Phase change flue gas deep cooler with adjustable condensation area

Abstract

A phase change flue gas deep cooler with adjustable condensation area includes a flue gas chamber, a support plate, several phase change heat pipes with a lower heat exchange section fixedly mounted on the support plate and an upper condensation section consisting of bare tubes, a cooling water tank installed above the flue gas chamber and connected to the bare tubes of the phase change heat pipes, a circulating cooling water distribution plate, each inlet connecting pipe corresponding to each cooling water zone on one side of the cooling water tank, an inlet manifold, an inlet main pipe, each outlet connecting pipe, an outlet manifold, an outlet main pipe, an inlet control valve, a gas storage tank, an exhaust control valve, and a level gauge installed on the upper side of the cooling water tank. This invention features an adjustable condensation area, controlling the outlet flue gas temperature and water temperature, ensuring uniform circulating cooling water flow, sufficient heat exchange, eliminating low-temperature corrosion, ensuring that circulating cooling water does not leak into the flue gas chamber, and extending service life. It can be widely used in the field of waste heat recovery from flue gas in power plant boilers and other industrial boilers.

Description

Technical Field

[0001] This invention relates to a phase change flue gas deep cooler with adjustable condensation area, which can be widely used in the field of waste heat recovery from flue gas in power plant boilers and other industrial boilers. Background Technology

[0002] Currently, thermal power units account for over 70% of the total installed power generation capacity, resulting in significant heat loss in energy consumption. Power plant boilers account for 70-80% of this energy loss. Existing deep flue gas coolers are typically located within the inlet flue of the dust collector. The flue gas at this location is untreated, leading to high dust concentrations. Dust particles erode the heating surfaces, causing wear and leakage in phase change heat pipes, particularly noticeable with high-ash coal. If not properly addressed, this can even cause blockages in the flue gas system, affecting the safe operation of the unit. Furthermore, traditional deep flue gas coolers cannot adapt in real-time to changes in flue gas temperature and volume caused by load fluctuations in power plant and industrial boilers. This results in excessively low wall temperatures in the deep flue gas coolers, leading to low-temperature corrosion and leakage, threatening the safe operation of subsequent boiler auxiliary equipment. Even worse, when one or more systems in a thermal power plant malfunction, causing the generator to trip suddenly—an abnormal generator shutdown—the losses can be enormous. Summary of the Invention

[0003] The purpose of this invention is to provide a phase change flue gas deep cooler with adjustable condensation area, which controls the outlet flue gas temperature, ensures uniform flow of circulating cooling water, provides sufficient heat exchange, eliminates low-temperature corrosion, ensures that circulating cooling water does not leak into the flue gas chamber, and extends service life.

[0004] To achieve the above objectives, the present invention provides a phase change flue gas deep cooler with adjustable condensation area, comprising a flue gas housing with a flue gas inlet and a flue gas outlet, a support plate installed in the middle of the flue gas housing cavity, several phase change heat pipes with a lower heat exchange section fixedly installed on the support plate and an upper condensation section consisting of bare tubes, a cooling water tank installed above the flue gas housing and connected to the bare tubes of the phase change heat pipes, and several circulating cooling water distribution plates installed inside the cooling water tank, dividing the cooling water tank into several cooling water zones, and correspondingly connected to each cooling water zone on one side of the cooling water tank. Each inlet water connecting branch pipe, an inlet water manifold connected to each inlet water connecting branch pipe, an inlet water main pipe connected to the inlet water manifold, each outlet water connecting branch pipe connected to each cooling water zone on the other side of the cooling water tank, an outlet water manifold connected to each outlet water connecting branch pipe, an outlet water main pipe connected to the outlet water manifold, an air intake control valve connected to one side of the cooling water tank via an air passage pipe, an air storage tank connected to the air intake control valve via an air passage pipe, an exhaust control valve connected to the other side of the cooling water tank via an air passage pipe, and a level gauge installed on the upper side of the cooling water tank.

[0005] The present invention relates to a phase change flue gas deep cooler with adjustable condensation area, wherein the lower heat exchange section of the phase change heat pipe is placed inside the flue gas box, and the upper condensation section is placed inside the cooling water tank.

[0006] The present invention relates to a phase change flue gas deep cooler with adjustable condensation area, wherein the lower heat exchange section of the phase change heat pipe is a toothed spiral finned tube.

[0007] The present invention relates to a phase change flue gas deep cooler with adjustable condensation area, wherein the lower heat exchange section of the phase change heat pipe is a needle-shaped tube.

[0008] The present invention relates to a phase change flue gas deep cooler with adjustable condensation area, wherein the gas storage tank is an inert gas container.

[0009] The present invention relates to a phase change flue gas deep cooler with adjustable condensation area, wherein the inert gas is nitrogen, argon, or helium.

[0010] The working principle of the phase change flue gas deep cooler with adjustable condensation area of ​​this invention is as follows: (1) An exhaust control valve and an intake control valve are installed on the cooling water tank. The intake control valve is connected to a gas storage tank for storing inert gas. When the power plant boiler load is high and the outlet flue gas temperature is high, the exhaust control valve is opened to reduce the volume of inert gas in the cooling water tank, increase the contact area between the circulating cooling water and the condensing section of the phase change heat pipe, increase the heat exchange area, and reduce the outlet flue gas temperature of the deep flue gas cooler. When the power plant boiler load is low and the outlet flue gas temperature is low, the intake control valve is opened to increase the volume of inert gas in the cooling water tank, reduce the contact area between the circulating cooling water and the condensing section of the phase change heat pipe, reduce the heat exchange area, increase the outlet flue gas temperature of the deep flue gas cooler, and avoid low-temperature corrosion.

[0011] (2) The inert gas in the gas storage tank enters the cooling water tank through the gas pipeline and the gas inlet control valve, thus filling the cooling water tank with inert gas. The volume of the cooling water tank is fixed. The more inert gas enters the cooling water tank, the less water is in the cooling water tank. By controlling the volume of inert gas, the liquid level can be adjusted. By adjusting the volume occupied by the inert gas in the cooling water tank, the water volume in the cooling water tank is controlled, that is, the water level in the cooling water tank is controlled, thereby adjusting the contact area between the upper condensing section of the phase change heat pipe and the circulating cooling water, that is, the condensing area is adjustable.

[0012] (3) The flue gas chamber and the cooling water tank operate independently. The flue gas medium in the flue gas chamber flows only within the flue gas chamber. The cooling water medium in the cooling water tank flows only within the cooling water tank and within the cavity of the phase change heat exchange tubes. The flue gas and cooling water operate independently, ensuring that the cooling water medium and the flue gas medium do not come into contact with each other, i.e., the flue gas and water are isolated, ensuring that the circulating cooling water will not leak into the flue gas chamber.

[0013] The present invention relates to a phase change flue gas deep cooler with adjustable condensation area. The circulating cooling water flow equalization plate divides the cooling water tank into several cooling water zones, ensuring uniform flow of circulating cooling water, avoiding flow deviation, and facilitating heat exchange for sufficient heat exchange.

[0014] The present invention relates to a phase change flue gas deep cooler with adjustable condensation area, wherein the level gauge can monitor the circulating cooling water level in real time.

[0015] This invention relates to a phase change flue gas deep cooler with adjustable condensation area. By controlling the contact area between the condensation section of the phase change heat pipe and the circulating cooling water, the condensation area can be adjusted, thereby controlling the outlet flue gas temperature. This adapts to changes in flue gas temperature and volume caused by load fluctuations in power plant boilers and other industrial boilers, eliminates low-temperature corrosion caused by excessively low equipment wall temperature under low-load conditions, and extends service life.

[0016] In summary, the phase change flue gas deep cooler of the present invention has an adjustable condensation area, which controls the outlet flue gas temperature, ensures uniform flow of circulating cooling water, provides sufficient heat exchange, eliminates low-temperature corrosion, ensures that circulating cooling water does not leak into the flue gas chamber, and extends service life. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 AA section view in the image. Detailed Implementation

[0019] exist Figure 1 , Figure 2The present invention discloses a phase change flue gas deep cooler with adjustable condensation area, comprising a flue gas box 1 with a flue gas inlet a and a flue gas outlet b, a support plate 2 installed in the middle of the cavity of the flue gas box, a plurality of phase change heat pipes 3 with a lower heat exchange section fixedly installed on the support plate and an upper condensation section being a bare tube c, a cooling water tank 4 installed above the flue gas box and connected to the bare tubes of the phase change heat pipes, a plurality of circulating cooling water distribution plates 5 installed inside the cooling water tank and dividing the cooling water tank into a plurality of cooling water zones d, and a water inlet connector connected to each cooling water zone on one side of the cooling water tank. Pipe 6, inlet manifold 7 connected to each inlet connecting branch pipe, main inlet pipe 8 connected to the inlet manifold, each outlet connecting branch pipe 9 connected to each cooling water zone on the other side of the cooling water tank, outlet manifold 10 connected to each outlet connecting branch pipe, main outlet pipe 11 connected to the outlet manifold, air intake control valve 12 connected to one side of the cooling water tank via an air pipeline, air storage tank 13 connected to the air intake control valve via an air pipeline, exhaust control valve 14 connected to the other side of the cooling water tank via an air pipeline, and level gauge 15 installed on the upper side of the cooling water tank.

[0020] The present invention relates to a phase change flue gas deep cooler with adjustable condensation area, wherein the lower heat exchange section of the phase change heat pipe is placed inside the flue gas box, and the upper condensation section is placed inside the cooling water tank.

[0021] The present invention relates to a phase change flue gas deep cooler with adjustable condensation area, wherein the lower heat exchange section of the phase change heat pipe is a toothed spiral finned tube.

[0022] The present invention relates to a phase change flue gas deep cooler with adjustable condensation area, wherein the lower heat exchange section of the phase change heat pipe is a needle-shaped tube.

[0023] The present invention relates to a phase change flue gas deep cooler with adjustable condensation area, wherein the gas storage tank is an inert gas container.

[0024] The present invention relates to a phase change flue gas deep cooler with adjustable condensation area, wherein the inert gas is nitrogen, argon, or helium.

[0025] In summary, the above description only describes preferred embodiments of the present invention. It should be noted that the present invention is not limited to the specific embodiments described above. The devices and structures not described in detail should be understood as being implemented in the ordinary way in the art. Any simple modifications, equivalent changes and alterations made by those skilled in the art to the above embodiments based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A phase change flue gas deep cooler with adjustable condensation area, characterized in that, The system includes a flue gas chamber with a flue gas inlet and outlet, a support plate installed in the middle of the flue gas chamber cavity, several phase change heat pipes with a lower heat exchange section fixedly installed on the support plate and an upper condensation section consisting of bare tubes, a cooling water tank installed above the flue gas chamber and connected to the bare tubes of the phase change heat pipes, several circulating cooling water distribution plates installed inside the cooling water tank and dividing the cooling water tank into several cooling water zones, and each water inlet connecting pipe connected to each cooling water zone on one side of the cooling water tank. The system includes: an inlet manifold connected to a branch pipe; an inlet main pipe connected to the inlet manifold; an outlet connecting branch pipe connected to each cooling water zone on the other side of the cooling water tank; an outlet manifold connected to each outlet connecting branch pipe; an outlet main pipe connected to the outlet manifold; an intake control valve connected to one side of the cooling water tank via an air pipeline; an air storage tank connected to the intake control valve via an air pipeline; an exhaust control valve connected to the other side of the cooling water tank via an air pipeline; and a level gauge installed on the upper side of the cooling water tank. An exhaust control valve and an intake control valve are installed on the cooling water tank. The intake control valve is connected to a gas storage tank for storing inert gas. When the power plant boiler load is high and the outlet flue gas temperature is high, the exhaust control valve is opened to reduce the volume of inert gas in the cooling water tank and increase the contact area between the circulating cooling water and the condensing section of the phase change heat pipe. When the power plant boiler load is low and the outlet flue gas temperature is low, the intake control valve is opened to increase the volume of inert gas in the cooling water tank and decrease the contact area between the circulating cooling water and the condensing section of the phase change heat pipe.

2. The phase change flue gas deep cooler with adjustable condensation area according to claim 1, characterized in that, The phase change heat pipe has its lower heat exchange section placed inside the flue gas chamber and its upper condensation section placed inside the cooling water tank.

3. The phase change flue gas deep cooler with adjustable condensation area according to claim 1, characterized in that, The phase change heat pipe has a lower heat exchange section that is a toothed spiral finned tube.

4. The phase change flue gas deep cooler with adjustable condensation area according to claim 1, characterized in that, The phase change heat pipe has a needle-shaped heat exchange section at the bottom.

5. The phase change flue gas deep cooler with adjustable condensation area according to claim 1, characterized in that, The gas storage tank is a container filled with inert gas.

6. The phase change flue gas deep cooler with adjustable condensation area according to claim 5, characterized in that, The inert gas is nitrogen, argon, or helium.

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