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Recycling device and method for low-grade waste heat of thermal power plant

A low-grade, thermal power plant technology, applied in the direction of preheating, feed water heaters, heat exchangers, etc., can solve the problem of 1.5-2.5% increase in steam consumption of the unit, and achieve the effect of improving heat dissipation, increasing thermal efficiency, and high efficiency

Pending Publication Date: 2018-04-03
浙江巨化热电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

General operating experience shows that the steam consumption of the unit will increase by 1.5-2.5% for every 1KPa decrease in the vacuum of the condenser

Method used

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  • Recycling device and method for low-grade waste heat of thermal power plant

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Experimental program
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Effect test

Embodiment 1

[0024] A device for recycling low-grade waste heat in a thermal power plant, comprising a cooling tower 4 and a circulating water pump 6 connected to the cooling tower 4, and a heat exchanger 3 is arranged inside the water tank of the cooling tower 4 (the heat exchange tube is a finned tube, and the specification is Countercurrent arrangement), the heat exchanger 3 is provided with a desalted water inlet, a desalted water outlet, a circulating water inlet pipe 7 and a circulating water outlet, the desalted water inlet is connected to the desalted water tank 1 through the desalted water pump 2, and the desalted water outlet is connected to the desalted water tank 1 through the deoxygenated Device 5 is connected with boiler 8.

[0025] The process of reusing the low-grade waste heat of thermal power plants using the above-mentioned device is as follows: desalted water (flow rate: 200t / h, initial temperature: 20°C) is pumped from desalted water tank 1 to heat exchanger 3, and thr...

Embodiment 2

[0028] A device for recycling low-grade waste heat in a thermal power plant, comprising a cooling tower 4 and a circulating water pump 6 connected to the cooling tower 4, and a heat exchanger 3 is arranged inside the water tank of the cooling tower 4 (the heat exchange tube is a finned tube, and the specification is Countercurrent arrangement), the heat exchanger 3 is provided with a desalted water inlet, a desalted water outlet, a circulating water inlet pipe 7 and a circulating water outlet, the desalted water inlet is connected to the desalted water tank 1 through the desalted water pump 2, and the desalted water outlet is connected to the desalted water tank 1 through the deoxygenated Device 5 is connected with boiler 8.

[0029] The process of using the above device to reuse low-grade waste heat in thermal power plants is as follows: desalted water (flow rate: 210t / h, initial temperature: 22°C) is sent to heat exchanger 3 through desalted water tank 1 by desalted water pu...

Embodiment 3

[0032] A device for recycling low-grade waste heat in a thermal power plant, comprising a cooling tower 4 and a circulating water pump 6 connected to the cooling tower 4, and a heat exchanger 3 is arranged inside the water tank of the cooling tower 4 (the heat exchange tube is a finned tube, and the specification is Countercurrent arrangement), the heat exchanger 3 is provided with a desalted water inlet, a desalted water outlet, a circulating water inlet pipe 7 and a circulating water outlet, the desalted water inlet is connected to the desalted water tank 1 through the desalted water pump 2, and the desalted water outlet is connected to the desalted water tank 1 through the deoxygenated Device 5 is connected with boiler 8.

[0033] The process of reusing the low-grade waste heat of thermal power plants using the above-mentioned device is as follows: desalted water (flow rate is 220t / h, initial temperature is 25°C) is sent to heat exchanger 3 through desalted water tank 1 by ...

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Abstract

The invention discloses a recycling device for low-grade waste heat of a thermal power plant. The device comprises a cooling tower and a circulating water pump connected with the cooling tower; a heatexchanger is arranged inside a water tank of the cooling tower and comprises a demineralized water inlet, a demineralized water outlet, a circulating water inlet pipe and a circulating water outlet;the demineralized water inlet is connected with a demineralized water tank through a demineralized water pump; and the demineralized water outlet is connected with a boiler through a de-aerator. The invention further discloses a method for recycling the low-grade waste heat of the thermal power plant by using the device. The device is simple in structure, high in efficiency, safe and environment-friendly, while demineralized water is heated by the aid of low-quality heat of circulating water in the cooling tower, the feed-water temperature of the boiler is increased and the heat efficiency ofthe boiler is improved, the heat dissipation effect of the cooling tower is improved, the temperature of the circulating water is reduced, the vacuum of a condenser is indirectly increased, the running stability of a unit is improved, and the effects of waste heat recovery, energy conservation, emission reduction and efficient recycling are achieved.

Description

technical field [0001] The invention relates to the technical field of energy saving and emission reduction, in particular to a low-grade waste heat recycling device and method of a thermal power plant. Background technique [0002] Coal-fired thermal power plants are the main enterprises in my country's electricity production, and 78% of the national electricity consumption comes from coal-fired thermal power plants. my country's energy consumption is dominated by coal, and nearly 2 billion tons of standard coal are mined for primary energy every year, which is equivalent to an industrial output value of about 1 trillion yuan, and nearly half of it is burned by thermal power plant boilers. Therefore, at this stage, coal-fired power plants comprehensively advocate energy-saving transformation, greatly reduce coal consumption for power generation, improve energy utilization, save energy and reduce emissions, so as to achieve clean and efficient development of the power indust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D1/00F28C1/14
CPCF22D1/00F28C1/14
Inventor 毛双华林国辉王浩添
Owner 浙江巨化热电有限公司
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