natural gas medium-pressure decompressor is reduced to 6.3 DEG C, still higher than its water dew point-14.0 DEG C, separate out without free water.27.0 DEG C of high pressure nitrogen heat exchange that this refrigeration natural gas flow flows out successively in heat exchanger E and from heat exchanger D, 55.0 DEG C of medium pressure nitrogen gas heat exchange of flowing out in heat exchanger F and from heat exchanger B, after refrigeration natural gas flow obtains heat 31.6kW and 77.2kW respectively from heat exchanger E and F, temperature is increased to 18.1 DEG C, overcome pressure drop in heat exchanger E, F 0.05MPa altogether simultaneously, enter in city after the Pressure Drop of refrigeration natural gas flow is low to moderate 0.50MPa and press gas distributing system (fecder system network).
(3) for the working medium kind of refrigeration cycle of junked tire low-temperature grinding
7000 standard cubic meters/time ,-118.6 DEG C, the low temperature nitrogen of 0.15MPa discharges cold energy for the precooling of junked tire, freezing and low-temperature grinding in junked tire low-temperature crushing device, temperature is increased to 10.0 DEG C, and pressure is 0.11MPa; This normal pressure nitrogen is through low pressure working fluid compressor boost to 0.29MPa, and temperature is increased to 124.7 DEG C, becomes low-pressure nitrogen; Low-pressure nitrogen to be transported to from junked tire low-temperature grinding plant area by pipeline in the natural gas pressure regulating station about 1kM, overcomes flow resistance and is about 0.02MPa; Low-pressure nitrogen first in heat exchanger A with 15 DEG C that flow out from flow valve B, 4.0MPa freezes natural gas flow heat exchange, after release 227.7kW heat, temperature is reduced to 35.0 DEG C, then through heat exchanger C and the refrigeration natural gas flow heat exchange of flowing out from natural gas high pressure decompressor, after low-pressure nitrogen release 43.1kW heat, temperature is reduced to 18.0 DEG C further, and then through in press Alternative Refrigerant Compressors to be pressurized to 1.23MPa to become medium pressure nitrogen gas; Middle pressure Alternative Refrigerant Compressors wasted work is about 585.3kW, Alternative Refrigerant Compressors medium pressure nitrogen temperature degree out is therefrom pressed to be increased to 236.7 DEG C, then 37.2 DEG C that flow out in heat exchanger B and from heat exchanger A natural gas flow heat exchange of freezing, after release 467.1kW heat, temperature is reduced to 55.0 DEG C, and then enter in heat exchanger F with 9.6 DEG C that flow out from heat exchanger E, the refrigeration natural gas flow heat exchange of 0.52MPa, heat exchange amount is 77.2kW, and temperature is reduced to 25.0 DEG C further; Medium pressure nitrogen gas after cooling enters high-pressure working medium compressor boost becomes high pressure nitrogen to 2.88MPa, and high-pressure working medium compressor wasted work is about 295.3kW; The temperature of high pressure nitrogen is about 136.1 DEG C, its successively through heat exchanger D with flow out from heat exchanger C 12.1 DEG C, 1.09MPa freezes natural gas flow, and through heat exchanger E with 6.3 DEG C that flow out from natural gas medium-pressure decompressor, the refrigeration natural gas flow of 0.55MPa carries out heat exchange, 285.7kW heat is discharged in heat exchanger D, temperature is reduced to 27.0 DEG C, and in heat exchanger E, discharges 31.6kW heat and be cooled to 15.0 DEG C further; Then this cooled high pressure nitrogen is transported to the junked tire low-temperature grinding plant area outside 1kM by hot insulated line, through working medium expander to 0.15MPa, nitrogen temperature is reduced to-118.6 DEG C, 305.4kW mechanical power can being exported for driving low pressure working fluid compressor simultaneously, forming working medium kind of refrigeration cycle.The round pressure drop that the nitrogen stream of circularly cooling is carried at utilidor is 0.03MPa, and the pressure drop in heat exchanger A, B, C, D, E, F is respectively 0.02MPa, 0.05MPa, 0.01MPa, 0.03MPa, 0.03MPa and 0.02MPa.
-118.6 DEG C of low temperature nitrogens exported from working medium decompressor send into junked tire low-temperature crushing devices, can be the precooling of junked tire, freezing and low-temperature grinding etc. and provide 326.8kW cold energy altogether, be equivalent to 2.83 tons/time the liquid nitrogen cold that provides.Produce 1 ton of fine glue powder according to current conventional method need consume 1 ton of liquid nitrogen and convert, natural gas pressure regulating station reclaim 2.0 ten thousand standard cubic meters/time, 4.0MPa high-pressure natural gas pressure energy refrigeration can meet production 2.83 tons/time fine glue powder cold energy demand, calculating in 8000 hours is run according to annual, fine glue powder 2.26 ten thousand tons can be produced every year, junked tire about 180 ~ 2,300,000 junked tires can be processed, environmental protection and resource circulation utilization benefit obvious.Relative to employing liquid nitrogen frozen comminuting method, 2.26 ten thousand tons of liquid nitrogen can be saved every year, energy-conservation value about 1,400 ten thousand yuan/year.And than adopting air turbine swell refrigeration, Alternative Refrigerant Compressors power consumption can be saved and be about 898kW, electric energy about 718.4 ten thousand kWh can be saved every year, energy-conservation value about 574.7 ten thousand yuan.
Embodiment two
For a high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding, as shown in Figure 2, adopt a decompressor, refrigeration working medium is nitrogen in its technological process.
The gas pressure being transported to city gas voltage regulating station from natural gas main pipeline network (high pressure pipe network) is 1.6MPa(absolute pressure), temperature is 15.0 DEG C, its volume consists of: methane 94.844%, ethane 2.353%, propane 0.309%, butane 0.079%, pentane 0.042%, hexane 0.032%, nitrogen 1.656%, carbon dioxide 0.655%, water 0.03%; The water dew point of this pipeline gas under 1.6MPa is-2.7 DEG C, and water dew point during 0.5MPa is-15.0 DEG C.In natural gas pressure regulating station, the high-pressure natural gas of 1.6MPa enters in city after needing to be depressurized to 0.5MPa and presses gas distributing system (fecder system network), average treatment amount be 4.0 ten thousand standard cubic meters/time, the minimum treating capacity at night be 2.3 ten thousand standard cubic meters/time, now utilize wherein 2.0 ten thousand standard cubic meters/time the pressure energy of high-pressure natural gas pressure regulation release for the production of the cryogenic cold energy of less than-100 DEG C, for the junked tire low-temperature crushing device outside natural gas pressure regulating station provides low-temperature receiver.The refrigeration working medium of junked tire low-temperature crushing device selects nitrogen, circular flow be 3800 standard cubic meters/time.The isentropic efficiency of the equipment such as natural gas high pressure decompressor, low pressure working fluid compressor, middle pressure Alternative Refrigerant Compressors and high-pressure working medium compressor gets 0.8, and mechanical efficiency gets 0.95.
A kind of concrete steps of the high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding are as follows:
(1) gas discharge regulation and control
Be transported to the 1.6MPa high-pressure natural gas at natural gas pressure regulating station by upstream trunk high pressure pipe network, its flow be 4.0 ten thousand standard cubic meters/time.High-pressure natural gas is divided into two strands after entering natural gas pressure regulating station: one is pressure regulation natural gas flow, flow be 2.0 ten thousand standard cubic meters/time, it first enters in conventional pressure regulator and is depressurized to 0.5MPa after flow valve A, then enters fecder system network; Another stock for refrigeration natural gas flow, flow be 2.0 ten thousand standard cubic meters/time, it enters pressure energy and utilizes device after flow valve B, for junked tire low-temperature crushing device provides required cold energy; Because downstream natural gas consumption fluctuation can cause the natural gas processing amount at natural gas pressure regulating station to fluctuate in 2.3 ~ 5.0 ten thousand standard cubic meters/time round the clock, by adjust flux valve A and flow valve B, the flow of refrigeration natural gas flow is remained unchanged, and pressure regulation natural gas flow is at 0.3 ~ 3.0 ten thousand standard cubic meters/time variations, while keeping the use gas demand of downstream user, meet the cold energy supply of junked tire low-temperature crushing device.
(2) high-pressure natural gas pressure energy reclaims
In step (1) through refrigeration natural gas flow 2.0 ten thousand standard cubic meters of flow valve B/time be introduced in heat exchanger A with to flow out from low pressure working fluid compressor and to be transported to the low-pressure nitrogen heat exchange at natural gas pressure regulating station by hot insulated line, from 3800 standard cubic meters/time, after the low-pressure nitrogen of 130.4 DEG C absorbs 131.5kW heat, the temperature of refrigeration natural gas flow is increased to 29.2 DEG C from 15.0 DEG C, the pressure drop of natural gas flow of freezing in heat exchanger A is 0.03MPa, and pressure is reduced to 1.57MPa from 1.6MPa.The refrigeration natural gas flow flowed out from heat exchanger A enter in heat exchanger B with the 0.89MPa therefrom pressing Alternative Refrigerant Compressors to flow out, the medium pressure nitrogen gas heat exchange of 190.5 DEG C, the temperature of natural gas flow of freezing after absorbing 202.1kW heat is increased to 50.0 DEG C from 29.2 DEG C, because having 0.03MPa pressure drop in heat exchanger B, the Pressure Drop of refrigeration natural gas flow is low to moderate 1.54MPa.Then this refrigeration natural gas flow enter again in heat exchanger D with the 2.92MPa flowed out from high-pressure working medium compressor, the high pressure nitrogen heat exchange of 209.0 DEG C, the temperature of natural gas flow of freezing after absorbing 203.7kW heat is increased to 71.0 DEG C further, the pressure drop of refrigeration natural gas flow in heat exchanger D is 0.03MPa, and the Pressure Drop of refrigeration natural gas flow is low to moderate 1.51MPa.Then, refrigeration natural gas flow enters in natural gas high pressure decompressor to expand and is depressurized to 0.55MPa, the merit that natural gas high pressure decompressor exports is 476.7kW, and in driving, press Alternative Refrigerant Compressors and high-pressure working medium compressor, the power consumption of two compressors is 238.4kW simultaneously; And the refrigeration natural gas flow temperature after expanding is reduced to 13.1 DEG C, higher than the aqueous dew point temperature-14.0 DEG C of now natural gas, separate out without free water; This refrigeration natural gas flow enters heat exchange C and the 0.26MPa flowed out from heat exchanger A, the low-pressure nitrogen heat exchange of 35.0 DEG C again, and after absorbing 12.4kW heat, temperature is increased to 14.4 DEG C; After refrigeration natural gas flow overcomes the pressure loss 0.01MPa in heat exchanger C, Pressure Drop is to 0.54MPa, and then enter heat exchanger E and 65.0 DEG C, the heat exchange of 2.90MPa high pressure nitrogen of flowing out from heat exchanger D, after absorbing the heat of 54.4kW, temperature is increased to 20.2 DEG C, overcome pressure drop in heat exchanger E 0.04MPa altogether simultaneously, enter in city after the Pressure Drop of refrigeration natural gas flow is low to moderate 0.50MPa and press gas distributing system (fecder system network).
(3) for the working medium kind of refrigeration cycle of junked tire low-temperature grinding
3800 standard cubic meters/time ,-112.5 DEG C, the low temperature nitrogen of 0.15MPa discharges cold energy for the precooling of junked tire, freezing and low-temperature grinding in junked tire low-temperature crushing device, temperature is increased to 10.0 DEG C, and pressure is 0.11MPa; This normal pressure nitrogen is through low pressure working fluid compressor boost to 0.31MPa, and temperature is increased to 130.4 DEG C, becomes low-pressure nitrogen; Low-pressure nitrogen to be transported to from junked tire low-temperature grinding plant area by pipeline in the natural gas pressure regulating station about 1kM, overcomes flow resistance and is about 0.03MPa; Low-pressure nitrogen first in heat exchanger A with 15 DEG C that flow out from flow valve B, 1.60MPa freezes natural gas flow heat exchange, after release 131.5kW heat, temperature is reduced to 35.0 DEG C, then through heat exchanger C and the refrigeration natural gas flow heat exchange of flowing out from natural gas high pressure decompressor, after low-pressure nitrogen release 12.4kW heat, temperature is reduced to 26.0 DEG C further, and then through in press Alternative Refrigerant Compressors to be pressurized to 0.89MPa to become medium pressure nitrogen gas; Middle pressure Alternative Refrigerant Compressors wasted work is about 238.4kW, Alternative Refrigerant Compressors medium pressure nitrogen temperature degree out is therefrom pressed to be increased to 190.5 DEG C, then 29.2 DEG C that flow out in heat exchanger B and from heat exchanger A natural gas flow heat exchange of freezing, after release 202.1kW heat, temperature is reduced to 45.0 DEG C, and then enter high-pressure working medium compressor boost and become high pressure nitrogen to 2.92MPa, high-pressure working medium compressor wasted work is about 238.4kW; The temperature of high pressure nitrogen is about 209.0 DEG C, then enter in heat exchanger D with 50.0 DEG C that flow out from heat exchanger B, 1.54MPa freezes natural gas flow heat exchange, heat exchange amount is 203.7kW.The high pressure nitrogen temperature flowed out from heat exchanger D is about 65.0 DEG C, then enter heat exchanger E with flow out from heat exchanger C 14.4 DEG C, the refrigeration natural gas flow of 0.54MPa carries out heat exchange, heat exchange load is 54.5kW, and high pressure nitrogen temperature is reduced to 27.0 DEG C, and pressure is 2.86MPa; Then this high pressure nitrogen is transported to the junked tire low-temperature grinding plant area outside 1kM by hot insulated line, through working medium expander to 0.15MPa, nitrogen temperature is reduced to-112.5 DEG C, can export 174.1kW mechanical power for driving low pressure working fluid compressor simultaneously, forms working medium kind of refrigeration cycle.The round pressure drop that the nitrogen stream of circularly cooling is carried at utilidor is 0.03MPa, and the pressure drop in heat exchanger A, B, C, D, E is respectively 0.02MPa, 0.02MPa, 0.01MPa, 0.02MPa, 0.01MPa.
-112.5 DEG C of low temperature nitrogens exported from working medium decompressor send into junked tire low-temperature crushing devices, can be the precooling of junked tire, freezing and low-temperature grinding etc. and provide 169kW cold energy altogether, be equivalent to 1.46 tons/time the liquid nitrogen cold that provides.Produce 1 ton of fine glue powder according to current conventional method need consume 1 ton of liquid nitrogen and convert, natural gas pressure regulating station reclaim 2.0 ten thousand standard cubic meters/time, 1.6MPa high-pressure natural gas pressure energy refrigeration can meet production 1.46 tons/time fine glue powder cold energy demand, calculating in 8000 hours is run according to annual, fine glue powder 1.17 ten thousand tons can be produced every year, junked tire about 95 ~ 1,200,000 junked tires can be processed, environmental protection and resource circulation utilization benefit obvious.Relative to employing liquid nitrogen frozen comminuting method, 1.17 ten thousand tons of liquid nitrogen can be saved every year, energy-conservation value about 7,000,000 yuan/year.And than adopting air turbine swell refrigeration, Alternative Refrigerant Compressors power consumption can be saved and be about 487.5kW, electric energy about 3,900,000 kWh can be saved every year, energy-conservation value about 3,120,000 yuan.
Embodiment three
For a high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding, as shown in Figure 3, adopt two decompressors, refrigeration working medium is air in its technological process.
The gas pressure being transported to city gas voltage regulating station from natural gas main pipeline network (high pressure pipe network) is 4.0MPa(absolute pressure), temperature is 15.0 DEG C, its volume consists of: methane 94.844%, ethane 2.353%, propane 0.309%, butane 0.079%, pentane 0.042%, hexane 0.032%, nitrogen 1.656%, carbon dioxide 0.655%, water 0.03%; The water dew point of this pipeline gas under 4.0MPa is 5.0 DEG C, and water dew point during 0.5MPa is-15.0 DEG C.In natural gas pressure regulating station, the high-pressure natural gas of 4.0MPa enters in city after needing to be depressurized to 0.5MPa and presses gas distributing system (fecder system network), average treatment amount be 4.0 ten thousand standard cubic meters/time, the minimum treating capacity at night be 2.5 ten thousand standard cubic meters/time, now utilize wherein 2.0 ten thousand standard cubic meters/time the pressure energy of high-pressure natural gas pressure regulation release for the production of the cryogenic cold energy of less than-100 DEG C, for the junked tire low-temperature crushing device outside natural gas pressure regulating station provides low-temperature receiver.The refrigeration working medium of junked tire low-temperature crushing device selects air, circular flow be 6500 standard cubic meters/time, adopt water as the intermediary of air and heat exchange gas.The isentropic efficiency of the equipment such as natural gas high pressure decompressor, natural gas medium-pressure decompressor, low pressure working fluid compressor, middle pressure Alternative Refrigerant Compressors and high-pressure working medium compressor gets 0.8, and mechanical efficiency gets 0.95.
A kind of concrete steps of the high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding are as follows:
(1) gas discharge regulation and control
Be transported to the 4.0MPa high-pressure natural gas at natural gas pressure regulating station by upstream trunk high pressure pipe network, its flow be 4.0 ten thousand standard cubic meters/time.High-pressure natural gas is divided into two strands after entering natural gas pressure regulating station: one is pressure regulation natural gas flow, flow be 2.0 ten thousand standard cubic meters/time, it first enters in conventional pressure regulator and is depressurized to 0.5MPa after flow valve A, then enters middle pressure gas distributing system; Another stock for refrigeration natural gas flow, flow be 2.0 ten thousand standard cubic meters/time, it enters pressure energy and utilizes device after flow valve B, for junked tire low-temperature crushing device provides required cold energy; Because downstream natural gas consumption fluctuation can cause the natural gas processing amount at natural gas pressure regulating station to fluctuate in 2.5 ~ 6.0 ten thousand standard cubic meters/time round the clock, by adjust flux valve A and flow valve B, the flow of refrigeration natural gas flow is remained unchanged, and pressure regulation natural gas flow is at 0.5 ~ 4.0 ten thousand standard cubic meters/time variations, while keeping the use gas demand of downstream user, meet the cold energy supply of junked tire low-temperature crushing device.
(2) high-pressure natural gas pressure energy reclaims
In step (1) through refrigeration natural gas flow 2.0 ten thousand standard cubic meters of flow valve B/time be introduced in heat exchanger A with flow out from water/air heat exchanger A 4.5 tons/time, 56.9 DEG C of recirculated water heat exchange, after absorbing 152.1kW heat from recirculated water, the temperature of refrigeration natural gas flow is increased to 29.8 DEG C from 15.0 DEG C, the pressure drop of natural gas flow of freezing in heat exchanger A is 0.03MPa, and pressure is reduced to 3.97MPa from 4.0MPa.The refrigeration natural gas flow flowed out from heat exchanger A enter in heat exchanger B with flow out from water/air heat exchanger B 4.5 tons/time, the recirculated water heat exchange of 90.9 DEG C, the temperature of natural gas flow of freezing after absorbing 283.3kW heat is increased to 57.6 DEG C from 29.8 DEG C, because having the pressure loss in heat exchanger B, the pressure of refrigeration natural gas flow is reduced to 3.94MPa from 3.97MPa.Then this refrigeration natural gas flow enters in natural gas high pressure decompressor to expand and is depressurized to 1.50MPa, and the merit that natural gas high pressure decompressor exports is 421.1kW, in driving, press Alternative Refrigerant Compressors; And the refrigeration natural gas flow temperature after expanding is reduced to 0.4 DEG C, higher than the aqueous dew point temperature-3.3 DEG C of now natural gas, separate out without free water; This refrigeration natural gas flow again through heat exchange C with flow out from heat exchanger B 4.5 tons/time, the recirculated water heat exchange of 41.0 DEG C, after absorbing 175.4kW heat, temperature is increased to 19.1 DEG C; After refrigeration natural gas flow overcomes the pressure loss 0.03MPa in heat exchanger C, Pressure Drop is to 1.47MPa, and then enter heat exchanger D with flow out from water/air heat exchanger D 5.0 tons/time, 90.5 DEG C of recirculated water heat exchange, after absorbing the heat of 381.5kW, temperature is increased to 59.2 DEG C; Refrigeration natural gas flow overcomes the pressure drop 0.40MPa in heat exchanger D, then enter in natural gas medium-pressure decompressor and be expanded to 0.53MPa, the merit 452.0kW that natural gas medium-pressure decompressor exports is for driving high-pressure working medium compressor, the refrigeration natural gas flow temperature flowed out from natural gas medium-pressure decompressor is reduced to 3.5 DEG C, higher than its water dew point-14.3 DEG C, separate out without free water.This refrigeration natural gas flow flow out in heat exchanger E and from heat exchanger D successively 5.0 tons/time, 30.0 DEG C of recirculated water heat exchange, after refrigeration natural gas flow absorbs 125.7kW, temperature is increased to 17.4 DEG C, overcome the pressure drop 0.03MPa in heat exchanger E simultaneously, enter in city and press gas distributing system (fecder system network) after the Pressure Drop of refrigeration natural gas flow is low to moderate 0.50MPa.
(3) for the working medium kind of refrigeration cycle of junked tire low-temperature grinding
6500 standard cubic meters/time ,-125.9 DEG C, the Cryogenic air of 0.15MPa discharges cold energy for the precooling of junked tire, freezing and low-temperature grinding in junked tire low-temperature crushing device, temperature is increased to 10.0 DEG C, and pressure is 0.11MPa; This atmospheric air is through low pressure working fluid compressor boost to 0.31MPa, and temperature is increased to 132.9 DEG C, becomes low-pressure air; Low-pressure air to be transported to from junked tire low-temperature grinding plant area by hot insulated line in the natural gas pressure regulating station about 1kM, overcomes flow resistance and is about 0.03MPa; Low-pressure air first flow out in water/air heat exchanger A and from heat exchanger C 10.0 DEG C, 4.5 tons/time recirculated water heat exchange, after release 265.2kW heat, temperature is reduced to 20.0 DEG C, and then presses Alternative Refrigerant Compressors to be pressurized to 1.00MPa in warp to become middle pressure air; Middle pressure Alternative Refrigerant Compressors wasted work is about 421.1kW, Alternative Refrigerant Compressors middle pressure air themperature out is therefrom pressed to be increased to 190.5 DEG C, then 30.0 DEG C that flow out in water/air heat exchanger B and from heat exchanger A, 4.5 tons/time recirculated water heat exchange, after release 345.5kW heat, temperature is reduced to 45.0 DEG C, and then enter in heat exchanger F with 15.9 DEG C, 5.0 tons that flow out from water/air heat exchanger C/time recirculated water heat exchange, heat exchange amount is 47.4kW, and temperature is reduced to 25.0 DEG C further; Middle pressure air after cooling enters high-pressure working medium compressor boost becomes pressure-air to 3.84MPa, and high-pressure working medium compressor wasted work is about 452.0kW; The temperature of pressure-air is about 208.1 DEG C, its 23.5 DEG C of flowing out in water/air heat exchanger D and from heat exchanger E successively, 5.0 tons/time recirculated water, and through water/air heat exchanger C with 10.0 DEG C, 5.0 tons that flow out from heat exchanger D/time recirculated water carry out heat exchange, 422.5kW heat is discharged in water/air heat exchanger D, temperature is reduced to 35.0 DEG C, and in water/air heat exchanger C, discharges 37.3kW heat and be cooled to 20.0 DEG C further; Then this cooled pressure-air is transported to the junked tire low-temperature grinding plant area outside 1kM by hot insulated line, through working medium expander to 0.15MPa, air themperature is reduced to-125.9 DEG C, 302.7kW mechanical power can being exported for driving low pressure working fluid compressor simultaneously, forming working medium kind of refrigeration cycle.The round pressure drop that the air logistics of circularly cooling is carried at utilidor is 0.03MPa, and the pressure drop in water/air heat exchanger A, B, C, D is respectively 0.02MPa, 0.03MPa, 0.02MPa, 0.01MPa, and the pressure drop in heat exchanger F is 0.02MPa.
6500 standard cubic meters exported from working medium decompressor/time ,-125.9 DEG C of Cryogenic air send into junked tire low-temperature crushing devices, can be the precooling of junked tire, freezing and low-temperature grinding etc. and 295.7kW cold energy be provided altogether, be equivalent to 2.56 tons/time the liquid nitrogen cold that provides.Produce 1 ton of fine glue powder according to current conventional method need consume 1 ton of liquid nitrogen and convert, at natural gas pressure regulating station by air as refrigeration working medium reclaim 2.0 ten thousand standard cubic meters/time, 4.0MPa high-pressure natural gas pressure energy refrigeration can meet production 2.56 tons/time fine glue powder cold energy demand, calculating in 8000 hours is run according to annual, fine glue powder 2.05 ten thousand tons can be produced every year, junked tire about 165 ~ 1,850,000 junked tires can be processed, environmental protection and resource circulation utilization benefit obvious.Relative to employing liquid nitrogen frozen comminuting method, 2.05 ten thousand tons of liquid nitrogen can be saved every year, energy-conservation value about 1,230 ten thousand yuan/year.And than adopting air turbine swell refrigeration, Alternative Refrigerant Compressors power consumption can be saved and be about 780kW, electric energy about 6,240,000 kWh can be saved every year, energy-conservation value about 499.2 ten thousand yuan.
Embodiment four
For a high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding, as shown in Figure 4, adopt a decompressor, refrigeration working medium is air in its technological process.
The gas pressure being transported to city gas voltage regulating station from natural gas main pipeline network (high pressure pipe network) is 1.6MPa(absolute pressure), temperature is 15.0 DEG C, its volume consists of: methane 94.844%, ethane 2.353%, propane 0.309%, butane 0.079%, pentane 0.042%, hexane 0.032%, nitrogen 1.656%, carbon dioxide 0.655%, water 0.03%; The water dew point of this pipeline gas under 1.6MPa is-2.7 DEG C, and water dew point during 0.5MPa is-15.0 DEG C.In natural gas pressure regulating station, the high-pressure natural gas of 1.6MPa enters in city after needing to be depressurized to 0.5MPa and presses gas distributing system (fecder system network), average treatment amount be 4.0 ten thousand standard cubic meters/time, the minimum treating capacity at night be 2.3 ten thousand standard cubic meters/time, now utilize wherein 2.0 ten thousand standard cubic meters/time the pressure energy of high-pressure natural gas pressure regulation release for the production of the cryogenic cold energy of less than-100 DEG C, for the junked tire low-temperature crushing device outside natural gas pressure regulating station provides low-temperature receiver.The refrigeration working medium of junked tire low-temperature crushing device selects air, circular flow be 3500 standard cubic meters/time.The isentropic efficiency of the equipment such as natural gas high pressure decompressor, low pressure working fluid compressor, middle pressure Alternative Refrigerant Compressors and high-pressure working medium compressor gets 0.8, and mechanical efficiency gets 0.95.
A kind of concrete steps of the high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding are as follows:
Be transported to the 1.6MPa high-pressure natural gas at natural gas pressure regulating station by upstream trunk high pressure pipe network, its flow be 4.0 ten thousand standard cubic meters/time.High-pressure natural gas is divided into two strands after entering natural gas pressure regulating station: one is pressure regulation natural gas flow, flow be 2.0 ten thousand standard cubic meters/time, it first enters in conventional pressure regulator and is depressurized to 0.5MPa after flow valve A, then enters middle pressure gas distributing system; Another stock for refrigeration natural gas flow, flow be 2.0 ten thousand standard cubic meters/time, it enters pressure energy and utilizes device after flow valve B, for junked tire low-temperature crushing device provides required cold energy; Because downstream natural gas consumption fluctuation can cause the natural gas processing amount at natural gas pressure regulating station to fluctuate in 2.3 ~ 5.0 ten thousand standard cubic meters/time round the clock, by adjust flux valve A and flow valve B, the flow of refrigeration natural gas flow is remained unchanged, and pressure regulation natural gas flow is at 0.3 ~ 3.0 ten thousand standard cubic meters/time variations, while keeping the use gas demand of downstream user, meet the cold energy supply of junked tire low-temperature crushing device.
(2) high-pressure natural gas pressure energy reclaims
In step (1) through refrigeration natural gas flow 2.0 ten thousand standard cubic meters of flow valve B/time be introduced in heat exchanger A with flow out from water/air heat exchanger A 2.6 tons/time, 58.8 DEG C of recirculated water heat exchange, after absorbing 94.5kW heat from recirculated water, the temperature of refrigeration natural gas flow is increased to 24.9 DEG C from 15.0 DEG C, the pressure drop of natural gas flow of freezing in heat exchanger A is 0.03MPa, and pressure is reduced to 1.57MPa from 1.6MPa.The refrigeration natural gas flow flowed out from heat exchanger A enter in heat exchanger B with flow out from water/air heat exchanger B 2.6 tons/time, the recirculated water heat exchange of 90.6 DEG C, the temperature of natural gas flow of freezing after absorbing 166.1kW heat is increased to 42.4 DEG C from 24.9 DEG C, because having the pressure loss in heat exchanger B, the pressure of refrigeration natural gas flow is reduced to 1.55MPa from 3.97MPa.Then this refrigeration natural gas flow enter in heat exchanger D with flow out from water/air heat exchanger C 2.8 tons/time, 93.7 DEG C of recirculated waters carry out heat exchange, after refrigeration natural gas flow absorbs 137.0kW heat, temperature is increased to 56.6 DEG C further, after overcoming the pressure drop 0.02MPa of heat transfer process, refrigeration natural gas flow enters in natural gas high pressure decompressor to expand and is depressurized to 0.54MPa, the merit that natural gas high pressure decompressor exports is 466.8kW, in driving, press Alternative Refrigerant Compressors and high-pressure working medium compressor, load is 233.4kW; And the refrigeration natural gas flow temperature after expanding is reduced to-1.4 DEG C, higher than the aqueous dew point temperature-14.1 DEG C of now natural gas, separate out without free water; This refrigeration natural gas flow again through heat exchange C with flow out from heat exchanger B 2.6 tons/time, the recirculated water heat exchange of 40.0 DEG C, after absorbing 81.7kW heat, temperature is increased to 7.7 DEG C; After refrigeration natural gas flow overcomes the pressure loss 0.02MPa in heat exchanger C, Pressure Drop is to 0.52MPa, and then enter in heat exchanger E with flow out from heat exchanger D 2.8 tons/time, 55.0 DEG C of recirculated water heat exchange, after absorbing the heat of 105.6kW, temperature is increased to 19.2 DEG C, overcome the pressure drop 0.02MPa in heat exchanger E simultaneously, enter in city and press gas distributing system (fecder system network) after the Pressure Drop of refrigeration natural gas flow is low to moderate 0.50MPa.
(3) for the working medium kind of refrigeration cycle of junked tire low-temperature grinding
3500 standard cubic meters/time ,-115.5 DEG C, the Cryogenic air of 0.15MPa discharges cold energy for the precooling of junked tire, freezing and low-temperature grinding in junked tire low-temperature crushing device, temperature is increased to 10.0 DEG C, and pressure is 0.11MPa; This atmospheric air is through low pressure working fluid compressor boost to 0.33MPa, and temperature is increased to 138.4 DEG C, becomes low-pressure air; Low-pressure air to be transported to from junked tire low-temperature grinding plant area by hot insulated line in the natural gas pressure regulating station about 1kM, overcomes flow resistance and is about 0.03MPa; Low-pressure air first flow out in water/air heat exchanger A and from heat exchanger C 15.0 DEG C, 2.6 tons/time recirculated water heat exchange, after release 143.5kW heat, temperature is reduced to 25.0 DEG C, and then presses Alternative Refrigerant Compressors to be pressurized to 1.00MPa in warp to become middle pressure air; Middle pressure Alternative Refrigerant Compressors wasted work is about 233.4kW, Alternative Refrigerant Compressors middle pressure air themperature out is therefrom pressed to be increased to 200.3 DEG C, then 30.0 DEG C that flow out in water/air heat exchanger B and from heat exchanger A, 2.6 tons/time recirculated water heat exchange, after release 198.7W heat, temperature is reduced to 45.0 DEG C, and then enter high-pressure working medium compressor boost and become pressure-air to 3.60MPa, high-pressure working medium compressor wasted work is about 233.4kW; The temperature of pressure-air is about 220.0 DEG C, and then enter in water/air heat exchanger C and circulate carry out heat exchange with flow out from heat exchanger E 25.0 DEG C, 2.8 tons/time, after discharging 242.5kW heat, pressure-air temperature is reduced to 35.0 DEG C; Then this cooled pressure-air is transported to the junked tire low-temperature grinding plant area outside 1kM by hot insulated line, through working medium expander to 0.15MPa, air themperature is reduced to-115.5 DEG C, 170.3kW mechanical power can being exported for driving low pressure working fluid compressor simultaneously, forming working medium kind of refrigeration cycle.The round pressure drop that the air logistics of circularly cooling is carried at utilidor is 0.03MPa, and the pressure drop in water/air heat exchanger A, B, C is respectively 0.03MPa, 0.02MPa, 0.03MPa.
3500 standard cubic meters exported from working medium decompressor/time ,-115.5 DEG C of Cryogenic air send into junked tire low-temperature crushing devices, can be the precooling of junked tire, freezing and low-temperature grinding etc. and 158.6kW cold energy be provided altogether, be equivalent to 1.37 tons/time the liquid nitrogen cold that provides.Produce 1 ton of fine glue powder according to current conventional method need consume 1 ton of liquid nitrogen and convert, at natural gas pressure regulating station by air as refrigeration working medium reclaim 2.0 ten thousand standard cubic meters/time, 1.6MPa high-pressure natural gas pressure energy refrigeration can meet production 1.37 tons/time fine glue powder cold energy demand, calculating in 8000 hours is run according to annual, fine glue powder 1.10 ten thousand tons can be produced every year, junked tire about 90 ~ 1,000,000 junked tires can be processed, environmental protection and resource circulation utilization benefit obvious.Relative to employing liquid nitrogen frozen comminuting method, 1.10 ten thousand tons of liquid nitrogen can be saved every year, energy-conservation value about 6,600,000 yuan/year.And than adopting air turbine swell refrigeration, Alternative Refrigerant Compressors power consumption can be saved and be about 419kW, electric energy about 335.2 ten thousand kWh can be saved every year, energy-conservation value about 268.2 ten thousand yuan.。
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.

Claims (9)

1., for a high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding, it is characterized in that comprising the following steps:
First be by decompressor, the pressure energy of high-pressure natural gas is converted to mechanical power and cold energy in natural gas pressure regulating station; Then mechanical power and cold energy that refrigeration working medium produces for communication medium recycling high-pressure natural gas expands is utilized, on the one hand mechanical power being used for compression refrigeration working medium becomes high-pressure refrigeration working medium, on the other hand by optimal design heat-exchange network, the cold energy utilizing high-pressure natural gas expansion to produce carrys out the high-pressure refrigeration working medium after cooled compressed, and the intake air temperature of the high-pressure natural gas entering decompressor can be improved, increase the mechanical power that high-pressure natural gas expansion produces; Then hot insulated line is utilized, the high-pressure refrigeration working medium of cooling is transported to the junked tire low-temperature grinding plant area outside natural gas pressure regulating station, then high-pressure refrigeration working medium is by the cryogenic cold energy of less than-100 DEG C needed for working medium expander generation junked tire low-temperature grinding process, the mechanical power that high-pressure refrigeration working medium expansion simultaneously produces is for having utilized the preliminary supercharging of the refrigeration working medium after cold energy, and then by hot insulated line, the refrigeration working medium after preliminary supercharging is transmitted back to natural gas pressure regulating station, form kind of refrigeration cycle;
The swell refrigeration of described high-pressure natural gas pressure energy and removal process are arranged on region, natural gas pressure regulating station, the preliminary pressurization of the swell refrigeration of refrigeration working medium, the cold energy use of junked tire low-temperature crushing device and the refrigeration working medium after having utilized cold energy is arranged on the junked tire low-temperature grinding plant area outside natural gas pressure regulating station, these two regions transport connection by refrigeration working medium, realize the transmission of energy.
2., according to a kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding according to claim 1, it is characterized in that comprising the following steps:
A. high-pressure natural gas flow control:
Be transported to the high-pressure natural gas at natural gas pressure regulating station by upstream high pipe network, its pressure is at more than 1.6MPa; High-pressure natural gas is divided into two strands after entering natural gas pressure regulating station: one is pressure regulation natural gas flow, and it first enters in conventional pressure regulator and is depressurized to 0.4 ~ 0.5MPa after flow valve A, then enters fecder system network; Another stock is refrigeration natural gas flow, and it enters pressure energy and utilizes device after flow valve B, for junked tire low-temperature crushing device provides required cold energy; When fluctuation occurs downstream natural gas consumption or junked tire low-temperature crushing device chilling requirement changes, by adjust flux valve A and flow valve B, the cold energy demand using gas demand and junked tire low-temperature crushing device of downstream user can be met simultaneously;
B. high-pressure natural gas pressure energy reclaims:
In step a through the refrigeration natural gas flow of flow valve B first by heat exchanger A with to flow out from low pressure working fluid compressor and to be transported to the low voltage refrigeration working medium heat exchange at natural gas pressure regulating station by hot insulated line, again by heat exchanger B and the middle pressure refrigeration working medium heat exchange of therefrom pressing Alternative Refrigerant Compressors to flow out, after obtaining heat, temperature is increased to 50 ~ 100 DEG C; Then refrigeration natural gas flow enters in natural gas high pressure decompressor to expand and carries out step-down, the mechanical power that natural gas high pressure decompressor exports is used for pressing Alternative Refrigerant Compressors in driving, the natural gas temperature simultaneously flowed out from natural gas high pressure decompressor reduces, and makes its temperature higher than the water dew point of natural gas by regulating the outlet pressure of natural gas high pressure decompressor; When the transmission & distribution pressure of the gas pressure flowed out from natural gas high pressure decompressor still higher than fecder system network, this refrigeration natural gas flow is again through heat exchanger C and the low voltage refrigeration working medium heat exchange of flowing out from heat exchanger A, and through heat exchanger D and the high-pressure refrigeration working medium heat exchange of flowing out from high-pressure working medium compressor, after absorbing heat, the temperature of refrigeration natural gas flow is increased to 20 ~ 60 DEG C; Then the natural gas flow that freezes enters in natural gas medium-pressure decompressor to expand and is depressurized to 0.4 ~ 0.6MPa, the mechanical power that natural gas medium-pressure decompressor exports is for driving high-pressure working medium compressor, the refrigeration natural gas flow temperature simultaneously flowed out from natural gas medium-pressure decompressor reduces, but its temperature is still higher than the water dew point of natural gas; After this, the high-pressure refrigeration working medium heat exchange that refrigeration natural gas flow flows out successively in heat exchanger E and from heat exchanger D, in heat exchanger F Yu from heat exchanger B flows out, press refrigeration working medium heat exchange, the temperature of refrigeration natural gas flow is increased to after more than 10 DEG C and enters fecder system network;
C. for the working medium kind of refrigeration cycle of junked tire low-temperature grinding:
Cryogenic refrigeration working medium discharges cold energy for the precooling of junked tire, freezing and low-temperature grinding in junked tire low-temperature crushing device, and temperature is increased to normal temperature, and pressure is close to normal pressure, this normal pressure refrigeration working medium is through low pressure working fluid compressor boost to 0.2 ~ 0.4MPa, and temperature is increased to 90 ~ 150 DEG C, becomes low voltage refrigeration working medium, low voltage refrigeration working medium is transported in contiguous natural gas pressure regulating station by hot insulated line from junked tire low-temperature grinding plant area, the refrigeration natural gas flow heat exchange that low voltage refrigeration working medium elder generation flows out in heat exchanger A and from flow valve B, temperature is reduced to higher than the refrigeration natural gas flow flowed out from flow valve B 10 ~ 25 DEG C, then through heat exchanger C and the refrigeration natural gas flow heat exchange of flowing out from natural gas high pressure decompressor, low voltage refrigeration Temperature of Working is reduced to 10 ~ 30 DEG C further, and then press Alternative Refrigerant Compressors supercharging to become middle pressure refrigeration working medium in warp, its pressure and temperature is determined by the output work size of natural gas high pressure decompressor, therefrom press the refrigeration natural gas flow heat exchange that Alternative Refrigerant Compressors middle pressure refrigeration working medium out flows out in heat exchanger B and from heat exchanger A, temperature is reduced to 30 ~ 60 DEG C, then in heat exchanger F Yu in flowing out from heat exchanger E, press natural gas flow heat exchange, temperature is reduced to 10 ~ 40 DEG C further, middle pressure refrigeration working medium after cooling enters high-pressure working medium compressor boost to 2.5 ~ 3.5MPa, becomes high-pressure refrigeration working medium, and the temperature and pressure of high-pressure refrigeration working medium is determined by the output work size of natural gas medium-pressure decompressor, high-pressure refrigeration working medium again through heat exchanger D and the refrigeration natural gas flow heat exchange of flowing out from heat exchanger C, and through heat exchanger E with from natural gas medium-pressure decompressor flows out, press natural gas flow to carry out heat exchange, the temperature of high-pressure refrigeration working medium is reduced to 10 ~ 40 DEG C, the high-pressure refrigeration working medium of cooling is transported to junked tire low-temperature grinding plant area by hot insulated line, then through working medium expander to 0.15 ~ 0.20MPa, temperature is reduced to less than-100 DEG C, this cryogenic refrigeration working medium sends into junked tire low-temperature crushing device, for precooling, the freezing and low-temperature grinding of junked tire, the mechanical power of working medium expander output simultaneously, for driving low pressure working fluid compressor, forms working medium kind of refrigeration cycle.
3., according to a kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding according to claim 1, it is characterized in that:
The high-pressure natural gas pressure entering natural gas pressure regulating station is in the scope of 1.6 ~ 10.0MPa;
The decompressor quantity used is one or two;
When the high-pressure natural gas pressure entering natural gas pressure regulating station is at 2.0 ~ 10.0MPa, two decompressors need be used, comprise natural gas high pressure decompressor and natural gas medium-pressure decompressor, high-pressure natural gas is successively through two-stage step-down, and Pressure Drop is low to moderate the distribution pressure of fecder system network; And the outlet temperature of natural gas high pressure decompressor and natural gas medium-pressure decompressor is higher than the water dew point of natural gas;
When the high-pressure natural gas pressure entering natural gas pressure regulating station is at 1.6 ~ 2.0MPa, only need use a decompressor, this decompressor is natural gas high pressure decompressor, and high-pressure natural gas is through one-level step-down, and Pressure Drop is low to moderate the distribution pressure of fecder system network; And the outlet temperature by regulating the flow of the flow and refrigeration working medium that flow through the natural gas of decompressor to control natural gas high pressure decompressor, make it the water dew point higher than natural gas.
4., according to a kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding according to claim 1, it is characterized in that: described decompressor and working medium decompressor are turbo-expander or screw expander.
5., according to a kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding according to claim 1, it is characterized in that: described refrigeration working medium is nitrogen, argon gas or air; When refrigeration working medium is air, air and high-pressure natural gas carry out indirect heat exchange by water as heat exchange medium, and water first absorbs heat from the refrigeration working medium of high temperature, and then for heating high-pressure natural gas.
6. according to a kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding according to claim 3, it is characterized in that: described refrigeration working medium is through low pressure working fluid compressor, middle pressure Alternative Refrigerant Compressors and the supercharging of high-pressure working medium compressor three stage compression;
The mechanical power that low pressure working fluid compressor is produced by working medium decompressor drives;
When use two decompressors, the mechanical power that middle pressure Alternative Refrigerant Compressors is produced by natural gas high pressure decompressor drives, and the mechanical power that high-pressure working medium compressor is produced by natural gas medium-pressure decompressor drives;
When a use decompressor, the mechanical power that middle pressure Alternative Refrigerant Compressors and high-pressure working medium compressor produce by natural gas high pressure decompressor drives.
7. according to a kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding according to claim 1, it is characterized in that: the heat energy that described refrigeration working medium compression supercharging produces all by heat exchanger for being heated by the natural gas of decompressor, and the high-pressure natural gas cold energy produced that expands all is used for the cooling after refrigeration working medium compression by heat exchanger.
8. according to a kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding according to claim 1, it is characterized in that: described high-pressure natural gas is divided into two strands, one enters fecder system network again for user after controlling to enter conventional pressure regulator by flow valve A, and one is controlled to enter decompressor by flow valve B.
9. according to a kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding according to claim 8, it is characterized in that: the cold energy temperature that described refrigeration working medium produces in junked tire low-temperature grinding plant area, the flow that on the one hand can control natural gas by the aperture of adjust flux valve B regulates, and can regulate on the other hand by regulating the internal circulating load of refrigeration working medium; The flow increasing natural gas and the flow reducing refrigeration working medium are to reduce cold energy temperature, and the flow reducing natural gas and the flow increasing refrigeration working medium are to raise cold energy temperature.
CN201310513654.XA 2013-10-25 2013-10-25 A kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding Active CN103629840B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310513654.XA CN103629840B (en) 2013-10-25 2013-10-25 A kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310513654.XA CN103629840B (en) 2013-10-25 2013-10-25 A kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding

Publications (2)

Publication Number Publication Date
CN103629840A CN103629840A (en) 2014-03-12
CN103629840B true CN103629840B (en) 2015-10-21

Family

ID=50211137

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310513654.XA Active CN103629840B (en) 2013-10-25 2013-10-25 A kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding

Country Status (1)

Country Link
CN (1) CN103629840B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106369935B (en) * 2016-10-27 2022-04-12 西南石油大学 Air separation system and method utilizing pressure energy of high-pressure natural gas pipe network
CN106839484B (en) * 2016-11-16 2019-11-15 深圳市燃气集团股份有限公司 One kind being based on CO2The pressure energy of natural gas of refrigerant utilizes device
CN108467747A (en) * 2017-02-23 2018-08-31 何巨堂 The UF membrane of the hydrocarbon cold gas separated by high pressure separator of material hydrogenation process and off-gas expander application method
CN108034465A (en) * 2017-09-22 2018-05-15 宋敏 A kind of moisture stress expansion recycles dewatering process
CN111286048A (en) * 2020-03-25 2020-06-16 宁夏颐星新材料科技有限公司 Production process of polyvinyl alcohol powder

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07190524A (en) * 1993-12-28 1995-07-28 Ishikawajima Harima Heavy Ind Co Ltd Refrigerating cycle
KR20040107161A (en) * 2003-06-12 2004-12-20 주식회사 포스코 Turbocharger refrigerator using directly high pressure gas
CN101551060A (en) * 2009-04-30 2009-10-07 华南理工大学 Method and device for integrated utilization of natural gas pipe network pressure energy refrigeration and hydrate
CN101852529A (en) * 2010-05-28 2010-10-06 华南理工大学 Method and device for efficient utilization of pressure energy of natural gas pipeline network

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07190524A (en) * 1993-12-28 1995-07-28 Ishikawajima Harima Heavy Ind Co Ltd Refrigerating cycle
KR20040107161A (en) * 2003-06-12 2004-12-20 주식회사 포스코 Turbocharger refrigerator using directly high pressure gas
CN101551060A (en) * 2009-04-30 2009-10-07 华南理工大学 Method and device for integrated utilization of natural gas pipe network pressure energy refrigeration and hydrate
CN101852529A (en) * 2010-05-28 2010-10-06 华南理工大学 Method and device for efficient utilization of pressure energy of natural gas pipeline network

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
天然气管网压力能用于废旧橡胶粉碎的制冷装置;熊永强等;《现代化工》;20070131;第27卷(第1期);第49-52页 *

Also Published As

Publication number Publication date
CN103629840A (en) 2014-03-12

Similar Documents

Publication Publication Date Title
CN102967099B (en) Energy cascade comprehensive utilization method of LNG (liquefied natural gas) cold energy
CN103629840B (en) A kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding
CN105865149B (en) A method of producing liquid air using cold energy of liquefied natural gas
CN101852529B (en) Method and device for efficient utilization of pressure energy of natural gas pipeline network
CN101806293B (en) Integrating and optimizing method for improving generation efficiency of liquefied natural gas cold energy
CN204301358U (en) Phase change cold-storage formula LNG cold energy utilization device
CN101551060B (en) Method and device for integrated utilization of natural gas pipe network pressure energy refrigeration and hydrate
CN103791690B (en) Utilize the liquefied natural gas (LNG) production device and method that pipeline pressure can generate electricity-freeze
CN104863645A (en) Efficient pipe network natural gas pressure energy and cold energy recycling and utilization system
CN202868298U (en) Gradient utilization system of LNG (Liquefied Natural Gas) cold energy
CN105444523A (en) Reliquefaction system and technique for compressing expanded liquified BOG through BOG
CN105041395A (en) System for recovering and comprehensively utilizing pressure energy of natural gas pipeline network
CN211692583U (en) Natural gas excess pressure distributed utilization system
CN108005739A (en) Using the LNG cold energy stepped utilization methods of cold energy generation
CN204984493U (en) Utilize electricity generation of natural gas pressure energy inflation and compression refrigeration's integrated device
CN203758165U (en) Liquefied natural gas production device applicable in electricity generation and refrigeration by pipeline pressure energy
CN204923571U (en) Thermoelectric cold trigeminy supplies system based on heat pump technique and compressed air electric power storage technique
CN205262059U (en) Energy -efficient BOG recovery unit
CN204477679U (en) A kind of LNG warehouse BOG recycling system
CN105333693A (en) Efficient and energy-saving BOG (boil-off gas) recycling device
CN206160625U (en) Utilize air separation system of high -pressure natural gas pipe network pressure ability
CN110185506B (en) Pressure energy comprehensive utilization system of natural gas pressure regulating station
Lian et al. Research on high efficient utilization of LNG cold energy
CN106640241A (en) Natural gas pipe network pressure energy power generation and refrigeration house method and device
CN101871717B (en) Complete equipment for CO2 recycling with CO2 vaporization and cool recycling device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant