Low-pressure high-temperature steam heat exchange unit

Abstract

A low-pressure and high-temperature steam heat exchange unit comprises a low-pressure and high-temperature steam boiler and a heat exchanger, the low-pressure and high-temperature boiler comprises a boiler body, a burner connector is arranged on the boiler body, a steam outlet pipe for outputting low-pressure and high-temperature steam is arranged on the boiler body, and the heat exchanger is a tube plate type heat exchanger. A steam outlet pipe on the boiler body is connected to an inlet in a tube pass of the tube-sheet heat exchanger, a medium in the tube-sheet heat exchanger is connected to an inlet in a shell pass of the tube-sheet heat exchanger, an outlet in the tube pass of the tube-sheet heat exchanger is connected to the water tank through a pipeline provided with a valve, outlet water of the water tank is connected to the water pump, and inlet water of the boiler body is communicated with outlet water of the water pump. The temperature of low-pressure high-temperature steam generated by the boiler body of the unit is relatively high, the steam generating speed is high, the steam capacity in the boiler body is small, and safety is good.

Description

Technical Field

[0001] The utility model relates to heat exchange equipment, in particular to a low-pressure high-temperature steam heat exchange unit, belonging to the technical field of heat exchange. Background Art

[0002] At present, boilers generally use water as the medium for heat exchange and output hot water and steam. However, in many small-scale industrial and agricultural production scenarios, in addition to hot water and steam, high-temperature oil and high-temperature air are also required. High-temperature oil and high-temperature air are generally not suitable for flowing and exchanging heat in boilers. Low-pressure high-temperature steam boilers have relatively low pressure and carry a large amount of heat, making them suitable as heating sources. After the applicant's search, no heat exchange unit using low-pressure high-temperature steam as the heat source has been found. Summary of the Invention

[0003] The purpose of the utility model is to provide a low-pressure high-temperature steam heat exchange unit.

[0004] To achieve the purpose of the utility model, the following technical solutions are adopted: A low-pressure high-temperature steam heat exchange unit includes a low-pressure high-temperature steam boiler and a heat exchanger. The low-pressure high-temperature steam boiler includes a furnace body, on which a burner interface is configured. The furnace body has a steam outlet pipe for outputting low-pressure high-temperature steam. The heat exchanger is a tube-and-shell heat exchanger. The steam outlet pipe on the furnace body is connected to the inlet on the tube side of the tube-and-shell heat exchanger. The medium in the tube-and-shell heat exchanger is connected to the inlet on the shell side of the tube-and-shell heat exchanger. The outlet on the tube side of the tube-and-shell heat exchanger is connected to a water tank through a pipeline equipped with a valve. The water outlet of the water tank is connected to a water pump, and the water inlet of the furnace body is communicated with the water outlet of the water pump.

[0005] Furthermore, a pressure gauge is installed on the heat exchanger.

[0006] Furthermore, the furnace body is a three-pass horizontal furnace body. The front wall and the rear wall of the furnace body are both sandwich walls. The burner interface is located at the lower part of the front wall. The left and right side walls of the furnace body are both membrane walls. Water collecting pipes are respectively fixedly arranged on the left and right sides of the furnace body. The sandwich walls are communicated with the water collecting pipes. The lower ends of the heat exchange tubes on the membrane walls are connected to the water collecting pipes, and the upper ends are connected to the steam collecting pipes. Two smoke separating roofs are fixedly arranged in the furnace body in the up-and-down direction. The two smoke separating roofs divide the furnace body into a lower smoke chamber, a middle smoke chamber, and an upper smoke chamber. There are turning openings for the flue gas to flow back at the rear end of the lower smoke separating roof and the front end of the upper smoke separating roof. A heat exchange water pipe that reciprocally bends left and right is fixedly installed on the upper smoke chamber of the furnace body. The water inlet end of the heat exchange water pipe is the water inlet of the furnace body, and the water outlet of the heat exchange water pipe is connected to the water collecting pipe. A low-pressure high-temperature steam generating pipe that reciprocally bends in a U shape left and right is fixedly installed on the middle smoke chamber of the furnace body. The steam inlet of the low-pressure high-temperature steam generating pipe is connected to the steam collecting pipe, and the steam outlet is connected to the inlet on the tube side of the tube-and-shell heat exchanger. A liquid level gauge is installed on the furnace body.

[0007] Furthermore, the top surfaces of the smoke separation roof and the upper smoke chamber are both membrane wall structures. The heat exchange tubes on the membrane wall communicate with the sandwich wall respectively in the front and the back. The smoke separation roof is an inclined surface that is higher in the front and lower in the back.

[0008] The positive and beneficial technical effects of the present utility model are as follows: This unit heats multiple media such as water, air, and oil, flexibly adapting to the market needs. The low-pressure high-temperature steam generated by the furnace body has a relatively high temperature, a fast steam generation speed, a small steam capacity in the furnace body, and good safety. Description of the Drawings

[0009] Figure 1 It is an overall schematic diagram of an embodiment of the present utility model.

[0010] Figure 2 It is a schematic diagram of the cross-section of the heat exchanger of the present utility model.

[0011] Figure 3 It is a schematic diagram of the cross-section of the furnace body of the present utility model. Detailed Embodiment

[0012] 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 for the elaboration of the present utility model and do not limit the scope of the present utility model.

[0013] The present utility model is further explained in detail with reference to the accompanying drawings. The marks in the drawings are as follows: 1: furnace body; 2: tube-and-shell heat exchanger; 201: finned tube; 202: inlet on the tube side; 203: outlet on the tube side; 204: medium outlet; 3: water tank; 4: valve; 5: pressure gauge; 6: water pump; 7: lower header; 8: steam collector; 9: heat exchange water pipe; 10: low-pressure high-temperature steam generating pipe; 11: burner interface; 12: medium pump; 13: lower smoke box; 14: middle smoke box; 15: upper smoke box; 16: lower smoke separation roof; 17: upper smoke separation roof.

[0014] As shown in the attached drawings, a low-pressure high-temperature steam heat exchange unit includes a low-pressure high-temperature steam boiler and a heat exchanger 2. The heat exchanger is a tube-sheet heat exchanger. The low-pressure high-temperature steam boiler includes a furnace body 1, and a burner interface 11 is arranged on the furnace body. The combustion can be fuel combustion, gas combustion, or biomass combustion. The furnace body is a three-pass horizontal furnace body. The front wall and the rear wall of the furnace body are both sandwich walls. The burner interface 11 is located at the lower part of the front wall. The left wall and the right wall of the furnace body are both membrane walls. Water collecting pipes 7 are respectively fixedly arranged on the left and right sides of the furnace body. A blowdown pipe is connected to the water collecting pipe. The sandwich wall is communicated with the water collecting pipe. The lower ends of the heat exchange tubes on the membrane wall are connected to the water collecting pipe 7, and the upper ends are connected to the steam collecting pipe 8. Two smoke separating roofs distributed in the up-down direction are fixedly arranged in the furnace body. The smoke separating roofs are inclined planes with the front being high and the rear being low. The two smoke separating roofs are respectively the lower smoke separating roof 16 and the upper smoke separating roof 17. The two smoke separating roofs divide the inside of the furnace body into a lower smoke chamber 13, a middle smoke chamber 14, and an upper smoke chamber 15. There are turning openings for the flue gas to flow back at the rear end of the lower smoke separating roof and the front end of the upper smoke separating roof. The smoke separating roofs and the top surface of the upper smoke chamber are both of membrane wall structures. The heat exchange tubes on the membrane wall are respectively communicated with the sandwich wall at the front and the rear.

[0015] A heat exchange water pipe 8 that bends reciprocally in the left-right direction is fixedly installed on the upper smoke chamber of the furnace body. The water inlet end of the heat exchange water pipe is the water inlet of the furnace body, and the water outlet of the heat exchange water pipe 9 is connected to the water collecting pipe 7; A low-pressure high-temperature steam generating pipe 10 that bends reciprocally in a U shape in the left-right direction is fixedly installed on the middle smoke chamber of the furnace body. The steam inlet of the low-pressure high-temperature steam generating pipe 10 is connected to the steam collecting pipe 8, and the steam outlet is connected to the inlet on the tube side of the tube-sheet heat exchanger 2. The inlet on the tube side is shown as 202. A liquid level gauge is installed on the furnace body.

[0016] The steam outlet pipe on the furnace body 1 is connected to the inlet 202 on the tube side of the tube-sheet heat exchanger. The medium inside the tube-sheet heat exchanger is connected to the inlet on the shell side of the tube-sheet heat exchanger. Figure 1 Among them, 12 is shown as a medium pump. If the medium is water, a water pump is used as the medium pump. If the medium is oil, an oil pump is used as the medium pump. If the medium is air, an air pump is used. The medium enters the shell side of the tube-sheet heat exchanger and flows out from the medium outlet 204. A pressure gauge 5 is installed on the tube-sheet heat exchanger.

[0017] The outlet 203 on the tube side of the tube-sheet heat exchanger is connected to the water tank 3 through a pipeline installed with a valve 4. The water outlet of the water tank 3 is connected to the water pump 6. The water inlet of the furnace body is communicated with the water outlet of the water pump. The water inlet of the furnace body is the water inlet end of the heat exchange water pipe.

[0018] The low-pressure high-temperature steam generating pipe of this heat exchange unit is located in the middle smoke box. The generated low-pressure high-temperature steam has a high temperature (pressure less than 0.1 MPa, temperature ranging from 125 to 400 degrees Celsius). After the generated low-pressure high-temperature steam enters the tube side of the heat exchanger and exchanges heat with the medium, the exhausted steam formed enters the water tank to preheat the water. The water in the water tank enters the collecting pipe after being exchanged heat through the water pump and the heat exchange water pipe, forms steam in the upper part after heat exchange in the furnace body, enters the steam collecting pipe, and then enters the low-pressure high-temperature steam generating pipe through the steam collecting pipe.

[0019] 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 modification, equivalent change and modification 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 low-pressure high-temperature steam heat exchange unit, comprising a low-pressure high-temperature steam boiler and a heat exchanger, wherein the low-pressure high-temperature steam boiler comprises a furnace body, a burner interface is arranged on the furnace body, and a steam outlet pipe for outputting low-pressure high-temperature steam is arranged on the furnace body, and the heat exchanger is a tube-plate heat exchanger, characterized in that: The steam outlet pipe on the furnace body is connected to the inlet on the tube side of the tube-sheet heat exchanger, the medium in the tube-sheet heat exchanger is connected to the inlet on the shell side of the tube-sheet heat exchanger, the outlet on the tube side of the tube-sheet heat exchanger is connected to the water tank through a pipeline equipped with a valve, the water outlet of the water tank is connected to the water pump, and the water inlet of the furnace body is connected to the water outlet of the water pump.

2. A low-pressure and high-temperature steam heat exchange unit according to claim 1, characterized in that: A pressure gauge is installed on the heat exchanger.

3. A low-pressure and high-temperature steam heat exchange unit according to claim 1, characterized in that: The furnace body is a three-pass horizontal furnace body, the front wall and the rear wall of the furnace body are both sandwich walls, the burner interface is located at the lower part of the front wall, the left wall and the right wall of the furnace body are both membrane walls, and water collecting pipes are fixedly arranged on the left and right sides of the furnace body respectively. The sandwich wall is connected to the water collecting pipe, and the lower end of the heat exchange tube on the membrane wall is connected to the water collecting pipe, and the upper end is connected to the steam collecting pipe. Two smoke-isolating roofs distributed in the upper and lower directions are fixedly arranged in the furnace body, and the two smoke-isolating roofs divide the furnace body into a lower smoke chamber, a middle smoke chamber, and an upper smoke chamber. The rear end of the lower smoke-isolating roof, The front end of the upper smoke-barrier top is provided with a return port for the return flow of smoke. A hot water exchange pipe that is bent back and forth in the left and right direction is fixedly installed on the upper smoke chamber of the furnace body. The water inlet end of the hot water exchange pipe is the water inlet of the furnace body, and the water outlet of the hot water exchange pipe is connected to the water collecting pipe; a low-pressure and high-temperature steam generating pipe that is bent back and forth in the left and right direction is fixedly installed on the middle smoke chamber of the furnace body. The steam inlet of the low-pressure and high-temperature steam generating pipe is connected to the steam collecting pipe, and the steam outlet is connected to the inlet on the tube side of the tube-plate heat exchanger. A liquid level meter is installed on the furnace body.

4. A low-pressure and high-temperature steam heat exchange unit according to claim 3, characterized in that: The top surfaces of the smoke-isolating roof and the upper smoke chamber are both membrane wall structures. The heat exchange tubes on the membrane wall are connected to the interlayer wall at the front and back respectively. The smoke-isolating roof is a slope with a high front and a low back.

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