Flash steam recycling system

Abstract

The utility model provides a flash steam recycling system, and belongs to the field of flash steam recycling. The system comprises a heat exchanger, a boiler water supply tank, a first flash tank, a second flash tank, a condensate water collecting tank, a heat conduction pipe, a first water pump, a second water pump, a temperature sensor, a liquid level sensor, a steam compressor and a controller. The two flash tanks are arranged to carry out two-time step-by-step flash evaporation to fully recycle and utilize flash steam heat, and the boiler feed water temperature is continuously increased twice through the heat exchanger and the heat conduction pipe, so that the combustion energy consumption is reduced; through recovery of flash steam heat, visual pollution caused by white fog generated by flash steam emission is reduced or avoided, energy emission is reduced, and energy is saved; and steam discharged by the second flash tank is secondarily heated and pressurized through the steam compressor, so that the boiler feed water temperature is further increased.

Description

Technical Field

[0001] The utility model belongs to the field of flash steam recovery, and in particular relates to a flash steam recovery and utilization system. Background Art

[0002] At present, high-pressure steam is widely used as a heating source in the fields of biopharmaceuticals, metallurgy and chemical industry. High-pressure steam is generally prepared by steam boilers. The use of high-pressure steam is mainly to utilize the latent heat emitted when it changes into high-pressure condensed water. When high-pressure condensed water is directly discharged into a normal pressure tank, a large amount of flash steam is usually discharged. The large amount of heat energy contained in these flash steam is not effectively utilized, resulting in energy waste. Summary of the invention

[0003] In view of the above technical problems, the utility model provides a flash steam recovery and utilization system, which fully collects the heat in the flash steam and uses it for boiler feed water heating to increase the boiler feed water temperature. It can not only effectively utilize the flash steam heat and reduce energy waste, but also increase the boiler feed water and reduce fuel consumption, thereby achieving the purpose of energy saving and consumption reduction.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is a flash steam recovery and utilization system, including a heat exchanger, a boiler feed water tank, a first flash tank, a second flash tank, a condensed water collection tank, and a heat pipe. The cold side inlet of the heat exchanger is connected to the water outlet of the boiler feed water tank, the cold side outlet of the heat exchanger is connected to the water inlet of the steam boiler, the hot side inlet of the heat exchanger is connected to the steam outlet at the top of the first flash tank, the hot side outlet of the heat exchanger is connected to the water inlet at the top of the condensed water collection tank, the side water inlet of the first flash tank is connected to the high-pressure condensed water collection pipe, the bottom water outlet of the first flash tank is connected to the side water inlet of the second flash tank, the top steam outlet of the second flash tank is connected to the heat pipe inlet arranged in the boiler feed water tank, the heat pipe outlet is connected to the water inlet at the top of the condensed water collection tank, and the bottom water outlet of the second flash tank is connected to the water inlet at the top of the condensed water collection tank.

[0005] Furthermore, a pressure transmitter and an electromagnetic flowmeter are provided on the pipeline between the heat exchanger and the steam boiler, and the pressure transmitter and the electromagnetic flowmeter are respectively connected to the controller signal of the independent peripheral.

[0006] Furthermore, a first water pump is provided on the pipeline between the boiler feed water tank and the heat exchanger, and the first water pump is connected to the controller signal.

[0007] Furthermore, a water supply pipe is provided between the condensate collection tank and the boiler feed water tank, a second water pump is provided on the water supply pipe, and the second water pump is connected to the controller signal.

[0008] Furthermore, a temperature sensor and a liquid level sensor are provided in the boiler feed water tank, and the temperature sensor and the liquid level sensor are respectively connected to the controller signal.

[0009] Furthermore, a steam compressor is provided on the pipeline between the second flash tank and the heat conducting pipe, and the steam compressor is connected to the controller signal.

[0010] Furthermore, the heat conducting pipe is a serpentine pipe or a spiral coil structure.

[0011] Due to the adoption of the above technical solution, the beneficial technical effects of the utility model are:

[0012] 1. The utility model provides two flash tanks to perform two step-by-step flash evaporations to fully recover and utilize the heat of flash steam, and increases the boiler feed water temperature twice through a heat exchanger and a heat pipe, thereby reducing combustion energy consumption.

[0013] 2. The utility model reduces or avoids the visual pollution caused by "white mist" generated by flash steam emission by recovering the heat of flash steam, thereby reducing energy emission and saving energy.

[0014] 3. The utility model uses a steam compressor to perform secondary heating and pressurization on the steam discharged from the second flash tank, thereby further increasing the boiler feed water temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a principle block diagram of the flash steam recovery and utilization system of the utility model;

[0016] Figure numerals: 1-boiler feed water tank, 2-first flash tank, 3-second flash tank, 4-condensate collection tank, 5-first heat exchanger, 6-first water pump, 7-second water pump, 8-controller, 9-pressure transmitter, 10-electromagnetic flowmeter, 11-temperature sensor, 12-liquid level sensor, 13-steam compressor. DETAILED DESCRIPTION

[0017] In order to more clearly illustrate the technical scheme and technical effects of the utility model, the utility model will be clearly and completely described below through embodiments in conjunction with the drawings of the specification. It should be understood that the embodiments described here are only used to explain a part of the embodiments of the utility model, rather than all the embodiments, and the technical features involved in the various embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0018] It should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0019] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense. For example, it can be fixedly connected, set, or detachably connected, set, or integrally connected, set; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances. Finally, it should be noted that the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0020] like Figure 1 As shown, a flash steam recovery and utilization system provided in this embodiment includes a heat exchanger, a boiler feed water box 1, a first flash tank 2, a second flash tank 3, a condensed water collecting tank 4, and a heat pipe. The cold side inlet of the heat exchanger is connected to the water outlet of the boiler feed water box 1, the cold side outlet of the heat exchanger is connected to the water inlet of the steam boiler, the hot side inlet of the heat exchanger is connected to the top steam outlet of the first flash tank 2, the hot side outlet of the heat exchanger is connected to the top water inlet of the condensed water collecting tank 4, the side water inlet of the first flash tank 2 is connected to the high-pressure condensed water collecting pipe, the bottom water outlet of the first flash tank 2 is connected to the side water inlet of the second flash tank 3, the top steam outlet of the second flash tank 3 is connected to the heat pipe inlet arranged in the boiler feed water box 1, the heat pipe outlet is connected to the top water inlet of the condensed water collecting tank 4, and the bottom water outlet of the second flash tank 3 is connected to the top water inlet of the condensed water collecting tank 4.

[0021] The high-pressure condensed water enters the first flash tank 2 through the high-pressure condensed water collecting pipe for reduced-pressure flash evaporation, and the separated steam enters the heat exchanger through the top of the first flash tank 2, and enters the condensed water collecting tank 4 after heat exchange; the pressurized condensed water discharged from the first flash tank 2 enters the second flash tank 3 for reduced-pressure flash evaporation again, and the separated steam enters the heat transfer pipe through the top of the second flash tank 3 to heat the water in the boiler feed water tank 1, and then enters the condensed water collecting tank 4.

[0022] In order to facilitate real-time detection of the pressure and flow of water entering the steam boiler, a pressure transmitter 9 and an electromagnetic flowmeter 10 are arranged on the pipeline between the heat exchanger and the steam boiler. The pressure transmitter 9 and the electromagnetic flowmeter 10 are respectively connected to the independent peripheral controller 8 for signal.

[0023] In this embodiment, the heat conduction pipe is a serpentine pipe or a spiral coil structure, the heat conduction pipe is made of aluminum or copper, the controller 8 adopts Siemens S7 series PLC, the pressure transmitter 9 adopts 3151 series intelligent pressure transmitter, and the electromagnetic flowmeter 10 adopts LDG type intelligent electromagnetic flowmeter DN100.

[0024] In order to facilitate the delivery of water in the boiler feed water tank 1 to the steam boiler, a first water pump 6 is provided on the pipeline between the boiler feed water tank 1 and the heat exchanger, and the first water pump 6 is connected to the controller 8 by signal.

[0025] In order to facilitate the replenishment of water in the condensate collection tank 4 into the boiler feed water tank 1, a water replenishment pipe is provided between the condensate collection tank 4 and the boiler feed water tank 1, and a second water pump 7 is provided on the water replenishment pipe. The second water pump 7 is connected to the controller 8 by signal.

[0026] In order to facilitate real-time monitoring of the temperature and liquid level of water in the boiler feed water tank 1, a temperature sensor 11 and a liquid level sensor 12 are provided in the boiler feed water tank 1. The temperature sensor 11 and the liquid level sensor 12 are respectively connected to the controller 8 by signal. Among them, the temperature sensor 11 adopts a T7413A immersion temperature sensor, and the liquid level sensor 12 adopts a LDW immersion liquid level sensor.

[0027] In order to further increase the temperature of the water in the boiler feed water tank 1, a steam compressor 13 is provided on the pipeline between the second flash tank 3 and the heat transfer pipe, and the steam compressor 13 is connected to the controller 8 by signal; the pressurized steam flowing out of the second flash tank 3 is further pressurized and heated by the steam compressor 13 to increase the temperature of the water in the boiler feed water tank 1.

[0028] The above description is a preferred embodiment of the present invention, which is used to explain the technical solution of the present invention and is not used to limit the present invention. Those skilled in the art can also make routine modifications, equivalent substitutions and improvements within the spirit and principles of the present invention, which are still included in the protection scope of the present invention.

Claims

1. A flash steam recovery system, characterized in that: It includes a heat exchanger, a boiler feed water tank, a first flash tank, a second flash tank, a condensed water collecting tank, and a heat pipe. The cold side inlet of the heat exchanger is connected to the water outlet of the boiler feed water tank, the cold side outlet of the heat exchanger is connected to the water inlet of the steam boiler, the hot side inlet of the heat exchanger is connected to the steam outlet at the top of the first flash tank, the hot side outlet of the heat exchanger is connected to the water inlet at the top of the condensed water collecting tank, the side water inlet of the first flash tank is connected to the high-pressure condensed water collecting pipe, the bottom water outlet of the first flash tank is connected to the side water inlet of the second flash tank, the top steam outlet of the second flash tank is connected to the heat pipe inlet arranged in the boiler feed water tank, the heat pipe outlet is connected to the water inlet at the top of the condensed water collecting tank, and the bottom water outlet of the second flash tank is connected to the water inlet at the top of the condensed water collecting tank.

2. The flash steam recovery and utilization system according to claim 1, characterized in that: A pressure transmitter and an electromagnetic flowmeter are provided on the pipeline between the heat exchanger and the steam boiler, and the pressure transmitter and the electromagnetic flowmeter are respectively connected to the controller signal of an independent peripheral.

3. The flash steam recovery and utilization system according to claim 2, characterized in that: A first water pump is provided on the pipeline between the boiler feed water tank and the heat exchanger, and the first water pump is connected to the controller signal.

4. The flash steam recovery and utilization system according to claim 2, characterized in that: A water supply pipe is provided between the condensate collection tank and the boiler feed water tank, a second water pump is provided on the water supply pipe, and the second water pump is connected to the controller signal.

5. The flash steam recovery and utilization system according to claim 2, characterized in that: The boiler feed water tank is provided with a temperature sensor and a liquid level sensor, and the temperature sensor and the liquid level sensor are respectively connected with controller signals.

6. The flash steam recovery and utilization system according to claim 2, characterized in that: A steam compressor is provided on the pipeline between the second flash tank and the heat conducting pipe, and the steam compressor is connected to the controller signal.

7. The flash steam recovery and utilization system according to claim 1, characterized in that: The heat conducting pipe is a serpentine pipe or a spiral coil structure.

Images