CN215112642U - Air preheating system based on heat conduction oil - Google Patents
Air preheating system based on heat conduction oil Download PDFInfo
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- CN215112642U CN215112642U CN202121074795.2U CN202121074795U CN215112642U CN 215112642 U CN215112642 U CN 215112642U CN 202121074795 U CN202121074795 U CN 202121074795U CN 215112642 U CN215112642 U CN 215112642U
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model discloses an air preheating system based on heat conduction oil, which comprises a heat conduction oil primary heating system and an incinerator flue gas secondary heating system; the heat conducting oil primary heating system comprises an SP boiler, a bypass flue control valve, a flue gas cooler, a heat conducting oil circulating pump, a heat conducting oil storage tank and a cold air primary heater; the output side of the heat-conducting oil storage tank is connected with a heat-absorbing oil pipe positioned in the flue gas cooler, and the input side of the heat-conducting oil storage tank is connected with a heat-releasing oil pipe positioned in the cold air primary heater; the cold air primary heater is provided with a cold air inlet and a preheated air outlet; the secondary heating system of the incinerator flue gas comprises an inlet air valve, an air secondary heater, a circulating fan, a circulating air valve and an outlet air valve; the inlet side of the inlet air valve is an incinerator flue gas pipeline, and incinerator flue gas is used for entering an air secondary heater for heating; the problem that low-temperature corrosion is serious at an air inlet is solved, the influence on the existing cement kiln production line is reduced, and the combustion stability of the incinerator is enhanced.
Description
Technical Field
The utility model relates to an air preheating system based on conduction oil belongs to cement kiln and deals with energy-conserving field in coordination.
Background
China is in the historical stage of advancing from industrial culture to ecological culture, and still many ecological problems need to be solved urgently. In recent years, the country puts the solid waste pollution prevention and control at the prominent position of ecological civilization construction, and the domestic waste treatment is an important link of the solid waste pollution prevention and control. At present, the main treatment modes of domestic garbage in China are sanitary landfill and garbage incineration power generation, the domestic garbage is treated by the cooperation of a cement kiln to supplement the sanitary garbage and the garbage, and particularly, the treatment of small-scale domestic garbage is more and more emphasized. The domestic garbage is treated by the cooperation of the cement kiln, so that the reduction, harmlessness and recycling of the domestic garbage treatment can be thoroughly realized, and a new way is opened for the development of circular economy and the creation of green and environment-friendly cement industry in the cement industry.
The domestic garbage has high water content, low heat value, low combustion temperature and unstable combustion, and in order to ensure the smooth ignition and the sufficient combustion of the low heat value garbage and the temperature of a combustion chamber, combustion air is heated to a certain temperature and then is sent into the incinerator. Flue gas can transfer heat with low temperature air among the conventional tubular air preheating device, produces low temperature corrosion easily at first order air preheater, and low temperature corrosion is more serious in air inlet department, and bank of tubes life is short, and especially opening and stopping the stove stage, the air preheater can have high temperature corrosion and the coexistence phenomenon of low temperature corrosion, and it is comparatively serious to corrode, constitutes the threat to the long-term steady operation of burning system.
The cement kiln cooperative treatment can cause the increase of the smoke gas quantity of a cement kiln system and the increase of the system resistance, and the most direct influence is that the yield of cement clinker can be reduced by 3-5%, so that the resistance reduction and yield increase are also an important subject faced by the cooperative treatment technology.
Therefore, a new technical solution is needed to solve the above problems.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model discloses to the disappearance that prior art exists, its main objective provides an air preheating system based on conduction oil, and it has solved the more serious problem of low temperature corrosion in air inlet department, reduces the influence to current cement kiln production line, strengthens burning furnace combustion stability.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an air preheating system based on heat conduction oil comprises a heat conduction oil primary heating system and an incinerator flue gas secondary heating system; wherein:
the heat-conducting oil primary heating system comprises an SP boiler, a bypass flue control valve, a flue gas cooler, a heat-conducting oil circulating pump, a heat-conducting oil storage tank and a cold air primary heater; the input side of the SP boiler is a kiln tail flue gas access pipeline, a bypass flue of the kiln tail flue gas access pipeline is connected to the input side of a flue gas cooler and used for introducing high-temperature kiln tail flue gas, and a bypass flue control valve is arranged on the bypass flue; the heat-conducting oil storage tank is connected with the heat-conducting oil circulating pump, the output side of the heat-conducting oil storage tank is connected with a heat-absorbing oil pipe positioned in the flue gas cooler, and the input side of the heat-conducting oil storage tank is connected with a heat-releasing oil pipe positioned in the cold air primary heater; the output side of the heat conduction oil storage tank is connected with the input side of the heat conduction oil storage tank through a heat absorption oil pipe and a heat release oil pipe to form circulation; the cold air primary heater is provided with a cold air inlet and a preheated air outlet;
the secondary heating system for the flue gas of the incinerator comprises an inlet air valve, an air secondary heater, a circulating fan, a circulating air valve and an outlet air valve; the air secondary heater is provided with a first inlet, a second inlet and a secondary heating outlet; the input side of the inlet air valve is an incinerator flue gas pipeline, the output side of the inlet air valve is connected to a first inlet through a first inlet pipe, the preheated air outlet is connected to a second inlet through a second inlet pipe, the secondary heating outlet is connected with a third inlet pipe, and the circulating fan and the outlet air valve are sequentially arranged along the air feeding direction; and a shunt return pipe is connected to the third inlet pipe corresponding to the position between the outlet air valve and the circulating fan, and the other end of the shunt return pipe is connected to the first inlet pipe.
As a preferred scheme, the heat-conducting oil primary heating system further comprises a small high-temperature fan, and the small high-temperature fan is arranged on the output side of the flue gas cooler.
As a preferred scheme, the heat-conducting oil primary heating system further comprises a kiln tail high-temperature fan, and the kiln tail high-temperature fan is arranged on the output side of the SP boiler.
As a preferred scheme, the heat-conducting oil primary heating system is connected with the SP boiler in parallel.
As a preferred scheme, the heat conducting oil in the heat release oil guide pipe in the cold air primary heater is arranged in a countercurrent mode with the cold air.
As a preferred scheme, the heat-conducting oil in the heat absorption oil guide pipe in the flue gas cooler is arranged in a countercurrent mode with the flue gas at the tail of the high-temperature kiln.
Preferably, the air secondary heater is provided with a discharge port or a discharge pipe with a discharge valve.
Compared with the prior art, the utility model has obvious advantages and beneficial effect, concretely speaking, can know by above-mentioned technical scheme, it mainly forms the setting of primary conduction oil preheating and secondary air heating through conduction oil primary heating system, incinerator flue gas secondary heating system, can utilize kiln tail flue gas heat to heat cold air, especially, adopt the conduction oil as the heat medium, be inclined to remote transport, also saved the heat transfer volume, need not to consider the difficult operation problem of water medium high pressure, the preheater system that has solved cement line resistance grow brings reforms transform the problem, the operation is simple and reliable, and can adopt higher temperature to heat, low temperature corrosion because of the low temperature that leads to the fact of air secondary heater is crossed low in the import temperature has been avoided, the system stability is strengthened, reduce maintenance cost and operation risk; the setting of burning furnace flue gas second grade heating system has been combined to the combination, has guaranteed the flue gas temperature who gets into the dore furnace, can reduce the influence to dore furnace heat and mass transfer, strengthens burning furnace combustion stability.
To illustrate the structural features and functions of the present invention more clearly, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic view of a connection structure and a process flow according to a preferred embodiment of the present invention;
fig. 2 is a schematic view of another connection structure and process flow of the preferred embodiment of the present invention.
The attached drawings indicate the following:
100. heat conduction oil primary heating system 200 and incinerator flue gas secondary heating system
1. SP boiler 2, bypass flue control valve
3. Flue gas cooler 4 and heat conduction oil circulating pump
5. Small high-temperature fan 6 and kiln tail high-temperature fan
7. 8, cold air primary heater of conduction oil storage tank
9. Inlet air valve 10 and air secondary heater
11. Circulating fan 12 and circulating air valve
13. Outlet air valve 14 and kiln tail flue gas access pipeline
15. A bypass flue 16, a discharge pipe.
Detailed Description
Referring to fig. 1, which shows a specific structure of an embodiment of the present invention, a heat-conducting oil-based air preheating system includes a heat-conducting oil primary heating system 100 and an incinerator flue gas secondary heating system 200; wherein:
the heat conducting oil primary heating system 100 comprises an SP boiler 1, a bypass flue control valve 2, a flue gas cooler 3, a heat conducting oil circulating pump 4, a small high-temperature fan 5, a kiln tail high-temperature fan 6, a heat conducting oil storage tank 7 and a cold air primary heater 8. The input side of the SP boiler 1 is a kiln tail flue gas access pipeline 14, a bypass flue 15 of the kiln tail flue gas access pipeline 14 is connected to the input side of the flue gas cooler 3 to introduce part of high-temperature kiln tail flue gas, and the bypass flue control valve 2 is arranged on the bypass flue 15; the heat conducting oil storage tank 7 is connected to the heat conducting oil circulating pump 4, the output side of the heat conducting oil storage tank 7 is connected with a heat absorbing oil pipe located in the flue gas cooler 3, and the input side of the heat conducting oil storage tank 7 is connected with a heat releasing oil pipe located in the cold air primary heater 8; the output side of the heat conduction oil storage tank 7 is connected with the input side of the heat conduction oil storage tank 7 through a heat absorption oil pipe and a heat release oil pipe to form circulation; the primary cold air heater 8 has a cold air inlet and a preheated air outlet. The high-temperature kiln tail flue gas enters a flue gas cooler 3 to heat conducting oil after passing through a bypass flue control valve 2; through adjusting the size of bypass flue control valve 2 to control the high temperature kiln tail flue gas volume that gets into among flue gas cooler 3, the heat and the SP boiler 1 load of controlling the heat conduction oil primary heating system 100 and retrieving, heat conduction oil primary heating system 100 sets up with SP boiler 1 is parallelly connected, reduces the necessity that SP boiler 1 reformed transform, and when cement kiln does not handle domestic waste system in coordination, closes bypass flue control valve 2.
In this example, after the flue gas cooler 3 cools the high-temperature kiln tail flue gas, preferably, after the cooled high-temperature kiln tail flue gas is led out by the small high-temperature fan 5, the small high-temperature fan 5 and the kiln tail high-temperature fan 6 operate to mix and discharge the led-out high-temperature kiln tail flue gas.
The heat conduction oil circulating pump 4 pumps heat conduction oil out of the heat conduction oil storage tank 7 and enters the flue gas cooler 3, low-temperature heat conduction oil in the flue gas cooler 3 is heated and then enters the cold air first-stage 8 heater to heat cold air, after the heat conduction oil is cooled, the heat conduction oil returns to the heat conduction oil storage tank 7, and the heat conduction oil circulating pump 4 continues to pump the heat conduction oil in the heat conduction oil storage tank 7 to the flue gas cooler 3 to be heated, so that circulation is formed; generally, the heat conduction oil has the performances of thermal cracking resistance and chemical oxidation resistance, the heat transfer efficiency is good, the heat dissipation is fast, the thermal stability is good, and if the heat conduction oil is lost, the heat conduction oil storage tank 7 supplements and replaces the loss of the heat conduction oil; the heat conducting oil storage tank 7 is connected in series in the heat conducting oil primary heating system 100.
The cold air primary heater 8 and the flue gas cooler 3 adopt heat conduction oil as a heat medium and form circulation, and the combustion effect of the incinerator is enhanced while cold air is heated. The heat conducting oil in the heat absorption oil conducting pipe in the flue gas cooler 3 and the flue gas at the tail of the high-temperature kiln are arranged in a counter-flow manner, and similarly, the heat conducting oil in the heat discharging oil conducting pipe in the cold air primary heater 8 and the cold air are also arranged in a counter-flow manner; therefore, the cold air heating temperature can be increased on the premise of smaller heat exchange volume, and the space occupied by the heat exchange unit is reduced, so that the preheating system is more compact in structure, convenient to install and apply and free of site space limitation.
The secondary heating system 200 for the incinerator flue gas comprises an inlet air valve 9, an air secondary heater 10, a circulating fan 11, a circulating air valve 12 and an outlet air valve 13. The air secondary heater 10 is provided with a first inlet, a second inlet and a secondary heating outlet; the input side of the inlet air valve 9 is an incinerator flue gas pipeline, the output side of the inlet air valve 9 is connected to a first inlet through a first inlet pipe, the preheated air outlet is connected to a second inlet through a second inlet pipe, the secondary heating outlet is connected with a third inlet pipe, and the circulating fan 11 and the outlet air valve 13 are sequentially arranged along the air feeding direction; a shunt return pipe is connected to the third inlet pipe at a position corresponding to the position between the outlet air valve 13 and the circulating fan 11, and the other end of the shunt return pipe is connected to the first inlet pipe. After the inlet air valve 9 and the circulating air valve 12 are opened, the high-temperature flue gas from the incinerator is mixed with the circulating flue gas at the outlet of the air secondary heater 10 to be cooled, and then the air secondary heater 10 heats cold air; preferably, the heating temperature of the air secondary heater 10 is controlled by adjusting the sizes of the circulating air valve 12 and the circulating fan 11; the cold air is heated to a set temperature and then enters the incinerator to be used as combustion-supporting air, so that energy consumption is saved, and meanwhile, the incineration effect in the incinerator is enhanced. And after the external cold air is heated by the heat-conducting oil primary heating system 100, the external cold air enters the secondary air heater 10 in the secondary flue gas heating system 200 of the incinerator again for secondary heating, so that the waste incineration effect of the grate furnace is further enhanced.
High-temperature flue gas cooled by the air secondary heater 10 passes through the circulating fan 11, one part of the high-temperature flue gas is sent to the outlet air valve 13 and then sent back to the flue gas outlet furnace shell of the incinerator, and the other part of the high-temperature flue gas is sent to the inlet air valve 9 through the circulating air valve 12 and then mixed with the high-temperature flue gas for cooling, so that the material cost of the heat exchanger is saved. Preferably, the air secondary heater 10 may be provided with a discharge port or discharge pipe 16 having a discharge valve, and the opening and closing and size adjustment of the discharge port or discharge pipe 16 may be controlled according to actual requirements.
It should be noted that:
the heat conducting oil is also called heat transfer oil and heat carrier oil, and is an organic heat carrier. Conventional heat carriers are water and steam, however if water is used as a heat carrier above its boiling point, the equipment and system are required to withstand the pressure. And the heat conducting oil can greatly reduce the equipment investment due to the high boiling point. Under the condition of almost normal pressure, the high operation temperature can be obtained, the operation pressure and the safety requirement of a high-temperature heating system are greatly reduced, and the reliability of the system and equipment is improved. The setting of conduction oil storage tank 7, its output is connected with heat absorption oil pipe through conduction oil circulating pump 4, and its input is connected with exothermic oil pipe, and heat absorption oil pipe arranges in flue gas cooler 3, flue gas cooler 3 can understand a first airtight cavity, and the input of this first airtight cavity is connected in bypass flue 15 and supplies partial kiln tail flue gas to insert, and the output of this first airtight cavity is connected in little high temperature fan 5, and heat absorption oil pipe is located first airtight cavity, and the pipe wall outside of heat absorption oil pipe all forms the contact heat transfer with the kiln tail flue gas in the first airtight cavity, and it is effectual to absorb heat. Similarly, the primary cool air heater 8 can also be understood as a second closed cavity, the input end of which is used for the entrance of the outside cool air, and the output end of which is communicated to the secondary air heater 10 through a pipeline (in the actual design, a fan can be arranged on the pipeline to provide the diversion power). The heat release oil pipe is positioned in the second closed cavity, the outer side of the pipe wall of the heat release oil pipe and cold air in the second closed cavity form contact heat exchange, and the heat release effect is good. The peripheral sides of the two end parts of the heat-absorbing oil pipe are hermetically mounted on the wall body of the first closed cavity, and similarly, the peripheral sides of the two end parts of the heat-releasing oil pipe are hermetically mounted on the wall body of the second closed cavity. Preferably, between the output of heat absorption oil pipe and the input of heat release oil pipe, adopt thermal-insulated pipe intercommunication between the two to avoid the conduction oil heat loss after the heat absorption, can adopt different materials with thermal-insulated pipe and heat release oil pipe, heat absorption oil pipe, for example: the heat insulation pipe is made of materials with poor heat conductivity, the heat release oil pipe and the heat absorption oil pipe are made of materials with good heat conductivity, a heat insulation layer can be further wrapped outside the heat insulation pipe (or wrapped by winding a heat insulation strip), and/or a heat insulation coating is coated on the outer wall surface of the heat insulation pipe. The heat insulation pipe, the heat release oil pipe and the heat absorption oil pipe can be connected by adopting a sealing joint, and a quick assembly type joint is preferred; between the output end of the heat release oil pipe and the heat conduction oil storage tank 7, between the heat conduction oil storage tank 7 and the oil guide circulating pump, and between the oil guide circulating pump 4 and the input end of the heat absorption oil pipe, pipes with heat insulation performance are preferably adopted. When the heat conduction oil storage tank is actually used, the heat conduction oil loss is very small, the pipeline connected with the heat conduction oil storage tank is filled with oil, and a small part of heat conduction oil is stored in the heat conduction oil storage tank, so that the heat conduction oil storage tank can be small in size and small in occupied space.
The utility model is mainly designed through a heat-conducting oil primary heating system and an incinerator flue gas secondary heating system, primary heat-conducting oil preheating and secondary air heating are formed, cold air can be heated by utilizing kiln tail flue gas heat, particularly, the heat-conducting oil is adopted as a heat medium and is deviated from remote conveying, the heat exchange volume is also saved, the problem of difficult operation of water medium high pressure is not needed to be considered, the problem of preheater system transformation caused by the increase of cement line resistance is solved, the operation is simple and reliable, higher temperature can be adopted for heating, the low-temperature corrosion of an air secondary heater due to the excessively low inlet temperature is avoided, the system stability is enhanced, and the maintenance cost and the operation risk are reduced; the setting of burning furnace flue gas second grade heating system has been combined to the combination, has guaranteed the flue gas temperature who gets into the dore furnace, can reduce the influence to dore furnace heat and mass transfer, strengthens burning furnace combustion stability.
Claims (7)
1. The utility model provides an air preheating system based on conduction oil which characterized in that: the system comprises a heat-conducting oil primary heating system and an incinerator flue gas secondary heating system; wherein:
the heat-conducting oil primary heating system comprises an SP boiler, a bypass flue control valve, a flue gas cooler, a heat-conducting oil circulating pump, a heat-conducting oil storage tank and a cold air primary heater; the input side of the SP boiler is a kiln tail flue gas access pipeline, a bypass flue of the kiln tail flue gas access pipeline is connected to the input side of a flue gas cooler and used for introducing high-temperature kiln tail flue gas, and a bypass flue control valve is arranged on the bypass flue; the heat-conducting oil storage tank is connected with the heat-conducting oil circulating pump, the output side of the heat-conducting oil storage tank is connected with a heat-absorbing oil pipe positioned in the flue gas cooler, and the input side of the heat-conducting oil storage tank is connected with a heat-releasing oil pipe positioned in the cold air primary heater; the output side of the heat conduction oil storage tank is connected with the input side of the heat conduction oil storage tank through a heat absorption oil pipe and a heat release oil pipe to form circulation; the cold air primary heater is provided with a cold air inlet and a preheated air outlet;
the secondary heating system for the flue gas of the incinerator comprises an inlet air valve, an air secondary heater, a circulating fan, a circulating air valve and an outlet air valve; the air secondary heater is provided with a first inlet, a second inlet and a secondary heating outlet; the input side of the inlet air valve is an incinerator flue gas pipeline, the output side of the inlet air valve is connected to a first inlet through a first inlet pipe, the preheated air outlet is connected to a second inlet through a second inlet pipe, the secondary heating outlet is connected with a third inlet pipe, and the circulating fan and the outlet air valve are sequentially arranged along the air feeding direction; and a shunt return pipe is connected to the third inlet pipe corresponding to the position between the outlet air valve and the circulating fan, and the other end of the shunt return pipe is connected to the first inlet pipe.
2. The heat transfer oil-based air preheating system of claim 1, wherein: the heat conducting oil primary heating system further comprises a small high-temperature fan, and the small high-temperature fan is arranged on the output side of the flue gas cooler.
3. The heat transfer oil-based air preheating system according to claim 1 or 2, wherein: the heat-conducting oil primary heating system further comprises a kiln tail high-temperature fan, and the kiln tail high-temperature fan is arranged on the output side of the SP boiler.
4. The heat transfer oil-based air preheating system of claim 3, wherein: the heat conducting oil primary heating system is connected with the SP boiler in parallel.
5. The heat transfer oil-based air preheating system of claim 1, wherein: the heat conducting oil in the heat release oil guide pipe in the cold air primary heater is arranged in a countercurrent mode with the cold air.
6. The heat transfer oil-based air preheating system according to claim 1 or 5, wherein: and the heat-conducting oil in the heat-absorbing oil guide pipe in the flue gas cooler is arranged in a countercurrent manner with the flue gas at the tail of the high-temperature kiln.
7. The heat transfer oil-based air preheating system of claim 1, wherein: the air secondary heater is provided with a discharge port or a discharge pipe with a discharge valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121074795.2U CN215112642U (en) | 2021-05-19 | 2021-05-19 | Air preheating system based on heat conduction oil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121074795.2U CN215112642U (en) | 2021-05-19 | 2021-05-19 | Air preheating system based on heat conduction oil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215112642U true CN215112642U (en) | 2021-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121074795.2U Active CN215112642U (en) | 2021-05-19 | 2021-05-19 | Air preheating system based on heat conduction oil |
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| CN (1) | CN215112642U (en) |
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2021
- 2021-05-19 CN CN202121074795.2U patent/CN215112642U/en active Active
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