CN219934697U - Steam drainage recovery system - Google Patents

Abstract

The utility model discloses a steam drainage recovery system which comprises a drainage expansion vessel, a steam turbine, an air preheater and a deaerator, wherein the drainage expansion vessel is provided with an inlet, a first outlet and a second outlet, the inlet is used for being communicated with a steam-flue gas heat exchanger so that saturated drainage flowing out of the steam-flue gas heat exchanger flows into the drainage expansion vessel, the steam turbine is communicated with the first outlet so that extraction steam flowing out of the steam turbine is converged with steam flowing out of the drainage expansion vessel, the air preheater is respectively communicated with the steam turbine and the drainage expansion vessel so that the converged steam flows into the air preheater, and the deaerator is communicated with the second outlet so that saturated water flowing out of the drainage expansion vessel flows into the deaerator. The steam drainage recovery system has the advantages of simple structure and reliable operation.

Description

Steam drainage recovery system

Technical Field

The utility model relates to a steam utilization technology of a garbage incineration power plant, in particular to an SGH heating steam drainage recovery system of the garbage incineration power plant.

Background

The SCR denitration technology of most waste incineration power plants adopts SGH, high-pressure saturated steam from a waste heat boiler steam drum is heated by SGH, and then vaporization heat is released to form high-pressure saturated drainage, and the saturated drainage flows into a drainage recovery system for recovery.

In the related art, the drainage recovery system is unreasonable to set up and has high cost.

Disclosure of Invention

The present utility model has been made based on the findings and knowledge of the inventors regarding the following facts and problems:

in the related technology, high-pressure saturated drain enters an SCR drain flash tank through a water inlet pipe, flash evaporation is carried out through capacity expansion and pressure reduction, secondary steam and saturated water are generated, the secondary steam is connected to a deaerator steam balance main pipe through the drain flash tank, the saturated water automatically flows into the deaerator for recovery through a drain regulating valve group, the working pressure of a general rotary film deaerator is 0.17Mpa (g), the back pressure of the drain flash tank is required to be slightly higher than the working pressure of the deaerator (the deaerator is prevented from being damaged due to the overhigh steam pressure), and the SCR drain flash tank is required to be arranged between deaerators. The water outlet pipeline is provided with a vent pipeline for discharging water during machine set shutdown maintenance, the discharged water is discharged by gravity to flow automatically and clean, the secondary steam pipe is provided with a pressure reducing valve group, the secondary steam pipe is connected to a deaerator steam balance main pipe, and the back pressure of the drainage expansion device can be regulated through the pressure reducing valve group, so that drainage of the expansion device flows into the deaerator through pressure difference.

Therefore, in the related art, the back pressure of the flash tank of the drainage recovery system is lower (slightly higher than the working pressure of the deaerator), and the high-grade heating steam is directly expanded to lower back pressure in a drainage way, so that high-grade energy is wasted, the overall heat efficiency is reduced, and the drainage flash tank is limited by the back pressure and the process flow of the drainage flash tank and can only be arranged between high-level deaerations, thereby increasing the construction cost.

The present utility model aims to solve at least one of the technical problems in the related art to some extent.

Therefore, the embodiment of the utility model provides the steam dewatering recovery system which is simple in structure, low in cost and high in heat energy utilization rate.

The steam hydrophobic recovery system according to an embodiment of the present utility model includes: a hydrophobic flash vessel having an inlet for communication with a steam-to-flue gas heat exchanger such that saturated hydrophobic water flowing out through the steam-to-flue gas heat exchanger flows into the hydrophobic flash vessel, a first outlet, and a second outlet; the steam turbine is communicated with the first outlet, so that extraction steam flowing out of the steam turbine is converged with steam flowing out of the drainage flash vessel; the air preheater is respectively communicated with the steam turbine and the drainage expander so that heated steam flows into the air preheater; and the deaerator is communicated with the second outlet, so that saturated water flowing out from the drainage flash tank flows into the deaerator.

According to the steam dewatering recovery system provided by the embodiment of the utility model, the dewatering expander, the steam turbine and the air preheater are arranged, so that the back pressure of the dewatering expander is improved, high-grade heating steam can be directly expanded to higher back pressure, the energy of high-pressure dewatering is fully utilized, the heat efficiency of high-pressure dewatering is improved, the dewatering expander is not required to be arranged between high-level deoxidization, and the construction cost of the steam dewatering recovery system is reduced.

In some embodiments, the steam trap recovery system further comprises a trap regulator, wherein the trap regulator is respectively communicated with the deaerator and the second outlet, so that saturated water flowing out from the trap regulator flows into the deaerator, and the trap regulator is used for carrying out steam-blocking drainage on the saturated water flowing out from the trap regulator so as to realize steam-water separation.

In some embodiments, the hydrophobic diffusion vessel further comprises a third outlet, the third outlet is arranged on the side surface of the hydrophobic diffusion vessel, and the third outlet is communicated with the hydrophobic regulator, so that when the water level of the water in the hydrophobic diffusion vessel is too high, the water in the hydrophobic diffusion vessel flows into the hydrophobic regulator through the third outlet.

In some embodiments, the steam dewatering and recovering system further comprises a communicating member, one end of the communicating member is communicated with the second outlet, and the other end of the communicating member is communicated with the deaerator, so that saturated water flowing out of the dewatering and expanding container flows into the deaerator through the communicating member when the dewatering and expanding container is overhauled.

In some embodiments, the vapor hydrophobic recovery system further comprises: the two ends of the first valve are respectively communicated with the first outlet and the steam turbine, so that the first valve controls the on-off of the first outlet and the steam turbine; the two ends of the second valve are respectively communicated with the second outlet and the drain regulator, so that the second valve controls the on-off of the second outlet and the drain regulator; and two ends of the third valve are respectively communicated with the water drain regulator and the deaerator, so that the third valve controls the on-off of the water drain regulator and the deaerator.

In some embodiments, the first outlet is provided at the top of the hydrophobic diffusion vessel and the second outlet is provided at the bottom of the hydrophobic diffusion vessel.

In some embodiments, the vapor drain recovery system further comprises a tank in communication with the drain flash vessel such that saturated water within the drain flash vessel flows into the flash vessel.

In some embodiments, the steam trap recovery system further comprises a double shut-off valve, one end of the double shut-off valve is adapted to communicate with the steam-flue gas heat exchanger, and the other end of the double shut-off valve is in communication with the inlet, such that the trap flowing out through the steam-flue gas heat exchanger flows into the trap through the double shut-off valve.

In some embodiments, the steam dewatering and recycling system further comprises a mixing pipe, one end of the mixing pipe is respectively communicated with the first outlet and the steam turbine, so that steam flowing out of the dewatering expansion vessel and extracted steam flowing out of the steam turbine both flow into the mixing pipe to be mixed, and the other end of the mixing pipe is communicated with the air preheater, so that steam flowing out of the mixing pipe flows into the air preheater.

In some embodiments, the vapor hydrophobic recovery system further comprises: a first check valve, both ends of which are respectively communicated with the first outlet and the mixing pipe; the two ends of the second check valve are respectively communicated with the mixing pipe and the steam turbine; and two ends of the third check valve are respectively communicated with the second outlet and the deaerator.

Drawings

FIG. 1 is a schematic diagram of a steam trap recovery system according to an embodiment of the present utility model.

A steam trap recovery system 100;

a hydrophobic diffusion vessel 1; an inlet 11; a first outlet 12; a second outlet 13; a third outlet 14;

a steam turbine 2; an air preheater 3; a deaerator 4; a water drain regulator 5; a communication member 6; a first valve 7; a second valve 8; a third valve 9; a fourth valve 10; a fifth valve 101; a liquid storage tank 102; a double shut-off valve 103; a first check valve 104; a second check valve 105; a third check valve 106; mixing tube 107.

Detailed Description

Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

A steam trap recovery system 100 according to an embodiment of the present utility model is described below with reference to the accompanying drawings.

As shown in fig. 1, a steam trap recovery system 100 according to an embodiment of the present utility model includes a trap 1, a steam turbine 2, an air preheater 3, and a deaerator 4.

The hydrophobic diffusion vessel 1 has an inlet 11, a first outlet 12 and a second outlet 13, the inlet 11 being adapted to communicate with a steam-flue gas heat exchanger (not shown in the figures) so that saturated hydrophobic water flowing out through the steam-flue gas heat exchanger flows into the hydrophobic diffusion vessel 1. Specifically, as shown in fig. 1, the hydrophobic diffusion vessel 1 is an SCR hydrophobic diffusion vessel 1, steam and hydrophobic water can be separated from the hydrophobic diffusion vessel 1, an inlet 11 can be communicated with an outlet of the steam-flue gas heat exchanger through a pressure hydrophobic pipeline, and saturated hydrophobic water flowing out of the steam-flue gas heat exchanger flows into the hydrophobic diffusion vessel 1, so that the hydrophobic water in the pressure hydrophobic pipeline is expanded and depressurized through the hydrophobic diffusion vessel 1.

The steam turbine 2 is in communication with the first outlet 12 so that the extracted steam from the steam turbine 2 heats the steam from the hydrophobic diffusion vessel 1. Specifically, as shown in fig. 1, the outlet of the air preheater of the steam turbine 2 is communicated with the first outlet 12, so that the low saturated steam flowing out of the drainage expansion vessel 1 and the high Wen Chouqi flowing out of the steam turbine 2 are mixed, and the low saturated steam is heated by the extracted steam to improve the superheat degree of the saturated steam.

The air preheater 3 is respectively communicated with the steam turbine 2 and the drainage flash tank 1, so that the heated steam flows into the air preheater 3. Specifically, as shown in fig. 1, the inlet of the air preheater 3 is communicated with the outlet of the steam turbine 2 and the outlet of the drain flash tank 1, so that the mixed low-pressure steam flows into the air preheater 3 and is supplied to a user after being heated by the air preheater 3, so as to supply heat to the user.

The deaerator 4 communicates with the second outlet 13 so that the saturated water flowing out through the hydrophobic diffusion vessel 1 flows into the deaerator 4. Specifically, as shown in fig. 1, the inlet of the deaerator 4 is communicated with the second outlet 13, and the low-pressure saturated water flowing out of the drainage flash tank 1 flows into the deaerator 4, is deaerated by the deaerator 4 and flows into the boiler again.

According to the steam dewatering and recycling system 100 provided by the embodiment of the utility model, the dewatering expander 1, the steam turbine 2 and the air preheater 3 are arranged, and because the steam flowing out of the dewatering expander 1 is directly mixed with the steam extracted from the steam turbine 2, compared with the prior art, the steam does not directly flow into the deaerator 4, so that the dewatering expander 1 can directly flash high-pressure steam (1. XMPA) to high-pressure steam and is mixed with the steam extracted from the steam turbine 2 for heating, the steam flows into the air preheater 3 and is heated to be a low-pressure steam source for a user, compared with the prior art, the back pressure of the dewatering expander 1 is improved, the high-grade heated steam can be directly expanded to the high back pressure, the high-pressure dewatering energy is fully utilized, the high-pressure dewatering heat efficiency is improved, and in addition, the pressure of the saturated water flowing out of the dewatering expander 1 (1. XMPA) is far greater than the pressure of the saturated water flowing out of the dewatering expander 1 in the prior art and the working pressure of the deaerator 4 (0.17 MPA), so that the dewatering expander 1 is arranged in the high-level deoxidization space is removed, and the steam recycling cost of the steam system 100 is reduced.

In some embodiments, the steam trap recovery system 100 further includes a trap 5, where the trap 5 is respectively in communication with the deaerator 4 and the second outlet 13, such that saturated water flowing out through the trap 1 flows into the deaerator 4 through the trap 5, and the trap 5 is used to block and drain the saturated water flowing out of the trap 4 to achieve steam-water separation. Specifically, as shown in fig. 1, the hydrophobic regulator 5 is a hydrophobic regulating valve, and functions as a steam-blocking water drain, so as to realize steam-water separation, an inlet of the hydrophobic regulator 5 is communicated with the second outlet 13, and an outlet of the hydrophobic regulator 5 is communicated with an inlet of the deaerator 4, so that low-pressure saturated water flowing out of the hydrophobic diffusion vessel 1 flows into the deaerator 4 through the hydrophobic regulator 5.

In some embodiments, the hydrophobic diffusion vessel 1 further comprises a third outlet 14, the third outlet 14 being provided at a side of the hydrophobic diffusion vessel 1, the third outlet 14 being in communication with the hydrophobic regulator 5, so that water in the hydrophobic diffusion vessel 1 flows into the hydrophobic regulator 5 through the third outlet 14 when the water level of the water in the hydrophobic diffusion vessel is too high. Specifically, as shown in fig. 1, the third outlet 14 is provided on the outer peripheral surface of the hydrophobic diffusion vessel 1, the third outlet 14 may be in communication with the inlet of the hydrophobic regulator 5, and when the water level of the low-pressure saturated water in the hydrophobic diffusion vessel 1 is too high, the low-pressure saturated water may flow into the hydrophobic regulator 5 through the third outlet 14, thereby preventing the water level of the hydrophobic diffusion vessel 1 from being too high to affect the working efficiency of the hydrophobic diffusion vessel 1.

In some embodiments, the steam trap recovery system 100 further comprises a communication member 6, one end of the communication member 6 is communicated with the second outlet 13, and the other end of the communication member 6 is communicated with the deaerator 4, so that saturated water flowing out of the trap 1 flows into the deaerator 4 through the communication member 6 when the trap 5 is overhauled. Specifically, as shown in fig. 1, the communicating member 6 includes a communicating pipe and an electromagnetic valve, the electromagnetic valve is provided in the communicating pipe to control on-off of the communicating pipe, an inlet of the communicating pipe is provided between the second outlet 13 and an inlet of the water trap 5 and is communicated with the second outlet 13, an outlet of the communicating pipe is provided between the deaerator 4 and an outlet of the water trap 5 and is communicated with the inlet of the deaerator 4, when the water trap 5 works normally, the electromagnetic valve is closed, and when the water trap 5 needs to be overhauled, the electromagnetic valve is opened so that low-pressure saturated water flowing out of the second outlet 13 flows into the deaerator 4 through the communicating pipe.

In some embodiments, the first outlet 12 is provided at the top of the hydrophobic diffusion vessel 1 and the second outlet 13 is provided at the bottom of the hydrophobic diffusion vessel 1. Therefore, low-pressure saturated steam and low-pressure saturated water conveniently flow out of the drainage expander 1, and the drainage expander 1 is more reasonable to set.

In some embodiments, the vapor hydrophobic recovery system 100 further comprises a liquid tank 102, the liquid tank 102 being in communication with the hydrophobic flash tank 1 such that saturated water within the hydrophobic flash tank 1 flows into the flash tank. Specifically, as shown in fig. 1, the inlet of the liquid storage tank 102 is communicated with the second outlet 13 of the hydrophobic diffusion tank 1, so that the surplus saturated water of the hydrophobic diffusion tank 1 can flow into the liquid storage tank 102 to store the saturated water flowing out of the hydrophobic diffusion tank 1.

Because the high-pressure saturated drain pipe is connected to the drain diffusion vessel 1 through the high-pressure saturated drain pipe, the pipeline belongs to vapor-liquid two-phase flow and has larger abrasion to the pipeline and accessories. Thus, in some embodiments, the steam trap recovery system 100 further comprises a double shut-off valve 103, one end of the double shut-off valve 103 being adapted to communicate with the steam-flue gas heat exchanger, the other end of the double shut-off valve 103 being in communication with the inlet, such that the effluent via the steam-flue gas heat exchanger flows through the double shut-off valve 103 into the trap 1. Specifically, as shown in fig. 1, the double shut-off valve 103 is formed by connecting two manual shut-off valves in series, the double shut-off valve 103 is arranged on a pipeline of the steam-flue gas heat exchanger and the inlet of the drainage flash tank 1, two electromagnetic valves are arranged and are not damaged at the same time, and when one of the two electromagnetic valves is damaged, the other one can still realize the shut-off function, so that the operation reliability and the safety of the steam drainage recovery system 100 are improved.

In some embodiments, the steam trap recovery system 100 further includes a mixing pipe 107, one end of the mixing pipe 107 is respectively connected to the first outlet 12 and the steam turbine 2, so that the steam flowing out through the trap 1 and the extracted steam flowing out of the steam turbine 2 both flow into the mixing pipe 107 to be mixed, and the other end of the mixing pipe 107 is connected to the air preheater 3, so that the steam flowing out through the mixing pipe 107 flows into the air preheater 3. Specifically, as shown in fig. 1, the inlet of the mixing pipe 107 is communicated with the first outlet 12 and the outlet of the steam turbine 2, so that the steam flowing out of the drain flash tank 1 and the extracted steam flowing out of the steam turbine 2 are mixed in the mixing pipe 107 to heat the steam flowing out of the drain flash tank 1, and the outlet of the mixing pipe 107 is communicated with the air preheater 3, so that the mixed steam flows into the air preheater 3.

In some embodiments, the vapor drain recovery system 100 further includes a first check valve 104, a second check valve 105, and a third check valve 106.

Both ends of the first check valve 104 communicate with the first outlet 12 and the mixing pipe 107, respectively. Specifically, as shown in fig. 1, the inlet of the first check valve 104 communicates with the first outlet 12, and the outlet of the first check valve 104 communicates with the inlet of the mixing pipe 107, thereby preventing the steam in the mixing pipe 107 from flowing back into the hydrophobic diffusion vessel 1.

The both ends of the second check valve 105 communicate with the mixing pipe 107 and the steam turbine 2, respectively, and specifically, as shown in fig. 1, the inlet of the second check valve 105 communicates with the outlet of the steam turbine 2, and the outlet of the second check valve 105 communicates with the inlet of the mixing pipe 107, thereby preventing the steam in the mixing pipe 107 from flowing back into the steam turbine 2.

The third check valve 106 communicates with the second outlet 13 and the deaerator 4 at both ends, respectively. Specifically, as shown in fig. 1, the inlet of the third check valve 106 communicates with the second outlet 13, and the outlet of the third check valve 106 communicates with the inlet of the deaerator 4, thereby preventing the saturated water flowing out of the second outlet 13 from flowing back into the hydrophobic diffusion tank 1.

In some embodiments, the steam trap recovery system 100 further comprises a first valve 7, a second valve 8, a third valve 9.

The two ends of the first valve 7 are respectively communicated with the first outlet 12 and the steam turbine 2, so that the first valve 7 controls the on-off of the first outlet 12 and the steam turbine 2. Specifically, as shown in fig. 1, the first valve 7 is a solenoid valve or a manual valve, the inlet of the first valve 7 communicates with the first outlet 12, and the outlet of the first valve 7 communicates with the inlet of the mixing pipe 107, whereby the on-off of the first outlet 12 and the mixing pipe 107 is controlled by the opening and closing of the first valve 7, thereby controlling the low pressure saturated steam flowing out from the first outlet 12.

Both ends of the second valve 8 are respectively communicated with the second outlet 13 and the drain regulator 5, so that the second valve 8 controls the on-off of the second outlet 13 and the drain regulator 5. Specifically, as shown in fig. 1, the second valve 8 is a solenoid valve or a manual valve, an inlet of the second valve 8 is communicated with the second outlet 13, an outlet of the second valve 8 is communicated with an inlet of the drain regulator 5, and the second valve 8 is located between the inlet of the communicating member 6 and the drain regulator 5, whereby the second outlet 13 and the drain regulator 5 are opened and closed by the second valve 8 to control the low pressure saturated water flowing out from the second outlet 13.

Both ends of the third valve 9 are respectively communicated with the water drain regulator 5 and the deaerator 4, so that the third valve 9 controls the on-off of the water drain regulator 5 and the deaerator 4. Specifically, as shown in fig. 1, the third valve 9 is a solenoid valve or a manual valve, the inlet of the third valve 9 is communicated with the outlet of the steam trap 5, the outlet of the third valve 9 is communicated with the inlet of the deaerator 4, and the third valve 9 is located between the outlet of the communicating member 6 and the steam trap 5, whereby the opening and closing of the outlet of the communicating member 6 and the steam trap 5 are controlled by the opening and closing of the third valve 9, thereby preventing low-pressure saturated steam in the communicating member 6 from flowing into the steam trap 5.

In some embodiments, the steam trap recovery system 100 further includes a fourth valve 10 and a fifth valve 101, where each of the fourth valve 10 and the fifth valve 101 may be a solenoid valve or a manual valve, and two ends of the fourth valve 10 are respectively communicated with the outlet of the communicating member 6 and the inlet 11 of the deaerator 4, so that the on-off between the outlet of the communicating member 6 and the deaerator 4 is controlled by the fourth valve 10, and two ends of the fifth valve 101 are respectively communicated with the inlet of the liquid storage tank 102 and the second outlet 13, so that the on-off between the inlet of the liquid storage tank 102 and the second outlet 13 is controlled by the fifth valve 101.

Various parameters of the steam trap recovery system 100 of the embodiment of the present utility model are as follows:

the high-pressure saturated hydrophobic pressure is P0=6.51 Mpa (g), the corresponding temperature t0=282 ℃, the hydrophobic capacity is q0=4.8 t/h, and the enthalpy checking value is hs0= 1247.17kj/kg;

the low-pressure saturated steam parameter P1=1.60 Mpa, the check enthalpy value is hq1= 2793.47kj/kg, and the vaporization latent heat r= 1921.39;

the corresponding low-pressure saturated hydrophobic parameter is P2=1.60 Mpa, the temperature is t2=t1=204 ℃, and the check enthalpy value is hs2= 872.08kj/kg.

The low-pressure saturated steam quantity is as follows: q1=q0 (hs 0-hs 2)/xr

Wherein x is the dryness of low-pressure saturated steam, which is taken to be 0.97, and Q1=0.97 t/h is calculated.

The low-pressure water-repellent capacity is as follows: q0-q1=4.8-0.97=3.83 t/h.

In the engineering example, the low-pressure steam for heating the air preheater 3 has the steam extraction pressure of 1.6Mpa, the temperature of 305 ℃, the checked enthalpy value of 3044.79kj/kg and the steam extraction amount of 5.9t/h.

After the conversion, the extraction amount of the air preheater of the steam turbine 2 can be saved by 0.89t/h. From this, it is understood that, when the pressure of the steam flowing out through the water repellent diffuser 1 is increased, the extraction of the steam from the turbine can be reduced, and the power generation efficiency of the turbine 2 can be improved.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (10)

1. A steam trap recovery system, comprising: a hydrophobic flash vessel having an inlet for communication with a steam-to-flue gas heat exchanger such that saturated hydrophobic water flowing out through the steam-to-flue gas heat exchanger flows into the hydrophobic flash vessel, a first outlet, and a second outlet; the steam turbine is communicated with the first outlet, so that extraction steam flowing out of the steam turbine is converged with steam flowing out of the drainage flash vessel; the air preheater is respectively communicated with the steam turbine and the drainage expander so that the converged steam flows into the air preheater; and the deaerator is communicated with the second outlet, so that saturated water flowing out from the drainage flash tank flows into the deaerator.

2. The vapor trap recovery system of claim 1, further comprising a trap regulator in communication with the deaerator and the second outlet, respectively, such that saturated water exiting through the trap regulator flows into the deaerator through the trap regulator, the trap regulator being configured to block vapor from exiting the trap regulator to effect vapor-water separation.

3. The vapor trap system of claim 2, wherein the trap further comprises a third outlet, the third outlet being provided on a side of the trap, the third outlet being in communication with the trap such that water in the trap flows into the trap through the third outlet when the water level in the trap is too high.

4. The steam trap recovery system of claim 2, further comprising a communication member having one end in communication with the second outlet and the other end in communication with the deaerator, such that when the trap is serviced, saturated water from the trap flash tank flows into the deaerator via the communication member.

5. The vapor drainage recovery system of claim 2, further comprising:

the two ends of the first valve are respectively communicated with the first outlet and the steam turbine, so that the first valve controls the on-off of the first outlet and the steam turbine;

the two ends of the second valve are respectively communicated with the second outlet and the drain regulator, so that the second valve controls the on-off of the second outlet and the drain regulator;

and two ends of the third valve are respectively communicated with the water drain regulator and the deaerator, so that the third valve controls the on-off of the water drain regulator and the deaerator.

6. The vapor drainage recovery system of claim 1, wherein said first outlet is provided at the top of said drainage flash vessel and said second outlet is provided at the bottom of said drainage flash vessel.

7. The vapor drainage recovery system of claim 1, further comprising a reservoir in communication with said drainage flash vessel such that saturated water within said drainage flash vessel flows into said flash vessel.

8. The vapor drainage recovery system of claim 1, further comprising a double shut-off valve, one end of said double shut-off valve adapted to communicate with said vapor-to-flue gas heat exchanger, and the other end of said double shut-off valve communicating with said inlet so that drain flowing out through said vapor-to-flue gas heat exchanger flows into said drain flash vessel through said double shut-off valve.

9. The steam trap recovery system of claim 1, further comprising a mixing pipe, one end of which is respectively communicated with the first outlet and the steam turbine so that steam flowing out through the trap and extracted steam flowing out of the steam turbine both flow into the mixing pipe to be mixed, and the other end of which is communicated with the air preheater so that steam flowing out through the mixing pipe flows into the air preheater.

10. The vapor drainage recovery system of claim 9, further comprising:

a first check valve, both ends of which are respectively communicated with the first outlet and the mixing pipe;

the two ends of the second check valve are respectively communicated with the mixing pipe and the steam turbine;

and two ends of the third check valve are respectively communicated with the second outlet and the deaerator.