CN101579651B - Method and device for crushing rubber by liquid phase of cold energy of liquefied natural gas - Google Patents
Method and device for crushing rubber by liquid phase of cold energy of liquefied natural gas Download PDFInfo
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- CN101579651B CN101579651B CN2009100402028A CN200910040202A CN101579651B CN 101579651 B CN101579651 B CN 101579651B CN 2009100402028 A CN2009100402028 A CN 2009100402028A CN 200910040202 A CN200910040202 A CN 200910040202A CN 101579651 B CN101579651 B CN 101579651B
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Abstract
The invention discloses a method and a device for crushing rubber by a liquid phase of cold energy of liquefied natural gas (LNG). The method comprises the following steps: taking the cold energy of the LNG as a cold source, and transmitting the cold energy to a solid-liquid mixture of coarse rubber powder and a powder assisting medium through a coolant heat exchanger to complete the precooling and deep cooling freezing processes of the rubber; crushing the frozen mixture by a liquid phase deep cooling crusher into certain granularity, entering a rubber precooling heat exchanger, raising the temperature to normal temperature, and separating fine rubber powder to prepare a product; and mixing separated normal temperature powder assisting medium and the coarse rubber powder to perform the next circulation. The method utilizes the cold energy of the LNG, does not need adopting a conventional compression expansion refrigeration process, and is a novel energy-saving rubber crushing process.In the production process, the process has no dust pollution, easily realizes the delivery and cold exchange between the rubber and the powder assisting medium, and has convenient operation and contr ol and high automation degree. The granularity of the rubber powder by the process is generally between 200 and 300 meshes, and the rubber powder is hyperfine rubber powder with excellent performance.
Description
Technical field
The invention belongs to cooling or Refrigeration Technique field, be specifically related to a kind of method and device thereof that utilizes cold energy of liquefied natural gas liquid phase crushing rubber.
Background technology
Along with the development of China's liquefied natural gas (LNG) industry, being applied to of LNG cold energy for one of energy-saving and cost-reducing strategic task of LNG industry.It under the LNG normal pressure-162 ℃ cryogenic liquid.The power consumption that LNG produces is about 850kWh/t, approximately can discharge the cold of 230～240kWh in receiving terminal 1.0t LNG vaporization.Therefore, with the cold energy of LNG be the rubber disintegrating process of low-temperature receiver become the LNG cold energy utilize one of mode.
Rubber is pulverized the method for producing rubber powder and is mainly contained normal temperature pulverizing, low-temperature grinding and wet method pulverizing etc.Fine glue powder adopts the low-temperature grinding method to make more.The operation principle of low-temperature grinding (having another name called freezing pulverizing) is that the junked tire material piece of chopping gets into the precooling case from hopper; Utilize liquid nitrogen or other refrigerant, temperature is freezed to-70～-100 ℃, broken blob of viscose is after embrittlement under this temperature; The entering dry pan is pulverized; It is freezing to carry out secondary, and then grinds, and just can form fine glue powder.But adopt its energy consumption of method production fine glue powder of liquid nitrogen spraying higher, there is dust pollution in production process, and automaticity is not high, has limited its application in industry.U.S. Pat 3818976 discloses the cold rubber powder manufacturing process of a kind of gas double round robin, this technology first circularly cooling, and second circulation obtains cold through heat exchange from first circulation, simultaneously with micelle precooling, freezing, pulverizing.This technology relatively and liquid nitrogen spraying technology have certain progress, but its energy consumption is still higher.CN1141418A has reported a kind of air circulating refrigerating process and device of producing fine glue powder, by the compressed air of air compressor output, and after tail gas and the rubber powder heat exchange that crushed, swell refrigeration.Cold air is pulverized after freezing the raw material micelle in closed system, obtains fine glue powder.Tail gas after the heat exchange carries out drying to the raw material micelle.Dry micelle with rise again after rubber powder can not clump together.This technology fully utilizes the heat in the air cycle refrigeration process, but because it adopts air cycle refrigeration, its energy consumption is higher; Simultaneously, there is certain dust pollution in this technology in the production process of rubber powder, and the automaticity of its technology is not high.CN1332190A discloses a kind of sweller and secondary soak for preparing the method for ultra-fine rubber powder and prepare ultra-fine rubber powder, through adjustment grinding technics parameter, can obtain fine glue powder ((60-200 order) and ultra-fine rubber powder (more than 200 orders).Its production process is following: solvent allotment bucket → once immersion → removal free solvent → secondary immersion → wet grinding → second removal free solvent → solvent recovery → rubber powder screening, drying → rubber powder check.This process using wet method crushing rubber, dust pollution is lower in crushing process, but its production efficiency is not high, in the rubber powder production process, has added different swellers and secondary soak simultaneously, and the character of rubber powder is exerted a certain influence.
Summary of the invention
The object of the invention is to overcome the shortcoming of prior art, and a kind of method and device thereof that utilizes cold energy of liquefied natural gas liquid phase crushing rubber is provided, and the inventive method is saved energy than prior art, as much as possible the part cold in the process is fully utilized.
The object of the invention realizes through following technical scheme:
The inventive method comprises 2 circulations: LNG cooling refrigerant circulates and helps powder matchmaker circulation.LNG cooling refrigerant cyclic process is following: normal pressure, (refrigerant is propane, butane or NH for-162 ℃ of LNG and refrigerant
3In one or more) change coldly, refrigerant is cooled to-120～-100, refrigerant is supplied with disintegrating apparatus required cold in crushing process, afterwards with through change for the first time cold ultra-fine rubber powder and the mixture secondary that helps the powder matchmaker change cold after, accomplish refrigerant and circulate; Help powder matchmaker process cycles process following: thick rubber powder helps the powder matchmaker with normal temperature, and (fluorine chlorine is held high, CO for propane, butane
2Or NH
3In the mixture of one or more compositions) be mixed into charging, the solid content of thick rubber powder is 1%～5% weight in the charging, incoming mixture and the ultra-fine rubber powder of pulverizing through colloid mill with help powder matchmaker's mixture to change cold for the first time; Precooling is to-60 ℃～-40 ℃, changes coldly for the second time with refrigerant again, is cooled to-100 ℃～-80 ℃; Get into colloid mill; After crushed, through separating workshop section, make ultra-fine thin rubber powder after ultra-fine rubber powder and the mixture that helps the powder matchmaker and the incoming mixture heat exchange; The separating obtained powder matchmaker that helps pumps into normal temperature refrigerant storage tank simultaneously, recycles.
A kind of method of utilizing cold energy of liquefied natural gas liquid phase crushing rubber,
(1) cold energy with LNG is a low-temperature receiver, with the heat exchange of normal temperature refrigerant, the temperature of normal temperature refrigerant is reduced to-120～-100 ℃, and the low temperature refrigerant gets into 11 storages of atmospheric low-temperature refrigerant storage tank; During disintegrating apparatus work, refrigerant gets in the chuck of disintegrating apparatus, and cold required in the crushing process is provided;
(2) thick rubber powder and normal temperature liquid phase help the powder matchmaker in blender 1, to be mixed into charging; Get into first low temperature, two phase double-tube heat exchangers 2, earlier with pulverize after ultra-fine rubber powder and the mixture that helps the powder matchmaker change coldly for the first time, temperature drops to-60 ℃～-40 ℃; Change cold with step (1) from one low temperature refrigerant secondary that disintegrating apparatus comes out again; Temperature drops to-100 ℃～-80 ℃, and the temperature of refrigerant gets into constant-pressure and high-temperature refrigerant storage tank 9 after rising to normal temperature, recycles; Thick rubber powder with help the powder matchmaker to get into reducing mechanism to be ground into ultra-fine rubber powder and the mixture that helps the powder matchmaker;
(3) ultra-fine rubber powder and the mixture that helps the powder matchmaker get into the charging heat exchange in double-tube heat exchanger 2 and the step (2) mutually of first low temperature two; Ultra-fine rubber powder with help powder matchmaker's mixture to rise to normal temperature; Get into normal pressure material storage tank 5; Separated at filter 6, help the powder matchmaker to get into normal pressure and help powder matchmaker storage tank 8 to recycle, sent to packing through drying machine 7 dry ultra-fine rubber powders.
The temperature of described LNG is-162 ℃, and said refrigerant is propane, butane or NH
3In one or more.
It is by propane, butane, high, the CO of fluorine chlorine that described normal temperature liquid phase helps the powder matchmaker
2Or NH
3In the mixture of one or more compositions, the content of thick rubber powder is 1%～5% weight in the described charging, granularity is 40～60 orders.
Described disintegrating apparatus is a colloid mill 4.
Realize described a kind of device that utilizes the method for cold energy of liquefied natural gas liquid phase crushing rubber, comprise the 2 cover circulatory systems: LNG cooling coolant circulating system with help the powder matchmaker circulatory system; LNG cooling coolant circulating system comprises second low temperature, two phase double-tube heat exchangers 3, heat exchanger 10, constant-pressure and high-temperature refrigerant storage tank 9, colloid mill 4, atmospheric low-temperature refrigerant storage tank 11, centrifugal pump (16,17); Through refrigerant insulation feed-line heat exchanger 10, atmospheric low-temperature refrigerant storage tank 11, centrifugal pump 17, colloid mill 4, second low temperature, two phase double-tube heat exchangers 3, constant-pressure and high-temperature refrigerant storage tank 9, centrifugal pump 16 are connected the formation closed circuit successively; Help the powder matchmaker circulatory system to comprise blender 1; Double-tube heat exchanger 3, colloid mill 4, normal pressure material storage tank 5, filter 6, normal pressure help fine coal storage tank 8 and three centrifugal pumps (13,14,15) to first low temperature, two phase double-tube heat exchangers 2 mutually with second low temperature two; Help fine coal storage tank 8 to be connected with centrifugal pump 14 blender 1, centrifugal pump 13, first low temperature, two phase double-tube heat exchangers 2, normal pressure material storage tank 5, pump 15, filter 6, normal pressure through the normal temperature feed-line, double-tube heat exchanger 3, colloid mill 4 connect into the formation closed circuit mutually with second low temperature two with first low temperature, two phase double-tube heat exchangers 2 through the insulation feed-line again.
Advantage and beneficial effect that the present invention has with respect to prior art:
(1) the inventive method adopts liquid-phase operation, does not have dust pollution, and automaticity is higher;
(2) the present invention is a low-temperature receiver owing to using the LNG cold energy, and the part cold in the process is fully utilized as much as possible, has practiced thrift the required energy of compression-expansion refrigeration.
Description of drawings
Fig. 1 is the thick rubber powder technological process of production of junked tire figure;
Fig. 2 is a LNG cold energy liquid phase refrigerant crushing rubber process chart;
1 is blender; 2 is first low temperature, two phase double-tube heat exchangers; 3 is second low temperature, two phase double-tube heat exchangers; 4 is colloid mill; 5 is normal pressure material storage tank; 6 is filter; 7 is drying machine; 8 help the fine coal storage tank for normal pressure; 9 is constant-pressure and high-temperature refrigerant storage tank; 10,12 is heat exchanger; 11 is atmospheric low-temperature refrigerant storage tank; 13,14,15,16,17 is centrifugal pump.
The specific embodiment
Further specify below in conjunction with embodiment and Fig. 1, Fig. 2.
Embodiment 1
Realize the described a kind of device that utilizes the method for cold energy of liquefied natural gas liquid phase crushing rubber of claim 1, comprise the 2 cover circulatory systems: LNG cooling coolant circulating system with help the powder matchmaker circulatory system; LNG cooling coolant circulating system comprises second low temperature, two phase double-tube heat exchangers 3, heat exchanger 10, constant-pressure and high-temperature refrigerant storage tank 9, colloid mill 4, atmospheric low-temperature refrigerant storage tank 11, centrifugal pump 16,17; Through refrigerant insulation feed-line heat exchanger 10, atmospheric low-temperature refrigerant storage tank 11, centrifugal pump 17, colloid mill 4, second low temperature, two phase double-tube heat exchangers 3, constant-pressure and high-temperature refrigerant storage tank 9, centrifugal pump 16 are connected the formation closed circuit successively; Help the powder matchmaker circulatory system to comprise blender 1; Double-tube heat exchanger 3, colloid mill 4, normal pressure material storage tank 5, filter 6, normal pressure help fine coal storage tank 8 and three centrifugal pumps 13,14,15 to first low temperature, two phase double-tube heat exchangers 2 mutually with second low temperature two; Help fine coal storage tank 8 to be connected with centrifugal pump 14 blender 1, centrifugal pump 13, first low temperature, two phase double-tube heat exchangers 2, normal pressure material storage tank 5, pump 15, filter 6, normal pressure through the normal temperature feed-line, double-tube heat exchanger 3, colloid mill 4 connect into the formation closed circuit mutually with second low temperature two with first low temperature, two phase double-tube heat exchangers 2 through the insulation feed-line again.
According to technological process shown in Figure 1, the thick rubber powder of 40～60 purposes that becomes with the junked tire coarse crushing is a raw material, and according to the LNG cold energy liquid phase refrigerant crushing rubber process chart of Fig. 2, with-162 ℃, the LNG of 1000kg is an example under the 6.2Mpa.The composition of LNG is seen table 1; Cold energy with LNG is a low-temperature receiver, with 2500Kg, and 25 ℃, the refrigerant normal butane heat exchange of 0.5Mpa, the temperature of refrigerant is reduced to-115 ℃, gets into 11 storages of atmospheric low-temperature refrigerant storage tank; When colloid mill 4 work, with centrifugal pump 17 refrigerant in the atmospheric low-temperature refrigerant storage tank 11 is forced into 0.4～0.6MPa, get in the chuck of colloid mill, cold required in the crushing process is provided; The refrigerant that goes out colloid mill is divided into two strands; One directly gets into constant-pressure and high-temperature refrigerant storage tank 9, another strand get in second low temperature, the two phase double-tube heat exchangers 3 with thick rubber powder with help powder matchmaker mixture to be cooled to-86 ℃, get into constant-pressure and high-temperature refrigerant storage tank 9 then;, pump 16 gets into heat exchanger 10 and LNG heat exchange after being forced into 0.4～0.6MPa; Temperature is reduced to about-110～-100 ℃, and the refrigerant after the cooling gets into atmospheric low-temperature refrigerant storage tank 11, recycles.The natural gas that LNG is vaporizated into about 2 ℃ is incorporated city natural gas pipe network into.
1940kg, 25 ℃, help the thick rubber powder of 40～60 purposes of powder matchmaker normal butane and 60kg in blender 1, to be mixed into charging under the normal pressure, be forced into 0.5Mpa through centrifugal pump 13; With pulverize at colloid mill 4 after-82 ℃, the ultra-fine rubber powder of 0.5Mpa and the mixture that helps powder matchmaker normal butane, heat exchange in first low temperature, two phase double-tube heat exchangers 2; Temperature is reduced to-60 ℃, again with provide for crushing process behind the cold refrigerant, heat exchange in second low temperature, two phase double-tube heat exchangers 3; Refrigerant temperature is increased to-94 ℃, and heater via is heated to normal temperature, gets in the normal pressure refrigerant storage tank 9 subsequent use; Charging is cooled to-86 ℃, gets into break section, and thick rubber powder is crushed to the ultra-fine rubber powder of 200～3000 purposes; This moment ultra-fine rubber powder with help the temperature of the mixture of powder matchmaker normal butane to rise to-82 ℃, this mixture get into first low temperature, two phase double-tube heat exchangers 2 with the charging heat exchange after, ultra-fine rubber powder with help powder matchmaker's mixture to rise to normal temperature; Get into normal pressure material storage tank 5, get into filter 6, separate ultra-fine rubber powder; Ultra-fine rubber powder helps the powder matchmaker to get into normal temperature and helps powder matchmaker storage tank 8 through processing product through drying machine 7 dryings, screening and packing, recycles.
After utilizing the inventive method through Fig. 2 technological process, obtain like table 2 result.Listed the data result of 27 embodiment in the table.The result shows that the present invention has effectively reclaimed the LNG cold energy, uses it for rubber and pulverizes, and has practiced thrift the required energy of compression-expansion refrigeration; Pulverize in technology at this waste old, the rubber of unit mass utilizes cold energy to be 521KJ/kg approximately, and the cold energy that wherein is used to cool off rubber is about 242KJ/kg.
Table 1
| Component | CH 4 | C 2H 6 | C 3H 8 | i?C 4H 10 | n?C 4H 10 | CO 2 | N 2 | Add up to |
| Form (mol%) | 89.39 | 5.76 | 3.30 | 0.78 | 0.66 | 0.0 | 0.11 | 100 |
Table 2
Claims (5)
1. a method of utilizing cold energy of liquefied natural gas liquid phase crushing rubber is characterized in that, may further comprise the steps:
(1) cold energy with LNG is a low-temperature receiver, with the heat exchange of normal temperature refrigerant, the temperature of normal temperature refrigerant is reduced to-120～-100 ℃, and the low temperature refrigerant gets into atmospheric low-temperature refrigerant storage tank (11) storage; During disintegrating apparatus work, refrigerant gets in the chuck of disintegrating apparatus, and cold required in the crushing process is provided;
(2) thick rubber powder and normal temperature liquid phase help the powder matchmaker in blender (1), to be mixed into charging; Get into first low temperature, two phase double-tube heat exchangers (2), earlier with pulverize after ultra-fine rubber powder and the mixture that helps the powder matchmaker change coldly for the first time, temperature drops to-60 ℃～-40 ℃; Change cold with step (1) from one low temperature refrigerant secondary that disintegrating apparatus comes out again; Temperature drops to-100 ℃～-80 ℃, and the temperature of refrigerant gets into constant-pressure and high-temperature refrigerant storage tank (9) after rising to normal temperature, recycles; Thick rubber powder with help the powder matchmaker to get into disintegrating apparatus to be ground into ultra-fine rubber powder and the mixture that helps the powder matchmaker;
(3) ultra-fine rubber powder and the mixture that helps the powder matchmaker get into the charging heat exchange in double-tube heat exchanger (2) and the step (2) mutually of first low temperature two; Ultra-fine rubber powder with help powder matchmaker's mixture to rise to normal temperature; Get into normal pressure material storage tank (5); Separated at filter (6), help the powder matchmaker to get into normal pressure and help powder matchmaker storage tank (8) to recycle, sent to packing through the ultra-fine rubber powder that drying machine (7) is dry.
2. method according to claim 1 is characterized in that, the temperature of described LNG is-162 ℃, and said refrigerant is propane, butane, NH
3In one or more.
3. method according to claim 1 is characterized in that, it is by propane, butane, high, the CO of fluorine chlorine that described normal temperature liquid phase helps the powder matchmaker
2, NH
3In the mixture of one or more compositions, the content of thick rubber powder is 1%～5% weight in the described charging, granularity is 40～60 orders.
4. method according to claim 1 is characterized in that, described disintegrating apparatus is colloid mill (4).
5. realize the described a kind of device that utilizes the method for cold energy of liquefied natural gas liquid phase crushing rubber of claim 1, it is characterized in that, comprise the 2 cover circulatory systems: LNG cooling coolant circulating system with help the powder matchmaker circulatory system; LNG cooling coolant circulating system comprises second low temperature, two phase double-tube heat exchangers (3), heat exchanger (10), constant-pressure and high-temperature refrigerant storage tank (9), colloid mill
(4), atmospheric low-temperature refrigerant storage tank (11), centrifugal pump (16,17); Through refrigerant insulation feed-line heat exchanger (10), atmospheric low-temperature refrigerant storage tank (11), centrifugal pump (17), colloid mill (4), second low temperature, two phase double-tube heat exchangers (3), constant-pressure and high-temperature refrigerant storage tank (9), centrifugal pump (16) are connected successively, constitute closed circuit; Help the powder matchmaker circulatory system to comprise blender (1); Double-tube heat exchanger (3), colloid mill (4), normal pressure material storage tank (5), filter (6), normal pressure help fine coal storage tank (8) and three centrifugal pumps (13,14,15) to first low temperature, two phase double-tube heat exchangers (2) mutually with second low temperature two; Help fine coal storage tank (8) to be connected with centrifugal pump (14) blender (1), centrifugal pump (13), first low temperature, two phase double-tube heat exchangers (2), normal pressure material storage tank (5), pump (15), filter (6), normal pressure through the normal temperature feed-line, double-tube heat exchanger (3), colloid mill (4) connect into closed circuit mutually with second low temperature two with first low temperature, two phase double-tube heat exchangers (2) through the insulation feed-line again.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100402028A CN101579651B (en) | 2009-06-12 | 2009-06-12 | Method and device for crushing rubber by liquid phase of cold energy of liquefied natural gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100402028A CN101579651B (en) | 2009-06-12 | 2009-06-12 | Method and device for crushing rubber by liquid phase of cold energy of liquefied natural gas |
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|---|---|
| CN101579651A CN101579651A (en) | 2009-11-18 |
| CN101579651B true CN101579651B (en) | 2012-05-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712061A (en) * | 2014-01-10 | 2014-04-09 | 辽宁石油化工大学 | Method and device for waste rubber crushing and peak shaving of natural gas liquefaction |
| CN103817821A (en) * | 2014-01-24 | 2014-05-28 | 辽宁石油化工大学 | Method and device for realizing cold energy utilization of liquefied natural gas satellite stations |
| CN108772982A (en) * | 2018-06-08 | 2018-11-09 | 国宏中晶（北京）科技发展有限公司 | A kind of waste tire fine glue powder preparation facilities that granularity is controllable and method |
| CN108917291A (en) * | 2018-07-06 | 2018-11-30 | 辽宁石油化工大学 | A kind of system and method for gas station exhaust gas waste cold cascade utilization |
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Application publication date: 20091118 Assignee: Guangzhou Baiduchuan Communication Technology Co., Ltd. Assignor: South China University of Technology Contract record no.: 2014440000229 Denomination of invention: Method and device for crushing rubber by liquid phase of cold energy of liquefied natural gas Granted publication date: 20120509 License type: Exclusive License Record date: 20140523 |
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