Water treatment device and method by using power plant waste heat

A technology for water treatment devices and waste heat in power plants, applied in seawater treatment, multi-stage water treatment, water/sewage treatment, etc. The effect of utilizing efficiency and reducing operating costs

Pending Publication Date: 2016-12-21
DATANG ENVIRONMENT IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since membrane distillation needs to heat the raw water, the energy consumption is relatively high, which is also one of the important factors that limit the large-scale application of the MD process.

Method used

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  • Water treatment device and method by using power plant waste heat

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Based on the method for water treatment using waste heat from a power plant by a water treatment device, taking desulfurization wastewater from a coal-fired power plant as a treatment object, the method includes the following steps:

[0043] Step 1, the desulfurization wastewater is pretreated by chemical precipitation, softening, flocculation and precipitation to remove pollutants such as heavy metals, suspended solids and hardness in the wastewater, and then enters the heating tank 2;

[0044] Step 2, in the exhausted steam discharged from the low pressure cylinder of the steam turbine, the exhausted steam enters the steam compressor 5 after being drawn out by the air extraction pump 4;

[0045]In step 3, the exhausted steam compressed by the steam compressor 5 is heated to 90°C and then enters the heat exchanger 6 in the heating pool 2, and the desulfurization wastewater in the heating pool 2 is heated by the heat exchanger 6, and the exhausted steam is condensed at t...

Embodiment 2

[0052] Based on the method for the water treatment device utilizing the waste heat of the power plant for water treatment, the seawater of a coastal coal-fired power plant is taken as the treatment object, and the seawater desalination treatment includes the following steps:

[0053] Step 1: First, the sea water is pumped into the conditioning tank, and then through pretreatment such as softening, flocculation sedimentation, filtration, etc., to remove pollutants such as suspended solids and hardness in the wastewater, and then enter the heating tank 2;

[0054] Step 2, in the exhausted steam discharged from the low pressure cylinder of the steam turbine, the exhausted steam enters the steam compressor 5 after being drawn out by the air extraction pump 4;

[0055] Step 3, the spent steam compressed by the steam compressor 5 is heated to 65°C and then enters the heat exchanger 6 in the heating pool 2, and the seawater in the heating pool 2 is heated by the heat exchanger 6, and ...

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Abstract

The invention relates to a water treatment device and method by using power plant waste heat. The water treatment device by using the power plant waste heat comprises a heating tank used for heating raw water, wherein a heat exchanger is arranged in the heating tank, a waste steam pipeline A is arranged outside the heating tank, a suction pump and a steam compressor are arranged on the waste steam pipeline A in sequence, waste steam enters the steam compressor through the suction pump, the air outlet of the steam compressor is connected with the air inlet of the heat exchanger, and the air outlet of the heat exchanger is connected with a boiler; the water treatment device further comprises a membrane distillation device, the water inlet of a hot side solution end of the membrane distillation device is connected with the water outlet of the heating tank, the water outlet of the hot side solution end of the membrane distillation device is connected with the water inlet B of the heating tank through a water pump, and the steam outlet of the membrane distillation device is connected with a water producing tank through a condenser. The water treatment device and method by using the power plant waste heat disclosed by the invention can effectively save water resources and realize energy recovery, and can further greatly reduce the operating cost of membrane distillation treatment, produce high-quality water and improve the heat utilization efficiency of a whole power plant.

Description

technical field [0001] The invention belongs to the field of energy saving and environmental protection, and in particular relates to a water treatment device and method for utilizing waste heat of a power plant. Background technique [0002] Coal-fired power generation occupies an important position in my country's energy supply. In order to ensure the power generation efficiency and the normal operation of the power generation equipment, a large amount of circulating cooling water is usually required to cool the exhausted steam of the steam turbine, and the heat in the exhausted steam is brought into the atmosphere through the volatilization of water, which not only wastes a lot of heat, but also consumes a lot of heat every day. Tens of thousands of tons of water resources, therefore, how to recycle the heat in the exhausted steam has always been a key research field in the field of energy conservation. [0003] Membrane distillation (MD) technology is a high-efficiency ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44C02F9/10C02F9/14C02F103/08
CPCC02F1/447C02F9/00C02F1/72C02F1/52C02F3/00C02F1/001C02F1/40C02F2301/08C02F2103/08C02F5/00C02F1/44
Inventor 刘海洋夏怀祥江澄宇齐勇郭清温郭永红
Owner DATANG ENVIRONMENT IND GRP
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