CN215719112U - High-pressure water supply system - Google Patents
High-pressure water supply system Download PDFInfo
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- CN215719112U CN215719112U CN202120544786.9U CN202120544786U CN215719112U CN 215719112 U CN215719112 U CN 215719112U CN 202120544786 U CN202120544786 U CN 202120544786U CN 215719112 U CN215719112 U CN 215719112U
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Abstract
The utility model discloses a high-pressure water supply system, comprising: the first water supply branch comprises a hot fuel branch and a water removal and compensation branch which are sequentially communicated. The first water supply branch comprises a hot fuel branch and a water removal and supplement branch which are sequentially communicated, wherein the hot fuel branch is communicated with the output end of the water supply passage, and the hot fuel branch comprises a heat exchanger which is used for heating cold fuel into hot fuel; the water removal and supplement branch is communicated with the output end of the heat exchanger, and the other end of the water removal and supplement branch is communicated with the water return; and one end of the second water supply branch is connected with the output end of the water supply passage, and the other end of the second water supply branch is communicated with the steam turbine. The heating water source generated on the water supply passage enters the heat exchanger to heat natural gas, and the water replenishing system after heat exchange is completed, so that the water supply system meets the requirement of safe operation, the direct communication between the outlet side of the hot fuel branch and the water removing and replenishing branch is ensured, and the direct leading-out of the water removing and replenishing branch for supplying water to the combustion engine is realized.
Description
Technical Field
The utility model relates to the technical field of boiler combustion, in particular to a high-pressure water supply system.
Background
Along with the adjustment of national energy structure and industrial layout, the combined cycle unit not only needs to have the capabilities of large capacity, daily start and stop and power grid peak regulation, but also has the advantage of large heat supply load. In cold northern areas, a heating unit is mainly used, and the heating parameters are about 0.5MPa and 240 ℃; in the south of economic development, industrial steam extraction is mainly used, and the grade of the industrial steam is mostly 1.0-2.0 MPa. The steam extraction mode of the grade industrial steam has various forms, but is limited by various factors, the maximum heat supply capacity which can be achieved at present is about 300t/h, and the requirements of high concentration ratio and large steam consumption of paper mills, cotton mills and the like can not be met.
In order to improve the heat supply capacity of the combined cycle unit, the steam turbine adopts a single-cylinder back pressure steam turbine with steam exhaust as a heat supply parameter; that is, the waste heat boiler adopts a double-pressure system, the steam generated by the high-pressure steam drum enters the steam turbine to do work, and the exhaust steam is used for supplying heat, so that the steam generated by the low-pressure steam drum directly supplies heat. And a natural gas heating system is usually arranged for the combined cycle unit, low-grade heat generated by a boiler is converted into high-grade heat which participates in both Brayton cycle of a combustion engine and Rankine cycle of a steam turbine, and the low-grade heat generated by a waste heat boiler is utilized to heat natural gas to about 220 ℃ and then the natural gas is sent to a gas turbine to be combusted, expanded and used for doing work. When the pressure of industrial steam is 1.2MPa, the working pressure of a low-pressure steam drum is 1.2MPa, the corresponding saturated water temperature is 188 ℃, natural gas cannot be heated to 220 ℃ at the moment, and the pressure of a water side is lower than that of a natural gas side, and the pressure of the natural gas side is 4-5MPa generally, so that the safety operation requirement is not met, and the water supply for heating the natural gas cannot be directly led out from the side of a leading-out opening of a high-pressure pressurizer.
SUMMERY OF THE UTILITY MODEL
Therefore, the technical problem to be solved by the present invention is that the water supply system in the prior art cannot meet the requirement of safe operation, so that the water supply for heating natural gas cannot be directly led out from the outlet side of the high-pressure pressurizer.
To this end, the utility model provides a high-pressure water supply system comprising:
a water supply passage;
the first water supply branch comprises a hot fuel branch and a water removal and supplement branch which are sequentially communicated, wherein the hot fuel branch is communicated with the output end of the water supply passage, and the hot fuel branch comprises a heat exchanger which is used for heating cold fuel into hot fuel; the water removal and supplement branch is communicated with the output end of the heat exchanger, and the other end of the water removal and supplement branch is communicated with the water return;
and one end of the second water supply branch is connected with the output end of the water supply passage, and the other end of the second water supply branch is communicated with the steam turbine.
Optionally, in the above high-pressure water supply system, the water supply passage further includes: the device comprises a first water supply pump, a first pressure reducing valve, a vacuum deaerator, a low-pressure steam drum, a second water supply pump and a first heater; the vacuum deaerator is used for preliminarily deaerating feed water entering the vacuum deaerator; the low-pressure steam drum is used for generating steam which can be directly used for supplying heat.
Optionally, in the high-pressure water supply system, the hot fuel branch further includes a second pressure reducing valve and a safety valve connected in sequence;
the second pressure reducing valve is connected with the output end of the water supply passage, and the safety valve is connected with the heat exchanger;
the hot fuel branch also comprises a flow detection part and a shut-off valve;
the flow detection piece is used for detecting the flow of the hot fuel branch; the shutoff valve is two stop valves arranged in parallel.
Optionally, in the above high-pressure water supply system, the hot fuel branch further includes a pressure sensing element; the pressure sensing member is disposed between the second pressure reducing valve and the relief valve.
Optionally, in the high-pressure water supply system, the hot fuel branch further includes a temperature control element and a thermocouple, the temperature control element is communicated with the heat exchanger, and the temperature control element is used for adjusting the temperature of the fuel gas input to the heat exchanger; the thermocouple is used for feeding back the gas temperature.
Optionally, in the above high-pressure water supply system, the first water supply branch further includes: the condenser removing branch is connected with the water supplementing branch in parallel, one end of the condenser removing branch is communicated with the output end of the heat exchanger, and the other end of the condenser removing branch is communicated with the condenser.
Optionally, in the high-pressure water supply system, the water supply/discharge branch comprises a first flow adjusting element for adjusting the flow of the water supply/discharge; and/or
The condenser removing branch also comprises a second flow regulating element for regulating the flow input into the condenser.
Optionally, in the high-pressure water supply system, the water replenishing branch comprises a first check member, which is arranged at an output end of the first flow regulating member, and is used for preventing the back-replenishing water from flowing back; and/or
The condenser removing branch further comprises a second anti-stopping piece, and the second anti-stopping piece is arranged at the output end of the second flow regulating piece and used for preventing medium in the condenser from flowing back.
Optionally, in the high-pressure water supply system, the second water supply branch comprises a high-pressure steam drum, and the high-pressure steam drum is used for generating steam capable of directly supplying heat.
Optionally, in the high-pressure water supply system, the second water supply branch further includes a second heater, and the second heater is connected between the output end of the water supply passage and the high-pressure steam drum.
The technical scheme provided by the utility model has the following advantages:
according to the high-pressure water supply system provided by the utility model, the heating water source generated on the water supply passage enters the heat exchanger to heat natural gas, and the water replenishing system is fed back after heat exchange is completed, so that the water supply system meets the safe operation requirement, the direct communication between the outlet side of the hot fuel branch and the water replenishing branch is ensured, and the direct leading-out of the water replenishing branch for supplying water to the combustion engine is realized. And the cold fuel passes through the heat exchanger to form hot fuel, and enters the combustion engine after meeting the temperature requirement, so that the fuel combustion is ensured.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic flow diagram of a high pressure water supply system provided in example 1;
FIG. 2 is a schematic flow diagram of a high pressure water supply system provided in example 2;
description of reference numerals:
11-a first feed pump; 12-a first pressure relief valve; 13-vacuum deaerator; 14-a second feed pump; 15-low pressure steam drum; 16-a second feed pump; 17-a first heater;
21-a heat exchanger; 22-a second pressure relief valve; 23-a safety valve; 24-a flow detector; 25-a shut-off valve; 26-a pressure sensing member; 27-a temperature control; 28-a thermocouple;
31-a first flow regulating member; 32-a first backstop;
41-a second flow regulating member; 42-a second backstop;
51-high pressure steam drum; 52-second heater.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The present embodiment provides a high-pressure water supply system, as shown in fig. 1, including: the water supply device comprises a water supply passage, a first water supply branch and a second water supply branch. The first water supply branch comprises a hot fuel branch and a water removal and supplement branch which are sequentially communicated, wherein the hot fuel branch is communicated with the output end of the water supply passage, and the hot fuel branch comprises a heat exchanger 21 for heating cold fuel into hot fuel; the water removal and supplement branch is communicated with the output end of the heat exchanger 21, and the other end of the water removal and supplement branch is communicated with the water return; one end of the second water supply branch is connected with the output end of the water supply passage, and the other end of the second water supply branch is communicated with the steam turbine.
The high pressure water supply system that this embodiment provided, still including the intercommunication in proper order on the feedwater passageway: a first water feed pump 11, a first pressure reducing valve 12, a vacuum deaerator 13, a low-pressure steam pocket 15, a second water feed pump 1614 and a first heater 17; wherein, the vacuum deaerator 13 is used for preliminarily deaerating the feed water entering the vacuum deaerator; the low pressure drum 15 is used to generate steam that can be directly supplied with heat. Specifically, the feed water enters the vacuum deaerator 13 after passing through the first feed water pump 11 and the first pressure reducing valve 12, the feed water after preliminary deaerating enters the low-pressure steam drum 15 after passing through the second feed water pump 1614, the low-pressure economizer and the low-pressure heater (not shown in the figure), steam generated by the low-pressure steam drum 15 is used for directly supplying heat, and saturated water after thermal deaerating enters the first heater 17 after being boosted through the second feed water pump 1614. The first heater 17 is a high pressure heater.
As shown in fig. 1, the hot fuel branch further comprises a temperature control member 27 and a thermocouple 28, the temperature control member 27 is communicated with the heat exchanger 21, and the temperature control member 27 is used for regulating the temperature of the fuel gas input to the heat exchanger 21; the thermocouple 28 is used for feeding back the gas temperature. Wherein the temperature control member 27 is a temperature control valve.
And when the pressure of the heated water source is reduced by the second pressure reducing valve 22, the heated water source enters the heat exchanger 21 and heats natural gas, and after heat exchange is completed, the heated water source enters the water replenishing branch. When cold fuel such as cold natural gas passes through the temperature control member 27 and the heat exchanger 21, and enters the combustion engine after the temperature requirement is met; the thermocouple 28 feeds back the outlet gas temperature to a combustion engine control system (TCS), and the control system adjusts the opening of the temperature control element 27 according to the temperature feedback, so as to control the temperature of the natural gas entering the combustion engine.
As shown in fig. 1, the hot fuel branch further includes a second pressure reducing valve 22 and a relief valve 23 connected in sequence; the second pressure reducing valve 22 is connected to an output end of the feed water passage, and the safety valve 23 is connected to the heat exchanger 21.
As shown in fig. 1, the water replenishing branch comprises a first flow regulating member 31 for regulating the flow of the water replenishing output; the first flow regulating member 31 is a flow regulating valve. The high-pressure water supply system is provided with a flow regulating part for regulating the water supply flow entering the combustion engine when different combustion engine loads are applied.
In this embodiment, the second water supply branch comprises a high pressure steam drum 51, and the high pressure steam drum 51 is used for generating steam capable of directly supplying heat.
Example 2
The present embodiment provides, as shown in fig. 2, a difference from the high-pressure water supply system provided in embodiment 1 in that: the hot fuel branch further comprises a flow detector 24 and a shut-off valve 25; the flow detection part 24 is used for detecting the flow of the hot fuel branch; the shut-off valve 25 is two shut-off valves arranged in parallel. The hot fuel branch further comprises a pressure sensing member 26; the pressure sensing member is disposed between the second pressure reducing valve 22 and the safety valve 23. Specifically, the pressure sensing member 26 includes a plurality of pressure sensors connected in parallel.
As shown in fig. 2, the first water supply branch further includes a condenser removing branch, the condenser removing branch is connected in parallel with the water supply removing branch, one end of the condenser removing branch is communicated with the output end of the heat exchanger 21, and the other end of the condenser removing branch is communicated with the condenser. The condenser branch includes a second flow regulator 41, and the second flow regulator 41 is configured to regulate a flow rate of the input gas to the condenser.
In the start-stop stage and the low-load stage of the unit, when the water temperature at the outlet of the heat exchanger 21 is more than 155 ℃ or the load of the combustion engine is less than 155MW, the flow of heating water is controlled by a second flow regulating part 41 at the condenser removing side, and the water after heat exchange is returned to the condenser; along with the increase of the load of the combustion engine and the reduction of the outlet water temperature of the heat exchanger 21, the second flow regulating element 41 on the condenser removing side is gradually closed, the first flow regulating element 31 on the water removing and supplementing system side is gradually opened, and the total amount of return water on the two branches is regulated by the combustion engine control system; when the engine load is more than 125MW and the heat exchanger 21 outlet water temperature is less than 140 ℃, the flow rate of the heating water is controlled by the first flow rate adjusting member 31 on the water supply/removal system side, while the second flow rate adjusting member 41 is closed.
In this embodiment, the de-watering branch comprises a first check member 32, and the first check member 32 is disposed at the output end of the first flow regulating member 31 for preventing the back-watering water from flowing back; similarly, the condenser branch further comprises a second anti-stop element 42, and the second anti-stop element 42 is arranged at the output end of the second flow regulating element 41 and is used for preventing the medium in the condenser from flowing back. For example, the first check member 32 is a check valve; the second check member 42 is a check valve.
In this embodiment, the second water supply branch further includes a second heater 52, and the second heater 52 is connected between the output end of the water supply passage and the high-pressure steam drum 51.
By providing a bypass in the heat exchanger 21 and connecting between the gas outlet and the temperature control member 27. In the ignition and speed-up stages of the combustion engine, natural gas does not pass through the heat exchanger 21 but enters the combustion engine through a bypass; when the rotating speed reaches 2250rpm, the gas temperature control is put into operation, and the gas temperature control valve adjusts the gas outlet temperature according to the gas turbine load, further improving the control efficiency. It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.
Claims (10)
1. A high-pressure water supply system is characterized by comprising
A water supply passage;
the first water supply branch comprises a hot fuel branch and a water removal and supplement branch which are sequentially communicated, wherein the hot fuel branch is communicated with the output end of the water supply passage, and the hot fuel branch comprises a heat exchanger (21) for heating cold fuel into hot fuel; the water removal and supplement branch is communicated with the output end of the heat exchanger (21), and the other end of the water removal and supplement branch is communicated with the water supplement;
and one end of the second water supply branch is connected with the output end of the water supply passage, and the other end of the second water supply branch is communicated with the steam turbine.
2. The high pressure water supply system of claim 1, further comprising, in series communication with the feed water passageway: the device comprises a first water supply pump (11), a first pressure reducing valve (12), a vacuum deaerator (13), a low-pressure steam pocket (15), second water supply pumps (16) and (14) and a first heater (17); wherein, the vacuum deaerator (13) is used for preliminarily deaerating the feed water entering the vacuum deaerator; the low-pressure steam drum (15) is used for generating steam which can be directly used for supplying heat.
3. A high-pressure water supply system according to claim 1, wherein said hot fuel branch further comprises a second pressure reducing valve (22) and a safety valve (23) connected in series;
the second pressure reducing valve (22) is connected to an output end of the water supply passage, and the safety valve (23) is connected to the heat exchanger (21).
4. A high-pressure water supply system according to claim 3, characterized in that said hot fuel branch further comprises a flow detection member (24) and a shut-off valve (25); the flow detection part (24) is used for detecting the flow of the hot fuel branch; the shutoff valve (25) is two stop valves arranged in parallel;
the hot fuel branch further comprises a pressure sensing member (26); the pressure sensing member is disposed between the second pressure reducing valve (22) and the safety valve (23).
5. The high-pressure feedwater system of any of claims 1-4 wherein the hot fuel branch further comprises a thermocouple (28) and a temperature control (27), the temperature control (27) being in communication with the heat exchanger (21), the temperature control (27) being for regulating the temperature of the fuel gas input to the heat exchanger (21); the thermocouple (28) is used for feeding back the temperature of the fuel gas.
6. The high pressure water supply system of claim 5, wherein said first water supply branch further comprises: and the condenser removing branch is connected with the water supplementing and removing branch in parallel, one end of the condenser removing branch is communicated with the output end of the heat exchanger (21), and the other end of the condenser removing branch is communicated with the condenser.
7. A high-pressure water supply system according to claim 6, characterised in that the de-watering branch comprises a first flow regulating member (31) for regulating the flow of the re-watering output; and/or
The condenser removing branch also comprises a second flow regulating element (41) which is used for regulating the flow input into the condenser.
8. The high pressure water supply system according to claim 7,
the water removal and supplement branch comprises a first check member (32) arranged at the output end of the first flow regulating member (31) and used for preventing the back supplement water from flowing back; and/or
The condenser removing branch further comprises a second anti-stopping piece (42) which is arranged at the output end of the second flow regulating piece (41) and used for preventing medium in the condenser from flowing back.
9. A high-pressure water supply system according to claim 5, characterized in that the second water supply branch comprises a high-pressure steam drum (51), the high-pressure steam drum (51) being adapted to generate steam for direct heating.
10. The high-pressure water supply system according to claim 9, wherein the second water supply branch further comprises a second heater (52), and the second heater (52) is connected between the output end of the water supply path and the high-pressure steam drum (51).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120544786.9U CN215719112U (en) | 2021-03-16 | 2021-03-16 | High-pressure water supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120544786.9U CN215719112U (en) | 2021-03-16 | 2021-03-16 | High-pressure water supply system |
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| Publication Number | Publication Date |
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| CN215719112U true CN215719112U (en) | 2022-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120544786.9U Active CN215719112U (en) | 2021-03-16 | 2021-03-16 | High-pressure water supply system |
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| CN (1) | CN215719112U (en) |
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2021
- 2021-03-16 CN CN202120544786.9U patent/CN215719112U/en active Active
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