CN114410334A - System and method for cooling and forming liquid asphalt - Google Patents
System and method for cooling and forming liquid asphalt Download PDFInfo
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- CN114410334A CN114410334A CN202210037551.XA CN202210037551A CN114410334A CN 114410334 A CN114410334 A CN 114410334A CN 202210037551 A CN202210037551 A CN 202210037551A CN 114410334 A CN114410334 A CN 114410334A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 154
- 239000007788 liquid Substances 0.000 title claims abstract description 97
- 238000001816 cooling Methods 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 284
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 77
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 69
- 239000010959 steel Substances 0.000 claims abstract description 69
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 36
- 238000005507 spraying Methods 0.000 claims description 32
- 239000003245 coal Substances 0.000 claims description 18
- 239000007787 solid Substances 0.000 claims description 14
- 238000001556 precipitation Methods 0.000 claims description 9
- 238000007493 shaping process Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 5
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 2
- 239000011280 coal tar Substances 0.000 claims description 2
- 239000003208 petroleum Substances 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 abstract description 8
- 230000008020 evaporation Effects 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 230000002411 adverse Effects 0.000 abstract description 3
- 238000012546 transfer Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 7
- 239000000047 product Substances 0.000 description 6
- 239000003921 oil Substances 0.000 description 5
- 238000000465 moulding Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
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- 230000001376 precipitating effect Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000010742 number 1 fuel oil Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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- 229910052717 sulfur Inorganic materials 0.000 description 1
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- 230000001502 supplementing effect Effects 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
- C10C3/00—Working-up pitch, asphalt, bitumen
- C10C3/14—Solidifying, Disintegrating, e.g. granulating
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- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Road Paving Machines (AREA)
Abstract
The invention relates to the technical field of chemical industry, in particular to a system and a method for cooling and forming liquid asphalt. The system adopts the circulating water unit, so that circulating water after heat exchange is cooled by the circulating water pool and the ammonia cooler and does not enter a plant circulating water pipe network system, and adverse effects on other devices and equipment caused by circulating water quality fluctuation of the coal-liquefied asphalt forming device are avoided; the direct contact cooling of circulating water and liquid asphalt is cancelled, so that the pollution of the circulating water is avoided, and the quality of the asphalt product is ensured; through the indirect heat transfer of microthermal circulating water and liquid pitch, under the quick refrigerated prerequisite of guarantee liquid pitch, reduced the evaporation capacity of circulating water after being heated by high temperature pitch, the water economy resource prolongs steel band life.
Description
Technical Field
The invention relates to the technical field of chemical industry, in particular to a system and a method for cooling and forming liquid asphalt.
Background
The coal direct liquefaction asphalt is a main byproduct in the coal direct liquefaction process and accounts for about 40% of the processed coal amount. It is a high ash, high sulfur and high heat value substance, mainly composed of non-distillate oil, asphalt, unconverted coal and inorganic mineral matter. The non-distillate liquefied oil and asphalt account for about 52% of coal direct liquefied asphalt, mainly comprise polycyclic aromatic hydrocarbon, and have the characteristics of high aromaticity, high carbon content and easy polymerization or crosslinking.
In the direct coal liquefaction process, most of coal is hydrogenated in a direct coal liquefaction reactor to generate liquid oil with wider fraction distribution, a small amount of gas, water and the like, and other oil with heavier fraction and all solid materials, including a catalyst in raw material coal oil slurry, ash (inorganic mineral substances) in the coal, unreacted coal and the like, are subjected to solid-liquid separation through reduced pressure distillation. The heavier solvent components and oil with heavier distillation range are distilled out from the side line and the top of the vacuum tower, the heavier heavy oil and asphalt substances (mainly asphaltene and preasphaltene) and all solid substances are discharged from the bottom of the vacuum tower, are conveyed to an overflow groove through a pipeline, are uniformly spread through the overflow groove and enter an asphalt forming machine, are cooled in a contact and non-contact combined manner through cooling water provided by a circulating water pipe network and liquid asphalt, and are solidified and formed to be used as main byproducts of direct coal liquefaction.
The coal direct liquefaction asphalt is formed by combining the non-contact cooling of spraying circulating water on the back side of a steel belt of an asphalt forming machine and the cooling of directly spraying the circulating water on the surface of the asphalt. The temperature of the liquid asphalt from the bottom of the coal direct liquefaction decompression tower is high (about 320 ℃), and cooling water sprayed on the surface of the asphalt is vaporized and evaporated by the high-temperature liquid asphalt, so that the waste of water resources is caused; part of circulating water is in direct contact with the liquid asphalt to cause the pollution of cooling water by organic matters in the liquid asphalt, enters a circulating water pipe network system to cause adverse effects on other devices and equipment using the circulating water, simultaneously increases the sewage treatment capacity, and further causes the waste of energy and the reduction of economic benefits; the circulating water directly contacts the asphalt, so that the quality of the asphalt product is reduced; the cooling speed is slow, and the steel band at the feed opening is instantly contacted with liquid asphalt to deform at high temperature, so that the service life of the steel band is influenced.
Therefore, a new system and method for cooling and forming liquid asphalt is needed.
Disclosure of Invention
The invention aims to overcome the problems that the existing liquid asphalt adopts a cooling mode combining circulating water contact and non-contact liquid asphalt, the forming speed of the liquid asphalt is slow, the quality of the product asphalt is poor, the circulating water is easy to evaporate and generates sewage, a steel belt is easy to deform and has short service life and the like, and provides a novel system and a method for forming the liquid asphalt.
In order to achieve the above object, a first aspect of the present invention provides a system for cooling and forming liquid asphalt, the system comprising: the cooling forming unit comprises N asphalt forming machines connected in parallel, wherein N is a positive integer larger than or equal to 3; the circulating water unit includes: the spraying component, the water collecting tank, the circulating water tank and the ammonia cooler are sequentially communicated;
the asphalt forming machine comprises a steel belt, wherein the spraying assembly is arranged on the back side of the steel belt and is used for spraying circulating water to the back side of the steel belt and performing non-contact heat exchange with liquid asphalt on the steel belt to obtain solid asphalt converted from the liquid asphalt and circulating water converted from the circulating water after heat exchange;
the circulating water unit is used for collecting, settling, air-cooling and ammonia-cooling the heat-exchanged circulating water in sequence to obtain circulating backwater;
wherein the circulating return water is returned and mixed into the circulating water.
In a second aspect, the present invention provides a method for cooling and shaping liquefied asphalt, which is performed in the system provided in the first aspect, and which comprises the following steps:
(1) carrying out non-contact heat exchange on liquid asphalt and circulating water sprayed by a spraying component of the circulating water unit through a steel belt of the cooling forming unit to obtain solid asphalt converted from the liquid asphalt and circulating water converted from the circulating water after heat exchange;
(2) collecting the heat-exchanged circulating water in a water collecting tank of the circulating water unit to obtain collected circulating water;
(3) carrying out precipitation air cooling on the collected circulating water in a circulating water pool of the circulating water unit to obtain air-cooled circulating water;
(4) and performing ammonia cooling on the air-cooled circulating water in an ammonia cooler of the circulating water unit to obtain circulating return water, and returning and mixing the circulating return water into the circulating water.
According to the system for cooling and forming the liquefied asphalt, the circulating water unit is adopted, so that circulating water after heat exchange is cooled by the circulating water pool and the ammonia cooler and does not enter a plant circulating water pipe network system, and adverse effects on other devices and equipment due to circulating water quality fluctuation of the coal liquefied asphalt forming device are avoided; cooling the air-cooled circulating water through an ammonia cooler, spraying the circulating return water cooled to about 5-10 ℃ on the back side of a steel belt of an asphalt forming machine to indirectly cool the liquid asphalt, and canceling the direct contact cooling of the circulating water and the liquid asphalt to avoid the pollution of the circulating water and ensure the quality of the product asphalt at the same time; through the indirect heat transfer of microthermal circulating water and liquid pitch, under the quick refrigerated prerequisite of guarantee liquid pitch, reduced the evaporation capacity of circulating water after being heated by high temperature pitch, the water economy resource prolongs steel band life.
Drawings
FIG. 1 is a schematic view of a system for cooling and forming liquid asphalt provided by the present invention;
FIG. 2 is a schematic view of a system for cooling and forming liquid asphalt provided by a comparative example.
Description of the reference numerals
1. Liquid asphalt 2, overflow groove 3 and steel belt
4. Spraying assembly 5, solid asphalt 6 and water collecting tank
7. Circulating water 8 after heat exchange, circulating water pool 9 and air-cooled circulating water
10. Pump 11, ammonia cooler 12, liquid ammonia
13. 14 parts of gas ammonia, 15 parts of circulating backwater and supplementary circulating water
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a system for cooling and forming liquid asphalt, which comprises: the cooling forming unit comprises N asphalt forming machines connected in parallel, wherein N is a positive integer larger than or equal to 3; the circulating water unit includes: the spraying component, the water collecting tank, the circulating water tank and the ammonia cooler are sequentially communicated;
the asphalt forming machine comprises a steel belt, wherein the spraying assembly is arranged on the back side of the steel belt and is used for spraying circulating water to the back side of the steel belt and performing non-contact heat exchange with liquid asphalt on the steel belt to obtain solid asphalt converted from the liquid asphalt and circulating water converted from the circulating water after heat exchange;
the circulating water unit is used for collecting, settling, air-cooling and ammonia-cooling the heat-exchanged circulating water in sequence to obtain circulating backwater;
wherein the circulating backwater is returned and mixed into the circulating water.
The inventor of the invention researches and finds that: the existing cooling technology of combining circulating water contact and non-contact liquid asphalt is poor in cooling effect and not beneficial to rapid forming of high-load conveyed liquid asphalt; the quality of the product asphalt is also affected by the circulating water contacting the liquid asphalt; the circulating water is polluted when contacting the liquid asphalt, and the water quality of a circulating water pipe network is influenced; the circulating water is contacted with the liquid asphalt to be vaporized and evaporated, so that water resource waste is caused; the liquid asphalt can not be cooled rapidly, so that the steel strip is easy to deform, and the service life of the steel strip is influenced. Therefore, the invention cancels the mode of direct contact cooling of the circulating water and the liquid asphalt, adopts the mode of indirect contact cooling of the circulating water and the liquid asphalt, and combines the circulating water pool and the ammonia cooler in the circulating water unit to obviously reduce the temperature of the circulating water after heat exchange, promote the rapid molding of the liquid asphalt, avoid the problem of high-temperature deformation of a steel belt, ensure the normal cooling effect of the liquid asphalt, improve the quality of the product asphalt and reduce the efficiency of water resources.
In the present invention, the number of the asphalt forming machines depends on the treatment amount of the liquid asphalt, specific process parameter conditions and the like. In the present invention, N asphalt molding machines connected in parallel means that the liquid asphalt throughput of each asphalt molding machine is the same without any special description.
In some embodiments of the invention, preferably, N is 5 to 20, preferably 10 to 15.
In some embodiments of the present invention, it is preferable that the asphalt molding machine further includes an overflow bath provided at a front section of the steel strip, for uniformly flowing the liquid asphalt onto the surface of the steel strip.
In some embodiments of the invention, it is preferred that the vertical distance of the spraying system to the steel strip is less than or equal to 25cm, preferably 15-25 cm. Set up like this, guaranteeing that the circulating water fully sprays at the steel band back, if the distance is less than 15cm and be not convenient for change the shower nozzle or inspect the shower nozzle and block up the condition.
In some embodiments of the invention, the speed of the steel strip is preferably in the range of 15 to 35m/min, for example 15m/min, 20m/min, 25m/min, 30m/min, 35m/min, and any value in the range of any two values, preferably 15 to 25 m/min. In the invention, the speed of the steel belt is limited, so that the liquid asphalt and the circulating water are subjected to non-contact heat exchange fully.
In some embodiments of the present invention, preferably, the temperature of the liquid asphalt is 250-350 ℃, preferably 300-350 ℃; the pressure is 0.5-1.5MPa, preferably 1-1.5 MPa.
In the present invention, the pressure parameter refers to a gauge pressure parameter unless otherwise specified.
In the present invention, there is a wide range of selection of the kind of the liquid asphalt as long as the physical property parameters of the liquid asphalt satisfy the above-mentioned limitations. Preferably, the liquid asphalt is selected from at least one of coal direct liquefied asphalt, coal indirect liquefied asphalt, coal tar asphalt and petroleum asphalt.
In the present invention, the temperature parameter of the circulating water means the supply temperature of the circulating water without specific description.
In some embodiments of the invention, the temperature of the circulating water and the circulating backwater is preferably less than or equal to 10 ℃ and preferably 5-10 ℃ independently
In some embodiments of the present invention, preferably, the water collecting tank is used for collecting the heat-exchanged circulating water to obtain collected circulating water.
In some embodiments of the present invention, preferably, the circulating water tank is used for subjecting the collected circulating water to the precipitation air-cooling to obtain air-cooled circulating water.
In some embodiments of the present invention, preferably, the ammonia cooler is configured to perform ammonia cooling on the air-cooled circulating water to obtain the circulating return water.
In some embodiments of the present invention, preferably, the circulating water unit further comprises: and the pump is connected with the circulating water tank and the ammonia cooler.
According to the invention, the liquid level of the circulating water pool is preferably controlled to be 3 +/-0.2 m. And when the liquid level of the circulating water pool does not meet 3 +/-0.2 m, supplementing circulating water to ensure that the liquid level of the circulating water pool is 3 +/-0.2 m.
In a preferred embodiment of the present invention, there is provided a system for cooling and forming liquid asphalt as shown in fig. 1, the system comprising: cooling shaping unit and circulating water unit, cooling shaping unit include N parallelly connected pitch make-up machine (N is greater than or equal to 3 positive integer), and the circulating water unit includes: the spraying component 4, the water collecting tank 6, the circulating water tank 8, the pump 9 and the ammonia cooler 11 are communicated in sequence; the asphalt forming machine comprises a steel belt 3 and an overflow groove 2, wherein the overflow groove 2 is used for enabling liquid asphalt 1 to uniformly flow into the surface of the steel belt 3; the spraying assembly 4 is arranged on the back side of the steel belt 3 and is used for spraying circulating water to the back side of the steel belt 3 to perform non-contact heat exchange with the liquid asphalt 1 on the steel belt 3 to obtain solid asphalt 5 converted from the liquid asphalt 1 and circulating water 7 converted from the circulating water after heat exchange;
the water collecting tank 6 is used for collecting the heat-exchanged circulating water 7 to obtain collected circulating water; the circulating water tank 8 is used for carrying out precipitation air cooling on the collected circulating water to obtain air-cooled circulating water 9; and the ammonia cooler is used for cooling the air-cooled circulating water 9 with ammonia to obtain circulating return water 14.
According to a particularly preferred embodiment of the invention, the system comprises: the cooling forming unit comprises N asphalt forming machines connected in parallel, wherein N is a positive integer of 10-15; the circulating water unit includes: the spraying component, the water collecting tank, the circulating water tank and the ammonia cooler are sequentially communicated;
the asphalt forming machine comprises a steel belt, wherein the spraying assembly is arranged on the back side of the steel belt and is used for spraying circulating water to the back side of the steel belt and performing non-contact heat exchange with liquid asphalt on the steel belt to obtain solid asphalt converted from the liquid asphalt and circulating water converted from the circulating water after heat exchange; the vertical distance from the spraying system to the steel strip is 15-25 cm; the speed of the steel belt is 15-35 m/min;
the asphalt forming machine also comprises an overflow groove arranged at the front section of the steel strip and used for enabling the liquid asphalt to uniformly flow into the surface of the steel strip;
the water collecting tank is used for collecting the heat-exchanged circulating water to obtain collected circulating water;
the circulating water pool is used for carrying out the precipitation air cooling on the collected circulating water to obtain air-cooled circulating water;
the ammonia cooler is used for cooling the air-cooled circulating water with ammonia to obtain circulating return water;
and returning the circulating return water and mixing the circulating return water into the circulating water, wherein the temperatures of the circulating water and the circulating return water are respectively and independently 5-10 ℃.
In a second aspect, the present invention provides a method for cooling and shaping liquefied asphalt, which is performed in the system provided in the first aspect, and which comprises the following steps:
(1) carrying out non-contact heat exchange on liquid asphalt and circulating water sprayed by a spraying component of the circulating water unit through a steel belt of the cooling forming unit to obtain solid asphalt converted from the liquid asphalt and circulating water converted from the circulating water after heat exchange;
(2) collecting the heat-exchanged circulating water in a water collecting tank of the circulating water unit to obtain collected circulating water;
(3) carrying out precipitation air cooling on the collected circulating water in a circulating water pool of the circulating water unit to obtain air-cooled circulating water;
(4) and performing ammonia cooling on the air-cooled circulating water in an ammonia cooler of the circulating water unit to obtain circulating return water, and returning and mixing the circulating return water into the circulating water.
In some embodiments of the present invention, preferably, in step (1), the temperature of the circulating water after heat exchange is 20 to 25 ℃, preferably 20 to 22 ℃.
In some embodiments of the invention, it is preferred to control the speed of the steel strip to be in the range of 15-35m/min, e.g. 15m/min, 20m/min, 25m/min, 30m/min, 35m/min, and any value in the range of any two values, preferably 15-25m/min, such that the circulating water and liquid bitumen undergo the non-contact heat exchange.
In some embodiments of the present invention, it is preferable that the temperature of the circulating water after air cooling in step (3) is 20 ℃ or less, preferably 15 to 20 ℃.
In some embodiments of the invention, the temperature of the circulating water and the circulating return water is preferably each independently ≦ 10 ℃, preferably 5-10 ℃.
In some embodiments of the present invention, preferably, in step (4), the ammonia cooling process includes: and carrying out ammonia cooling on the air-cooled circulating water and liquid ammonia to obtain the circulating water and gas ammonia.
In some embodiments of the present invention, it is preferable that in step (4), the ratio of the amount of the circulating water and the liquid ammonia after air cooling is 1:0.01 to 0.1, e.g., 1:0.01, 1:0.05, 1:0.06, 1:0.08, 1:0.1, and any value in the range of any two values, preferably 1: 0.06-0.1.
The present invention will be described in detail below by way of examples.
The evaporation capacity Q of the circulating water is k (Tw2-Tw1) L, wherein Q is the loss of steam and is unit t/h; k is the temperature at which the coefficient of evaporation depends on Tw2, as specified in Table 1; tw1 is the temperature of the circulating return water (i.e., the supply water temperature of the circulating water), ° c; tw2 is the temperature of circulating water after heat exchange, DEG C; l is the flow rate of circulating water, and the unit t/h.
TABLE 1
| Temperature of Tw2, deg.C | -10 | 0 | 10 | 20 | 30 | 40 |
| k，℃-1 | 0.0008 | 0.001 | 0.0012 | 0.0014 | 0.0015 | 0.0016 |
Example 1
System for liquid asphalt cooling formingAs shown in fig. 1, as can be seen from fig. 1, the system includes: cooling shaping unit and circulating water unit, the cooling shaping unit includes 14 parallelly connected pitch make-up machines, and the circulating water unit includes: the spraying component 4, the water collecting tank 6, the circulating water tank 8, the pump 9 and the ammonia cooler 11 are communicated in sequence; the asphalt forming machine comprises a steel belt 3 and an overflow groove 2, wherein the overflow groove 2 is used for enabling liquid asphalt 1 to uniformly flow into the surface of the steel belt 3; the spraying assembly 4 is arranged on the back side of the steel belt 3 and is used for spraying circulating water to the back side of the steel belt 3 to perform non-contact heat exchange with the liquid asphalt 1 on the steel belt 3 to obtain heat-exchanged circulating water 7 converted from the circulating water and solid asphalt 5 converted from the liquid asphalt 1;
the water collecting tank 6 is used for collecting the heat-exchanged circulating water 7 to obtain collected circulating water; the circulating water tank 8 is used for carrying out precipitation air cooling on the collected circulating water to obtain air-cooled circulating water 9; the ammonia cooler is used for cooling the air-cooled circulating water 9 with ammonia to obtain circulating return water 14;
wherein the circulating return water is returned and mixed into the circulating water;
wherein the distance from the spraying system to the steel strip is 20cm, and the speed of the steel strip is 20 m/min.
Method for cooling and forming liquid asphaltThe method comprises the following steps:
(1) carrying out non-contact heat exchange on circulating water (the flow is 2000t/h, the temperature is 10 ℃) and liquid asphalt (the temperature is 320 ℃ and the pressure is 1.2MPa) to obtain solid asphalt converted from the liquid asphalt and circulating water (the temperature is 20 ℃) converted from the circulating water after heat exchange;
(2) collecting the circulating water subjected to heat exchange in a water collecting tank of the circulating water unit to obtain collected circulating water;
(3) precipitating and air-cooling the collected circulating water in a circulating water pool of a circulating water unit to obtain air-cooled circulating water (the temperature is 18 ℃);
(4) and (3) cooling the air-cooled circulating water in an ammonia cooler of the circulating water unit to obtain circulating return water (with the temperature of 10 ℃) which is returned and mixed into the circulating water.
Through calculation, the evaporation capacity Q1 of the circulating water is k (Tw1-Tw2), L is 0.0014 × (20-10) × 2000 is 28 t/h.
Comparative example 1
System for liquid asphalt cooling formingAs shown in fig. 2, as can be seen from fig. 2, the system includes: 14 asphalt forming machines connected in series, wherein each asphalt forming machine comprises a steel belt 3 and an overflow groove 2, and the overflow groove 2 is used for enabling liquid asphalt 1 to uniformly flow into the surface of the steel belt 3; the spraying assemblies 4 are arranged on the surface and the back side of the steel strip 3 and are respectively used for spraying circulating water to the surface and the back side of the steel strip 3 to exchange heat with the liquid asphalt 1 on the steel strip 3 to obtain circulating water 7 after heat exchange converted from the circulating water and solid asphalt 5 converted from the liquid asphalt 1;
the water collecting tank 6 is used for collecting the heat-exchanged circulating water 7 to obtain collected circulating water; the circulating water tank 8 is used for carrying out precipitation air cooling on the collected circulating water to obtain air-cooled circulating water 9, and returning and mixing the air-cooled circulating water into the circulating water;
wherein the distance from the spraying system to the steel strip is 20cm, and the speed of the steel strip is 20 m/min.
Method for cooling and forming liquid asphaltThe method comprises the following steps:
(1) carrying out heat exchange on circulating water (the flow is 2000t/h, the temperature is 10 ℃) and liquid asphalt (the temperature is 320 ℃ and the pressure is 1.2MPa) to obtain heat-exchanged circulating water (the temperature is 40 ℃) converted from the circulating water and solid asphalt converted from the liquid asphalt;
(2) collecting the circulating water subjected to heat exchange in a water collecting tank of the circulating water unit to obtain collected circulating water;
(3) and precipitating and air-cooling the collected circulating water in a circulating water pool of a circulating water unit to obtain air-cooled circulating water (with the temperature of 30 ℃) which returns and is mixed into the circulating water.
Through calculation, the evaporation capacity Q1 ═ k (Tw1-Tw2) L ═ 0.0016 × (40-30) × 2000 ═ 32t/h of the circulating water.
Compared with comparative example 1, example 1 saves the evaporation amount of circulating water by 4t/h from Q1' -Q1, and 35040t from annual consumption (i.e., Δ Q × 24 × 365); meanwhile, the direct contact type spray cooling of the circulating water and the liquid asphalt is adopted in the comparative example 1, the water consumption of each asphalt is 0.5t/h, that is, the water consumption of 14 asphalt forming machines is 7t/h, the direct contact type heat exchange is cancelled in the example 1, and the annual circulating water consumption is 61320t (namely, 7 multiplied by 24 multiplied by 365). Compared with comparative example 1, in example 1, the total annual circulating water consumption is 35040t +61320t 96360 t.
Therefore, compared with the existing cooling mode, the method provided by the invention cancels the direct contact cooling of the circulating water and the liquid asphalt, avoids the pollution of the circulating water and ensures the quality of the asphalt product; through the indirect heat exchange of low-temperature circulating water and liquid asphalt, the evaporation capacity of the circulating water heated by the high-temperature asphalt is reduced and the water resource is saved on the premise of ensuring the quick cooling of the liquid asphalt.
Test example
Cooling and forming the liquid asphalt by adopting the method of the comparative example 1 in 2015-2018; in 2019 and 2020, the method of example 1 is adopted to cool and shape the liquid asphalt, wherein the replacement amount of the steel strip in the past year is listed in Table 2.
TABLE 2
As can be seen from the data in table 2, the average number of replacement of the steel strip per year in comparative example 1 is 5, and the average number of replacement of the steel strip per year in example 1 is 2. Therefore, the method provided by the invention cancels the cooling mode of directly contacting the circulating water with the liquid asphalt, prolongs the service life of the steel strip and saves the cost.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. A system for cooling and forming liquid asphalt is characterized by comprising: the cooling forming unit comprises N asphalt forming machines connected in parallel, wherein N is a positive integer larger than or equal to 3; the circulating water unit includes: the spraying component, the water collecting tank, the circulating water tank and the ammonia cooler are sequentially communicated;
the asphalt forming machine comprises a steel belt, wherein the spraying assembly is arranged on the back side of the steel belt and is used for spraying circulating water to the back side of the steel belt and performing non-contact heat exchange with liquid asphalt on the steel belt to obtain solid asphalt converted from the liquid asphalt and circulating water converted from the circulating water after heat exchange;
the circulating water unit is used for collecting, settling, air-cooling and ammonia-cooling the heat-exchanged circulating water in sequence to obtain circulating backwater;
wherein the circulating return water is returned and mixed into the circulating water.
2. The system of claim 1, wherein N is 5-20, preferably 10-15;
and/or the asphalt forming machine further comprises an overflow groove arranged at the front section of the steel strip and used for enabling the liquid asphalt to uniformly flow into the surface of the steel strip.
3. The system according to claim 1 or 2, wherein the vertical distance of the spraying system to the steel strip is ≤ 25cm, preferably 15-25 cm.
4. A system according to any one of claims 1-3, wherein the speed of the steel strip is 15-35m/min, preferably 15-25 m/min.
5. System according to any of claims 1-4, wherein the temperature of the liquid bitumen is 250-350 ℃, preferably 300-350 ℃; the pressure is 0.5-1.5MPa, preferably 1-1.5 MPa;
and/or the liquid asphalt is selected from at least one of coal direct liquefaction asphalt, coal indirect liquefaction asphalt, coal tar asphalt and petroleum asphalt;
and/or the temperatures of the circulating water and the circulating backwater are respectively and independently less than or equal to 10 ℃, and are preferably 5-10 ℃.
6. The system according to any one of claims 1-5, wherein the water collection tank is configured to collect the heat-exchanged circulating water to obtain collected circulating water;
and/or the circulating water pool is used for carrying out precipitation air cooling on the collected circulating water to obtain air-cooled circulating water;
and/or the ammonia cooler is used for cooling the air-cooled circulating water with ammonia to obtain circulating return water;
and/or, the circulating water unit further comprises: and the pump is connected with the circulating water tank and the ammonia cooler.
7. A method for cooling and shaping liquid asphalt, wherein the method is carried out in the system of any one of claims 1 to 6, and the method comprises the following steps:
(1) carrying out non-contact heat exchange on liquid asphalt and circulating water sprayed by a spraying component of the circulating water unit through a steel belt of the cooling forming unit to obtain solid asphalt converted from the liquid asphalt and circulating water converted from the circulating water after heat exchange;
(2) collecting the heat-exchanged circulating water in a water collecting tank of the circulating water unit to obtain collected circulating water;
(3) carrying out precipitation air cooling on the collected circulating water in a circulating water pool of the circulating water unit to obtain air-cooled circulating water;
(4) and performing ammonia cooling on the air-cooled circulating water in an ammonia cooler of the circulating water unit to obtain circulating return water, and returning and mixing the circulating return water into the circulating water.
8. The method according to claim 7, wherein in the step (1), the temperature of the circulating water after heat exchange is 20-25 ℃, preferably 20-22 ℃;
and/or controlling the speed of the steel strip to be 15-35m/min, preferably 15-25m/min, so that the circulating water and the liquid asphalt are subjected to the non-contact heat exchange.
9. The method according to claim 7 or 8, wherein in the step (3), the temperature of the circulating water after air cooling is less than or equal to 20 ℃, preferably 15-20 ℃;
and/or the temperatures of the circulating water and the circulating backwater are respectively and independently less than or equal to 10 ℃, and are preferably 5-10 ℃.
10. The method according to any one of claims 7-9, wherein in step (4), the ammonia cooling comprises: cooling the air-cooled circulating water and liquid ammonia to obtain circulating water and gas ammonia;
and/or in the step (4), the using ratio of the circulating water to the liquid ammonia after air cooling is 1:0.01 to 0.1, preferably 1: 0.06-0.1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210037551.XA CN114410334A (en) | 2022-01-13 | 2022-01-13 | System and method for cooling and forming liquid asphalt |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210037551.XA CN114410334A (en) | 2022-01-13 | 2022-01-13 | System and method for cooling and forming liquid asphalt |
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| CN114410334A true CN114410334A (en) | 2022-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210037551.XA Pending CN114410334A (en) | 2022-01-13 | 2022-01-13 | System and method for cooling and forming liquid asphalt |
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|---|---|---|---|---|
| GB600685A (en) * | 1945-06-12 | 1948-04-15 | Noel Baville | A method and a plant for continuously cooling and solidifying by temperature lowering substances that are liquid hot and particularly pitch, bitumen, asphalt, resins and the like |
| GB778129A (en) * | 1957-12-27 | 1957-07-03 | Gulf Research Development Co | Method of cooling and granulating petroleum pitch |
| CN101463260A (en) * | 2007-12-20 | 2009-06-24 | 宝山钢铁股份有限公司 | Asphalt moulding method and system apparatus thereof |
| CN102876345A (en) * | 2012-10-30 | 2013-01-16 | 中国石油化工股份有限公司 | Hard asphalt granulation method and device thereof |
| CN109456784A (en) * | 2018-12-24 | 2019-03-12 | 北京紫瑞天成科技有限公司 | A kind of production unit that casting steel band type pitch is granulated |
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2022
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| GB600685A (en) * | 1945-06-12 | 1948-04-15 | Noel Baville | A method and a plant for continuously cooling and solidifying by temperature lowering substances that are liquid hot and particularly pitch, bitumen, asphalt, resins and the like |
| GB778129A (en) * | 1957-12-27 | 1957-07-03 | Gulf Research Development Co | Method of cooling and granulating petroleum pitch |
| CN101463260A (en) * | 2007-12-20 | 2009-06-24 | 宝山钢铁股份有限公司 | Asphalt moulding method and system apparatus thereof |
| CN102876345A (en) * | 2012-10-30 | 2013-01-16 | 中国石油化工股份有限公司 | Hard asphalt granulation method and device thereof |
| CN109456784A (en) * | 2018-12-24 | 2019-03-12 | 北京紫瑞天成科技有限公司 | A kind of production unit that casting steel band type pitch is granulated |
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