CN213643739U - SCR compressed air self-heating system - Google Patents
SCR compressed air self-heating system Download PDFInfo
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- CN213643739U CN213643739U CN202022547072.1U CN202022547072U CN213643739U CN 213643739 U CN213643739 U CN 213643739U CN 202022547072 U CN202022547072 U CN 202022547072U CN 213643739 U CN213643739 U CN 213643739U
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Abstract
The utility model discloses a SCR compressed air is from heating system, its characterized in that: the bottom of the reaction tower is provided with a heat exchange pipeline, the heat exchange pipeline comprises a compressed air inlet pipeline and a compressed air outlet pipeline, and a heat exchange pipe is connected between the compressed air inlet pipeline and the compressed air outlet pipeline. The utility model discloses SCR compressed air is from heating system, simple structure arranges rationally, and energy-concerving and environment-protective, effective lowering system is power consumptive, has stronger practicality and better application prospect.
Description
Technical Field
The utility model belongs to the technical field of cement clinker production line SCR denitration, more specifically say, relate to SCR compressed air self-heating system.
Background
(1) The production process of the clinker:
the materials prepared according to a certain proportion are fed from the top of a preheater, preheated by a cyclone preheater and then enter a decomposing furnace, decomposed therein, then enter a rotary kiln for calcination, and then enter a grate cooler for cooling, and finally the clinker needed by people is obtained.
(2) Denitration technical background of cement production line
The cement is an important prop industry of national economy, the total output of the Chinese cement industry shows a rapid growth situation in nearly two decades due to the needs of economic development, and as the end of 2019, 1600 cement production lines are accumulated by novel dry-process cement production lines in China, and the cement production capacity is 23.3 hundred million tons.
The rapid development of urbanization and economy does not depart from the contribution of the cement industry, but brings considerable environmental problems, and because the production of cement clinker requires the combustion of fuel to provide heat formation of clinker minerals, a certain amount of nitrogen oxides is generated in the process, and a series of laws and regulations are issued by the national and local governments to limit the emission of NOx.
According to the existing regulations, the NOx emission concentration in general regions is controlled to be less than or equal to 400mg/Nm3, the NOx emission concentration in key regions is controlled to be less than or equal to 320mg/Nm3, and local regulations and regulations are issued by environmental protection departments of local governments to strictly control the emission of pollutants, for example, the 100mg/Nm3 control index requirements are implemented in regions such as Jiangsu, Shandong, Henan and Zhejiang, and the peak staggering production is implemented in regions such as Shandong, Hebei, Shaanxi, Shanxi, Anhui, Jiangsu and Zhejiang in order to control the pollution.
At present, the most widely applied denitration technologies in the cement industry mainly comprise staged combustion and selective non-catalytic reduction denitration (SNCR denitration), wherein the staged combustion is front-end control, the operation cost is not high, but the denitration efficiency is low and is only about 40%; as a measure for further reducing the NOx emission concentration, the SNCR denitration method has the characteristics of simple system flow and low investment, and is widely applied to the cement industry, but the method has the problems of low ammonia water utilization efficiency, large ammonia water consumption, high ammonia escape, corrosion of pipelines and equipment and the like.
When the emission concentration of NOx is further tightened and the ammonia escape index is strictly controlled, the staged combustion and SNCR denitration technology cannot meet the increasingly strict NOx emission standard, and the selective catalytic reduction technology (SCR denitration technology) promotes the reaction of NH3 and NOx by means of high-activity component catalytic reduction, so that the denitration efficiency is high (more than 95%), the ammonia water utilization rate is high, and the like.
The SCR process is a process in which a reductant (NH3 or urea) selectively reacts with NOx to form N2 and H2O over a catalyst, rather than being oxidized by O2, and is referred to as "selectivity". The main reaction is as follows:
the denitration principle diagram is shown in figure 1.
(3) Compressed air condition of SCR system
The ash removal system of the SCR denitration technology adopts a rake type ash remover to remove ash, compressed air is used as an ash removal air source, the temperature of waste gas in an SCR reaction tower is 280-330 ℃, the temperature of the compressed air is about 60 ℃, in order to avoid the temperature difference between the compressed air and a catalyst being large and influence the physical structure performance of the catalyst, a heater is generally additionally arranged at the rear end of the compressed air to heat the gas to be above 120 ℃, the heated gas passes through the rake type ash remover and then blows away ash on the surface of the catalyst at a certain pressure, and therefore the catalyst is ensured not to be blocked. The compressed air consumption of an SCR denitration system of a 5000t/d production line is 50m3/min, the heater is 150kW, and under normal conditions, the power consumption of the system is increased by about 0.6kwh/t.cl by the heater.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that prior art exists, provide a simple structure, arrange rationally, energy-concerving and environment-protective, effective power consumptive SCR compressed air self-heating system of lowering system.
In order to realize the purpose, the utility model discloses the technical scheme who takes does: the SCR compressed air self-heating system is characterized in that: the bottom of the reaction tower is provided with a heat exchange pipeline, the heat exchange pipeline comprises a compressed air inlet pipeline and a compressed air outlet pipeline, and a heat exchange pipe is connected between the compressed air inlet pipeline and the compressed air outlet pipeline.
In order to make the above technical solution more detailed and concrete, the present invention further provides the following preferable technical solution to obtain satisfactory practical effect:
the heat exchange pipeline is arranged above the SCR ash bucket.
The compressed air inlet pipeline and the compressed air outlet pipeline are arranged on one side wall of the SCR ash bucket.
The heat exchange tube is of a U-shaped structure, one end of the heat exchange tube is communicated to a compressed air inlet pipeline, and the other end of the heat exchange tube is communicated to a compressed air outlet pipeline.
The heat exchange pipe faces towards one side wall face in the SCR ash bucket, opposite to the compressed air inlet pipeline and the compressed air outlet pipeline, and is arranged in an extending mode.
The compressed air inlet pipeline and the compressed air outlet pipeline are arranged in parallel at intervals, and the U-shaped opening width of the heat exchange tube is the same as the interval distance between the compressed air inlet pipeline and the compressed air outlet pipeline.
The compressed air inlet pipeline and the compressed air outlet pipeline are provided with a plurality of heat exchange pipes which are arranged at intervals along the length direction of the compressed air inlet pipeline and the compressed air outlet pipeline.
And the air inlet interface of the compressed air inlet pipeline is connected to the air compressor station.
The compressed air outlet pipeline is provided with two symmetrically arranged air outlets.
Compared with the prior art, the utility model, have following advantage: the utility model discloses SCR compressed air is from heating system, simple structure arranges rationally, and energy-concerving and environment-protective, effective lowering system is power consumptive, has stronger practicality and better application prospect.
Drawings
The contents of the drawings and the reference numerals in the drawings of the present specification will be briefly described as follows:
FIG. 1 is a schematic diagram of denitration;
FIG. 2 is a schematic view of the arrangement structure of the heat exchange pipes of the self-heating system of the present invention;
fig. 3 is the schematic view of the arrangement structure of the heat exchange pipeline of the self-heating system of the present invention.
Labeled as: 1.SCR ash bucket, 2, compressed air inlet pipe way, 21, air inlet interface, 3, compressed air-out pipeline, 31, air outlet, 4, heat exchange tube, 5, bracing piece.
Detailed Description
The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings.
The utility model discloses this kind of SCR compressed air is from heating system, as shown in fig. 2, 3, be equipped with the heat transfer pipeline bottom the reaction tower, the heat transfer pipeline includes compressed air admission line 2 and compressed air-out pipeline 3, is connected with heat exchange tube 4 between compressed air admission line 2 and the compressed air-out pipeline 3. The bottom heat exchange device of the SCR reaction tower is added to increase the temperature of compressed air of the SCR system to 200-250 ℃, and meanwhile, the power consumption of the system is increased because a heater is independently added to the SCR system.
The utility model discloses well lid, as shown in fig. 2, 3, heat transfer pipeline arranges in the SCR ash bucket 1 top of reaction tower bottom, conveniently arranges, and can effectually utilize the waste gas enthalpy after the denitration to carry out the heat transfer with compressed air.
The utility model discloses in, compressed air inlet pipe 2 and compressed air play tuber pipe way 3 arrange on 1 lateral wall of SCR ash bucket, as shown in fig. 3. The heat exchange tube 4 is a U-shaped structure, one end of the heat exchange tube 4 is communicated to the compressed air inlet pipeline 2, and the other end of the heat exchange tube 4 is communicated to the compressed air outlet pipeline 3. The heat exchange tube 4 extends towards one side wall surface opposite to the compressed air inlet pipeline 2 and the compressed air outlet pipeline 3 in the SCR ash bucket 1 and is arranged, the width direction of the SCR ash bucket is covered as far as possible, the arrangement structure is convenient to arrange, the heat exchange surface can be increased, and efficient and sufficient heat exchange is carried out.
The utility model discloses in, the parallel interval arrangement of compressed air admission line 2 and compressed air-out pipeline 3, heat exchange tube 4U type opening width is the same with compressed air admission line 2 and compressed air-out pipeline 3 spacing distances, the installation of being convenient for is arranged. A plurality of heat exchange pipes 4 are arranged on the compressed air inlet pipeline 2 and the compressed air outlet pipeline 3 at intervals along the length direction thereof to increase the heat exchange efficiency.
The utility model discloses in, compressed air admission line 2's interface 21 that admits air is connected to the air compressor station. Compressed air-out pipeline 3 is equipped with two symmetrical arrangement's air outlet 31, sets up the air outlet with better satisfying the user demand according to the user demand.
The utility model belongs to novel dry process cement clinker production line SCR denitration technique compressed air heat transfer economizer system. The cement clinker production line uses compressed air as air bubble air supply or prevents blockking up jetting air supply usually, the utility model discloses a make full use of denitration waste gas enthalpy improves the compressed air temperature to reduce the compressed air use amount, reduce the air compressor machine load, reduce air compressor machine system power consumption.
The temperature of exhaust gas at the outlet of a preheater is generally 260-380 ℃, NOx is selectively reduced after passing through an SCR (selective catalytic reduction) reaction tower catalyst, the technology of the patent mainly arranges a heat exchange pipeline at the bottom of the catalyst reaction tower, the waste gas enthalpy after denitration and compressed air are utilized to exchange heat, the temperature of the compressed air can be heated to 200-250 ℃ from about 60 ℃, the compressed air is expanded in volume and increased in pressure in the temperature rising process, the ash removal effect of a rake type ash remover is effectively improved, meanwhile, the compressed air at 200-250 ℃ and the catalyst cannot have large temperature difference to cause the damage of the physical structure of the catalyst, the energy is saved, the environment is protected, and the power consumption of a system is increased by additionally arranging a heater.
Preliminary estimation shows that the heat exchange area is about 120m2, 3000Nm3 compressed air can be heated to about 210 ℃ by water, and the compressed air is enough for an ash removal system of an SCR denitration system to use. The utility model discloses the device is used for novel dry process kiln 2500t/d ~ 12000t/d grog line SCR deNOx systems. Through preliminary calculation, compressed air of an SCR ash removal system of a 5000t/d production line is heated to 210 ℃, a set of heating system can be saved, the power consumption of a normal operation system is reduced by 0.6kwh/t.cl, the power consumption can be saved by about 3600kw every day, 118.8 ten thousand kw every year can be saved, and the power cost can be saved by about 71 ten thousand yuan every year according to the calculation of 0.6 yuan/kw.
The SCR compressed air self-heating system of the utility model fully utilizes the self enthalpy of the denitration waste gas to heat the compressed air, and does not increase any operation cost; the compressed air is heated to 200 ℃ and 250 ℃, so that the physical structural damage of the catalyst caused by large temperature difference is avoided; a set of compressed air heating system is saved, the power consumption of the system in operation is reduced, and the operation cost is saved; the compressed gas heats up and expands in volume, so that the pressure of the gas is increased, and the work load of the air compressor is reduced.
The utility model discloses SCR compressed air is from heating system, simple structure arranges rationally, and energy-concerving and environment-protective, effective lowering system is power consumptive, has stronger practicality and better application prospect.
The present invention has been described above with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, and various insubstantial improvements or direct applications to other applications can be achieved by using the method and technical solution of the present invention, which all fall within the protection scope of the present invention.
Claims (9)
- SCR compressed air self-heating system, its characterized in that: the bottom of the reaction tower is provided with a heat exchange pipeline, the heat exchange pipeline comprises a compressed air inlet pipeline and a compressed air outlet pipeline, and a heat exchange pipe is connected between the compressed air inlet pipeline and the compressed air outlet pipeline.
- 2. The SCR compressed air self-heating system of claim 1, wherein: the heat exchange pipeline is arranged above the SCR ash bucket.
- 3. The SCR compressed air self-heating system of claim 2, wherein: the compressed air inlet pipeline and the compressed air outlet pipeline are arranged on one side wall of the SCR ash bucket.
- 4. The SCR compressed air self-heating system of claim 3, wherein: the heat exchange tube is of a U-shaped structure, one end of the heat exchange tube is communicated to a compressed air inlet pipeline, and the other end of the heat exchange tube is communicated to a compressed air outlet pipeline.
- 5. The SCR compressed air self-heating system of claim 4, wherein: the heat exchange pipe faces towards one side wall face in the SCR ash bucket, opposite to the compressed air inlet pipeline and the compressed air outlet pipeline, and is arranged in an extending mode.
- 6. The SCR compressed air self-heating system of claim 5, wherein: the compressed air inlet pipeline and the compressed air outlet pipeline are arranged in parallel at intervals, and the U-shaped opening width of the heat exchange tube is the same as the interval distance between the compressed air inlet pipeline and the compressed air outlet pipeline.
- 7. The SCR compressed air self-heating system of claim 6, wherein: the compressed air inlet pipeline and the compressed air outlet pipeline are provided with a plurality of heat exchange pipes which are arranged at intervals along the length direction of the compressed air inlet pipeline and the compressed air outlet pipeline.
- 8. SCR compressed air self-heating system according to any of the claims 1 to 7, characterized in that: and the air inlet interface of the compressed air inlet pipeline is connected to the air compressor station.
- 9. The SCR compressed air self-heating system of claim 8, wherein: the compressed air outlet pipeline is provided with two symmetrically arranged air outlets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022547072.1U CN213643739U (en) | 2020-11-06 | 2020-11-06 | SCR compressed air self-heating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022547072.1U CN213643739U (en) | 2020-11-06 | 2020-11-06 | SCR compressed air self-heating system |
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| CN213643739U true CN213643739U (en) | 2021-07-09 |
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| CN202022547072.1U Active CN213643739U (en) | 2020-11-06 | 2020-11-06 | SCR compressed air self-heating system |
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| CN (1) | CN213643739U (en) |
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- 2020-11-06 CN CN202022547072.1U patent/CN213643739U/en active Active
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