CN209415432U - Condensed water recovery system for power equipment - Google Patents

Abstract

The utility model discloses a kind of power-equipment condensation water recovery systems, including the condensing hot air furnace pipeline being connect with jet chimney, flash tank, vapour compression machine and heat exchanger, the condensation water inlet of flash tank is connect with the condensing hot air furnace pipeline, the high-temperature steam import of the steam (vapor) outlet and heat exchanger of flash tank conveys conveyance conduit connection by steam, and the water vapour compressor is set on steam conveying conveyance conduit, the condensation-water drain of flash tank and the condensation water inlet of heat exchanger are connected by condensed water conveyance conduit, the high-temperature condensation water of heat exchanger exports external supply equipment, the reduced temperature steam outlet of heat exchanger connects reflux line, reflux line stretches to flash tank internal upper part, and reflux line is equipped with spray equipment at the tube body being located in flash tank.The utility model improves the recovery efficiency of condensed water, ensure that the efficient utilization of condensed water.

Description

Condensed water recovery system for power equipment

technical field

The utility model relates to the field of steam pipe condensed water recovery equipment, in particular to a power equipment condensed water recovery system.

Background technique

Industrial boiler condensate recovery is one of the important ways to improve boiler thermal efficiency and reduce energy consumption. The thermal energy of steam is composed of two parts, sensible heat and latent heat. Usually, steam-using equipment only uses the latent heat and a small amount of sensible heat of steam. After releasing the latent heat and a small amount of sensible heat, the steam is reduced to high-temperature condensed water, and the condensed water is saturated with high temperature. Demineralized water, whose thermal energy value accounts for about 25% of steam thermal energy value, is also clean distilled water, suitable for re-use as boiler feed water.

The condensed water recovery system recovers the high-temperature condensed water discharged from the steam system, which can maximize the use of the heat of condensed water, save water and fuel. The condensate recovery system can be roughly divided into two types: open recovery system and closed recovery system. The closed recovery system is that the condensate collection tank and all pipelines are under constant positive pressure, and the system is closed. Most of the energy of the condensed water in the system is directly recovered to the boiler through certain recovery equipment. At present, there are problems in the condensate recovery system of industrial boilers, such as large flash loss, high pressure of the recovery system, and poor flow of condensate in steam pipelines, resulting in low recovery and utilization rate of condensate in steam pipelines and serious waste of heat energy.

Utility model content

In order to solve the deficiencies in the prior art, the utility model provides a condensed water recovery system for power equipment, which improves the condensed water recovery efficiency and ensures efficient utilization of the condensed water.

In order to solve the above technical problems, the utility model adopts the following technical scheme: a condensed water recovery system for power equipment, which includes a condensed water recovery pipeline connected to a steam pipeline, and also includes a flash tank, a steam compressor and a heat exchanger. The tank is provided with condensate inlet, steam outlet and condensate outlet, and the heat exchanger is provided with condensate inlet, high temperature condensate outlet, high temperature steam inlet and low temperature steam outlet;

The condensed water inlet of the flash tank is connected to the condensed water recovery pipeline, the steam outlet of the flash tank is connected to the high-temperature steam inlet of the heat exchanger through a steam delivery pipeline, and the steam delivery pipeline is provided with the steam compression machine, the condensed water outlet of the flash tank is connected to the condensed water inlet of the heat exchanger through the condensed water delivery pipe, the high-temperature condensed water outlet of the heat exchanger is connected to the external water supply equipment, and the low-temperature steam outlet of the heat exchanger is connected to the return pipe, and the return pipe extends into the upper part of the flash tank, and the return pipe is provided with a spray device at the pipe body in the flash tank.

The condensed water inlet and steam outlet are arranged at the top of the flash tank, and the condensed water outlet is arranged at the bottom of the flash tank.

The return pipeline extends into the flash tank through the upper part of the side wall of the flash tank.

The return pipe is provided with spray holes on the pipe body in the flash tank to form the spray device.

A water pump is arranged on the condensed water delivery pipeline.

The water supply equipment is a boiler water supply pipeline.

The top of the flash tank is provided with a pressure sensor for detecting the internal pressure of the flash tank;

The operating frequency of the steam compressor is controlled by the pressure sensor. When the pressure sensor detects that the internal pressure of the flash tank is higher than the set value, the steam compressor operates at high frequency. When the pressure sensor detects that the internal pressure of the flash tank is low At the set value, the steam compressor runs at low frequency.

The water vapor compressor is a variable frequency twin-screw compressor.

The return pipeline is provided with an electric throttle valve, and the electric throttle valve is connected with the pressure sensor for control.

The heat exchanger is a plate heat exchanger.

The beneficial effects of the utility model:

With the above technical solution, after the condensed water from the steam pipeline reaches the flash tank through the condensed water recovery pipeline, because the volume is much larger than that of the pipeline, the pressure suddenly decreases, the condensed water is partially vaporized, and the condensed water is divided into two parts: liquid and gas. At this time, the gaseous water vapor is continuously transported from the inlet of the water vapor compressor to the outlet of the water vapor compressor under the action of the water vapor compressor, so that the internal pressure drops. At this time, the pressure difference between the inside of the steam pipe and the steam pipe Increased, the condensed water in the steam pipeline quickly enters the flash tank under the action of the pressure difference, and the condensed water recovery efficiency is improved.

The temperature and pressure of the water vapor at the outlet of the water vapor compressor are higher than those at the inlet of the compressor. This part of the high-temperature and high-pressure steam enters the heat exchanger and undergoes a heat transfer process with the condensed water from the water pump, further improving The pressure and temperature of the condensed water in the heat exchanger are guaranteed, and the condensed water at the high-temperature condensed water outlet of the heat exchanger is directly connected to the water supply pipe of the boiler to ensure that the recovered condensed water is used for boiler water supply.

The steam from the water vapor compressor, after being condensed by the heat exchanger, is throttled by the electric throttle valve to reduce the temperature and pressure, and becomes low-temperature liquid water, which enters the flash tank and forms mist through the spray hole on the return pipe. melted and dispersed inside the flash tank. At this time, after the condensed water entering the flash tank undergoes flash evaporation, a heat and mass transfer process occurs between the water vapor generated and the low-temperature liquid water, and the flash steam is condensed into a liquid state, which drops to the bottom of the flash tank, further Reduce the pressure in the flash tank, which is beneficial to the recovery of condensed water in the steam pipeline.

Description of drawings

Fig. 1 is the schematic diagram of the utility model embodiment;

Fig. 2 is the schematic diagram of flash tank in the utility model embodiment;

Fig. 3 is the schematic diagram of heat exchanger in the utility model embodiment;

Fig. 4 is a schematic diagram of a serpentine pipeline in an embodiment of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in detail.

As shown in Figures 1 to 4, a power equipment condensate recovery system of the present invention includes a condensate recovery pipeline 8 connected to a steam pipeline, and also includes a flash tank 2, a steam compressor 3 and a heat exchanger 5 , the top of the flash tank 2 is provided with a condensed water inlet 21 and a steam outlet 23, the bottom of the flash tank 2 is provided with a condensed water outlet 24, and the heat exchanger 5 is provided with a condensed water inlet 53, a high-temperature condensed water outlet 54, a high-temperature steam Inlet 51 and low temperature steam outlet 52.

The condensed water inlet 21 of the flash tank 2 is connected to the condensed water recovery pipeline 8, the steam outlet 23 of the flash tank 2 is connected to the high-temperature steam inlet 51 of the heat exchanger 5 through a steam delivery pipeline, and the steam delivery pipeline The water vapor compressor 3 is arranged on it, and the condensed water outlet 24 of the flash tank 2 is connected to the condensed water inlet 53 of the heat exchanger 5 through a condensed water delivery pipeline, and a water pump 4 is arranged on the condensed water delivery pipeline. The high-temperature condensed water outlet 54 of the heat exchanger 5 is externally connected to the boiler water supply pipe, and the low-temperature steam outlet 52 of the heat exchanger 5 is connected to the return pipe 22. The return pipe 22 extends into the upper part of the flash tank 2, and the return pipe 22 is located in the flash tank The pipe body in the tank 2 is provided with a spraying device. The return pipeline 22 is also provided with an electric throttle valve

In this embodiment, the return pipeline 22 extends into the flash tank 2 through the upper part of the side wall of the flash tank 2, and the return pipeline 22 is arranged in a serpentine shape in the pipe body located in the flash tank 2 to form a serpentine pipeline, and the bottom of the pipe body of the serpentine pipeline is provided with spray holes to form the spray device.

In this embodiment, in order to ensure the heat exchange effect, the heat exchanger 5 adopts a plate heat exchanger.

The utility model solves the problem that the condensed water in the steam pipeline cannot be recovered smoothly due to the high pressure of the flash tank during the recovery process of the condensed water in the steam pipeline. The utility model reduces the internal pressure of the flash tank by using a steam compressor to ensure the smooth flow of condensed water in the steam pipeline. At the same time, the high-temperature steam discharged from the steam compressor exchanges heat with the condensed water pressurized by the water pump and raises its temperature. The high-temperature hot water from the outlet of the heat exchanger enters the boiler water supply pipe. The steam cooled by the heat exchanger enters the flash tank after being throttled and cooled by the electric throttle valve, and exchanges heat with the steam in the flash tank to further reduce the pressure of the flash tank and ensure the smooth flow of condensed water in the steam pipeline into the flash tank Tank, while increasing the temperature of the condensed water entering the boiler water supply pipe, the condensed water recovery system ensures the efficient use of condensed water.

The specific working principle of the utility model is as follows: the condensed water from the steam pipeline (steam using equipment) reaches the flash tank 2 through the condensed water recovery pipeline 8, because the volume is much larger than the pipeline volume, the pressure suddenly decreases, and the condensed water is partially vaporized , the condensed water is divided into liquid and gaseous two parts. At this time, the gaseous water vapor is continuously transported from the inlet of the water vapor compressor to the outlet of the water vapor compressor under the action of the water vapor compressor 3, so that the internal pressure drops. The pressure difference between the pipelines increases, and the condensed water in the steam pipeline (steam-consuming equipment) quickly enters the flash tank 2 under the action of the pressure difference, and the condensed water recovery efficiency is improved.

The water vapor at the outlet of the water vapor compressor 3 has a higher temperature and pressure than the steam at the inlet of the compressor. This part of the high-temperature and high-pressure steam enters the heat exchanger 5 and undergoes a heat transfer process with the condensed water from the water pump 4. The pressure and temperature of the condensed water in the heat exchanger are further increased, and the condensed water at the high-temperature condensed water outlet of the heat exchanger is directly connected to the water supply pipe of the boiler, ensuring that the recovered condensed water is used for boiler water supply.

The steam from the water vapor compressor 2, after being condensed by the heat exchanger, is throttled and lowered by the electric throttle valve 6 to reduce the temperature and pressure, and becomes low-temperature liquid water and enters the serpentine pipeline in the flash tank 2 (return pipeline 22 In the pipe body located in the flash tank (which is arranged in a serpentine shape), atomization is formed through the spray holes of the serpentine pipes and dispersed in the flash tank 2 . At this time, after the condensed water entering the flash tank 2 undergoes flash evaporation, a heat and mass transfer process occurs between the generated water vapor and the low-temperature liquid water, and the flash steam is condensed into a liquid state and drips at the bottom of the flash tank 2 , to further reduce the pressure in the flash tank 2, which is beneficial to the recovery of condensed water in the steam pipeline.

In this embodiment, the top of the flash tank 2 is provided with a pressure sensor 1 for detecting the internal pressure of the flash tank; the water vapor compressor 3 is a variable frequency twin-screw compressor, and the operating frequency of the water vapor compressor 3 is controlled by the pressure sensor 1 control, when the pressure sensor 1 detects that the internal pressure of the flash tank is higher than the set value, the water vapor compressor 3 runs at high frequency, and when the pressure sensor 1 detects that the internal pressure of the flash tank is lower than the set value, the water vapor compressor 3 The steam compressor 3 operates at a low frequency (the set value can be adjusted by the user according to the needs), which realizes the automatic control and operation of the water vapor compressor 3 .

The electric throttle valve 6 is in control connection with the pressure sensor 1 . The electric throttle valve opens 6 degrees and is controlled by the internal pressure of the water storage tank, so that the liquid water temperature behind the throttle valve is lower than the flash steam temperature in the water storage tank by 3°C, ensuring that the flash steam entering the flash tank from the steam pipeline can be condensed in time is liquid.

The above embodiments are only used to illustrate and not limit the technical solutions of the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that the present utility model can still be modified or equivalently replaced. Any modification or partial replacement without departing from the spirit and scope of the present utility model shall fall within the scope of the claims of the present utility model.

In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "front", "rear", "upper", "lower", "left", "right" etc. The orientation or positional relationship is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be interpreted as a reference to the utility model. Limitations on New Types of Protected Content.

Claims (10)

1. A condensed water recovery system for power equipment, comprising a condensed water recovery pipeline connected to a steam pipeline, characterized in that it also includes a flash tank, a steam compressor and a heat exchanger, and the flash tank is provided with a condensed water inlet , steam outlet and condensed water outlet, the heat exchanger is equipped with condensed water inlet, high temperature condensed water outlet, high temperature steam inlet and low temperature steam outlet; The condensed water inlet of the flash tank is connected to the condensed water recovery pipeline, the steam outlet of the flash tank is connected to the high-temperature steam inlet of the heat exchanger through a steam delivery pipeline, and the steam delivery pipeline is provided with the steam compression machine, the condensed water outlet of the flash tank is connected to the condensed water inlet of the heat exchanger through the condensed water delivery pipe, the high-temperature condensed water outlet of the heat exchanger is connected to the external water supply equipment, and the low-temperature steam outlet of the heat exchanger is connected to the return pipe, and the return pipe extends into the upper part of the flash tank, and the return pipe is provided with a spray device at the pipe body in the flash tank. 2. The condensed water recovery system for power equipment according to claim 1, characterized in that: the condensed water inlet and the steam outlet are arranged at the top of the flash tank, and the condensed water outlet is arranged at the bottom of the flash tank. 3. The power equipment condensate recovery system according to claim 1, characterized in that: the return pipe extends into the flash tank through the upper part of the side wall of the flash tank. 4. The power equipment condensed water recovery system according to claim 3, characterized in that: the return pipe is provided with spray holes on the pipe body located in the flash tank to form the spray device. 5. The power equipment condensate recovery system according to claim 1, characterized in that: the condensate delivery pipeline is provided with a water pump. 6. The condensed water recovery system for power equipment according to claim 1, wherein the water supply equipment is a boiler water supply pipeline. 7. The power equipment condensate recovery system according to any one of claims 1-6, characterized in that: the top of the flash tank is provided with a pressure sensor for detecting the internal pressure of the flash tank; The operating frequency of the steam compressor is controlled by the pressure sensor. When the pressure sensor detects that the internal pressure of the flash tank is higher than the set value, the steam compressor operates at high frequency. When the pressure sensor detects that the internal pressure of the flash tank is low At the set value, the steam compressor runs at low frequency. 8. The condensed water recovery system for power equipment according to claim 7, wherein the water vapor compressor is a variable frequency twin-screw compressor. 9. The power equipment condensed water recovery system according to claim 7, characterized in that: the return pipeline is provided with an electric throttle valve, and the electric throttle valve is connected to the pressure sensor for control. 10. The condensed water recovery system for power equipment according to claim 7, wherein the heat exchanger is a plate heat exchanger.