CN100361896C - Recovery and utilizing method for energy from borax production by carbon alkali method - Google Patents
Recovery and utilizing method for energy from borax production by carbon alkali method Download PDFInfo
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- CN100361896C CN100361896C CNB2006100459342A CN200610045934A CN100361896C CN 100361896 C CN100361896 C CN 100361896C CN B2006100459342 A CNB2006100459342 A CN B2006100459342A CN 200610045934 A CN200610045934 A CN 200610045934A CN 100361896 C CN100361896 C CN 100361896C
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Abstract
The present invention relates to a method for recovering and utilizing energy in the technology of borax production by a carbon alkali method, which comprises the steps that recovery and utilization of steam condensed water: after being recovered, condensed water of carbon decomposition heating steam in the technical process of borax production by a carbon alkali method directly returns to a boiler to be used as water supply of the boiler; recovery and utilization of the residual heat of feed liquid and the residual heat of tail gases after carbon decomposition: cooling water used during the feed liquid crystallization process is recovered by a heat exchanger, the cooling water is heated by the residual heat of feed liquid and the residual heat tail gases after carbon decomposition, and hot water obtained after heating is used for washing boric sludge of sheet frame filtration. Due to the recovery and utilization of energy in the technology of borax production by a carbon alkali method, the method of the present invention saves the quantity of one time water supply, the water softening cost and the steam consumption on cooling water heating.
Description
One, technical field: the present invention relates to a kind of recoverying and utilizing method of producing energy in the borax technology, particularly the method for utilizing with energy recovery in the technology of carbon alkali method for producing borax.
Two, background technology: external borax production, because the difference of raw material seldom adopts the production of carbon alkaline process.As U.S.'s boron resource is the tincal ore deposit, only needs the hot water leaching, and crystallisation by cooling gets final product; Turkey, Russia mostly are colemanite, generally take sulfuric acid to decompose preparing boric acid after, reacts with soda ash again and produce borax, and its enterprise's energy recovery utilizes technology also very general and ripe.
Domestic boron rock mainly is szaibelyite and ludwigite resource, at present carbon alkali process production boraxs that adopt more, and its steam energy all is disposable consuming, and does not go to consider the recycling of waste heat.Except that subjective thinking little of, mainly there is the problem of Technology aspect.The operation that needs consumption steam to heat in technology of carbon alkali method for producing borax mainly is the carbonization decomposition process, because of its reaction requires to be incubated 12～20 hours (according to the raw material difference in 125～135 ℃ of scopes, the reaction times difference), get rid of corresponding carbon simultaneously and separate tail gas, its pressure is 4～4.5kg/cm
2, temperature is between 125～135 ℃; Next is to filter operation washery slag hot water, and most producers recovery carbon is separated the steam condensate of heating and mixed cold water, consumes the heating of part open steam again; Even do not reclaim water of condensation and, consume a large amount of steam with the heating of cold water open steam.Also has interim dredging pipeline and treatment facility fouling consumption part steam in the technology in addition.Obviously, carbon dioxide-soda reaction, the steam that consumed of reaction of heating are justifiable, but its constantly the heat that carries of discharge tail gas then waste, this is one of the waste heat that can recycle.Two, if being used for carbon separates the water of condensation of remollescent of heating steam and can directly get back to the boiler house, both improved the boiler water filling temperature, and can reach 85～95 ℃, that has saved boiler again once goes up the water yield and the softening water yield, significant equally.Three, ((temperature is 85～90 ℃ to 200～300g/l) feed liquid to filter the back borax, or title " magnanimous water "), need change next procedure over to and carry out crystallisation by cooling with cold water, simultaneously with the feed liquid refrigerative, the temperature of cold water is also improved accordingly, this part has been enhanced the hot water of temperature, all not to its recycling, it is slatterned in vain now.
Three, summary of the invention:
1, goal of the invention: the recoverying and utilizing method that the invention provides energy in a kind of technology of carbon alkali method for producing borax, its objective is that remaining thermal energy major part is wasted in the solution technology of carbon alkali method for producing borax, well do not recycled, and now not under the prerequisite that does not influence the borax quality, to the problem of aspects such as the good recoverying and utilizing method of these energy existence.
2, technical scheme: the present invention is achieved through the following technical solutions:
The recoverying and utilizing method of energy in a kind of technology of carbon alkali method for producing borax is characterized in that: this method is undertaken by following step:
A, reclamation of condensate water are utilized step: directly return the last water of boiler as boiler after the water of condensation that carbon in the technological process of carbon alkali method for producing borax is separated heating steam reclaims;
B, carbon separate back feed liquid waste heat and carbon is separated using waste heat from tail gas recycling step: after the cold water that uses in the feed liquid crystallisation process is reclaimed by interchanger, separate the back waste heat of feed liquid and the waste heat that carbon is separated tail gas heats with carbon, the hot water that obtains after the heating is used to wash the filtering boron sludge of sheet frame.
Among the above-mentioned steps b carbon is separated the back waste heat of feed liquid and the UTILIZATION OF VESIDUAL HEAT IN that carbon is separated tail gas is: with the cold water that uses in the feed liquid Crystallization Procedure through feed liquid heating back with an interchanger recovery, carbon is separated after filter feed liquid above-mentioned interchanger of elder generation's process before entering Crystallization Procedure that operation is handled, the water that reclaims in the heat exchanging device carries out the part heating, and the recycle-water of last interchanger being sent here with the waste heat that another interchanger recovery carbon is separated tail gas heats once more, reach the segmentation recovery waste heat that adds up continuously, the water temperature of heating back hot water reaches 85～90 ℃.
Water of condensation as boiler water filling after reclaiming among the above-mentioned steps a is a softening water, and its temperature reaches 85～95 ℃.
3, advantage and effect: by the enforcement of technical solution of the present invention, the energy major part that can solve waste heat in the technology of carbon alkali method for producing borax well slatterns, well do not recycled, and now not under the prerequisite that does not influence the borax quality, to the problem of aspects such as the good recoverying and utilizing method of these energy existence.The invention provides a kind of recoverying and utilizing method of energy, reclaiming the Lowlevel thermal energy that is wasted in the borax production technique is used further in the production technique, thereby reduce the consumption of bunker coal, the wet goods energy and softening water resource for enterprise, reduce cost, and the finished product borax yield is constant after adopting recoverying and utilizing method of the present invention, quality product is qualified, and is unaffected.
By adopting energy recovery of the present invention to utilize method, can reach following index:
1), carbon is separated the heating steam water of condensation and is all got back to the boiler operation, the steam water that circulates once more and produce as boiler;
2), filter, hot water that the washing boron sludge is used, utilize recovery waste heat to improve temperature, no longer consume direct-fired steam;
3), technic index can reach: 85～95 ℃ of boiler water filling temperature, 85～90 ℃ of sheet frame wash water temperature, carbon is separated heating steam pressure 0.25～0.3mPa, carbon is separated 125～135 ℃ of temperature, 25～30 ℃ of Tcs;
1), utilize the carbonization rate of decomposition and the yield of boron trioxide in the process not to reduce in energy recovery.
Four, description of drawings: accompanying drawing 1 is process method flow chart of the present invention.
Five, embodiment:
The present invention is a kind of under the constant substantially prerequisite of tincal production technique, and in conjunction with the characteristics of borax production technique, to the energy recovery utilization that produces in its production process, mainly be divided into the situation of two kinds of recyclings: one, water of condensation reclaims the last water of back as boiler; Two, obtain the waste heat of feed liquid and the waste heat that carbon is separated tail gas after use carbon is separated, the cold water that uses in the feed liquid crystallisation process that reclaims by heat exchanging apparatus is heated, make its temperature reach 85～90 ℃, come boron sludge on the cleaning and filtering sheet frame with it; Do not influence the carbonization rate of decomposition and the yield of boron trioxide in the process of the present invention to the excess energy recycling, recoverying and utilizing method of the present invention is not only applicable in the technology of carbon alkali method for producing borax, is suitable for simultaneously in the boric acid production technique recycling to waste heat yet.
Embodiment 1:
As shown in Figure 1, the recoverying and utilizing method of energy in the technology of carbon alkali method for producing borax of the present invention, this method is undertaken by following step:
A, reclamation of condensate water are utilized step: to separate the water of condensation of heating steam be softening water to carbon in the technological process of carbon alkali method for producing borax, its temperature reaches 85～95 ℃, this water of condensation is recovered to the tank that is connected with steam boiler, direct last water as boiler;
B, carbon separate back feed liquid waste heat and carbon is separated using waste heat from tail gas recycling step: earlier the cold water after the heating of feed liquid waste heat that uses in the feed liquid crystallisation process is reclaimed by an interchanger, carbon is separated after filter feed liquid above-mentioned interchanger of elder generation's process before entering Crystallization Procedure that operation is handled, the water that reclaims in the heat exchanging device carries out the part heating, and the water that reclaims after the recovery that waste heat that carbon separates tail gas sends here last interchanger with another interchanger heats once more, reach the segmentation recovery waste heat that adds up continuously, the water temperature of heating back hot water reaches 85～90 ℃.The hot water that obtains is used to wash the filtering boron sludge of sheet frame.
Embodiment 2: in 30,000 tons of/year scale borax production technique, formerly often open three 4 tons of/hour boilers, after utilizing energy recovery of the present invention to utilize method, realized that two boilers can satisfy the production needs.Through experiment operation after a while, concrete technic index can reach: 85～95 ℃ of boiler water filling temperature, and 85～90 ℃ of sheet frame wash water temperature, carbon is separated heating steam pressure 0.25～0.3mPa, and carbon is separated 125～135 ℃ of temperature, 25～30 ℃ of Tcs; The carbonization rate of decomposition and the yield of boron trioxide do not reduce, and borax is up-to-standard.Can realize 15 tons in day fuel saving coal on the economic target, save 2～2.5 tons/month of salt of softening water, guestimate, 2,220,000 yuan of year saving expenses.Be equivalent to produce per year the producer of ten thousand tons of borax scales, but cost saving in every year 60～700,000 yuan, borax cost just per ton descends 60～70 yuan, and economic benefit is considerable.The present invention reaches the recovery heat, economizes on resources, and reduces production costs.
The recoverying and utilizing method of energy of the present invention reduces the consumption of enterprise energy, resource, reduces cost, and does not influence the yield of the finished product, and quality product is qualified.
Claims (3)
1. the recoverying and utilizing method of energy in the technology of carbon alkali method for producing borax, it is characterized in that: this method is undertaken by following step:
A, reclamation of condensate water are utilized step: directly return the last water of boiler as boiler after the water of condensation that carbon in the technological process of carbon alkali method for producing borax is separated heating steam reclaims;
B, carbon separate back feed liquid waste heat and carbon is separated using waste heat from tail gas recycling step: after the cold water that uses in the feed liquid crystallisation process is reclaimed by interchanger, separate the back waste heat of feed liquid and the waste heat that carbon is separated tail gas heats with carbon, the hot water that obtains after the heating is used to wash the filtering boron sludge of sheet frame.
2. the recoverying and utilizing method of energy in the technology of carbon alkali method for producing borax according to claim 1, it is characterized in that: among the above-mentioned steps b carbon is separated the back waste heat of feed liquid and the UTILIZATION OF VESIDUAL HEAT IN that carbon is separated tail gas is: with the cold water that uses in the feed liquid Crystallization Procedure through feed liquid heating back with an interchanger recovery, carbon is separated after filter feed liquid above-mentioned interchanger of elder generation's process before entering Crystallization Procedure that operation is handled, the water that reclaims in the heat exchanging device carries out the part heating, and the recycle-water of last interchanger being sent here with the waste heat that another interchanger recovery carbon is separated tail gas heats once more, reach the segmentation recovery waste heat that adds up continuously, the water temperature of heating back hot water reaches 85～90 ℃.
3. the recoverying and utilizing method of energy in the technology of carbon alkali method for producing borax according to claim 1 is characterized in that: the water of condensation as boiler water filling after reclaiming among the above-mentioned steps a is a softening water, and its temperature reaches 85～95 ℃.
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| CNB2006100459342A CN100361896C (en) | 2006-03-01 | 2006-03-01 | Recovery and utilizing method for energy from borax production by carbon alkali method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1033434A1 (en) * | 1981-06-11 | 1983-08-07 | Предприятие П/Я В-8830 | Method for producing borax |
| CN1007113B (en) * | 1985-04-01 | 1990-03-07 | 索尼公司 | Digital data converting method and apparatus thereof |
| CN1016912B (en) * | 1986-12-11 | 1992-06-03 | 兰托公司 | Cable, expandable tape for cables and use thereof |
| RU2082671C1 (en) * | 1994-09-08 | 1997-06-27 | Акционерное общество открытого типа "Бор" | Method for production of sodium tetraborate |
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- 2006-03-01 CN CNB2006100459342A patent/CN100361896C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1033434A1 (en) * | 1981-06-11 | 1983-08-07 | Предприятие П/Я В-8830 | Method for producing borax |
| CN1007113B (en) * | 1985-04-01 | 1990-03-07 | 索尼公司 | Digital data converting method and apparatus thereof |
| CN1016912B (en) * | 1986-12-11 | 1992-06-03 | 兰托公司 | Cable, expandable tape for cables and use thereof |
| RU2082671C1 (en) * | 1994-09-08 | 1997-06-27 | Акционерное общество открытого типа "Бор" | Method for production of sodium tetraborate |
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