KR-102963097-B1 - Waste Heat Recovery Feedwater Tank for Stem Boiler

Abstract

The present invention relates to a waste heat recovery type water tank for a steam boiler configured to recover and reuse waste heat from condensate accumulated in the piping of the steam boiler. A waste heat recovery type water supply tank for a steam boiler according to the present invention for solving the above problem comprises a storage tank; a water supply pipe; and a heat exchange pipe, and is characterized in that condensate is introduced through one end of the heat exchange pipe and undergoes a primary heat exchange with water discharged through the water supply pipe, flows along a meandering path formed inside the storage tank and undergoes a secondary heat exchange with water stored inside the storage tank, and then is discharged to the outside of the storage tank.

Inventors

• 김갑진

Dates

Publication Date

20260512

Application Date

20250929

Claims (4)

1. A storage tank (10) having a receiving space formed therein for storing a predetermined amount of water; A water supply pipe (20) installed on one side of the lower portion of the storage tank (10) and having a predetermined length in a horizontal direction to penetrate the interior and exterior of the storage tank (10), supplying water stored in the storage tank (10) toward the boiler; and A heat exchange pipe (30) is formed with a relatively small diameter to penetrate the interior of the water supply pipe (20), with one end protruding to the outside of the storage tank (10) and the other end connected to the interior of the storage tank (10) along the water supply pipe (20) to form a meandering flow path of a predetermined length, and then installed to protrude to the outside through one side of the upper part of the storage tank (10) for discharging condensate from the boiler; Includes, Condensate is introduced through one end of the heat exchange pipe (30) and undergoes a primary heat exchange with water discharged through the water supply pipe (20), then flows along a meandering path formed inside the storage tank (10) and undergoes a secondary heat exchange with water stored inside the storage tank (10), and is then configured to be discharged to the outside of the storage tank (10). The above heat exchange pipe (30) is, An inlet section (31) of a predetermined length through which condensate flows, installed to protrude downward for a predetermined length by vertically penetrating one end of the above-mentioned water supply pipe (20); A first heat exchanger (32) having a predetermined length such that one end is connected to the inlet (31) and the other end is connected to the storage tank (10) along the water supply pipe (20); A second heat exchanger (33) of a predetermined length, one end of which is connected to the other end of the first heat exchanger (32) and the other end of which forms a meandering flow path on the bottom surface of the storage tank (10); and A drainage section (34) of a predetermined length, with one end connected to the other end of the second heat exchange section (33) and the other end penetrating one side of the upper part of the storage tank (10) and protruding to the outside; A waste heat recovery type feedwater tank for a steam boiler characterized by including
2. delete
3. In claim 1, The above first heat exchanger (32) is, A waste heat recovery type water tank for a steam boiler, characterized by having a plurality of heat dissipation plates (32A) installed at predetermined intervals along the outer surface.
4. In claim 1, The above second heat exchanger (33) is, A first horizontal heat exchanger (33A) of a predetermined length located on the inner bottom surface of the storage tank (10) and forming a meandering flow path in the horizontal direction; A second horizontal heat exchanger (33B) of a predetermined length located on the upper side of the interior of the storage tank (10) and forming a meandering flow path in the horizontal direction; and A plurality of vertical heat exchangers (33C) are installed at predetermined intervals along a meandering flow path to vertically connect the first and second horizontal heat exchangers (33A, 33B), so that condensate is distributed and flows from the first horizontal heat exchanger (33A) toward the second horizontal heat exchanger (33B); A waste heat recovery type feedwater tank for a steam boiler characterized by including

Description

Waste Heat Recovery Feedwater Tank for Steam Boiler The present invention relates to a waste heat recovery type water supply tank for a steam boiler, and more specifically, to a water supply tank for replenishing water to a steam boiler, configured to recover waste heat from condensate (drain water) generated during steam evaporation of the steam boiler and preheat the water stored in the water supply tank. A steam boiler is a device that heats water stored in a water tank as fuel is burned and supplies this heated water to the user through pipes, enabling the user to use hot water or heating. For such boilers, various technologies are being developed with the aim of increasing heating efficiency while reducing the amount of fuel used to heat the water tank through combustion. As prior art for the above purpose, a waste heat recovery boiler disclosed in Published Utility Model Publication No. 1999-0036782 (hereinafter referred to as the 'Patent Document') is disclosed. The above patent document describes a boiler that exhausts waste heat to the atmosphere and is equipped with a supplementary water tank and a hot water tank, wherein an exhaust pipe is installed at the top, an inlet pipe with a narrow inlet portion is installed on one side to allow waste heat to flow in and is connected to the boiler, a plurality of recovery pipes are installed inside to be supported by first and second support members on both sides, and a collection portion is formed at the bottom with a drain valve installed; and an auxiliary hot water tank is installed on one side of the recovery portion such that the recovery pipes, the supplementary water tank, and the hot water tank are interconnected. In the case of conventional waste heat recovery boilers as described above, they are generally configured to heat water stored in an auxiliary hot water tank using the waste heat of combustion gases discharged to the outside, or to recover waste heat through heat exchange during the process of recovering circulating water, with the aim of saving fuel used to heat the water. Meanwhile, in the case of a steam boiler, a large amount of moisture condenses and remains in the pipes as high-temperature steam is supplied along the pipes. This condensed water (condensate) has high electrical conductivity and concentration, which reduces recycling efficiency, and for this reason, it is periodically discharged to the outside through the drain pipe. However, the condensate (drain water) discharged in this way contains a large amount of thermal energy, and consequently, the thermal energy contained in the condensate is being lost as is. In addition, in order to discharge condensate, it needs to be cooled to a temperature (40℃ or lower) that complies with wastewater discharge regulations; therefore, in the case of large-scale steam boiler facilities, there is also the issue that a separate storage tank must be installed to cool the condensate by storing it for a specified period of time. Therefore, there is a need to develop a waste heat recovery feedwater tank for steam boilers that recovers waste heat contained in the condensate discharged externally to reduce thermal energy loss, and simultaneously allows the condensate to be discharged immediately after lowering its temperature to a level permitted by wastewater discharge regulations without the need to install a separate storage tank. FIGS. 1 and FIGS. 2 are drawings showing examples of a waste heat recovery type water supply tank for a steam boiler according to the present invention. FIG. 3 is a drawing showing an example in which a heat sink is formed in a first heat exchanger according to the present invention. FIGS. 4 to 6 are drawings showing other embodiments of a waste heat recovery type water supply tank for a steam boiler according to the present invention. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention aims to provide a waste heat recovery type water tank for a steam boiler configured to recover and reuse waste heat from condensate accumulated in the pipes of the steam boiler. As shown in FIGS. 1 and 2, the present invention includes a storage tank (10), a water supply pipe (20), and a heat exchange pipe (30). The storage tank (10) is configured to store a predetermined amount of water inside in order to supply water to a steam boiler (not shown) as needed. The storage tank (10) may be configured as a cylindrical tank having a predetermined diameter, or alternatively, as a tank having a square cross-section. In addition, an opening of a predetermined size (not shown in the drawing) is formed in the upper part of the storage tank (10), and a cover of a predetermined size (not shown in the drawing) is installed in this opening, thereby allowing the contaminants accumulated inside the storage tank (10) to be cleaned as needed. And a raw water pipe (not shown) is connected to one side