System for concentrating wastewater by heating via low-temperature flue gas

A technology for wastewater concentration and low-temperature flue gas, which is applied in heating water/sewage treatment, gaseous discharge wastewater treatment, lighting and heating equipment, etc. Improve condensation effect and solve the effect of consuming high-quality heat energy

Pending Publication Date: 2019-12-31
CHINA HUADIAN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of high-quality heat energy consumption and high energy consumption in the existing desulfurization wastewater concentration technology, so as to provide a low-temperature flue gas heating wastewater concentration system

Method used

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  • System for concentrating wastewater by heating via low-temperature flue gas
  • System for concentrating wastewater by heating via low-temperature flue gas
  • System for concentrating wastewater by heating via low-temperature flue gas

Examples

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Embodiment 1

[0067] This embodiment provides a low-temperature flue gas heating wastewater concentration system, such as figure 1 As shown, it includes a dust removal unit 1 and a desulfurization unit 2 connected together, and also includes an economizer 3 and a wastewater concentration system. The economizer 3 is arranged between the dust removal unit 1 and the desulfurization unit 2, or is arranged along the direction of flue gas flow. Before dust removal unit 1; dust removal unit 1 is an electric dust collector, desulfurization unit 2 is a desulfurization tower, and economizer 3 is a low-temperature economizer. The setting of economizer 3 can improve the dust removal capacity of dust removal unit 1.

[0068] Such as figure 2 As shown, the waste water concentration system includes: a first heat exchanger 6, which communicates with the economizer 3, so that the waste water and the first heat exchange medium from the economizer 3 exchange heat in the first heat exchanger 6; the first The...

Embodiment 2

[0094] Such as figure 1 As shown, this embodiment provides a low-temperature flue gas heating wastewater concentration system, which includes a connected dust removal unit 1, a desulfurization unit 2, and a chimney 4, and also includes an economizer 3 and a wastewater concentration system. The economizer 3 is arranged on the dust removal unit Between unit 1 and desulfurization unit 2; dedusting unit 1 is an electric precipitator, desulfurization unit 2 is a desulfurization tower, and economizer 3 is a low-low temperature economizer; the wastewater concentration system includes:

[0095] The first heat exchanger 6 communicates with the economizer 3, so that the waste water and the first heat exchange medium from the economizer 3 exchange heat in the first heat exchanger 6;

[0096] Flash tank 7, such as Figure 9 As shown, a first partition 7-4 and a second partition 7-5 are arranged inside, along the direction from the liquid inlet 7-11 to the liquid outlet 7-12 of the flash ...

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Abstract

The invention provides a system for concentrating wastewater by heating via low-temperature flue gas. Multi-grade flashing is realized by using gradient vacuum through a flash tank, so that the concentration effect of desulfurization wastewater is increased; meanwhile, steam with different temperature, formed by the multi-grade flashing, enters communicated sub shell sides respectively, and is subjected to cascaded heat exchange with a secondary heat exchange medium, so that the heat exchange effect is improved; a second heat exchanger is of a tube-shell type structure, and a plurality of subshell sides are adopted, so that the complexity of the structure of the second heat exchanger and the connection of the shell sides is reduced while the condensation effect of the steam can be improved, and furthermore, the investment cost and construction period of system equipment are reduced; after the temperature of the wastewater is improved, the residual heat of the flue gas participates inwastewater flashing; and then the residual heat of the flue gas is further recycled by the second heat exchange medium after being brought out by the steam, and then returns to a low-temperature heating system. In the case that recycled heat is nearly not lost, the application of the heat is widened, and cascaded utilization of the heat is realized; and the disadvantage of a conventional route that high-quality heat is consumed is overcome and the energy consumption of units is reduced.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a low-temperature flue gas heating wastewater concentration system. Background technique [0002] China's power energy is dominated by coal resources. With the increase of thermal power installed capacity, sulfur dioxide has become the main source of air pollution. Flue gas desulfurization (FGD) is the main process of industrial desulfurization. Among them, the wet limestone washing process has become the most common flue gas desulfurization technology because of its high desulfurization efficiency, good adaptability to coal types, mature process and reliable operation. However, desulfurization wastewater will be produced during the desulfurization process. The water quality and quantity characteristics of desulfurization wastewater are related to many factors such as unit load, coal composition, operating conditions, desulfurization process water quality, and li...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F1/06C02F1/16F28D21/00C02F103/18
CPCC02F1/06C02F1/048C02F1/043C02F1/16F28D21/0001C02F2001/007C02F2201/002C02F2103/18
Inventor 王争荣汪洋胡小夫苏军划夏怀鹏耿宣
Owner CHINA HUADIAN ENG
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