CN111520792B - Exhaust steam waste heat recovery and heat supply method for direct air cooling unit - Google Patents
Exhaust steam waste heat recovery and heat supply method for direct air cooling unit Download PDFInfo
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- CN111520792B CN111520792B CN202010358247.6A CN202010358247A CN111520792B CN 111520792 B CN111520792 B CN 111520792B CN 202010358247 A CN202010358247 A CN 202010358247A CN 111520792 B CN111520792 B CN 111520792B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D1/00—Steam central heating systems
- F24D1/04—Steam central heating systems operating with exhaust steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1003—Arrangement or mounting of control or safety devices for steam heating systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/16—Waste heat
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Abstract
The invention provides a method for recovering and supplying heat by using exhaust steam waste heat of a direct air cooling unit, wherein a system for recovering and supplying heat by using the exhaust steam waste heat of the direct air cooling unit comprises a heat supply network condenser; the high back pressure heat supply unit air cooling island and the steam exhaust device thereof are connected through a first steam exhaust pipe and a first steam exhaust condensate pipe; the adjacent unit air cooling island and the adjacent steam exhaust device are connected through a second steam exhaust pipe and a second steam exhaust condensate pipe; the first exhaust steam pipe is connected with the heat supply network condenser through a third exhaust steam pipe; the second exhaust steam pipe is connected with the heat supply network condenser through a fifth exhaust steam pipe; the first steam exhaust pipe is connected with the second steam exhaust pipe through a fourth steam exhaust pipe. In the heating period, the exhaust steam of the high-back-pressure heat supply unit can realize thermoelectric decoupling operation by controlling the steam quantity led to the heat supply network condenser and the air cooling island on the air conditioner, and the air cooling island is always completely isolated to ensure safety and freeze prevention; in addition, when the high back pressure heat supply unit is shut down, the waste heat of the exhaust steam close to the machine can be led to the heat supply network condenser to supplement heat supply, and the heat supply guarantee is improved.
Description
Technical Field
The invention relates to the field of heat supply, in particular to a method for recovering waste steam and heat of a direct air cooling unit.
Background
For a pure condensing thermal power generating set, the loss of a steam turbine exhaust cold source accounts for more than 50% of the input heat of energy, which belongs to exhaust waste heat for a thermal power generating steam turbine, but belongs to serious waste of energy for resident heating with lower energy quality requirement. The high back pressure heat supply technology (also called low-level energy heat supply technology) is an energy-saving heat supply technology capable of effectively recovering the exhaust steam waste heat of the unit for heating, namely, the circulating water return of a heat supply network is used as the exhaust steam cooling water to directly recover the exhaust steam waste heat of the unit for heating in the heating period, the technology realizes the effective recovery and utilization of the exhaust steam waste heat of the unit, the heat supply capacity of the unit is greatly improved, and the heat supply energy consumption cost is reduced.
For a direct air cooling unit, in order to realize the recovery of the waste heat of the exhausted steam of the unit, an isolation valve is additionally arranged on a steam exhaust branch pipe above an air cooling island, a bypass branch pipe is additionally arranged on a main steam exhaust pipeline from a low-pressure cylinder of a steam turbine to the air cooling island, and the exhausted steam of the unit is led to a newly-added heat supply network condenser. In the heating period, the exhaust steam volume entering the air cooling island and the heat supply network condenser can be respectively adjusted according to different heat supply load requirements of residents, and the requirements of thermoelectric decoupling and flexible operation of the unit can be met. However, since the isolation valves on the steam exhaust branch pipes of the air cooling island are generally large-caliber vacuum isolation valves above DN2000, when the ambient temperature is low in winter, the valves frequently act, and the danger of untight closing and steam leakage and freezing of the branch pipes of the air cooling island easily occurs. In order to avoid the air cooling island from freezing, the steam can be always fed into the reserved branch rows in the whole heating period, but a large energy loss can be formed; the most ideal operation mode is that the isolation valves of the steam exhaust branch pipes above the air cooling island are all closed in the whole heating period, and the exhaust steam of the unit is all led to the heat supply network condenser for heating, but the defects of electricity fixation by heat and inflexible operation exist, and the peak regulation requirement of a power grid cannot be met. Therefore, when the conventional air cooling unit is used for high-back-pressure heat supply, the problems of flexible operation and incapability of preventing freezing of the air cooling island exist.
In addition, for a thermal power plant provided with two air cooling units, the thermal power plant is limited by the scale of the peripheral heat supply market, generally only one air cooling unit is subjected to high back pressure heat supply technical transformation, the other unit still adopts a conventional extraction and condensation type operation mode, once the high back pressure heat supply unit breaks down and stops, the heat supply capacity of the whole plant only depending on one extraction and condensation unit cannot meet the heat supply guarantee requirement, and the heat supply safety of residents is influenced.
Disclosure of Invention
Technical problem to be solved
In order to solve the problems in the prior art, the invention provides a method for recovering waste steam and heat of a direct air cooling unit, which is used for solving the problems that flexible operation and air cooling island freezing prevention cannot be achieved in the high-back-pressure heat supply operation of a conventional air cooling unit.
(II) technical scheme
In order to achieve the above object, the present invention provides an exhaust steam waste heat recovery heating system for a direct air cooling unit, comprising:
a heat supply network condenser;
the high-back-pressure heat supply unit comprises a high-back-pressure heat supply unit air cooling island and a high-back-pressure heat supply unit steam exhaust device, the high-back-pressure heat supply unit air cooling island and the high-back-pressure heat supply unit steam exhaust device are connected through a first steam exhaust pipe and a first steam exhaust condensate pipe, and the first steam exhaust pipe is connected with the heat supply network condenser through a third steam exhaust pipe;
the adjacent unit comprises an adjacent unit air cooling island and an adjacent unit steam exhaust device, and the adjacent unit air cooling island is connected with the adjacent unit steam exhaust device through a second steam exhaust pipe and a second steam exhaust condensate pipe;
the first steam exhaust pipe is connected with the second steam exhaust pipe through a fourth steam exhaust pipe, the first steam exhaust condensate pipe is connected with the second steam exhaust condensate pipe through a third steam exhaust condensate pipe, the fourth steam exhaust pipe is provided with a first valve, and the third steam exhaust condensate pipe is provided with a second valve;
be provided with the third valve on the first exhaust steam pipe, the third valve is located first exhaust steam pipe with the low reaches of the junction of fourth exhaust steam pipe, the upper reaches of high back pressure heat supply unit air-cooling island, be provided with the fourth valve on the third exhaust steam pipe.
Preferably, the first steam exhaust pipe is provided with a fifth valve, and the fifth valve is positioned at the upstream of the connection position of the first steam exhaust pipe and the third steam exhaust pipe.
Preferably, the second exhaust steam pipe is connected with the heat supply network condenser through a fifth exhaust steam pipe, and a sixth valve is arranged between the fifth exhaust steam pipes.
Preferably, the second steam exhaust pipe is provided with a seventh valve, and the seventh valve is located at the downstream of the connection position of the second steam exhaust pipe and the fourth steam exhaust pipe.
Preferably, the fourth steam exhaust pipe is provided with a first flow monitoring device; and the third exhaust steam condensate pipe is provided with a second flow monitoring device.
The direct air cooling unit exhaust steam waste heat recovery and heat supply method is implemented based on a direct air cooling unit high back pressure heat supply system and is characterized by comprising the following steps: and in the heating period, controlling the third valve to be always in a closed state and controlling the exhaust steam discharged by the steam discharge device of the high-back-pressure heat supply unit to enter the heat supply network condenser.
Preferably, the step of controlling the exhaust steam discharged by the steam discharge device of the high-back-pressure heat supply unit to enter the heat supply network condenser comprises the following steps: the step of controlling the exhaust steam discharged by the steam exhaust device of the high back pressure heat supply unit to enter the heat supply network condenser comprises the following steps: when the power generation load is high and the exhaust steam waste heat cannot be completely cooled by the heat supply network condenser, controlling the first valve and the second valve to be in an open state, dividing exhaust steam discharged by the exhaust steam device of the high-back-pressure heat supply unit into two parts, wherein one part of the exhaust steam enters the heat supply network condenser, the other part of the exhaust steam enters the air cooling island of the adjacent unit through the fourth exhaust steam pipe for cooling, and returning corresponding part of exhaust steam condensate to the exhaust steam device of the high-back-pressure heat supply unit through the third exhaust steam condensate pipe; when the power generation load is low and the waste steam and waste heat can be cooled by the heat supply network condenser, the first valve and the second valve are controlled to be in a closed state, and all the waste steam discharged by the steam discharge device of the high-back-pressure heat supply unit enters the heat supply network condenser.
Preferably, the method for recovering waste steam and heat of the direct air cooling unit further comprises the following steps: the method is characterized in that the method for recovering and supplying the heat by the exhaust steam waste heat of the direct air cooling unit further comprises the following steps: and controlling the opening degrees of the first valve and the second valve to enable the flow of the dead steam in the fourth dead steam pipe to be equal to the flow of the condensate of the dead steam condensate.
The direct air cooling unit exhaust steam waste heat recovery and heat supply method is implemented based on a direct air cooling unit high back pressure heat supply system and is characterized by comprising the following steps: in the heating period, when the high-back-pressure heating unit is in fault shutdown, the first valve and the second valve are controlled to be in an open state, the third valve is controlled to be closed, and the fifth valve is controlled to be closed: the seventh valve is opened, and partial exhaust steam discharged by the steam discharge device of the adjacent unit enters the heat supply network condenser through the fourth exhaust steam pipe; and the seventh valve is closed, and all the exhaust steam discharged by the steam discharge devices of the adjacent units enters the heat supply network condenser through the fourth exhaust steam pipe.
The direct air cooling unit exhaust steam waste heat recovery and heat supply method is implemented based on a direct air cooling unit high back pressure heat supply system and is characterized by comprising the following steps: in the heating period, when the high-back-pressure heating unit is in a fault shutdown state, the first valve and the second valve are controlled to be in a closed state, the third valve is controlled to be closed, the fourth valve is controlled to be closed, and the sixth valve is controlled to be opened: the seventh valve is opened, and partial exhaust steam discharged by the steam discharge device of the adjacent unit enters the heat supply network condenser through the fifth exhaust steam pipe; and the seventh valve is closed, and all the exhaust steam discharged by the steam discharge devices of the adjacent units enters the heat supply network condenser through the fourth exhaust steam pipe.
(III) advantageous effects
The invention has the advantages that the high-back-pressure heat supply unit is connected with the exhaust steam pipe and the exhaust steam condensate pipeline of the adjacent unit, the exhaust steam pipe of the adjacent unit is connected with the heat supply network condenser, in the heating period, the exhaust steam of the high-back-pressure heat supply unit can control the steam quantity led to the heat supply network condenser and the adjacent air cooling island to realize the thermoelectric decoupling operation, and the high-back-pressure heat supply unit can always completely isolate the air cooling island to ensure the safety and the freeze prevention of the unit; in addition, when the high back pressure heat supply unit is shut down, the waste heat of the exhaust steam close to the machine can be led to a heat supply network condenser to supplement heat supply, and the heat supply guarantee of the whole plant is improved.
Drawings
Fig. 1 is a schematic structural diagram of an exhaust steam waste heat recovery heating system of a direct air cooling unit.
[ description of reference ]
1: a first valve; 2: a second valve; 3: a third valve; 4: a fourth valve; 5: a fifth valve; 6: a sixth valve; 7: a seventh valve; 8: a first flow monitoring device; 9: a second flow monitoring device;
10: a steam exhaust device of the high back pressure heat supply unit; 11: an adjacent unit steam exhaust device; 12: a high back pressure heat supply unit air cooling island; 13: an adjacent unit air cooling island; 14: a heat supply network condenser;
20: a first exhaust pipe; 21: a first dead steam condensate pipe; 22: a third exhaust pipe; 23: a second exhaust pipe; 24: a second exhaust steam condensate pipe; 25: a fourth exhaust pipe; 26: a fifth exhaust pipe; 27: and a third exhaust steam condensate pipe.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1, the present invention provides an exhaust steam waste heat recovery heating system of a direct air cooling unit, which includes a heat supply network condenser 14, a high back pressure heating unit, and adjacent units. The heat supply network condenser 14 is used for supplying heat to heat users; the high-back-pressure heat supply unit comprises a high-back-pressure heat supply unit steam exhaust device 10 and a high-back-pressure heat supply unit air cooling island 12, the high-back-pressure heat supply unit steam exhaust device and the high-back-pressure heat supply unit air cooling island 12 are connected through a first steam exhaust pipe 20 and a first steam exhaust condensate pipe 21, the first steam exhaust pipe 20 is connected with a heat supply network condenser 14 through a third steam exhaust pipe 22, all the steam exhaust exhausted by the high-back-pressure heat supply unit steam exhaust device 10 enters the heat supply network condenser 14 to be cooled in a heating period, and the cooled steam exhaust condensate returns to the high-back-pressure heat supply unit steam exhaust device 10. In the non-heating period, all the exhaust steam discharged by the steam discharge device 10 of the high-back-pressure heat supply unit enters the air cooling island 12 of the high-back-pressure heat supply unit for cooling, and the exhaust steam condensate water obtained by cooling returns to the steam discharge device of the high-back-pressure heat supply unit from the exhaust steam condensate pipe for recycling.
The adjacent unit comprises an adjacent unit steam exhaust device 11 and an adjacent unit air cooling island 13, the adjacent unit steam exhaust device and the adjacent unit air cooling island 13 are connected through a second steam exhaust pipe 23 and a second steam exhaust condensate pipe 24, all the steam exhaust discharged by the adjacent unit steam exhaust device 11 enters the adjacent unit air cooling island 13 to be cooled, and the steam exhaust condensate water obtained by cooling returns to the steam exhaust device of the adjacent unit from the steam exhaust condensate pipe to be recovered. The first exhaust steam pipe 20 is connected with the second exhaust steam pipe 23 through a fourth exhaust steam pipe 25, the first exhaust steam condensate pipe 21 is connected with the second exhaust steam condensate pipe 24 through a third exhaust steam condensate pipe 27, the fourth exhaust steam pipe 25 is provided with a first valve 1, and the third exhaust steam condensate pipe 27 is provided with a second valve 2; the first exhaust steam pipe 20 is provided with a third valve 3, the third valve 3 is positioned at the downstream of the joint of the first exhaust steam pipe 20 and the fourth exhaust steam pipe 25 and positioned at the upstream of the high back pressure heat supply unit air cooling island, and the third exhaust steam pipe 22 is provided with a fourth valve 4.
A conventional high-back-pressure heat supply system can adjust the steam exhaust amount entering an air cooling island 13 and a heat network condenser 14 of the high-back-pressure heat supply unit by controlling opening and closing of a third valve 3 according to the heat supply load demand of residents and the change of the power generation load of the unit in the heating period, so that the high-back-pressure heat supply unit can realize flexible thermoelectric decoupling operation, but because the third valve 3 is a large-caliber vacuum isolation valve with the DN2000 or more, when the ambient temperature is low in winter, the valve is easy to close untight due to frequent actions, and the risk of steam leakage freezing of an air cooling island support is high, if the air cooling island is protected against freezing, the third valve 3 is closed all the time in the heating period, and the high-back-pressure heat supply unit can only adopt the operation mode of fixing the electricity by heat, namely, the generated energy is determined according to the size of the heat supply load, and the heat supply flexibility is reduced. In addition, once the high back pressure heat supply unit is in fault shutdown, the exhaust steam heat of the unit cannot be recovered, and the heat supply guarantee of the power plant is reduced.
In order to solve the problems of flexibility of the high-backpressure heat supply unit and freezing prevention of the air cooling island 12 of the high-backpressure heat supply unit: increasing a fourth exhaust pipe 25 of the high back pressure heat supply unit and the adjacent unit, and arranging a first isolating door on the fourth exhaust pipe 25; correspondingly, an air cooling island of the high-back-pressure heat supply unit and a third exhaust steam condensate pipe 27 of the air cooling island of the adjacent unit are added, a second valve 2 is additionally arranged on the third exhaust steam condensate pipe 27, the steam inlet third valve 3 of the air cooling island 12 of the high-back-pressure heat supply unit is always closed in the whole heating period, all exhaust steam discharged by the steam discharge device 10 of the high-back-pressure heat supply unit enters the heat supply network condenser 14, and safe operation of the air cooling island is guaranteed. If the power generation load of the high back pressure heat supply unit is high and the heat of the exhaust steam cannot be completely recovered by the heat supply network condenser for heating, the first valve 1 on the fourth exhaust steam pipe 25 and the second valve 2 on the third exhaust steam condensate pipe 27 are opened, the exhaust steam discharged by the exhaust steam device 10 of the high back pressure heat supply unit is divided into two parts, one part enters the heat supply network condenser 14, and the other part enters the air cooling island 13 of the adjacent unit through the fourth exhaust steam pipe 25 for cooling. If the power generation load of the high back pressure heat supply unit is low and the waste steam heat can be completely recovered, the first valve 1 and the second valve 2 are closed, and the waste steam of the high back pressure heat supply unit completely enters the heat supply network condenser for heating. Therefore, the heat supply flexibility of the air cooling high back pressure heat supply unit is improved while the air cooling island is completely isolated and prevented from freezing in the heating period.
In a more preferred embodiment, referring to fig. 1, the first spent steam pipe 20 is provided with a fifth valve 5, the fifth valve 5 being located upstream of the connection of the first and third spent steam pipes 20, 22. Once the high back pressure heat supply unit stops due to a fault in the heating period, in order to guarantee heat supply, the fifth valve 5 is closed, the first valve 1 and the second valve 2 are opened, the third valve 3 is still kept closed, and partial exhaust steam discharged by the steam discharge devices 11 of the adjacent units enters the heat supply network condenser 14 through the fourth exhaust steam pipe 25, so that the heat supply guarantee capacity can be effectively improved.
In another embodiment, referring to fig. 1, the second exhaust pipe 23 is connected to the heat supply network condenser through a fifth exhaust pipe 26, and a sixth valve 6 is disposed between the fifth exhaust pipes 26. Once the high back pressure heat supply unit stops due to a fault in the heating period, the fourth valve 4 is closed, the sixth valve 6 is opened to ensure heat supply, the third valve 3 is still closed, partial exhaust steam discharged by the steam discharge device 11 of the adjacent unit enters the heat supply network condenser 14 through the fifth exhaust steam pipe 26, and the heat supply guarantee capacity can be effectively improved.
Furthermore, the second exhaust steam pipe 23 is provided with a seventh valve 7, the seventh valve 7 is located at the downstream of the connection position of the second exhaust steam pipe 23 and the fourth exhaust steam pipe 25, once the high back pressure heat supply unit stops working due to a fault in the heating period, the seventh valve 7 can be closed, and all the exhaust steam discharged by the steam discharge devices 11 of the adjacent units enters the heat supply network condenser 14 through the fourth exhaust steam pipe 25 or the fifth exhaust steam pipe 26, so that the heat supply capacity is fully guaranteed.
Further, the fourth exhaust steam pipe 25 is provided with a first flow monitoring device 8; the third exhaust steam condensate pipe 27 is provided with a second flow monitoring device 9, in the running process of transferring the exhaust steam of the high back pressure heat supply unit to the adjacent unit air cooling island 13, the flow on the fourth exhaust steam pipe 25 and the exhaust steam condensate communicating pipe of the air cooling island are monitored, namely the first flow monitoring device 8 and the second flow monitoring device 9 are monitored, then the opening degree of the first valve 1 and the second valve 2 is adjusted according to the flow information displayed on the first flow monitoring device 8 and the second flow monitoring device 9, the equivalent amount of the exhaust steam led to the exhaust steam communicating pipe and the condensate returning from the exhaust steam condensate communicating pipe can be ensured, and the electricity generation of the direct air cooling unit can not be influenced by the exhaust steam.
The invention also provides a method for recovering and supplying the waste heat of the exhaust steam of the direct air cooling unit, referring to fig. 1, in the whole heating period, the third valve 3 for controlling the steam inlet of the air cooling island 12 of the high back pressure heat supply unit to be always closed, and the exhaust steam discharged by the steam discharging device 10 of the high back pressure heat supply unit to enter the heat network condenser 14, so that the safe operation of the air cooling island is ensured.
Further, the step of controlling the exhaust steam discharged by the steam discharging device of the high back pressure heat supply unit to enter the heat supply network condenser comprises the following steps: if the power generation load of the high-back-pressure heat supply unit is high and the exhaust steam heat cannot be completely recycled for the heating period, the first valve 1 on the fourth exhaust steam pipe 25 and the second valve 2 on the third exhaust steam condensate pipe 27 are opened, the exhaust steam discharged by the exhaust steam device 10 of the high-back-pressure heat supply unit is divided into two parts, one part enters the heat supply network condenser 14, and the other part enters the adjacent unit air cooling island 13 through the fourth exhaust steam pipe 25 for cooling. If when the power generation load of the back pressure heat supply unit is low, and the exhaust steam heat can be completely recovered, the first valve 1 and the second valve 2 are closed, and the exhaust steam of the high back pressure heat supply unit completely enters the heat supply network condenser for heating. Thus, the heat supply flexibility of the air cooling high back pressure heat supply unit is improved while the air cooling island is completely isolated and the air cooling island is ensured to be anti-freezing in the heating period,
the method for recovering and supplying the waste steam and the waste heat of the direct air cooling unit further comprises the following steps: in the running process of transferring the exhaust steam of the high back pressure heat supply unit to the air cooling island 13 of the adjacent unit, the flow on the fourth exhaust steam pipe 25 and the exhaust steam condensate communicating pipe of the air cooling island are monitored, namely the first flow monitoring device 8 and the second flow monitoring device 9 are monitored, the equivalent amount of the exhaust steam led to the exhaust steam communicating pipe and the condensate returning from the exhaust steam condensate communicating pipe is ensured, and the power generation of the direct air cooling unit can be ensured not to be influenced by the exhaust steam.
The invention also provides a method for recovering and supplying heat by using the exhaust steam waste heat of the direct air cooling unit, referring to fig. 1, under the condition that a fifth exhaust steam pipe 26 and a sixth valve 6 are not additionally arranged, in order to improve the heat supply guarantee, the first exhaust steam pipe 20 is provided with a fifth valve 5, and the fifth valve 5 is positioned at the upstream of the connection part of the first exhaust steam pipe 20 and the third exhaust steam pipe 22. Once the high back pressure heat supply unit stops working due to faults in the heating period, the third valve 3 is still closed, the fourth valve 4 is still opened, the fifth valve 5 is closed, the first valve 1 and the second valve 2 are opened, the seventh valve 7 is opened, and partial exhaust steam discharged by the steam discharge devices 11 of the adjacent units enters the heat supply network condenser 14 through the fourth exhaust steam pipe 25, so that the heat supply guarantee capacity can be effectively improved. Furthermore, the seventh valve 7 can be closed, and all the exhaust steam discharged by the steam discharge device 11 of the adjacent unit enters the heat supply network condenser 14 through the fourth exhaust steam pipe 25, so that the heat supply is fully ensured.
The invention also provides another method for recovering and supplying the exhaust steam waste heat of the direct air cooling unit, referring to fig. 1, under the condition that a fifth valve is not additionally arranged, the second exhaust steam pipe 23 is connected with the heat supply network condenser through a fifth exhaust steam pipe 26, and a sixth valve 6 is arranged between the fifth exhaust steam pipes 26. Once the high back pressure heat supply unit stops working due to faults in the heating period, the first valve and the second valve are controlled to be in a closed state, the third valve 3 is still kept closed, the fourth valve 4 is closed, the sixth valve 6 is opened, the seventh valve 7 is opened, and partial exhaust steam discharged by the steam discharge devices 11 of the adjacent units enters the heat supply network condenser 14 through the fifth exhaust steam pipe 26, so that the heat supply guarantee capacity can be effectively improved. Furthermore, the seventh valve 7 can be closed, and all the exhaust steam discharged by the steam discharge device 11 of the adjacent unit enters the heat supply network condenser 14 through the fourth exhaust steam pipe 25, so that the heat supply is fully ensured.
It should be understood that the above description of the specific embodiments of the present invention is only for the purpose of illustrating the technical lines and features of the present invention, and is intended to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, but the present invention is not limited to the above specific embodiments. It is intended that all such changes and modifications as fall within the scope of the appended claims be embraced therein.
Claims (8)
1. The direct air cooling unit exhaust steam waste heat recovery heat supply method is characterized in that the direct air cooling unit exhaust steam waste heat recovery heat supply method is implemented based on a direct air cooling unit exhaust steam waste heat recovery heat supply system, and the direct air cooling unit exhaust steam waste heat recovery heat supply system comprises: a heat supply network condenser;
the high-back-pressure heat supply unit comprises a high-back-pressure heat supply unit air cooling island and a high-back-pressure heat supply unit steam exhaust device, the high-back-pressure heat supply unit air cooling island and the high-back-pressure heat supply unit steam exhaust device are connected through a first steam exhaust pipe and a first steam exhaust condensate pipe, and the first steam exhaust pipe is connected with the heat supply network condenser through a third steam exhaust pipe;
the adjacent unit comprises an adjacent unit air cooling island and an adjacent unit steam exhaust device, and the adjacent unit air cooling island is connected with the adjacent unit steam exhaust device through a second steam exhaust pipe and a second steam exhaust condensate pipe;
the first steam exhaust pipe is connected with the second steam exhaust pipe through a fourth steam exhaust pipe, the first steam exhaust condensate pipe is connected with the second steam exhaust condensate pipe through a third steam exhaust condensate pipe, the fourth steam exhaust pipe is provided with a first valve, and the third steam exhaust condensate pipe is provided with a second valve;
the first steam exhaust pipe is provided with a third valve, the third valve is positioned at the downstream of the joint of the first steam exhaust pipe and the fourth steam exhaust pipe and at the upstream of the high-back-pressure heat supply unit air cooling island, and the third steam exhaust pipe is provided with a fourth valve;
the method for recovering waste steam and waste heat of the direct air cooling unit comprises the following steps: in the heating period, controlling the third valve to be always in a closed state, and controlling the exhaust steam discharged by the steam discharging device of the high-back-pressure heat supply unit to enter the heat supply network condenser;
the step of controlling the exhaust steam discharged by the steam exhaust device of the high back pressure heat supply unit to enter the heat supply network condenser comprises the following steps: when the power generation load is high and the exhaust steam waste heat cannot be completely cooled by the heat supply network condenser, controlling the first valve and the second valve to be in an open state, dividing exhaust steam discharged by the exhaust steam device of the high-back-pressure heat supply unit into two parts, wherein one part of the exhaust steam enters the heat supply network condenser, the other part of the exhaust steam enters the air cooling island of the adjacent unit through the fourth exhaust steam pipe for cooling, and returning corresponding part of exhaust steam condensate to the exhaust steam device of the high-back-pressure heat supply unit through the third exhaust steam condensate pipe; when the power generation load is low and the waste steam and waste heat can be cooled by the heat supply network condenser, the first valve and the second valve are controlled to be in a closed state, and all the waste steam discharged by the steam discharge device of the high-back-pressure heat supply unit enters the heat supply network condenser.
2. The method for supplying heat by recovering waste heat of exhaust steam of direct air cooling unit as claimed in claim 1, wherein the first exhaust steam pipe is provided with a fifth valve, and the fifth valve is located upstream of the connection of the first exhaust steam pipe and the third exhaust steam pipe.
3. The method for recycling waste heat of exhaust steam of direct air cooling unit as claimed in claim 1, wherein the second exhaust steam pipe is connected to the heat supply network condenser through a fifth exhaust steam pipe, and a sixth valve is disposed between the fifth exhaust steam pipes.
4. The method for recycling and supplying heat of exhaust steam waste heat of the direct air cooling unit according to claim 2 or 3, wherein the second exhaust steam pipe is provided with a seventh valve, and the seventh valve is positioned at the downstream of the connection position of the second exhaust steam pipe and the fourth exhaust steam pipe.
5. The exhaust steam waste heat recovery and heat supply method of the direct air cooling unit according to any one of claims 1 to 3, wherein the fourth exhaust steam pipe is provided with a first flow monitoring device; and the third exhaust steam condensate pipe is provided with a second flow monitoring device.
6. The exhaust steam waste heat recovery and heat supply method of the direct air cooling unit according to claim 1, wherein the exhaust steam waste heat recovery and heat supply method of the direct air cooling unit further comprises: and controlling the opening degrees of the first valve and the second valve to enable the flow of the dead steam in the fourth dead steam pipe to be equal to the flow of the condensate of the dead steam condensate.
7. The direct air cooling unit exhaust steam waste heat recovery heat supply method is characterized in that the direct air cooling unit exhaust steam waste heat recovery heat supply method is implemented based on a direct air cooling unit exhaust steam waste heat recovery heat supply system, and the direct air cooling unit exhaust steam waste heat recovery heat supply system comprises: a heat supply network condenser;
the high-back-pressure heat supply unit comprises a high-back-pressure heat supply unit air cooling island and a high-back-pressure heat supply unit steam exhaust device, the high-back-pressure heat supply unit air cooling island and the high-back-pressure heat supply unit steam exhaust device are connected through a first steam exhaust pipe and a first steam exhaust condensate pipe, and the first steam exhaust pipe is connected with the heat supply network condenser through a third steam exhaust pipe;
the adjacent unit comprises an adjacent unit air cooling island and an adjacent unit steam exhaust device, and the adjacent unit air cooling island is connected with the adjacent unit steam exhaust device through a second steam exhaust pipe and a second steam exhaust condensate pipe;
the first steam exhaust pipe is connected with the second steam exhaust pipe through a fourth steam exhaust pipe, the first steam exhaust condensate pipe is connected with the second steam exhaust condensate pipe through a third steam exhaust condensate pipe, the fourth steam exhaust pipe is provided with a first valve, and the third steam exhaust condensate pipe is provided with a second valve;
the first steam exhaust pipe is provided with a third valve, the third valve is positioned at the downstream of the joint of the first steam exhaust pipe and the fourth steam exhaust pipe and at the upstream of the high-back-pressure heat supply unit air cooling island, and the third steam exhaust pipe is provided with a fourth valve;
the method for recovering waste steam and waste heat of the direct air cooling unit comprises the following steps: in the heating period, controlling the third valve to be always in a closed state, and controlling the exhaust steam discharged by the steam discharging device of the high-back-pressure heat supply unit to enter the heat supply network condenser;
the step of controlling the exhaust steam discharged by the steam exhaust device of the high back pressure heat supply unit to enter the heat supply network condenser comprises the following steps: when the power generation load is high and the exhaust steam waste heat cannot be completely cooled by the heat supply network condenser, controlling the first valve and the second valve to be in an open state, dividing exhaust steam discharged by the exhaust steam device of the high-back-pressure heat supply unit into two parts, wherein one part of the exhaust steam enters the heat supply network condenser, the other part of the exhaust steam enters the air cooling island of the adjacent unit through the fourth exhaust steam pipe for cooling, and returning corresponding part of exhaust steam condensate to the exhaust steam device of the high-back-pressure heat supply unit through the third exhaust steam condensate pipe; when the power generation load is low and the exhaust steam waste heat can be cooled by a heat supply network condenser, controlling the first valve and the second valve to be in a closed state, and enabling all the exhaust steam discharged by the exhaust steam device of the high-back-pressure heat supply unit to enter the heat supply network condenser;
the first steam exhaust pipe is provided with a fifth valve, and the fifth valve is positioned at the upstream of the joint of the first steam exhaust pipe and the third steam exhaust pipe;
the second steam exhaust pipe is provided with a seventh valve, and the seventh valve is positioned at the downstream of the joint of the second steam exhaust pipe and the fourth steam exhaust pipe;
the method for recovering waste steam and waste heat of the direct air cooling unit comprises the following steps: in the heating period, when the high-back-pressure heating unit is in fault shutdown, the first valve and the second valve are controlled to be in an open state, the third valve is controlled to be closed, and the fifth valve is controlled to be closed: the seventh valve is opened, and partial exhaust steam discharged by the steam discharge device of the adjacent unit enters the heat supply network condenser through the fourth exhaust steam pipe; or the seventh valve is closed, and all the exhaust steam discharged by the steam discharge devices of the adjacent units enters the heat supply network condenser through the fourth exhaust steam pipe.
8. The direct air cooling unit exhaust steam waste heat recovery heat supply method is characterized in that the direct air cooling unit exhaust steam waste heat recovery heat supply method is implemented based on a direct air cooling unit exhaust steam waste heat recovery heat supply system, and the direct air cooling unit exhaust steam waste heat recovery heat supply system comprises: a heat supply network condenser;
the high-back-pressure heat supply unit comprises a high-back-pressure heat supply unit air cooling island and a high-back-pressure heat supply unit steam exhaust device, the high-back-pressure heat supply unit air cooling island and the high-back-pressure heat supply unit steam exhaust device are connected through a first steam exhaust pipe and a first steam exhaust condensate pipe, and the first steam exhaust pipe is connected with the heat supply network condenser through a third steam exhaust pipe;
the adjacent unit comprises an adjacent unit air cooling island and an adjacent unit steam exhaust device, and the adjacent unit air cooling island is connected with the adjacent unit steam exhaust device through a second steam exhaust pipe and a second steam exhaust condensate pipe;
the first steam exhaust pipe is connected with the second steam exhaust pipe through a fourth steam exhaust pipe, the first steam exhaust condensate pipe is connected with the second steam exhaust condensate pipe through a third steam exhaust condensate pipe, the fourth steam exhaust pipe is provided with a first valve, and the third steam exhaust condensate pipe is provided with a second valve;
the first steam exhaust pipe is provided with a third valve, the third valve is positioned at the downstream of the joint of the first steam exhaust pipe and the fourth steam exhaust pipe and at the upstream of the high-back-pressure heat supply unit air cooling island, and the third steam exhaust pipe is provided with a fourth valve;
the method for recovering waste steam and waste heat of the direct air cooling unit comprises the following steps: in the heating period, controlling the third valve to be always in a closed state, and controlling the exhaust steam discharged by the steam discharging device of the high-back-pressure heat supply unit to enter the heat supply network condenser;
the step of controlling the exhaust steam discharged by the steam exhaust device of the high back pressure heat supply unit to enter the heat supply network condenser comprises the following steps: when the power generation load is high and the exhaust steam waste heat cannot be completely cooled by the heat supply network condenser, controlling the first valve and the second valve to be in an open state, dividing exhaust steam discharged by the exhaust steam device of the high-back-pressure heat supply unit into two parts, wherein one part of the exhaust steam enters the heat supply network condenser, the other part of the exhaust steam enters the air cooling island of the adjacent unit through the fourth exhaust steam pipe for cooling, and returning corresponding part of exhaust steam condensate to the exhaust steam device of the high-back-pressure heat supply unit through the third exhaust steam condensate pipe; when the power generation load is low and the exhaust steam waste heat can be cooled by a heat supply network condenser, controlling the first valve and the second valve to be in a closed state, and enabling all the exhaust steam discharged by the exhaust steam device of the high-back-pressure heat supply unit to enter the heat supply network condenser;
the second exhaust steam pipe is connected with the heat supply network condenser through a fifth exhaust steam pipe, and a sixth valve is arranged between the fifth exhaust steam pipes;
the second steam exhaust pipe is provided with a seventh valve, and the seventh valve is positioned at the downstream of the joint of the second steam exhaust pipe and the fourth steam exhaust pipe;
the method for recovering waste steam and waste heat of the direct air cooling unit comprises the following steps: in the heating period, when the high-back-pressure heating unit is in a fault shutdown state, the first valve and the second valve are controlled to be in a closed state, the third valve is controlled to be closed, the fourth valve is controlled to be closed, and the sixth valve is controlled to be opened: the seventh valve is opened, and partial exhaust steam discharged by the steam discharge device of the adjacent unit enters the heat supply network condenser through the fifth exhaust steam pipe; or the seventh valve is closed, and all the exhaust steam discharged by the steam discharge devices of the adjacent units enters the heat supply network condenser through the fourth exhaust steam pipe.
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| CN202074601U (en) * | 2011-05-03 | 2011-12-14 | 张丽 | Steam exhausting, waste heat recovering and heating system of direct air cooling unit |
| CN104482579A (en) * | 2014-12-10 | 2015-04-01 | 山东泓奥电力科技有限公司 | Air cooling unit dual pressure circulating water heating system |
| CN205388429U (en) * | 2016-01-08 | 2016-07-20 | 山东泓奥电力科技有限公司 | Air cooling unit high back pressure circulating water supplies heat energy -saving system |
| CN206626980U (en) * | 2017-03-29 | 2017-11-10 | 山东泓奥电力科技有限公司 | Air-cooled Unit high back pressure circulating water heating winterization system |
| CN109578096A (en) * | 2018-07-27 | 2019-04-05 | 华电重工股份有限公司 | A kind of steam turbine high back pressure heat supply power generating simultaneously system |
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2020
- 2020-04-29 CN CN202010358247.6A patent/CN111520792B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202074601U (en) * | 2011-05-03 | 2011-12-14 | 张丽 | Steam exhausting, waste heat recovering and heating system of direct air cooling unit |
| CN104482579A (en) * | 2014-12-10 | 2015-04-01 | 山东泓奥电力科技有限公司 | Air cooling unit dual pressure circulating water heating system |
| CN205388429U (en) * | 2016-01-08 | 2016-07-20 | 山东泓奥电力科技有限公司 | Air cooling unit high back pressure circulating water supplies heat energy -saving system |
| CN206626980U (en) * | 2017-03-29 | 2017-11-10 | 山东泓奥电力科技有限公司 | Air-cooled Unit high back pressure circulating water heating winterization system |
| CN109578096A (en) * | 2018-07-27 | 2019-04-05 | 华电重工股份有限公司 | A kind of steam turbine high back pressure heat supply power generating simultaneously system |
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