CN211527160U - Drying system tail gas waste heat is from utilization system - Google Patents
Drying system tail gas waste heat is from utilization system Download PDFInfo
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- CN211527160U CN211527160U CN201922025185.2U CN201922025185U CN211527160U CN 211527160 U CN211527160 U CN 211527160U CN 201922025185 U CN201922025185 U CN 201922025185U CN 211527160 U CN211527160 U CN 211527160U
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Abstract
The utility model provides a drying system tail gas waste heat is from utilization system, includes the air-air heat exchanger, and an entry linkage air of air-air heat exchanger, the air obtains clean combustion-supporting wind after wherein the heat transfer, clean combustion-supporting wind inputs to the hot-blast furnace and supports combustion, and hot-blast input after the burning is to the mixing chamber, the mixing chamber entry connects the circulated air, the circulated air mixes in the mixing chamber with the clean combustion-supporting wind after the heating, the mixing chamber export is connected with drying system and is provided the heat source for it, drying system exit linkage collection system, collection system's waste gas input to another entry of air-air heat exchanger provides the heat transfer heat source for the air. The invention can improve the heat efficiency of the drying system to more than 90 percent, has simple and convenient system flow, simple control and small investment and has good economic and social values.
Description
Technical Field
The invention belongs to the technical field of drying systems, and particularly relates to a tail gas waste heat self-utilization system of a drying system.
Background
The main source of the municipal sludge is the product of the purification process of domestic sewage, municipal sewage and the like of residents, and the municipal sludge is different from the soil sludge such as waterworks sludge and the like, has higher organic matter content which is generally more than 50 percent of the dry basis content, and simultaneously contains a large amount of nutrient substances such as nitrogen, phosphorus and the like. As some sewage plants also receive some industrial wastewater, the sludge also contains a certain proportion of heavy metal ions and chemical substances, particularly contains a certain amount of harmful chemical substances, such as adsorbable organic halogen, anion synthetic detergent, polychlorinated biphenyl and the like, and a large amount of pathogenic microorganisms. In addition, since municipal sludge has a high water content and is mainly present in the form of free water, interstitial water, capillary water, and intracellular hydration water, and a part of the free water can be removed only by physical concentration in a general sewage plant, the water content of sludge discharged from the sewage plant is substantially maintained at about 80%, and such sludge is generally called dewatered sludge or dewatered cake.
Along with the acceleration of the urbanization process of China, the discharge amount of municipal sewage is increased year by year, and the annual production amount of urban sludge in China is about 4000 million tons currently as a derivative of the sewage. The traditional deep landfill mode wastes land, is very easy to cause secondary pollution, and cannot realize the purposes of reduction, harmlessness and resource utilization.
The method for treating municipal sludge by using the cement kiln is an important mode of harmless and resource treatment. Japan, the United states and Europe have had industrial applications in this area as early as the 70's and 80's in the last century. China cement manufacturers have been successfully practiced for nearly 20 years in the aspect of utilizing cement kilns to cooperatively dispose industrial solid wastes and hazardous wastes.
At present, the cement kiln system has two modes for treating sludge: one is to directly put dewatered sludge containing 80 percent of water into a kiln, and the method has the disadvantages of small sludge amount in unit time and limited treatment scale due to too high sludge water content; the other way is that the dewatered sludge is dried to a certain degree by utilizing the waste heat of the cement kiln and then is put into the kiln, the sludge treatment amount can be greatly improved by the way, the water content of the dried sludge is about 40 percent, the normal production of the cement kiln can still be influenced to a certain extent, and the further recycling difficulty of the dried sludge is very high.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a tail gas waste heat self-utilization system of a drying system, which has the advantages that the heat efficiency can be improved to more than 90 percent from 70 percent, the system investment is saved, the running cost is low, and the operation is convenient.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a drying system tail gas waste heat is from utilization system, includes the air-air heat exchanger, and an entry linkage air of air-air heat exchanger, the air obtains clean combustion-supporting wind after wherein the heat transfer, clean combustion-supporting wind inputs to the hot-blast furnace and supports combustion, and hot-blast input after the burning is to the mixing chamber, the mixing chamber entry connects the circulated air, the circulated air mixes in the mixing chamber with the clean combustion-supporting wind after the heating, the mixing chamber export is connected with drying system and is provided the heat source for it, drying system exit linkage collection system, collection system's waste gas input to another entry of air-air heat exchanger provides the heat transfer heat source for the air.
And the clean combustion-supporting air is introduced to the hot blast stove through the induced draft fan.
The waste gas of collection system inputs to the draught fan, and the waste gas that goes out the draught fan divide into two the tunnel, gets into the mixing chamber as the circulated air all the way, and partly gets into empty heat exchanger and combustion-supporting wind and carries out the heat exchange.
The sludge is wet sludge produced in the industrial production process.
All combustion-supporting air required by the hot blast stove passes through the air-air heat exchanger.
The tail gas waste heat self-utilization system of the drying system is characterized in that the temperature of the waste gas is 75-110 ℃, the waste gas is reduced to 30-50 ℃ after heat exchange of an air-air heat exchanger, combustion-supporting air is increased to 50-90 ℃, the part of the waste gas serving as circulating air accounts for 30-80% of the total amount of the waste gas, and the waste gas input to the air-air heat exchanger for heat exchange accounts for 20-70% of the total amount of the waste gas.
The coarse separation system is gravity separation or centrifugal separation or the combination of the two, and the fine separation system is cloth bag dust removal or electric dust removal or the combination of the two.
If the collecting system adopts a coarse separating system and a fine separating system, circulating air circulates at the rear end of the coarse separating system, and a circulating fan is arranged on a circulating air pipeline.
Compared with the prior art, the invention has the beneficial effects that:
1) the heat efficiency of the drying system is greatly improved from 70 percent to more than 90 percent.
2) The system is simple to operate and convenient to maintain.
In conclusion, the invention can improve the heat efficiency of the drying system to more than 90 percent, has simple and convenient system flow, simple control and small investment and has good economic and social values.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Fig. 2 is a schematic diagram of a system configuration of the present invention.
FIG. 3 is a schematic diagram of a system of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
In the invention, the sludge can be wet viscous sludge generated in the production process of other industries, and the hot flue gas is the kiln head of a cement plant or the temperature of the kiln head is more than 80 ℃.
As shown in FIG. 1, the process of the present invention is as follows:
the first step is as follows: the air-air heat exchanger is used for exchanging heat and then leading the combustion air to the hot blast stove by the draught fan for combustion supporting.
The second step is that: the combustion-supporting air is heated by the hot blast stove and then enters the mixing chamber to be mixed with the circulating air and then enters the drying system.
The third step: the materials in the drying system are dried and then are brought out by hot air to enter a collecting system, the collecting system can be divided into a coarse separating system and a fine separating system, the coarse separating system can be gravity separating or centrifugal separating or the combination of the two, and the fine separating system can be cloth bag dust removing or electric dust removing or the combination of the two.
The fourth step: in the collection system, dry sludge is collected, waste gas is discharged to enter an induced draft fan, and the temperature of the waste gas is adjustable at 75-110 ℃.
The fifth step: the waste gas is divided into two parts after reaching the outlet of the induced draft fan, one part of the waste gas enters the mixing chamber as circulating air, the other part of the waste gas enters the air-air heat exchanger to exchange heat with flame-retardant air, the proportion of the circulating air in the waste gas is adjustable by 30-80%, and the proportion of the circulating air in the waste gas is adjustable by 20-70%. If the collecting system adopts two parts of a coarse separating system and a fine separating system, a circulating fan is arranged on a circulating air pipeline, and circulating air can circulate at the rear end of the coarse separating system.
And a sixth step: after heat exchange by the air-air heat exchanger, the waste gas is treated by a flue gas purification system and then discharged into the atmosphere.
FIG. 2 shows one of the systems of the present invention
Referring to fig. 2, combustion-supporting air of the hot blast stove is introduced into the hot blast stove 03 through an air-air heat exchanger 01 by an induced draft fan 02, the air is heated to about 550-650 ℃ in the hot blast stove 03 and enters a mixing chamber 04, hot air and circulating air (85-110 ℃) in the mixing chamber 04 are fully mixed to reach a preset mixing temperature (230-280 ℃), the mixture enters a drying furnace 05, the material is dried in the drying furnace 05, the temperature of the drying air is reduced to 85-110 ℃, then the drying material enters a coarse collecting system 06 along with waste gas, coarse particles are collected, fine particles are divided into two parts along with the waste gas at an outlet, one part of the fine particles serving as the circulating air enters the mixing chamber 04 through a regulating valve I07 and a circulating fan 08, the other part of the fine drying material enters a bag-type dust collector 09 and is collected, the drying waste gas enters the induced draft fan 10 and then enters the air-air heat exchanger 01 to exchange heat with, the combustion-supporting air is heated to 50-80 ℃ and enters the hot blast stove 03.
FIG. 3 shows a second embodiment of the system of the present invention
Referring to fig. 3, the combustion-supporting air of the hot blast stove is introduced into the hot blast stove 03 by a draught fan 02 through an air-air heat exchanger 01, heating the mixture in a hot blast stove 03 to about 550-650 ℃, entering a mixing chamber 04, fully mixing the hot air and circulating air (at 85-110 ℃) in the mixing chamber 04 to reach a preset mixing temperature (230-280 ℃), entering a drying furnace 05, the materials are dried in a drying furnace 05, the temperature of drying air is reduced to 85-110 ℃, then the dried materials enter a bag-type dust collector 09 along with waste gas, the materials are collected in the bag-type dust collector 09, the waste gas is divided into two parts at an outlet through the induced draft fan 10, one part of the waste gas enters the mixing chamber 04 through the first adjusting valve 07, the other part of the waste gas enters the air-air heat exchanger 01 through the second adjusting valve 11 to exchange heat with combustion-supporting air, the dried waste gas after heat exchange is cooled to 30-50 ℃ and discharged out of the system, and the combustion-supporting air is heated to 50-80 ℃ and enters the hot blast stove 03.
Although the present invention has been described with reference to the above preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention, and it is intended that all matter contained in the above description or shown in the above drawings shall be interpreted as illustrative and not in a limiting sense, and that all changes, equivalents and modifications that fall within the spirit of the invention are to be embraced by the scope of the invention
In conclusion, the waste gas of the drying system is recycled, so that the energy efficiency of the drying system is greatly increased, the heat efficiency can reach more than 90%, and the system has the advantages of simple and convenient flow, simple control, low investment and good economic and social values.
Claims (7)
1. The utility model provides a drying system tail gas waste heat is from utilization system, its characterized in that, includes empty heat exchanger, and an entry linkage air of empty heat exchanger, the air obtains clean combustion-supporting wind after wherein the heat transfer, clean combustion-supporting wind inputs to the hot-blast furnace and supports combustion, and hot-blast input after the burning is to the mixing chamber, the mixing chamber entry connects the circulated air, the circulated air mixes in the mixing chamber with the clean combustion-supporting wind after the heating, the mixing chamber export is connected with drying system and is provided the heat source for it, drying system exit linkage collection system, collection system's waste gas input extremely another entry of empty heat exchanger provides the heat transfer heat source for the air.
2. The exhaust gas waste heat self-utilization system of the drying system according to claim 1, wherein the clean combustion-supporting air is introduced to the hot blast stove through an induced draft fan.
3. The exhaust gas waste heat self-utilization system of the drying system according to claim 1, wherein the exhaust gas of the collecting system is input into an induced draft fan, the exhaust gas exiting the induced draft fan is divided into two paths, one path enters a mixing chamber as circulating air, and the other portion enters an air-air heat exchanger to exchange heat with combustion-supporting air.
4. The exhaust gas waste heat self-utilization system of the drying system according to claim 1, wherein all combustion air required by the hot blast stove passes through an air-air heat exchanger.
5. The tail gas waste heat self-utilization system of the drying system according to claim 1, wherein the temperature of the waste gas is 75-110 ℃, the waste gas is reduced to 30-50 ℃ after heat exchange through the air-air heat exchanger, the combustion-supporting air is increased to 50-90 ℃, the part of the waste gas serving as circulating air accounts for 30-80% of the total amount of the waste gas, and the waste gas input to the air-air heat exchanger for heat exchange accounts for 20-70% of the total amount of the waste gas.
6. The tail gas waste heat self-utilization system of the drying system according to claim 1, wherein the collecting system is divided into a coarse separating system and a fine separating system, the coarse separating system is gravity separation or centrifugal separation or a combination of the two, and the fine separating system is cloth bag dust removal or electric dust removal or a combination of the two.
7. The tail gas waste heat self-utilization system of the drying system according to claim 1, wherein if the collecting system adopts a coarse separating system and a fine separating system, the circulating air circulates at the rear end of the coarse separating system, and a circulating fan is arranged on a circulating air pipeline.
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| CN201922025185.2U CN211527160U (en) | 2019-11-21 | 2019-11-21 | Drying system tail gas waste heat is from utilization system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110895111A (en) * | 2019-11-21 | 2020-03-20 | 北京中科领向环保研究院有限公司 | Drying system tail gas waste heat self-utilization system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110895111A (en) * | 2019-11-21 | 2020-03-20 | 北京中科领向环保研究院有限公司 | Drying system tail gas waste heat self-utilization system and method |
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