KR-20260065113-A - Waste Heat Recovery System for High-Temperature Humid Gas

Abstract

The present invention relates to a high-temperature humid gas waste heat recovery system configured to effectively recover the waste heat of humid gas with a simple configuration by exchanging the waste heat of high-temperature humid gas discharged from a high-temperature humid gas discharge facility through a plate heat exchanger and minimizing the reduction in heat exchange efficiency caused by condensation occurring on the surface of the plate heat exchanger. The system comprises: a heat exchanger (10) including a multi-stage heat exchanger module (100) spaced apart from each other between a gas inlet (13) and a gas outlet (14); and a circulation pump (40) for circulating cooling water of the heat exchanger (10).

Inventors

• 정순희
• 정진희

Assignees

• (주)힉스프로

Dates

Publication Date

20260508

Application Date

20241031

Claims (7)

1. A heat exchanger (10) that recovers waste heat by introducing high-temperature humid gas generated from a high-temperature humid gas discharge facility (1); and A circulation pump (40) for circulating the cooling water of the heat exchanger (10); comprising, The above heat exchanger (10) is, Gas inlet (13) formed at the bottom; Gas outlet (14) formed at the top; and It includes a plurality of heat exchanger modules (100) formed in multiple stages spaced apart from each other between the gas inlet (13) and the gas outlet (14). A high-temperature humid gas waste heat recovery system characterized by the high-temperature humid gas passing through a plurality of heat exchanger modules (100) via the gas inlet (13) and heat-exchanging so that low-temperature dehumidified gas is discharged through the gas outlet (14).
2. In Article 1, The above heat exchanger module (110) is, Plate heat exchanger (110); A lower support member (130) configured to support the lower edge of the plate heat exchanger (110); and A high-temperature humid gas waste heat recovery system characterized by including an upper support (140) configured to support the upper edge of the plate heat exchanger (110).
3. In Paragraph 2, At least one heat exchanger module (110) among the above multi-stage heat exchanger modules (110) is, A plurality of condensate trays (120) are additionally provided at the bottom of the plate heat exchanger (110) so as to receive and store condensate (c) that is generated and flows down on the surface of the plate heat exchanger (110). A plurality of tray support grooves (132) configured to support the end of each condensate tray (120) are additionally formed in each of the above lower support members (130), and A high-temperature humid gas waste heat recovery system characterized by additionally forming a condensate discharge channel (133) in at least one of the lower support members (130) for collecting and discharging condensate (c) transferred from each condensate tray (120).
4. In Paragraph 3, The above condensate tray (120) is, A condensate storage portion (121) for storing condensate (c); and A high-temperature humid gas waste heat recovery system characterized by having an open end (122) formed so that the condensate (c) stored in the condensate storage portion (121) can be transferred to the condensate discharge path (133).
5. In any one of paragraphs 1 through 4, The above heat exchanger (10) includes, A high-temperature humid gas waste heat recovery system characterized by additionally having a filter (150) for removing foreign substances contained in the incoming high-temperature humid gas.
6. In any one of paragraphs 1 through 4, The above heat exchanger (10) includes, A high-temperature humid gas waste heat recovery system characterized by having additional cleaning equipment for cleaning.
7. In any one of paragraphs 1 through 4, A high-temperature humid gas waste heat recovery system characterized by additionally having a low-temperature heat source (30) configured to circulate the cooling water of the heat exchanger (10) and recycle the heat energy recovered from the heat exchanger (10).

Description

Waste Heat Recovery System for High-Temperature Humid Gas The present invention relates to a high-temperature humid gas waste heat recovery system, and more specifically, to a high-temperature humid gas waste heat recovery system configured to effectively recover the condensation heat of high-temperature humid steam or exhaust gas through a multi-stage plate heat exchanger. Paper mills generate high-temperature, high-humidity steam during the drying process, and various other industrial sites also produce high-temperature, high-humidity exhaust gases, such as combustion exhaust gases. If high-temperature and high-humidity steam or flue gas is discharged as is, there is significant energy loss due to the waste of thermal energy. Furthermore, as high-temperature steam is released into the atmosphere, not only is there a high possibility of white smoke generation, but it can also affect the humidity and temperature of surrounding areas and lead to problems resulting from stricter environmental regulations. Due to these problems, many industrial sites are installing waste heat recovery systems to recover waste heat from high-temperature humid gas instead of discharging it as is. As an example of this, Registered Patent Publication No. 10-1294005 discloses a fluidized bed heat exchanger for combustion flue gas heat recovery for high-temperature water production (hereinafter referred to as the ‘prior art’). As shown in FIG. 1, the prior art includes a fluidized bed heat exchanger that sequentially passes waste heat from a combustion flue gas containing high-temperature steam discharged from a combustion device through a fluidized bed of a heat medium and a fluidized bed of water, and then heats the hot water produced from the latent heat of condensation of the combustion flue gas in the fluidized bed of water to the saturated temperature of humid air, and then heats it again in a fluidized bed of a heat medium where there is no steam condensation phenomenon to produce hot water of a high temperature above the saturated temperature of humid air. The conventional technology has the advantage of solving the problem of low-temperature corrosion on the surface of the heat transfer tubes of a fluidized bed heat exchanger by first recovering the latent heat of condensation of the flue gas by passing the high-temperature combustion flue gas containing steam through a water fluidized bed to produce hot water at a temperature of about 55°C or lower, which is the saturation temperature of humid air, and then heating the produced hot water by passing it through a heat transfer fluidized bed to produce high-temperature hot water at a temperature of about 80°C or higher in a second step, and by fluidizing the corrosive flue gas with water and the heat transfer medium to suppress the concentration of corrosive components. However, conventional technology requires an unusual configuration in which each fluidized bed is designed to allow flue gas to pass sequentially through a liquid fluidized bed and a water fluidized bed while being discharged upwards, so that the flue gas can pass through without leakage downwards. Furthermore, since the flue gas passing through each fluidized bed inevitably contains a large amount of moisture, although it is described that the moisture contained in the flue gas is removed as droplets at each demister, there is a problem in that there are limitations to droplet removal. Fig. 1. Schematic structural diagram of a fluidized bed heat exchanger having multiple water fluidized beds and heat transfer fluidized beds formed according to the prior art. FIG. 2. Structural diagram of a high-temperature humid gas waste heat recovery system according to the present invention. FIG. 3. Cross-sectional view of a heat exchanger module equipped with a plate heat exchanger (110) according to the present invention. (a) Front view (b) Side view FIG. 4. Perspective view of a condensate tray (120) and a lower support (130) installed at the bottom of a plate heat exchanger (110) according to the present invention. FIG. 5. Front view of the lower portion of the heat exchanger module (100) according to the present invention. FIG. 6. Change in thickness of condensate (c) occurring on the surface of a plate heat exchanger (100) (a) Multistage plate heat exchanger (b) Large plate heat exchanger The present invention will be described below with reference to the attached drawings. However, the present invention can be implemented in various different forms and is therefore not limited to the embodiments described herein. Throughout the specification, when it is stated that a part is "connected (connected, in contact, combined)" with another part, this includes not only cases where they are "directly connected," but also cases where they are "indirectly connected" with other members interposed between them. Furthermore, when it is stated that a part "includes" a certain component, this means that, unless specifically stated