CN214581006U - Drainage device for boiler air heater of thermal power plant - Google Patents
Drainage device for boiler air heater of thermal power plant Download PDFInfo
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- CN214581006U CN214581006U CN202120535052.4U CN202120535052U CN214581006U CN 214581006 U CN214581006 U CN 214581006U CN 202120535052 U CN202120535052 U CN 202120535052U CN 214581006 U CN214581006 U CN 214581006U
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Abstract
The utility model discloses a drainage device of a boiler air heater of a thermal power plant, which comprises a steam turbine exhaust system, a first fixed-row flash tank, a primary air heater, an air supply air heater, a drain door and a deaerator, wherein the main pipelines of the steam turbine exhaust system and the first fixed-row flash tank are respectively connected with the primary air heater and the air supply air heater through pipelines, the primary air heater and the air supply air heater are respectively connected with the deaerator through pipelines, the drain door is arranged on the pipeline between the outlet of the primary air heater and the deaerator, the drain door is arranged on the pipeline between the outlet of the air supply air heater and the deaerator, the system is characterized by further comprising a bypass and a second fixed-row flash tank, wherein an outlet of the primary air heater is connected with one end of the bypass, an outlet of the air supply heater is connected with the other end of the bypass, and the bypass is connected with the second fixed-row flash tank through a pipeline.
Description
Technical Field
The utility model relates to a thermal power factory technical field, concretely relates to boiler fan heater hydrophobic means of steam power plant can the universal application in the electricity generation trade that has boiler fan heater hydrophobic system.
Background
At present, two common drainage modes of a boiler air heater at home and abroad are generally adopted, one mode is a mode that the drainage of the air heater is led to a deaerator, namely, the drainage in a drainage box of the air heater is drained to the deaerator through a drainage pump of the air heater; the other is a mode that the drainage of the air heater is led to a steam exhaust device, namely the air flows to a low-pressure heater or a condenser through an automatic steam trap and pressure difference drainage automatically. When the boiler is overhauled and the water quality is unqualified at the initial starting stage of the unit, the heater is drained and discharged outwards through the arranged bypass.
In a common thermal power generating set (fig. 2), each boiler is provided with 1 primary air heater and 1 air supply air heater, and the primary air heaters and the air supply air heaters are arranged in a vertical air duct which is 10 meters away from the ground, and a heating medium is auxiliary steam, namely steam turbine exhaust steam. The auxiliary steam releases all latent heat of vaporization after being cooled in the air heater, and the air is completely condensed into water after being heated and automatically flows to the deaerator through pressure difference drainage. The air heater is generally designed to have a drainage pressure of 1.2 MPa; the rated working pressure (gage pressure) of the deaerator is 0.488MPa, the pressure head is 0.4335MPa (the central elevation of a drain pipe of the air heater is 43.35m), and the water side resistance is 0.09 MPa.
The to-be-solved technical problem of the utility model is:
firstly, when the boiler is overhauled and the water quality at the initial starting stage of the unit is unqualified: because no bypass is arranged, the drained water of the air heater cannot be discharged outside;
secondly, when the drainage system of the air heater is not provided with a drainage tank or an automatic drainage device: the phenomenon that when the unit operates under variable working conditions, a gas-liquid two-phase flow is formed in the pipeline, so that the pipeline and connected equipment vibrate violently, drainage of the air heater cannot be recycled normally, and therefore heat loss and water supplement rate are increased;
and thirdly, the problems that the drain pipeline of the air heater is long, the potential energy is high, the on-way resistance is large, the drainage is not smooth easily, and the water hammer, vibration and leakage are caused by the drainage remained in the air heater are avoided.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model provides a steam power plant boiler fan heater hydrophobic means to solve the above-mentioned problem among the prior art.
In order to achieve the above object, the present invention provides the following technical solutions:
according to the first aspect of the utility model, a steam turbine exhaust system, a first fixed-row flash tank, a primary air heater, an air supply heater, a drain door and a deaerator are provided, wherein the main pipeline of the steam turbine exhaust system and the first fixed-row flash tank is respectively connected with the primary air heater and the air supply heater through pipelines, the primary air heater and the air supply heater are respectively connected with the deaerator through pipelines, the drain door is provided on the pipeline between the outlet of the primary air heater and the deaerator, the drain door is provided on the pipeline between the outlet of the air supply heater and the deaerator, the steam turbine exhaust system is characterized in that a bypass and a second fixed-row flash tank are further provided, the outlet of the primary air heater is connected with one end of the bypass, the outlet of the air supply heater is connected with the other end of the bypass, the bypass is connected with the second fixed-row flash tank through a pipeline, and when the boiler maintenance and the initial-stage unit starting water quality are unqualified, the primary air heater and the air supply heater are drained to the second fixed-row flash tank.
And further, the water-saving device also comprises a heat supply network heater, wherein the heat supply network heater is arranged on a trunk pipeline between the two water drain doors and the deaerator.
Further, the device also comprises a heat supply network drain box, wherein the heat supply network drain box is arranged on a pipeline between the heat supply network heater and the deaerator.
Further, the heat supply network drain box is communicated with the deaerator through at least one pipeline.
Further, still include the heat supply network drainage pump, the heat supply network drainage case with all the pipelines between the oxygen-eliminating device are equallyd divide and are respectively provided with the heat supply network drainage pump.
Furthermore, the automatic steam trap is further included, the pipeline between the primary air heater and the heat supply network heater is provided with the automatic steam trap, and the pipeline between the air supply heater and the heat supply network heater is provided with the automatic steam trap.
Furthermore, the automatic steam trap is arranged beside the water drain door in series.
Furthermore, through the added automatic steam trap, the heat supply network heater is utilized, after the water quality is qualified, the primary air fan heater and the drainage of the air supply fan heater automatically flow to the heat supply network heater through the automatic steam trap and the pressure difference drainage to heat the heat supply network heater for supplying water, and the drainage of the heat supply network heater passes through the heat supply network drainage box and the heat supply network drainage pump to be discharged to the deaerator.
Further, the heating network heater is positioned at the first station of the heating network at 6-7 meters, and the size of the standby port is DN 400.
Further, the second fixed bank flash tank is located at an intermediate position of the bypass.
The utility model has the advantages of as follows: through the drainage device of the boiler air heater of the thermal power plant, when the water quality is unqualified in the initial stages of boiler maintenance and unit starting, the drainage of the air heater is drained to the fixed-row flash tank, so that scaling and pipe explosion inside a steam-water pipeline are effectively prevented; an automatic steam trap is additionally arranged, and after a heat supply network heater is utilized, vibration of a steam trap pipeline is reduced, so that the steam trap of the air heater is normally recycled; the air heater can drain water smoothly and operate stably, and the low-temperature corrosion and ash blockage of the air preheater are effectively prevented; after the application of the efficient utilization method of the boiler air heater drainage, the drainage is normally recycled. The obvious effects on safe production and energy conservation and consumption reduction can be obtained; in the aspect of economic benefit, the heat value of the recovered water can reach 130.89 ten thousand yuan per year, and the cost of saving the soft water can reach 25.2 ten thousand yuan per year.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.
Fig. 1 is a block diagram of a drainage device of a steam heater of a thermal power plant according to some embodiments of the present invention.
Fig. 2 is a structural diagram of a drainage device of a steam air heater of a thermal power plant provided in the prior art.
In the figure: 1. steam turbine exhaust system, 2, first flash tank surely arrange, 3, first wind air heater, 4, air supply air heater, 5, the discharge gate, 6, the oxygen-eliminating device, 7, the bypass, 8, the flash tank is arranged surely to the second, 9, automatic steam trap, 10, heat supply network heater, 11, heat supply network drain box, 12, heat supply network drain pump, 13, air door.
Detailed Description
The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, the utility model provides a steam power plant boiler air heater drainage device in the first aspect embodiment, including steam turbine exhaust system 1, first definite row flash tank 2, primary air heater 3, air supply heater 4, water drain door 5 and oxygen-eliminating device 6, the main pipeline of steam turbine exhaust system 1 and first definite row flash tank 2 is connected with primary air heater 3 and air supply heater 4 through the pipeline respectively, primary air heater 3 and air supply heater 4 are connected with oxygen-eliminating device 6 through the pipeline respectively, water drain door 5 is provided on the pipeline between the export of primary air heater 3 and oxygen-eliminating device 6, water drain door 5 is provided on the pipeline between the export of air supply heater 4 and oxygen-eliminating device 6, its characteristic is that, still include bypass 7 and second definite row flash tank 8, the export of primary air heater 3 is connected with one end of bypass 7, the export of air supply heater 4 is connected with the other end of bypass 7, bypass 7 passes through the pipeline and is connected with the flash tank 8 is surely arranged to the second, when boiler maintenance and unit start initial stage quality of water are unqualified, arranges flash tank 8 is surely arranged to the second with the drainage of wind heater 3 of giving first time and air supply heater 4.
In the above embodiment, it should be noted that the first fixed-row flash tank 2 and the second fixed-row flash tank 8 are fixed-row flash tanks having the same structure, the second fixed-row flash tank 8 is located 0 (ground height) meter outside the boiler plant, the size of the spare port is DN200, and as shown in fig. 2, the air door 13 is not provided.
The economic benefit calculation formula of each boiler is as follows: water repellency: 36000t in 10t/h multiplied by 24h multiplied by 150 days; heat quantity: 4.3kJ/KG. ℃x 36000000KG × 187.9 ℃ ═ 29086.92 GJ; heat value: 29086.92GJ × 45 yuan/GJ 130.89 ten thousand yuan; cost of soft water: 36000t multiplied by 7 yuan/t is 25.2 ten thousand yuan.
The technical effects achieved by the above embodiment are as follows: according to the drainage device for the boiler air heater of the thermal power plant, when the water quality is unqualified in the initial stages of boiler maintenance and unit starting, drainage of the air heater is drained to the fixed-discharge flash tank, and scaling and pipe explosion in a steam-water pipeline are effectively prevented; the air heater can drain water smoothly and operate stably, and the low-temperature corrosion and ash blockage of the air preheater are effectively prevented; after the application of the efficient utilization method of the boiler air heater drainage, the drainage is normally recycled. The obvious effects on safe production and energy conservation and consumption reduction can be achieved; in the aspect of economic benefit, the heat value of the recovered water can reach 130.89 ten thousand yuan per year, and the cost of saving the soft water can reach 25.2 ten thousand yuan per year.
Optionally, as shown in fig. 1, in some embodiments, a heat supply network heater 10 is further included, and the heat supply network heater 10 is disposed on the trunk pipe between the two water discharge doors 4 and the deaerator 6.
Optionally, as shown in fig. 1, in some embodiments, a heat-net drain tank 11 is further included, and the heat-net drain tank 11 is disposed on the pipeline between the heat-net heater 10 and the deaerator 6.
Alternatively, as shown in FIG. 1, in some embodiments, the heat net trap 11 is in communication with the deaerator 6 via at least one conduit.
Optionally, as shown in fig. 1, in some embodiments, a heat-network drain pump 12 is further included, and the heat-network drain pumps 12 are respectively disposed on all the pipelines between the heat-network drain tank 11 and the deaerator 6.
In the above optional embodiment, it should be noted that the heat supply network heater 10, the heat supply network drain tank 11, and the deaerator 6 are sequentially arranged in series, and a branch of the heat supply network drain tank 11 connected to the deaerator 6 is provided with the heat supply network drain pump 12.
The beneficial effects of the above alternative embodiment are: by providing a heat grid drainage pump 12, the power requirements for the drainage flow are provided.
Optionally, as shown in fig. 1, in some embodiments, an automatic steam trap 9 is further included, an automatic steam trap 9 is disposed on a pipeline between the primary air heater 3 and the heat supply network heater 10, and an automatic steam trap 9 is disposed on a pipeline between the supply air heater 4 and the heat supply network heater 10.
In the above alternative embodiment, it should be noted that in the existing unit, each boiler has 2 free floating ball type steam traps (capable of discharging saturated temperature condensed water), and the water discharge amount of the steam trap is selected according to the working pressure difference (the steam trap is selected according to 1.5 times of the steam consumption amount of the equipment per hour). 12 forged stop valves; most of pipelines and pipe fittings can be dismantled and used as wastes, and a few of pipelines and pipe fittings are purchased.
The beneficial effects of the above alternative embodiment are: by additionally arranging the automatic steam trap 9, after the heat supply network heater is utilized, the vibration of a steam trap pipeline is reduced, and the steam trap of the air heater is normally recycled.
Alternatively, as shown in FIG. 1, in some embodiments, automatic steam trap 9 is positioned in series alongside discharge gate 5.
In the above alternative embodiment, it should be noted that two automatic steam traps 9 and two discharge gates 5 are provided in series in the length direction of the bypass 7.
Optionally, as shown in fig. 1, in some embodiments, after the water quality is qualified, the added automatic steam trap 9 and the heat supply network heater 10 are used, the drained water of the primary air heater 3 and the air supply heater 4 flows automatically to the heat supply network heater 10 through the automatic steam trap 9 and the pressure difference drain, the water is supplied to the heat supply network by heating, and the drained water of the heat supply network heater 10 is discharged to the deaerator 6 through the heat supply network drain tank 11 and the heat supply network drain pump 12.
Alternatively, as shown in FIG. 1, in some embodiments, the heat net heater 10 is located 6-7 meters from the head of the heat net, with a standby port size DN 400.
Optionally, as shown in FIG. 1, in some embodiments, the second fixed bank flash tank 8 is located at an intermediate position of the bypass 7.
The beneficial effects of the above alternative embodiment are: through the arrangement, the reasonability of the layout is improved.
The main parameters of the above examples are given in the table below.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
In the present specification, the terms "upper", "lower", "left", "right", "middle", and the like are used for the sake of clarity only, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are also considered to be the scope of the present invention without substantial changes in the technical content.
Claims (10)
1. A drainage device of a boiler air heater of a thermal power plant comprises a steam turbine exhaust system (1), a first fixed-row flash tank (2), a primary air heater (3), an air supply air heater (4), a water drain door (5) and a deaerator (6), wherein the steam turbine exhaust system (1) and a main pipeline of the first fixed-row flash tank (2) are respectively connected with the primary air heater (3) and the air supply air heater (4) through pipelines, the primary air heater (3) and the air supply air heater (4) are respectively connected with the deaerator (6) through pipelines, the water drain door (5) is arranged on a pipeline between an outlet of the primary air heater (3) and the deaerator (6), the water drain door (5) is arranged on a pipeline between an outlet of the air supply air heater (4) and the deaerator (6), the system is characterized by further comprising a bypass (7) and a second fixed-row flash tank (8), wherein an outlet of the primary air heater (3) is connected with one end of the bypass (7), an outlet of the air supply heater (4) is connected with the other end of the bypass (7), and the bypass (7) is connected with the second fixed-row flash tank (8) through a pipeline.
2. The drainage device for the steam air heater of the thermal power plant boiler according to claim 1, further comprising a heat net heater (10), wherein the heat net heater (10) is arranged on a trunk pipeline between the two water discharge doors (5) and the deaerator (6).
3. The steam trap of a steam-electric power plant boiler heater according to claim 2, further comprising a heat-network steam trap box (11), wherein the heat-network steam trap box (11) is arranged on a pipeline between the heat-network heater (10) and the deaerator (6).
4. The steam trap of a steam-electric power plant boiler heater according to claim 3, wherein the heat network steam trap box (11) is communicated with the deaerator (6) through at least one pipeline.
5. The steam trap of the boiler air heater of the thermal power plant as claimed in claim 4, further comprising a heat network steam trap pump (12), wherein the heat network steam trap pump (12) is respectively arranged on all the pipelines between the heat network steam trap box (11) and the deaerator (6).
6. The steam trap of the boiler heater of the thermal power plant as claimed in claim 5, further comprising an automatic steam trap (9), wherein the automatic steam trap (9) is disposed on a pipeline between the primary air heater (3) and the heat grid heater (10), and the automatic steam trap (9) is disposed on a pipeline between the supply air heater (4) and the heat grid heater (10).
7. The steam trap of a steam-electric power plant boiler heater according to claim 6, characterized in that the automatic steam trap (9) is arranged in series beside the water discharge door (5).
8. The drain device for a steam air heater of a thermal power plant boiler as claimed in claim 7, wherein the heating network heater (10) is located at 6-7 meters from the head of the heating network.
9. The drain device for a steam air heater of a thermal power plant boiler as claimed in claim 8, wherein the size of the standby port of the heating network heater (10) is DN 400.
10. The drain device for a steam-electric power plant boiler heater according to claim 1, wherein the second fixed-row flash tank (8) is located at a middle position of the bypass (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120535052.4U CN214581006U (en) | 2021-03-15 | 2021-03-15 | Drainage device for boiler air heater of thermal power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120535052.4U CN214581006U (en) | 2021-03-15 | 2021-03-15 | Drainage device for boiler air heater of thermal power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214581006U true CN214581006U (en) | 2021-11-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120535052.4U Active CN214581006U (en) | 2021-03-15 | 2021-03-15 | Drainage device for boiler air heater of thermal power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214581006U (en) |
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2021
- 2021-03-15 CN CN202120535052.4U patent/CN214581006U/en active Active
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