CN102849769B - Method and device capable of simultaneously providing various cleheat sources to prepare polyaluminum chloride - Google Patents

Method and device capable of simultaneously providing various cleheat sources to prepare polyaluminum chloride Download PDF

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CN102849769B
CN102849769B CN2012103578245A CN201210357824A CN102849769B CN 102849769 B CN102849769 B CN 102849769B CN 2012103578245 A CN2012103578245 A CN 2012103578245A CN 201210357824 A CN201210357824 A CN 201210357824A CN 102849769 B CN102849769 B CN 102849769B
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heat
air
chamber
temperature
aluminium chloride
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CN102849769A (en
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晏永祥
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长沙理工大学
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency

Abstract

The invention discloses a method and a device capable of simultaneously providing various clean heat sources to prepare a polyaluminum chloride. The method includes preparing clean high temperature hot wind, performing heat supply by a conduction oil heat exchanger, performing heat supply by a vapor generator, performing heat supply by a spray dryer, performing hot wind purification by the spray dryer and performing tail gas treatment. The method and the device capable of simultaneously providing various clean heat sources to prepare the polyaluminum chloride have the advantages that heat supply systems are centralized, the heat supply efficiency is high, and polyaluminum chloride product production is low in energy consumption, small in pollution and low in operating cost.

Description

Provide simultaneously multiple cleaning heat source for the method and the device thereof that prepare poly aluminium chloride

Technical field

The present invention relates to a kind ofly provides multiple cleaning heat source for the method for preparing poly aluminium chloride simultaneously, the invention still further relates to a kind ofly to realize that this provides the device of multiple cleaning heat source for the method for preparing poly aluminium chloride simultaneously.

Background technology

Poly aluminium chloride is outstanding water purification agent product, market demand increases substantially year by year, China is poly aluminium chloride products production big country, 2011 annual production are over 1,500,000 tons, but the poly aluminium chloride industry is a sufficient industry of market competition, produce threshold low, in industry, manufacturing enterprise reaches hundreds of families, the industrial scale major part is in ten thousand ton/years of left and right of 1-2, and large enterprises seldom.

The production of poly aluminium chloride is mainly to adopt bauxitic clay, calcium aluminate, aluminium hydroxide, sodium aluminate and hydrochloric acid etc. as raw material, at first in temperature, be reaction more than 100 ℃, the synthetic fluid poly aluminium chloride, and then be dried into solid phase prod with drying machine, thermal source has high-temperature steam, high temperature heat conductive oil and high-temperature hot-air, drying machine has two kinds of roller dryer and spray-driers, at present, the drying production of domestic poly aluminium chloride, adopt the enterprise of sweat roll drying machine production to account for major part, for traditional mode of production enterprise, this portioned product accounts for national output 50% left and right.The sweat roll drying machine is produced, because the drying source temperature is low, can only dry basicity higher than 93% product, the liquid oxidation aluminium content of this series products only has 10% left and right, therefore, production energy consumption is high, and the coal consumption of ton product is up to 500kg, in addition, for the basicity that guarantees product higher than 93%, in production process, must add a large amount of bauxitic clays and calcium aluminate raw material, in product, heavy metal content is high, can only use for sewage disposal; In recent years, domestic successful is developed conduction oil rotary drum drier and is replaced the sweat roll drying machine to produce solid phase prod, its core is to adopt conduction oil hot blast stove band waste heat steam boiler, the thermal oil recycle, the steam that waste heat boiler produces is for the production of the liquid poly aluminium chloride, the existing Some Enterprises of this technology is used, and output accounts for 20% left and right of national output.Conduction oil rotary drum drier is produced, because the drying source temperature is high, can dry basicity higher than 88% liquid poly aluminium chloride product, the liquid oxidation aluminium content of this series products can reach 12% left and right, therefore, production energy consumption is lower, 300kg is only used in the coal consumption of ton product, in addition, because the basicity of liquid product is reduced to 88%, in production process, the available hydrogen alumina raw material replaces the part bauxitic clay, and the calcium aluminate consumption has also reduced, so the product that in product, the comparable sweat roll drying machine of heavy metal content is produced is low; This technical deficiency part is that the heat-conducting oil furnace hot blast need to increase dusting and desulfuring system, hot blast with heat fail to be fully used; The technology content that adopts spray-drier to produce is higher, and facility investment is large, is nearly ten times of roller dryer, therefore adopts the enterprise of this method drying few, and this portioned product accounts for national output 30% left and right.But spray-drier production efficiency is high, single machine yield is large, long service life, be more than ten times of roller dryer work-ing life, produce strong adaptability, can produce any poly aluminium chloride product that basicity is greater than 40%, as when producing basicity and being the product of 70%-80%, the alumina content of liquid poly aluminium chloride can be controlled to 13.5%-14.5%, when the production basicity is the product of 40%-50%, the alumina content of liquid poly aluminium chloride reaches 18.0%-19.0%, and the moisture that dry like products need to evaporate is less.It is the hot blast that temperature is higher that spray-drier is produced thermal source, the heat supply of indirect heat exchange chain hotblast stove is mainly adopted in the production of conventionally spray-dried machine, thermo-efficiency is the highest only has 70% left and right, and interchanger needs often cleaning, otherwise can reduce the parallel operation heat exchange efficiency, make overall thermal efficiency lower than 70%, the flue gas that coal combustion produces also will increase desulfurization and dust removal equipment, the production basicity is 70%-80%, when alumina content can be controlled to the poly aluminium chloride product of 13.5%-14.5%, the coal consumption of ton product reaches 380-400kg, in addition, the production of liquid poly aluminium chloride also needs to build the steam boiler steam supply, this spraying drying mode has more than 20 year history, its output still accounts for 50% of spray dried prod at present.In recent years, domestic successful has been developed the spraying drying production technology of direct-combustion furnace heat supply, its core is to adopt direct combustion hot-air furnace, directly using flue as the spraying drying thermal source, thermo-efficiency reaches more than 90%, and production system does not need separately to build desulfurization and dust removal equipment, the production basicity is 70%-80%, when alumina content can be controlled to the poly aluminium chloride product of 13.5%-14.5%, 300-320kg was only used in the coal consumption of ton product, and the output that adopts this technology to produce has accounted for 50% of spray dried prod at present.This technical deficiency part is that system does not produce steam, and producing liquid poly aluminium chloride workshop section also needs to increase the steam boiler heat supply, and little steam boiler environmental impact assessment be difficult to by.

Summary of the invention

First technical problem to be solved by this invention is to provide a kind of heating system and concentrates, and heating efficiency is high, and poly aluminium chloride products production energy consumption is low, pollutes littlely, when working cost is low, provides multiple cleaning heat source confession to prepare the method for poly aluminium chloride.

Second technical problem to be solved by this invention is to provide and a kind ofly realizes that heating system concentrates, and heating efficiency is high, and poly aluminium chloride products production energy consumption is low, pollutes littlely, when working cost is low, provides multiple cleaning heat source confession to prepare the device of poly aluminium chloride.

In order to solve above-mentioned first technical problem, to the invention provides, provide simultaneously multiple cleaning heat source for the method for preparing poly aluminium chloride, comprise the following steps:

1) prepare clean high-temperature hot-air: coaling machine is delivered to the coal burning machine combustion chamber by fire coal, coal-fired high-temperature hot-air 600-900 ℃ of combustion chambers burn generation, burner blower is delivered to the high temperature purification chamber by hot blast and is purified, after purification, by three high-temperature gate valves, control the exhaust gas volumn of leading to heat-condutive oil heat exchanger, vapour generator and wind mixed chamber respectively, guarantee the properly distributed of high-temperature flue gas;

2) heat-condutive oil heat exchanger heat supply: come the high-temperature hot-air of Self-air-heating decontamination chamber and the interior thermal oil of heat-condutive oil heat exchanger heating chamber boiler tube to carry out heat exchange, the heating thermal oil, high temperature heat conductive oil after heating, as the roller dryer thermal source, from roller dryer low temperature deep fat out, return to the heat-condutive oil heat exchanger heating chamber, then carry out heat exchange with high-temperature hot-air, recycle; Low temperature hot blast after heat exchange, through air inducing power traction back-mixing air compartment, carries out second stage employ;

3) vapour generator heat supply: come the high-temperature hot-air of Self-air-heating decontamination chamber and the interior water of vapour generator heating chamber boiler tube to carry out heat exchange, water is heated into to steam, for the liquid poly aluminium chloride, produce, the low temperature hot blast after heat exchange, through air inducing power traction back-mixing air compartment, carries out second stage employ;

4) spray-drier heat supply: the high-temperature hot-air that comes the Self-air-heating decontamination chamber respectively with low temperature hot blast from heat-condutive oil heat exchanger, from the low temperature hot blast of vapour generator with mix in wind mixed chamber from the normal temperature air in atmosphere, high-temperature hot-air after the mixing temperature adjustment from wind mixed chamber out, through one group of cyclonic separator, carry out dry method dust, hot blast after further purifying enters spray-drier, as the thermal source of liquid poly aluminium chloride drying;

5) the spray-drier hot blast purifies and vent gas treatment: after high-temperature hot-air enters spray-drier, heat in hot blast, sulfurous gas and a small amount of dust are atomized into very tiny poly aluminium chloride drop absorption cleaning, from spray-drier low temperature hot blast out, enter the acid mist recovery tower, water with atomization in the acid mist recovery tower reclaims contained a small amount of poly aluminium chloride dust in hot blast, and further reduce the temperature of hot blast, then it is entered to atmosphere, entering sulfurous gas and dust content in the low temperature hot blast of atmosphere is zero, the hot water that the acid mist recovery tower reclaims, be back to the production of liquid poly aluminium chloride.

Above-mentioned steps 2) heat-condutive oil heat exchanger is for hankering: the high-temperature hot-air that the coal burning machine combustion chamber produces enters the purification hot air chamber after the dedusting of high temperature purification chamber, then by high-temperature gate valve, guide to the heat-condutive oil heat exchanger heating chamber, with thermal oil in boiler tube, carry out heat exchange, by heat-conducting oil heating to 350 ℃.

Above-mentioned steps 3) vapour generator is for hankering: it is the high-temperature steam of 180 ℃ that the water of vapour generator is heated to form temperature, the thermal source that this steam is produced as the liquid poly aluminium chloride.

In order to solve above-mentioned second technical problem, realization provided by the invention provides the device of multiple cleaning heat source for the method for preparing poly aluminium chloride simultaneously, coal burning machine is connected with the high temperature purification chamber, described high temperature purification chamber is connected with the purification hot air chamber, described purification hot air chamber is connected with vapour generator by the first valve, the vapour pipe of described vapour generator is connected with steam and divides drum, the hot blast end of described vapour generator adopts the first induced draft fan to be connected with wind mixed chamber, described purification hot air chamber connects described wind mixed chamber by second valve, described wind mixed chamber is provided with air intlet, described purification hot air chamber is connected with the air intake of heat-condutive oil heat exchanger by the 3rd valve, the outlet air end of described heat-condutive oil heat exchanger is connected with described wind mixed chamber 7 by the second induced draft fan, described wind mixed chamber is connected with the air intake of spray-drier by tornado dust collector, the outlet air end of described spray-drier is connected with the first acid mist recovery tower, the air outlet of described the first acid mist recovery tower is connected with the first chimney by the 3rd induced draft fan, the drain side of described the first acid mist recovery tower is connected with the first recycle pump, described the first circulation pump outlet is connected with poly-aluminium liquid workshop with described the first acid mist recovery tower respectively, the deep fat end of described heat-condutive oil heat exchanger is connected with the heat exchange entrance end of roller dryer, the heat exchange exit end of described roller dryer is connected with the thermal oil return tank, described thermal oil return tank is connected with the cold oil end of described heat-condutive oil heat exchanger by the thermal oil transferpump, the air outlet of described roller dryer is connected with the second acid mist recovery tower, the air outlet of described the second acid mist recovery tower is connected with the second chimney by the 4th induced draft fan, the drain side of described the second acid mist recovery tower is connected with the second recycle pump, described the second circulation pump outlet is connected with poly-aluminium liquid workshop with described the second acid mist recovery tower respectively.

When adopting technique scheme, provide multiple cleaning heat source for the method and the device thereof that prepare poly aluminium chloride, heat-condutive oil heat exchanger heat supply coal consumption: 2) in step, heat-condutive oil heat exchanger is mainly roller dryer production heat supply, and the coal consumption of ton solid phase prod is 260~280kg/ ton poly aluminium chloride.Vapour generator heat supply coal consumption: 3) in step, vapour generator produces 0.6MPa steam, produces for the liquid poly aluminium chloride, and coal consumption is 150~160kg/ ton steam.Spray-drier heat supply coal consumption: 4) in step, the coal consumption of spray-drier production solid phase prod is the high-purity poly aluminium chloride of 160~180kg/ ton.Spray-drier heat supply coal consumption: 4) in step, the coal consumption of spray-drier production solid phase prod is the common poly aluminium chloride of 260~280kg/ ton.

The method that the invention provides multiple cleaning heat source can be used 4500-7000kcal/kg, the common bituminous coal of sulphur content 0-4%, institute's heat supplied can prepare the solid phase prods such as liquid poly aluminium chloride, the yellow poly aluminium chloride of technical grade, the light yellow poly aluminium chloride of tap water level or high-purity grade of white poly aluminium chloride simultaneously, boiler slag carbon content is lower than 3%, coal-fired heat utilization efficiency reaches more than 90%, system enters the gas temperature of atmosphere lower than 50 ℃, and in institute's emission gases, dust and content of sulfur dioxide are zero; Thermal oil carrier used recycle, the high-temperature steam that vapour generator produces is realized second stage employ, water vapor and acid mist cold water spray-absorption that the poly aluminium chloride production process produces, institute's restored acid water hot in nature is for liquid poly aluminium chloride products production, in system production process, by selling the partially liq product, keep the balanced use of water, realize sewage zero-discharge.

With 6000kcal/kg, the common bituminous coal of sulphur content 2% is fuel, per hour require to produce 3.5 tons of poly aluminium chlorides (amounting to solid phase prod), comprise that the yellow product of technical grade per hour produces 2.0 tons of (1.5 tons of product roller dryer dryings wherein, as liquid product, sell for other 0.5 ton, do not need drying) and the light yellow product of tap water level per hour produce 1.5 tons, tap water level poly aluminium chloride spray-drier drying.This total heat capacity in system combustion chamber is 5,300,000 kcal/ hour, the dry heat supplied needed of roller dryer is 2,000,000 kcal/ hour, the heat supplied of liquid poly aluminium chloride need of production is 1,000,000 kcal/ hour, the heat supplied that spray-drier needs is 1,900,000 kcal/ hour, thermosteresis 400,000 kcal/ hour, total heat utilization efficiency is 92.5%, production process per hour consumes coal 884kg, wherein the dry coal consumption of roller dryer is ton product 222kg, the dry coal consumption of spray-drier is ton product 211kg, bituminous coal combustion produces sulphur content and is 17.7kg per hour, the poly aluminium chloride product of all being produced by spray-drier absorbs, in product, sulphur content is ton product 11.8kg, account for 1.18%, form with calcium sulfite is present in product, can not affect quality product.

With 4500kcal/kg, the bituminous coal of sulphur content 4% is fuel, per hour require to produce 3.5 tons of poly aluminium chlorides (amounting to solid phase prod), comprise that the yellow product of technical grade per hour produces 2.0 tons of (1.5 tons of product roller dryer dryings wherein, as liquid product, sell for other 0.5 ton, do not need drying) and high-purity grade of white products per hour produce 1.5 tons, high-purity poly aluminium chloride spray-drier drying.This total heat capacity in system combustion chamber is 5,300,000 kcal/ hour, reality is 5,200,000 kcal/ hour by heat, the dry heat supplied needed of roller dryer is 2,000,000 kcal/ hour, the heat supplied of liquid poly aluminium chloride need of production is 1,100,000 kcal/ hour, the heat supplied that spray-drier needs is 1,700,000 kcal/ hour, thermosteresis 400,000 kcal/ hour, total heat utilization efficiency is 92.3%, production process per hour consumes coal 1156kg, wherein the dry coal consumption of roller dryer is ton product 296.3kg, the dry coal consumption of spray-drier is ton product 251.9kg, bituminous coal combustion produces sulphur content and is 46.3kg per hour, the poly aluminium chloride product of all being produced by spray-drier absorbs, in product, sulphur content is ton product 30.9kg, account for 3.1%, form with Tai-Ace S 150 is present in product, can not affect quality product.

Technical scheme of the present invention can produce following technique effect:

At first the present technique heat supplying process produces high-temperature hot-air by burner, after high-temperature dust removal, as heat-condutive oil heat exchanger, vapour generator and spray-drier, uses respectively the thermal source of wind mixed chamber.During for heat-condutive oil heat exchanger, low temperature hot blast after heat exchange all draws the back-mixing air compartment and carries out second stage employ, the flue gas of the 180 ℃ formed waste of must draining while having avoided independent use heat-conducting oil furnace, do not need to build again desulfurating dust removing device for flue gas yet, and because the hot blast of heat-condutive oil heat exchanger that present technique supplies is cleaner, do not need often to clear up heat exchanger, heat exchange efficiency is high, and operation power and working cost are all lower; During for vapour generator, low temperature hot blast after heat exchange also all draws the back-mixing air compartment and carries out second stage employ, the flue gas of the 180 ℃ formed waste of must draining while having avoided independent use steam boiler, do not need to build again desulfurating dust removing device for flue gas yet, and because the hot blast of vapour generator that present technique supplies is cleaner, heat exchange efficiency is high, and operation power and working cost are all lower; During for wind mixed chamber, the low temperature hot blast drawn back with the low temperature hot blast drawn back from heat-condutive oil heat exchanger, from vapour generator and directly mixing from the normal temperature air atmosphere, thermosteresis is little, the hot blast mixed is through the further udst separation of cyclonic separator group, the hot blast quality can meet the industrial production needs, can not affect quality product, hot blast is after spray-drier is used, sulfurous gas wherein and a small amount of dust are all absorbed by the liquid poly aluminium chloride, in the gas discharged, dust and content of sulfur dioxide are zero, and system enters the gas temperature of atmosphere lower than 50 ℃.The heating equipment of this heat supply method is installed compact, and device structure is simple, takes up an area less, is convenient to insulation, is convenient to operational management, reduced investment, and hot service efficiency is up to more than 90%; This heat supply method can provide multiple cleaning heat source simultaneously, can meet the large industrial production of poly aluminium chloride product and use; While adopting this heat supply method, produce in heat supplying process and only have an exhaust outlet, and dust and sulfurous gas is zero release, environmental-protecting performance is very good.Present technique is not subjected to poly aluminium chloride to manufacture the restriction of raw material, and producing is common bituminous coal with coal, is suitable for promoting the use of.

The technology of the present invention has following characteristics: 1, produce heat supplying process central heating, concentrated dust-removing, three heating systems share a burner and a dust settling chamber, only need a fire coal to park a little; Burner, dust settling chamber, wind mixed chamber, purification hot air chamber, heat-condutive oil heat exchanger, vapour generator and tornado dust collector, near installation, take up an area less, are convenient to insulation and daily administration.2, heating system can produce three kinds of cleaning heat sources, high temperature heat conductive oil, high-temperature steam and high-temperature hot-air simultaneously; It is clean hot blast that high temperature heat conductive oil and high-temperature steam are produced high-temperature hot-air used, the equipment heat exchange efficiency is high, and the heat interchanging area needed is little, has reduced equipment volume and occupation area of equipment, and the low temperature hot blast after heat exchange all carries out second stage employ, improved heat utilization efficiency; 3, dust and sulfurous gas are realized zero release, and the hot blast produced in the heat supply production process is finally all guided to spray-drier and used, and only has an exhaust outlet.After high-temperature hot-air enters spray-drier, heat in hot blast, sulfurous gas and a small amount of dust are atomized into very tiny poly aluminium chloride drop absorption cleaning, from spray-drier low temperature hot blast out, enter the acid mist recovery tower, cold water with atomization in the acid mist recovery tower reclaims contained a small amount of poly aluminium chloride dust and sour gas in hot blast, then it is entered to atmosphere, entering sulfurous gas and dust content in the low temperature hot blast of atmosphere is zero.4, this heat supply method can meet the needs of poly aluminium chloride industry industrialized production, production process is not subjected to the restriction of raw material and range of product, raw materials for production can be used the aluminum-containing raw materials such as bauxitic clay, calcium aluminate, aluminium hydroxide and sodium aluminate, produce product and comprise technical grade poly aluminium chloride, tap water level poly aluminium chloride and high-purity grade of white poly aluminium chloride etc.5, fuel used is common bituminous coal, 4500-7000kcal/kg, and the common bituminous coal of sulphur content 0-4% all can be used.

In sum, the present invention is that a kind of heating system is concentrated, and heating efficiency is high, and poly aluminium chloride products production energy consumption is low, pollutes littlely, when working cost is low, provides multiple cleaning heat source confession to prepare method and the device thereof of poly aluminium chloride.

The accompanying drawing explanation

Fig. 1 is apparatus structure schematic diagram of the present invention.

Embodiment

Following examples are intended to illustrate that the present invention rather than the present invention further limit, and embodiments of the present invention can be implemented in the described any mode of summary of the invention.

Referring to Fig. 1, coal burning machine 1 is provided with mucking machine 19, burner blower 20 and coaling machine 21, coal burning machine 1 is connected with high temperature purification chamber 2, high temperature purification chamber 2 is connected with and purifies hot air chamber 3, purify hot air chamber 3 and be connected with vapour generator 5 by the first valve 8, the vapour pipe of vapour generator 5 is connected with steam and divides drum 4, steam divides an outlet of drum 4 to lead to the poly-aluminium liquid of roller drying workshop, the poly-aluminium liquid of spraying drying workshop is led in another outlet, the hot blast end of vapour generator 5 adopts the first induced draft fan 6 to be connected with wind mixed chamber 7, purify hot air chamber 3 and connect wind mixed chamber 7 by second valve 9, wind mixed chamber 7 is provided with air intlet 29, purify hot air chamber 3 and by the 3rd valve 10, be connected with the air intake of heat-condutive oil heat exchanger 11, the outlet air end of heat-condutive oil heat exchanger 11 is connected with wind mixed chamber 7 by the second induced draft fan 12, wind mixed chamber 7 is connected with the air intake of spray-drier 14 by tornado dust collector 13, the outlet air end of spray-drier 14 is connected with the first acid mist recovery tower 15, the air outlet of the first acid mist recovery tower 15 is connected with the first chimney 18 by the 3rd induced draft fan 17, the drain side of the first acid mist recovery tower 15 is connected with the first recycle pump 16, the outlet of the first recycle pump 16 is connected with poly-aluminium liquid workshop with the first acid mist recovery tower 15 respectively, the deep fat end of heat-condutive oil heat exchanger 11 is connected with the heat exchange entrance end of roller dryer 26, the heat exchange exit end of roller dryer 26 is connected with thermal oil return tank 27, thermal oil return tank 27 is connected with the cold oil end of heat-condutive oil heat exchanger 11 by thermal oil transferpump 28, the air outlet of roller dryer 26 is connected with the second acid mist recovery tower 25, the air outlet of the second acid mist recovery tower 25 is connected with the second chimney 22 by the 4th induced draft fan 23, the drain side of the second acid mist recovery tower 25 is connected with the second recycle pump 24, the outlet of the second recycle pump 24 is connected with poly-aluminium liquid workshop with the second acid mist recovery tower 25 respectively.

Referring to Fig. 1, provide simultaneously multiple cleaning heat source for the method for preparing poly aluminium chloride, step is as follows:

1) prepare clean high-temperature hot-air: coaling machine is delivered to the coal burning machine combustion chamber by fire coal, coal-fired high-temperature hot-air 600-900 ℃ of combustion chambers burn generation, burner blower is delivered to the high temperature purification chamber by hot blast and is purified, after purification, by three high-temperature gate valves, control the exhaust gas volumn of leading to heat-condutive oil heat exchanger, vapour generator and wind mixed chamber respectively, guarantee the properly distributed of high-temperature flue gas;

2) heat-condutive oil heat exchanger heat supply: come the high-temperature hot-air of Self-air-heating decontamination chamber and the interior thermal oil of heat-condutive oil heat exchanger heating chamber boiler tube to carry out heat exchange, by heat-conducting oil heating to 350 ℃, high temperature heat conductive oil after heating, as the roller dryer thermal source, from roller dryer low temperature deep fat out, return to the heat-condutive oil heat exchanger heating chamber, then carry out heat exchange with high-temperature hot-air, recycle; Low temperature hot blast after heat exchange, through air inducing power traction back-mixing air compartment, carries out second stage employ;

3) vapour generator heat supply: come the high-temperature hot-air of Self-air-heating decontamination chamber and the interior water of vapour generator heating chamber boiler tube to carry out heat exchange, it is the high-temperature steam of 180 ℃ that the water of vapour generator is heated to form temperature, for the liquid poly aluminium chloride, produce, low temperature hot blast after heat exchange, through air inducing power traction back-mixing air compartment, carries out second stage employ;

4) spray-drier heat supply: the high-temperature hot-air that comes the Self-air-heating decontamination chamber respectively with low temperature hot blast from heat-condutive oil heat exchanger, from the low temperature hot blast of vapour generator with mix in wind mixed chamber from the normal temperature air in atmosphere, high-temperature hot-air after the mixing temperature adjustment from wind mixed chamber out, through one group of cyclonic separator, carry out dry method dust, hot blast after further purifying enters spray-drier, as the thermal source of liquid poly aluminium chloride drying;

5) the spray-drier hot blast purifies and vent gas treatment: after high-temperature hot-air enters spray-drier, heat in hot blast, sulfurous gas and a small amount of dust are atomized into very tiny poly aluminium chloride drop absorption cleaning, from spray-drier low temperature hot blast out, enter the acid mist recovery tower, water with atomization in the acid mist recovery tower reclaims contained a small amount of poly aluminium chloride dust in hot blast, and further reduce the temperature of hot blast, then it is entered to atmosphere, entering sulfurous gas and dust content in the low temperature hot blast of atmosphere is zero, the hot water that the acid mist recovery tower reclaims, be back to the production of liquid poly aluminium chloride.

Embodiment 1:

With 6000kcal/kg, the common bituminous coal of sulphur content 2% is fuel, per hour require to produce 3.5 tons of poly aluminium chlorides (amounting to solid phase prod), comprise that the yellow product of technical grade per hour produces 2.0 tons of (1.5 tons of product roller dryer dryings wherein, as liquid product, sell for other 0.5 ton, do not need drying) and the light yellow poly aluminium chloride of tap water level per hour produce 1.5 tons, tap water level product spray-drier drying, technical grade poly aluminium chloride liquid oxidation aluminium content is 10%, basicity is 95%, tap water level poly aluminium chloride liquid oxidation aluminium content is 14.0%, basicity is 75%.This total heat capacity in system combustion chamber is 5,300,000 kcal/ hour, the dry heat supplied needed of roller dryer is 2,000,000 kcal/ hour, the heat supplied of liquid poly aluminium chloride need of production is 1,000,000 kcal/ hour, the heat supplied that spray-drier needs is 1,900,000 kcal/ hour, thermosteresis 400,000 kcal/ hour, total heat utilization efficiency is 92.5%, production process per hour consumes coal 884kg, wherein the dry coal consumption of roller dryer is ton product 222kg, the dry coal consumption of spray-drier is ton product 211kg, bituminous coal combustion produces sulphur content and is 17.7kg per hour, the poly aluminium chloride product of all being produced by spray-drier absorbs, in product, sulphur content is ton product 11.8kg, account for 1.18%, form with calcium sulfite is present in product, can not affect quality product.

Embodiment 2:

With 4500kcal/kg, the bituminous coal of sulphur content 4% is fuel, per hour require to produce 3.5 tons of poly aluminium chlorides (amounting to solid phase prod), comprise that the yellow product of technical grade per hour produces 2.0 tons of (1.5 tons of product roller dryer dryings wherein, as liquid product, sell for other 0.5 ton, do not need drying) and high-purity grade of white products per hour produce 1.5 tons, high-purity poly aluminium chloride spray-drier drying, technical grade poly aluminium chloride liquid oxidation aluminium content is 10%, basicity is 95%, high-purity poly aluminium chloride liquid oxidation aluminium content is 18.0%, and basicity is 48%.This total heat capacity in system combustion chamber is 5,300,000 kcal/ hour, reality is 5,200,000 kcal/ hour by heat, the dry heat supplied needed of roller dryer is 2,000,000 kcal/ hour, the heat supplied of liquid poly aluminium chloride need of production is 1,100,000 kcal/ hour, the heat supplied that spray-drier needs is 1,700,000 kcal/ hour, thermosteresis 400,000 kcal/ hour, total heat utilization efficiency is 92.3%, production process per hour consumes coal 1156kg, wherein the dry coal consumption of roller dryer is ton product 296.3kg, the dry coal consumption of spray-drier is ton product 251.9kg, bituminous coal combustion produces sulphur content and is 46.3kg per hour, the poly aluminium chloride product of all being produced by spray-drier absorbs, in product, sulphur content is ton product 30.9kg, account for 3.1%, form with Tai-Ace S 150 is present in product, can not affect quality product.

Embodiment 3:

With 5000kcal/kg, the bituminous coal of sulphur content 1% is fuel, per hour require to produce 3.5 tons of poly aluminium chlorides (amounting to solid phase prod), comprise that the light yellow product of technical grade per hour produces 2.0 tons of (1.5 tons of product roller dryer dryings wherein, as liquid product, sell for other 0.5 ton, do not need drying) and high-purity grade of white products per hour produce 1.5 tons, high-purity poly aluminium chloride spray-drier drying, technical grade poly aluminium chloride liquid oxidation aluminium content is 12%, basicity is 89%, high-purity poly aluminium chloride liquid oxidation aluminium content is 18.5%, and basicity is 45%.This total heat capacity in system combustion chamber is 5,300,000 kcal/ hour, reality is 5,100,000 kcal/ hour by heat, the dry heat supplied needed of roller dryer is 1,950,000 kcal/ hour, the heat supplied of liquid poly aluminium chloride need of production is 1,100,000 kcal/ hour, the heat supplied that spray-drier needs is 1,650,000 kcal/ hour, thermosteresis 400,000 kcal/ hour, total heat utilization efficiency is 92.2%, production process per hour consumes coal 1020kg, wherein the dry coal consumption of roller dryer is ton product 260kg, the dry coal consumption of spray-drier is ton product 220kg, bituminous coal combustion produces sulphur content and is 10.2kg per hour, the poly aluminium chloride product of all being produced by spray-drier absorbs, in product, sulphur content is ton product 6.8kg, account for 0.7%, form with Tai-Ace S 150 is present in product, can not affect quality product.

The invention provides multiple cleaning heat source can 4500-7000kcal/kg for the method for preparing poly aluminium chloride, the common bituminous coal of sulphur content 0-4% acts as a fuel, the poly aluminium chloride raw materials can be used aluminum-containing raw material and the hydrochloric acid such as bauxitic clay, calcium aluminate, aluminium hydroxide and sodium aluminate, produces product and comprises technical grade poly aluminium chloride, tap water level poly aluminium chloride and high-purity grade of white poly aluminium chloride etc.; The cleaning heat source that produces comprises three kinds of high temperature heat conductive oil, high-temperature steam and high-temperature hot-airs etc., and coal-fired total heat utilization efficiency reaches more than 90%; Flue gas adopts final dusting, and dedusting for the first time, in the high temperature purification chamber, is adopted the method for baffling dedusting, and after dedusting, smoke content is less than 80mg/m 3, dedusting for the second time, after wind mixed chamber, is adopted the method for cyclonic separation dedusting, and after dedusting, smoke content is less than 40mg/m 3Flue gas desulfurization, in spray-drier, absorbs with the liquid poly aluminium chloride of atomization, and desulfuration efficiency reaches 100%, and the sulphur after desulfurization is present in the poly aluminium chloride solid phase prod with compound form; From spray-drier low temperature hot blast out, contain a small amount of dust and sour gas, with acid mist recovery tower atomization cold water spray-absorption, the hot blast temperature that enters atmosphere is less than 50 ℃, and sulfurous gas and dust content are zero.The present invention is not limited by poly aluminium chloride raw materials for production, production kind and industrial scale, is suitable for promoting the use of.

Claims (4)

1. one kind provides multiple cleaning heat source for the method for preparing poly aluminium chloride simultaneously, it is characterized in that: comprise the following steps:
1) prepare clean high-temperature hot-air: coal-fired high-temperature hot-air 600-900 ℃ of coal burning machine combustion chambers burn generation, burner blower is delivered to the high temperature purification chamber by hot blast and is purified, after purification, by three high-temperature gate valves, control the exhaust gas volumn of leading to heat-condutive oil heat exchanger, vapour generator and wind mixed chamber respectively, guarantee the properly distributed of high-temperature flue gas;
2) heat-condutive oil heat exchanger heat supply: come the high-temperature hot-air of Self-air-heating decontamination chamber and the interior thermal oil of heat-condutive oil heat exchanger heating chamber boiler tube to carry out heat exchange, the heating thermal oil, high temperature heat conductive oil after heating, as the roller dryer thermal source, from roller dryer low temperature deep fat out, return to the heat-condutive oil heat exchanger heating chamber, then carry out heat exchange with high-temperature hot-air, recycle; Low temperature hot blast after heat exchange, through air inducing power traction back-mixing air compartment, carries out second stage employ;
3) vapour generator heat supply: come the high-temperature hot-air of Self-air-heating decontamination chamber and the interior water of vapour generator heating chamber boiler tube to carry out heat exchange, water is heated into to steam, for the liquid poly aluminium chloride, produce, the low temperature hot blast after heat exchange, through air inducing power traction back-mixing air compartment, carries out second stage employ;
4) spray-drier heat supply: the high-temperature hot-air that comes the Self-air-heating decontamination chamber respectively with low temperature hot blast from heat-condutive oil heat exchanger, from the low temperature hot blast of vapour generator with mix in wind mixed chamber from the normal temperature air in atmosphere, high-temperature hot-air after the mixing temperature adjustment from wind mixed chamber out, through one group of cyclonic separator, carry out dry method dust, hot blast after further purifying enters spray-drier, as the thermal source of liquid poly aluminium chloride drying;
5) the spray-drier hot blast purifies and vent gas treatment: after high-temperature hot-air enters spray-drier, heat in hot blast, sulfurous gas and a small amount of dust are atomized into very tiny poly aluminium chloride drop absorption cleaning, from spray-drier low temperature hot blast out, enter the acid mist recovery tower, water with atomization in the acid mist recovery tower reclaims contained a small amount of poly aluminium chloride dust in hot blast, and further reduce the temperature of hot blast, then it is entered to atmosphere, entering sulfurous gas and dust content in the low temperature hot blast of atmosphere is zero, the hot water that the acid mist recovery tower reclaims, be back to the production of liquid poly aluminium chloride.
2. according to claim 1ly provide simultaneously multiple cleaning heat source for the method for preparing poly aluminium chloride, it is characterized in that: above-mentioned steps 2) heat-condutive oil heat exchanger is for hankering: the high-temperature hot-air that the coal burning machine combustion chamber produces enters the purification hot air chamber after the dedusting of high temperature purification chamber, then by high-temperature gate valve, guide to the heat-condutive oil heat exchanger heating chamber, with thermal oil in boiler tube, carry out heat exchange, by heat-conducting oil heating to 350 ℃.
3. according to claim 1 and 2ly provide simultaneously multiple cleaning heat source for the method for preparing poly aluminium chloride, it is characterized in that: above-mentioned steps 3) vapour generator is for hankering: it is the high-temperature steam of 180 ℃ that the water of vapour generator is heated to form temperature, the thermal source that this steam is produced as the liquid poly aluminium chloride.
4. the device of multiple cleaning heat source for the method for preparing poly aluminium chloride that provide simultaneously claimed in claim 1 is provided, it is characterized in that: coal burning machine (1) is connected with high temperature purification chamber (2), described high temperature purification chamber (2) is connected with and purifies hot air chamber (3), described purification hot air chamber (3) is connected with vapour generator (5) by the first valve (8), the vapour pipe of described vapour generator (5) is connected with steam and divides drum (4), the hot blast end of described vapour generator (5) adopts the first induced draft fan (6) to be connected with wind mixed chamber (7), described purification hot air chamber (3) connects described wind mixed chamber (7) by second valve (9), described wind mixed chamber (7) is provided with air intlet (29), described purification hot air chamber (3) is connected with the air intake of heat-condutive oil heat exchanger (11) by the 3rd valve (10), the outlet air end of described heat-condutive oil heat exchanger (11) is connected with described wind mixed chamber (7) by the second induced draft fan (12), described wind mixed chamber (7) is connected with the air intake of spray-drier (14) by tornado dust collector (13), the outlet air end of described spray-drier (14) is connected with the first acid mist recovery tower (15), the air outlet of described the first acid mist recovery tower (15) is connected with the first chimney (18) by the 3rd induced draft fan (17), the drain side of described the first acid mist recovery tower (15) is connected with the first recycle pump (16), the outlet of described the first recycle pump (16) is connected with poly-aluminium liquid workshop with described the first acid mist recovery tower (15) respectively, the deep fat end of described heat-condutive oil heat exchanger (11) is connected with the heat exchange entrance end of roller dryer (26), the heat exchange exit end of described roller dryer (26) is connected with thermal oil return tank (27), described thermal oil return tank (27) is connected with the cold oil end of described heat-condutive oil heat exchanger (11) by thermal oil transferpump (28), the air outlet of described roller dryer (26) is connected with the second acid mist recovery tower (25), the air outlet of described the second acid mist recovery tower (25) is connected with the second chimney (22) by the 4th induced draft fan (23), the drain side of described the second acid mist recovery tower (25) is connected with the second recycle pump (24), the outlet of described the second recycle pump (24) is connected with poly-aluminium liquid workshop with described the second acid mist recovery tower (25) respectively.
CN2012103578245A 2012-09-24 2012-09-24 Method and device capable of simultaneously providing various cleheat sources to prepare polyaluminum chloride CN102849769B (en)

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CN103193305B (en) * 2013-04-15 2014-06-04 长沙理工大学 Drying production method and device thereof for polyaluminium chloride water purifying agent
CN103708516B (en) * 2013-12-23 2015-01-07 长沙理工大学 High-efficiency and energy-saving spray-drying and automatic-packaging production method for powdery polyaluminum chloride
CN104743588B (en) * 2013-12-31 2017-10-20 重庆蓝洁广顺净水材料有限公司 The solid polyaluminium chloride process units of environment-protecting clean
CN104743591B (en) * 2013-12-31 2017-10-31 重庆蓝洁广顺净水材料有限公司 A kind of solid polyaluminium chloride energy-conserving and environment-protective production system of use heat conducting oil type roller drying
CN103868056B (en) * 2014-03-21 2016-09-07 中化云龙有限公司 Utilize the method that fired coal combustion obtains clean high-temperature hot flue gas
CN109019650A (en) * 2018-09-30 2018-12-18 上海高桥大同净水材料有限公司 A kind of production method and production system of high-purity polyaluminium chloride
CN109990460A (en) * 2019-04-08 2019-07-09 东莞市天伟节能环保技术有限公司 A kind of circulating heat supply system and its heat supply method

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