CN108302946B - Flue gas waste heat recycling device based on organic Rankine cycle and control system - Google Patents
Flue gas waste heat recycling device based on organic Rankine cycle and control system Download PDFInfo
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- CN108302946B CN108302946B CN201810059999.5A CN201810059999A CN108302946B CN 108302946 B CN108302946 B CN 108302946B CN 201810059999 A CN201810059999 A CN 201810059999A CN 108302946 B CN108302946 B CN 108302946B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0056—Regulation involving cooling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention relates to a flue gas waste heat recycling device and a control system based on organic Rankine cycle, wherein flue type heat exchangers and evaporators are adopted for twice heat exchange, so that flue gas waste heat is indirectly transferred to an organic working medium through water, and the purpose of waste heat recycling is achieved by acting through a turbine; the boiling point of water is increased by pressurizing, and the water is still in a liquid state at the temperature of about 150 ℃; the flow rate of water entering the water channel of the flue type heat exchanger, the temperature of water at the water outlet of the water channel of the flue type heat exchanger and the pressure in the pressure stabilizing water storage container can be controlled to be kept within a certain range through the control system, the smooth operation of the whole device is ensured, the reliability and the high efficiency of waste heat utilization can be ensured, and the continuous stable operation of the original production process is not influenced.
Description
Technical Field
The invention relates to the technical field of waste heat utilization, in particular to a flue gas waste heat recycling device and a control system based on organic Rankine Cycle (ORC for short).
Background
In the process of steel production, a large amount of high-quality active lime is needed, and the rotary kiln calcined active lime has the characteristics of high yield, high quality, high raw material utilization rate and the like, so that the application is wide. The production process of the active lime generates a large amount of low-temperature waste heat which is discharged in a whitish mode, particularly low-temperature smoke discharged from the tail of a kiln and below 250 ℃, the smoke is low in grade, complex in medium and easy to accumulate ash and wear, and the smoke depends on a main production line and cannot be effectively utilized all the time, so that the organic Rankine cycle power generation technology is adopted to fully recover the waste heat of the smoke discharged from the lime kiln, and the method has very important significance for reducing energy consumption of enterprises and improving economic benefits.
However, for the novel low-temperature waste heat recycling technology, the problems of coordination, coupling and control linkage of a plurality of process parameters need to be solved, and an automatic control system with excellent real-time performance, good stability, high reliability and safety needs to be configured to achieve stable operation of the waste heat power generation system and maximize waste heat utilization.
Disclosure of Invention
The invention aims to provide a flue gas waste heat recycling device and a control system based on organic Rankine cycle, which can ensure the reliability and high efficiency of waste heat utilization and do not influence the continuous and stable operation of the original production process.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the flue gas waste heat recycling device based on the organic Rankine cycle mainly comprises a flue type heat exchanger for transferring flue gas waste heat to water, an evaporator for transferring heat energy obtained by the water passing through the flue type heat exchanger to an organic working medium and enabling the organic working medium to be heated and vaporized into steam in an isobaric manner, a turbine for performing adiabatic expansion work on the organic working medium steam passing through the evaporator and outputting work, a condenser for performing isobaric condensation on the organic working medium after the work is performed and a working medium pump for providing power for the organic working medium circulation;
the flue type heat exchanger is characterized in that a flue gas channel for allowing flue gas to pass through and a water channel for supplying water to pass through are arranged inside the flue type heat exchanger, the upper end of the flue gas channel of the flue type heat exchanger is connected with a smoke inlet pipe for inputting flue gas to the flue type heat exchanger, a smoke inlet valve is arranged on the smoke inlet pipe, the lower end of the flue gas channel of the flue type heat exchanger is connected with a smoke outlet pipe for outputting the flue gas in the flue type heat exchanger, the smoke inlet pipe is connected with the smoke outlet pipe through a flue gas bypass pipe, a connection point of the flue gas bypass pipe and the smoke inlet pipe is positioned at the upstream of the smoke inlet valve, a flue gas bypass valve with adjustable opening degree is further arranged on the flue gas bypass pipe, and the flue gas bypass valve is connected with
1-T
2The flue gas heat exchange control system has the temperature T of more than or equal to 135 DEG C
1≤T
2Less than or equal to 155 ℃ (wherein, T
1＜T
2The set value for expressing the water temperature at the water outlet of the water channel of the flue type heat exchanger is more than or equal to T
1Less than or equal to T
2A range of (1), T
1=T
2The set value for expressing the water temperature at the water outlet of the water channel of the flue type heat exchanger is a fixed value, and T is adopted in the invention
1＜T
2Compared with T
1=T
2More resource-saving, v below
1And v
2The situation is similar);
the evaporator is internally provided with a water channel for water to pass and a working medium channel for organic working medium to pass, a water inlet of the water channel of the evaporator is communicated with a water outlet of the water channel of the flue type heat exchanger, a water outlet of the water channel of the evaporator is connected with a closed pressure-stabilizing water storage container, and the pressure-stabilizing water storage container is connected with a pressure regulator for controlling the pressure in the pressure-stabilizing water storage container (which refers to the pressure at any point and is less than 0.01MPa for the pressure generated by the water head difference of 1m, so the pressure generated by the water head difference in the pressure-stabilizing water storage container has little influence on the technical scheme of the
1-P
2The pressure-stabilizing water-replenishing control system has the pressure of not more than 1.2MPa and not more than P
1＜P
2Less than or equal to 1.6MPa, a water feed pump and a water feed valve with adjustable opening degree are arranged between the pressure stabilizing water storage container and the water inlet of the water channel of the flue type heat exchanger, and the water feed valve is connected with a water feed valve which is used for controlling the opening degree of the water feed valve so as to control the flow velocity of water entering the water channel of the flue type heat exchanger to be v
1-v
2Feed water control system of (2), 125m
3/h≤v
1≤v
2≤145m
3/h；
The inlet of the turbine is connected with the outlet of the working medium channel of the evaporator, the inlet of the turbine is provided with a steam inlet valve, the outside of the turbine is provided with a steam bypass pipe for communicating the inlet of the turbine and the outlet of the turbine, the inlet of the steam bypass pipe is positioned at the upstream of the steam inlet valve, and the steam bypass pipe is provided with a steam bypass valve; the turbine outlet is connected with the condenser inlet, and the condenser outlet is connected with the evaporator water channel inlet through the working medium pump.
Preferably, T is 140 ℃. ltoreq.T
1≤T
2≤150℃；1.3MPa≤P
1＜P
2≤1.5MPa；130m
3/h≤v
1≤v
2≤140m
3/h。
Preferably, an organic working medium storage container is arranged between the condenser and the working medium pump.
Preferably, a preheating device for preheating the organic working medium is further arranged between the working medium pump and the working medium channel inlet of the evaporator, the preheating device is a heat exchanger, a water channel for water to pass through and a working medium channel for the organic working medium to pass through are arranged in the preheating device, two ends of the water channel of the preheating device are respectively connected with a water outlet of the water channel of the flue-type heat exchanger and a water inlet of the water channel of the evaporator, and the working medium channel of the preheating device is respectively connected with the working medium pump and the working medium channel inlet of the evaporator; further preferably, a water valve is arranged between the water channel of the preheating device and the water inlet of the water channel of the evaporator; a working medium valve is arranged between the working medium channel of the preheating device and the working medium channel inlet of the evaporator.
Preferably, a smoke outlet valve is arranged on the smoke outlet pipe of the flue type heat exchanger, and the connection point of the smoke by-pass pipe and the smoke outlet pipe is positioned at the downstream of the smoke outlet valve.
The control system of any one of the flue gas waste heat recycling devices comprises a water supply control system, a flue gas heat exchange control system and a pressure stabilizing and water supplementing control system;
the water supply control system takes the flow speed of water entering a water channel of the flue type heat exchanger as an output quantity, and the set value is v
1-v
2The water supply control system detects the actual flow velocity v of water entering the water channel of the flue type heat exchanger through a flow detection device arranged between the water supply valve and the inlet of the water channel of the flue type heat exchanger and feeds the actual flow velocity v back to the water supply controller to form a main feedback channel of the water supply control system, the controller controls the opening degree of the water supply valve if v, and when v is less than v, the controller controls the opening degree of the water supply valve
1When the flow rate of water entering the water channel of the flue type heat exchanger is increased, the opening degree of the water supply valve is controlled to be increased, so that the flow rate of the water entering the water channel of the flue type heat exchanger is increased, and when v is more than v
2When the water flow rate is reduced, the opening degree of the water supply valve is controlled to be reduced, so that the flow rate of water entering a water channel of the flue type heat exchanger is reduced;
the flue gas heat exchange control system takes the temperature of water at a water outlet of a water channel of the flue type heat exchanger as an output quantity, and the set value is T
1-T
2The flue gas heat exchange control system detects the actual temperature T of water at the water outlet of the water channel of the flue heat exchanger through a temperature detection device arranged at the water outlet of the water channel of the flue heat exchanger and feeds the actual temperature T back to the flue gas heat exchange controller to form a main feedback channel of the flue gas heat exchange control system, the flue gas heat exchange controller controls the opening of a flue gas bypass valve if T, and when T is less than T
1When the temperature of water at the water outlet of the water channel of the flue type heat exchanger is higher than T, the opening of the flue gas bypass valve is controlled to be reduced, so that the flow speed of the flue gas entering the flue gas channel of the flue type heat exchanger is increased, and the temperature of the water at the water outlet of the water channel of the flue type heat exchanger is increased when T is larger than T
2When the temperature of the water at the water outlet of the water channel of the flue type heat exchanger is lower than the temperature of the water at the water outlet of the water channel of the flue type heat exchanger, the opening of the flue gas bypass valve is controlled to be increased, so that the flow speed of the flue gas entering the flue type heat exchanger is reduced;
the pressure stabilizing and water supplementing control system takes the pressure in the pressure stabilizing water storage container as an output quantity, and the set value of the pressure stabilizing and water supplementing control system is P
1-P
2The pressure stabilizing water supplement control system detects the actual pressure P in the pressure stabilizing water storage container through a pressure detection device arranged in the pressure stabilizing water storage container and feeds the actual pressure P back to the pressure stabilizing water supplement controller to form a pressure stabilizing water supplement control systemThe main feedback channel of the system is set when P < P
1When the pressure in the pressure stabilizing water storage container rises to P, the pressure stabilizing water supplementing controller controls the water supplementing pump to start to inject water into the pressure stabilizing water storage container
2And controlling the water replenishing pump to stop running.
Preferably, the flue gas heat exchange control system feeds back the flow velocity of water entering the water channel of the flue type heat exchanger as a disturbance quantity to the flue gas heat exchange controller to form a feed-forward channel of the flue gas heat exchange control system.
Preferably, the water replenishing pump of the pressure stabilizing water replenishing control system adopts a redundant arrangement, if the water replenishing pump works abnormally during water replenishing, the standby water replenishing pump is controlled to be started, and the water replenishing pump which works abnormally is controlled to stop running after time delay.
Has the advantages that: the flue type heat exchanger and the evaporator are used for twice heat exchange, so that the waste heat of the flue gas is indirectly transferred to the organic working medium, and the purpose of waste heat recovery and utilization is achieved by acting through a turbine; the boiling point of water is increased by pressurizing, and the water is still in a liquid state at the temperature of about 150 ℃; the flow rate of water entering the water channel of the flue type heat exchanger, the temperature of water at the water outlet of the water channel of the flue type heat exchanger and the pressure in the pressure stabilizing water storage container can be controlled to be kept within a certain range through the control system, the smooth operation of the whole device is ensured, the reliability and the high efficiency of waste heat utilization can be ensured, and the continuous stable operation of the original production process is not influenced.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment (cogeneration) of the flue gas waste heat recycling device of the present invention;
FIG. 2 is a schematic diagram of the organic Rankine cycle portion of FIG. 1;
FIG. 3 is a schematic diagram of the control system of the whole production line and the cogeneration device;
FIG. 4 is a schematic diagram of a control system configuration;
FIG. 5 is a schematic control diagram of the feedwater control system;
FIG. 6 is a schematic control principle diagram of a flue gas heat exchange control system;
FIG. 7 is a schematic diagram of the control principle of the pressure stabilizing water replenishing control system;
the labels in the figure are: 1. the system comprises a flue gas bypass valve, 2, a smoke inlet valve, 3, a flue type heat exchanger, 4, a smoke outlet valve, 5, an evaporator, 6, a pressure stabilizing and water supplementing control system, 7, a pressure stabilizing water storage container, 8, a water feed pump, 9, a water feed valve, 10, a turbine, 11, a cooler, 12, an organic working medium storage container, 13, a working medium pump, 14, a generator, 15, a cooling fan, 16, a cooling tower, 17, a cooling water circulating pump, 18, an steam inlet valve, 19, a steam bypass valve, 20, a preheater, 21, a working medium valve, 22, a water valve, 23, a grid-connected cabinet, 24, an engineer station, 25, an operator station, 26, a printer, 27, an operation level network, 28, a controller, 29, process control level network equipment, 30 and a remote IO station.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, the prior art and a specific embodiment of the present invention, and the prior art is used in the non-detailed parts of the following embodiments.
Example 1
As shown in fig. 1-2, a lime kiln flue gas waste heat power generation device based on organic rankine cycle mainly comprises a flue heat exchanger 3 for transferring flue gas waste heat to water, an evaporator 5 for transferring heat energy obtained by water passing through the flue heat exchanger 3 to an organic working medium and isobaric heating and vaporizing the organic working medium into steam, a turbine 10 for adiabatically expanding the organic working medium steam passing through the evaporator 5 to do work and outputting the work to a generator 14 (or directly driving other mechanical equipment to recycle), a condenser 11 for isobaric condensing the organic working medium after doing work and a working medium pump 13 for providing power for organic working medium circulation;
the flue type heat exchanger 3 is internally provided with a flue gas channel for flue gas to pass through and a water channel for water to pass through, the upper end of the flue gas channel of the flue type heat exchanger 3 is connected with a smoke inlet pipe for inputting flue gas to the flue type heat exchanger 3, the smoke inlet pipe is provided with a smoke inlet valve 2, the lower end of the flue gas channel of the flue type heat exchanger 3 is connected with a smoke outlet pipe for outputting the flue gas in the flue type heat exchanger 3, the smoke outlet pipe of the flue type heat exchanger 3 is provided with a smoke outlet valve 4, and the smoke inlet pipe and the smoke outlet pipe pass throughThe flue gas by-pass pipe is connected, the connection point of the flue gas by-pass pipe and the smoke inlet pipe is positioned at the upstream of the smoke inlet valve 2, the connection point of the flue gas by-pass pipe and the smoke outlet pipe is positioned at the downstream of the smoke outlet valve 4, the flue gas by-pass pipe is also provided with a flue gas bypass valve 1 with adjustable opening, the flue gas bypass valve 1 is connected with a water outlet water temperature control valve used for controlling the opening of the flue gas bypass valve 1 so as to control the flue gas flow velocity entering the flue gas channel and further control the water temperature of
1=140℃，T
2A flue gas heat exchange control system at the temperature of not less than 150 ℃;
the inside of the evaporator 5 is provided with a water channel for water to pass through and a working medium channel for organic working medium to pass through, the water inlet of the water channel of the evaporator 5 is communicated with the water outlet of the water channel of the flue type heat exchanger 3, the water outlet of the water channel of the evaporator 5 is connected with a closed pressure-stabilizing water storage container 7 (pressure-stabilizing tank), and the pressure-stabilizing water storage container 7 is connected with a device for controlling the pressure inside the pressure-stabilizing water storage container 7 to be 1.3MPa-1.5MPa (namely P
1=1.3MPa，P
2=1.5 MPa), a water feed pump 8 and a water feed valve 9 with adjustable opening are arranged between the pressure-stabilizing water storage container 7 and the water inlet of the water channel of the flue-type heat exchanger 3, and the water feed valve 9 is connected with a water feed valve 9 which is used for controlling the opening of the water feed valve 9 so as to control the flow velocity of water entering the water channel of the flue-type heat exchanger 3 to be 130m
3/h-140m
3H (i.e., v)
1=130m
3/h，v
2=140m
3A feed water control system of/h);
an inlet of the turbine 10 is connected with an outlet of a working medium channel of the evaporator 5, an inlet of the turbine 10 is provided with a steam inlet valve 18, a steam bypass pipe for communicating the inlet of the turbine 10 with an outlet of the turbine 10 is arranged outside the turbine 10, an inlet of the steam bypass pipe is positioned at the upstream of the steam inlet valve 18, and a steam bypass valve 19 is arranged on the steam bypass pipe; the power output end of the turbine 10 is connected with a generator 14, the generator 14 is connected with a grid-connected cabinet 23, and power is supplied to the outside through the grid-connected cabinet 23; the outlet of the turbine 10 is connected with the inlet of a condenser 11, and the outlet of the condenser 11 is connected with the inlet of a water channel of the evaporator 5 through a working medium pump 13;
an organic working medium storage container 12 is arranged between the condenser 11 and the working medium pump 13;
a preheating device 20 for preheating an organic working medium is further arranged between the working medium pump 13 and the working medium channel inlet of the evaporator 5, the preheating device 20 is a heat exchanger, a water channel for water to pass through and a working medium channel for organic working medium to pass through are arranged in the preheating device 20, two ends of the water channel of the preheating device 20 are respectively connected with the water channel water outlet of the flue-type heat exchanger 3 and the water channel water inlet of the evaporator 5, and the working medium channel of the preheating device 20 is respectively connected with the working medium pump 13 and the working medium channel inlet of the evaporator 5; a water valve 22 is arranged between the water channel of the preheating device 20 and the water inlet of the water channel of the evaporator 5; a working medium valve 21 is arranged between the working medium channel of the preheating device 20 and the working medium channel inlet of the evaporator 5.
Example 2
A control system of a flue gas waste heat power generation device as described in embodiment 1, which includes a water supply control system, a flue gas heat exchange control system, a pressure stabilizing and water supplementing control system, an ORC generator set control system and a circulating cooling water control system, these systems share a set of operation stations (including an engineer station and an operator station) with a lime kiln production line, and have respective site (process) control stations, and these site control stations are all connected with the operation stations through an ethernet network;
the ORC generator set control system and the circulating cooling water control system control various thermal parameters of a turbine, a generator, an evaporator, a preheater, a condenser and the like in the organic Rankine cycle and the operation of a circulating water pump and a cooling tower; the water supply control station controls the water supply flow entering the flue type heat exchanger; the flue gas heat exchange control station controls the flow of flue gas entering the flue type heat exchanger; the pressure stabilizing and water supplementing control station controls the pressure of the whole pipeline and supplements water timely;
the water supply control system takes the flow speed of water entering a water channel of the flue type heat exchanger 3 as an output quantity, and the set value of the water supply control system is 130m
3/h-140m
3The feed water control system detects the actual flow velocity v of water entering the water channel of the flue type heat exchanger 3 through a flow detection device arranged between the feed water valve 9 and the inlet of the water channel of the flue type heat exchanger 3 and feeds the actual flow velocity v back to the feed water controller to form a main feedback channel of the feed water control system, and the controller controls the opening degree of the feed water valve 9 for example, when v is less than 130m
3At time/h, the opening of the water feed valve 9 is controlled to increase so thatThe flow speed of water entering the water channel of the flue type heat exchanger 3 is increased when v is more than 140m
3When the water flow rate is increased, the opening degree of the water supply valve 9 is controlled to be increased, so that the flow rate of water entering a water channel of the flue type heat exchanger 3 is increased; the flow detection device adopts a PDS483 differential pressure transmitter to transmit the physical signal acquired by the primary flow element into a 4-20mA current signal, and then the current signal is converted into a final flow value through a flow calculation module of the DCS. The control system changes the set opening value of the water supply electric valve according to the measured flow value, thereby maintaining the water amount entering the flue type heat exchanger at 130m
3/h-140m
3H; the water supply valves 9 adopt a 1:1 redundant configuration (namely two water supply valves 9 are adopted for one use and one standby);
the flue gas heat exchange control system takes the temperature of water at the water outlet of the water channel of the flue type heat exchanger 3 as output quantity, the set value is 140-150 ℃, the flue gas heat exchange control system detects the actual temperature T of the water at the water outlet of the water channel of the flue type heat exchanger 3 through a temperature detection device arranged at the water outlet of the water channel of the flue type heat exchanger 3 and feeds the actual temperature T back to the flue gas heat exchange controller to form a main feedback channel of the flue gas heat exchange control system, the flue gas heat exchange control system feeds the flow velocity of the water entering the water channel of the flue type heat exchanger 3 as disturbance quantity to the flue gas heat exchange controller to form a feedforward channel of the flue gas heat exchange control system, the flue gas heat exchange controller controls the opening of the flue gas bypass valve 1 according to the actual temperature T and the actual flow velocity v, when the T is less than 140 ℃, the opening of the flue, the temperature of water at the water outlet of the water channel of the flue type heat exchanger 3 is further increased, and when T is more than 150 ℃, the opening of the flue gas bypass valve 1 is controlled to be increased, so that the flow speed of flue gas entering the flue gas channel of the flue type heat exchanger 3 is reduced, and the temperature of the water at the water outlet of the water channel of the flue type heat exchanger 3 is further reduced; the temperature detection device adopts WRGPK armored platinum thermal resistor to measure water temperature, the thermal resistor signal is led into a temperature transmitter in a remote IO station cabinet through a three-wire system cable, and a 4-20mA current signal output by the transmitter is connected to an analog quantity output module to complete a data acquisition function
The pressure stabilizing water replenishing control system takes the pressure in the pressure stabilizing water storage container 7 as an output quantity, the set value is 1.3MPa-1.5MPa, the pressure stabilizing water replenishing control system detects the actual pressure P in the pressure stabilizing water storage container 7 through a pressure detection device arranged in the pressure stabilizing water storage container 7 and feeds the actual pressure P back to the pressure stabilizing water replenishing controller to form a main feedback channel of the pressure stabilizing water replenishing control system, when the pressure P is less than 1.3MPa, the pressure stabilizing water replenishing controller controls a water replenishing pump to start to replenish water into the pressure stabilizing water storage container 7, and when the pressure in the pressure stabilizing water storage container 7 is increased to 1.5MPa, the water replenishing pump is controlled to stop running; the pressure intensity detection device is a high-precision transmitter (the range is 0.6MPa-1.6 MPa); the pressure stabilizing and water supplementing control system adopts a PID closed loop regulating circuit to realize a control function, adopts a high-precision transmitter (with the range of 0.6MPa-1.6 MPa) to detect signals, and outputs the signals to control a special frequency converter for an ABB 510 water pump, so that the pressure of a pressure stabilizing tank is stabilized at 1.3MPa-1.5 MPa; when the control system normally operates, the water replenishing pumps intermittently operate, and two water replenishing pumps are adopted for one use and one standby; when water is first supplemented to the system, three water supplementing pumps can be added to operate simultaneously.
The above examples are merely illustrative of the embodiments of the present invention, and the embodiments of the present invention are not limited to the above examples, and any modifications and substitutions made without changing the basic concept of the present invention should be included in the scope of the present invention.
Claims (6)
1. The utility model provides a flue gas waste heat recovery utilizes control system of device which characterized in that: the system comprises a water supply control system, a flue gas heat exchange control system and a pressure-stabilizing water supplement control system;
the flue gas waste heat recycling device is based on organic Rankine cycle and mainly comprises a flue type heat exchanger (3) for transferring flue gas waste heat to water, an evaporator (5) for transferring heat energy obtained by water passing through the flue type heat exchanger (3) to an organic working medium and enabling the organic working medium to be heated and vaporized into steam in an isobaric manner, a turbine (10) for performing adiabatic expansion work on the organic working medium steam passing through the evaporator (5) and outputting the work, a condenser (11) for performing isobaric condensation on the organic working medium after the work is performed and a working medium pump (13) for providing power for the organic working medium to circulate;
a flue gas channel for flue gas to pass through and a water channel for water to pass through are arranged inside the flue type heat exchanger (3), the upper end of the flue gas channel of the flue type heat exchanger (3) is connected with a smoke inlet pipe for inputting flue gas to the flue type heat exchanger (3), a smoke inlet valve (2) is arranged on the smoke inlet pipe, the lower end of the flue gas channel of the flue type heat exchanger (3) is connected with a smoke outlet pipe for outputting the flue gas in the flue type heat exchanger (3), the smoke inlet pipe is connected with the smoke outlet pipe through a flue gas bypass pipe, the connection point of the flue gas bypass pipe and the smoke inlet pipe is positioned at the upstream of the smoke inlet valve (2), a flue gas bypass valve (1) with adjustable opening degree is, the flue gas bypass valve (1) is connected with a water outlet of a water channel of the flue type heat exchanger (3) and is used for controlling the opening of the flue gas bypass valve (1), thereby controlling the flow rate of flue gas entering the flue gas channel and further controlling the water temperature of the water channel to be T.
1-T
2Flue gas heat exchange control system, T
1=140℃，T
2=150℃；
The inside of evaporimeter (5) is equipped with the water passageway that is used for supplying water to pass through and is used for supplying the working medium passageway that organic working medium passes through, and evaporimeter (5) water passageway water inlet is linked together with flue heat exchanger (3) water passageway delivery port, and evaporimeter (5) water passageway delivery port is connected with inclosed steady voltage water storage container (7), and steady voltage water storage container (7) are connected with and are used for controlling pressure in steady voltage water storage container (7) to be P
1-P
2Pressure-stabilizing water-replenishing control system, P
1=1.3MPa，P
2=1.5MPa, a water feed pump (8) and a water feed valve (9) with adjustable opening degree are arranged between the pressure-stabilizing water storage container (7) and the water inlet of the water channel of the flue type heat exchanger (3), the water feed valve (9) is connected with a water feed valve (9) which is used for controlling the opening degree of the water feed valve (9) so as to control the flow velocity of water entering the water channel of the flue type heat exchanger (3) to be v
1-v
2Feed water control system of v
1=130m
3/h，v
2=140m
3/h；
An inlet of the turbine (10) is connected with an outlet of a working medium channel of the evaporator (5), an inlet of the turbine (10) is provided with a steam inlet valve (18), a steam bypass pipe for communicating the inlet of the turbine (10) with an outlet of the turbine (10) is arranged outside the turbine (10), an inlet of the steam bypass pipe is positioned at the upstream of the steam inlet valve (18), and a steam bypass valve (19) is arranged on the steam bypass pipe; the outlet of the turbine (10) is connected with the inlet of a condenser (11), and the outlet of the condenser (11) is connected with the inlet of a water channel of the evaporator (5) through a working medium pump (13); a preheating device (20) used for preheating organic working media is further arranged between the working medium pump (13) and the working medium channel inlet of the evaporator (5), the preheating device (20) is a heat exchanger, a water channel used for water supply to pass through and a working medium channel used for organic working media to pass through are arranged in the preheating device (20), two ends of the water channel of the preheating device (20) are respectively connected with the water channel water outlet of the flue-type heat exchanger (3) and the water channel water inlet of the evaporator (5), and the working medium channel of the preheating device (20) is respectively connected with the working medium pump (13) and the working medium channel inlet of the evaporator (5);
the water supply control system takes the flow speed of water entering a water channel of the flue type heat exchanger (3) as an output quantity, and the set value is v
1-v
2The water supply control system detects the actual flow velocity v of water entering the water channel of the flue type heat exchanger (3) through a flow detection device arranged between a water supply valve (9) and the inlet of the water channel of the flue type heat exchanger (3) and feeds the actual flow velocity v back to the water supply controller to form a main feedback channel of the water supply control system, the controller controls the opening degree of the water supply valve (9) if v, and when v is less than v
1When the flow rate of water entering the water channel of the flue type heat exchanger (3) is increased, the opening degree of the water supply valve (9) is controlled to be increased, and when v is more than v
2When the water flow rate is increased, the opening degree of the water supply valve (9) is controlled to be increased, so that the flow rate of water entering a water channel of the flue type heat exchanger (3) is increased;
the flue gas heat exchange control system takes the temperature of water at a water outlet of a water channel of the flue type heat exchanger (3) as an output quantity, and the set value is T
1-T
2The flue gas heat exchange control system detects the actual temperature T of water at the water outlet of the water channel of the flue heat exchanger (3) through a temperature detection device arranged at the water outlet of the water channel of the flue heat exchanger (3) and feeds the actual temperature T back to the flue gas heat exchange controller to form a main feedback channel of the flue gas heat exchange control system, the flue gas heat exchange controller controls the opening of the flue gas bypass valve (1) according to the T, and when the T is less than the T, the flue gas heat exchange controller controls the opening of the
1While controlling the smokeThe opening degree of the gas bypass valve (1) is reduced, so that the flow speed of the flue gas entering the flue gas channel of the flue type heat exchanger (3) is increased, the temperature of water at the water outlet of the water channel of the flue type heat exchanger (3) is increased, and when T is more than T
2When the temperature of the water at the water outlet of the water channel of the flue type heat exchanger (3) is reduced, the opening of the flue gas bypass valve (1) is controlled to be increased, so that the flow speed of the flue gas entering the flue type heat exchanger (3) is reduced, and the temperature of the water at the water outlet of the water channel of the flue type heat exchanger (3) is reduced;
the pressure stabilizing water replenishing control system takes the pressure in the pressure stabilizing water storage container (7) as an output quantity, and the set value is P
1-P
2The pressure stabilizing water supplement control system detects the actual pressure P in the pressure stabilizing water storage container (7) through a pressure detection device arranged in the pressure stabilizing water storage container (7) and feeds the actual pressure P back to the pressure stabilizing water supplement controller to form a main feedback channel of the pressure stabilizing water supplement control system, and when P is less than P
1When the pressure in the pressure stabilizing water storage container (7) rises to P, the pressure stabilizing water supplementing controller controls the water supplementing pump to start to fill water into the pressure stabilizing water storage container (7)
2And controlling the water replenishing pump to stop running.
2. The control system of the flue gas waste heat recovery device according to claim 1, characterized in that: an organic working medium storage container (12) is arranged between the condenser (11) and the working medium pump (13).
3. The control system of the flue gas waste heat recovery device according to claim 1, characterized in that: a water valve (22) is arranged between the water channel of the preheating device (20) and the water inlet of the water channel of the evaporator (5); a working medium valve (21) is arranged between the working medium channel of the preheating device (20) and the working medium channel inlet of the evaporator (5).
4. The control system of the flue gas waste heat recovery device according to claim 1, characterized in that: a smoke outlet valve (4) is arranged on the smoke outlet pipe of the flue type heat exchanger (3), and the connection point of the smoke by-pass pipe and the smoke outlet pipe is positioned at the downstream of the smoke outlet valve (4).
5. The control system of the flue gas waste heat recovery device according to claim 1, characterized in that: the flue gas heat exchange control system feeds the flow velocity of water entering a water channel of the flue type heat exchanger (3) as a disturbance quantity back to the flue gas heat exchange controller to form a feed-forward channel of the flue gas heat exchange control system.
6. The control system of the flue gas waste heat recovery device according to claim 1, characterized in that: the water replenishing pump of the pressure-stabilizing water replenishing control system adopts redundancy arrangement, if the water replenishing pump works abnormally during water replenishing, the standby water replenishing pump is controlled to be started, and the water replenishing pump which works abnormally is controlled to stop running after time delay.
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| CN109505667A (en) * | 2018-12-26 | 2019-03-22 | 华电郑州机械设计研究院有限公司 | A kind of single shaft four-in-one ORC machine waste heat recovery group device |
| US11236735B1 (en) | 2021-04-02 | 2022-02-01 | Ice Thermal Harvesting, Llc | Methods for generating geothermal power in an organic Rankine cycle operation during hydrocarbon production based on wellhead fluid temperature |
| US11480074B1 (en) | 2021-04-02 | 2022-10-25 | Ice Thermal Harvesting, Llc | Systems and methods utilizing gas temperature as a power source |
| US11592009B2 (en) | 2021-04-02 | 2023-02-28 | Ice Thermal Harvesting, Llc | Systems and methods for generation of electrical power at a drilling rig |
| US11293414B1 (en) | 2021-04-02 | 2022-04-05 | Ice Thermal Harvesting, Llc | Systems and methods for generation of electrical power in an organic rankine cycle operation |
| US11493029B2 (en) | 2021-04-02 | 2022-11-08 | Ice Thermal Harvesting, Llc | Systems and methods for generation of electrical power at a drilling rig |
| US11359576B1 (en) | 2021-04-02 | 2022-06-14 | Ice Thermal Harvesting, Llc | Systems and methods utilizing gas temperature as a power source |
| US11486370B2 (en) | 2021-04-02 | 2022-11-01 | Ice Thermal Harvesting, Llc | Modular mobile heat generation unit for generation of geothermal power in organic Rankine cycle operations |
| US11421663B1 (en) | 2021-04-02 | 2022-08-23 | Ice Thermal Harvesting, Llc | Systems and methods for generation of electrical power in an organic Rankine cycle operation |
| US11644015B2 (en) | 2021-04-02 | 2023-05-09 | Ice Thermal Harvesting, Llc | Systems and methods for generation of electrical power at a drilling rig |
| CA3214232A1 (en) * | 2021-04-02 | 2022-10-06 | Adrian Benjamin Bodishbaugh | Systems and methods utilizing gas temperature as a power source |
| TWI769837B (en) * | 2021-05-28 | 2022-07-01 | 國立勤益科技大學 | Waste heat recovery system and control method thereof |
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