CN1265349A - Pre-cooling and twice wind cooling process for concrete aggregate - Google Patents
Pre-cooling and twice wind cooling process for concrete aggregate Download PDFInfo
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- CN1265349A CN1265349A CN 00114455 CN00114455A CN1265349A CN 1265349 A CN1265349 A CN 1265349A CN 00114455 CN00114455 CN 00114455 CN 00114455 A CN00114455 A CN 00114455A CN 1265349 A CN1265349 A CN 1265349A
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Abstract
The cooling process of the present invention includes the wind cooling in mixing building and features that before the wind cooling in bin of mixing buiding, the aggregate is passed through once wind cooling in aggregate pre-cooling bin and thatthe pre-cooling bin is provided with cold wind feeding distributor and cold wind fan, cooling equipment and other equipment for providing cool source outside the pre-cooling bin. The present invention is used for concrete pre-cooling of water conservancy and water power engineering and other engineering, and this can prevent concrete from producing crack caused by temperature stress.
Description
The present invention relates to Hydraulic and Hydro-Power Engineering and other engineering concrete construction technology, particularly a kind of pre-cooling and twice wind cooling process for concrete aggregate.
At present, the existing both at home and abroad pre-refrigeration technique of concrete has three kinds for the precooling measure that concrete machine outlet temperature is equal to or less than 10 ℃ the general employing of low temperature concrete: the one, and the water-cooled aggregate; The 2nd, batching plant feed bin air-cooling aggregate; The 3rd, add flake ice and mix and stir concrete.I.e. Chang Gui " three is cold " method pre-cool concrete technology.Wherein the water-cooled aggregate divides in the aggregate jar cold water spray aggregate method on the cold water soak aggregate method and sealing-tape machine again, and all there are problems such as cold consumption is big, complex process, floor space is big, construction investment is big in these two kinds of methods.Adopt the water-cooled aggregate also must build dedicated water treatment plant, there is problems such as dewatering totally, influence the concrete construction quality in cooled aggregate.
The object of the present invention is to provide that a kind of intermediate link is few, superior performance, be convenient to install, operation is simple, floor space is little, construction investment is economized, the reliable pre-cooling and twice wind cooling process for concrete aggregate of pre-cool concrete steady quality.
The object of the present invention is achieved like this: this technology be included in the batching plant feed bin to aggregate carry out air-cooled, unique distinction is: aggregate enter the batching plant feed bin carry out air-cooled before, in aggregate precooling storehouse, carried out first cooling by wind, be provided with cold wind delivery wind apparatus in this precooling storehouse, the storehouse is outside equipped with the air-cooler of preparation cold wind, and refrigeration system is equipped with the miscellaneous equipment that low-temperature receiver is provided.
Add flake ice later on again and mix and stir concrete finishing above-mentioned twice wind cooling.
The invention has the advantages that process procedure is few, energy consumption is low, and floor space is little, and construction investment is economized, and operating cost is low, and the pre-cool concrete steady quality is reliable.Wherein, an advantage is that floor space is little, can adjust mutually between the twice wind cooling, complements one another, and when certain link breaks down, can strengthen exerting oneself of another link in a short time, to guarantee the production of low temperature concrete.Moisture content reduced to 0% after another advantage was aggregate process twice wind cooling, aggregate surface is water content not, such side has reduced the freeze storehouse of aggregate in air-cooled process may, make aggregate can be chilled to subzero temperature, concrete strengthens amount on the rocks on the other hand, further reduce concrete machine outlet temperature, make the concrete construction quality reliable and stable.
The present invention compares with the concrete precooled aggregate technology of routine, and latter half is the same, all is air-cooling aggregate in the batching plant feed bin promptly, and then adds flake ice and mix and stir concrete, and different is first half, and one is to use air-cooling aggregate, and one is to use the water-cooled aggregate.The difference of its first cooling by wind and water-cooling process is:
1, the comparison of floor space:
The refrigeration workshop host machine part layout of first cooling by wind aggregate and water-cooled aggregate, version, floor space are all similar, and different is aggregate methods for cooling part.The water-cooled aggregate is divided into two kinds of technologies of trickle cooling aggregate on jar cold process and the belt usually again, and jar cold process now substantially need not owing to reasons such as facility complexity, operation operation complexity and restriction concrete output.Usually said water-cooled aggregate generally is meant spray cooling water cooling aggregate on belt at a slow speed, this just needs to increase the trickle gallery of insulation, belt feeder is incubated, in order to guarantee the abundant cold just necessary belt feeder length that increases of aggregate energy, for assurance concrete output the then necessary again width and the radical that increases belt feeder of conveying capacity of aggregate.Simultaneously, producing the screw and vertical tube evaporator of cold water, all is horizontal layout, and cold water circulation pump etc. all need occupy very big position.
The process procedure that another floor space of water-cooled aggregate is big is the water treatment plant.Flow back into back pool behind the cold water spray aggregate, have silt and stone in the water this moment, must could deliver in the screw and vertical tube evaporator again and cool off through cooling again after the filtering of dosing precipitation, thereby enter the lower whorl circulation.
The air-cooling aggregate cooling is then carried out in the aggregate aircooled bin of ground, and aerial cooler and air blast abut against on the limit to be arranged, so floor space is very little.Compare with identical concrete machine outlet temperature, identical production intensity, twice wind cooling aggregate technology saves floor occupying area 70% than conventional concrete precooling technology.
2, the comparison of cold consumption:
The water-cooled aggregate is many because of its process procedure, will occur inevitably heating up in the recovery of water and processing procedure, so cold consumption is bigger.
Air-cooling aggregate then arranges near aggregate that because of its refrigeration end-equipment process procedure is few, and cold wind loops back short out, so cold loss is much smaller relatively.
With identical operating condition relatively; Concrete precooling technology with the comparable routine of the cold aggregate technology of two cold wind is saved refrigeration machine installed capacity about 40%.
3, output investment ratio is:
With the disposable apparatus investment, the water-cooled aggregate is far longer than the twice wind cooling aggregate technology of utilizing, and this is that number of devices is many, and the equipment unit price also is higher than the twice wind cooling technology because of water-cooled aggregate complex process.
From construction investment, water-cooled aggregate floor space is big, and the equipment installation project amount is big, so construction investment is also far above twice wind cooling aggregate technology.
4, operating cost is relatively:
Because of the installation of water-cooled aggregate refrigeration machine is greater than twice wind cooling, so equipment depreciation and institute's energy charge all are higher than twice wind cooling.Another is exactly a water consumption, if only be twice screening aggregate washing water, then only needs 0.5m
3Water/m
3Aggregate, the water-cooled aggregate then needs 2m
3Water/m
3Aggregate.Both compare, with water-cooled aggregate running cost than exceeding 30% with second wind cooling.
5, reliability of operation:
Water content ratio of aggregate was very high after the cooling of water-cooled aggregate was finished, requirement to dehydration is also very high, also be difficult at present accomplishing, the twice wind cooling aggregate is to contact with aggregate with cold wind more than 0 ℃ in the first time during air-cooling aggregate then, can not cause and freeze the storehouse, therefore can suitably lower to the dehydration requirement, aggregate evaporates substantially through air-cooled rear surface moisture content for the first time, carry out again the second time air-cooled just can cool off aggregate and be unlikely with low-temperature cold wind cause and freeze the storehouse, therefore both compare, the whole temperature of twice wind cooling aggregate can add the air-cooled type of cooling well below the water-cooled aggregate, makes concrete machine outlet temperature stabilization ground reach designing requirement.
Below in conjunction with accompanying drawing the present invention is further described.
Fig. 1 is a refrigeration system process chart of the present invention.
Fig. 2 is a cold air circulating system schematic diagram of the present invention.
More than flow process shown in the drawings and structure be embodiments of the invention.Among Fig. 1, "-" is the ammonia pipe, and " s-" is water pipe, and " ls-" is water pipe, and " B-" is defeated ice pipe.Flow process shown in the figure comprises three circulations: the kind of refrigeration cycle of ammonia working medium, water circulation and wind circulation.
The cooling cycle system of ammonia working medium is made up of refrigeration compressor 1, condenser 2, ammonia storage tank 3, choke valve 15, low pressure recycle ammonia storage tank 4, ammonia pump 6 and terminal evaporation equipment.Terminal evaporation equipment has 4 groups: produce the vertical type evaporator 14 of cold water, produce the first cooling by wind system of cold wind, produce the second wind cooling system of cold wind, produce the ice-making system of ice.Ammonia working medium endways in the evaporation equipment by absorbing heat to the phase transition process of gaseous state by liquid state, with the media implementation heat exchange outward of ammonia pipe, reach and make the external agency cool effect.Ammonia working medium circulates in refrigeration compressor 1, condenser 2, ammonia storage tank 3, low pressure recycle ammonia storage tank 4, choke valve 15, ammonia pump 6 and terminal evaporation equipment and produces cold.Endways in the equipment vertical type evaporator 14, the water around ammonia and the ammonia pipe carries out heat exchange, thereby water temperature is reduced produce 4 ℃～6 ℃ cold water, and the cold water of producing is delivered to when needed in the mixer of batching plant and used for ready-mixed concrete.Another purposes of cold water is that 9 ice makings of feed ice maker are used.In the first cooling by wind system, ammonia working medium realizes heat exchange with air in highly effective air cooler 5, and air themperature is reduced.Centrifugal blower 7 is blown into ground with cold air and regulates in the feed bin, allows the aggregate in cold air and the feed bin carry out heat exchange, makes the aggregate temperature reduction.Cooled aggregate is sent to the batching plant feed bin with belt feeder and carries out second wind cooling, further cooling.Carry out the heat-exchanged air temperature with aggregate and rise, get back in the highly effective air cooler, carry out heat exchange with ammonia working medium again, so just formed a wind cyclic process.Carry out same process in the second wind cooling system: ammonia working medium realizes that with air heat exchange reduces air themperature in the highly effective air cooler, cold air is blown into the batching plant feed bin by axial flow blower 8, cold air carries out heat exchange with aggregate in the batching plant feed bin, thereby further reduces aggregate temperature.Through with the heat exchange of aggregate, air themperature rises, and gets back in the highly effective air cooler and carries out heat exchange with ammonia working medium again, enters wind cyclic process for the second time.In ice-making system, ammonia working medium is carried out heat exchange with water in slice ice machine 9, and water is frozen rapidly, produces flake ice, and it is standby at any time that the flake ice of producing falls into ice house 10.When batching plant needed, pneumatic transport equipment 11 was sent into the flake ice in the ice house in the mixer of batching plant aggregate with cooling, sand, cement, additive etc. and is stirred, and produces the low-temperature concrete that meets temperature control requirement.
Water circulates in the water route that connects condenser 2, cooling tower 12 and water pump 13 and carries out.Cooling tower 12 is delivered to cooling water in the condenser 2 by water pump 13 and is carried out heat exchange with ammonia working medium, and ammonia working medium temperature is reduced, and becomes liquid state by gaseous state, enters ammonia storage tank and stores.Cool off in the cooling tower and get back to after the cooling water temperature rising, cooled cooling water is delivered to cooling ammonia working medium in the condenser by water pump again.
Air-cooling aggregate source among the present invention is provided by the ammonia refrigeration system of routine.
The center of air-cooling aggregate is the cold wind closed circulation system, introduces capital equipment and facility on this loop below respectively.
As shown in Figure 2, mainly consisting of of it:
Aggregate cooling silo 16: it act as the storage aggregate, and stand-by after aggregate is cooled off therein.Air-cooled aggregate cooling silo generally is that feed bin is regulated on set ground after utilizing the aggregate regrading for the first time, air-cooled cooling storehouse then utilizes the batching plant feed bin usually for the second time, be equiped with air distribution window and return wind transom in the aggregate cooling silo again, whole cooling storehouse is divided into A, B, three districts of C, order is pre-cooling zone, cooling zone, awards the material district that its dividing line is divided with the center line of air distribution window and return wind transom respectively.The cooling of aggregate is carried out in the cooling zone, is aggregate to be cooled in the pre-cooling zone, and the aggregate that cooling finishes then enters to award expects that the district is stand-by.
Air distribution window 17: its effect is that cold wind is delivered in the feed bin cooling zone equably, and has the backgauge effect concurrently, destroys funnel under the feed bin, guarantees aggregate along layer blanking, and the material that is introduced into is cold first usefulness earlier, and reduce the cold wind resistance as far as possible, and aggregate is evenly cooled off.
Return wind transom 18: its effect is that the cold wind after assurance and the aggregate sufficient heat exchange can successfully be got back in the aerial cooler, guarantees not leak out not cold draining.
Aerial cooler 19: its effect provides the air-cooled low-temperature receiver of aggregate, aerial cooler as air-cooling aggregate generally is the ammonia solution fin-tube heat exchanger, air carries out heat exchange by finned tube and ammoniacal liquor wherein in aerial cooler, will enter aggregate cooling silo in order to the cooling aggregate by the wind pipe-adapting air regulator behind the air cooling-down.
Aerial cooler commonly used in the domestic hydraulic engineering has GKL type highly effective air cooler and KL type aerial cooler, and GKL type highly effective air cooler heat transfer coefficient is 26～30W/m
2℃, the fin tube structure form is the tight packing of base steel pipe aluminium fin cover steel, KL type aerial cooler heat transfer coefficient is 12～15W/m
2℃, the fin tube structure form is a base steel pipe box steel fin, from operating position, GKL type highly effective air cooler has advantages such as heat transfer efficiency height, volume are little, in light weight, corrosion-resistant, easy cleaning, under identical operating position, use its usable floor area of GKL type highly effective air cooler only to be half of KL type aerial cooler.
Air blast 20: its effect is to promote cold wind flow circuit in the enclosed loop that air-cooler, aggregate cooling zone, aerial cooler etc. are formed, the one, make cold wind draw the aggregate heat fully, the 2nd, make cold wind after the intensification enter aerial cooler and cool, thereby enter the next round circulation.
By its version branch, air blast is divided into cfentrifugal blower and axial blower again, the cfentrifugal blower volume is big, weight is also heavy, and wheel speed is lower, and fault rate is lower, generally be used for air-cooling aggregate for the first time, be arranged in ground and regulate cooling limit, storehouse, directly place on the ground, the axial flow blower volume is little, in light weight, but wheel speed is very fast under the equal air quantity, and linear velocity is big, and impeller is easy to wear, advantage is easy for installation, it is less to take up space, and generally is used for air-cooling aggregate for the second time, is placed on the set air-cooler platform of batching plant feed bin outer wall.
See that with the engineering practical operation situation under the sufficient situation of placement location, for the first time air-cooled still for the second time air-cooledly all should preferentially select centrifugal blower for use, its operation is more stable, maintenance is also relatively easy with the replacing accessory.
Airduct 21: its effect is polyphone aerial cooler, air blast and an aggregate cooling silo, to form the cold wind closed circulation system.
Claims (2)
1, a kind of pre-cooling and twice wind cooling process for concrete aggregate, it be included in the batching plant feed bin to aggregate carry out air-cooled, it is characterized in that: aggregate enter the batching plant feed bin carry out air-cooled before, in aggregate precooling storehouse, carried out first cooling by wind, be provided with cold wind delivery wind apparatus in this precooling storehouse, air-cooler and refrigeration system that the storehouse is outside equipped with preparation cold wind are equipped with the miscellaneous equipment that low-temperature receiver is provided.
2, pre-cooling and twice wind cooling process for concrete aggregate according to claim 1 is characterized in that: add flake ice later on again and mix and stir concrete finishing above-mentioned twice wind cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00114455 CN1116156C (en) | 2000-03-31 | 2000-03-31 | Pre-cooling and twice wind cooling process for concrete aggregate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00114455 CN1116156C (en) | 2000-03-31 | 2000-03-31 | Pre-cooling and twice wind cooling process for concrete aggregate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1265349A true CN1265349A (en) | 2000-09-06 |
| CN1116156C CN1116156C (en) | 2003-07-30 |
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ID=4584136
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00114455 Expired - Lifetime CN1116156C (en) | 2000-03-31 | 2000-03-31 | Pre-cooling and twice wind cooling process for concrete aggregate |
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| CN (1) | CN1116156C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102756426A (en) * | 2012-07-06 | 2012-10-31 | 葛洲坝集团第五工程有限公司 | Integrated concrete aggregate pre-cooling and pre-heating device as well as pre-cooling and pre-heating method |
| CN105171921A (en) * | 2015-08-13 | 2015-12-23 | 中国水利水电第八工程局有限公司 | Aggregate air-cooling system for pre-cooled concrete production |
| CN105171920A (en) * | 2015-06-11 | 2015-12-23 | 长江勘测规划设计研究有限责任公司 | Concrete production fine aggregate special-purpose cooling system and cooling method thereof |
| CN105320841A (en) * | 2015-09-21 | 2016-02-10 | 中国电建集团西北勘测设计研究院有限公司 | Determination method for shower water cooled concrete aggregate transient temperature |
| CN107631523A (en) * | 2017-11-06 | 2018-01-26 | 中国水利水电第八工程局有限公司 | A kind of mass concrete cold feed device |
-
2000
- 2000-03-31 CN CN 00114455 patent/CN1116156C/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102756426A (en) * | 2012-07-06 | 2012-10-31 | 葛洲坝集团第五工程有限公司 | Integrated concrete aggregate pre-cooling and pre-heating device as well as pre-cooling and pre-heating method |
| CN105171920A (en) * | 2015-06-11 | 2015-12-23 | 长江勘测规划设计研究有限责任公司 | Concrete production fine aggregate special-purpose cooling system and cooling method thereof |
| CN105171921A (en) * | 2015-08-13 | 2015-12-23 | 中国水利水电第八工程局有限公司 | Aggregate air-cooling system for pre-cooled concrete production |
| CN105171921B (en) * | 2015-08-13 | 2017-05-17 | 中国水利水电第八工程局有限公司 | Aggregate air-cooling system for pre-cooled concrete production |
| CN105320841A (en) * | 2015-09-21 | 2016-02-10 | 中国电建集团西北勘测设计研究院有限公司 | Determination method for shower water cooled concrete aggregate transient temperature |
| CN105320841B (en) * | 2015-09-21 | 2018-02-06 | 中国电建集团西北勘测设计研究院有限公司 | A kind of determination method for spraying water cooling aggregate transient temperature |
| CN107631523A (en) * | 2017-11-06 | 2018-01-26 | 中国水利水电第八工程局有限公司 | A kind of mass concrete cold feed device |
| CN107631523B (en) * | 2017-11-06 | 2023-06-06 | 中国水利水电第八工程局有限公司 | Large-volume concrete cold water supply device |
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| Publication number | Publication date |
|---|---|
| CN1116156C (en) | 2003-07-30 |
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Granted publication date: 20030730 |