CN204943525U - A kind of device improving SCR reactor cigarette temperature - Google Patents
A kind of device improving SCR reactor cigarette temperature Download PDFInfo
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- CN204943525U CN204943525U CN201520746635.6U CN201520746635U CN204943525U CN 204943525 U CN204943525 U CN 204943525U CN 201520746635 U CN201520746635 U CN 201520746635U CN 204943525 U CN204943525 U CN 204943525U
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- scr reactor
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- 235000019504 cigarettes Nutrition 0.000 title claims abstract description 17
- 239000007921 spray Substances 0.000 claims abstract description 35
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 29
- 239000003546 flue gas Substances 0.000 abstract description 29
- 239000007789 gas Substances 0.000 abstract description 7
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 abstract description 5
- 230000015556 catabolic process Effects 0.000 abstract description 3
- 238000006731 degradation reaction Methods 0.000 abstract description 3
- 239000003054 catalyst Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Treating Waste Gases (AREA)
Abstract
A kind of device improving SCR reactor cigarette temperature, the air outlet of pressure fan connects air heater, hot blast through heating is transported in warm-air pipe, hot blast in warm-air pipe is by being transported in four branched pipes after control valve, branched pipe is arranged in SCR reactor and forms grid, be arranged on the branched pipe in SCR reactor and be provided with mouth spray, mouth is sprayed and is arranged two spray orifices, the radial direction that two spray orifices and mouth spray is that 45 degree of angles are arranged, at inside reactor, grid spout is installed, high temperature air is blown in SCR reactor, high temperature air is mixed with the flue gas in SCR reactor, improve the flue-gas temperature in Benitration reactor, thus reach denitrating system and to put into operation condition, reduce discharged nitrous oxides, the requirement of denitrification apparatus to entrance flue gas temperature can be met, for denitrating system bringing normally into operation creates condition, avoid again increasing economizer gas bypass pipeline, exhaust gas temperature is high causes degradation problem under boiler thermal output.
Description
Technical field
The utility model belongs to generator coal unit denitration technology field, is specifically related to a kind of device improving SCR reactor cigarette temperature.
Background technology
Along with country is to the increasingly stringent of environmental requirement, current coal-burning boiler all needs auxiliary construction denitrification apparatus.In denitrification apparatus, the normal operating temperature of denitrating catalyst is 300 ~ 400 DEG C, and too high or too low flue-gas temperature is all unfavorable for the performance of catalyst activity.Power plant's SCR reactor is arranged between economizer and air preheater, economizer exit cigarette temperature changes along with the variation of boiler load, this arrangement is limited by the flue-gas temperature of economizer exit, when cigarette temperature is lower than 280 DEG C, and the NH that in SCR reactor inlet flue gas, concentration is higher
3and SO
2reaction generates Powdered (NH4)
2sO4, very easily blocking catalyst duct and stick on air preheater, heavy corrosion air preheater, affects unit safety operation.
Economizer and water-cooling wall are as the heat-exchanger rig of boiler, and the low temperature feedwater flowing through economizer and water-cooling wall inside is heat-absorbing medium, and external high temperature flue gas is exothermic medium.In boiler at low load running, the impact that economizer exit cigarette temperature is absorbed heat by economizer and the feedwater of water-cooling wall inside, degree reduces by economizer exit flue gas temperature greatly, can not meet SCR system and put into operation.If improve denitrating system entrance flue gas temperature, increase economizer flue duct bypass or change economizer feedwater flow, boiler exhaust gas loss will certainly be increased, reduce boiler efficiency.Therefore, the method by increasing economizer flue duct bypass and minimizing economizer feedwater flow raising economizer exit cigarette temperature does not possess dissemination.
By national standard " fossil-fuel power plant atmospheric pollutant emission standard ", thermal power plant, all must qualified discharge when any load operation, and denitrating system cannot run that the discharged nitrous oxides concentration that causes requires higher than emission limit, all regards as discharge beyond standards.For certain power plant (2 × 350MW) Thermal generation unit, boiler is when minimum steady combustion load, and the actual cigarette temperature of denitration entrance is lower than 280 DEG C, and SCR system cannot put into operation and will nitrous oxides concentration be caused to discharge higher than limit value requirement.
Utility model content
For the problems referred to above, the utility model patent provides a kind of device improving SCR reactor cigarette temperature, improves Benitration reactor inside smoke temperature, can meet the requirement of denitrification apparatus to entrance flue gas temperature.
The technical solution of the utility model: a kind of device improving SCR reactor cigarette temperature, comprise pressure fan, air heater and warm-air pipe, it is characterized in that: the air outlet of pressure fan connects air heater, hot blast through heating is transported in warm-air pipe, hot blast in warm-air pipe is by being transported in four branched pipes after control valve, branched pipe is arranged in SCR reactor and forms grid, be arranged on the branched pipe in SCR reactor and be provided with mouth spray, mouth is sprayed and is arranged two spray orifices, and the radial direction that two spray orifices and mouth spray is that 45 degree of angles are arranged.
Two spray orifices of described mouth spray are spaced apart 30 millimeters.
The external diameter of described spray orifice is 30 millimeters.
The height of described spray orifice is 30 millimeters.
The spacing of described branched pipe is 1100 millimeters.
Technique effect of the present utility model: the utility model installs grid spout at inside reactor, high temperature air is blown in SCR reactor, high temperature air is mixed with the flue gas in SCR reactor, improve the flue-gas temperature in Benitration reactor, thus reach denitrating system and to put into operation condition, reduce discharged nitrous oxides, the requirement of denitrification apparatus to entrance flue gas temperature can be met, for denitrating system bringing normally into operation creates condition, avoid again increasing that economizer gas bypass pipeline, exhaust gas temperature are high causes degradation problem under boiler thermal output.
Accompanying drawing explanation
Fig. 1 is the utility model overall structure schematic diagram;
Fig. 2 is the utility model nozzle arrangements schematic diagram.
In figure: 1-pressure fan, 2-air heater, 3-warm-air pipe, 4-control valve, 5-branched pipe, 6-mouth sprays, 7-SCR reactor, 8-spray orifice.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is further illustrated:
As illustrated in fig. 1 and 2, a kind of device improving SCR reactor cigarette temperature, comprise pressure fan 1, air heater 2 and warm-air pipe 3, it is characterized in that: the air outlet of pressure fan 1 connects air heater 2, hot blast through heating is transported in warm-air pipe 3, hot blast in warm-air pipe 3 is by being transported in four branched pipes 5 after control valve 4, branched pipe 5 is arranged in SCR reactor 7 and forms grid, be arranged on the branched pipe 5 in SCR reactor 7 and be provided with mouth spray 6, mouth spray 6 being arranged the radial direction that two spray orifices, 8, two spray orifices 8 and mouth spray 6 is that 45 degree of angles are arranged.
Two spray orifices 8 of described mouth spray 6 are spaced apart 30 millimeters.
The external diameter of described spray orifice 8 is 30 millimeters.
The height of described spray orifice 8 is 30 millimeters.
The spacing of described branched pipe 5 is 1100 millimeters.
1, pressure fan and electric heater type selecting
For certain power plant 2 × 350MW Thermal generation unit, boiler when different load, denitration inlet flue gas flow and flue-gas temperature as shown in table 1 below:
Table 1 Denitration in Boiler inlet flue gas parameter
As can be seen from Table 1, when boiler is lower than 30% rated load, needs to throw high temperature air and add heat smoke; Boiler is when 50% rated load, and denitrating system entrance flue gas temperature meets denitration and to put into operation condition.Suppose that flow is spray into reactor after the air heat to 600 DEG C of Q (m3/h), mix completely with the flue gas in reactor, the flue-gas temperature entered in catalyst is 320 DEG C, meets the denitration of SCR reactor and to put into operation condition.
Table look-up: the average external volume specific volume of the dry air of 600 DEG C is: 1.3556KJ/ (Nm3. DEG C)
The average external volume specific volume of the saturated wet flue gas of 280 DEG C is: 1.3786KJ/ (Nm3. DEG C)
The average external volume specific volume of the saturated wet flue gas of 320 DEG C is: 1.3966KJ/ (Nm3. DEG C)
Low-temperature flue gas being heated to 320 DEG C, is 149251m3/h by calculating the flow of air heater.According to result of calculation, pressure fan maximum air supply rate is 80000m3/h, and electric heater heating maximum temperature can reach 700 DEG C.
For improving the flue-gas temperature in reactor, by air from initial heating temperature to required air themperature, the air duct type electric heater selecting heated perimeter wider.Electric heater adopts two end flanges docking modes to connect, and when heating operation, distinguished and admirable through heater, electrical heating is to air channel additional heat and make it be rapidly heated, and delivers to user's end afterwards.The contactor that the power supply of electric heater is corresponding from corresponding general supply control cabinet is introduced, then design circuit controls it as required.For avoiding occurring that heater produces fortuitous event, electric heater air inlet end also needs to install filter screen additional, avoids various foreign matter to enter damage electrothermal tube or affects life-span and the heat dispersion of heating tube.
2, pressure fan, electric heater and hot air duct are arranged
A, B both sides reactor respectively arrange 1 pressure fan and and 1 air heater, air is after electric heater heating, then through pipeline control valve adjust flux, high temperature air sprays in reactor from air grid nozzle and adds heat smoke.Pressure fan and air heater are arranged as Fig. 1.
1 can also see from the graph: the cold wind of every Lateral supply machine outlet is after electric heater heating, the female pipe of hot blast is divided into four road arms, four road arms being respectively equipped with manually operated door and flowmeter, by regulating the aperture of manually operated door, reaching the hot air flow regulating and enter every road arm.Hot air flow is after manual leveling, and every road arm more each point of two-way pipeline enters SCR reactor, with boiler low-temperature fume Homogeneous phase mixing, to improve the temperature that flue gas enters catalyst.
Consider that high-temperature hot air and flue gas can the conveniences installed of Homogeneous phase mixing and hot air duct, the position of 2 ~ 3m above the metal frame platform of SCR reactor outside, the heat distribution pipeline that hot-air mother pipe and internal pipeline material are recommended according to boiler factory is purchased, and the female pipe insulation construction of hot outside adopts 50mm alumina-silicate refractory fibre blanket+100mm high temperature glass wool plate+2mm iron sheet; Air nozzle in reactor: several nozzles are arranged in direction in pairs in angle of 45 degrees respectively left, to the right vertically downward with the lateral of inside, nozzle diameter is 30mm, adjacent nozzle is spaced apart 30mm, make hot-air spray into reactor under the effect of pressure fan pressure head, improve flue-gas temperature equably.
The utility model installs grid spout at inside reactor, high temperature air is blown in SCR reactor, high temperature air is mixed with the flue gas in SCR reactor, improve the flue-gas temperature in Benitration reactor, thus reach denitrating system and to put into operation condition, reduce discharged nitrous oxides, the requirement of denitrification apparatus to entrance flue gas temperature can be met, for denitrating system bringing normally into operation creates condition, avoid again increasing that economizer gas bypass pipeline, exhaust gas temperature are high causes degradation problem under boiler thermal output.
Claims (5)
1. one kind is improved the device of SCR reactor cigarette temperature, comprise pressure fan (1), air heater (2) and warm-air pipe (3), it is characterized in that: the air outlet of pressure fan (1) connects air heater (2), hot blast through heating is transported in warm-air pipe (3), hot blast in warm-air pipe (3) is transported in four branched pipes (5) by after control valve (4), branched pipe (5) is arranged in SCR reactor (7) and forms grid, be arranged on the branched pipe (5) in SCR reactor (7) and be provided with mouth spray (6), mouth spray (6) arranges two spray orifices (8), the radial direction that two spray orifices (8) and mouth spray (6) is that 45 degree of angles are arranged.
2. a kind of device improving SCR reactor cigarette temperature belonging to claim 1, is characterized in that: two spray orifices (8) of described mouth spray (6) are spaced apart 30 millimeters.
3. a kind of device improving SCR reactor cigarette temperature belonging to claim 1, is characterized in that: the external diameter of described spray orifice (8) is 30 millimeters.
4. a kind of device improving SCR reactor cigarette temperature belonging to claim 1, is characterized in that: the height of described spray orifice (8) is 30 millimeters.
5. a kind of device improving SCR reactor cigarette temperature belonging to claim 1, is characterized in that: the spacing of described branched pipe (5) is 1100 millimeters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520746635.6U CN204943525U (en) | 2015-09-24 | 2015-09-24 | A kind of device improving SCR reactor cigarette temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520746635.6U CN204943525U (en) | 2015-09-24 | 2015-09-24 | A kind of device improving SCR reactor cigarette temperature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204943525U true CN204943525U (en) | 2016-01-06 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520746635.6U Active CN204943525U (en) | 2015-09-24 | 2015-09-24 | A kind of device improving SCR reactor cigarette temperature |
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| Country | Link |
|---|---|
| CN (1) | CN204943525U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108386858A (en) * | 2018-03-03 | 2018-08-10 | 浙江安吉天子湖热电有限公司 | A kind of smoke processing system of denitration desulfurization and dedusting |
-
2015
- 2015-09-24 CN CN201520746635.6U patent/CN204943525U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108386858A (en) * | 2018-03-03 | 2018-08-10 | 浙江安吉天子湖热电有限公司 | A kind of smoke processing system of denitration desulfurization and dedusting |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |