Flat-plate combustion vacuum phase change steam generator

Abstract

A flat plate combustion vacuum phase change steam generator comprises a furnace body, a plurality of vertical finned tubes are installed in the furnace body, the upper ends of the finned tubes are connected to an upper collecting box, the lower ends of the finned tubes are connected to a lower collecting box, a high-temperature heat exchanger is fixedly connected to the rear portion of the furnace body, heat exchange tubes are fixedly installed in the high-temperature heat exchanger, and a condenser is fixedly connected to the rear portion of the high-temperature heat exchanger. A heat exchange water pipe which is bent in a reciprocating mode is installed on the condenser, a plurality of steam heat exchangers are fixedly arranged outside the boiler body, each steam heat exchanger comprises an upper cavity and a lower cavity, the upper cavities and the lower cavities are communicated through a plurality of heat exchange pipe bodies, and the upper cavities and the lower cavities are both fixedly connected to a shell surrounding the heat exchange pipe bodies in a sealed mode. The upper portion of the shell is communicated with the upper collecting box, the lower portion of the shell is communicated with the lower collecting box, the lower cavity is connected to a water outlet of the water pump, the upper cavity is connected to the steam collecting pipe, the steam collecting pipe is connected to a heat exchange pipe on the high-temperature heat exchanger, the steam outlet pipe is connected to an outlet of the heat exchange pipe, and the steam generator is good in effect.

Description

Technical Field

[0001] The utility model relates to a steam generator, in particular to a flat combustion vacuum box type variable steam generator, belonging to the technical field of heat exchange equipment. Background Art

[0002] A vacuum boiler is a common heat exchange device that operates under a state lower than atmospheric pressure and has advantages such as fast evaporation, high thermal efficiency, and good safety. Currently, the heat exchange between the steam generated in the vacuum boiler and the heat medium generally occurs at the top of the boiler. After the heat-exchanged steam condenses into water droplets and then falls back into the boiler, the water is heated by the steam and then flows out as hot water. Therefore, the current vacuum boilers are generally used as hot water boilers, and steam generators of the vacuum phase change type (vacuum boilers) are rarely seen. Summary of the Invention

[0003] The purpose of the utility model is to provide a flat combustion vacuum box type variable steam generator, which utilizes the characteristics of a vacuum boiler to generate steam.

[0004] To achieve the purpose of the utility model, the following technical solution is adopted: A flat combustion vacuum phase change steam generator includes a furnace body. A plurality of vertical finned tubes are installed in the furnace body. The upper ends of the finned tubes are connected to the upper header and the lower ends are connected to the lower header. A flat burner is installed at the front end of the furnace body. A high-temperature heat exchanger is fixedly connected behind the furnace body. Heat exchange tubes are fixedly installed in the high-temperature heat exchanger. A condenser is fixedly connected behind the high-temperature heat exchanger. A reciprocally bent heat exchange water pipe is installed on the condenser. The water inlet of the steam generator is connected to one end of the heat exchange water pipe. The flue gas generated by the combustion of the flat burner sequentially passes through the furnace body, the high-temperature heat exchanger, and the condenser. A plurality of steam heat exchangers are fixedly arranged outside the furnace body. The steam heat exchanger includes an upper cavity and a lower cavity. The upper cavity and the lower cavity are connected by a plurality of heat exchange tube bodies. The upper cavity and the lower cavity are both hermetically and fixedly connected to the outer shell surrounding the heat exchange tube bodies. The upper part of the outer shell is connected to the upper header through a pipeline, and the lower part is connected to the lower header through a pipeline. The lower cavity is connected to the water outlet of the water pump. The water inlet of the water pump is directly or indirectly connected to the water outlet of the heat exchange water pipe on the condenser. The upper cavities of a plurality of steam heat exchangers are all connected to a steam collecting pipe through pipelines. The steam collecting pipe is connected to the inlet of the heat exchange tube on the high-temperature heat exchanger, and the steam outlet pipe is connected to the outlet of the heat exchange tube on the high-temperature heat exchanger. A vacuum gauge is installed on the upper header, a pressure gauge is installed on the steam collecting pipe, and a liquid level gauge is installed on the steam heat exchanger.

[0005] Further, an deaerator is arranged in front of the water pump. The water pump is connected to the water outlet of the deaerator. The water inlet of the deaerator is connected to the water outlet of the heat exchange water pipe on the condenser. An automatic exhaust valve is installed on the deaerator.

[0006] Further, the number of the steam heat exchangers is 5.

[0007] Furthermore, a safety valve is also installed on the steam collecting pipe.

[0008] Furthermore, the high-temperature heat exchanger includes two groups of heat exchange tube groups distributed front and back. Each group of heat exchange tube groups is composed of multiple heat exchange tubes distributed left and right. The upper ends of the heat exchange tubes are connected to the upper horizontal tube, and the lower ends are connected to the lower horizontal tube. The lower horizontal tubes of the two groups of heat exchange tube groups are connected and communicated, the steam collecting pipe is connected to the upper horizontal tube of the rear heat exchange tube group, and the steam outlet pipe is connected to the upper horizontal tube of the front heat exchange tube group.

[0009] The positive and beneficial technical effects of the present utility model are as follows: This steam generator uses vacuum phase change heat transfer to generate steam. During operation, the furnace body is in a negative pressure (lower than atmospheric pressure) state, and has many advantages such as good safety of the vacuum boiler. By using a steam heat exchanger outside the furnace body to generate steam, steam can be generated while making the entire device easy to manufacture and install. 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 is a schematic diagram of a front-to-back section of the furnace body.

[0013] Figure 4 is a schematic diagram of a front-to-back section of the steam heat exchanger. Detailed Description of the Preferred Embodiment

[0014] 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.

[0015] In the present utility model, the front end refers to the burner end and the rear end refers to the condenser end.

[0016] The present utility model will be further explained in detail in conjunction with the drawings. The reference numerals in the drawings are: 1: flat burner; 2: furnace body; 3: upper header; 4: vacuum gauge; 5: high-temperature heat exchanger; 6: condenser; 7: smoke outlet; 8: heat exchange water pipe; 9: deaerator; 10: water pump; 11: steam heat exchanger; 12: steam collecting pipe; 13: pressure gauge; 14: liquid level gauge installation pipe; 15: steam outlet pipe; 16: safety valve; 17: lower header; 18: finned tube; 19: upper horizontal tube of the front heat exchange tube group; 20: upper horizontal tube of the rear heat exchange tube group; 21: lower horizontal tube of the front heat exchange tube group; 22: lower horizontal tube of the rear heat exchange tube group; 23: heat exchange tube; 24: upper cavity; 25: lower cavity; 26: outer shell; 27: heat exchange tube body.

[0017] As shown in the attached drawings, a flat combustion vacuum phase change steam generator includes a furnace body 1. A plurality of finned tubes 18 in the vertical direction are installed in the furnace body. The upper ends of the finned tubes are connected to the upper header 3, and the lower ends are connected to the lower header 17. A flat burner 1 is installed at the front end of the furnace body. A high-temperature heat exchanger 5 is fixedly connected behind the furnace body. Heat exchange tubes 23 are fixedly installed in the high-temperature heat exchanger 5. In this embodiment, the high-temperature heat exchanger includes two groups of heat exchange tube groups distributed front and back. Each group of heat exchange tube groups consists of a plurality of heat exchange tubes 23 distributed left and right. The upper ends of the heat exchange tubes 23 are connected to the upper horizontal tube, and the lower ends are connected to the lower horizontal tube. The lower horizontal tubes of the two groups of heat exchange tube groups are communicated with each other. In the figure, 19 indicates the upper horizontal tube of the front heat exchange tube group, and 20 indicates the upper horizontal tube of the rear heat exchange tube group; the lower horizontal tube 21 of the front heat exchange tube group is communicated with the lower horizontal tube 22 of the rear heat exchange tube group.

[0018] A condenser 6 is fixedly connected behind the high-temperature heat exchanger. A reciprocally bent heat exchange water pipe 8 is installed on the condenser. The water inlet of the steam generator is connected to one end of the heat exchange water pipe. The flue gas generated by the combustion of the flat burner sequentially passes through the furnace body, the high-temperature heat exchanger, and the condenser. A plurality of steam heat exchangers 11 are fixedly arranged outside the furnace body. In this embodiment, there are 5 steam heat exchangers. The steam heat exchanger 11 includes an upper cavity 24 and a lower cavity 25. The upper cavity and the lower cavity are connected through a plurality of heat exchange tube bodies 27. The upper cavity and the lower cavity are both hermetically and fixedly connected to the outer shell 26 surrounding the heat exchange tube bodies. The upper part of the outer shell 26 is connected to the upper header 3 through a pipeline, and the lower part is connected to the lower header 17 through a pipeline. The lower cavity 25 is connected to the outlet of the water pump 10. An deaerator 9 is arranged in front of the water pump (here, "front" does not refer to the front-back direction). The water pump 10 is connected to the outlet of the deaerator 9. The water inlet of the deaerator is connected to the outlet of the heat exchange water pipe 8 on the condenser 6. An automatic exhaust valve is installed on the deaerator. The deaerator has two functions. One is to make the water supply temperature of the water pump stable and avoid large fluctuations caused by the water pump directly pumping the water in the heat exchange water pipe. The other is to discharge the gas in the water.

[0019] The upper cavities of the 5 steam heat exchangers are all connected to the steam collecting pipe 12 through pipelines. A safety valve 16 is also installed on the steam collecting pipe. The steam collecting pipe 12 is connected to the upper horizontal tube 20 of the rear heat exchange tube group. The steam outlet pipe is connected to the upper horizontal tube 19 of the front heat exchange tube group. A vacuum gauge 4 is installed on the upper header. A pressure gauge 13 is installed on the steam collecting pipe. A liquid level gauge is installed on the steam heat exchanger. 14 indicates the liquid level gauge installation pipe.

[0020] The flue gas flow of this utility model is: furnace body, high-temperature heat exchanger, condenser, smoke outlet. The vacuum phase change heating process is: finned tube, upper header, inside the steam heat exchanger shell (outside the heat exchange tube), lower cavity, finned tube. The process from water inlet to steam is: heat exchange water pipe, deaerator, water pump, lower cavity, heat exchange tube body, upper cavity (steam), steam collector pipe, heat exchange tube group at the rear, heat exchange tube group at the front, steam outlet pipe.

[0021] In this steam generator, the steam formed by heat exchange inside the finned tube enters the shell of the steam heat exchanger through the upper header, exchanges heat with the hot water after heat exchange in the condenser to form steam and enters the upper cavity. The steam after heat exchange outside the heat exchange tube (inside the shell) undergoes phase change condensation and then flows into the lower header to enter the finned tube for circulation. The steam in the upper cavity enters the steam collector pipe, and then enters the high-temperature heat exchanger for further heat exchange and is output from the steam outlet pipe 15.

[0022] After the embodiments of the present utility model 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 utility model all belong to the scope of the technical solution of the present utility model, and the present utility model is not limited to the embodiments described in the specification either.

Claims

1. A flat-plate combustion vacuum phase-change steam generator, comprising a furnace body, wherein a plurality of vertical fin tubes are installed in the furnace body, wherein the upper ends of the fin tubes are connected to the upper header box, and the lower ends are connected to the lower header box, and a flat-plate burner is installed at the front end of the furnace body, characterized in that: A high-temperature heat exchanger is fixedly connected behind the furnace body, a heat exchange tube is fixedly installed in the high-temperature heat exchanger, a condenser is fixedly connected behind the high-temperature heat exchanger, a reciprocatingly bent hot water exchange tube is installed on the condenser, the water inlet of the steam generator is connected to one end of the hot water exchange tube, the flue gas generated by the flat burner passes through the furnace body, the high-temperature heat exchanger, and the condenser in sequence, and a plurality of steam heat exchangers are fixedly arranged outside the furnace body, the steam heat exchanger includes an upper cavity and a lower cavity, the upper cavity and the lower cavity are connected by a plurality of heat exchange tubes, and the upper cavity and the lower cavity are both sealed and fixedly connected On the outer shell surrounding the heat exchange tube body, the upper part of the outer shell is connected to the upper header through a pipeline, and the lower part is connected to the lower header through a pipeline. The lower cavity is connected to the water outlet of the water pump, and the water inlet of the water pump is directly or indirectly connected to the water outlet of the hot water exchange pipe on the condenser. The upper cavities of multiple steam heat exchangers are connected to the steam collecting pipe through a pipeline, the steam collecting pipe is connected to the inlet of the heat exchange tube on the high-temperature heat exchanger, and the steam outlet pipe is connected to the outlet of the heat exchange tube on the high-temperature heat exchanger. A vacuum gauge is installed on the upper header, a pressure gauge is installed on the steam collecting pipe, and a liquid level gauge is installed on the steam heat exchanger.

2. A flat-plate combustion vacuum phase-change steam generator according to claim 1, characterized in that: A deaerator is arranged in front of the water pump, the water pump is connected to the water outlet of the deaerator, the water inlet of the deaerator is connected to the water outlet of the hot water exchange pipe on the condenser, and an automatic exhaust valve is installed on the deaerator.

3. The flat-plate combustion vacuum phase-change steam generator according to claim 1, characterized in that: There are five steam heat exchangers.

4. The flat-plate combustion vacuum phase-change steam generator according to claim 1, characterized in that: A safety valve is also installed on the steam collecting pipe.

5. The flat-plate combustion vacuum phase-change steam generator according to claim 1, characterized in that: The high-temperature heat exchanger comprises two groups of heat exchange tube groups distributed front and back, each group of heat exchange tube groups is composed of a plurality of heat exchange tubes distributed left and right, the upper ends of the heat exchange tubes are connected to the upper transverse tubes, and the lower ends are connected to the lower transverse tubes, the lower transverse tubes of the two groups of heat exchange tube groups are connected, the steam collecting pipe is connected to the upper transverse tube of the rear heat exchange tube group, and the steam outlet pipe is connected to the upper transverse tube of the front heat exchange tube group.

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