An improved steam generating device

Abstract

The present invention relates to an improved steam generating device, which includes a casing and a flow stabilizer. Inside the casing, a preheating heat exchanger, a vaporizing heat exchanger, and a burner are sequentially arranged from top to bottom. The preheating heat exchanger and the vaporizing heat exchanger are connected in series. A steam outlet is provided on the vaporizing heat exchanger. The vaporizing heat exchanger includes at least two spiral coil heat exchangers arranged side by side. A shunt pipe is provided at the outlet of the preheating heat exchanger. The shunt pipe connects the outlet of the preheating heat exchanger and the inlet of the spiral coil heat exchanger. The outlet of the spiral coil heat exchanger is connected to the steam outlet. In the present invention, the vaporizing heat exchanger adopts at least two spiral coil heat exchangers, and the water flow is divided into two or more paths for flowing and heat exchange, so as to achieve parallel pipe shunt, greatly reduce the pipe resistance of the heat exchange pipes, effectively reduce the load and power consumption of the water pump, also reduce the flow rates of water and steam, reduce the steam generation speed, and enable the steam to be more fully heat exchanged, and the unsaturated steam will be heated into saturated steam.

Description

Technical Field

[0001] The present invention relates to the technical field of steam generators, and particularly to an improved steam generating device. Background Art

[0002] The existing heat exchange device of the once-through steam generator adopts once-through steam generation technology. Multiple heat exchangers are arranged in the once-through steam generator heat exchange device from top to bottom. The first heat exchanger is a copper heat exchanger, the second heat exchanger is a copper heat exchanger, and the third heat exchanger is a stainless steel serpentine tube heat exchanger. The serpentine tube heat exchanger consists of multiple straight tubes, and elbows are welded at the ends of the straight tubes to form a serpentine tube. Tap water enters the multiple heat exchangers, and the tap water exchanges heat countercurrently from top to bottom. The flue gas is discharged from the top from bottom to top. The heat exchange efficiency is high, and the steam formation speed is fast.

[0003] Although the existing steam generator device has high heat exchange efficiency and fast steam formation speed, it also has the following disadvantages: (1) The pipe resistance of the existing heat exchanger is large, the water pump load is high, and the power consumption is high; (2) Moreover, although the steam formation speed of the existing once-through steam generator heat exchange device is fast, the steam quality cannot be effectively guaranteed; (3) In addition, the welding workload of the elbows of the serpentine tube heat exchanger is large, the efficiency is low, and there is a risk of water leakage; (4) The pipe gap of the stainless steel serpentine tube heat exchanger is large, resulting in a limited number of heat exchange tubes of the serpentine tube heat exchanger, a small heat exchange area of the serpentine tube heat exchanger, and the inability to more effectively reduce the flue gas temperature, resulting in a high temperature and fast temperature rise of the copper heat exchanger. However, the heat resistance strength of the copper heat exchanger is insufficient. Therefore, the copper heat exchanger is prone to deformation and damage under high temperature, high pressure and abnormal conditions. Therefore, the structure of the existing improved steam generating device needs to be further improved. Summary of the Invention

[0004] The invention purpose of the present invention is to provide an improved steam generating device with small pipe resistance, low water pump load and good steam quality.

[0005] The invention purpose of the present invention is realized as follows:

[0006] An improved steam generating device includes a casing and a flow stabilizer. A preheating heat exchanger, a vaporizing heat exchanger and a burner are sequentially arranged in the casing from top to bottom. The preheating heat exchanger and the vaporizing heat exchanger are connected in series and communicated. The preheating heat exchanger is provided with a water inlet, and the vaporizing heat exchanger is provided with a steam outlet. The vaporizing heat exchanger includes at least two coil heat exchangers. A shunt pipe is arranged at the outlet of the preheating heat exchanger. The shunt pipe connects the outlet of the preheating heat exchanger and the inlet of the coil heat exchanger. The outlet of the coil heat exchanger is communicated with the steam outlet.

[0007] The present invention can also be further improved as follows.

[0008] The upper end of the shunt pipe is connected to the outlet of the preheating heat exchanger. At least two shunt ports are provided at the lower end of the shunt pipe, and the shunt ports are respectively communicated with the inlets of the corresponding coil heat exchangers.

[0009] At least two layers of the vaporization heat exchangers are provided in the machine shell from top to bottom. Each layer of the vaporization heat exchanger includes at least two of the coil heat exchangers. The coil heat exchanger is a spiral coil heat exchanger. The spiral coil heat exchangers of the upper and lower adjacent layers of the vaporization heat exchangers are connected in series. The steam outlet is provided on the topmost layer of the vaporization heat exchanger, and the inlet of the spiral coil heat exchanger of the bottommost layer of the vaporization heat exchanger is communicated with the shunt pipe.

[0010] The spiral coil heat exchangers of the same layer of the vaporization heat exchanger are arranged side by side.

[0011] The vaporization heat exchanger includes two of the coil heat exchangers. The coil heat exchanger is a spiral coil heat exchanger. Two shunt ports are provided at the lower end of the shunt pipe. The lower end of the shunt pipe is located between the inlets of the two spiral coil heat exchangers. The two shunt ports are respectively communicated with the inlets of the two spiral coil heat exchangers. Of course, the coil heat exchanger of the present invention may also be a serpentine coil heat exchanger.

[0012] The inlet of the topmost layer of the vaporization heat exchanger is communicated with the flow stabilizer, and the outlet of the second topmost layer of the vaporization heat exchanger is communicated with the flow stabilizer. After the steam of the second topmost layer of the vaporization heat exchanger enters the flow stabilizer, water-vapor separation is realized. The high-temperature small droplets are condensed in the flow stabilizer, and the condensed water after condensation enters the preheating heat exchanger of the present invention again through the water inlet pipe, while the steam enters the topmost layer of the vaporization heat exchanger to be heated and vaporized again, thereby effectively ensuring the dryness of the steam.

[0013] The spiral coil heat exchanger is formed by spirally winding a steel pipe along the lead direction of the spiral coil heat exchanger into multiple turns of heat exchange coils. The steel pipe is preferably a stainless steel pipe.

[0014] One end of the steel pipe is the inlet, and the other end of the steel pipe is the outlet. A steam output pipe is provided on the topmost layer of the vaporization heat exchanger. The steam outlet is provided on the steam output pipe. The outlet of the spiral coil heat exchanger of the topmost layer of the vaporization heat exchanger is connected to the steam output pipe.

[0015] The length direction of the heat exchange coil is perpendicular to the lead direction of the spiral coil heat exchanger.

[0016] There is a smoke passing gap between two adjacent turns of the heat exchange coils on the same spiral coil heat exchanger. The flue gas will rise from the smoke passing gap of the lower spiral coil heat exchanger, and the upper spiral coil heat exchanger will immediately continue to exchange heat with the high-temperature flue gas, thereby improving the heat exchange efficiency.

[0017] The range of the smoke passage gap between two adjacent heat exchange coils on the same spiral coil heat exchanger is 1 mm - 10 mm. Therefore, the present invention can increase the number of turns of the heat exchange coils as much as possible within a limited space, thereby increasing the heat exchange area and improving the heat exchange efficiency.

[0018] The spiral coil heat exchanger is in a long shape, the heat exchange coil is in a runway shape, and the length direction of the heat exchange coil is the same as the length direction of the spiral coil heat exchanger.

[0019] The heat exchange coils of the upper and lower adjacent vaporization heat exchangers are arranged in a staggered manner. The flue gas will rise through the smoke passage gap of the lower spiral coil heat exchanger, and the upper spiral coil heat exchanger will immediately continue to exchange heat with the high-temperature flue gas, thereby improving the heat exchange efficiency.

[0020] The inlet and outlet of the spiral coil heat exchanger are located on the same side of the spiral coil heat exchanger, which is convenient for connecting pipelines.

[0021] The beneficial effects of the present invention are as follows:

[0022] (1) The vaporization heat exchanger of the present invention adopts at least two spiral coil heat exchangers, and the water flow is divided into two or more paths for heat exchange, thereby realizing parallel pipe and split flow, greatly reducing the pipe resistance of the heat exchange pipes, effectively reducing the load and power consumption of the water pump, and also reducing the flow rates of water and steam, reducing the generation speed of steam, enabling the steam to conduct heat exchange more fully, and the unsaturated steam will be heated into saturated steam, with good steam quality. The present invention improves the product performance and meets the requirement of stably outputting high-temperature and high-pressure dry saturated steam.

[0023] (2) Moreover, the vaporization heat exchanger of the present invention adopts a spiral coil heat exchanger, and the pipe gap of the spiral coil heat exchanger can be controlled at about 2 mm, which can increase the number of turns of the heat exchange coils as much as possible within a limited space, thereby increasing the heat exchange area, effectively reducing the flue gas temperature, controlling the flue gas temperature flowing upward through the preheating heat exchanger (copper heat exchanger), and greatly reducing the risk of deformation and damage of the preheating heat exchanger.

[0024] (3) In addition, the spiral coil heat exchanger of the present invention is integrally bent and formed, with high processing efficiency, no welded elbows, which can effectively reduce the risk of water leakage and improve the production efficiency at the same time.

[0025] (4) Even more, after adding a flow stabilizer in the present invention, the steam in the first-layer vaporization heat exchanger enters the flow stabilizer to realize water-vapor separation. The high-temperature small liquid droplets condense in the flow stabilizer, while the steam enters the second-layer vaporization heat exchanger and is heated and vaporized again, thereby effectively ensuring the dryness of the steam. Description of the Drawings

[0026] Figure 1It is a schematic structural diagram of the first embodiment (omitting the front side plate and part of the right side plate) of the improved steam generating device of the present invention.

[0027] Figure 2 It is Figure 1 the front view.

[0028] Figure 3 It is Figure 1 the right view.

[0029] Figure 4 It is Figure 1 the left view.

[0030] Figure 5 It is a schematic structural diagram of the first-layer vaporization heat exchanger of the first embodiment of the present invention.

[0031] Figure 6 It is a schematic structural diagram of the second-layer vaporization heat exchanger of the first embodiment of the present invention.

[0032] Figure 7 It is a schematic structural diagram of the second embodiment (omitting the front side plate and part of the right side plate) of the improved steam generating device of the present invention.

[0033] Figures 2 to 4 The arrows in it indicate the flow direction of cold water or steam. Specific embodiments

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] Embodiment 1, as Figures 1 to 6As shown in the figure, an improved steam generating device includes a casing 1, a water inlet pipe (not shown in the figure), and a flow stabilizer 10. The casing 1 is formed by enclosing a top plate 16, a front side plate, a rear side plate 18, a left side plate 19, and a right side plate 191 in the upper, front, rear, left, and right orientations respectively. Two exhaust fans 11 are provided at the top of the casing 1. Inside the casing 1, a first-layer preheating heat exchanger 2, a second-layer preheating heat exchanger 3, a first-layer vaporization heat exchanger 4, a second-layer vaporization heat exchanger 5, and two burner rows 6 are arranged in sequence from top to bottom. The preheating heat exchanger 20 and the vaporization heat exchanger 40 are connected in series. The first-layer preheating heat exchanger 2 is provided with a water inlet 14, and the first-layer vaporization heat exchanger 4 is provided with a steam output pipe 15. A steam outlet 47 is provided on the steam output pipe 15. The first-layer vaporization heat exchanger 4 and the second-layer vaporization heat exchanger 5 are connected in series. The first-layer vaporization heat exchanger 4 includes two first spiral coil heat exchangers 41 and 42 arranged adjacent to each other on the left and right. The two first spiral coil heat exchangers 41 and 42 are arranged side by side and are symmetric in structure from left to right. The second-layer vaporization heat exchanger 5 includes two second spiral coil heat exchangers 51 and 52 arranged adjacent to each other on the left and right. The two second spiral coil heat exchangers 51 and 52 are arranged side by side and are symmetric in structure from left to right. Of course, the two first spiral coil heat exchangers and the two second spiral coil heat exchangers of the present invention can also be serpentine coil heat exchangers.

[0036] The two first spiral coil heat exchangers 41 and 42 can be designed to be connected, and the two second spiral coil heat exchangers 51 and 52 can be designed to be connected, so as to facilitate the quick installation by workers.

[0037] A shunt pipe 13 is provided at the outlet of the second-layer preheating heat exchanger 3. The upper end of the shunt pipe 13 is connected to the outlet of the second-layer preheating heat exchanger 3. The lower end of the shunt pipe 13 is provided with two shunt ports 55 and 56 corresponding to the two second spiral coil heat exchangers 51 and 52. The lower end of the shunt pipe 13 is located between the inlets of the two second spiral coil heat exchangers 51 and 52. The two shunt ports 55 and 56 are respectively communicated with the inlets of the two second spiral coil heat exchangers 51 and 52. The outlets of the two second spiral coil heat exchangers 51 and 52 are communicated with the flow stabilizer 10. The inlets of the two first spiral coil heat exchangers are communicated with the flow stabilizer 10. The outlets of the two first spiral coil heat exchangers 41 and 42 are communicated with the steam outlet 47. Of course, according to the requirements of different steam output and steam generation speed of the steam generating device of the present invention, the number of vaporization heat exchangers, the number of spiral coil heat exchangers in each layer of the vaporization heat exchanger, and the number of shunt ports of the shunt pipe 13 can be increased or decreased.

[0038] As a more specific technical solution of the present invention.

[0039] The number of turns of the heat exchange coils 43 of the two second spiral coil heat exchangers 51 and 52 is the same, and the number of turns of the heat exchange coils 43 of the two first spiral coil heat exchangers 41 and 42 is the same.

[0040] The first spiral coil heat exchanger and the second spiral coil heat exchanger are both formed by spirally winding a steel pipe into multiple turns of heat exchange coils 43 along the lead direction of the spiral coil heat exchanger.

[0041] One end of the steel pipe is the inlet, and the other end of the steel pipe is the outlet. The outlets of the two second spiral coil heat exchangers are connected to the steam output pipe.

[0042] The length direction of the heat exchange coil 43 is perpendicular to the lead direction of the spiral coil heat exchanger.

[0043] The gap between two adjacent turns of the heat exchange coils 43 on the same spiral coil heat exchanger ranges from 1 mm to 10 mm, preferably 2 mm.

[0044] The spiral coil heat exchanger is in a long shape, and the heat exchange coil 43 is in a runway shape. The length direction of the heat exchange coil 43 is the same as the length direction of the spiral coil heat exchanger.

[0045] The heat exchange coils 43 of the upper and lower adjacent two vaporization heat exchangers are arranged in a staggered manner.

[0046] The inlets and outlets of the two first spiral coil heat exchangers and the inlets and outlets of the two second spiral coil heat exchangers are located on the same side of the spiral coil heat exchanger.

[0047] As a more detailed technical solution of the present invention.

[0048] First flanges 53 and second flanges 54 are respectively provided at the inlets of the two second spiral coil heat exchangers 51 and 52. The first flanges 53 and the second flanges 54 are arranged oppositely. The two shunt ports 55 and 56 at the lower end of the shunt pipe 13 are respectively connected to the first flanges 53 and the second flanges 54.

[0049] Third flanges 43 and fourth flanges 44 are respectively provided at the outlets of the two first spiral coil heat exchangers 41 and 42. A fifth flange 48 is provided on the steam outlet 47. The third flanges 43 and the fourth flanges 44 are respectively connected to the two flanges on the flow stabilizer.

[0050] The working principle of the present invention is:

[0051] When the present invention works, cold water enters the first-layer preheating heat exchanger 2, the second-layer preheating heat exchanger 3, the first-layer vaporizing heat exchanger 4 and the second-layer vaporizing heat exchanger 5 in sequence through the water inlet 14 and the water inlet pipe. At the same time, the burner 6 ignites, and the burner 6 starts to bake the first-layer vaporizing heat exchanger 4, the second-layer vaporizing heat exchanger 5, the first-layer preheating heat exchanger 2 and the second-layer preheating heat exchanger 3. The flame of the burner 6 mainly bakes the first-layer vaporizing heat exchanger 4 and the second-layer vaporizing heat exchanger 5, and the residual heat of the flame of the burner 6 can preheat the cold water entering the first-layer preheating heat exchanger 2 and the second-layer preheating heat exchanger 3 first, so that the cold water is quickly heated to become high-temperature water. Then, after the water is shunted through the shunt pipe 13, it enters the two second spiral coil heat exchangers 51 and 52 of the second-layer vaporizing heat exchanger 5. When the water enters the spiral coil heat exchanger of the second-layer vaporizing heat exchanger 5, it has already started to boil and vaporize into water vapor. Then, the high-temperature water vapor in the two second spiral coil heat exchangers 51 and 52 respectively flows to the flow stabilizer 10 to realize water-vapor separation. The high-temperature small liquid droplets are condensed in the flow stabilizer 10, and the condensed water after condensation re-enters the first-layer preheating heat exchanger 20 of the present invention through the water inlet pipe, while the high-temperature dry steam respectively enters the two first spiral coil heat exchangers 41 and 42 of the first-layer vaporizing heat exchanger 4 to be heated and vaporized again, so as to effectively ensure the dryness of the steam. After that, the high-temperature steam is discharged from the steam outlet 47 to be supplied to the steam heating equipment. The two-layer vaporizing heat exchanger of the present invention adopts a spiral coil heat exchanger, and the pipe gap of the spiral coil heat exchanger can be controlled at about 2 mm, which can increase the number of turns of the heat exchange coil 43 as much as possible in a limited space, thereby increasing the heat exchange area, effectively reducing the flue gas temperature, controlling the flue gas temperature entering the preheating heat exchanger (copper heat exchanger), and greatly reducing the risk of deformation and damage of the preheating heat exchanger 20.

[0052] Embodiment 2, as Figure 7 shown, the implementation manner of Embodiment 2 is similar to that of the embodiment. The only difference is that: in the casing 1, a first-layer preheating heat exchanger 2, a second-layer preheating heat exchanger 3, a first-layer vaporizing heat exchanger 4, a second-layer vaporizing heat exchanger 5 and three burners 6 are arranged in sequence from top to bottom. Two support partition plates 7 are vertically spaced in the casing 1. The two support partition plates 7 divide the inner cavity of the casing into a first combustion chamber 61, a second combustion chamber 62 and a third combustion chamber 63 from left to right. Three exhaust fans 11 are provided at the top of the casing corresponding to the first combustion chamber 61, the second combustion chamber 62 and the third combustion chamber 63. The first-layer preheating heat exchanger 2, the second-layer preheating heat exchanger 3, the first-layer vaporizing heat exchanger 4 and the second-layer vaporizing heat exchanger 5 are horizontally arranged in the first combustion chamber 61, the second combustion chamber 62 and the third combustion chamber 63 and are located on the two support partition plates 7. The three burners 6 are respectively arranged at the bottoms of the first combustion chamber 61, the second combustion chamber 62 and the third combustion chamber 63.

Claims

1. An improved steam generating device, comprising a casing, wherein a preheating heat exchanger, a vaporization heat exchanger and a burner are sequentially arranged in the casing from top to bottom, the preheating heat exchanger and the vaporization heat exchanger are connected in series and communicated, a water inlet is arranged on the preheating heat exchanger, and a steam outlet is arranged on the vaporization heat exchanger, and the characteristics are that, The vaporizing heat exchanger includes at least two coil heat exchangers. A shunt pipe is provided at the outlet of the preheating heat exchanger. The shunt pipe connects the outlet of the preheating heat exchanger and the inlet of the coil heat exchanger. The outlet of the coil heat exchanger is communicated with the steam outlet; At least two layers of the vaporizing heat exchangers are provided in the casing from top to bottom. Each layer of the vaporizing heat exchanger includes at least two of the coil heat exchangers. The coil heat exchanger is a spiral coil heat exchanger. The spiral coil heat exchangers of the upper and lower adjacent layers of the vaporizing heat exchangers are connected in series. The steam outlet is provided on the topmost vaporizing heat exchanger. The inlet of the spiral coil heat exchanger of the bottommost vaporizing heat exchanger is communicated with the shunt pipe; The upper end of the shunt pipe is connected to the outlet of the preheating heat exchanger. The vaporizing heat exchanger includes two of the coil heat exchangers. Two shunt ports are provided at the lower end of the shunt pipe. The lower end of the shunt pipe is located between the inlets of the two spiral coil heat exchangers. The two shunt ports are respectively communicated with the inlets of the two spiral coil heat exchangers; It further includes a flow stabilizer. The inlet of the topmost vaporizing heat exchanger is communicated with the flow stabilizer. The outlet of the second topmost vaporizing heat exchanger is communicated with the flow stabilizer; The spiral coil heat exchanger is formed by spirally winding a steel pipe along the lead direction of the spiral coil heat exchanger into multiple turns of heat exchange coils. The length direction of the heat exchange coils is perpendicular to the lead direction of the spiral coil heat exchanger.

2. The improved steam generating device according to claim 1, characterized in that, The spiral coil heat exchangers of the same layer of the vaporizing heat exchanger are arranged side by side.

3. The improved steam generating device according to claim 1, wherein The range of the smoke passing gap between two adjacent turns of the heat exchange coils on the same spiral coil heat exchanger is 1 mm - 10 mm.

4. The improved steam generating device according to claim 1, characterized in that, The spiral coil heat exchanger is in a long shape. The heat exchange coils are in a runway shape. The length direction of the heat exchange coils is the same as the length direction of the spiral coil heat exchanger.

5. The improved steam generating device according to claim 1, characterized in that, One end of the steel pipe is the inlet, and the other end of the steel pipe is the outlet. A steam output pipe is provided on the topmost vaporizing heat exchanger. The steam outlet is provided on the steam output pipe. The outlet of the spiral coil heat exchanger of the topmost vaporizing heat exchanger is connected to the steam output pipe.

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