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Two-stage smoke-gas-air heat-exchanger system applied to thermal power plant

A flue gas heat exchanger and air heat exchanger technology, applied in lighting and heating equipment, combustion methods, indirect carbon dioxide emission reduction and other directions, can solve problems such as reducing steam turbine exhaust parameters, single function, and increasing unit construction and maintenance costs.

Inactive Publication Date: 2012-01-11
CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, every time the steam temperature and pressure increase by a step, boilers and steam turbines need to use materials with higher thermal strength and corrosion resistance, which greatly increases the construction and maintenance costs of the unit
(2) Reduce the exhaust steam parameters of the steam turbine
[0008] To sum up, the existing flue gas heat exchanger schemes all use a first-stage flue gas heat exchanger or a flue gas-air heat exchanger. The function is relatively simple

Method used

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  • Two-stage smoke-gas-air heat-exchanger system applied to thermal power plant
  • Two-stage smoke-gas-air heat-exchanger system applied to thermal power plant
  • Two-stage smoke-gas-air heat-exchanger system applied to thermal power plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0135] Embodiment 1 (corresponding to the schematic diagram attached image 3 , attached Figure 4 , image 3 for direct heat exchangers, Figure 4 for indirect heat exchangers)

[0136] After the flue gas produced by the combustion of the boiler 100 passes through the air preheater 2, its temperature is generally between 110°C and 170°C according to the type of the boiler and the type of coal fired. After the flue gas passes through the first-stage flue gas-air heat exchanger 31, the temperature drops to about 10°C above the acid dew point temperature of the flue gas. The first-stage flue gas-air heat exchanger 31 uses the air entering the boiler to absorb the temperature of the flue gas. The flue gas comes from the boiler flue gas at the outlet of the air preheater, and the air comes from the cold air at the outlet of the second-stage flue gas-air heat exchanger 32 . After the flue gas passes through the first-stage flue gas-air heat exchanger 31, it enters the flue gas...

Embodiment 2

[0139] Embodiment 2 (corresponding to the schematic diagram attached Figure 5 , attached Image 6 , Figure 5 for direct heat exchangers, Image 6 for indirect heat exchangers)

[0140] After the flue gas generated by the combustion of the boiler passes through the air preheater 2, its temperature is generally between 110°C and 170°C according to the type of the boiler and the type of coal fired. After the flue gas passes through the first-stage flue gas-water heat exchanger 31, the temperature drops to about 10°C above the acid dew point temperature of the flue gas. The flue gas comes from the boiler flue gas at the outlet of the air preheater 2, and the water source can be the condensed water in the condensate water system of the steam turbine, that is, from the outlet of a certain stage of low-pressure heater 7 or the outlet of several stages of low-pressure heaters and aggregated, the condensed water After absorbing heat through the first-stage flue gas-water heat exc...

Embodiment 3

[0143] Embodiment 3 (corresponding to the schematic diagram attached Figure 7 , attached Figure 8 , Figure 7 for direct heat exchangers, Figure 8 for indirect heat exchangers)

[0144] After the flue gas produced by the combustion of the boiler 100 passes through the air preheater 2, its temperature is generally between 110°C and 170°C according to the type of the boiler and the type of coal fired. After the flue gas passes through the first-stage flue gas-air heat exchanger 31, the temperature drops to about 10°C above the acid dew point temperature of the flue gas. The first-stage flue gas-air heat exchanger 31 uses the air entering the boiler to absorb the temperature of the flue gas. The flue gas comes from the boiler flue gas at the outlet of the air preheater, the air comes from the cold secondary air at the outlet of the blower, and the cold primary air at the outlet of the primary fan can also be used. After the flue gas passes through the first-stage flue gas...

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Abstract

The invention provides a two-stage smoke-gas-air heat-exchanger system applied to a thermal power plant, which comprises a boiler unit, a smoke-gas residual-heat utilizing unit, a smoke-gas dust-removing unit and a smoke-gas desulfurizing unit, wherein the boiler unit is used for discharging smoke gas, and the smoke-gas residual-heat utilizing unit comprises a preheater, a first-stage smoke-gas heat exchanger and a second smoke-gas heat exchanger; the first-stage smoke-gas heat exchanger is arranged between the preheater and the smoke-gas dust-removing unit, and the second smoke-gas heat exchanger is arranged at an inlet of the smoke-gas desulfurizing unit; both the first-stage smoke-gas heat exchanger and the second smoke-gas heat exchanger are smoke-gas-air heat exchangers; or, the first-stage smoke-gas heat exchanger is a smoke-gas-water heat exchanger, a water source at a condensed-water side is condensed water in a steam-turbine condensed-water system, and the second smoke-gas heat exchanger is the smoke-gas-air heat exchanger; or, the first-stage smoke-gas heat exchanger is the smoke-gas-air heat exchanger, the second smoke-gas heat exchanger is the smoke-gas-water heat exchanger, and the water source at the condensed-water side is the condensed water in the steam-turbine condensed-water system.

Description

technical field [0001] The invention relates to an environment-friendly and energy-saving device, and more particularly to a flue gas waste heat utilization system for comprehensive optimization of flue gas used in thermal power plants to reduce smoke and dust emissions, improve desulfurization efficiency and save water consumption. Background technique [0002] With the development of the national economy, the society's demand for electricity is constantly increasing. For emerging developing countries that are undergoing industrialization and rapid economic development, such as China, the consumption of electricity and the installed capacity of power plants are increasing rapidly. For China, due to the limitation of its primary energy storage variety and storage capacity, coal is the main fuel for power plants in recent decades, reaching more than 70%, and this trend will not be seen in the foreseeable future. fundamental change. Although coal-fired thermal power plants h...

Claims

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Application Information

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IPC IPC(8): F23L15/00
CPCY02E20/34
Inventor 叶勇健施刚夜林磊申松林
Owner CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST
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