Steam quantity control device for thermal power generation

Abstract

The utility model discloses a steam quantity control device for thermal power generation, which relates to the technical field of thermal power generation and comprises a steam pocket, a water pan is arranged on the inner top side of the steam pocket, a drain pipe is arranged on the lower side of the water pan, and an overflow bucket is arranged in the center of the lower side of the drain pipe. Through the arrangement of the inner pipe, the impeller, the gas equalizing pipe, the corrugated plate separator, the overflow bucket, the drain pipe and the water receiving disc, saturated steam is subjected to gas-liquid separation through the corrugated plate separator before entering the saturated steam pipe, the separated steam enters the inner side through a round hole of the gas equalizing pipe, and the steam can push the impeller to rotate, so that the saturated steam is separated from the water outlet pipe. Further, the inner pipe rapidly rotates around the gas equalizing pipe, so that liquid attached to the impeller can be thrown out of the gas equalizing pipe under the action of rotating centrifugal force and finally drips onto the corrugated plate separator, the amount of salt-containing water entering the superheater is reduced, and then water scale formed on the inner side wall of the superheater is reduced; the reheating efficiency of the superheater on the saturated steam is guaranteed, and meanwhile the conveying amount of the saturated steam is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal power generation, in particular to a steam quantity control device for thermal power generation. Background Art

[0002] Thermal power generation is a power generation method that uses the heat energy generated by combustibles during combustion and converts it into electrical energy through a power generation device. In the process of thermal power generation, the steam drum is the connecting hub of the three processes of boiler heating, vaporization, and superheating, and plays a connecting role. Water in the boiler must go through three processes of heating, vaporization, and superheating to become qualified superheated steam. The heating process is to heat the feed water into saturated water; the vaporization process is to vaporize saturated water into saturated steam; and the superheating process is to heat saturated steam into superheated steam. The above three processes are completed by the economizer, the evaporation heating surface, and the superheater respectively. The steam drum is related to the above three processes. It must receive water from the economizer; it forms a circulation loop with the evaporation heating surface; and the saturated steam must be distributed from the steam drum to the superheater. The steam drum is both the intersection of the three processes of heating, vaporization, and superheating, and the dividing point of the three processes of heating, vaporization, and superheating. The steam drum plays an important role in regulating the amount of saturated steam.

[0003] When the existing steam control device is in use, the end of the saturated steam pipe on the steam drum lacks a gas equalization structure, so that the saturated steam will quickly enter the saturated steam pipe, and the gas-liquid separation effect of the saturated steam cannot be guaranteed, thereby causing more salt-containing water and saturated steam to enter the superheater. After the salt-containing water evaporates, it is easy to form a scale layer, which in turn affects the reheating efficiency of the superheater for the saturated steam and the saturated steam delivery rate. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide a steam quantity control device for thermal power generation. By arranging an inner tube, an impeller, an air equalizing pipe, a corrugated plate separator, an overflow bucket and a water receiving tray, before the saturated steam enters the saturated steam pipe, the saturated steam passes through the corrugated plate separator for gas-liquid separation, and the separated steam enters the inner side through the circular hole of the air equalizing pipe. The steam can drive the impeller to rotate, thereby causing the inner tube to rotate rapidly around the air equalizing pipe, thereby causing the liquid attached to the impeller to be thrown out of the air equalizing pipe under the action of the rotating centrifugal force, and finally drip onto the corrugated plate separator, thereby reducing the amount of salt-containing water entering the superheater, thereby reducing the scale formed on the inner wall of the superheater, ensuring the reheating efficiency of the superheater for the saturated steam, and at the same time ensuring the delivery amount of the saturated steam, which can effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a steam quantity control device for thermal power generation, comprising a steam drum, a water receiving tray is arranged on the top side of the steam drum, a drain pipe is arranged on the lower side of the water receiving tray, an overflow bucket is arranged at the center of the lower side of the drain pipe, a saturated steam pipe is arranged on the upper part of the outer side of the steam drum, an air equalizing pipe is arranged on the lower end of the saturated steam pipe, an inner pipe is connected to the inner bottom side of the air equalizing pipe through a bearing, an impeller is arranged on the inner bottom side of the inner pipe, a corrugated plate separator is arranged on the upper side of the water receiving tray, the corrugated plate separator can separate water and steam through the adhesion of the plate to liquid water, and the corrugated plate separator is arranged obliquely, the corrugated plate separator is low on one side facing the water receiving tray and high on the other side, so that liquid can flow into the water receiving tray and finally converge into the overflow bucket.

[0006] Furthermore, an inner lining plate is provided on the inner bottom side of the steam drum, and a cyclone separator is symmetrically provided on the inner bottom side of the inner lining plate. A water vapor inlet pipe is provided on the cyclone separator close to one side of the inner lining plate. The water vapor mixture enters the cyclone separator through the water vapor inlet pipe. The cyclone separator can separate the water vapor mixture into gas and liquid, so that liquid water flows back from the cyclone separator into the steam drum.

[0007] Furthermore, a fixed bracket is arranged between the inner lining plate and the steam drum, a dosing pipe is arranged on the lower side of the cyclone separator, and a grille is arranged at intervals on the inner bottom side of the inner lining plate. The grille can allow the water inside the steam drum to transport cold water to the connecting pipe under the action of heat transfer. The dosing pipe can spray diluted trisodium phosphate into the steam drum through an external pressurized spraying device, so that the calcium and magnesium salts in the water in the steam drum generate non-adhesive loose water slag, and can also play a role in correcting the alkalinity of the boiler water, so that the pH value of the boiler water is maintained within the range specified by the regulations.

[0008] Furthermore, economizer water pipes are symmetrically arranged on the lower side of the steam drum, a water-cooled wall water pipe is arranged on one side of the economizer water pipe, and a water supply inner pipe is transversely arranged on the upper end of the economizer water pipe. The economizer can preheat the incoming water, and the heated water is transported to the steam drum through the economizer water pipe. The water-cooled wall water pipe can transport water from the heating water tank outside the combustion furnace into the steam drum.

[0009] Furthermore, a maintenance cover is provided at one end of the outside of the steam drum, an observation window is provided on the maintenance cover, and a connecting pipe is provided at the center of the lower side of the steam drum. The maintenance cover can be opened conveniently by maintenance personnel to enter the steam drum for maintenance, and the observation window can be opened conveniently by management personnel to observe the situation inside the steam drum.

[0010] Furthermore, a blocking plate is vertically arranged in the cavity formed by the corrugated plate separator and the top side of the steam drum, and the blocking plate is welded to the steam drum. The corrugated plate separator and the steam drum are connected to each other by bolts. The blocking plate can separate the cavity between the upper side of the corrugated plate separator and the steam drum into single spaces, and each separated space is connected to a saturated steam pipe, so that the saturated steam transported by each saturated steam pipe meets the demand.

[0011] Furthermore, the fixing bracket is welded to the inner side surface of the steam drum, and the fixing bracket is connected to the inner lining plate by bolts. The fixing bracket can fix and support the inner lining plate to ensure the stability and strength of the inner lining plate.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The utility model provides an inner tube, an impeller, an air equalizing tube, a corrugated plate separator, an overflow bucket, a drain pipe and a water receiving tray, so that before the saturated steam enters the saturated steam tube, the saturated steam passes through the corrugated plate separator for gas-liquid separation, and the separated steam enters the inner side through the circular hole of the air equalizing tube. The steam can drive the impeller to rotate, thereby causing the inner tube to rotate rapidly around the air equalizing tube, so that the liquid attached to the impeller can be thrown out of the air equalizing tube under the action of the rotating centrifugal force, and finally drip onto the corrugated plate separator, thereby reducing the amount of salt-containing water entering the superheater, thereby reducing the scale formed on the inner wall of the superheater, ensuring the reheating efficiency of the superheater for the saturated steam, and at the same time ensuring the delivery amount of the saturated steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the main cross-sectional structure of the steam drum in the utility model;

[0016] Figure 3 It is a schematic diagram of the three-dimensional structure of the water receiving tray and the corrugated plate separator in the utility model;

[0017] Figure 4 It is a schematic diagram of the three-dimensional structure of the air pipe in the utility model;

[0018] Figure 5 It is a schematic diagram of the top view of the structure of the air pipe and the inner pipe in the utility model.

[0019] In the figure: 1. Steam drum; 2. Maintenance cover; 3. Observation window; 4. Saturated steam pipe; 5. Interconnecting pipe; 6. Economizer water pipe; 7. Water-cooled wall water pipe; 8. Cyclone separator; 9. Inner lining plate; 10. Corrugated plate separator; 11. Fixed bracket; 12. Inner water feed pipe; 13. Drain pipe; 14. Water receiving tray; 15. Air equalizing pipe; 16. Blocking plate; 17. Water vapor inlet pipe; 18. Grille; 19. Overflow bucket; 20. Inner pipe; 21. Impeller; 22. Dosing pipe. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-5 The present embodiment provides a technical solution: a steam quantity control device for thermal power generation, comprising a steam drum 1, a water receiving tray 14 is arranged on the top side of the steam drum 1, a drain pipe 13 is arranged on the lower side of the water receiving tray 14, an overflow bucket 19 is arranged at the lower center of the drain pipe 13, a saturated steam pipe 4 is arranged on the upper part of the outer surface of the steam drum 1, an air equalizing pipe 15 is arranged on the lower end of the saturated steam pipe 4, an inner pipe 20 is connected to the inner bottom side of the air equalizing pipe 15 through a bearing, an impeller 21 is arranged on the inner bottom side of the inner pipe 20, and a corrugated plate separator 10 is arranged on the upper side of the water receiving tray 14.

[0022] like Figure 1-Figure 5 As shown, the corrugated plate separator 10 separates the water vapor from the water vapor mixture, and the separated water flows along the corrugated plate separator 10 into the water receiving tray 14. The water on the water receiving tray 14 can be transported to the overflow bucket 19 through the drain pipe 13. The steam after water vapor separation enters the inner side of the inner tube 20 through the air equalizing pipe 15, thereby driving the impeller 21 to rotate. The water droplets attached to the impeller 21 can be thrown out from the inner tube 20 and the air equalizing pipe 15 under the action of centrifugal force, and finally drip onto the corrugated plate separator 10.

[0023] An inner lining plate 9 is arranged on the inner bottom side of the steam drum 1 , a cyclone separator 8 is symmetrically arranged on the inner bottom side of the inner lining plate 9 , and a water vapor inlet pipe 17 is arranged on one side of the cyclone separator 8 close to the inner lining plate 9 .

[0024] like Figure 1-Figure 2 As shown, the cyclone separator 8 sucks the water vapor mixture through the water vapor inlet pipe 17. The water vapor mixture is separated into steam and water under the action of centrifugal force to ensure that the water content of the steam meets the requirements. The inner lining plate 9 can separate the water inside the steam drum 1 from the water input by the water-cooled wall water pipe 7 to ensure the stability of the water surface inside the steam drum 1.

[0025] A fixed bracket 11 is arranged between the inner lining plate 9 and the steam drum 1 , a dosing pipe 22 is arranged at the lower side of the cyclone separator 8 , and a grille 18 is arranged at intervals on the inner bottom side of the inner lining plate 9 .

[0026] like Figure 1-Figure 2 As shown, the fixing bracket 11 can support and fix the inner lining plate 9 to ensure the stability of the inner lining plate 9, and the grille 18 can allow the low-temperature water inside the steam drum 1 to flow downward into the connecting pipe 5 under the action of heat transfer, and then flow back into the wall-type heating furnace.

[0027] Economizer water pipes 6 are symmetrically arranged on the lower side of the steam drum 1, a water-cooled wall water pipe 7 is arranged on one side of the economizer water pipe 6, and a feed water inner pipe 12 is transversely arranged on the upper end of the economizer water pipe 6.

[0028] like Figure 1-Figure 2 As shown, the pipe connected to the economizer water pipe 6 is connected to the economizer, which can heat the water in the pipe. The feed water inner pipe 12 can evenly feed the feed water to the bottom side of the steam drum 1, thereby making the high-temperature water flow upward and the low-temperature water flow downward.

[0029] A maintenance cover plate 2 is provided at one end of the outside of the steam drum 1 , an observation window 3 is provided on the maintenance cover plate 2 , and a connecting pipe 5 is provided at the center of the lower side surface of the steam drum 1 .

[0030] like Figure 1-Figure 2 As shown, when maintenance is needed, the maintenance cover 2 can be opened, thereby facilitating maintenance personnel to enter the inside of the steam drum 1 to perform maintenance operations.

[0031] A plugging plate 16 is vertically arranged in the cavity formed by the corrugated plate separator 10 and the top side of the steam drum 1. The plugging plate 16 is welded to the steam drum 1, and the corrugated plate separator 10 and the steam drum 1 are connected by bolts.

[0032] The fixing bracket 11 is welded to the inner side surface of the steam drum 1, and the fixing bracket 11 is connected to the inner lining plate 9 by bolts.

[0033] The working principle of the steam quantity control device for thermal power generation provided by the utility model is as follows: Figure 1-Figure 5As shown, the economizer water pipe 6 and the water-cooled wall water pipe 7 can supply water to the inner side of the drum 1, the outer side of the drum 1 contacts the inner side of the combustion furnace, the water vapor mixture between the lining plate 9 and the drum 1 can be sucked in by the cyclone separator 8, and then the water vapor mixture is subjected to water vapor separation treatment, the steam after water vapor separation is again subjected to water vapor separation by the corrugated plate separator 10, the steam after separation flows upward, passes through the upper corrugated plate separator 10 for water vapor separation, the separated water flows into the water receiving tray 14, and finally flows into the steam collecting tray 14 through the drain pipe 13 The steam finally enters the overflow bucket 19 through the air equalizing pipe 15 and enters the inner side of the inner pipe 20, which can drive the impeller 21 to rotate. The rotating impeller 21 can rotate and throw out the water attached to the impeller 21, so that the water is thrown out from the inner pipe 20 and the air equalizing pipe 15 and drips onto the corrugated plate separator 10 on the lower side. The dosing pipe 22 can spray trisodium phosphate to make the calcium and magnesium salts in the water in the steam drum 1 generate non-adhesive loose water slag, and it can also correct the alkalinity of the boiler water, so that the pH value of the boiler water is maintained within the range specified by the regulations.

[0034] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A steam quantity control device for thermal power generation, comprising a steam drum (1), characterized in that: A water receiving tray (14) is arranged on the top side of the steam drum (1), a drain pipe (13) is arranged on the lower side of the water receiving tray (14), an overflow bucket (19) is arranged at the center of the lower side of the drain pipe (13), a saturated steam pipe (4) is arranged on the upper side of the outer side of the steam drum (1), an air equalizing pipe (15) is arranged at the lower end of the saturated steam pipe (4), an inner tube (20) is connected to the inner bottom side of the air equalizing pipe (15) via a bearing, an impeller (21) is arranged on the inner bottom side of the inner tube (20), and a corrugated plate separator (10) is arranged on the upper side of the water receiving tray (14).

2. The steam quantity control device for thermal power generation according to claim 1, characterized in that: An inner lining plate (9) is arranged on the inner bottom side of the steam drum (1), a cyclone separator (8) is symmetrically arranged on the inner bottom side of the inner lining plate (9), and a water vapor inlet pipe (17) is arranged on a side of the cyclone separator (8) close to the inner lining plate (9).

3. The steam quantity control device for thermal power generation according to claim 2, characterized in that: A fixed bracket (11) is arranged between the inner lining plate (9) and the steam drum (1), a dosing pipe (22) is arranged at the lower side of the cyclone separator (8), and a grille (18) is arranged at intervals on the inner bottom side of the inner lining plate (9).

4. The steam quantity control device for thermal power generation according to claim 1, characterized in that: The lower side of the steam drum (1) is symmetrically provided with an economizer water pipe (6), one side of the economizer water pipe (6) is provided with a water-cooled wall water pipe (7), and the upper end of the economizer water pipe (6) is laterally provided with a feed water inner pipe (12).

5. The steam quantity control device for thermal power generation according to claim 1, characterized in that: A maintenance cover plate (2) is provided at one end of the outside of the steam drum (1), an observation window (3) is provided on the maintenance cover plate (2), and a connecting pipe (5) is provided at the center of the lower side surface of the steam drum (1).

6. The steam quantity control device for thermal power generation according to claim 1, characterized in that: A blocking plate (16) is vertically arranged in a cavity formed by the corrugated plate separator (10) and the top side of the steam drum (1); the blocking plate (16) is welded to the steam drum (1); and the corrugated plate separator (10) and the steam drum (1) are connected by bolts.

7. The steam quantity control device for thermal power generation according to claim 3, characterized in that: The fixing bracket (11) is welded to the inner side surface of the steam drum (1), and the fixing bracket (11) is connected to the inner lining plate (9) by bolts.

Images