Open type compression absorption heat pump system for water heat recovery in high-temperature and high-humidity gas

Abstract

The invention provides an open type compression absorption heat pump system for water heat recovery in high-temperature and high-humidity gas. An outlet of a gas pipeline is connected with a contact heat exchanger, a gas pressure adjusting device is arranged on the gas pipeline, the contact heat exchanger is connected with an absorber, a gas outlet at the upper end of the absorber is connected with an expansion machine, and a first pressure control valve is arranged on a pipeline between the absorber and the expansion machine; a circulating water inlet is connected with a solution water heat exchanger, the solution water heat exchanger is connected with a condenser, the condenser is connected with the contact heat exchanger, the lower end of the contact heat exchanger is connected with a circulating water tank, the circulating water tank is connected with a user side heat output device, and the user side heat output device is connected with the solution water heat exchanger; the absorber is connected with a solution heat exchanger, the solution heat exchanger is connected with a regenerator, the regenerator is connected with the solution heat exchanger, the solution heat exchanger is connected with the solution water heat exchanger, and the solution water heat exchanger is connected with the absorber; the regenerator is connected with the condenser, and the condenser is connected with a vacuum pump; and the expansion machine conveys energy to the vacuum pump. According to the system, utilization of waste heat of high-temperature and high-humidity gas, recovery of water, capturing of pollutant components and reuse of gas expansion work can be further realized, and the system has extremely strong engineering practical significance.

Description

technical field [0001] The invention belongs to the technical fields of heat exchange, waste heat utilization and environmental protection, and relates to an open compression absorption heat pump system for recovering water heat from high-temperature and high-humidity gas. Background technique [0002] High-temperature and high-humidity gases widely exist in various industries, including high-temperature and high-humidity air, desulfurization flue gas, and high-humidity gas. Taking a 600MW coal-fired boiler as an example, the water vapor content in the discharged wet flue gas is about 230t / h, which will cause the loss of a large amount of water resources. At the same time, water vapor droplets form condensation cores when they are discharged, which will promote the formation of smog under certain meteorological conditions. On the other hand, the flue gas at 50°C is a kind of waste heat. Although its energy quality is low and its density is small, the total amount is relativ...

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Problems solved by technology

[0006] But this application still has the following problems: 1. After the pressurized flue gas is contacted for heat exchange, the flue gas is still in a saturated state, and more water is still released to the environment, resulting in waste of moisture and latent heat of vaporization; 2. After pressurized contact heat exchange, the circulating water temperature is still low, resulting in poor subsequent energy use; 3. Saturated water vapor directly enters the expander turbine, and the pressure release process The temperature of the medium water vapor decreases, resulting in droplets of condensation, and the water in the turbine will seriously reduce the power, and even cause the blades to break

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