CN217763601U - A system of desulfurization slurry flash evaporation and solar energy complementary heating - Google Patents

Abstract

The utility model provides a system for heating by complementary flash evaporation and solar energy of desulfurized slurry, including desulfurization unit, absorption heat pump and solar collector, wherein, the flash evaporation steam outlet that sets up on the desulfurization unit connects the low temperature heat source entry that sets up on the absorption heat pump; a working medium outlet arranged on the solar heat collector is connected with a high-temperature heat source inlet arranged on the absorption heat pump; a water inlet arranged on the absorption heat pump is connected with a heat supply network water return pipeline; a water outlet arranged on the absorption heat pump is connected with a water supply pipeline of a heat supply network; the utility model discloses can improve unit generated energy and energy utilization efficiency.

Description

A system of desulfurization slurry flash evaporation and solar energy complementary heating

technical field

The utility model belongs to the field of coal power, and in particular relates to a system for complementary heating of desulfurization slurry flash evaporation and solar energy.

Background technique

Flue gas emissions from coal-fired power plants are one of the main sources of air pollutants in China, and wet desulfurization towers are widely used in domestic coal-fired power plants. The temperature of the flue gas treated by the wet desulfurization device is 45-55°C, and the flue gas contains a large amount of water vapor, which is in a saturated state and carries a large amount of latent heat of vaporization.

Desulfurization slurry flash heat extraction technology is a new flue gas waste heat recovery technology. This technology utilizes the characteristic that the boiling point of the slurry in the wet flue gas desulfurization process will decrease with the decrease of the ambient pressure, and establishes a vacuum phase change environment, so that the desulfurization slurry above the current negative pressure saturation temperature will flash and generate negative pressure steam. The latent heat of vaporization is transported to the absorption heat pump to condense and release heat to the low-temperature medium, so as to realize the clean, efficient and low-cost recovery of the waste heat of the desulfurization slurry. This technology can realize the multiple purposes of energy saving, water saving, improving desulfurization efficiency, and eliminating visual pollution of smoke plume, and it can take energy saving and emission reduction into consideration at the same time.

However, the current desulfurization slurry flash technology needs to introduce a steam turbine extraction steam as the high-temperature heat source of the absorption heat pump, which affects the power generation of the steam turbine.

Contents of the invention

The purpose of the utility model is to provide a desulfurization slurry flash evaporation and solar energy complementary heat supply system, which solves the above-mentioned shortcomings existing in the prior art.

In order to achieve the above object, the technical scheme that the utility model adopts is:

The utility model provides a system for complementary heating of desulfurization slurry flash evaporation and solar energy, which includes a desulfurization unit, an absorption heat pump and a solar collector, wherein the flash steam outlet set on the desulfurization unit is connected to the absorption heat pump The low-temperature heat source inlet is set; the working fluid outlet set on the solar collector is connected to the high-temperature heat source inlet set on the absorption heat pump; the water inlet set on the absorption heat pump is connected to the heat network return pipe; the absorption heat pump The water outlet provided on the heat pump is connected to the water supply pipeline of the heating network.

Preferably, the desulfurization unit includes a desulfurization tower and a flash tank, wherein the desulfurization tower is provided with a flue gas inlet and a slurry outlet, and the slurry outlet is connected to a slurry inlet provided on the flash tank, and the flash tank The flash steam outlet set on the upper part is connected to the low-temperature heat source inlet set on the absorption heat pump.

Preferably, the slurry outlet provided on the flash tank is connected to a desulfurization tower.

Preferably, a slurry pump is arranged between the slurry outlet on the desulfurization tower and the slurry inlet on the flash tank.

Preferably, the condensed water outlet provided on the absorption heat pump is connected with a condenser.

Preferably, the steam inlet provided on the condenser is connected to the steam exhaust port provided on the steam turbine.

Preferably, the condenser is provided with a condensed water outlet.

Compared with the prior art, the beneficial effects of the utility model are:

The utility model provides a desulfurization slurry flash evaporation and solar energy complementary heat supply system, which uses the desulfurization unit to recover the waste heat in the low-temperature flue gas and improves energy utilization efficiency; uses solar energy as the high-temperature heat source of the absorption heat pump to replace steam turbine extraction , and the waste heat output by the desulfurization unit jointly drive the absorption heat pump to heat the water in the heating network, improving the power generation and energy utilization efficiency of the unit.

Description of drawings

Fig. 1 is a schematic diagram of the system structure of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail.

The utility model provides a complementary heating system for desulfurization slurry flash evaporation and solar energy, which includes a desulfurization unit, an absorption heat pump 3 and a solar heat collector 7, wherein the flash steam outlet provided on the desulfurization unit is connected to the absorption heat pump The low-temperature heat source inlet provided on 3; the working medium outlet provided on the solar collector 7 is connected to the high-temperature heat source inlet provided on the absorption heat pump 3; the water inlet provided on the absorption heat pump 3 is connected to the heat network return pipe ; The water outlet provided on the absorption heat pump 3 is connected to the water supply pipeline of the heating network.

The desulfurization unit includes a desulfurization tower 5 and a flash tank 4, wherein the desulfurization tower 5 is provided with a flue gas inlet and a slurry outlet, and the slurry outlet is connected to the slurry inlet provided on the flash tank 4, and the flash tank The flash steam outlet provided on the tank 4 is connected to the low-temperature heat source inlet provided on the absorption heat pump 3 .

The utility model provides a method for complementary heating of desulfurization slurry flash evaporation and solar energy, comprising the following steps:

The flue gas is desulfurized and flashed in the desulfurization unit, and the generated flash steam enters the absorption heat pump 3 as a low-temperature heat source;

The heat transfer working medium heated by solar energy in the solar heat collector 7 enters the absorption heat pump 3 as a high-temperature heat source;

The absorption heat pump 3 is jointly driven by the low-temperature heat source and the high-temperature heat source to heat the return water of the heat network and supply heat to the outside.

As shown in Figure 1, the utility model provides a desulfurization slurry flash evaporation and solar energy complementary heating system, including a steam turbine 1, a condenser 2, an absorption heat pump 3, a flash tank 4, a desulfurization tower 5, and a slurry pump 6 and solar thermal collector 7, wherein:

The flue gas inlet provided on the desulfurization tower 5 is connected to the outlet of the induced draft fan; the desulfurization slurry outlet of the desulfurization tower 5 is connected to the slurry inlet of the flash tank 4 through the slurry pump 6 .

The cold slurry outlet provided on the flash tank 4 is connected to the cold slurry inlet provided on the desulfurization tower 5 .

The steam outlet provided on the flash tank 4 is connected to the steam inlet provided on the absorption heat pump 3 ; the condensed water outlet provided on the absorption heat pump 3 is connected to the water supply port of the condenser 2 .

The water inlet provided on the absorption heat pump 3 is connected to the return water pipe of the heat network; the water outlet provided on the absorption heat pump 3 is connected to the water pipe of the heat network.

The heat transfer working medium outlet on the solar heat collector 7 is connected to the high temperature heat source inlet provided on the absorption heat pump 3 .

The heat transfer working medium outlet provided on the absorption heat pump 3 is connected to the heat transfer working medium inlet on the solar heat collector 7 .

The steam outlet provided on the steam turbine 1 is connected to the steam inlet provided on the condenser 2 .

The steam turbine 1 is provided with a superheated steam inlet.

The working process of the present utility model is:

The flue gas from the induced draft fan undergoes a desulfurization reaction with the desulfurization slurry sprayed from the top in the desulfurization tower 5, and the temperature is lowered and the humidity is increased at the same time.

The desulfurization slurry at the bottom outlet of the desulfurization tower 5 is sent to the flash tank 4 through the slurry pump 6, and the desulfurization slurry in the flash tank 4 undergoes an evaporative cooling process, flashes out steam, and at the same time cools down to become a cold slurry and sends it to the desulfurization tower 5. Spray into the tower.

After the superheated steam enters the steam turbine 1, it pushes the rotor of the steam turbine 1 to rotate and do work. The steam after work is discharged from the exhaust port of the steam turbine 1, enters the condenser, and is cooled by the cooling water in the condenser 2 to condense into water.

The heat transfer medium heated by solar energy in the solar collector 7 enters the absorption heat pump 3 as a high-temperature heat source, and the flash steam serves as a low-temperature heat source for the absorption heat pump 3, and the two jointly drive the absorption heat pump 3 to heat the water in the heat network to supply heat to the outside .

The beneficial effects of the utility model are:

1. Use the desulfurization slurry flash technology to recover the waste heat of the medium and low temperature flue gas, and improve the energy utilization efficiency.

2. Use solar energy as the high-temperature heat source of the absorption heat pump to replace the steam extraction of the steam turbine, and drive the absorption heat pump together with the flash steam to heat the water in the heating network, so as to improve the power generation and energy utilization efficiency of the unit.

Claims (7)

1. A system for desulfurization slurry flash evaporation and solar energy complementary heating, characterized in that it comprises a desulfurization unit, an absorption heat pump (3) and a solar heat collector (7), wherein the flash evaporation provided on the desulfurization unit The steam outlet is connected to the low-temperature heat source inlet provided on the absorption heat pump (3); the working fluid outlet provided on the solar collector (7) is connected to the high-temperature heat source inlet provided on the absorption heat pump (3); the absorption heat pump The water inlet provided on (3) is connected to the return water pipe of the heat network; the water outlet provided on the absorption heat pump (3) is connected to the water supply pipe of the heat network. 2. A system of desulfurization slurry flash evaporation and solar energy complementary heating system according to claim 1, characterized in that, the desulfurization unit comprises a desulfurization tower (5) and a flash tank (4), wherein the desulfurization The tower (5) is provided with a flue gas inlet and a slurry outlet, the slurry outlet is connected to the slurry inlet provided on the flash tank (4), and the flash steam outlet provided on the flash tank (4) is connected to an absorption heat pump (3) The low-temperature heat source inlet provided above. 3 . The system of desulfurization slurry flash evaporation and solar energy complementary heat supply according to claim 2 , characterized in that the slurry outlet provided on the flash tank ( 4 ) is connected to the desulfurization tower ( 5 ). 4. A system for desulfurization slurry flash evaporation and solar energy complementary heating according to claim 2, characterized in that the slurry outlet on the desulfurization tower (5) is connected to the slurry inlet on the flash tank (4) A slurry pump (6) is arranged between them. 5. The system of desulfurization slurry flash evaporation and solar energy complementary heat supply according to claim 1, characterized in that the condensed water outlet provided on the absorption heat pump (3) is connected to a condenser. 6. A system for desulfurization slurry flash evaporation and solar energy complementary heat supply according to claim 5, characterized in that the steam inlet provided on the condenser (2) is connected to the steam turbine (1) provided exhaust port. 7. The system of desulfurization slurry flash evaporation and solar energy complementary heat supply according to claim 5, characterized in that, the condenser (2) is provided with a condensed water outlet.

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