A flue gas dehumidification and water recovery method using indirect evaporative cooling for cooling
An evaporative cooling and evaporative cooling technology, which is applied to the dehumidification of boiler flue gas, can solve the problems of pump power consumption and other problems, and achieve the effects of saving water resources, wide application types, and wide application areas
Active Publication Date: 2019-09-20
TIANJIN UNIV
View PDF7 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The solution pump in the liquid solution dehumidification still needs to consume part of the pump power, and the heat pump dehumidification requires external input of additional electric energy
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0027] The high-temperature undesulfurized flue gas with a temperature of 130°C first exchanges heat with the heating hot water in the flue gas-water heat exchanger 2, the supply water temperature of the heating hot water is 85°C, the return water temperature is 60°C, and the flue gas is cooled to become 80°C undesulfurized flue gas. After that, it enters the reheat heat exchanger 3, exchanges heat with the wet flue gas that has been deeply dehumidified, and further cools down to 55°C non-desulfurized flue gas. After the flue gas is desulfurized by the desulfurization tower 4, a saturated desulfurized wet flue gas at 45°C is formed. The wet flue gas and the outdoor cold air exchange heat in the air-flue gas sensible heat exchange system, the flue gas cools down, and condensed water is precipitated. In the condensate collection tank of the heat exchange system. The pre-dehumidified wet flue gas enters the dry channel of the indirect evaporative cooler through the flue gas cha...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for flue gas dehumidification and water recovery by utilization of indirect evaporative cooling. The method comprises the following steps: after being discharged froma boiler, flue gas passes through a flue gas and hot water heat exchanger, a reheating heat exchanger, and a wet desulfurizing tower for cooling and desulfurizing treatment; the cooled and desulfurized flue gas exchanges heat with outdoor cold air in an air and flue gas sensible heat exchange system for preliminarily dehumidifying; the preliminarily dehumidified flue gas enters an indirect evaporative cooling system for deep dehumidifying; and then, the deeply dehumidified flue gas is reheated and reheated flue gas is discharged. According to the method disclosed by the invention, the outdoorcold air can be utilized in winter; through the air and flue gas sensible heat exchange system and the indirect evaporative cooling system, the flue gas can be subjected to deep cooling and dehumidifying treatment, thereby solving the environmental problems of smog, local acid rain, acid ice and the like caused by the too high moisture content of flue gas; meanwhile, a natural cold source can be utilized for cooling, dehumidifying, and white smog eliminating, thereby achieving energy conservation and deep humidifying, and lowering the flue gas discharging temperature; the technological processapplication range is wide, and the method is applicable to areas of which the latitudes are lower than 40 degrees; and the systems are simple and cheap, the initial investment is low, and the annualoperating cost is low.
Description
technical field [0001] The invention relates to the field of air pollution control. In particular, it involves the dehumidification of boiler flue gas, the elimination of water vapor, and the control of smog. Background technique [0002] my country's boilers are mainly coal-fired. In 2014, my country's coal-fired power generation was 3.951 billion kwh, accounting for about 93.5% of thermal power generation and 70.5% of the country's total power generation. Coal-fired power generation requires desulfurization. At present, most coal-fired boilers use wet desulfurization method for desulfurization. The moisture content of the flue gas after wet desulfurization is 80-100g / kg, the temperature is 45-60 degrees Celsius, and the flue gas is in a saturated state. In winter, when the saturated flue gas is discharged from the chimney, it mixes with the cold outdoor air. Under the dual effects of low outdoor air temperature and high moisture content of the flue gas, the gas mixing p...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): F23J15/02F23J15/06F24D15/02
CPCF23J15/02F23J15/06F24D15/02Y02E20/30
Inventor 刘俊杰陈冰倩陈传铭贾利芝
Owner TIANJIN UNIV