Horizontal low-pressure high-temperature steam furnace body
By adopting a horizontal structure and multi-smoke chamber design in a low-pressure and high-temperature steam boiler, heat exchange water pipes and finned pipes are used for heat exchange, solving the problems of high smoke exhaust temperature and limited steam temperature increase, achieving more efficient steam generation and safety improvement.
Patent Information
- Application Number
- CN202422100912.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-08-29
AI Technical Summary
The existing low-pressure and high-temperature steam boilers have high smoke exhaust temperature, limited room for steam temperature improvement, and there is a safety hazard for steam in the steam drum.
Adopting a horizontal structure, multiple smoke chambers and heat exchange pipes are installed in the furnace body, including lower smoke chamber, medium smoke chamber, and upper smoke chamber. The heat exchange water pipe and heat exchange steam pipe are used for heat exchange, the drum structure is cancelled, and the finned tube is used as the heat exchange steam pipe. The flow path of the flue gas in different smoke chambers is designed to reduce the smoke exhaust temperature and increase the steam temperature.
Lower smoke exhaust temperature and higher steam temperature are achieved, which improves the steam generation speed and enhances the safety of the furnace body.
Smart Images
Figure CN223090637U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a heat exchange device, in particular to a horizontal low-pressure high-temperature steam furnace body, belonging to the technical field of boilers. Background Art
[0002] Low-pressure high-temperature steam boilers are commonly used heat energy devices in industry and agriculture. Their relatively low pressure and high temperature ensure safety and provide more heat energy for heat exchange. Small-tonnage low-pressure high-temperature steam generators are particularly suitable for use in the production of decentralized small and medium-sized enterprises. The low-pressure high-temperature steam boiler generates low-pressure high-temperature steam through heat exchange in the furnace body by burning fuel with a burner. CN219955289U discloses a heat exchange furnace body structure of a low-pressure high-temperature steam generator. The technical solution includes two water collecting pipes located on the left and right sides at the bottom. The left and right side walls of the furnace body are membrane walls formed by multiple heat exchange pipes. A steam collecting drum is fixedly installed at the upper end of the furnace body. The upper ends of the heat exchange pipes on the membrane wall are connected to the outer cylinder of the steam collecting drum and communicate with the interlayer. An outlet pipe is connected to the steam collecting drum. A liquid level gauge installation pipe is installed between the steam collecting drum and the water collecting pipes. Two upper and lower layers of heat exchange pipes are installed between the two side membrane walls. Multiple heat exchange pipes communicate with the water collecting pipes. The upper layer of heat exchange pipes is a layer of U-shaped bent aluminum alloy pipes. One end of the aluminum alloy pipe is connected to the outlet pipe of the steam collecting drum, and the steam outlet is located at the other end of the aluminum alloy pipe. There is a smoke inlet above the aluminum alloy pipe that communicates with the inner cylinder in the steam collecting drum. The periphery of the membrane wall is enclosed by a refractory wall. A lower refractory roof is laid on the upper part of the heat exchange pipes, and an upper refractory roof is laid on the upper part of the aluminum alloy pipes. In this furnace body structure, a steam collecting drum is adopted. The steam in the steam collecting drum enters the aluminum alloy pipes in the furnace body to obtain low-pressure high-temperature steam. This furnace body can be adapted to various burners (such as biomass burners, gas burners, etc.). However, this heat exchange furnace body still needs to be optimized in terms of support. First, the presence of a large amount of steam in the steam collecting drum is an unsafe factor. Second, the steam becomes superheated steam after heat exchange in the aluminum alloy pipes. Since the aluminum alloy pipes are located near the smoke outlet in the height direction of the furnace body, the flue gas temperature of the furnace body using this structure is relatively high. The temperature in the furnace body decreases from bottom to top. Although the aluminum alloy pipes are relatively upper and can obtain low-pressure high-temperature steam, there is still room for improvement in the steam temperature. Summary of the Invention
[0003] The purpose of the utility model is to provide a horizontal low-pressure high-temperature steam furnace body, which relatively has a lower flue gas temperature and a higher steam temperature.
[0004] To achieve the object of the present utility model, the following technical solution is adopted: A horizontal low-pressure high-temperature steam furnace body includes two water collecting pipes located on the left and right sides at the bottom. The left and right side walls of the furnace body are both membrane walls formed by multiple heat exchange pipes. The front and rear walls of the furnace body are both interlayers. Two isolation tops are fixedly arranged up and down in the furnace body. The two isolation tops divide the furnace body into three flue gas chambers: a lower flue gas chamber, a middle flue gas chamber, and an upper flue gas chamber. There are flue gas passing ports for flue gas to pass through at the rear of the lower isolation top and the front of the upper isolation top. The isolation top is an inclined plane with the front higher than the rear. There is an interface at the lower front end of the furnace body. The interlayer is communicated with the two water collecting pipes. The heat exchange pipes on the membrane walls on both sides are respectively connected to two steam collecting pipes. The two isolation tops and the top of the upper flue gas chamber are all of membrane wall structure. The heat exchange pipes in the membrane wall structure are respectively connected to the interlayers of the front and rear walls before and after. There is a flue gas outlet on the upper part of the upper flue gas chamber. A water heat exchange pipe that reciprocally bends in the left and right directions is fixedly installed in the upper flue gas chamber. The water inlet end of the water heat exchange pipe is located outside the furnace body, and the water inlet end is connected to the water inlet of the furnace body. The water outlet end of the water heat exchange pipe is connected to one of the water collecting pipes through a pipeline. A steam heat exchange pipe that reciprocally bends in the left and right directions is fixedly arranged in the middle flue gas chamber. The steam inlet end of the steam heat exchange pipe is connected to the steam collecting pipe. The steam outlet pipe of the furnace body is connected to the steam outlet end of the steam heat exchange pipe. A liquid level gauge is installed on the furnace body.
[0005] Further; a plurality of heat exchange pipe bodies are fixedly installed around the interface in the lower flue gas chamber. The front and rear of the plurality of heat exchange pipe bodies are respectively connected to the interlayers of the front and rear walls.
[0006] Further; there is a furnace door installation opening on the rear wall of the middle flue gas chamber.
[0007] Further; the steam heat exchange pipe is a finned tube.
[0008] Further; the membrane walls of the left and right side walls are both divided into two sections in height. The two sections are connected by an intermediate collecting pipe. The number of heat exchange pipes on the lower membrane wall is more than the number of heat exchange pipes on the upper membrane wall.
[0009] The positive and beneficial technical effects of the present utility model are as follows: The water heat exchange pipe can fully absorb heat in the upper flue gas chamber, thereby relatively reducing the flue gas discharge temperature. After the water heat exchange pipe exchanges heat with the inlet water, it enters the water collecting pipe, increasing the inlet water temperature and making the steam generation faster. The steam heat exchange pipe is located in the middle flue gas chamber, and the temperature in the middle flue gas chamber is relatively high, so a relatively high steam temperature can be obtained. Moreover, this furnace body has no steam drum, the amount of steam in the whole furnace body is small, and the safety performance is good. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 is one of the overall schematic diagrams of the present utility model.
[0011] Figure 2 is the second overall schematic diagram of the present utility model.
[0012] Figure 3 It is a schematic diagram of the inner wall of the present utility model. Specific embodiments
[0013] To more fully explain the implementation of the present utility model, implementation examples of the present utility model are provided. These implementation examples are only elaborations of the present utility model and do not limit the scope of the present utility model.
[0014] With reference to the accompanying drawings, the present utility model is further explained in detail. The marks in the drawings are: 1: collecting water pipe; 2: intermediate collecting pipe; 3: steam collecting pipe; 4: interface; 5: sewage discharge pipe; 6: top of the upper smoke chamber; 7: water inlet end; 8: heat exchange water pipe; 9: water outlet end; 10: pipeline connecting the heat exchange water pipe and the lower collecting pipe; 11: heat exchange steam pipe; 12: flue gas outlet; 13: steam outlet pipe; 14: furnace door installation opening; 15: membrane wall of the lower section; 16: membrane wall of the upper section; 17: pipeline connecting the steam collecting pipe and the heat exchange steam pipe; 18: lower smoke chamber; 19: middle smoke chamber; 20: upper smoke chamber; 21: lower isolation top; 22: upper isolation top; 23: heat exchange tube body; 24: front wall; 25: rear wall; 26: liquid level gauge installation pipe.
[0015] As shown in the accompanying drawings, a horizontal low-pressure high-temperature steam furnace body includes two collecting water pipes 1 located on the left and right sides of the bottom. The left and right side walls of the furnace body are both membrane walls formed by multiple heat exchange pipes. The front wall 24 and the rear wall 25 of the furnace body are both interlayers. The membrane walls on the left and right side walls are divided into two sections in height. In the figure, 15 shows the membrane wall of the lower section and 16 shows the membrane wall of the upper section. The two sections are connected by an intermediate collecting pipe 2. The number of heat exchange pipes on the membrane wall of the lower section is more than the number of heat exchange pipes on the membrane wall of the upper section.
[0016] There are two isolation tops arranged vertically and fixedly in the furnace body. The two isolation tops divide the furnace body into three flue chambers: the lower flue chamber 18, the middle flue chamber 19, and the upper flue chamber 20. Around the interface in the lower flue chamber, multiple heat exchange tube bodies 23 are fixedly installed. There is a furnace door installation opening 14 on the rear wall of the middle flue chamber; the front and rear of the multiple heat exchange tube bodies are respectively connected to the interlayers of the front wall and the rear wall. At the rear of the lower isolation top 21 and at the front of the upper isolation top 22, there are smoke passing openings for the flue gas to pass through. The two isolation tops are inclined planes with the front higher than the rear. At the lower front end of the furnace body, there is an interface 4, which is used to connect with the combustion. The interlayers of the front wall and the rear wall are communicated with the two water collecting pipes. The heat exchange tubes on the membrane walls on both sides are respectively connected to the two steam collecting pipes 3. The two isolation tops and the top 6 of the upper flue chamber are both of membrane wall structures. In the membrane wall structures, the heat exchange tubes are respectively connected to the interlayers of the front wall and the rear wall at the front and rear. There is a flue gas outlet 12 on the upper part of the upper flue chamber. In the upper flue chamber, a water exchange pipe 8 that bends reciprocally in the left-right direction is fixedly installed. The water inlet end 7 of the water exchange pipe 8 is located outside the furnace body, and the water inlet end is connected to the water inlet of the furnace body. The water outlet end 9 of the water exchange pipe is connected to one of the water collecting pipes through a pipeline. 10 shows the pipeline for connecting the water exchange pipe to the lower water collecting pipe; in the middle flue chamber 19, a heat exchange steam pipe 11 that bends reciprocally in the left-right direction is fixedly installed. The heat exchange steam pipe is a finned tube. The steam inlet end of the heat exchange steam pipe 11 is connected to the steam collecting pipe. 17 shows the pipeline for connecting the steam collecting pipe to the heat exchange steam pipe; the steam outlet pipe 13 of the furnace body is connected to the steam outlet end of the heat exchange steam pipe. A liquid level gauge is installed on the furnace body. 26 shows the liquid level gauge installation pipe.
[0017] The flue gas flow direction of this furnace body is as shown by the arrow in Figure 3 . The water inlet enters from the water inlet end, passes through the water exchange pipe, the membrane wall (interlayer), the steam collecting pipe, and the heat exchange steam pipe, and then flows out from the steam outlet pipe.
[0018] After the embodiments of the present invention are described in detail, those skilled in the art can clearly understand that various changes and modifications can be made without departing from the scope and spirit of the above-mentioned patent application. Any simple modifications, equivalent changes, and decorations made to the above embodiments based on the technical essence of the present invention all belong to the scope of the technical solution of the present invention, and the present invention is not limited to the embodiments described in the specification either.
Claims
1. A horizontal low-pressure high-temperature steam furnace body, comprising two water collecting pipes located on the left and right sides of the bottom. The left and right side walls of the furnace body are both membrane walls formed by multiple heat exchange pipes. The front and rear walls of the furnace body are both interlayers. Two isolation tops are fixedly arranged in the furnace body and distributed vertically. The two isolation tops divide the furnace body into three flue gas chambers: a lower flue gas chamber, a middle flue gas chamber, and an upper flue gas chamber. There are flue gas passing ports for the flue gas at the rear of the lower isolation top and the front of the upper isolation top. The isolation tops are inclined planes with the front being higher than the rear. There is an interface at the lower front end of the furnace body. The interlayers are communicated with the two water collecting pipes. It is characterized in that: The heat exchange tubes on the membrane walls on both sides are respectively connected to two steam collecting pipes. The tops of the two isolation roofs and the upper smoke chamber are both of membrane wall structure. In the membrane wall structure, the heat exchange tubes are respectively connected to the interlayers of the front wall and the rear wall before and after. There is a flue gas outlet on the upper part of the upper smoke chamber. A heat exchange water pipe that bends reciprocally in the left-right direction is fixedly installed in the upper smoke chamber. The water inlet end of the heat exchange water pipe is located outside the furnace body, and the water inlet end is connected to the water inlet of the furnace body. The water outlet end of the heat exchange water pipe is connected to one of the water collecting pipes through a pipeline. A heat exchange steam pipe that bends reciprocally in the left-right direction is fixedly arranged in the middle smoke chamber. The steam inlet end of the heat exchange steam pipe is connected to the steam collecting pipe, and the steam outlet pipe of the furnace body is connected to the steam outlet end of the heat exchange steam pipe. A liquid level gauge is installed on the furnace body.
2. The horizontal low-pressure high-temperature steam furnace body according to claim 1, characterized in that: A plurality of heat exchange tube bodies are fixedly installed around the interface in the lower smoke chamber. The front and rear of the plurality of heat exchange tube bodies are respectively connected to the interlayers of the front wall and the rear wall.
3. A horizontal low-pressure high-temperature steam furnace body according to claim 1, characterized in that: There is a furnace door installation opening on the rear wall of the middle smoke chamber.
4. A horizontal low-pressure high-temperature steam furnace body according to claim 1, characterized in that: The heat exchange steam pipe described above is a finned tube.
5. A horizontal low-pressure high-temperature steam furnace body according to claim 1, characterized in that: The membrane walls of the left side wall and the right side wall are divided into two sections in height. The two sections are connected by an intermediate header. The number of heat exchange tubes on the membrane wall of the lower section is more than the number of heat exchange tubes on the membrane wall of the upper section.