CN115671910A - High-temperature flue gas purification device of cement burning clinker cooling machine and cement production system - Google Patents
High-temperature flue gas purification device of cement burning clinker cooling machine and cement production system Download PDFInfo
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- CN115671910A CN115671910A CN202210768622.3A CN202210768622A CN115671910A CN 115671910 A CN115671910 A CN 115671910A CN 202210768622 A CN202210768622 A CN 202210768622A CN 115671910 A CN115671910 A CN 115671910A
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- 239000003546 flue gas Substances 0.000 title claims abstract description 424
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 423
- 239000004568 cement Substances 0.000 title claims abstract description 111
- 238000000746 purification Methods 0.000 title claims abstract description 89
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 46
- 238000001816 cooling Methods 0.000 title claims abstract description 31
- 239000000428 dust Substances 0.000 claims abstract description 245
- 238000001914 filtration Methods 0.000 claims abstract description 140
- 239000002918 waste heat Substances 0.000 claims abstract description 98
- 239000007789 gas Substances 0.000 claims abstract description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 238000010304 firing Methods 0.000 claims abstract description 19
- 239000000843 powder Substances 0.000 claims description 48
- 239000011148 porous material Substances 0.000 claims description 21
- 235000012054 meals Nutrition 0.000 claims description 19
- 239000003054 catalyst Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 18
- 239000003638 chemical reducing agent Substances 0.000 claims description 15
- 239000012528 membrane Substances 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 7
- 239000000779 smoke Substances 0.000 claims description 7
- 238000001354 calcination Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 210000001503 joint Anatomy 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 description 16
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 14
- 239000004744 fabric Substances 0.000 description 6
- 239000003517 fume Substances 0.000 description 6
- 231100000572 poisoning Toxicity 0.000 description 4
- 230000000607 poisoning effect Effects 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 238000004887 air purification Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 238000010926 purge Methods 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The invention discloses a high-temperature flue gas purification device of a cement burning clinker cooling machine and a cement production system, and aims to solve the technical problems that the energy and water resources are greatly consumed and the heat of high-temperature flue gas is not utilized in the existing purification process of the high-temperature flue gas of the cement burning clinker cooling machine. High temperature flue gas purification device of cement clinker firing cooler includes: the gas filtering dust remover unit is used for receiving the high-temperature flue gas output by the cooler, physically intercepting dust in the high-temperature flue gas through a high-temperature resistant filter element, and outputting the dedusted flue gas with the temperature of 250-00 ℃ and preferably 300-500 ℃; and the waste heat boiler unit is used for receiving the denitrated flue gas and the first feed water, exchanging heat and then respectively outputting water vapor and cooled flue gas.
Description
Technical Field
The invention relates to the field of cement production, in particular to a high-temperature flue gas purification device of a cement raw material mill, a high-temperature flue gas purification device of a cement firing clinker cooling machine and a cement production system.
Background
The existing cement production system comprises three major parts, namely a raw material production section, a clinker production section and a finished product production section, wherein the three major parts all generate smoke, the smoke contains a large amount of dust, and some smoke also contains high-concentration nitric oxide, so that the smoke needs to be purified and then can be discharged. Specifically, the raw meal production section comprises a raw meal mill for receiving cement production raw materials and high temperature gas from a cyclone preheater and outputting first flue gas, which enters a homogenizer via first powder recovered by a first dust collector. And the clinker production section comprises a burnt clinker cooler, the burnt clinker cooler is used for receiving burnt clinker from the calcining equipment, cooling the burnt clinker by using air and outputting second flue gas, and the second flue gas enters a clinker warehouse through second powder recovered by a second dust collector. And the finished product production section comprises a powder concentrator, the powder concentrator is used for receiving powder from the ball mill and outputting third flue gas containing the sorted fine powder, and the third flue gas enters a finished product warehouse through third powder recycled by a third dust collector.
For the purification of the first flue gas, there are two processes. The first process is that the first fume is first introduced into the humidifying tower, the humidifying tower sprays water to cool the high temperature fume, and outputs wet low temperature gas at 100-120 deg.c, and the wet low temperature gas is then filtered in the first dust collector, the first powder after being filtered and dedusted is finally discharged in the homogenizer. The main drawbacks of the first process described above are: a large amount of water is needed for spraying and cooling, so that the consumption of energy and water resources is high; the heat in the first flue gas is not utilized; the content of the nitrogen oxide in the first flue gas is higher, so that the emission of the nitrogen oxide in the dedusted flue gas does not reach the standard; the cloth bag dust collector has poor filtering efficiency and the dust emission is easy to exceed the standard. The second process is that the first fume is first denitrated in SCR reactor and then fed into the humidifying tower, the wet low temperature gas from the humidifying tower is then fed into the cloth bag dust collector for filtering and dedusting, the first powder after filtering and dedusting is fed into the homogenizer, and the dedusted fume is exhausted. Compared with the first process, the second process only solves the denitration problem, but brings about derivative problems of easy poisoning, blockage and the like of the SCR catalyst, and the denitration efficiency is low, and the normal operation of purification is influenced.
For the purification of the second flue gas, the existing process is similar to the aforementioned first process, and therefore the following disadvantages still exist: a large amount of water is needed for spraying and cooling, so that the consumption of energy and water resources is high; the heat in the second flue gas is not utilized; the cloth bag dust collector has poor filtering efficiency and the dust emission is easy to exceed the standard.
Disclosure of Invention
The invention aims to provide a high-temperature flue gas purification device of a cement raw meal mill, a high-temperature flue gas purification device of a cement burning clinker cooling machine and a cement production system, and aims to solve the technical problems that the consumption of energy and water resources is high and the heat of high-temperature flue gas is not utilized in the existing purification process of the high-temperature flue gas of the cement raw meal mill or the high-temperature flue gas of the cement burning clinker cooling machine.
In a first aspect, a high-temperature flue gas purification device for a cement raw mill is provided, which comprises: the flue gas filtering dust remover unit is used for receiving the high-temperature flue gas output by the raw material mill, physically intercepting dust in the high-temperature flue gas through a high-temperature resistant filter element and outputting the dedusted flue gas with the temperature of 250-400 ℃; the SCR denitration reactor unit is used for receiving the dedusted flue gas added with the SCR denitration reducing agent, passing through an SCR denitration catalyst and outputting the denitrated flue gas; the waste heat boiler unit is used for receiving the denitrated flue gas and the feed water, exchanging heat and then respectively outputting water vapor and cooled flue gas; and the SCR denitration reducing agent output pipeline unit is used for adding the SCR denitration reducing agent into the conveying channel of the high-temperature flue gas and/or the conveying channel of the dedusted flue gas.
According to an embodiment of the present invention, in the high temperature flue gas purification apparatus for cement raw mill of the first aspect, the high temperature resistant filter element is a filter bag, the filter bag comprises a metal filter membrane, the metal filter membrane is rolled into a tubular structure, the upper end of the tubular structure is provided with a connector, and the lower end of the tubular structure is sealed by a bottom cover, the connector is used for installing the filter bag in the flue gas filter dust collector unit.
According to an embodiment of the present invention, in the high temperature flue gas purification apparatus for cement raw mill according to the first aspect, the flue gas filtering dust remover of the flue gas filtering dust remover unit includes a filter housing, an ash bucket is disposed at a lower portion of the filter housing, an ash discharge device is connected to a bottom of the ash bucket, a pore plate is disposed in the filter housing, a high temperature resistant filter element is mounted on the pore plate, the pore plate and the high temperature resistant filter element separate the filter housing into a lower raw gas chamber and an upper clean gas chamber, the high temperature resistant filter element is located in the lower raw gas chamber, and the SCR denitration reducing agent output pipeline unit is disposed in the upper clean gas chamber.
According to an embodiment of the present invention, in the high temperature flue gas purification apparatus for a cement raw mill of the first aspect, the heat exchange tubes in the waste heat boiler unit are fin heat exchange tubes.
According to an embodiment of the present invention, in the high-temperature flue gas purification apparatus for a cement raw mill according to the first aspect, the SCR denitration reactor unit is assembled on the flue gas filter dust collector unit to form a dust removal and denitration integrated device.
According to an embodiment of the present invention, in the high-temperature flue gas purification apparatus for a cement raw mill according to the first aspect, the exhaust-heat boiler unit is assembled on the dust removal and denitration integrated apparatus to form a dust removal, denitration and heat exchange integrated apparatus.
According to an embodiment of the present invention, in the high temperature flue gas purification apparatus for cement raw meal mill of the first aspect, the flue gas filtering dust collector of the flue gas filtering dust collector unit comprises a filter housing, the lower part of the filter housing is provided with an ash bucket, the bottom of the ash bucket is connected with an ash discharging device, a pore plate is arranged in the filter housing, a high temperature resistant filter element is arranged on the pore plate, the pore plate and the high temperature resistant filter element divide the filter housing into a lower raw gas chamber and an upper clean gas chamber, and the high temperature resistant filter element is located in the lower raw gas chamber; the SCR denitration reactor unit comprises a reactor shell, the reactor shell is used for installing the SCR denitration catalyst, the reactor shell and the filter shell are connected into a whole, and the reactor shell is communicated with the upper air purification chamber and is formed by the shell of the upper air purification chamber or is positioned at the top and/or the side part of the upper air purification chamber.
According to an embodiment of the present invention, in the high-temperature flue gas purification apparatus for a cement raw mill according to the first aspect, when the exhaust-heat boiler unit is assembled on the dust removal and denitration integrated device, the flue of the exhaust-heat boiler unit is vertically or horizontally arranged and is located at the top and/or the side of the reactor housing.
According to an embodiment of the present invention, in the high temperature flue gas purification apparatus for cement raw mill of the first aspect, the flue gas filtering and dust removing unit includes a left flue gas filtering and dust removing device and a right flue gas filtering and dust removing device which are arranged side by side in the left-right direction, the left flue gas filtering and dust removing device and the right flue gas filtering and dust removing device are respectively provided with at least one flue gas filtering and dust removing device which is arranged in the front-back direction, an air inlet main flue is arranged between the left flue gas filtering and dust removing device and the right flue gas filtering and dust removing device, and the air inlet main flue is respectively communicated with a lower original air chamber of each flue gas filtering and dust removing device in the flue gas filtering and dust removing unit; the length of the tube bundle in the waste heat boiler unit and the left-right width of the smoke filtering dust remover unit are arranged in the same direction.
In a second aspect, there is provided a cement production system comprising: a raw meal production section comprising a raw meal mill for receiving cement production raw materials and high temperature gas from a cyclone preheater and outputting first flue gas, the first flue gas being fed to a homogenizer from first powder recovered by a first dust collector; the clinker production section comprises a burnt clinker cooler, the burnt clinker cooler is used for receiving burnt clinker from the calcining equipment, cooling the burnt clinker by air and outputting second flue gas, and the second flue gas enters a clinker warehouse through second powder recovered by a second dust collector; a finished product production section, wherein the finished product production section comprises a powder concentrator, the powder concentrator is used for receiving powder from the ball mill and outputting third flue gas containing the sorted fine powder, and the third flue gas enters a finished product warehouse through third powder recycled by a third dust collector; the first dust collector adopts the high-temperature flue gas purification device of the cement raw mill in the first aspect, wherein the first flue gas is taken as the high-temperature flue gas output by the raw mill and enters the high-temperature flue gas purification device of the cement raw mill, the dust filtered by the flue gas filtering and dust removing unit of the high-temperature flue gas purification device of the cement raw mill enters the homogenizer as the first powder, and the cooled flue gas is discharged.
According to the high-temperature flue gas purification device for the cement raw material mill, the high-temperature flue gas output by the raw material mill is firstly filtered, dedusted and purified through the flue gas filtering deduster unit, then is adjusted to be dedusted, and is denitrated through the SC R denitration reactor unit to obtain denitrated flue gas, and finally is adjusted to be cooled through the waste heat boiler unit.
The output temperature of the flue gas filtering dust remover unit is 250-400 ℃, and the temperature range does not influence the service life of a high-temperature resistant filter element in the flue gas filtering dust remover unit; meanwhile, the temperature of the dedusted flue gas can be kept within a better use temperature range of the mature high-temperature SCR denitration catalyst in the prior art so as to ensure the denitration effect. In addition, dust removal is carried out before denitration, so that the SCR denitration catalyst can be prevented from being blocked by dust, and the catalyst poisoning is prevented.
Can fully retrieve the advantage to the heat of high temperature flue gas through exhaust-heat boiler unit, especially get into the denitration flue gas dust content of exhaust-heat boiler unit little, consequently, the heat exchange efficiency between the tube bank among denitration flue gas and the exhaust-heat boiler unit is higher, so can promote exhaust-heat boiler unit's heat exchange efficiency to reduce the influence of dust to exhaust-heat boiler unit.
In a third aspect, a high-temperature flue gas purification device of a cement burning clinker cooler is provided, which comprises: the gas filtering dust remover unit is used for receiving the high-temperature flue gas output by the cooler, physically intercepting dust in the high-temperature flue gas through a high-temperature resistant filter element, and then outputting the dedusted flue gas with the temperature of 250-00 ℃ and preferably 300-500 ℃; and the waste heat boiler unit is used for receiving the denitrated flue gas and the first feed water, exchanging heat and then respectively outputting water vapor and cooled flue gas.
According to an embodiment of the present invention, the high temperature flue gas purification apparatus of a cement clinker burning cooler in the third aspect further includes a feed water preheating unit, configured to receive the high temperature dust and the second feed water discharged by the flue gas filter dust collector unit, and heat the second feed water by the high temperature dust, so as to output the first feed water heated by the second feed water.
According to an embodiment of the invention, in the high-temperature flue gas purification device of the cement clinker firing cooler in the third aspect, the high-temperature resistant filter element is a filter bag, the filter bag comprises a metal filter membrane, the metal filter membrane is rolled into a tubular structure, the upper end of the tubular structure is provided with a joint, the lower end of the tubular structure is sealed by a bottom cover, and the joint is used for installing the filter bag in the flue gas filtering dust collector unit.
According to an embodiment of the present invention, in the high temperature flue gas purification apparatus for a cement clinker firing cooler in the third aspect, the flue gas filtering dust collector of the flue gas filtering dust collector unit includes a filter housing, an ash bucket is disposed at a lower portion of the filter housing, an ash discharging device is connected to a bottom of the ash bucket, a pore plate is disposed in the filter housing, a high temperature resistant filter element is mounted on the pore plate, the pore plate and the high temperature resistant filter element divide the filter housing into a lower raw gas chamber and an upper clean gas chamber, and the high temperature resistant filter element is located in the lower raw gas chamber.
According to an embodiment of the present invention, the high temperature flue gas purification apparatus of a cement burning clinker cooler in the third aspect further includes a pre-heat recovery boiler unit, configured to receive the high temperature flue gas output by the cooler and third feed water, perform heat exchange, and output water vapor and the cooled high temperature flue gas respectively; the flue gas filtering dust remover unit is used for receiving the high-temperature flue gas output by the preposed waste heat boiler unit, physically intercepting dust in the high-temperature flue gas through a high-temperature resistant filter element and outputting the dedusted flue gas with the temperature of 250-500 ℃.
According to an embodiment of the present invention, in the high-temperature flue gas purification apparatus of a cement clinker firing cooler in the third aspect, a casing constituting a flue of the waste heat boiler unit and a casing constituting a flue of the pre-heat waste boiler unit are assembled with each other to make the waste heat boiler unit and the pre-heat waste boiler unit become an integrated heat exchange device, and a gas supply flue and a return flue are distributed around the integrated heat exchange device; the flue gas filters the dust remover unit and arranges integral type indirect heating equipment's side, integral type indirect heating equipment passes through the flue of supplying gas will the gas vent of leading exhaust-heat boiler unit's flue with the air inlet of flue gas filters the dust remover unit is connected, integral type indirect heating equipment passes through the return flow flue will the gas inlet of exhaust-heat boiler unit's flue with the gas vent of flue gas filtration dust remover unit is connected.
According to an embodiment of the present invention, in the high-temperature flue gas purification apparatus of a cement clinker firing cooler in the third aspect, a flue of the front-mounted waste heat boiler unit is arranged in a vertical direction, an air inlet and an air outlet of the front-mounted waste heat boiler unit are distributed at a lower part and an upper part of the flue of the front-mounted waste heat boiler unit, an ash bucket is arranged at a lower part of the flue of the front-mounted waste heat boiler unit, and an ash unloading mechanism is connected to a bottom of the ash bucket; the flue of the waste heat boiler unit is arranged in a vertical direction, and the air inlet and the air outlet of the waste heat boiler unit are distributed at the upper part and the lower part of the flue of the waste heat boiler unit; and an exhaust port of a flue of the front waste heat boiler unit is in butt joint with an air inlet of a flue of the waste heat boiler unit, so that the front waste heat boiler unit and the waste heat boiler unit form an inverted U-shaped structure.
According to an embodiment of the present invention, in the high-temperature flue gas purification apparatus for a cement clinker firing cooler in the third aspect, the preposed waste heat boiler unit and at least a heat exchange tube in the waste heat boiler unit adopt a fin heat exchange tube, and when the heat exchange tube in the preposed waste heat boiler unit does not adopt a fin heat exchange tube, a smooth surface heat exchange tube is adopted.
According to an embodiment of the present invention, in the high temperature flue gas purification apparatus of the cement clinker firing cooler in the third aspect, the front waste heat boiler unit includes a first superheater, a first evaporator and a first economizer which are sequentially arranged from front to back along a flue of the front waste heat boiler unit; the waste heat boiler unit comprises a second evaporator and a second economizer which are sequentially arranged from front to back along a flue of the waste heat boiler unit; and a steam outlet of the steam drum correspondingly connected with the second evaporator is connected to a steam inlet of the first superheater through a steam conveying pipeline.
According to an embodiment of the present invention, in the high temperature flue gas purification apparatus for a cement clinker firing cooler in the third aspect, the exhaust-heat boiler unit is assembled on the flue gas filtering dust collector unit to form a dust-removing and heat-exchanging integrated device.
According to an embodiment of the present invention, in the high-temperature flue gas purification apparatus of the cement clinker firing cooler in the third aspect, a flue gas filtering dust collector of the flue gas filtering dust collector unit includes a filter housing, an ash bucket is disposed at a lower portion of the filter housing, an ash discharging device is connected to a bottom of the ash bucket, a pore plate is disposed in the filter housing, a high-temperature resistant filter element is mounted on the pore plate, the pore plate and the high-temperature resistant filter element separate the filter housing into a lower raw gas chamber and an upper clean gas chamber, and the high-temperature resistant filter element is located in the lower raw gas chamber; and the flue of the waste heat boiler unit is vertically or transversely arranged and is positioned at the top and/or the side of the filter shell.
According to an embodiment of the present invention, in the high-temperature flue gas purification apparatus for a cement clinker firing cooler of the third aspect, the flue gas filtering and dust removing unit includes a left flue gas filtering and dust removing device and a right flue gas filtering and dust removing device which are arranged side by side in the left-right direction, the left flue gas filtering and dust removing device and the right flue gas filtering and dust removing device each have at least one flue gas filtering and dust removing device arranged in the front-back direction, an air inlet main flue is arranged between the left flue gas filtering and dust removing device and the right flue gas filtering and dust removing device, and the air inlet main flue is respectively communicated with lower original gas chambers of the flue gas filtering and dust removing devices in the flue gas filtering and dust removing unit; the length of the tube bundle in the waste heat boiler unit and the left-right width of the smoke filtering dust remover unit are arranged in the same direction.
In a fourth aspect, there is provided a cement production system comprising: a raw meal production section comprising a raw meal mill for receiving cement production raw materials and high temperature gas from a cyclone preheater and outputting first flue gas, the first flue gas being fed to a homogenizer from first powder recovered by a first dust collector; the clinker production section comprises a burnt clinker cooler, the burnt clinker cooler is used for receiving burnt clinker from the calcining equipment, cooling the burnt clinker by air and outputting second flue gas, and the second flue gas enters a clinker warehouse through second powder recovered by a second dust collector; a finished product production section, wherein the finished product production section comprises a powder concentrator, the powder concentrator is used for receiving powder from the ball mill and outputting third flue gas containing the sorted fine powder, and the third flue gas enters a finished product warehouse through third powder recycled by a third dust collector; the second dust collector adopts the high-temperature flue gas purification device of the cement burning clinker cooling machine in the third aspect, wherein the second flue gas enters the high-temperature flue gas purification device of the cement burning clinker cooling machine as the high-temperature flue gas output by the cooling machine, the dust filtered by the flue gas filtering and dust removing unit of the high-temperature flue gas purification device of the cement burning clinker cooling machine enters the clinker storage as second powder, and the cooled flue gas is discharged.
According to an embodiment of the present invention, in the cement production system of the fourth aspect, the first dust collector adopts a high temperature flue gas purification device for a cement raw mill, and the high temperature flue gas purification device for the cement raw mill comprises: the flue gas filtering dust remover unit is used for receiving the high-temperature flue gas output by the raw material mill, physically intercepting dust in the high-temperature flue gas through a high-temperature resistant filter element and outputting the dedusted flue gas with the temperature of 250-400 ℃; the SCR denitration reactor unit is used for receiving the dedusted flue gas added with the SCR denitration reducing agent, passing through an SCR denitration catalyst and outputting the denitrated flue gas; the waste heat boiler unit is used for receiving the denitrated flue gas and the feed water, exchanging heat and then respectively outputting water vapor and cooled flue gas; the SCR denitration reducing agent output pipeline unit is used for adding the SCR denitration reducing agent into the conveying channel of the high-temperature flue gas and/or the conveying channel of the dedusted flue gas; the first flue gas is used as high-temperature flue gas output by the raw mill and enters a high-temperature flue gas purification device of the cement raw mill, dust filtered by a flue gas filtering dust collector unit of the high-temperature flue gas purification device of the cement raw mill enters a homogenizer as first powder, and the cooled flue gas is discharged.
According to an embodiment of the present invention, in the cement production system according to the fourth aspect, in the high-temperature flue gas purification apparatus for a cement raw mill, the SCR denitration reactor unit is assembled on the flue gas filter dust remover unit to form a dust removal and denitration integrated device, and the exhaust-heat boiler unit is assembled on the dust removal and denitration integrated device to form a dust removal, denitration and heat exchange integrated device.
The high-temperature flue gas purification device of the cement burning clinker cooling machine firstly filters, removes dust and purifies high-temperature flue gas output by the cement burning clinker cooling machine through the flue gas filtering and dust removing unit, then adjusts the high-temperature flue gas into dust-removed flue gas, and then adjusts the dust-removed flue gas into cooled flue gas through the waste heat boiler unit.
The output temperature of the flue gas filtering dust remover unit is 250-500 ℃, and the temperature range does not influence the service life of a high-temperature resistant filter element in the flue gas filtering dust remover unit. Can fully retrieve the advantage to the heat of high temperature flue gas through exhaust-heat boiler unit, especially get into the denitration flue gas dust content of exhaust-heat boiler unit little, consequently, the heat exchange efficiency between the tube bank among denitration flue gas and the exhaust-heat boiler unit is higher, so can promote exhaust-heat boiler unit's heat exchange efficiency to reduce the influence of dust to exhaust-heat boiler unit.
The present application is further described with reference to the following drawings and detailed description. Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to assist in understanding the present application and are included to explain the present application and not to limit the application unduly.
FIG. 1 is a schematic structural diagram of a high-temperature flue gas purification device of a cement raw mill according to an embodiment of the present invention.
FIG. 2 is a schematic view of a high-temperature flue gas purification device of a cement clinker burning cooler according to an embodiment of the present invention.
FIG. 3 is a schematic structural view of a high-temperature flue gas purification device of a cement raw mill in an embodiment of the present invention.
Fig. 4 is a left side view of the high temperature flue gas cleaning apparatus of the cement raw mill shown in fig. 3.
FIG. 5 is a schematic structural view of a high-temperature flue gas purification device of a cement raw mill in an embodiment of the present invention.
Fig. 6 is a schematic structural view of a high-temperature flue gas purification device of a cement raw mill in an embodiment of the invention.
FIG. 7 is a schematic view of a partial structure of a high-temperature flue gas purification device of a cement clinker cooling machine according to an embodiment of the present invention.
The direction indicated by the hollow arrows in fig. 3-7 indicates the direction of flow of the flue gas.
Detailed Description
The present application will now be described more fully hereinafter with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the present application based on these teachings. Before describing the present application in conjunction with the drawings, it is noted that:
the technical solutions and features provided in the respective sections including the following description may be combined with each other without conflict. Furthermore, where possible, these technical solutions, technical features and related combinations may be given specific technical subject matter and are protected by the accompanying patent.
The embodiments of the application referred to in the following description are generally only some embodiments, rather than all embodiments, on the basis of which all other embodiments that can be derived by a person skilled in the art without inventive step should be considered within the scope of patent protection.
With respect to the terms and units in this specification: the terms "comprising," "including," "having," and any variations thereof in this specification and in the claims and following claims are intended to cover non-exclusive inclusions. In addition, other related terms and units can be reasonably construed based on the description to provide related contents. The terms "front", "rear", "left" and "right" in this specification and the corresponding claims and the related portions indicate relative positional relationships based on the drawings. In addition, other related terms and units can be reasonably construed based on the description to provide related contents.
As shown in fig. 1-2, the existing cement production system comprises a raw meal production section and a clinker production section, wherein the raw meal production section comprises a raw meal mill 12, the raw meal mill 12 is configured to receive raw cement production materials and hot gas from a cyclone preheater 21 and output first flue gas, and the first flue gas enters a homogenizer 16 through first powder recovered by a first dust collector. The clinker production section comprises a burnt clinker cooler 29 (usually a grate cooler), the burnt clinker cooler 29 is used for receiving the burnt clinker from the calcining equipment 22 (usually a rotary kiln), cooling the burnt clinker by air and outputting second flue gas, and the second flue gas enters a clinker warehouse through second powder recovered by a second dust collector.
For the purification of the first flue gas, there are two processes. The first process is that the first fume is first introduced into the humidifying tower, the humidifying tower sprays water to cool the high temperature fume, and outputs wet low temperature gas at 100-120 deg.c, and the wet low temperature gas is then filtered in the first dust collector, the first powder after being filtered and dedusted is finally discharged in the homogenizer. The main drawbacks of the first process described above are: a large amount of water is needed for spraying and cooling, so that the consumption of energy and water resources is high; the heat in the first flue gas is not utilized; the content of the nitrogen oxide in the first flue gas is higher, so that the emission of the nitrogen oxide in the dedusted flue gas does not reach the standard; the cloth bag dust collector has poor filtering efficiency and the dust emission is easy to exceed the standard. The second process is that the first flue gas is firstly introduced into an SCR (selective catalytic reduction) reactor for denitration, and then is introduced into a humidifying tower, the wet low-temperature gas output by the humidifying tower enters a cloth bag dust collector for filtering and dust removal, the first powder after filtering and dust removal enters a homogenizer, and the dust-removed flue gas is discharged. Compared with the first process, the second process only solves the denitration problem, but brings about the derivative problems of easy poisoning, blockage and the like of the SCR catalyst, so that the denitration efficiency is low, and the normal operation of purification is influenced.
For the purification of the second flue gas, the existing process is similar to the aforementioned first process, and therefore the following disadvantages still exist: a large amount of water is needed for spraying and cooling, so that the consumption of energy and water resources is high; the heat in the second flue gas is not utilized; the cloth bag dust collector has poor filtering efficiency and the dust emission is easy to exceed the standard.
FIG. 1 is a schematic structural diagram of a high-temperature flue gas purification device of a cement raw mill according to an embodiment of the present invention. As shown in fig. 1, the high temperature flue gas purification device of cement raw mill comprises: the system comprises a flue gas filtering dust collector unit 12, an SCR denitration reactor unit 13, a waste heat boiler unit 14 and an SCR denitration reducing agent output pipeline unit.
The flue gas filtering dust remover unit 12 is used for receiving the high-temperature flue gas (first flue gas) output by the raw material mill 11, physically intercepting dust in the high-temperature flue gas through a high-temperature resistant filter element, and outputting the dedusted flue gas with the temperature of 250-400 ℃. The filtered dust enters the homogenizer 16.
The SCR denitration reactor unit 13 is configured to receive the dedusted flue gas to which an SCR denitration reducing agent (such as liquid ammonia, urea, ammonia water, etc.) is added, and output the denitrated flue gas after passing through an SCR denitration catalyst. The SCR denitration reactor unit 13 may be assembled on the flue gas filtering dust collector unit 12 to form a dust-removing and denitration integrated device.
The exhaust-heat boiler unit 14 is used for receiving the denitrated flue gas and the feed water, exchanging heat and then outputting water vapor and cooled flue gas respectively. The cooled flue gas passes through a fan 19 and is discharged through a chimney 20. The steam may be input to a turbine for power generation. The tube heat pipes in the waste heat boiler unit 14 are preferably fin heat exchange tubes.
And the SCR denitration reducing agent output pipeline unit is used for adding the SCR denitration reducing agent into the conveying channel of the high-temperature flue gas and/or the conveying channel of the dedusted flue gas.
The high-temperature flue gas purification device of the cement raw meal mill firstly filters, removes dust and purifies the high-temperature flue gas output by the raw meal mill through the flue gas filter dust collector unit 12, then adjusts the high-temperature flue gas into dedusted flue gas, then carries out denitration on the dedusted flue gas through the SCR denitration reactor unit 13 to obtain denitrated flue gas, and finally adjusts the denitrated flue gas into cooled flue gas through the waste heat boiler unit 14.
The output temperature of the flue gas filtering dust collector unit 12 is 250-400 ℃, the temperature range does not affect the high temperature resistant filter element in the flue gas filtering dust collector unit 12The service life of (2); meanwhile, the temperature of the dedusted flue gas can be kept at the high-temperature SCR denitration catalyst (for example, tiO is used as the denitration catalyst) 2 As a carrier, V 2 O 5 And WO 3 SCR denitration catalyst that is an active ingredient) in order to secure the denitration effect. In addition, dust removal is carried out before denitration, so that the SCR denitration catalyst can be prevented from being blocked by dust, and the catalyst poisoning is prevented.
Can fully retrieve the heat of high temperature flue gas through exhaust-heat boiler unit 14 and profit, especially get into exhaust-heat boiler unit 14's denitration flue gas dust content is little, and consequently, the heat exchange efficiency between the tube bundle in denitration flue gas and exhaust-heat boiler unit 14 is higher, so can promote exhaust-heat boiler unit's heat exchange efficiency to reduce the influence of dust to exhaust-heat boiler unit 14.
Fig. 3 is a schematic structural view of a high-temperature flue gas purification device of a cement raw mill in an embodiment of the invention. Fig. 4 is a left side view of the high temperature flue gas cleaning apparatus of the cement raw mill shown in fig. 3. As shown in fig. 3 to 4, a high temperature flue gas cleaning apparatus for a cement raw mill comprises: the flue gas filtering and dust removing unit 12 is used for receiving high-temperature flue gas (first flue gas) output by the raw material mill 11, physically intercepting dust in the high-temperature flue gas through a high-temperature resistant filter element, and outputting the dedusted flue gas with the temperature of 250-400 ℃; an SCR denitration reactor unit 13 configured to receive the dedusted flue gas to which the SCR denitration reducing agent is added, pass through an SCR denitration catalyst 132, and output a denitrated flue gas; the waste heat boiler unit 17 is used for receiving the denitrated flue gas and the feed water, exchanging heat and then respectively outputting water vapor and cooled flue gas; the SCR denitration reactor unit 13 and the waste heat boiler unit 17 are respectively assembled on the flue gas filtering dust remover unit 12 to form dust removal denitration heat exchange integrated equipment.
The waste heat boiler unit 17 functions in the same way as the second waste heat boiler unit 14. Compare in aforementioned dust removal denitration integration equipment, above-mentioned dust removal denitration heat transfer integration equipment can further reduce flue gas denitration to the calorific loss of flue gas heat transfer in-process, promotes waste heat utilization efficiency.
The flue gas filtering dust remover of the flue gas filtering dust remover unit 12 comprises a filter shell 122, an ash hopper 123 is arranged at the lower part of the filter shell 122, an ash discharging device is connected to the bottom of the ash hopper 123, a pore plate is arranged in the filter shell 122, a filter element 121 is arranged on the pore plate, the pore plate and the filter element 121 divide the filter shell 122 into a lower original gas chamber 124 and an upper purified gas chamber 125, and the filter element 121 is positioned in the lower original gas chamber 124.
The filter element 121 is preferably a filter bag, the filter bag includes a metal filter membrane, the metal filter membrane is rolled into a tubular structure, the upper end of the tubular structure is provided with a connector, and the lower end of the tubular structure is sealed by a bottom cover, the connector is used for installing the filter bag in the flue gas filtering dust collector unit 12. Compared with the traditional high-temperature resistant ceramic filter element, the filter bag has lower cost and good high-temperature resistance. In addition, the metal filtering membrane can be rolled into a tubular structure, which shows that the metal filtering membrane has a thin thickness and is helpful for ensuring the filtering flux. The metal filtering membrane has high filtering efficiency and long service life, and can realize standard emission of dust.
The SCR denitration reactor unit 13 includes a reactor housing 131, the SCR denitration catalyst 132 is installed in the reactor housing 131, the reactor housing 131 and the filter housing 122 are connected into a whole, and the reactor housing 131 is communicated with the upper gas purging chamber 125 and is formed by a housing of the upper gas purging chamber 125 or is located at the top of the upper gas purging chamber.
The flue 171 of the waste heat boiler unit 17 is vertically arranged and located at the top of the reactor shell 131, and is communicated with the reactor shell 131.
The flue gas filtering dust collector unit 12 further comprises a left flue gas filtering dust collector 12A and a right flue gas filtering dust collector 12B which are arranged in parallel along the left-right direction, and the left flue gas filtering dust collector 12A and the right flue gas filtering dust collector 12B are respectively provided with at least one flue gas filtering dust collector which is arranged along the front-back direction. An air inlet main flue 126 is arranged between the left flue gas filtering dust remover and the right flue gas filtering dust remover, and the air inlet main flue 126 is respectively communicated with the lower original air chambers 124 of the flue gas filtering dust removers in the flue gas filtering dust remover unit 12. In addition, an exhaust main flue 127 may be further disposed between the left flue gas filter dust collector 12A and the right flue gas filter dust collector 12B, the exhaust main flue 127 may be located above the intake main flue 126, and the exhaust main flue 127 is respectively communicated with the upper air-purifying chamber 125 of each flue gas filter dust collector in the flue gas filter dust collector unit 12. When the flue gas filtering dust remover unit 12 comprises a plurality of flue gas filtering dust removers, the flue gas filtering dust removers are arranged in the above arrangement mode, so that the flue gas filtering dust remover unit 12 has a more reasonable structure.
Because the air inlet main flue 126 and the exhaust main flue 127 are located between the left flue gas filtering dust remover 12A and the right flue gas filtering dust remover 12B, the width of the flue gas filtering dust remover unit 12 in the left-right direction is increased, and at this time, the length of the tube bundle (the tube bundle of the heat exchange equipment such as an evaporator and an economizer) in the waste heat boiler unit 17 can be arranged in the same direction as the width of the flue gas filtering dust remover unit 12 in the left-right direction, so that a larger heat exchange area is ensured.
An exhaust channel 128 is opened at the top of the exhaust main flue 127, and the reactor shell 131 is arranged at the top of the exhaust channel 128 and is communicated with the exhaust main flue 127 through the exhaust channel 128. In this way, the dedusted flue gases entering the exhaust stack 127 can enter the reactor housing 131 from the exhaust channel 128.
The reactor housing 131 is arranged right above the whole exhaust main 127, and the width of the reactor housing 131 in the left-right direction is smaller than that of the flue gas filter dust collector unit 12 in the left-right direction. Thus, an operation space can be formed at the top of the flue gas filter dust collector unit 12 at both sides of the reactor housing 131 for installation and replacement of the SCR denitration catalyst 132.
The top of the reactor shell 131 is further provided with a diversion flue 133, and a flue 171 of the waste heat boiler unit 17 is vertically arranged at the top of the diversion flue 133 and communicated with the reactor shell 131 through the diversion flue 133. The left-right width of the flue 171 of the exhaust-heat boiler unit 17 is the same as the left-right width of the flue gas filter dust collector unit 12, and the left-right width of the diversion flue 133 is also the same as the left-right width of the flue gas filter dust collector unit 12. In this way, the diversion flue 133 can sufficiently buffer the denitrated flue gas that is about to enter the flue 171 of the waste heat boiler unit 17, so that the flow field in the flue 171 of the waste heat boiler unit 17 is more uniform.
Fig. 5 is a schematic structural view of a high-temperature flue gas purification device of a cement raw mill in an embodiment of the invention. As shown in fig. 5, the apparatus of this embodiment differs from the apparatus shown in fig. 3-4 in that: the flue 171 of the waste heat boiler unit 17 is disposed at a side of the reactor housing 131, and the flue 171 of the waste heat boiler unit 17 is vertically disposed at a side of the guide flue 133. Therefore, the overall height of the dedusting, denitration and heat exchange integrated equipment is reduced.
FIG. 6 is a schematic structural view of a high-temperature flue gas purification device of a cement raw mill in an embodiment of the present invention. As shown in fig. 6, the apparatus of this embodiment differs from the apparatus shown in fig. 3-4 in that: the reactor shell 131 is arranged right above the front section of the exhaust main flue 127, the length of the reactor shell 131 in the front-back direction is smaller than that of the flue gas filtering and dust removing unit 12 in the front-back direction, and the flue 171 of the waste heat boiler unit 17 is transversely arranged between the top of the flue gas filtering and dust removing unit 12 and the side of the SCR denitration reactor unit 13. From this, help ensureing that the whole height and the fore-and-aft length of dust removal denitration heat transfer integration equipment are all can not too big.
FIG. 2 is a schematic view of a high-temperature flue gas purification device of a cement clinker burning cooler according to an embodiment of the present invention. As shown in fig. 2, the high-temperature flue gas purification device of the cement clinker firing cooler comprises: a flue gas filter dust collector unit 23 and a waste heat boiler unit 24.
The flue gas filtering dust remover unit is used for receiving the high-temperature flue gas (second flue gas) output by the cooler 29, physically intercepting dust in the high-temperature flue gas through a high-temperature resistant filter element, and then outputting the dedusted flue gas with the temperature of 250-500 ℃ and preferably 300-500 ℃ (such as 350 ℃ and 400 ℃).
The exhaust-heat boiler unit 24 is configured to receive the denitrated flue gas and the first water supply, perform heat exchange, and output water vapor and cooled flue gas respectively. The cooled flue gas passes through a fan 27 and is discharged through a stack 28.
The high-temperature flue gas purification device of the cement burning clinker cooling machine firstly filters, removes dust and purifies the high-temperature flue gas output by the cement burning clinker cooling machine 29 through the flue gas filtering and dust removing unit 23, then adjusts the high-temperature flue gas into dust-removed flue gas, and then adjusts the dust-removed flue gas into cooled flue gas through the waste heat boiler unit 24.
The output temperature of the flue gas filtering dust remover unit 23 is 250-500 ℃, and the temperature range does not influence the service life of a high temperature resistant filter element in the flue gas filtering dust remover unit.
Optionally, in the high-temperature flue gas purification apparatus for a cement clinker firing cooler, the high-temperature resistant filter element is a filter bag, the filter bag includes a metal filter membrane, the metal filter membrane is rolled into a tubular structure, the upper end of the tubular structure is provided with a connector, the lower end of the tubular structure is sealed by a bottom cover, and the connector is used for installing the filter bag in the flue gas filtering dust collector unit 23. The metal filtering membrane has high filtering efficiency and long service life, and can realize standard emission of dust.
Can fully retrieve the heat of high temperature flue gas through exhaust-heat boiler unit 24 and profit, especially get into exhaust-heat boiler unit 24's denitration flue gas dust content is little, and consequently, the heat exchange efficiency between the tube bundle in denitration flue gas and exhaust-heat boiler unit 24 is higher, so can promote exhaust-heat boiler unit 24's heat exchange efficiency to reduce the influence of dust to exhaust-heat boiler unit 24.
Optionally, the high-temperature flue gas purification device of the cement clinker firing cooler further includes a feed water preheating unit 25, which is configured to receive the high-temperature dust and the second feed water discharged by the flue gas filtering and dust removing unit 23, and heat the second feed water through the high-temperature dust, so as to output the first feed water formed by heating the second feed water. The dust after heat exchange enters the clinker silo 26. The first feed water after heat exchange enters the waste heat boiler unit 24. Thus, the first feed water can be preheated by the high-temperature dust discharged from the flue gas filter dust collector unit 23.
The water preheating unit 25 may be of a structure similar to a partition wall heat exchanger, in which there are a high-temperature dust conveying passage and a water conveying flux, and the two passages transfer heat through a heat transfer wall, so as to realize a function of preheating the first feed water by using the high-temperature dust discharged from the flue gas filtering dust collector unit 23.
The clinker sintering cooler 29 is usually a grate cooler, and the temperature of the flue gas output by the grate cooler can be greatly changed by adjusting the operation parameters of the grate cooler. For example, the temperature of the flue gas output by the grate cooler can be higher, for example, 600 ℃, and at this time, the high-temperature flue gas purification device of the cement-fired clinker cooler can further include a pre-waste heat boiler unit, which is used for receiving the high-temperature flue gas output by the cooler 29 and third feed water, performing heat exchange, and then outputting water vapor and the cooled high-temperature flue gas respectively; the flue gas filtering dust collector unit 23 is configured to receive the high-temperature flue gas output by the pre-heat recovery boiler unit, physically intercept dust in the high-temperature flue gas by using a high-temperature resistant filter element, and output the dedusted flue gas with a temperature of 250-500 ℃. Therefore, the residual heat of the high-temperature flue gas output by the cooler 29 can be more fully utilized.
FIG. 7 is a schematic view of a partial structure of a high-temperature flue gas purification device of a cement clinker cooling machine according to an embodiment of the present invention. As shown in fig. 7, the housing of the flue of the exhaust-heat boiler unit 24 and the housing of the flue of the pre-exhaust-heat boiler unit are assembled to each other, so that the exhaust-heat boiler unit and the pre-exhaust-heat boiler unit form an integrated heat exchange device, and a gas supply flue and a return flue are distributed on the periphery of the integrated heat exchange device; the flue gas filtering dust collector unit 23 is arranged beside the integrated heat exchange device, the integrated heat exchange device is connected with the gas inlet of the flue of the front exhaust-heat boiler unit through the gas supply flue, and the integrated heat exchange device is connected with the gas inlet of the flue of the exhaust-heat boiler unit 24 through the backflow flue and the gas outlet of the flue gas filtering dust collector unit 12.
Specifically, the flue of the front waste heat boiler unit is arranged in the vertical direction, the air inlet and the air outlet of the front waste heat boiler unit are distributed at the lower part and the upper part of the flue of the front waste heat boiler unit, the lower part of the flue of the front waste heat boiler unit is provided with an ash bucket, and the bottom of the ash bucket is connected with an ash unloading mechanism; the flue of the waste heat boiler unit 24 is arranged in the vertical direction, and the air inlet and the air outlet of the waste heat boiler unit are distributed at the upper part and the lower part of the flue of the waste heat boiler unit; an exhaust port of a flue of the front waste heat boiler unit is in butt joint with an air inlet of a flue of the waste heat boiler unit, so that the front waste heat boiler unit and the waste heat boiler unit form an inverted U-shaped structure (as shown in fig. 7). The integrated heat exchange equipment has a compact structure, can save the whole occupied area, and is convenient for ash discharge.
In addition, the preposed waste heat boiler unit and at least the heat exchange tube in the waste heat boiler unit adopt a fin heat exchange tube, and when the heat exchange tube in the preposed waste heat boiler unit does not adopt the fin heat exchange tube, a smooth surface heat exchange tube is adopted.
In addition, the front waste heat boiler unit comprises a first superheater 111, a first evaporator 112 and a first economizer 113 which are sequentially arranged from front to back along the flue of the front waste heat boiler unit; the exhaust-heat boiler unit 24 comprises a second evaporator 141 and a second economizer 142 which are sequentially arranged from front to back along the flue of the exhaust-heat boiler unit; the steam outlet of the steam drum correspondingly connected with the second evaporator 142 is connected to the steam inlet of the first superheater 111 through a steam conveying pipeline.
In the high-temperature flue gas purification device for the cement raw mill, the waste heat boiler unit 24 is assembled on the flue gas filtering dust collector unit 23 to form dust removal and heat exchange integrated equipment.
Referring to fig. 3 to 6, the flue gas filtering dust collector of the flue gas filtering dust collector unit 23 includes a filter housing, the lower portion of the filter housing is provided with an ash bucket, the bottom of the ash bucket is connected with an ash discharging device, the filter housing is provided with a pore plate, the pore plate is provided with a high temperature resistant filter element, the pore plate and the high temperature resistant filter element separate the filter housing into a lower raw gas chamber and an upper clean gas chamber, and the high temperature resistant filter element is located in the lower raw gas chamber; the flues of the waste heat boiler unit 26 are arranged vertically or transversely and are positioned at the top and/or the side of the filter shell.
In addition, the flue gas filtering dust collector unit 23 comprises a left flue gas filtering dust collector and a right flue gas filtering dust collector which are arranged side by side along the left-right direction, the left flue gas filtering dust collector and the right flue gas filtering dust collector are respectively provided with at least one flue gas filtering dust collector which is arranged along the front-back direction, an air inlet main flue is arranged between the left flue gas filtering dust collector and the right flue gas filtering dust collector, and the air inlet main flue is respectively communicated with a lower original air chamber of each flue gas filtering dust collector in the flue gas filtering dust collector unit; the length of the tube bundle in the exhaust heat boiler unit 24 and the left-right width of the flue gas filtering and dust removing unit 23 are arranged in the same direction.
The cement production system of the embodiment of the invention comprises:
a raw meal production section comprising a raw meal mill for receiving cement production raw materials and high temperature gas from a cyclone preheater and outputting first flue gas, the first flue gas being fed to a homogenizer from first powder recovered by a first dust collector;
the clinker production section comprises a burnt clinker cooler, the burnt clinker cooler is used for receiving burnt clinker from the calcining equipment, cooling the burnt clinker by air and outputting second flue gas, and the second flue gas enters a clinker warehouse through second powder recovered by a second dust collector;
and the finished product production section comprises a powder concentrator, the powder concentrator is used for receiving powder from the ball mill and outputting third flue gas containing the sorted fine powder, and the third flue gas enters a finished product warehouse through third powder recycled by a third dust collector.
The second dust collector adopts the high-temperature flue gas purification device of the cement sintered clinker cooler, wherein the second flue gas as the high-temperature flue gas output by the cooler enters the high-temperature flue gas purification device of the cement sintered clinker cooler, the dust filtered by a flue gas filtering and dust removing unit of the high-temperature flue gas purification device of the cement sintered clinker cooler as second powder enters a clinker storage, and the cooled flue gas is discharged;
and/or the first dust collector adopts the high-temperature flue gas purification device of the cement raw mill, wherein the first flue gas is taken as the high-temperature flue gas output by the raw mill and enters the high-temperature flue gas purification device of the cement raw mill, the dust filtered by the flue gas filtering and dust removing unit of the high-temperature flue gas purification device of the cement raw mill is taken as the first powder and enters the homogenizer, and the cooled flue gas is discharged.
The contents related to the present application are explained above. Those of ordinary skill in the art will be able to implement the present application based on these teachings. All other embodiments, which can be derived by a person skilled in the art from the above description without inventive step, are intended to be within the scope of patent protection.
Claims (10)
1. Cement burns chamotte cooler high temperature gas cleaning device, its characterized in that includes:
the flue gas filtering dust remover unit is used for receiving the high-temperature flue gas output by the cooler, physically intercepting dust in the high-temperature flue gas through a high-temperature resistant filter element, and then outputting the dedusted flue gas with the temperature of 250-500 ℃ and preferably 300-500 ℃; and
and the waste heat boiler unit is used for receiving the denitrated flue gas and the first feed water, exchanging heat and then respectively outputting water vapor and cooled flue gas.
2. The high-temperature flue gas purification device of a cement clinker firing cooler as recited in claim 1, wherein: the flue gas filter dust collector unit is used for collecting high-temperature dust discharged by the flue gas filter dust collector unit and second feed water, and the high-temperature dust is used for heating the second feed water so as to output first feed water formed by heating the second feed water;
and/or the like, and/or,
the high-temperature-resistant filter element is a filter bag, the filter bag comprises a metal filter membrane, the metal filter membrane is rolled into a tubular structure, the upper end of the tubular structure is provided with a connector, the lower end of the tubular structure is sealed by a bottom cover, and the connector is used for installing the filter bag in the flue gas filtering dust collector unit;
and/or the like and/or,
the flue gas of flue gas filtration dust remover unit filters the dust remover and contains filter housing, filter housing's lower part is equipped with the ash bucket, the ash bucket bottom is connected with the dust discharging device, be equipped with the orifice plate in the filter housing, install high temperature resistant filter core on the orifice plate, orifice plate and high temperature resistant filter core will filter housing separates for former air chamber in lower part and upper portion gas-purifying chamber, high temperature resistant filter core is arranged in the former air chamber in lower part.
3. The high-temperature flue gas purification device of a cement clinker firing cooler as recited in claim 1, wherein: the system also comprises a preposed waste heat boiler unit which is used for receiving the high-temperature flue gas output by the cooler and third feed water, exchanging heat and then respectively outputting water vapor and the cooled high-temperature flue gas;
the flue gas filtering dust remover unit is used for receiving the high-temperature flue gas output by the preposed waste heat boiler unit, physically intercepting dust in the high-temperature flue gas through a high-temperature resistant filter element and outputting the dedusted flue gas with the temperature of 250-500 ℃.
4. The high-temperature flue gas purification device of a cement clinker firing cooler as recited in claim 3, wherein: the shell of the flue of the waste heat boiler unit and the shell of the flue of the preposed waste heat boiler unit are assembled with each other to enable the waste heat boiler unit and the preposed waste heat boiler unit to form an integrated heat exchange device, and a gas feeding flue and a return flue are distributed at the periphery of the integrated heat exchange device;
the flue gas filters the dust remover unit and arranges integral type indirect heating equipment's side, integral type indirect heating equipment passes through the flue of supplying gas will the gas vent of leading exhaust-heat boiler unit's flue with the air inlet of flue gas filters the dust remover unit is connected, integral type indirect heating equipment passes through the return flow flue will the gas inlet of exhaust-heat boiler unit's flue with the gas vent of flue gas filtration dust remover unit is connected.
5. The high-temperature flue gas purification device of a cement clinker firing cooler as recited in claim 4, wherein: the flue of the front waste heat boiler unit is arranged in the vertical direction, an air inlet and an air outlet of the front waste heat boiler unit are distributed at the lower part and the upper part of the flue of the front waste heat boiler unit, an ash bucket is arranged at the lower part of the flue of the front waste heat boiler unit, and the bottom of the ash bucket is connected with an ash unloading mechanism;
the flue of the waste heat boiler unit is arranged in the vertical direction, and the air inlet and the air outlet of the waste heat boiler unit are distributed at the upper part and the lower part of the flue of the waste heat boiler unit;
and an exhaust port of a flue of the front waste heat boiler unit is in butt joint with an air inlet of a flue of the waste heat boiler unit, so that the front waste heat boiler unit and the waste heat boiler unit form an inverted U-shaped structure.
6. The high-temperature flue gas purification device of a cement clinker firing cooler as recited in claim 3, wherein: the preposed waste heat boiler unit and at least a heat exchange tube in the waste heat boiler unit adopt a fin heat exchange tube, and when the heat exchange tube in the preposed waste heat boiler unit does not adopt the fin heat exchange tube, a smooth surface heat exchange tube is adopted;
and/or the like and/or,
the preposed waste heat boiler unit comprises a first superheater, a first evaporator and a first economizer which are sequentially arranged from front to back along a flue of the preposed waste heat boiler unit; the waste heat boiler unit comprises a second evaporator and a second economizer which are sequentially arranged from front to back along a flue of the waste heat boiler unit; and the steam outlet of the steam drum correspondingly connected with the second evaporator is connected to the steam inlet of the first superheater through a steam conveying pipeline.
7. The high-temperature flue gas purification device of a cement raw mill as set forth in claim 1, wherein: the waste heat boiler unit is assembled on the flue gas filtering dust collector unit to form dust-removing and heat-exchanging integrated equipment;
the flue gas filtering dust remover of the flue gas filtering dust remover unit comprises a filter shell, wherein an ash hopper is arranged at the lower part of the filter shell, the bottom of the ash hopper is connected with an ash discharging device, a pore plate is arranged in the filter shell, a high-temperature-resistant filter element is arranged on the pore plate, the pore plate and the high-temperature-resistant filter element divide the filter shell into a lower raw gas chamber and an upper clean gas chamber, and the high-temperature-resistant filter element is positioned in the lower raw gas chamber;
and the flue of the waste heat boiler unit is vertically or transversely arranged and is positioned at the top and/or the side of the filter shell.
8. The high-temperature flue gas cleaning apparatus for a cement raw mill as set forth in claim 7, wherein: the flue gas filtering and dust removing unit comprises a left flue gas filtering and dust removing device and a right flue gas filtering and dust removing device which are arranged in parallel along the left-right direction, the left flue gas filtering and dust removing device and the right flue gas filtering and dust removing device are respectively provided with at least one flue gas filtering and dust removing device which is arranged along the front-back direction, an air inlet main flue is arranged between the left flue gas filtering and dust removing device and the right flue gas filtering and dust removing device, and the air inlet main flue is respectively communicated with a lower original air chamber of each flue gas filtering and dust removing device in the flue gas filtering and dust removing device unit;
the length of the tube bundle in the waste heat boiler unit and the left-right width of the smoke filtering dust remover unit are arranged in the same direction.
9. A cement production system comprising:
a raw meal production section comprising a raw meal mill for receiving cement production raw materials and high temperature gas from a cyclone preheater and outputting first flue gas, the first flue gas being fed to a homogenizer from first powder recovered by a first dust collector;
the clinker production section comprises a burnt clinker cooler, the burnt clinker cooler is used for receiving burnt clinker from the calcining equipment, cooling the burnt clinker by air and outputting second flue gas, and the second flue gas enters a clinker warehouse through second powder recovered by a second dust collector;
a finished product production section, wherein the finished product production section comprises a powder concentrator, the powder concentrator is used for receiving powder from the ball mill and outputting third flue gas containing the sorted fine powder, and the third flue gas enters a finished product warehouse through third powder recycled by a third dust collector;
the method is characterized in that: the second dust collector adopts the high-temperature flue gas purification device of the cement burning clinker cooling machine as claimed in any one of claims 1 to 8, wherein the second flue gas is used as the high-temperature flue gas output by the cooling machine to enter the high-temperature flue gas purification device of the cement burning clinker cooling machine, the dust filtered by the flue gas filtering dust collector unit of the high-temperature flue gas purification device of the cement burning clinker cooling machine is used as the second powder to enter the clinker storage, and the cooled flue gas is discharged.
10. The cement production system as claimed in claim 9, wherein: first dust collector adopts a cement raw mill high temperature flue gas purification device, cement raw mill high temperature flue gas purification device includes:
the flue gas filtering dust remover unit is used for receiving the high-temperature flue gas output by the raw material mill, physically intercepting dust in the high-temperature flue gas through a high-temperature resistant filter element and outputting the dedusted flue gas with the temperature of 250-400 ℃;
the SCR denitration reactor unit is used for receiving the dedusted flue gas added with the SCR denitration reducing agent, passing through an SCR denitration catalyst and outputting the denitrated flue gas;
the waste heat boiler unit is used for receiving the denitrated flue gas and the feed water, exchanging heat and then respectively outputting water vapor and cooled flue gas; and
the SCR denitration reducing agent output pipeline unit is used for adding the SCR denitration reducing agent into the conveying channel of the high-temperature flue gas and/or the conveying channel of the dedusted flue gas;
the first flue gas is used as high-temperature flue gas output by the raw mill and enters a high-temperature flue gas purification device of the cement raw mill, dust filtered by a flue gas filtering dust collector unit of the high-temperature flue gas purification device of the cement raw mill enters a homogenizer as first powder, and the cooled flue gas is discharged.
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