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Efficient garbage power generation system coupled with coal-fired power plant

A technology for waste-to-energy and coal-fired power plants, applied in the control system, joint combustion mitigation, and combustion methods, etc., can solve the problems that are easy to cause environmental problems and cannot effectively remove dioxins and heavy metals from waste furnaces, and increase the unit of waste-to-energy Quantity, improve the efficiency of garbage furnace, good effect of system economy

Pending Publication Date: 2021-02-05
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing garbage-coupled coal-fired unit power generation technology does not fully consider the difference between the garbage furnace and the coal-fired boiler flue gas purification system. Dioxins and heavy metals in the tail gas are likely to cause environmental problems

Method used

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  • Efficient garbage power generation system coupled with coal-fired power plant
  • Efficient garbage power generation system coupled with coal-fired power plant
  • Efficient garbage power generation system coupled with coal-fired power plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In this embodiment, the high-efficiency waste-to-energy system coupled with coal-fired power plants is as follows: figure 1 As shown, it includes waste incineration boiler 1, metering unit 2, coal-fired boiler 3, steam turbine 4, generator 5, flue gas pretreatment unit 6, flue gas purification unit 7, chimney 8, air preheating unit 9 and other components.

[0052] The design parameters of waste incineration boiler 1 are 2*400t / d, 2000Kcal / kg, medium temperature and high pressure, and the coal-fired unit is a conventional 350MW subcritical unit.

[0053] Along the direction of air / flue gas flow, the air preheating unit 9, the waste incineration boiler 1, the flue gas pretreatment unit 6, the flue gas purification unit 7 and the chimney 8 are connected in sequence. Along the direction of steam flow, waste incineration boiler 1, metering unit 2, coal-fired boiler 3, and power generation unit are connected in sequence. The main steam generated by waste incineration boiler 1...

Embodiment 2

[0060] This embodiment provides a high-efficiency waste-to-energy system coupled with a coal-fired power plant similar to Embodiment 1.

[0061] The difference between this example and Example 1 is that the acid dew point of the raw flue gas in this example is 115°C, so the exhaust gas temperature in the design working condition drops to 140°C, and the waste heat of the flue gas can be further recovered. In the flue gas pretreatment unit 6 The dry deacidification subunit can be canceled or kept normally closed to save operating costs.

Embodiment 3

[0063] This embodiment provides a high-efficiency waste-to-energy system coupled with a coal-fired power plant similar to Embodiment 1.

[0064] The difference between this embodiment and Embodiment 1 is that the air preheating unit 9 is changed to extract steam from the low re-entrance of the coal-fired boiler 3, and the transformation of the steam side of the coal-fired unit is controlled within the coal-fired boiler 3. In the coal-fired unit The steam turbine 4 does not need to be modified.

[0065] The effect comparison between the present invention and the prior art is shown in Table 1 below.

[0066] Table 1 The present invention and the effect contrast of prior art

[0067]

[0068] In summary, the high-efficiency waste-to-energy system coupled with coal-fired power plants of the present invention has the advantages of high unit waste-to-power generation, excellent environmental protection indicators, simple system configuration, and low initial investment compared ...

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Abstract

The invention discloses an efficient garbage power generation system coupled with a coal-fired power plant. The system comprises a coal-fired boiler; a waste incineration boiler, wherein main steam generated by the waste incineration boiler is converged into the coal-fired boiler and mixed with main steam generated by the coal-fired boiler to be output, smoke generated by the waste incineration boiler and smoke generated by the coal-fired boiler are mixed to serve as total smoke to be output, and the smoke exhaust temperature of the waste incineration boiler is set to range from 140 DEG C to 160 DEG C; a power generation unit, wherein the power generation unit utilizes the steam output by the coal-fired boiler to do work to generate power; a flue gas pretreatment unit used for carrying outpretreatment on flue gas generated by the waste incineration boiler; a flue gas purification unit used for purifying the total flue gas and discharging the purified flue gas; and an air preheating unit, wherein the air preheating unit is used for heating cold air and providing hot air for the waste incineration boiler, and the air preheating unit is of a two-section type heating structure with single-section steam extraction. The efficiency of the garbage boiler can be improved, the generating capacity is increased, and the overall environmental protection index and economy of the system areimproved.

Description

technical field [0001] The invention relates to the technical field of waste incineration treatment, and more specifically relates to a high-efficiency waste power generation system coupled with a coal-fired power plant. Background technique [0002] With the improvement of people's living standards and the sharp increase in the output of municipal solid waste, the trend of garbage siege continues to amplify. Waste incineration power generation technology represented by grate and CFB boiler has developed into a mainstream technology for harmless treatment of waste due to its small footprint, significant reduction in volume, and high resource utilization. [0003] Most of the existing technologies use newly built waste incineration power plants to deal with the waste in a certain surrounding area. However, due to the demand for flue gas purification on the temperature of the flue gas, the exhaust gas temperature of the waste furnace is usually around 190°C, and the heat loss ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B33/18F22B35/00F23J15/00F23J15/06F23L15/00F23G5/00F01D15/10F01K11/02
CPCF01D15/10F01K11/02F22B33/18F22B35/00F23G5/00F23J15/003F23J15/006F23J15/06F23L15/00Y02E20/12Y02E20/34
Inventor 许钞俊苏虎鲁佳易董康李灵均黄敏汪小继王诗行翟少栋邓启刚刘川川张文杰
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP