CN204554865U - A kind of system improving boiler using brown coal pulverized coal preparation system drying capacity - Google Patents
A kind of system improving boiler using brown coal pulverized coal preparation system drying capacity Download PDFInfo
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- CN204554865U CN204554865U CN201520167580.3U CN201520167580U CN204554865U CN 204554865 U CN204554865 U CN 204554865U CN 201520167580 U CN201520167580 U CN 201520167580U CN 204554865 U CN204554865 U CN 204554865U
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Abstract
The utility model discloses a kind of system improving boiler using brown coal pulverized coal preparation system drying capacity, relate to field of boilers, comprise air preheater, described air preheater is provided with cold First air entrance and heat primary air outlet, cold Secondary Air entrance and the outlet of hot Secondary Air, smoke inlet and exhanst gas outlet thereof, also be furnished with high temperature steam air heater in the heat primary air air channel of the heat primary air outlet of described air preheater, described high temperature steam air heater adopts Steam Heating.The utility model can solve the dry problem of boiler using brown coal, avoids the SCR that conventional boiler using brown coal brings, the problem that preheater investment operating cost is high, high fume temperature, boiler efficiency are low simultaneously; By the requirement adopting simpler scheme to meet pulverized coal preparation system drying capacity, there is relative to other scheme improving pulverized coal preparation system drying capacity the features such as system is simpler, modulability is good, reliability is high, cost is lower, lifting successful.
Description
Technical field
The utility model relates to field of boilers, particularly relates to boiler using brown coal pulverized coal preparation system, is applicable to join medium-speed milling pulverization system, also goes for fanned powder-grinding system.
Background technology
Boiler using brown coal generally needs higher drying capacity, as joined the boiler of medium-speed milling pulverization system, for ensureing pulverized coal preparation system drying capacity, all requires the gentle primary air ratio of higher First air.Low moisture boiler using brown coal in project as overcritical in certain 350MW, adopt medium-speed pulverizer unit pulverized-coal system, primary Calculation enters to grind wind-warm syndrome to be needed to reach 368 DEG C, primary air ratio 31.38%, design enters preheater flue gas temperature 405 DEG C, preheater outlet heat primary air temperature 383 DEG C (for meeting the needs that pulverized coal preparation system is dry and regulate, suggestion preheater exports a wind-warm syndrome to be needed to reach more than 385 DEG C), calculates exhaust gas temperature 138 DEG C (after revising).
During by this design boiler scheme, boiler efficiency only can reach 92.7%, if when exhaust gas temperature being reduced by 10 DEG C, boiler efficiency can improve about 0.5%, more can meet the policy of country's " energy-saving and emission-reduction of coal electricity ".
When designing routinely, during as required that preheater outlet heat primary air wind-warm syndrome reaches more than 380 ~ 400 DEG C, the flue-gas temperature so entering preheater also will reach more than 405 ~ 425 DEG C, and the flue-gas temperature entering denitration is very high, denitration needs to adopt high temperature catalyst, and denitration operating cost is high; The design of preheater also needs special consideration; Exhaust gas temperature is also very high, and boiler efficiency is low; During the change of coal moisture, pulverized coal preparation system adaptive capacity is strong, and comparatively entry actual motion heat primary air temperature lower than design load; Exhaust gas temperature is also higher than design load simultaneously, and boiler efficiency is low.
Although and adopt the boiler using brown coal of fanned powder-grinding system to solve the problem of pulverized coal preparation system drying capacity, the problems such as poor reliability, the repair and maintenance cost of fanned powder-grinding system itself are high, high fume temperature, boiler efficiency are low still exist.
Utility model content
The purpose of this utility model is: propose a kind of system improving boiler using brown coal pulverized coal preparation system drying capacity.
The purpose of this utility model is realized by following technical proposals:
A kind of system improving boiler using brown coal pulverized coal preparation system drying capacity, comprise air preheater, described air preheater is provided with cold First air entrance and heat primary air outlet, cold Secondary Air entrance and the outlet of hot Secondary Air, smoke inlet and exhanst gas outlet thereof, also be furnished with high temperature steam air heater in the heat primary air air channel of the heat primary air outlet of described air preheater, described high temperature steam air heater adopts Steam Heating.
As selection, the steam of described high temperature steam air heater, from extracted steam from turbine, is directly sent back in corresponding Steam Turbine Regenerative System after the heat exchange of described high temperature steam air heater.As further selection, the steam of described high temperature steam air heater, after the heat exchange of high temperature steam air heater, after being heated, then is sent back in corresponding Steam Turbine Regenerative System by the heating surface be arranged in boiler.
As selection, the steam of described high temperature steam air heater is from boiler reheater, and after the heat exchange of described high temperature steam air heater, steam returns to high temperature reheater entrance.Alternately, the steam of described high temperature steam air heater is from boiler reheater, and after the heat exchange of described high temperature steam air heater, steam returns to high temperature reheater outlet.
As further selection, the steam of described high temperature steam air heater is from Low Temperature Reheater outlet vapor.
As selection, the high cylinder steam discharge of steam turbine high-pressure cylinder all enters Low Temperature Reheater, and the steam of described high temperature steam air heater is from described Low Temperature Reheater outlet vapor.As further selection, the steam after the heat exchange of described high temperature steam air heater returns to the second high-pressure heater, and with the second high-pressure heater steam, and the boiler reheater steam entering the first high-pressure heater together send into boiler heating.
The main scheme of aforementioned the utility model and each further selection scheme thereof can independent assortment to form multiple scheme; be the utility model can adopt and claimed scheme: as the utility model; each selection can select any combination with other non-conflicts arranged side by side; those skilled in the art can understand there is multiple combination according to prior art and common practise after understanding the present invention program; be the claimed technical scheme of the utility model, do not do exhaustive at this.
The course of work of the present utility model: by the cold primary and secondary air of flue gas air preheater, and then air preheater outlet heat primary air temperature is heated further by high temperature steam air heater, make heat primary air temperature reach 368 DEG C and more than, meet the requirement of pulverized coal preparation system drying capacity to First air wind-warm syndrome.High temperature steam air heater adopts Steam Heating, high warm hot device outlet heat primary air temperature can adopt the amount of drawing gas to regulate, simplify heat primary air air side regulating system, improve adjustment reliability, vapor (steam) temperature meets demand air being heated to 368 DEG C or higher temperature by 330 ~ 340 DEG C simultaneously.During by this system, the entrance flue gas temperature of SCR and preheater can be reduced to 370 ~ 380 DEG C by 405 DEG C (or higher), the investment avoiding SCR to select high temperature catalyst to bring, the problem that operating cost is high, preheater design difficulty and cost also will reduce simultaneously, exhaust gas temperature also will reduce further, as more favourable in type selectings such as dedustings to boiler follow-up equipment; Boiler efficiency also reaches further raising, and the economy of whole power plant is better, meets country's " energy-saving and emission-reduction of coal electricity " energy policy.
The beneficial effects of the utility model: the dry problem that can solve boiler using brown coal, avoid that SCR that conventional boiler using brown coal brings, preheater investment operating cost are high, high fume temperature, inefficient problem simultaneously; By the requirement adopting simpler scheme to meet pulverized coal preparation system drying capacity, there is relative to other scheme improving pulverized coal preparation system drying capacity the features such as system is simpler, modulability is good, reliability is high, cost is lower, lifting successful.
Accompanying drawing explanation
Fig. 1 is device schematic flow sheet of the present utility model;
In figure, 1-cold First air, 2-cold Secondary Air 3-preheater smoke evacuation, 4-air preheater, 5-pre-heater inlet flue gas, 6-hot Secondary Air 7-heat primary air, 8-high temperature steam air heater 9-draw gas 10-steam discharge;
Fig. 2 is the device schematic flow sheet of the utility model embodiment 1;
In figure, 1-cold First air 2-cold Secondary Air 3-preheater smoke evacuation, 4-air preheater, 5-pre-heater inlet flue gas, 6-hot Secondary Air 7-heat primary air, 8-high temperature steam air heater, 9-steam source, 10-steam discharge;
Fig. 3 is the device schematic flow sheet of the utility model embodiment 2;
In figure, 1-cold First air, 2-cold Secondary Air 3-preheater smoke evacuation, 4-air preheater, 5-pre-heater inlet flue gas, 6-hot Secondary Air 7-heat primary air, 8-high temperature steam air heater, 9-extracted steam from turbine 10-enter Steam Turbine Regenerative System 11-steam heater.
Fig. 4 is the device schematic flow sheet of the utility model embodiment 3;
In figure, the 9-low outlet again of 1-cold First air, 2-cold Secondary Air 3-preheater smoke evacuation, 4-air preheater, 5-pre-heater inlet flue gas, 6-hot Secondary Air 7-heat primary air, 8-high temperature steam air heater is drawn gas, and 10-2# is high adds high 12-steam turbine high-pressure cylinder, 13-high cylinder steam discharge, 14-low-temperature reheater, the 15-high temperature reheater 16-come to export to boiler superheater of adding of 11-1#.
Detailed description of the invention
Below in conjunction with specific embodiments and the drawings, the utility model is further described.
Shown in figure 1, a kind of system improving boiler using brown coal pulverized coal preparation system drying capacity, comprise air preheater 4, air preheater is provided with cold First air 1 entrance and heat primary air 7 exports, cold Secondary Air 2 entrance and hot Secondary Air 6 exports, smoke inlet (pre-heater inlet flue gas 5) and exhanst gas outlet thereof (preheater smoke evacuation 3), also be furnished with high temperature steam air heater 8 in the heat primary air air channel of heat primary air 7 outlet of air preheater 4, high temperature steam air heater 8 adopts Steam Heating.
Adopt running the example of aforementioned system: according to the design parameter of certain engineering, entering to grind heat primary air temperature demand is 368 DEG C, design enters preheater flue gas temperature 405 DEG C, preheater outlet heat primary air temperature 383 DEG C is (for meeting the needs that pulverized coal preparation system is dry and regulate, general recommendations preheater exports a wind-warm syndrome to be needed to reach more than 385 DEG C, now need higher pre-heater inlet cigarette temperature, cause exhaust gas temperature also can be higher), calculate exhaust gas temperature 138 DEG C (after revising).
In order to reduce exhaust gas temperature further, improve boiler efficiency, can by the design of pre-heater inlet flue-gas temperature to 370 ~ 380 DEG C, now preheater outlet heat primary air temperature arrives about 330 ~ 340 DEG C, adopt high temperature steam air heater again, preheater outlet heat primary air temperature is heated further, make heat primary air temperature reach 368 DEG C and more than, meet the requirement of pulverized coal preparation system drying capacity to First air wind-warm syndrome.
High temperature steam air heater adopts Steam Heating, the extracted steam from turbine (or adopt boiler reheater steam) corresponding with heating wind-warm syndrome can be adopted, such as steam turbine 3 steam pumping, vapor (steam) temperature 441 DEG C (underload herein extraction temperature, with substantially suitable at full capacity, meets the requirement that underload adds hot-air completely); Vapor (steam) temperature meets demand air being heated to 368 DEG C or higher temperature by 330 ~ 340 DEG C.
During by this system, the entrance flue gas temperature of SCR and preheater is reduced to 370 ~ 380 DEG C by 405 DEG C (or higher), the investment avoiding SCR to select high temperature catalyst to bring, the problem that operating cost is high, preheater design difficulty and cost also will reduce simultaneously, exhaust gas temperature also will reduce further, as more favourable in type selectings such as dedustings to boiler follow-up equipment; Boiler efficiency also reaches further raising, and the economy of whole power plant is better, meets country's " energy-saving and emission-reduction of coal electricity " energy policy.
Extracted steam from turbine can be selected in high temperature steam air heater vapour source, steam is by after the heat exchange of high temperature steam air heater, vapor (steam) temperature decreases, and can send back to into Steam Turbine Regenerative System, or do not sent back to into Steam Turbine Regenerative System by heating after being arranged in the heating surface heating in boiler.Such as can adopt steam turbine 3 steam pumping, the steam after the heat exchange of high temperature steam air heater enters after sending former " steam condenser " again back to that 3# is high to be added; Steam after the heat exchange of high temperature steam air heater also can heat again; When the vapor (steam) temperature after the heat exchange of high temperature steam air heater is low, also can cancel " steam condenser ", directly send into that 3# is high to be added.
High warm hot device outlet heat primary air temperature adopts the amount of drawing gas to regulate, and simplifies heat primary air air side regulating system, improves adjustment reliability.
Embodiment 1:
See Fig. 2, other are the same, when adopting extracted steam from turbine, high temperature steam air heater 8 steam is from extracted steam from turbine 9, can directly send back in corresponding Steam Turbine Regenerative System after high temperature steam air heater 8 heat exchange, also vapor (steam) temperature can be heated to original temperature by the heating surface be arranged in boiler (steam heater 11), then send back in corresponding Steam Turbine Regenerative System.
Embodiment 2:
See Fig. 3, other are the same, and when adopting reheater steam, high temperature steam air heater 8 steam is from Low Temperature Reheater 13 outlet vapor, after high temperature steam air heater 8 heat exchange, steam can return to high temperature reheater 14 entrance, or directly returns to high temperature reheater 14 and export.
Embodiment 3:
See Fig. 4, other are the same, when adopting reheater steam, high temperature steam air heater 8 steam is from Low Temperature Reheater 13 outlet vapor, after high temperature steam air heater 8 heat exchange, steam can return to that 2# is high adds 10, high 10 steam source that add of former 2# are in high cylinder steam discharge 13, and now this steam is sent into boiler and heated together with cold steam again: its part adds the boiler reheater steam of 11 for 1# is high, and a part is for high temperature steam air heater 8 and 2# is high adds 10 and use steam.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (8)
1. one kind is improved the system of boiler using brown coal pulverized coal preparation system drying capacity, it is characterized in that: comprise air preheater, described air preheater is provided with cold First air entrance and heat primary air outlet, cold Secondary Air entrance and the outlet of hot Secondary Air, smoke inlet and exhanst gas outlet thereof, also be furnished with high temperature steam air heater in the heat primary air air channel of the heat primary air outlet of described air preheater, described high temperature steam air heater adopts Steam Heating.
2. the system improving boiler using brown coal pulverized coal preparation system drying capacity as claimed in claim 1, is characterized in that: the steam of described high temperature steam air heater, from extracted steam from turbine, is directly sent back in corresponding Steam Turbine Regenerative System after the heat exchange of described high temperature steam air heater.
3. the system improving boiler using brown coal pulverized coal preparation system drying capacity as claimed in claim 2, it is characterized in that: the steam of described high temperature steam air heater is after the heat exchange of high temperature steam air heater, after being heated by the heating surface be arranged in boiler, then send back in corresponding Steam Turbine Regenerative System.
4. the system improving boiler using brown coal pulverized coal preparation system drying capacity as claimed in claim 1, is characterized in that: the steam of described high temperature steam air heater is from boiler reheater, and after the heat exchange of described high temperature steam air heater, steam returns to high temperature reheater entrance.
5. the system improving boiler using brown coal pulverized coal preparation system drying capacity as claimed in claim 1, is characterized in that: the steam of described high temperature steam air heater is from boiler reheater, and after the heat exchange of described high temperature steam air heater, steam returns to high temperature reheater outlet.
6. the system of the raising boiler using brown coal pulverized coal preparation system drying capacity as described in claim 4 or 5, is characterized in that: the steam of described high temperature steam air heater is from Low Temperature Reheater outlet vapor.
7. the system improving boiler using brown coal pulverized coal preparation system drying capacity as claimed in claim 1, it is characterized in that: the high cylinder steam discharge of steam turbine high-pressure cylinder all enters Low Temperature Reheater, the steam of described high temperature steam air heater is from described Low Temperature Reheater outlet vapor.
8. the system improving boiler using brown coal pulverized coal preparation system drying capacity as claimed in claim 7, it is characterized in that: the steam after the heat exchange of described high temperature steam air heater returns to the second high-pressure heater, and with the second high-pressure heater steam, and the boiler reheater steam entering the first high-pressure heater together send into boiler heating.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106402915A (en) * | 2016-11-22 | 2017-02-15 | 上海交通大学 | Method and mechanism for increasing temperature of primary air of boiler pulverizing system |
| CN106524127A (en) * | 2016-11-27 | 2017-03-22 | 冯伟忠 | Steam cooler system and method for decreasing steam-extraction superheat degree of steam cooler system |
| CN107504512A (en) * | 2017-08-04 | 2017-12-22 | 上海发电设备成套设计研究院有限责任公司 | A kind of hot primary wind heating system for being used to dry pulverized coal preparation system |
| CN110332718A (en) * | 2019-07-17 | 2019-10-15 | 哈尔滨锅炉厂有限责任公司 | Utilize the system of groove type solar conduction oil collection hot working fluid heating coal-fired boiler hot primary wind |
| CN113324332A (en) * | 2020-02-28 | 2021-08-31 | 国家能源投资集团有限责任公司 | Air temperature regulating and controlling system for powder process system, powder process system and boiler system |
| CN113757642A (en) * | 2021-09-30 | 2021-12-07 | 中电投东北能源科技有限公司 | Blending combustion method for blending combustion of low-ash high-melting-point high-sulfur lignite in pulverized coal boiler fuel |
-
2015
- 2015-03-24 CN CN201520167580.3U patent/CN204554865U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106402915A (en) * | 2016-11-22 | 2017-02-15 | 上海交通大学 | Method and mechanism for increasing temperature of primary air of boiler pulverizing system |
| CN106524127A (en) * | 2016-11-27 | 2017-03-22 | 冯伟忠 | Steam cooler system and method for decreasing steam-extraction superheat degree of steam cooler system |
| CN107504512A (en) * | 2017-08-04 | 2017-12-22 | 上海发电设备成套设计研究院有限责任公司 | A kind of hot primary wind heating system for being used to dry pulverized coal preparation system |
| CN110332718A (en) * | 2019-07-17 | 2019-10-15 | 哈尔滨锅炉厂有限责任公司 | Utilize the system of groove type solar conduction oil collection hot working fluid heating coal-fired boiler hot primary wind |
| CN113324332A (en) * | 2020-02-28 | 2021-08-31 | 国家能源投资集团有限责任公司 | Air temperature regulating and controlling system for powder process system, powder process system and boiler system |
| CN113757642A (en) * | 2021-09-30 | 2021-12-07 | 中电投东北能源科技有限公司 | Blending combustion method for blending combustion of low-ash high-melting-point high-sulfur lignite in pulverized coal boiler fuel |
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