CN204730508U - A kind ofly apply the energy-conservation device of lithium bromide - Google Patents

Abstract

The utility model discloses an energy-saving device using lithium bromide, which is characterized in that it comprises a lithium bromide evaporator, an electric valve, a water pump, a heat exchanger and a heat pump; the air inlet of the lithium bromide evaporator is discharged through the electric valve and the steam turbine outlet The waste heat pipeline is connected, and the steam condensate outlet of the lithium bromide evaporator is connected to the inlet of the boiler through a water pump; the lithium bromide evaporator is connected with a throttle valve, an absorber and a pump for boosting pressure, so that the lithium bromide solution is recycled. The water outlet of the heat exchanger is connected to the water inlet of the heat pump. Compared with the prior art, the utility model uses the heat pump technology to recycle the heat in the cooling water of the lithium bromide evaporator to heat the boiler supply water, saves the cooling tower of the original refrigeration system, and makes the water in the form of steam lost by the power plant condensed, recovered, and regenerated Utilization has the advantages of energy saving and environmental protection.

Description

A device for energy saving using lithium bromide

technical field

The utility model belongs to the technical field of energy, in particular to an energy-saving device using lithium bromide.

Background technique

With the development of our country's economy and the progress of society, under the background of the national grand strategy of energy conservation and emission reduction, improving the utilization rate of energy is an urgent problem that the country needs to solve. The waste heat in traditional power plants is generally used for heating, so some power plants use waste heat for heating to form cogeneration systems, so thermal power plants are the most common form of using waste heat from power generation. However, under the conditions of energy conservation and emission reduction and continuous development of technology, how to fully and efficiently utilize the waste heat and high-temperature flue gas generated in the power generation process has become the focus of today's energy use.

Condensation heat in thermal power plants is discharged into the atmosphere through cooling towers or air-cooled islands, resulting in huge heat loss, which is the main reason for the low efficiency of energy use in thermal power plants. It not only causes waste of energy and water or electricity, but also seriously pollutes the atmosphere. The evacuation of condensation heat in thermal power plants is a common problem in our country and even in the world. It is a waste and helpless. However, with the development of heat pump technology, especially the advent of large-scale high-temperature water source heat pumps, it will become possible to save water and energy for generating sets and recover condensation heat.

Utility model content

The utility model provides an energy-saving device using lithium bromide. Lithium bromide is composed of alkali metal lithium and halogen elements. Since the lithium bromide aqueous solution itself has a high boiling point and is extremely difficult to volatilize, it can be considered that the steam on the liquid surface of the saturated lithium bromide solution is pure water vapor; at a certain temperature, the lithium bromide aqueous solution The saturated partial pressure of water vapor on the liquid surface is lower than that of pure water; and the higher the concentration, the smaller the saturated partial pressure of water vapor on the liquid surface. Therefore, under the same temperature conditions, the greater the concentration of lithium bromide aqueous solution, the stronger its ability to absorb water. This is why lithium bromide is usually used as the absorbent and water as the refrigerant.

In order to achieve the above purpose, the utility model is realized through the following technical solutions:

An energy-saving device using lithium bromide is characterized in that it includes a lithium bromide evaporator, an electric valve, a water pump, a heat exchanger, and a heat pump; the air inlet of the lithium bromide evaporator is connected to the waste heat pipeline discharged from the outlet of the steam turbine through an electric valve, and the The steam condensate outlet of the lithium bromide evaporator is connected to the inlet of the boiler through a water pump; the lithium bromide evaporator is connected with a throttling valve and an absorber and a pump for boosting pressure, so that the lithium bromide solution is recycled, and the heat exchanger The water outlet is connected to the water inlet of the heat pump.

Further, the water outlet of the heat pump is connected to the inlet of the boiler through the pump.

Further, the heat exchange ends of the heat pump and the heat exchanger are respectively connected to the inlet and outlet of the cooling water in the lithium bromide evaporator.

Further, a solution heat exchanger is arranged between the throttle valve and the absorber.

Compared with the prior art, the utility model uses the heat pump technology to recycle the heat in the cooling water of the lithium bromide evaporator to heat the boiler supply water, saves the cooling tower of the original refrigeration system, and makes the water in the form of steam lost by the power plant condensed, recovered, and regenerated Utilization has the advantages of energy saving and environmental protection.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the utility model using lithium bromide energy-saving device.

In the figure, 1 steam turbine, 2 boiler, 3 generator, 4 lithium bromide evaporator, 5 electric valve, 6 water pump, 7 heat exchanger, 8 heat pump, 15 absorber, 16 pump, 17 throttle valve, 18 solution heat exchanger

Detailed ways

Below in conjunction with accompanying drawing 1, the utility model is described in further detail.

The steam at the outlet of the boiler 2 first passes through the steam turbine to drive the generator to generate electricity. Part of the steam at the outlet of the steam turbine 1 is distributed to heat users for heat supply; the other part drives the lithium bromide evaporator 4 .

The inlet of the steam turbine 1 is connected to the outlet of the boiler 2 through the steam pipe, and the outlet of the steam turbine 1 is divided into two routes through the steam pipe. The power supply terminal supplies power to the grid through the generator;

The dilute lithium bromide solution is heated and concentrated by waste heat in the lithium bromide evaporator 4, and the concentrated lithium bromide solution is sent to the absorber 15 after being depressurized by the throttle valve 17. In the absorber 15, the concentrated lithium bromide solution absorbs water vapor and becomes a dilute lithium bromide solution and releases heat. The dilute lithium bromide solution is boosted by the pump 16 and sent to the lithium bromide evaporator 4, and the solution is set between the throttle valve 17 and the absorber 15. heat exchanger 18.

The steam condensate outlet of the lithium bromide evaporator 4 is connected to the inlet of the boiler 2 through the water pump 6; The heat exchange ends of the heat pump 8 and the heat exchanger 7 are respectively connected with the inlet and outlet of the cooling water in the lithium bromide evaporator 4.

The steam at the outlet of the boiler 2 first passes through the steam turbine to drive the generator to generate electricity to realize power supply. Part of the steam at the outlet of the steam turbine 1 is distributed to the heat user to realize heat supply; the other part drives the lithium bromide evaporator 4 for refrigeration, and the cold energy is brought to the cold user through the refrigerant water to realize the cooling supply.

Regarding the waste heat recovery of the lithium bromide evaporator 4, after the cooling water takes out the heat discharged by the lithium bromide evaporator 4, all or part of the cooling water heats the feed water in the boiler 2 through the heat pump 8 and the heat exchanger 7, thereby increasing the feed water of the boiler 2 temperature, reducing the coal consumption of boiler 2.

The specific implementation above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall include Within the protection scope of the present utility model.

Claims (4)

1. apply the device that lithium bromide is energy-conservation, it is characterized in that, comprise lithium bromide evaporimeter, motor-driven valve, water pump, heat exchanger, heat pump; The air inlet of described lithium bromide evaporimeter exports the used heat pipeline of discharging through motor-driven valve and steam turbine and is connected, and the steam condensation water outlet of described lithium bromide evaporimeter is connected to the import of boiler through water pump; Described lithium bromide evaporimeter connects choke valve and absorber and the pump for boosting, thus is recycled by lithium-bromide solution, and the delivery port of described heat exchanger connects the water inlet of heat pump.

2. the device that application lithium bromide according to claim 1 is energy-conservation, is characterized in that: the delivery port of described heat pump is connected with the import of boiler through water pump.

3. the device that application lithium bromide according to claim 1 is energy-conservation, is characterized in that: the heat-exchange end of described heat pump and heat exchanger is connected with the import of cooling water in lithium bromide evaporimeter and outlet respectively.

4. the device that application lithium bromide according to claim 1 is energy-conservation, is characterized in that: arrange solution heat exchanger between described choke valve and absorber.