Horizontal once-through steam generating device

Abstract

The utility model relates to a horizontal once-through steam generating device which comprises a shell, a burner, a wall tubular heat exchanger, a first vaporization heat exchanger, a second vaporization heat exchanger, an overheating heat exchanger, a preheating heat exchanger and a smoke condensation heat exchanger. The smoke condensation heat exchanger, the preheating heat exchanger, the wall tube type heat exchanger, the first vaporization heat exchanger, the second vaporization heat exchanger and the overheating heat exchanger are sequentially communicated in series. Compared with an existing steam generating device with a steam-water separator, the steam generating device is a once-through steam generating device and is not provided with a tank body in the form of the steam-water separator, pipelines of the steam generating device are not connected and welded excessively, the production process is simple, the steam generating speed is high, high-temperature hot water does not stay in a heat exchanger, and the steam generating device is environment-friendly and energy-saving. All high-temperature hot water is directly heated into superheated steam and then is output.

Description

Technical Field

[0001] This utility model relates to the technical field of steam generating equipment, and in particular to a horizontal direct current steam generating device. Background Technology

[0002] Existing steam generators employ mixed-flow steam generation technology. Their structure is similar to a micro-superheated steam generator disclosed in Chinese Patent Publication No. CN220852115U on April 26, 2024. It includes a shell, a steam-water separator, a water inlet pipe, and a drain pipe. A burner is located at the front end of the shell, with an air inlet fan on the burner. A flue gas outlet is located at the rear end of the shell. Inside the shell, from front to back, are arranged a wall-tube heat exchanger, a vaporization heat exchanger, a steam-water separator, a superheated heat exchanger, and a high-temperature flue gas heat exchanger. The superheated heat exchanger has a steam outlet. The water inlet pipe, high-temperature flue gas heat exchanger, wall-tube heat exchanger, vaporization heat exchanger, steam-water separator, and superheated heat exchanger are connected in series. In this invention, cold water sequentially passes through a high-temperature flue gas heat exchanger, a wall-tube heat exchanger, and a vaporization heat exchanger to become high-temperature steam. Then, water is separated by a steam-water separator. The steam then enters a superheated heat exchanger for further heat exchange, becoming superheated steam. However, the above steam generating device has the following shortcomings: 1. The steam-water separator has numerous welded joints, resulting in a high risk of leakage and complex welding processes. 2. After separation in the steam-water separator, some of the high-temperature steam condenses into high-temperature hot water and remains inside the separator, leading to a slow steam output rate and low steam output. 3. The heat from the flame and flue gas generated by the burner is transferred to the outer casing, causing severe thermal damage. Therefore, the structure of the existing steam generating equipment needs further improvement. Utility Model Content

[0003] The purpose of this utility model is to provide a horizontal direct current steam generator with simple production process, good leak prevention and fast steam generation speed.

[0004] The purpose of this utility model is achieved as follows:

[0005] A horizontal direct-flow steam generator includes a shell, a burner, a wall-tube heat exchanger, a first vaporization heat exchanger, a second vaporization heat exchanger, a superheater heat exchanger, a preheater heat exchanger, and a flue gas condenser heat exchanger. The inner wall of the shell is provided with insulation material. The burner is located at the front end of the shell and is equipped with an air inlet fan that is connected to the burner. The wall-tube heat exchanger, the first vaporization heat exchanger, the second vaporization heat exchanger, the superheater heat exchanger, the preheater heat exchanger, and the flue gas condenser heat exchanger are arranged sequentially inside the shell along the flow direction of the flue gas. The flue gas condenser heat exchanger is provided with a water inlet. The rear end of the shell is provided with a flue gas outlet. The superheater heat exchanger is provided with a steam outlet. The flue gas condenser heat exchanger, the preheater heat exchanger, the wall-tube heat exchanger, the first vaporization heat exchanger, the second vaporization heat exchanger, and the superheater heat exchanger are connected in series. This invention is a direct-flow steam generator without a tank containing a steam-water separator. In this invention, cold water sequentially passes through a flue gas condenser heat exchanger, a preheating heat exchanger, a wall-tube heat exchanger, a first vaporization heat exchanger, a second vaporization heat exchanger, and a superheating heat exchanger, exchanging heat with high-temperature flue gas to become superheated steam. This invention eliminates the retention of high-temperature hot water within the heat exchangers; all high-temperature hot water is directly heated into superheated steam before being output. Compared to existing steam generators with steam-water separators, this invention has fewer pipe connections and welds. The manufacturing process is simple, leak-proof, and produces steam quickly. The insulation material in this invention prevents heat loss from the high-temperature flue gas, thereby reducing the temperature of the outer shell and improving the thermal energy utilization rate.

[0006] The present invention can be further improved in the following ways.

[0007] The first vaporization heat exchanger and the second vaporization heat exchanger are connected by flanges, and the second vaporization heat exchanger and the superheat heat exchanger are also connected by flanges. Therefore, the pipeline of this invention has few joints and welds and has good leak-proof performance.

[0008] The wall-tube heat exchanger, the first vaporization heat exchanger, the second vaporization heat exchanger, the superheat heat exchanger, and the preheat heat exchanger are all welded to the outer shell.

[0009] The outer casing is elongated and horizontally mounted on the base, facilitating the horizontal flow of high-temperature flue gas.

[0010] This utility model also includes a base, with the outer shell horizontally disposed on the base.

[0011] The flue gas condenser heat exchanger is located at the flue gas outlet, which faces downwards.

[0012] The outer shell includes a long shell and a spliced ​​shell. The spliced ​​shell is detachably connected to the rear end of the long shell. The flue gas condensing heat exchanger is located inside the spliced ​​shell, and the exhaust port is located at the lower end of the spliced ​​shell. The spliced ​​shell of this invention is detachable. Therefore, this invention can increase or decrease the number of heat exchange tube layers of the flue gas condensing heat exchanger according to the flue gas condensing effect, so as to improve the cooling effect of the flue gas. After assembly, it is reinstalled on the long shell.

[0013] The flue gas condensing heat exchanger is composed of multiple layers of snake-shaped heat exchange tubes stacked one on top of the other. The multiple layers of snake-shaped heat exchange tubes are connected in series. Multiple heat exchange fins are provided on the outer wall of the heat exchange tubes. The adjacent heat exchange fins are spaced apart to form a flue gas passage gap.

[0014] The flue gas condensing heat exchanger is equipped with an inlet water connection flange and an outlet water connection flange. The water inlet is located on the inlet water connection flange, and a water pipe is provided between the preheating heat exchanger and the outlet water connection flange.

[0015] The first vaporization heat exchanger is a convective heat exchange tube, while the second vaporization heat exchanger and the superheat heat exchanger are spiral finned heat exchange tubes.

[0016] The preheating heat exchanger is composed of multiple vertically arranged straight pipes connected in series. The ends of two adjacent straight pipes are connected by bends, and there is a flue gas passage gap between two adjacent straight pipes.

[0017] A wall-tube heat exchanger is composed of at least one heat exchange tube spirally wound in a horizontal direction to form a cylindrical structure. The front and rear of the wall-tube heat exchanger are open. The burner extends into the wall-tube heat exchanger from the front and the rear of the wall-tube heat exchanger faces the first vaporization heat exchanger.

[0018] The insulation material is insulation cotton.

[0019] The beneficial effects of this utility model are as follows:

[0020] (1) This utility model is a direct-flow steam generator without a tank in the form of a steam-water separator. The cold water of this utility model passes through a flue gas condenser heat exchanger, a preheating heat exchanger, a wall tube heat exchanger, a first vaporization heat exchanger, a second vaporization heat exchanger, and a superheating heat exchanger in sequence to exchange heat with the high-temperature flue gas and become superheated steam. In this utility model, there is no high-temperature hot water remaining in the heat exchanger. All the high-temperature hot water is directly heated into superheated steam and then output. Compared with the existing steam generator with a steam-water separator, the pipeline of this utility model does not have too many joints and welds. The production process of this utility model is simple, the leak-proof performance is good, and the steam generation speed is fast.

[0021] (2) In this invention, the cold water sequentially passes through a flue gas condenser heat exchanger, a preheating heat exchanger, a wall-tube heat exchanger, a first vaporization heat exchanger, a second vaporization heat exchanger, and a superheating heat exchanger to exchange heat with high-temperature flue gas, becoming superheated steam. The superheated steam produced by this invention still has high steam quality after long-distance transportation. This invention solves the problem of heat loss and energy reduction in saturated steam after long-distance transportation, and the problem of some steam condensing into droplets, leading to a deterioration in steam quality.

[0022] (3) The heat insulation material of this utility model blocks the heat of the high temperature flue gas from dissipating outward, thereby reducing the temperature of the outer shell and improving the thermal energy utilization rate of this utility model.

[0023] (4) The superheated steam produced by this utility model has a higher temperature and higher heat, and the available latent heat of steam is higher, resulting in higher thermal efficiency and significant energy-saving effect.

[0024] (5) When the superheated steam of this utility model is used as a power heat source for driving equipment, it will not produce condensate that could damage the driving equipment;

[0025] (6) The superheated steam of this utility model has good safety. There is no oxygen present during superheated steam drying, and there is no oxidation or combustion reaction. It can eliminate bacteria and other toxic microorganisms in the drying of food raw materials and pharmaceutical raw materials.

[0026] (7) The superheated steam of this utility model can be used for degreasing of mechanical oil, sterilization, washing and drying, and coating of waste plastic before recycling and utilization. Attached Figure Description

[0027] Figure 1 This is a side perspective view of the horizontal direct current steam generator of this utility model.

[0028] Figure 1 The solid arrows indicate the direction of water and water vapor flow, while the dashed arrows indicate the direction of high-temperature flue gas flow.

[0029] Figure 2 This is a top view of the flue gas condenser heat exchanger of this utility model. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] Example 1, as Figure 1 and Figure 2As shown, a horizontal direct-flow steam generator includes a shell 3, a burner 2, a wall-tube heat exchanger 4, a first vaporization heat exchanger 5, a second vaporization heat exchanger 6, a superheater heat exchanger 7, a preheater heat exchanger 8, and a flue gas condensation heat exchanger 9. The inner wall of the shell 3 is provided with insulation material 17. The burner 2 is located at the front end of the shell, and an air inlet fan 20 is mounted on the burner 2, communicating with it. The wall-tube heat exchanger 4, the first vaporization heat exchanger 5, and the second vaporization heat exchanger 6... The second vaporization heat exchanger 6, superheater heat exchanger 7, preheater heat exchanger 8, and flue gas condenser heat exchanger 9 are sequentially arranged inside the outer shell 3 along the flue gas flow direction. The flue gas condenser heat exchanger 9 has a water inlet 11, and the rear end of the outer shell 3 has a flue gas outlet 13. The superheater heat exchanger 7 has a steam outlet 12. The flue gas condenser heat exchanger 9, preheater heat exchanger 8, wall-tube heat exchanger 4, first vaporization heat exchanger 5, second vaporization heat exchanger 6, and superheater heat exchanger 7 are connected in series. In this invention, the cold water sequentially passes through the flue gas condenser heat exchanger, preheater heat exchanger, wall-tube heat exchanger, first vaporization heat exchanger 5, second vaporization heat exchanger 6, and superheater heat exchanger to exchange heat with the high-temperature flue gas, becoming superheated steam. The superheated steam produced by this invention retains high steam quality even after long-distance transportation. This invention solves the problem of heat loss and energy reduction in saturated steam during long-distance transportation, leading to a deterioration in steam quality due to partial condensation into droplets.

[0032] This is a more specific technical solution of the present invention.

[0033] The first vaporization heat exchanger and the second vaporization heat exchanger are connected by a flange, and the second vaporization heat exchanger and the superheat heat exchanger are connected by a flange.

[0034] The wall-tube heat exchanger 4, the first vaporization heat exchanger 5, the second vaporization heat exchanger 6, the superheated heat exchanger 7, and the preheated heat exchanger 8 are all welded to the outer shell.

[0035] This utility model also includes a base 1, and an outer shell 3 is elongated and horizontally disposed on the base 1.

[0036] The flue gas condenser heat exchanger 9 is located at the flue gas outlet 13, which faces downwards.

[0037] The flue gas condenser heat exchanger 9 is composed of multiple layers of snake-shaped heat exchange tubes 91 stacked on top of each other. The multiple layers of snake-shaped heat exchange tubes 91 are connected in series. Multiple heat exchange fins 92 are provided on the outer wall of the heat exchange tubes. The adjacent heat exchange fins 92 are spaced apart to form a flue gas passage gap 93.

[0038] The outer shell 3 includes a long shell 14 and a spliced ​​shell 15. The flue gas condensing heat exchanger 9 is located inside the spliced ​​shell 15, and the exhaust port 13 is located at the lower end of the spliced ​​shell.

[0039] The flue gas condensing heat exchanger 9 is equipped with an inlet flange 18 and an outlet flange 19. The inlet 11 is located on the inlet flange 18. A water pipe 21 is provided between the preheating heat exchanger 8 and the outlet flange 19. Water in the flue gas condensing heat exchanger 9 flows into the preheating heat exchanger 8 through the water pipe.

[0040] The first vaporization heat exchanger is a convective heat exchange tube, while the second vaporization heat exchanger and the superheat heat exchanger are spiral finned heat exchange tubes.

[0041] The preheating heat exchanger 8 is composed of multiple vertically arranged straight pipes connected in series. The ends of two adjacent straight pipes are connected by a bend, and there is a flue gas passage gap between two adjacent straight pipes.

[0042] The wall-tube heat exchanger 4 is composed of at least one heat exchange tube spirally wound in a horizontal direction to form a cylindrical structure. The front and rear of the wall-tube heat exchanger 4 are open. The burner extends into the wall-tube heat exchanger 4 from the front and the rear of the wall-tube heat exchanger 4 faces the first vaporization heat exchanger.

[0043] The insulation material is insulation cotton.

[0044] The working principle of this utility model is as follows:

[0045] The working principle of this utility model is as follows: The air intake fan of this utility model drives the air outside the outer casing 3 into the burner 2, supplying oxygen to the burner 2. The burner 2 starts to ignite and burn, heating the wall-tube heat exchanger 4. The combustion of the burner 2 produces high-temperature flue gas, which flows sequentially through the first vaporization heat exchanger 5, the second vaporization heat exchanger 6, the superheating heat exchanger 7, the preheating heat exchanger 8, and the flue gas condensing heat exchanger 9. At the same time, water enters the flue gas condensing heat exchanger 9 from the water inlet and flows sequentially into the flue gas condensing heat exchanger 9, the preheating heat exchanger 8, and the wall-tube heat exchanger. The system consists of a first vaporization heat exchanger 5, a second vaporization heat exchanger 6, and a superheating heat exchanger 7. After the high-temperature flue gas absorbs heat from front to back through each heat exchanger, its temperature gradually decreases, and it is finally discharged through the exhaust port. Water is preheated in the flue gas condensation heat exchanger 9 and the preheating heat exchanger 8 to become high-temperature water. Then, the high-temperature water is heated into steam in the wall-tube heat exchanger, the first vaporization heat exchanger 5, and the second vaporization heat exchanger 6. The steam then enters the superheating heat exchanger 7 to be heated into superheated steam. Finally, the superheated steam is discharged from the steam outlet, thus ensuring the quality of the output steam.

Claims

1. A horizontal once-through steam generator, comprising a shell, a burner, a wall-tube heat exchanger, a first vaporization heat exchanger, a second vaporization heat exchanger, a superheater heat exchanger, a preheater heat exchanger, and a flue gas condensation heat exchanger, wherein the burner is located at the front end of the shell, and an air inlet fan is provided on the burner, the air inlet fan being connected to the burner, characterized in that, The inner wall of the shell is insulated with heat-insulating material. The wall-tube heat exchanger, the first vaporization heat exchanger, the second vaporization heat exchanger, the superheater heat exchanger, the preheater heat exchanger, and the flue gas condenser heat exchanger are arranged sequentially inside the shell along the flow direction of the flue gas. The flue gas condenser heat exchanger is provided with a water inlet. The rear end of the shell is provided with a flue gas outlet. The superheater heat exchanger is provided with a steam outlet. The flue gas condenser heat exchanger, the preheater heat exchanger, the wall-tube heat exchanger, the first vaporization heat exchanger, the second vaporization heat exchanger, and the superheater heat exchanger are connected in series.

2. The horizontal direct-flow steam generator according to claim 1, characterized in that, The first vaporization heat exchanger and the second vaporization heat exchanger are connected by a flange, and the second vaporization heat exchanger and the superheat heat exchanger are connected by a flange.

3. The horizontal direct-flow steam generator according to claim 1, characterized in that, The wall-tube heat exchanger, the first vaporization heat exchanger, the second vaporization heat exchanger, the superheat heat exchanger, and the preheat heat exchanger are all welded to the outer shell.

4. The horizontal direct-flow steam generator according to claim 1, characterized in that, It also includes a base, and the outer shell is elongated and horizontally mounted on the base.

5. The horizontal direct-flow steam generator according to claim 1, characterized in that, The flue gas condenser heat exchanger is located at the flue gas outlet, which faces downwards.

6. The horizontal direct-flow steam generator according to claim 1, characterized in that the outer shell... It includes a long shell and a spliced ​​shell. The spliced ​​shell is detachably connected to the rear end of the long shell. The flue gas condensing heat exchanger is located inside the spliced ​​shell, and the flue gas outlet is located at the lower end of the spliced ​​shell.

7. The horizontal direct-flow steam generator according to claim 6, characterized in that, The flue gas condensing heat exchanger is composed of multiple layers of snake-shaped heat exchange tubes stacked one on top of the other. The multiple layers of snake-shaped heat exchange tubes are connected in series. Multiple heat exchange fins are provided on the outer wall of the heat exchange tubes. The adjacent heat exchange fins are spaced apart to form a flue gas passage gap.

8. The horizontal direct-flow steam generator according to claim 7, characterized in that, The flue gas condensing heat exchanger is equipped with an inlet water connection flange and an outlet water connection flange. The water inlet is located on the inlet water connection flange, and a water pipe is provided between the preheating heat exchanger and the outlet water connection flange.

9. The horizontal direct-flow steam generator according to claim 1, characterized in that, The first vaporization heat exchanger is a convective heat exchange tube, while the second vaporization heat exchanger and the superheat heat exchanger are spiral finned heat exchange tubes.

10. The horizontal direct-flow steam generator according to claim 1, characterized in that, The preheating heat exchanger is composed of multiple vertically arranged straight tubes connected in series. The ends of two adjacent straight tubes are connected by bends, and there is a flue gas clearance between two adjacent straight tubes. The wall-tube heat exchanger is composed of at least one heat exchange tube spirally wound into a cylindrical structure in the horizontal direction. The front and rear of the wall-tube heat exchanger are open. The burner extends into the wall-tube heat exchanger from the front, and the rear of the wall-tube heat exchanger faces the first vaporization heat exchanger.

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