Desuperheater system for small waste heat boiler

Abstract

The utility model relates to a desuperheater system for a small waste heat boiler, which comprises a deaerator, the deaerator is communicated with a coal economizer and a surface type desuperheater, the coal economizer is communicated with a boiler barrel, the boiler barrel is communicated with the surface type desuperheater, the boiler barrel is communicated with a superheater, the superheater is communicated with the surface type desuperheater, and the surface type desuperheater is communicated with the surface type desuperheater. The surface type desuperheater comprises a barrel and a heat exchange pipe installed in the barrel, the deaerator is communicated with the input end of the heat exchange pipe, the boiler barrel is communicated with the output end of the heat exchange pipe, the superheater is communicated with the barrel, the deaerator is communicated with the economizer through an economizer water inlet pipe, and the boiler barrel is communicated with the superheater through an economizer water outlet pipe. The deaerator is communicated with the surface type desuperheater through a desuperheater water inlet pipe, and regulating valves are arranged on the economizer water inlet pipe and the desuperheater water inlet pipe. Compared with a water spraying desuperheater, the surface type desuperheater is adopted, steam with higher quality can be provided, meanwhile, heat preservation heat is effectively recycled, and resource waste is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy saving in the boiler industry, in particular to the field of a desuperheater, and specifically refers to a desuperheater system for a small waste heat boiler. Background Art

[0002] For some waste heat boiler projects, because the produced steam needs to be used for power generation, and the calorific value of superheated steam is high, a superheater is usually installed on the boiler to further convert the produced saturated steam into superheated steam. However, due to the unstable flue gas flow rate at the boiler inlet or the high flue gas temperature, the produced superheated steam temperature is often high, so a desuperheater is installed to cool the superheated steam. The desuperheater is a device that uses water as a cooling medium to adjust the temperature of superheated reheated steam. Its function is to control and maintain the superheated steam temperature or reheated steam temperature at the specified value, and prevent the superheater and reheater tube walls from being heated.

[0003] The desuperheater usually adopts a water spray structure. The water spray desuperheater is a device that directly sprays atomized cooling water into the temperature-controlled water vapor, that is, allows the atomized cooling water to directly contact the superheated steam, so that it evaporates into water vapor and mixes well with the temperature-controlled water vapor to reduce the temperature of the temperature-controlled water vapor. The water spray desuperheater has the advantage of being easy to adjust. The water spray desuperheater is suitable for scenarios with large gas production, low steam quality requirements, or when qualified cooling water is already available.

[0004] For some waste heat boilers that require high-quality steam and have a small capacity, higher-quality cooling water must be provided when using a water spray desuperheater. Without high-quality cooling water, the quality of the steam will be greatly reduced. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a desuperheater system for a small waste heat boiler, which adopts a surface desuperheater. Compared with a water spray desuperheater, it can provide higher quality steam and effectively recover the insulation heat, thereby reducing resource waste.

[0006] The utility model is realized through the following technical scheme, and provides a desuperheater system for a small waste heat boiler, comprising a deaerator, wherein the deaerator is connected to an economizer and a surface desuperheater, wherein the economizer is connected to a boiler drum, wherein the boiler drum is connected to the surface desuperheater, wherein the boiler drum is connected to a superheater, and the superheater is connected to the surface desuperheater.

[0007] The utility model removes oxygen and other non-condensable gases in feed water by arranging a deaerator. A part of the deoxygenated water discharged from the deaerator enters the boiler drum through the economizer, and the other part enters the surface desuperheater as cooling water. The saturated steam in the boiler drum enters the superheater and exchanges heat with the flue gas to become superheated steam, and then enters the surface desuperheater. The superheated steam exchanges heat with the cooling water in the surface desuperheater and is then discharged. The deoxygenated water is reused as cooling water after the heat exchange is completed, thereby realizing the recycling of cooling water, having higher thermal efficiency, and not making the superheated steam directly contact with the cooling water, thereby also ensuring the quality of the output superheated steam.

[0008] As an optimization, the surface desuperheater includes a cylinder and a heat exchange tube installed in the cylinder, the deaerator is connected to the input end of the heat exchange tube, the drum is connected to the output end of the heat exchange tube, and the superheater is connected to the cylinder. The setting of this optimization scheme allows the deoxygenated water to flow in the heat exchange tube as cooling water, and the high-temperature steam to flow in the cylinder, thereby completing the heat exchange process.

[0009] As an optimization, the deaerator is connected to the economizer through the economizer water inlet pipe, and the deaerator is connected to the surface desuperheater through the desuperheater water inlet pipe, and the economizer water inlet pipe and the desuperheater water inlet pipe are both provided with regulating valves. The setting of this optimization scheme can control the flow of deoxygenated water entering the economizer and the desuperheater.

[0010] As an optimization, an inner sleeve is provided in the cylinder, and the heat exchange tube is installed in the inner sleeve. The configuration of this optimization scheme can reduce the contact area between cooling water and steam, thereby reducing heat loss during the heat exchange process, and helping to improve the thermal efficiency of the desuperheater.

[0011] As an optimization, the heat exchange tube adopts a U-shaped tube, and the heat exchange tube extends along the axial direction of the cylinder. The configuration of this optimization scheme can increase the contact area between cooling water and steam, thereby improving the thermal efficiency of the desuperheater.

[0012] As an optimization, an inspection hole is provided on the cylinder, and the inspection hole is located on the right side of the inner casing. The arrangement of this optimization scheme facilitates the endoscope inspection of the inner casing.

[0013] As an optimization, the left end of the inner sleeve is connected to the cylinder through a short section, and the cylinder is connected with a plurality of screws, which extend to the outer end surface of the inner sleeve. The setting of this optimization scheme can fix the inner sleeve, and the longer part on the right side of the inner sleeve is supported and limited by screws to prevent the inner sleeve from being deformed under long-term use.

[0014] The beneficial effects of the utility model are as follows: the deoxygenated water drawn from the deaerator is used as cooling water, circulated in the U-shaped tube, and the superheated steam drawn from the drum is cooled to reach the specified steam production temperature. The circulated cooling water is combined with the deoxygenated water from the economizer and enters the drum for the following heat exchange process. In this process, the used cooling water returns to the system to participate in heat exchange, realizing the recycling of cooling water, having a higher thermal efficiency, and without direct contact between the superheated steam and the cooling water, thus ensuring the quality of the output superheated steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the soda flow process of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the surface type desuperheater of the utility model;

[0017] As shown in the figure:

[0018] 1. Deaerator, 2. Deaerator outlet pipe, 3. Feed water pump, 4. Economizer inlet pipe, 5. Economizer, 6. Economizer outlet pipe, 7. Desuperheater inlet pipe, 8. Surface desuperheater, 81. Desuperheater outlet flange, 82. Short joint, 83. Cylinder, 84. Inner sleeve, 85. Heat exchange tube, 86. Screw, 87. Inspection hole, 88. Desuperheater inlet flange, 9. Desuperheater outlet pipe, 10. Boiler drum, 11. Saturated steam outlet pipe, 12. Superheater, 13. Superheated steam outlet pipe, 14. Desuperheater steam outlet pipe. DETAILED DESCRIPTION

[0019] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0020] like Figures 1-2 The utility model is shown as a desuperheater system for a small waste heat boiler, comprising a deaerator 1, wherein the deaerator 1 is connected to an economizer 5 and a surface desuperheater 8, wherein the deaerator 1 is connected to a deaerator water outlet pipe 2, wherein the deaerator water outlet pipe is connected to a feed water pump 3, wherein the water outlet of the feed water pump 8 is connected to an economizer water inlet pipe 4 and a surface desuperheater water inlet pipe 7, wherein the economizer water inlet pipe 4 is connected to the economizer 5, wherein the desuperheater water inlet pipe 7 is connected to the surface desuperheater 8, and the deoxygenated water generated by the deaerator 1 is diverted and transported to the economizer 5 and the surface desuperheater 8 through the feed water pump 3, wherein regulating valves are arranged on the economizer water inlet pipe 4 and the desuperheater water inlet pipe 7, and wherein the regulating valves can control the flow rate of the deoxygenated water entering the economizer 5 and the surface desuperheater 8.

[0021] The economizer 5 is connected to a boiler drum 10, which is connected to an economizer outlet pipe 6, which is connected to the boiler drum 10. The surface desuperheater 8 is connected to a desuperheater outlet pipe 9, which is connected to the economizer outlet pipe 6, so that the boiler drum 10 is connected to the surface desuperheater 8. The deoxygenated water entering the surface desuperheater 8 enters the economizer outlet pipe 6 through the desuperheater outlet pipe 9, merges with the deoxygenated water coming out of the economizer 5, and enters the boiler drum for heat exchange.

[0022] The boiler drum 10 is connected to an evaporator. The deoxygenated water in the boiler drum 10 generates saturated steam through the evaporator and returns to the boiler drum 10. The boiler drum 10 is connected to a superheater 12. The boiler drum 10 is connected to a saturated steam outlet pipe 11. The steam outlet pipe 11 is connected to the superheater 12, so that the boiler drum 10 is connected to the superheater 12. The superheater 12 is connected to an overheated steam outlet pipe 13. The superheated steam outlet pipe 13 is connected to a surface desuperheater 8, so that the superheater 12 is connected to the surface desuperheater 8. The surface desuperheater 8 is connected to a desuperheater steam outlet pipe 14. The saturated steam pipeline enters the superheater 12. The superheater 12 generates superheated steam. The superheated steam enters the surface desuperheater 8. The superheated steam exchanges heat with the deoxygenated water entering the surface desuperheater 8 in the surface desuperheater 8. The superheated steam after desuperheating is discharged through the desuperheater steam outlet pipe 14 for subsequent power generation and other purposes.

[0023] like Figure 2 As shown, the surface desuperheater 8 includes a cylinder 83 and a heat exchange tube 85 installed in the cylinder 83, the cylinder 83 extends in the left-right direction, an inner sleeve 84 is arranged in the cylinder, the inner sleeve 84 extends in the left-right direction, the heat exchange tube 85 is installed in the inner sleeve 84, the left and right ends of the inner sleeve 84 are open, the left end of the inner sleeve is connected to the cylinder 83 through a short section 82, the short section 82 is respectively fixed to the cylinder 83 and the inner sleeve 84, a plurality of screws 86 are connected to the cylinder, the screws are arranged in the right section of the cylinder 83, the screws extend to the outer end surface of the inner sleeve 84, an inspection hole 87 is opened on the cylinder, the inspection hole 87 extends in the front-back direction, a sealing cover for sealing the inspection hole 87 is installed on the inspection hole 87, and the inspection hole 87 is located on the right side of the inner sleeve.

[0024] The heat exchange tube 85 is a U-shaped tube, and the heat exchange tube 85 extends along the axial direction of the cylinder 83. The heat exchange tube includes a plurality of straight tubes extending in the left-right direction, and the plurality of straight tubes are arranged in the up-down direction. Adjacent straight tubes are connected by bends. The inner sleeve 84 is provided with through holes for the input end and the output end of the heat exchange tube 85 to pass through. The cylinder 83 is provided with a desuperheater water inlet, a desuperheater water outlet, a desuperheater steam inlet, and a desuperheater steam outlet. The input end of the heat exchange tube 85 passes through the inner sleeve 84 and extends to the desuperheater water inlet, and the output end of the heat exchange tube 85 passes through the inner sleeve 84 and extends to the desuperheater water outlet.

[0025] A desuperheater inlet flange 88 is installed at the desuperheater water inlet of the cylinder 83, and the cylinder 83 is connected to the desuperheater water inlet pipe 7 through the desuperheater inlet flange 88, so that the deaerator 1 is connected to the input end of the heat exchange tube 85, and a desuperheater outlet flange 81 is installed at the desuperheater water outlet of the cylinder 83, and the cylinder 83 is connected to the desuperheater water outlet pipe 9 through the desuperheater outlet flange 81, so that the boiler drum 10 is connected to the output end of the heat exchange tube 85, the desuperheater steam outlet of the cylinder is connected to the desuperheater steam outlet pipe, and the desuperheater steam inlet of the cylinder is connected to the superheated steam outlet pipe 13, so that the superheater 12 is connected to the cylinder 83.

[0026] During use of this embodiment, the deoxygenated water of the deaerator 1 is diverted by the water feed pump 3 to the economizer water inlet pipe 4 and the desuperheater water inlet pipe 7 through the deaerator water outlet pipe 2; the deoxygenated water in the economizer water inlet pipe 4 is discharged to the economizer water outlet pipe 6 through the economizer 5; the water in the desuperheater water inlet pipe 7 enters the heat exchange tube 85 of the surface desuperheater 8 as cooling water, and enters the desuperheater water outlet pipe 9 after heat exchange in the heat exchange tube 85; the cooling water in the desuperheater water outlet pipe 9 and the deoxygenated water in the economizer water outlet pipe 6 merge and are transported to the boiler drum 10.

[0027] The deoxygenated water in the boiler drum 10 is converted into saturated steam through the evaporator, and the saturated steam enters the superheater 12 through the saturated steam inlet and outlet pipes 11. The superheater 12 generates superheated steam, and the superheated steam enters the barrel 83 of the surface desuperheater 8 through the hot steam outlet pipe 13. The superheated steam flushes the heat exchange tube 85 in the inner sleeve 84, thereby completing the heat exchange process between the superheated steam and the cooling water. The superheated steam after cooling enters the desuperheater steam outlet pipe 14 through the desuperheater steam outlet, and the superheated steam is discharged to the subsequent pipeline through the desuperheater steam outlet pipe 14 for subsequent power generation and other purposes.

[0028] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved by or by adopting the existing technology, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not deviate from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A desuperheater system for a small waste heat boiler, characterized in that: The invention comprises a deaerator (1), wherein the deaerator (1) is connected to an economizer (5) and a surface desuperheater (8), wherein the economizer (5) is connected to a boiler drum (10), wherein the boiler drum (10) is connected to the surface desuperheater (8), wherein the boiler drum (10) is connected to a superheater (12), and wherein the superheater (12) is connected to the surface desuperheater (8).

2. A desuperheater system for a small waste heat boiler according to claim 1, characterized in that: The surface desuperheater (8) comprises a cylinder (83) and a heat exchange tube (85) installed in the cylinder (83); the deaerator (1) is connected to the input end of the heat exchange tube (85); the boiler drum (10) is connected to the output end of the heat exchange tube (85); and the superheater (12) is connected to the cylinder (83).

3. A desuperheater system for a small waste heat boiler according to claim 1, characterized in that: The deaerator is connected to the economizer (5) via an economizer water inlet pipe (4), and the deaerator is connected to the surface desuperheater (8) via a desuperheater water inlet pipe (7). Both the economizer water inlet pipe (4) and the desuperheater water inlet pipe (7) are provided with regulating valves.

4. A desuperheater system for a small waste heat boiler according to claim 2, characterized in that: An inner sleeve (84) is provided in the cylinder, and the heat exchange tube (85) is installed in the inner sleeve (84).

5. A desuperheater system for a small waste heat boiler according to claim 2, characterized in that: The heat exchange tube is a U-shaped tube, and the heat exchange tube (85) extends along the axial direction of the cylinder (83).

6. A desuperheater system for a small waste heat boiler according to claim 4, characterized in that: An inspection hole (87) is provided on the cylinder body, and the inspection hole (87) is located on the right side of the inner sleeve.

7. A desuperheater system for a small waste heat boiler according to claim 4, characterized in that: The left end of the inner sleeve is connected to the cylinder (83) via a short section (82), and a plurality of screws (86) are connected to the cylinder, and the screws extend to the outer end surface of the inner sleeve (84).

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