CN212901472U - Biomass blending combustion system based on flue gas recirculation of coal-fired power plant - Google Patents
Biomass blending combustion system based on flue gas recirculation of coal-fired power plant Download PDFInfo
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- CN212901472U CN212901472U CN202021631175.XU CN202021631175U CN212901472U CN 212901472 U CN212901472 U CN 212901472U CN 202021631175 U CN202021631175 U CN 202021631175U CN 212901472 U CN212901472 U CN 212901472U
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Abstract
The utility model discloses a biomass blending combustion system based on flue gas recirculation of a coal-fired power plant, which comprises a blending combustion system draught fan, a biomass fuel storage bin, a conveying device and a biomass crusher; an inlet of the mixed combustion system induced draft fan is communicated with a flue gas outlet of the boiler system, and an outlet of the mixed combustion system induced draft fan is connected with a fuel inlet of the boiler system; the biomass crusher comprises a crushing equipment box, a pair-twisted gear, a conveying device and a pair-twisted gear, wherein the pair-twisted gear is arranged in the crushing equipment box and is arranged on the same horizontal line, one pair-twisted gear is arranged at an included angle relative to the other pair-twisted gear in a self-rotating mode, a top inlet formed in the top of the crushing equipment box is located between the pair-twisted gears, the top inlet is connected with an outlet of the conveying device, and an inlet of the conveying device is communicated with an outlet of a biomass fuel storage bin; the bottom of the crushing equipment box body is provided with a bottom outlet, the bottom outlet is provided with an air locking mechanism, and the bottom outlet is communicated with a passage from an outlet of an induced draft fan of the blending combustion system to a fuel inlet of a boiler system.
Description
Technical Field
The utility model belongs to the field, concretely relates to living beings mix system of burning based on coal fired power plant flue gas recirculation.
Background
Biomass is widely recognized as a CO2The fuel with near zero emission, however, because of the high content of potassium and chlorine in the biomass fuel, serious slag bonding and corrosion can be generated by direct combustion, and the safe operation of the boiler is threatened. If the biomass and the coal powder are mixed and burned in a small proportion, the problem can be eliminated. The biomass is high in volatile content, low in ash content, low in ignition point and easy to deflagrate, and the traditional blending combustion process is mainly characterized in that cold air (30-60 ℃) is blown into a boiler burner through a boiler powder making system. The method has the advantages that the temperature of the cold air is low, the combustion of the boiler is easily influenced greatly, and the efficiency of the boiler is further reduced. Meanwhile, coal mills in a boiler pulverizing system are mainly roll mills, steel ball mills and fan mills, are mainly used for crushing coal fired in a power plant, and have poor adaptability to biomass fuels with weak rigidity, large power consumption and small treatment capacity in the crushing process and have poor economy.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a biomass blending system based on coal fired power plant flue gas recirculation utilizes pair twist gear mechanical structure to realize living beings wooden material's high-efficient breakage, helps coal fired boiler flue gas waste heat to carry biomass fuel after the breakage to burn the mode through the flue gas recirculation and realize living beings clean processing useless admittedly.
In order to achieve the above purpose, the utility model adopts the technical scheme that: a biomass blending combustion system based on flue gas recirculation of a coal-fired power plant comprises a blending combustion system induced draft fan, a biomass fuel storage bin, a conveying device and a biomass crusher;
an inlet of the mixed combustion system induced draft fan is communicated with a flue gas outlet of the boiler system, and an outlet of the mixed combustion system induced draft fan is connected with a fuel inlet of the boiler system; the biomass crusher adopts a pair-twisted gear type crusher, the pair-twisted gears are arranged in a crushing equipment box body and are arranged on the same horizontal line, one pair-twisted gear is arranged at an included angle relative to the other pair-twisted gear in a self-rotating mode, a top inlet formed in the top of the crushing equipment box body is located between the pair-twisted gears and is connected with an outlet of a conveying device, and an inlet of the conveying device is communicated with an outlet of a biomass fuel storage bin; the bottom of the crushing equipment box body is provided with a bottom outlet, the bottom outlet is provided with an air locking mechanism, and the bottom outlet is communicated with a passage from an outlet of an induced draft fan of the blending combustion system to a fuel inlet of a boiler system.
The boiler system comprises a power station boiler, an air preheater and a smoke dust separator, wherein the air preheater is arranged in a tail flue of the power station boiler, an inlet of the smoke dust separator is communicated with the air preheater, and an outlet of the smoke dust separator is used as a smoke outlet of the boiler system to be communicated with an inlet of an induced draft fan of the mixed combustion system.
The inlet and the outlet of the air preheater are respectively communicated with the inlet of the smoke dust separator, and the channels from the inlet and the outlet of the air preheater to the inlet of the smoke dust separator are respectively provided with a flow regulating valve.
Communicating an OFA air port of an existing boiler furnace of the power station boiler with an outlet of an induced draft fan of the co-combustion system, or providing a biomass fuel inlet on the power station boiler and communicating with an outlet of the induced draft fan of the co-combustion system.
The bottom outlet adopts a funnel type discharge port, and a maintenance window is arranged at the bottom outlet and is normally closed.
And a temperature sensor and a pressure sensor are arranged on a flue gas channel from the outlet of the smoke dust separator to the inlet of a draught fan of the co-combustion system.
And a pressure sensor and a flow sensor are arranged on a channel from the bottom outlet to the fuel inlet of the boiler system.
And a blowing port is formed at the outlet of the bottom and is connected with a fan.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
the utility model provides biomass blending combustion equipment and process based on flue gas recirculation conveying, which utilize a pair of twisted gear mechanical structure to realize the high-efficiency crushing of biomass wood materials, are beneficial to conveying crushed biomass fuel by flue gas waste heat of a coal-fired boiler, and realize the clean treatment of biomass solid waste by a flue gas recirculation combustion mode; the deflagration phenomenon of living beings in transportation process helps to prevent, can not produce great influence to boiler efficiency again, also need not pass through original boiler powder process system, can also realize the low nitrogen of flue gas recirculation and reform transform the effect simultaneously.
Drawings
FIG. 1 is a schematic diagram of a biomass blending combustion process based on flue gas recirculation conveying.
Fig. 2 is the utility model discloses a novel pair gear formula breaker equipment schematic diagram.
In the attached drawing, 1-a power station boiler, 2-an air preheater, 3-a smoke dust separation device, 4-a mixed combustion system induced draft fan, 5-a biomass fuel storage bin, 6-a conveying device, 7-a biomass crusher, 8-a feeding port, 9-a top inlet, 10-a crushing equipment box body, 11-a symmetrical gear, 12-a bottom outlet and 13-a gas locking structure.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, a biomass co-combustion system based on flue gas recirculation of a coal-fired power plant comprises a co-combustion system induced draft fan 4, a biomass fuel storage bin 5, a conveying device 6 and a biomass crusher 7; an inlet of the mixed combustion system induced draft fan 4 is communicated with a flue gas outlet of the boiler system, and an outlet of the mixed combustion system induced draft fan 4 is connected with a fuel inlet of the boiler system; the biomass crusher 7 adopts a pair-twisted gear type crusher, the pair-twisted gears 11 are arranged in a crushing equipment box body 10, the pair-twisted gears 11 are arranged on the same horizontal line, one pair-twisted gear is arranged at an included angle relative to the other pair-twisted gear in a self-rotating mode, a top inlet 9 formed in the top of the crushing equipment box body 10 is positioned between the pair-twisted gears 11, the top inlet 9 is connected with an outlet of the conveying device 6, and an inlet of the conveying device 6 is communicated with an outlet of the biomass fuel storage bin 5; the bottom of the crushing equipment box body 10 is provided with a bottom outlet 12, the bottom outlet is provided with an air locking mechanism 13, and the bottom outlet 12 is communicated with a passage from an outlet of an induced draft fan 4 of the blending combustion system to a fuel inlet of a boiler system.
The boiler system comprises a power station boiler 1, an air preheater 2 and a smoke dust separator 3, wherein the air preheater 2 is arranged at a tail flue of the power station boiler 1, an inlet of the smoke dust separator 3 is communicated with the air preheater 2, and an outlet of the smoke dust separator 3 is used as an inlet of a smoke outlet communicated with a draught fan 4 of the mixed combustion system of the boiler system.
The inlet and the outlet of the air preheater 2 are respectively communicated with the inlet of the smoke dust separator 3, and the channels from the inlet and the outlet of the air preheater 2 to the inlet of the smoke dust separator 3 are respectively provided with a flow regulating valve.
And communicating an OFA air port 8 of an existing boiler furnace of the power station boiler 1 with an outlet of an induced draft fan 4 of the co-combustion system, or providing a biomass fuel inlet on the power station boiler and communicating with an outlet of the induced draft fan 4 of the co-combustion system.
The bottom outlet 12 adopts a funnel type discharge port, a maintenance window is arranged at the bottom outlet 12, and the maintenance window is normally closed.
And a temperature sensor and a pressure sensor are arranged on a flue gas channel from the outlet of the smoke dust separator 3 to the inlet of a draught fan 4 of the co-combustion system.
A pressure sensor and a flow sensor are provided on the passage from the bottom outlet 12 to the fuel inlet of the boiler system.
Extracting medium-high temperature flue gas from an inlet and an outlet of a flue air preheater 2 at the tail part of a power station boiler 1, and sending the flue gas into an outlet of a biomass crusher 7 through a flue dust separator 3;
biomass fuel is conveyed into an inlet of a biomass crusher 7 from a storage bin 5 through a conveying device 6, and the biomass fuel is carried and conveyed by flue gas after being crushed.
The biomass crusher 7 adopts a reel type structure, can adopt a single reel or a double reel, and also can adopt a roller coal mill, the utility model adopts a pair-reel type crusher device, as shown in figure 2, biomass fuel falls into a crushing device box body 10 from a top inlet, the angles of blades of a pair-reel gear 11 are different, and the double reels arranged in an axially staggered way fall into a smoke channel below from a bottom outlet after being crushed, and are carried and conveyed by smoke;
rubbing crusher and flue gas pipeline junction need set up the gas locking mechanism, prevents in the flue gas anti-cluster to crushing apparatus, and the wearing and tearing equipment threatens the operation safety.
Referring to fig. 1, in the implementation process of recycling the flue gas based on the biomass dye by using the system of the present invention, the flue gas carrying the crushed biomass fuel is finally sent to the OFA tuyere 8 of the boiler furnace for recycling and reburning;
the temperature of the flue gas extracted from the air preheater 2 is controlled to be 200-250 ℃, the flue gas is extracted from an outlet (the temperature is generally 130-150 ℃) of the air preheater and an inlet (the temperature is generally 300-350 ℃) of the air preheater and then is mixed, and a power source for extracting the flue gas is a draught fan arranged in a blending combustion system; because the extracted flue gas does not enter a power station dust removal device, the dust content of the flue gas is high, the flue gas is easy to wear a pipeline or related equipment, a smoke dust separator 3 is additionally arranged, the flue gas passes through the smoke dust separator 3 to remove part of dust in the flue gas, the equipment failure rate is reduced, and the removed dust can be pneumatically conveyed to a dust warehouse or the power station dust removal device; the oxygen content in the flue gas of the tail flue of the power station boiler is not more than 4%, the biomass is not in contact with the flue gas, the deflagration risk is avoided, the temperature is controlled not to be more than 300 ℃, and the biomass volatilization analysis output is small.
Compared with sludge, the biomass fuel has no peculiar smell and small density, and is stored in a coal shed or a warehouse, and the conveying device 6 adopts a commercially available product.
The air locking mechanism adopts an air locking device.
After being crushed, the biomass is conveyed into a hearth for combustion through flue gas, an upper secondary air port, a limestone inlet in a furnace or an OFA air port can be selected as a feeding port of the biomass, and a biomass feeding port can also be additionally arranged on a boiler.
For a pulverized coal boiler, if the crushed biomass particles are larger, the burnout effect can be influenced, the particle size of the biomass particles is not more than 8mm, and the particle size of the circulating fluidized bed boiler is not more than 100 mm.
Claims (8)
1. A biomass co-combustion system based on flue gas recirculation of a coal-fired power plant is characterized by comprising a co-combustion system induced draft fan (4), a biomass fuel storage bin (5), a conveying device (6) and a biomass crusher (7);
an inlet of the mixed combustion system induced draft fan (4) is communicated with a flue gas outlet of the boiler system, and an outlet of the mixed combustion system induced draft fan (4) is connected with a fuel inlet of the boiler system; the biomass crusher (7) is a pair-twisted gear type crusher, the pair-twisted gears (11) are arranged in a crushing equipment box body (10), the pair-twisted gears (11) are arranged on the same horizontal line, one pair-twisted gear is arranged at an included angle relative to the other pair-twisted gear in a self-rotating mode, a top inlet (9) formed in the top of the crushing equipment box body (10) is located between the pair-twisted gears (11), the top inlet (9) is connected with an outlet of the conveying device (6), and an inlet of the conveying device (6) is communicated with an outlet of the biomass fuel storage bin (5); the bottom of the crushing equipment box body (10) is provided with a bottom outlet (12), the bottom outlet is provided with an air locking mechanism (13), and the bottom outlet (12) is communicated with a channel from an outlet of an induced draft fan (4) of the co-combustion system to a fuel inlet of a boiler system.
2. The biomass co-combustion system based on the flue gas recirculation of the coal-fired power plant as recited in claim 1, wherein the boiler system comprises a power station boiler (1), an air preheater (2) and a smoke dust separator (3), the air preheater (2) is arranged in a tail flue of the power station boiler (1), an inlet of the smoke dust separator (3) is communicated with the air preheater (2), and an outlet of the smoke dust separator (3) is used as a flue gas outlet of the boiler system to be communicated with an inlet of a draught fan (4) of the co-combustion system.
3. The biomass co-combustion system based on the flue gas recirculation of the coal-fired power plant as recited in claim 2, wherein an inlet and an outlet of the air preheater (2) are respectively communicated with an inlet of the soot separator (3), and channels from the inlet and the outlet of the air preheater (2) to the inlet of the soot separator (3) are respectively provided with a flow regulating valve.
4. The biomass co-combustion system based on the flue gas recirculation of the coal-fired power plant as recited in claim 2, characterized in that an OFA air port (8) of an existing boiler furnace of the utility boiler (1) is communicated with an outlet of a draught fan (4) of the co-combustion system, or a biomass fuel inlet arranged on the utility boiler is communicated with an outlet of the draught fan (4) of the co-combustion system.
5. The biomass co-combustion system based on the flue gas recirculation of the coal-fired power plant as recited in claim 1, wherein the bottom outlet (12) is a funnel-type discharge port, a maintenance window is opened at the bottom outlet (12), and the maintenance window is normally closed.
6. The biomass co-combustion system based on the flue gas recirculation of the coal-fired power plant as recited in claim 1, wherein a temperature and pressure sensor is arranged on a flue gas channel from an outlet of the smoke dust separator (3) to an inlet of an induced draft fan (4) of the co-combustion system.
7. The biomass co-combustion system based on flue gas recirculation of a coal-fired power plant as recited in claim 1, characterized in that a pressure sensor and a flow sensor are arranged on a passage from the bottom outlet (12) to the fuel inlet of the boiler system.
8. The biomass co-combustion system based on flue gas recirculation of a coal-fired power plant as recited in claim 1, wherein a blowing port is provided at the bottom outlet, and the blowing port is connected with a fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021631175.XU CN212901472U (en) | 2020-08-07 | 2020-08-07 | Biomass blending combustion system based on flue gas recirculation of coal-fired power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021631175.XU CN212901472U (en) | 2020-08-07 | 2020-08-07 | Biomass blending combustion system based on flue gas recirculation of coal-fired power plant |
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| CN212901472U true CN212901472U (en) | 2021-04-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113864751A (en) * | 2021-09-24 | 2021-12-31 | 武汉蓝颖新能源有限公司 | Anti-scald biomass boiler for industrial steam supply based on hot gas diversion |
| CN114308335A (en) * | 2021-12-14 | 2022-04-12 | 湖州霞幕山生态农林发展有限公司 | Utilize device of gardens discarded object environmental protection processing domestic sludge |
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2020
- 2020-08-07 CN CN202021631175.XU patent/CN212901472U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113864751A (en) * | 2021-09-24 | 2021-12-31 | 武汉蓝颖新能源有限公司 | Anti-scald biomass boiler for industrial steam supply based on hot gas diversion |
| CN114308335A (en) * | 2021-12-14 | 2022-04-12 | 湖州霞幕山生态农林发展有限公司 | Utilize device of gardens discarded object environmental protection processing domestic sludge |
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