CN103629840A - High-pressure natural gas pressure energy refrigeration method for junked tire cryogenic pulverization - Google Patents

High-pressure natural gas pressure energy refrigeration method for junked tire cryogenic pulverization Download PDF

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CN103629840A
CN103629840A CN201310513654.XA CN201310513654A CN103629840A CN 103629840 A CN103629840 A CN 103629840A CN 201310513654 A CN201310513654 A CN 201310513654A CN 103629840 A CN103629840 A CN 103629840A
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pressure
natural gas
refrigeration
working medium
temperature
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CN103629840B (en
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熊永强
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Jinan University
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Jinan University
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Abstract

The invention relates to a high-pressure natural gas pressure energy refrigeration method for junked tire cryogenic pulverization. The pressure energy of high-pressure natural gas is converted into mechanical work and cold energy through an expansion machine in a natural gas regulator station. The mechanical work and the cold energy are recycled through refrigerants, the mechanical work is used for compressing the refrigerants, the compressed high-pressure refrigerants are cooled through an optimally-designed heat exchange network through the cold energy generated through the expansion of the high-pressure natural gas, the gas inlet temperature of the high-pressure natural gas entering the expansion machine is improved, and the mechanical work generated by the expansion of the high-pressure natural gas is increased. The cooled high-pressure refrigerants are conveyed to a junked tire cryogenic pulverization area through a heat preservation pipeline, low-temperature cold energy below -100DEG C is generated by the high-pressure refrigerants through the refrigerant expansion machine, the mechanical work generated by the expansion of the high-pressure refrigerants is used for the primary pressure boost of the refrigerants with the cold energy used up, the refrigerants are conveyed back to the natural gas regulator station, and a refrigerating cycle is formed. The high-pressure natural gas pressure energy refrigeration method has the advantages of effectively utilizing energy and preventing ice blockage, and belongs to the field of natural gas pressure energy utilization.

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 occupies third place in the world after having surpassed the 1.5 Yi Tiao，Ji U.S., Japan, and produce every year junked tire and surpass 100,000,000, and with annual double-digit speed increment.The accumulation land occupation of a large amount of damaged tires, not only causes the waste of resource, and because junked tire is heat cured polymeric material, very difficult degraded, increasingly sharpen " black pollution ”Gei China originally the ecological environment of fragility make the matter worse.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, the recycling of junked tire, " black pollution " that is not only conducive to prevent that junked tire from causing, and contribute to utilize regenerated resources, break away from rubber scarcity of resources.
The recycling of junked tire mainly contains heat energy utilization, reclaimed rubber is produced and rubber powder is prepared this three kinds of methods, and for avoiding producing secondary pollution problem, current developed country generally takes that waste old pulverizing is made to rubber powder and recycled.Rubber powder directly or after modification can be 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 that adds rubber powder modified, than prevailing roadway, can increase the service life 1～3 times, reduce noise 50～70%, improve heat-resisting, the cold resistance on road surface, strengthen skid resistance, improved safety coefficient, and can save construction investment.
Junked tire is pulverized and to be divided into that normal temperature is pulverized and two kinds of low-temperature grinding.Normal temperature crushing up equipment is simple, treating capacity is large, cost is lower, but the rubber powder particle diameter of producing is thicker, generally 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 the material of having relatively high expectations for serviceability and goods (as thermoplastic elastomer (TPE), special type protection coating, radial etc.) must adopt fine glue powders more than 100 orders.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 is to adopt the liquid nitrogen spraying of-196.0 ℃ to carry out frozen rubber, and then at low temperatures rubber is ground; 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, than the liquid nitrogen consumption of external similar technology, significantly reduce.But because liquid nitrogen price is more expensive, the production cost of rubber powder is still higher, in order to reduce refrigeration cost, China has developed air turbine expander refrigeration comminuting method.
Chinese utility model patent ZL86207494 has proposed a kind of air turbine continuous cooling device, by air compressing, dry, then in turbine, expands and obtains the Cryogenic air of-100 ℃, can pulverize for the cryogenic freezing of junked tire.
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 has proposed a kind of method of preparing rubber powder with junked tire, this patent is taked air compressing, dry, then utilize freon refrigerator multi-sectional refrigerating, then by turbine adiabatic expansion, obtain the cold air of-110 ℃～-130 ℃, 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 requirement of the less superfinishing fine powder of production particle diameter is lower, the cold energy needing is more, and production cost is higher.Due to production cost compare Gao， industrially developed country, the recovery of waste old and processing are had to subsidy.And China's fine and ultra tiny rubber powder of production mainly adopts air swell refrigeration comminuting method and liquid nitrogen cryogenics comminuting method, due to junked tire purchase and processing nothing are subsidized, the fine glue powder of production small particle diameter because of energy consumption for cooling high, cause cost high, seriously restricted 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 reducing fine glue powder production cost, promote that junked tire recycles the development of industry significant.
Along with developing rapidly of Gas Industry, China has accelerated the construction of gas distributing system, expects the year two thousand twenty China and will build up the Gao Long-distance Transmission Pipeline of 50,000 kms, and 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, as the distribution pressure of " 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 several imported L NG projects of having built up, the pressure of its High Pressure Gas Transmitting Pipeline is also all more than 7.0MPa.The downstream user of natural gas mainly contains plant gas, gas, industry and commerce user etc. at present, the natural gas that wherein enters gas turbine power generation in plant gas requires pressure in 2.0MPa left and right, and the middle pressure pressure of gas line network of gas is generally all below 0.5MPa.Therefore, the natural gas in high pressure pipe network conventionally need to be at a minute defeated station, urban gate station, natural gas pressure regulating station etc. will carry out step-down and could supply with user's use.Natural gas has a large amount of pressure energies to utilize in step-down process, 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 having lost in door Zhan, Fen Shuzhanhe voltage regulating station.Therefore, make full use of the pressure energy of gas distributing system, can reduce energy loss, 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 of utilizing high-pressure natural gas pressure energy refrigeration.
Chinese invention patent (application) 200810026979.4 has proposed a kind of high-pressure natural gas that utilizes directly by the technological process of unpowered refrigeration machine decompressional expansion refrigeration, can obtain the cold energy between-40 ℃～-100 ℃.Owing to adopting direct expansion in this patent, the mechanical energy of not utilizing expansion process to produce, has only utilized the cold energy that expands and produce, therefore the utilization ratio of pressure energy is lower, less than 50%.And the cold energy temperature producing is higher, be not easy to obtain-100 ℃ of following low temperature, the low-temperature grinding that is not suitable for junked tire is produced fine glue powder.And in pipe natural gas expansion temperature-fall period, the moisture when temperature is too low in natural gas can be separated out freeze occluding device and pipeline.According to stipulating in national standard < < code for design of gas transmission pipeline engineering > > (GB50251-2003): the water dew point that enters the gas of gas pipeline should be lower 5 ℃ than minimum environment temperature under transport condition.At present, the water dew point temperature of the most of pipeline gas of China is in summer all more than 0 ℃, and winter is between-5 ℃～-15 ℃.Therefore, directly decompressional expansion extremely can cause more serious ice to block up phenomenon below-40 ℃.
Chinese invention patent 200510037532.3 and Chinese invention patent (application) 201210128345.6 proposed to utilize the technological process of high-pressure natural gas pressure energy swell refrigeration liquefied natural gas.These two patents, by pre-cold-peace swell refrigeration, can produce-100 ℃ of following cryogenic natural gas.But it is too low to lower the temperature, same easily the freezing of pipeline gas produces the stifled phenomenon of ice, and impact is produced, and need to invest expensive dehydration, depickling facility reduces water and carbon dioxide content, and operating cost is also higher.
Chinese invention patent (application) 201110412697.X has proposed a kind of method of utilizing the generating of pipe network pressure energy of natural gas and ice making.In the method, utilize on the one hand high-pressure natural gas direct expansion generating, the low temperature producing that on the other hand natural gas expanded is used for ice making.The method has not only been utilized the mechanical energy of high-pressure natural gas expansion generation, and can utilize the cold energy of generation.But the method expands, the cold energy temperature producing is higher, generally-20～-30 ℃ of left and right, and cannot be for the low-temperature grinding of junked tire.
From above-mentioned existing report, junked tire low-temperature grinding is made to the cold energy that fine glue powder needs to consume-100 ℃ of following temperature, reduce the key of energy consumption for cooling and the extensive recycling that cost is junked tire of rubber powder production process.High-pressure natural gas expands not only can produce a large amount of mechanical energy, and can produce cryogenic cold energy, but because most of pipeline gas water dew point temperature is higher, stifled in order to prevent that cooling from causing e-quipment and pipe to produce ice, the temperature after natural gas expansion step-down is unsuitable too low.Therefore, in junked tire cryogenic crushing process, how to utilize fully the pressure energy of gas distributing system to produce the cold energy below-100 ℃, for the utilization ratio that improves pressure energy of natural gas, have very important significance with the low-temperature grinding cost that reduces junked tire.
Summary of the invention
In order to overcome above-mentioned existing high-pressure natural gas pressure energy, utilize that the efficiency existing in method is lower, pipeline gas cooling easily produces the stifled phenomenon of ice, cold energy temperature is higher, and cannot meet the problem of producing fine glue powder demand, 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, preventing that pipeline gas from producing under 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-100 ℃ of following temperature, for the production of fine glue powder.
Object of the present invention is achieved through the following technical solutions:
A high-pressure natural gas pressure energy refrigeration method for waste old low-temperature grinding, comprises following operating procedure: be first by decompressor, the pressure energy of high-pressure natural gas to be converted to mechanical power and cold energy in natural gas pressure regulating station; Then the mechanical power and the cold energy that utilize refrigeration working medium to expand and produce for communication medium recycling high-pressure natural gas, on the one hand mechanical power being used for to compression refrigeration working medium becomes high-pressure refrigeration working medium, on the other hand by optimal design heat-exchange network, the cold energy that utilizes high-pressure natural gas expansion to produce carrys out the high-pressure refrigeration working medium after cooled compressed, and can improve the intake air temperature of the high-pressure natural gas that enters decompressor, increase the mechanical power that high-pressure natural gas expands and produces; Then utilize hot insulated line, cooling high-pressure refrigeration working medium is transported to the junked tire low-temperature grinding plant area outside natural gas pressure regulating station, then high-pressure refrigeration working medium is expanded and is produced required-100 ℃ of following cryogenic cold energy of junked tire low-temperature grinding process by working medium decompressor, 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.
A high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding, comprises the following steps:
A. high-pressure natural gas flow control:
By upstream high pressure pipe network, be transported to the high-pressure natural gas at natural gas pressure regulating station, its pressure is in 1.6MPa(absolute pressure, and the pressure below occurring 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 middle pressure pipe net; Another strand is refrigeration natural gas flow, and it enters pressure energy use device after flow valve B, for junked tire low-temperature crushing device provides required cold energy; When downstream natural gas consumption fluctuation or junked tire low-temperature crushing device chilling requirement occur changes, by adjust flux valve A and flow valve B, can meet the cold energy demand with gas demand and junked tire low-temperature crushing device of downstream user 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 from low pressure working fluid compressor, flow out and be transported to by hot insulated line the low pressure refrigeration working medium heat exchange at natural gas pressure regulating station, by heat exchanger B and the middle pressure refrigeration working medium heat exchange of therefrom pressing Alternative Refrigerant Compressors to flow out, after acquisition heat, temperature is increased to 50～100 ℃ again; Then refrigeration natural gas flow enters in natural gas high pressure decompressor and expands and carry out step-down, the mechanical power of natural gas high pressure decompressor output is pressed Alternative Refrigerant Compressors for driving, the natural gas temperature simultaneously flowing out from natural gas high pressure decompressor reduces, by regulating the outlet pressure of natural gas high pressure decompressor to make its temperature higher than the water dew point (summer, winter was higher than-5 ℃ higher than 0 ℃) of natural gas; When the gas pressure flowing out from natural gas high pressure decompressor still higher than during the transmission & distribution pressure of pressure pipe net, this refrigeration natural gas flow is again through heat exchanger C and the low pressure 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, absorb after heat, the temperature of refrigeration natural gas flow is increased to 20～60 ℃; Then the natural gas flow that freezes enters in natural gas medium-pressure decompressor and expands and be depressurized to 0.4～0.6MPa, the mechanical power of natural gas medium-pressure decompressor output is used for driving high-pressure working medium compressor, the refrigeration natural gas flow temperature simultaneously flowing out from natural gas medium-pressure decompressor reduces, but its temperature is still higher than the water dew point of natural gas; After this, refrigeration natural gas flow successively in heat exchanger E with the high-pressure refrigeration working medium heat exchange of flowing out from heat exchanger D, in heat exchanger F with from heat exchanger B, flow out the heat exchange of pressure refrigeration working medium, the temperature of refrigeration natural gas flow is increased to 10 ℃ and enters middle pressure pipe net after above;
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 approaches 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 ℃, becomes low pressure refrigeration working medium, low pressure refrigeration working medium is transported in contiguous natural gas pressure regulating station from junked tire low-temperature grinding plant area by hot insulated line, low pressure refrigeration working medium first in heat exchanger A with the refrigeration natural gas flow heat exchange of flowing out from flow valve B, temperature is reduced to higher 10～25 ℃ than the refrigeration natural gas flow flowing out from flow valve B, then through heat exchanger C and the refrigeration natural gas flow heat exchange of flowing out from natural gas high pressure decompressor, low pressure refrigeration working medium temperature is further reduced to 10～30 ℃, 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 Alternative Refrigerant Compressors middle pressure refrigeration working medium out in heat exchanger B with the refrigeration natural gas flow heat exchange of flowing out from heat exchanger A, temperature is reduced to 30～60 ℃, then in heat exchanger F with the middle pressure natural gas flow heat exchange of flowing out from heat exchanger E, temperature is further reduced to 10～40 ℃, 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 is 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, flow out pressure natural gas flow carry out heat exchange, the temperature of high-pressure refrigeration working medium is reduced to 10～40 ℃, cooling high-pressure refrigeration working medium is transported to junked tire low-temperature grinding plant area by hot insulated line, then through working medium decompressor, be expanded to 0.15～0.20MPa, temperature is reduced to below-100 ℃, this cryogenic refrigeration working medium is sent into junked tire low-temperature crushing device, precooling, freezing and low-temperature grinding for junked tire, the mechanical power of the output of working medium decompressor expansion is simultaneously used for driving low pressure working fluid compressor, forms working medium kind of refrigeration cycle.
The scope of the high-pressure natural gas pressure that enters natural gas pressure regulating station in 1.6～10.0MPa; The decompressor quantity of using is one or two; When the high-pressure natural gas pressure that enters natural gas pressure regulating station is during at 2.0～10.0MPa, need to use two decompressors, comprise natural gas high pressure decompressor and natural gas medium-pressure decompressor, high-pressure natural gas passes through two-stage step-down successively, and pressure decreased is to the distribution pressure of middle pressure pipe net; 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 that enters natural gas pressure regulating station is during at 1.6～2.0MPa, only need to use a decompressor, this decompressor is natural gas high pressure decompressor, and high-pressure natural gas is through one-level step-down, and pressure decreased is to the distribution pressure of middle pressure pipe net; And by adjusting, flow through the flow of natural gas of decompressor and the outlet temperature that the flow of refrigeration working medium is controlled 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 three grades of compression superchargings of high-pressure working medium compressor; The mechanical power that low pressure working fluid compressor is produced by working medium decompressor drives; When using 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 using a decompressor, the mechanical power that middle pressure Alternative Refrigerant Compressors and high-pressure working medium compressor produce by natural gas high pressure decompressor drives.
The heat energy that refrigeration working medium compression supercharging produces all be used for heating the natural gas by decompressor by heat exchanger, and high-pressure natural gas cooling after being all used for refrigeration working medium and compressing by heat exchanger of the cold energy that produces of expanding.
High-pressure natural gas is divided into two strands, and in entering after flow valve A control enters conventional pressure regulator, pressure pipe net is for user again for one, and one is controlled and entered 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 can control natural gas by the aperture of adjust flux valve B on the one hand regulates, on the other hand can be by regulating the internal circulating load of refrigeration working medium to regulate; The flow that increases the flow of natural gas and reduce refrigeration working medium is to reduce cold energy temperature, and the flow that reduces the flow of natural gas and increase refrigeration working medium is with rising 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 cold energy use of the swell refrigeration of refrigeration working medium, junked tire low-temperature crushing device and utilized the preliminary pressurization of the refrigeration working medium after cold energy to be arranged on the junked tire low-temperature grinding plant area outside natural gas pressure regulating station, the transmission of energy, by the connection that transports of refrigeration working medium, is realized in these two regions.
The present invention has following advantage and effect with respect 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 of mutually changing based on energy, utilize pressure energy to expand and can produce cryogenic cold energy and mechanical power by decompressor, and mechanical power is greater than the characteristic of cold energy, overcome simultaneously because of high-pressure natural gas expand after temperature must cannot directly produce the shortcoming of required-100 ℃ of following cryogenic cold energy of junked tire low-temperature grinding higher than its water dew point, propose a kind of refrigeration working medium that utilizes and reclaimed mechanical power that high-pressure natural gas expand to produce and the refrigerating method of cold energy simultaneously, not only can all reclaim mechanical power and cold energy that high-pressure natural gas expands and produces, and can produce-100 ℃ of following cryogenic cold energy for the low-temperature grinding of junked tire, for the low-temperature grinding of 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 heat energy of refrigeration working medium compression generation and the refrigeration natural gas flow expansion of high pressure are produced obtains cascade utilization, by reclaiming the heat energy of refrigeration working medium compression generation, be used for improving the intake air temperature that enters natural gas high pressure decompressor and natural gas medium-pressure decompressor on the one hand, increase the mechanical power that refrigeration natural gas flow expands and produces, the cold energy cooling refrigeration working medium of utilizing on the other hand refrigeration natural gas flow to expand and produce, can save investment and the operating cost of the rear required cooling infrastructure of refrigeration working medium compression, 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 to 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 to be located at the same area and to cause the phase mutual interference at aspects such as fire-fighting, safety and lands used, be conducive to safety in production and management.And refrigeration working medium all carries more than normal temperature, the cold energy loss of avoiding direct transporting low temperature working medium to produce.
(4) the present invention is-100 ℃ of following cryogenic cold energy that junked tire low-temperature crushing device provides by recycling the pressure energy of high-pressure natural gas pipe network, does not need extraneous other energy that consume, and energy consumption for cooling is very low.Simultaneously, by the optimal design of system, utilize the refrigerating method of high-pressure natural gas pressure energy to there is stronger operation flexible, when the high-pressure natural gas flowed fluctuation at natural gas pressure regulating station and junked tire low-temperature crushing device production load fluctuation, all can normal operating.Whole process provides thermal source and low-temperature receiver without the external world, and can ensure that in high-pressure natural gas expansion step-down process, temperature, all the time higher than water dew point, avoids producing the stifled phenomenon of ice.
(5) the present invention adopts one or two decompressor to carry out step-down, applied widely.When adopting two decompressor two-stage step-downs, avoid pressure gas distributing system distribution pressure from high pressure is directly once depressured to, cause making because expansion ratio is excessive natural gas temperature after expanding lower than its water dew point temperature, produce the situation of freeze occluding device and pipeline; When adopting a decompressor one-level step-down, can, directly at the distribution pressure that utilizes the direct expansion of natural gas high pressure decompressor to middle pressure gas distributing system, simplify the structure of pressure energy use device.
(6) inexhaustible when adopting, with it air without cease during as refrigeration working medium, in heat transfer process, because making air mix with natural gas, equipment fault there is security incident, so air carries out indirect heat exchange by water as heat exchange medium with refrigeration natural gas flow, effectively guarantees handling safety.
Accompanying drawing explanation
Fig. 1 is the operational flowchart of the inventive method embodiment mono-
Fig. 2 is the operational flowchart of the inventive method embodiment bis-;
Fig. 3 is the operational flowchart of the inventive method embodiment tri-;
Fig. 4 is the operational flowchart of the inventive method embodiment tetra-;
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; In 12-, press Alternative Refrigerant Compressors; 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:
The specific embodiment
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 to this, for not dated especially technological parameter, can carry out with reference to routine techniques.
Embodiment mono-
For a high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding, its technological process as shown in Figure 1, adopts two decompressors to realize secondary step-down to high-pressure natural gas, and refrigeration working medium is selected nitrogen.
The high-pressure natural gas pressure that is 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 ℃, 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 ℃, and water dew point during 0.5MPa is-15.0 ℃.In natural gas pressure regulating station, the high-pressure natural gas of 4.0MPa need to be depressurized to enter after 0.5MPa presses gas distributing system (middle pressure pipe net) in city, average treatment amount is 5.0 ten thousand standard cubic meters/time, the minimum treating capacity at night is 2.5 ten thousand standard cubic meters/time, now utilize the pressure energy of the wherein high-pressure natural gas pressure regulation release in 2.0 ten thousand standard cubic meters/time for the production of-100 ℃ of following cryogenic cold energy, 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 is selected nitrogen, and circular flow is 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
By upstream trunk high pressure pipe network, be transported to the 4.0MPa high-pressure natural gas at natural gas pressure regulating station, its flow is 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, and flow is 3.0 ten thousand standard cubic meters/time, and 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 strand is refrigeration natural gas flow, and flow is 2.0 ten thousand standard cubic meters/time, and it enters pressure energy use device after flow valve B, for junked tire low-temperature crushing device provides required cold energy; Because can causing the natural gas processing amount at natural gas pressure regulating station, downstream natural gas consumption fluctuation in 2.5～6.0 ten thousand standard cubic meters/time, fluctuates round the clock, by adjust flux valve A and flow valve B, the flow of natural gas flow of making to freeze remains unchanged, and pressure regulation natural gas flow changed in 0.5～4.0 ten thousand standard cubic meters/time, when 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
Through refrigeration natural gas flow 2.0 ten thousand standard cubic meters/time of flow valve B, be introduced in heat exchanger A in step (1) and from low pressure working fluid compressor, flow out and be transported to by hot insulated line the low-pressure nitrogen heat exchange at natural gas pressure regulating station, from 7000 standard cubic meters/time, the low-pressure nitrogen of 124.7 ℃, absorb 227.7kW heat, the temperature of refrigeration natural gas flow is increased to 37.2 ℃ from 15.0 ℃, 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 flowing out from heat exchanger A enters in heat exchanger B and therefrom presses the 1.23MPa of Alternative Refrigerant Compressors outflow, the medium pressure nitrogen gas heat exchange of 236.7 ℃, the temperature that absorbs the natural gas flow that freezes after 467.1kW heat is increased to 82.8 ℃ from 37.2 ℃, because have 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 and expands and be depressurized to 1.10MPa, and the merit of natural gas high pressure decompressor output is 585.3kW, for driving, presses Alternative Refrigerant Compressors; And refrigeration natural gas flow temperature after expanding is reduced to 7.5 ℃, higher than water dew point temperature-6.5 ℃ of natural gas now, without free water, separate out; This refrigeration natural gas flow is again through heat exchange C and the 0.24MPa flowing out from heat exchanger A, the low-pressure nitrogen heat exchange of 35.0 ℃, and after absorption 43.1kW heat, temperature is increased to 12.1 ℃; After refrigeration natural gas flow overcomes the pressure loss 0.01MPa in heat exchanger C, Pressure Drop is to 1.09MPa, and then entering heat exchanger D and 136.1 ℃, the heat exchange of 2.88MPa high pressure nitrogen of from high-pressure working medium compressor, flowing out, after the heat of absorption 285.8kW, temperature is increased to 42.8 ℃; 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 of natural gas medium-pressure decompressor output is used for driving high-pressure working medium compressor, the refrigeration natural gas flow temperature flowing out from natural gas medium-pressure decompressor is reduced to 6.3 ℃, still, higher than its water dew point-14.0 ℃, without free water, separate out.This refrigeration natural gas flow successively in heat exchanger E with 27.0 ℃ of high pressure nitrogen heat exchange of flowing out from heat exchanger D, in heat exchanger F with 55.0 ℃ of medium pressure nitrogen gas heat exchange of flowing out from heat exchanger B, after refrigeration natural gas flow obtains respectively heat 31.6kW and 77.2kW from heat exchanger E and F, temperature is increased to 18.1 ℃, overcome pressure drop in heat exchanger E, F 0.05MPa altogether, the pressure decreased of refrigeration natural gas flow is pressed gas distributing system (middle pressure pipe net) to entering after 0.50MPa in city simultaneously.
(3) for the working medium kind of refrigeration cycle of junked tire low-temperature grinding
In 7000 standard cubic meters/time ,-118.6 ℃, the low temperature nitrogen of 0.15MPa, discharge 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 10.0 ℃, 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 ℃, becomes low-pressure nitrogen; Low-pressure nitrogen in junked tire low-temperature grinding plant area is transported to the natural gas pressure regulating station about 1kM, overcomes the about 0.02MPa of flow resistance by pipeline; Low-pressure nitrogen first in heat exchanger A with 15 ℃ that from flow valve B, flow out, the heat exchange of 4.0MPa refrigeration natural gas flow, after discharging 227.7kW heat, temperature is reduced to 35.0 ℃, 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 discharges 43.1kW heat, temperature is further reduced to 18.0 ℃, and then through in press Alternative Refrigerant Compressors to be pressurized to 1.23MPa to become medium pressure nitrogen gas; The about 585.3kW of middle pressure Alternative Refrigerant Compressors wasted work, therefrom press Alternative Refrigerant Compressors medium pressure nitrogen temperature degree to be out increased to 236.7 ℃, then in heat exchanger B with the heat exchange of flow out from heat exchanger A 37.2 ℃ refrigeration natural gas flows, after discharging 467.1kW heat, temperature is reduced to 55.0 ℃, and then enter in heat exchanger F and 9.6 ℃ that from heat exchanger E, flow out, the refrigeration natural gas flow heat exchange of 0.52MPa, heat exchange amount is 77.2kW, and temperature is further reduced to 25.0 ℃; Medium pressure nitrogen gas after cooling enters high-pressure working medium compressor boost becomes high pressure nitrogen to 2.88MPa, the about 295.3kW of high-pressure working medium compressor wasted work; The temperature of high pressure nitrogen is about 136.1 ℃, it is successively through heat exchanger D and 12.1 ℃ of flowing out from heat exchanger C, the 1.09MPa natural gas flow that freezes, and carry out heat exchange through heat exchanger E with 6.3 ℃ that flow out from natural gas medium-pressure decompressor, the refrigeration natural gas flow of 0.55MPa, in heat exchanger D, discharge 285.7kW heat, temperature is reduced to 27.0 ℃, and in heat exchanger E, discharges 31.6kW heat and be further cooled to 15.0 ℃; Then this high pressure nitrogen being cooled is transported to the junked tire low-temperature grinding plant area outside 1kM by hot insulated line, through working medium decompressor, be expanded to 0.15MPa, nitrogen temperature is reduced to-118.6 ℃, can export 305.4kW mechanical power for driving low pressure working fluid compressor, form working medium kind of refrigeration cycle simultaneously.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.
From-118.6 ℃ of low temperature nitrogens of working medium decompressor output, send into junked tire low-temperature crushing device, can be the precooling of junked tire, freezing and low-temperature grinding etc. 326.8kW cold energy is provided altogether, be equivalent to 2.83 tons/time the liquid nitrogen cold that provides.According to 1 ton of fine glue powder of current conventional method production, need consume 1 ton of liquid nitrogen converts, the pressure energy refrigeration that reclaims 2.0 ten thousand standard cubic meters/time, 4.0MPa high-pressure natural gas at natural gas pressure regulating station can meet the cold energy demand of 2.83 tons of productions/time fine glue powder, according to annual operation, within 8000 hours, calculate, can produce every year 2.26 ten thousand tons of fine glue powders, can process approximately 180～2,300,000 junked tires of junked tire, environmental protection and resource circulation utilization benefit are obvious.With respect to adopting liquid nitrogen frozen comminuting method, can save every year 2.26 ten thousand tons of liquid nitrogen, approximately 1,400 ten thousand yuan/year of energy-conservation value.And than adopting air turbine swell refrigeration, can save the about 898kW of Alternative Refrigerant Compressors power consumption, can save every year electric energy approximately 718.4 ten thousand kWh, approximately 574.7 ten thousand yuan of energy-conservation value.
Embodiment bis-
For a high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding, its technological process as shown in Figure 2, adopts a decompressor, and refrigeration working medium is nitrogen.
The gas pressure that is 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 ℃, 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 ℃, and water dew point during 0.5MPa is-15.0 ℃.In natural gas pressure regulating station, the high-pressure natural gas of 1.6MPa need to be depressurized to enter after 0.5MPa presses gas distributing system (middle pressure pipe net) in city, average treatment amount is 4.0 ten thousand standard cubic meters/time, the minimum treating capacity at night is 2.3 ten thousand standard cubic meters/time, now utilize the pressure energy of the wherein high-pressure natural gas pressure regulation release in 2.0 ten thousand standard cubic meters/time for the production of-100 ℃ of following cryogenic cold energy, 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 is selected nitrogen, and circular flow is 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
By upstream trunk high pressure pipe network, be transported to the 1.6MPa high-pressure natural gas at natural gas pressure regulating station, its flow is 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, and flow is 2.0 ten thousand standard cubic meters/time, and it first enters in conventional pressure regulator and is depressurized to 0.5MPa after flow valve A, then enters middle pressure pipe net; Another strand is refrigeration natural gas flow, and flow is 2.0 ten thousand standard cubic meters/time, and it enters pressure energy use device after flow valve B, for junked tire low-temperature crushing device provides required cold energy; Because can causing the natural gas processing amount at natural gas pressure regulating station, downstream natural gas consumption fluctuation in 2.3～5.0 ten thousand standard cubic meters/time, fluctuates round the clock, by adjust flux valve A and flow valve B, the flow of natural gas flow of making to freeze remains unchanged, and pressure regulation natural gas flow changed in 0.3～3.0 ten thousand standard cubic meters/time, when 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
Through refrigeration natural gas flow 2.0 ten thousand standard cubic meters/time of flow valve B, be introduced in heat exchanger A in step (1) and from low pressure working fluid compressor, flow out and be transported to by hot insulated line the low-pressure nitrogen heat exchange at natural gas pressure regulating station, from 3800 standard cubic meters/time, the low-pressure nitrogen of 130.4 ℃, absorb 131.5kW heat, the temperature of refrigeration natural gas flow is increased to 29.2 ℃ from 15.0 ℃, 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 flowing out from heat exchanger A enters in heat exchanger B and therefrom presses the 0.89MPa of Alternative Refrigerant Compressors outflow, the medium pressure nitrogen gas heat exchange of 190.5 ℃, the temperature that absorbs the natural gas flow that freezes after 202.1kW heat is increased to 50.0 ℃ from 29.2 ℃, because there is 0.03MPa pressure drop in heat exchanger B, the pressure decreased of refrigeration natural gas flow is to 1.54MPa.Then this refrigeration natural gas flow enters in heat exchanger D and from the 2.92MPa of high-pressure working medium compressor outflow, the high pressure nitrogen heat exchange of 209.0 ℃ again, the temperature that absorbs the natural gas flow that freezes after 203.7kW heat is further increased to 71.0 ℃, the pressure drop of refrigeration natural gas flow in heat exchanger D is 0.03MPa, and the pressure decreased of refrigeration natural gas flow is to 1.51MPa.Then, refrigeration natural gas flow enters in natural gas high pressure decompressor and expands and be depressurized to 0.55MPa, the merit of natural gas high pressure decompressor output is 476.7kW, and for drive and press Alternative Refrigerant Compressors and high-pressure working medium compressor simultaneously, the power consumption of two compressors is 238.4kW; And refrigeration natural gas flow temperature after expanding is reduced to 13.1 ℃, higher than water dew point temperature-14.0 ℃ of natural gas now, without free water, separate out; This refrigeration natural gas flow enters heat exchange C and the 0.26MPa flowing out from heat exchanger A, the low-pressure nitrogen heat exchange of 35.0 ℃ again, and after absorption 12.4kW heat, temperature is increased to 14.4 ℃; After refrigeration natural gas flow overcomes the pressure loss 0.01MPa in heat exchanger C, Pressure Drop is to 0.54MPa, and then 65.0 ℃, the heat exchange of 2.90MPa high pressure nitrogen entering heat exchanger E and flow out from heat exchanger D, after the heat of absorption 54.4kW, temperature is increased to 20.2 ℃, overcome pressure drop in heat exchanger E 0.04MPa altogether, the pressure decreased of refrigeration natural gas flow is pressed gas distributing system (middle pressure pipe net) to entering after 0.50MPa in city simultaneously.
(3) for the working medium kind of refrigeration cycle of junked tire low-temperature grinding
In 3800 standard cubic meters/time ,-112.5 ℃, the low temperature nitrogen of 0.15MPa, discharge 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 10.0 ℃, 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 ℃, becomes low-pressure nitrogen; Low-pressure nitrogen in junked tire low-temperature grinding plant area is transported to the natural gas pressure regulating station about 1kM, overcomes the about 0.03MPa of flow resistance by pipeline; Low-pressure nitrogen first in heat exchanger A with 15 ℃ that from flow valve B, flow out, the heat exchange of 1.60MPa refrigeration natural gas flow, after discharging 131.5kW heat, temperature is reduced to 35.0 ℃, 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 discharges 12.4kW heat, temperature is further reduced to 26.0 ℃, and then through in press Alternative Refrigerant Compressors to be pressurized to 0.89MPa to become medium pressure nitrogen gas; The about 238.4kW of middle pressure Alternative Refrigerant Compressors wasted work, therefrom press Alternative Refrigerant Compressors medium pressure nitrogen temperature degree to be out increased to 190.5 ℃, then in heat exchanger B with the heat exchange of flow out from heat exchanger A 29.2 ℃ refrigeration natural gas flows, after discharging 202.1kW heat, temperature is reduced to 45.0 ℃, and then enter high-pressure working medium compressor boost and to 2.92MPa, become high pressure nitrogen, the about 238.4kW of high-pressure working medium compressor wasted work; The temperature of high pressure nitrogen is about 209.0 ℃, 50.0 ℃, the heat exchange of 1.54MPa refrigeration natural gas flow then entering in heat exchanger D and flow out from heat exchanger B, and heat exchange amount is 203.7kW.The high pressure nitrogen temperature flowing out from heat exchanger D is about 65.0 ℃, then enter heat exchanger E and carry out heat exchange with the refrigeration natural gas flow of 14.4 ℃ of flowing out, 0.54MPa from heat exchanger C, heat exchange load is 54.5kW, and high pressure nitrogen temperature is reduced to 27.0 ℃, 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 decompressor, be expanded to 0.15MPa, nitrogen temperature is reduced to-112.5 ℃, 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.
From-112.5 ℃ of low temperature nitrogens of working medium decompressor output, send into junked tire low-temperature crushing device, can be the precooling of junked tire, freezing and low-temperature grinding etc. 169kW cold energy is provided altogether, be equivalent to 1.46 tons/time the liquid nitrogen cold that provides.According to 1 ton of fine glue powder of current conventional method production, need consume 1 ton of liquid nitrogen converts, the pressure energy refrigeration that reclaims 2.0 ten thousand standard cubic meters/time, 1.6MPa high-pressure natural gas at natural gas pressure regulating station can meet the cold energy demand of 1.46 tons of productions/time fine glue powder, according to annual operation, within 8000 hours, calculate, can produce every year 1.17 ten thousand tons of fine glue powders, can process approximately 95～1,200,000 junked tires of junked tire, environmental protection and resource circulation utilization benefit are obvious.With respect to adopting liquid nitrogen frozen comminuting method, can save every year 1.17 ten thousand tons of liquid nitrogen, approximately 7,000,000 yuan/year of energy-conservation value.And than adopting air turbine swell refrigeration, can save the about 487.5kW of Alternative Refrigerant Compressors power consumption, can save every year electric energy approximately 3,900,000 kWh, approximately 3,120,000 yuan of energy-conservation value.
Embodiment tri-
For a high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding, its technological process as shown in Figure 3, adopts two decompressors, and refrigeration working medium is air.
The gas pressure that is 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 ℃, 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 ℃, and water dew point during 0.5MPa is-15.0 ℃.In natural gas pressure regulating station, the high-pressure natural gas of 4.0MPa need to be depressurized to enter after 0.5MPa presses gas distributing system (middle pressure pipe net) in city, average treatment amount is 4.0 ten thousand standard cubic meters/time, the minimum treating capacity at night is 2.5 ten thousand standard cubic meters/time, now utilize the pressure energy of the wherein high-pressure natural gas pressure regulation release in 2.0 ten thousand standard cubic meters/time for the production of-100 ℃ of following cryogenic cold energy, 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 is selected air, and circular flow is 6500 standard cubic meters/time, adopts 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
By upstream trunk high pressure pipe network, be transported to the 4.0MPa high-pressure natural gas at natural gas pressure regulating station, its flow is 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, and flow is 2.0 ten thousand standard cubic meters/time, and 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 strand is refrigeration natural gas flow, and flow is 2.0 ten thousand standard cubic meters/time, and it enters pressure energy use device after flow valve B, for junked tire low-temperature crushing device provides required cold energy; Because can causing the natural gas processing amount at natural gas pressure regulating station, downstream natural gas consumption fluctuation in 2.5～6.0 ten thousand standard cubic meters/time, fluctuates round the clock, by adjust flux valve A and flow valve B, the flow of natural gas flow of making to freeze remains unchanged, and pressure regulation natural gas flow changed in 0.5～4.0 ten thousand standard cubic meters/time, when 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/time of flow valve B be introduced in heat exchanger A with 4.5 tons that from water/air heat exchanger A, flow out/time, 56.9 ℃ of recirculated water heat exchange, from recirculated water absorbs 152.1kW heat, the temperature of refrigeration natural gas flow is increased to 29.8 ℃ from 15.0 ℃, 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 flowing out from heat exchanger A enter in heat exchanger B with 4.5 tons that from water/air heat exchanger B, flow out/time, the recirculated water heat exchange of 90.9 ℃, the temperature that absorbs the natural gas flow that freezes after 283.3kW heat is increased to 57.6 ℃ from 29.8 ℃, because have 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 and expands and be depressurized to 1.50MPa, and the merit of natural gas high pressure decompressor output is 421.1kW, for driving, presses Alternative Refrigerant Compressors; And refrigeration natural gas flow temperature after expanding is reduced to 0.4 ℃, higher than water dew point temperature-3.3 ℃ of natural gas now, without free water, separate out; This refrigeration natural gas flow is again through heat exchange C and 4.5 tons of flowing out from heat exchanger B/time, the recirculated water heat exchange of 41.0 ℃, absorb 175.4kW heat after temperature be increased to 19.1 ℃; 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 and 5.0 tons of flowing out/time, 90.5 ℃ of recirculated water heat exchange from water/air heat exchanger D, absorb the heat of 381.5kW after temperature be increased to 59.2 ℃; 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 of natural gas medium-pressure decompressor output is used for driving high-pressure working medium compressor, the refrigeration natural gas flow temperature flowing out from natural gas medium-pressure decompressor is reduced to 3.5 ℃, higher than its water dew point-14.3 ℃, without free water, separate out.This refrigeration natural gas flow successively in heat exchanger E with 5.0 tons of flowing out from heat exchanger D/time, 30.0 ℃ of recirculated water heat exchange, after refrigeration natural gas flow absorbs 125.7kW, temperature is increased to 17.4 ℃, overcome the pressure drop 0.03MPa in heat exchanger E, the pressure decreased of refrigeration natural gas flow is pressed gas distributing system (middle pressure pipe net) to entering after 0.50MPa in city simultaneously.
(3) for the working medium kind of refrigeration cycle of junked tire low-temperature grinding
In 6500 standard cubic meters/time ,-125.9 ℃, the Cryogenic air of 0.15MPa, discharge 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 10.0 ℃, 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 ℃, becomes low-pressure air; Low-pressure air in junked tire low-temperature grinding plant area is transported to the natural gas pressure regulating station about 1kM, overcomes the about 0.03MPa of flow resistance by hot insulated line; Low-pressure air first in water/air heat exchanger A with 10.0 ℃, 4.5 tons that from heat exchanger C, flow out/time recirculated water heat exchange, discharge 265.2kW heat after temperature be reduced to 20.0 ℃, and then through in press Alternative Refrigerant Compressors to be pressurized to 1.00MPa to become middle pressure air; The about 421.1kW of middle pressure Alternative Refrigerant Compressors wasted work, therefrom press Alternative Refrigerant Compressors middle pressure air themperature to be out increased to 190.5 ℃, then in water/air heat exchanger B with the recirculated water heat exchange of 30.0 ℃, 4.5 tons of flowing out from heat exchanger A/time, after discharging 345.5kW heat, temperature is reduced to 45.0 ℃, and then enter in heat exchanger F with 15.9 ℃, 5.0 tons that from water/air heat exchanger C, flow out/time recirculated water heat exchange, heat exchange amount is 47.4kW, and temperature is further reduced to 25.0 ℃; Middle pressure air after cooling enters high-pressure working medium compressor boost becomes pressure-air to 3.84MPa, the about 452.0kW of high-pressure working medium compressor wasted work; The temperature of pressure-air is about 208.1 ℃, its successively in water/air heat exchanger D with 23.5 ℃, 5.0 tons of flowing out from heat exchanger E/time recirculated water, and through water/air heat exchanger C with 10.0 ℃, 5.0 tons that from heat exchanger D, flow out/time recirculated water carry out heat exchange, in water/air heat exchanger D, discharge 422.5kW heat, temperature is reduced to 35.0 ℃, and in water/air heat exchanger C, discharges 37.3kW heat and be further cooled to 20.0 ℃; Then this pressure-air being cooled is transported to the junked tire low-temperature grinding plant area outside 1kM by hot insulated line, through working medium decompressor, be expanded to 0.15MPa, air themperature is reduced to-125.9 ℃, can export 302.7kW mechanical power for driving low pressure working fluid compressor, form working medium kind of refrigeration cycle simultaneously.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.
From 6500 standard cubic meters/time ,-125.9 ℃ of Cryogenic air of the output of working medium decompressor, send into junked tire low-temperature crushing device, can be the precooling of junked tire, freezing and low-temperature grinding etc. 295.7kW cold energy be provided altogether, be equivalent to 2.56 tons/time the liquid nitrogen cold that provides.According to 1 ton of fine glue powder of current conventional method production, need consume 1 ton of liquid nitrogen converts, the pressure energy refrigeration that reclaims 2.0 ten thousand standard cubic meters/time, 4.0MPa high-pressure natural gas by air as refrigeration working medium at natural gas pressure regulating station can meet produce 2.56 tons/time fine glue powder cold energy demand, according to annual operation, within 8000 hours, calculate, can produce every year 2.05 ten thousand tons of fine glue powders, can process approximately 165～1,850,000 junked tires of junked tire, environmental protection and resource circulation utilization benefit are obvious.With respect to adopting liquid nitrogen frozen comminuting method, can save every year 2.05 ten thousand tons of liquid nitrogen, approximately 1,230 ten thousand yuan/year of energy-conservation value.And than adopting air turbine swell refrigeration, can save the about 780kW of Alternative Refrigerant Compressors power consumption, can save every year electric energy approximately 6,240,000 kWh, approximately 499.2 ten thousand yuan of energy-conservation value.
Embodiment tetra-
For a high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding, its technological process as shown in Figure 4, adopts a decompressor, and refrigeration working medium is air.
The gas pressure that is 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 ℃, 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 ℃, and water dew point during 0.5MPa is-15.0 ℃.In natural gas pressure regulating station, the high-pressure natural gas of 1.6MPa need to be depressurized to enter after 0.5MPa presses gas distributing system (middle pressure pipe net) in city, average treatment amount is 4.0 ten thousand standard cubic meters/time, the minimum treating capacity at night is 2.3 ten thousand standard cubic meters/time, now utilize the pressure energy of the wherein high-pressure natural gas pressure regulation release in 2.0 ten thousand standard cubic meters/time for the production of-100 ℃ of following cryogenic cold energy, 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 is selected air, and circular flow is 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:
By upstream trunk high pressure pipe network, be transported to the 1.6MPa high-pressure natural gas at natural gas pressure regulating station, its flow is 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, and flow is 2.0 ten thousand standard cubic meters/time, and 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 strand is refrigeration natural gas flow, and flow is 2.0 ten thousand standard cubic meters/time, and it enters pressure energy use device after flow valve B, for junked tire low-temperature crushing device provides required cold energy; Because can causing the natural gas processing amount at natural gas pressure regulating station, downstream natural gas consumption fluctuation in 2.3～5.0 ten thousand standard cubic meters/time, fluctuates round the clock, by adjust flux valve A and flow valve B, the flow of natural gas flow of making to freeze remains unchanged, and pressure regulation natural gas flow changed in 0.3～3.0 ten thousand standard cubic meters/time, when 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/time of flow valve B be introduced in heat exchanger A with 2.6 tons that from water/air heat exchanger A, flow out/time, 58.8 ℃ of recirculated water heat exchange, from recirculated water absorbs 94.5kW heat, the temperature of refrigeration natural gas flow is increased to 24.9 ℃ from 15.0 ℃, 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 flowing out from heat exchanger A enter in heat exchanger B with 2.6 tons that from water/air heat exchanger B, flow out/time, the recirculated water heat exchange of 90.6 ℃, the temperature that absorbs the natural gas flow that freezes after 166.1kW heat is increased to 42.4 ℃ from 24.9 ℃, because have 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 2.8 tons that from water/air heat exchanger C, flow out/time, 93.7 ℃ of recirculated waters carry out heat exchange, refrigeration natural gas flow absorbs after 137.0kW heat, temperature is further increased to 56.6 ℃, overcome after the pressure drop 0.02MPa of heat transfer process, refrigeration natural gas flow enters in natural gas high pressure decompressor and expands and be depressurized to 0.54MPa, the merit of natural gas high pressure decompressor output is 466.8kW, for driving, press Alternative Refrigerant Compressors and high-pressure working medium compressor, load is 233.4kW; And refrigeration natural gas flow temperature after expanding is reduced to-1.4 ℃, higher than water dew point temperature-14.1 ℃ of natural gas now, without free water, separate out; This refrigeration natural gas flow is again through heat exchange C and 2.6 tons of flowing out from heat exchanger B/time, the recirculated water heat exchange of 40.0 ℃, absorb 81.7kW heat after temperature be increased to 7.7 ℃; 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 2.8 tons that from heat exchanger D, flow out/time, 55.0 ℃ of recirculated water heat exchange, after the heat of absorption 105.6kW, temperature is increased to 19.2 ℃, overcome the pressure drop 0.02MPa in heat exchanger E, the pressure decreased of refrigeration natural gas flow is pressed gas distributing system (middle pressure pipe net) to entering after 0.50MPa in city simultaneously.
(3) for the working medium kind of refrigeration cycle of junked tire low-temperature grinding
In 3500 standard cubic meters/time ,-115.5 ℃, the Cryogenic air of 0.15MPa, discharge 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 10.0 ℃, 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 ℃, becomes low-pressure air; Low-pressure air in junked tire low-temperature grinding plant area is transported to the natural gas pressure regulating station about 1kM, overcomes the about 0.03MPa of flow resistance by hot insulated line; Low-pressure air first in water/air heat exchanger A with 15.0 ℃, 2.6 tons that from heat exchanger C, flow out/time recirculated water heat exchange, discharge 143.5kW heat after temperature be reduced to 25.0 ℃, and then through in press Alternative Refrigerant Compressors to be pressurized to 1.00MPa to become middle pressure air; The about 233.4kW of middle pressure Alternative Refrigerant Compressors wasted work, therefrom press Alternative Refrigerant Compressors middle pressure air themperature to be out increased to 200.3 ℃, then in water/air heat exchanger B with the recirculated water heat exchange of 30.0 ℃, 2.6 tons of flowing out from heat exchanger A/time, after discharging 198.7W heat, temperature is reduced to 45.0 ℃, and then enter high-pressure working medium compressor boost and to 3.60MPa, become pressure-air, the about 233.4kW of high-pressure working medium compressor wasted work; The temperature of pressure-air is about 220.0 ℃, then enter in water/air heat exchanger C with 25.0 ℃, 2.8 tons that from heat exchanger E, flow out/time loop heat exchange, discharge 242.5kW heat after pressure-air temperature be reduced to 35.0 ℃; Then this pressure-air being cooled is transported to the junked tire low-temperature grinding plant area outside 1kM by hot insulated line, through working medium decompressor, be expanded to 0.15MPa, air themperature is reduced to-115.5 ℃, can export 170.3kW mechanical power for driving low pressure working fluid compressor, form working medium kind of refrigeration cycle simultaneously.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.
From 3500 standard cubic meters/time ,-115.5 ℃ of Cryogenic air of the output of working medium decompressor, send into junked tire low-temperature crushing device, can be the precooling of junked tire, freezing and low-temperature grinding etc. 158.6kW cold energy be provided altogether, be equivalent to 1.37 tons/time the liquid nitrogen cold that provides.According to 1 ton of fine glue powder of current conventional method production, need consume 1 ton of liquid nitrogen converts, the pressure energy refrigeration that reclaims 2.0 ten thousand standard cubic meters/time, 1.6MPa high-pressure natural gas by air as refrigeration working medium at natural gas pressure regulating station can meet produce 1.37 tons/time fine glue powder cold energy demand, according to annual operation, within 8000 hours, calculate, can produce every year 1.10 ten thousand tons of fine glue powders, can process approximately 90～1,000,000 junked tires of junked tire, environmental protection and resource circulation utilization benefit are obvious.With respect to adopting liquid nitrogen frozen comminuting method, can save every year 1.10 ten thousand tons of liquid nitrogen, approximately 6,600,000 yuan/year of energy-conservation value.And than adopting air turbine swell refrigeration, can save the about 419kW of Alternative Refrigerant Compressors power consumption, can save every year electric energy approximately 335.2 ten thousand kWh, approximately 268.2 ten thousand yuan of energy-conservation value.。
Above-described embodiment is preferably embodiment of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.

Claims (10)

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 to be converted to mechanical power and cold energy in natural gas pressure regulating station; Then the mechanical power and the cold energy that utilize refrigeration working medium to expand and produce for communication medium recycling high-pressure natural gas, on the one hand mechanical power being used for to compression refrigeration working medium becomes high-pressure refrigeration working medium, on the other hand by optimal design heat-exchange network, the cold energy that utilizes high-pressure natural gas expansion to produce carrys out the high-pressure refrigeration working medium after cooled compressed, and can improve the intake air temperature of the high-pressure natural gas that enters decompressor, increase the mechanical power that high-pressure natural gas expands and produces; Then utilize hot insulated line, cooling high-pressure refrigeration working medium is transported to the junked tire low-temperature grinding plant area outside natural gas pressure regulating station, then high-pressure refrigeration working medium is expanded and is produced required-100 ℃ of following cryogenic cold energy of junked tire low-temperature grinding process by working medium decompressor, 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.
2. according to a kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding claimed in claim 1, it is characterized in that comprising the following steps:
A. high-pressure natural gas flow control:
By upstream high pressure pipe network, be transported to the high-pressure natural gas at natural gas pressure regulating station, its pressure is 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 middle pressure pipe net; Another strand is refrigeration natural gas flow, and it enters pressure energy use device after flow valve B, for junked tire low-temperature crushing device provides required cold energy; When downstream natural gas consumption fluctuation or junked tire low-temperature crushing device chilling requirement occur changes, by adjust flux valve A and flow valve B, can meet the cold energy demand with gas demand and junked tire low-temperature crushing device of downstream user 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 from low pressure working fluid compressor, flow out and be transported to by hot insulated line the low pressure refrigeration working medium heat exchange at natural gas pressure regulating station, by heat exchanger B and the middle pressure refrigeration working medium heat exchange of therefrom pressing Alternative Refrigerant Compressors to flow out, after acquisition heat, temperature is increased to 50～100 ℃ again; Then refrigeration natural gas flow enters in natural gas high pressure decompressor and expands and carry out step-down, the mechanical power of natural gas high pressure decompressor output is pressed Alternative Refrigerant Compressors for driving, the natural gas temperature simultaneously flowing out from natural gas high pressure decompressor reduces, by regulating the outlet pressure of natural gas high pressure decompressor to make its temperature higher than the water dew point of natural gas; When the gas pressure flowing out from natural gas high pressure decompressor still higher than during the transmission & distribution pressure of pressure pipe net, this refrigeration natural gas flow is again through heat exchanger C and the low pressure 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, absorb after heat, the temperature of refrigeration natural gas flow is increased to 20～60 ℃; Then the natural gas flow that freezes enters in natural gas medium-pressure decompressor and expands and be depressurized to 0.4～0.6MPa, the mechanical power of natural gas medium-pressure decompressor output is used for driving high-pressure working medium compressor, the refrigeration natural gas flow temperature simultaneously flowing out from natural gas medium-pressure decompressor reduces, but its temperature is still higher than the water dew point of natural gas; After this, refrigeration natural gas flow successively in heat exchanger E with the high-pressure refrigeration working medium heat exchange of flowing out from heat exchanger D, in heat exchanger F with from heat exchanger B, flow out the heat exchange of pressure refrigeration working medium, the temperature of refrigeration natural gas flow is increased to 10 ℃ and enters middle pressure pipe net after above;
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 approaches 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 ℃, becomes low pressure refrigeration working medium, low pressure refrigeration working medium is transported in contiguous natural gas pressure regulating station from junked tire low-temperature grinding plant area by hot insulated line, low pressure refrigeration working medium first in heat exchanger A with the refrigeration natural gas flow heat exchange of flowing out from flow valve B, temperature is reduced to higher 10～25 ℃ than the refrigeration natural gas flow flowing out from flow valve B, then through heat exchanger C and the refrigeration natural gas flow heat exchange of flowing out from natural gas high pressure decompressor, low pressure refrigeration working medium temperature is further reduced to 10～30 ℃, 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 Alternative Refrigerant Compressors middle pressure refrigeration working medium out in heat exchanger B with the refrigeration natural gas flow heat exchange of flowing out from heat exchanger A, temperature is reduced to 30～60 ℃, then in heat exchanger F with the middle pressure natural gas flow heat exchange of flowing out from heat exchanger E, temperature is further reduced to 10～40 ℃, 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 is 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, flow out pressure natural gas flow carry out heat exchange, the temperature of high-pressure refrigeration working medium is reduced to 10～40 ℃, cooling high-pressure refrigeration working medium is transported to junked tire low-temperature grinding plant area by hot insulated line, then through working medium decompressor, be expanded to 0.15～0.20MPa, temperature is reduced to below-100 ℃, this cryogenic refrigeration working medium is sent into junked tire low-temperature crushing device, precooling, freezing and low-temperature grinding for junked tire, the mechanical power of the output of working medium decompressor expansion is simultaneously used 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 claimed in claim 1, it is characterized in that:
The scope of the high-pressure natural gas pressure that enters natural gas pressure regulating station in 1.6～10.0MPa;
The decompressor quantity of using is one or two;
When the high-pressure natural gas pressure that enters natural gas pressure regulating station is during at 2.0～10.0MPa, need to use two decompressors, comprise natural gas high pressure decompressor and natural gas medium-pressure decompressor, high-pressure natural gas passes through two-stage step-down successively, and pressure decreased is to the distribution pressure of middle pressure pipe net; 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 that enters natural gas pressure regulating station is during at 1.6～2.0MPa, only need to use a decompressor, this decompressor is natural gas high pressure decompressor, and high-pressure natural gas is through one-level step-down, and pressure decreased is to the distribution pressure of middle pressure pipe net; And by adjusting, flow through the flow of natural gas of decompressor and the outlet temperature that the flow of refrigeration working medium is controlled 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 claimed in 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 claimed in 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 claimed in claim 3, it is characterized in that: described refrigeration working medium is through low pressure working fluid compressor, middle pressure Alternative Refrigerant Compressors and three grades of compression superchargings of high-pressure working medium compressor;
The mechanical power that low pressure working fluid compressor is produced by working medium decompressor drives;
When using 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 using a 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 claimed in claim 1, it is characterized in that: the heat energy that described refrigeration working medium compression supercharging produces all be used for heating the natural gas by decompressor by heat exchanger, and high-pressure natural gas cooling after being all used for refrigeration working medium and compressing by heat exchanger of the cold energy that produces of expanding.
8. according to a kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding claimed in claim 1, it is characterized in that: described high-pressure natural gas is divided into two strands, in entering after flow valve A control enters conventional pressure regulator, pressure pipe net is for user again for one, and one is controlled and entered 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 claimed in 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, on the other hand can be by regulating the internal circulating load of refrigeration working medium to regulate; The flow that increases the flow of natural gas and reduce refrigeration working medium is to reduce cold energy temperature, and the flow that reduces the flow of natural gas and increase refrigeration working medium is with rising cold energy temperature.
10. according to a kind of high-pressure natural gas pressure energy refrigeration method for junked tire low-temperature grinding claimed in claim 1, it is characterized in that: the swell refrigeration of described high-pressure natural gas pressure energy and removal process are arranged on region, natural gas pressure regulating station, the cold energy use of the swell refrigeration of refrigeration working medium, junked tire low-temperature crushing device and utilized the preliminary pressurization of the refrigeration working medium after cold energy to be arranged on the junked tire low-temperature grinding plant area outside natural gas pressure regulating station, the transmission of energy, by the connection that transports of refrigeration working medium, is realized in these two regions.
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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
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

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Publication number Priority date Publication date Assignee Title
CN106369935A (en) * 2016-10-27 2017-02-01 西南石油大学 Air separation system and method utilizing pressure energy of high-pressure natural gas pipeline network
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
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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

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