CN111397395A - Gas source control method for energy-saving mixing of high-temperature high-pressure steam for industrial steam supply - Google Patents
Gas source control method for energy-saving mixing of high-temperature high-pressure steam for industrial steam supply Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C3/00—Other direct-contact heat-exchange apparatus
- F28C3/02—Other direct-contact heat-exchange apparatus the heat-exchange media both being gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/10—Mixing gases with gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/06—Pipe-line systems for gases or vapours for steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
- F22G5/123—Water injection apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
- B01F35/211—Measuring of the operational parameters
- B01F35/2113—Pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
- B01F35/211—Measuring of the operational parameters
- B01F35/2115—Temperature
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Abstract
The invention discloses an air source control method for energy-saving mixing of high-temperature and high-pressure steam for industrial steam supply, which comprises mixing equipment, wherein the mixing equipment comprises a first adjusting valve, a second adjusting valve, an adjustable actuator, a steam ejector, a pressure transmitter, a temperature transmitter and a steam mixing header; the steam ejector is provided with three connecting ports, the three connecting ports comprise a first connecting port, a second connecting port and a discharge port, the first connecting port is connected with a main steam conveying pipe, the second connecting port is connected with the output end of a steam mixing header, the discharge port is connected with a steam supply main pipe, and a pressure transmitter and a temperature transmitter are sequentially connected to the steam supply main pipe.
Description
Technical Field
The invention relates to the technical field of high-temperature high-pressure steam energy-saving mixing, in particular to an air source control method for high-temperature high-pressure steam energy-saving mixing for industrial steam supply.
Background
With the continuous development of national economy of China, industrial heat demand is vigorous, the domestic industrial heat demand accounts for about 70% of the total heat demand, the national industrial heat supply has the phenomena of relatively lagged production process, unreasonable industrial structure and the like, and the unit energy consumption of main industrial products is about 30% higher than the international advanced level on average. In the past, various small boiler heating modes not only waste energy, but also cause serious environmental pollution. The mode of adopting a large unit with high parameters, low coal consumption and low emission to carry out centralized heat supply is an important development direction in the future. With the continuous transformation and upgrading of the industry in China, the demands for heat supply quantity and quality are continuously improved. At present, the demand for industrial steam is more and more diversified, the number of users of medium and high pressure steam is obviously increased, more and more users with the pressure of about 5MPa and the temperature of above 400 ℃ are available, and even industrial steam users with the demand parameters of 10MPa and 500 ℃ are available. Under the large background of advocating environmental protection, energy conservation and emission reduction, how to provide industrial steam with higher pressure and temperature provides new challenges for industrial heating departments.
There are two conventional industrial heating schemes: selecting a certain steam source to match with a temperature and pressure reduction device to obtain steam with required parameters; and (II) taking high-parameter steam as a power steam source, pumping low-pressure steam through a pressure matcher, and mixing to obtain steam with required parameters from an outlet. The drawbacks of conventional heating schemes for current user demand of high parameter steam are:
(1) in order to meet the requirements, high-pressure high-temperature steam such as main steam or 1 extraction steam needs to be selected, and the loss of available energy is large after temperature and pressure reduction, so that the steam consumption cost of a user is increased;
(2) the pressure difference between the front valve and the rear valve of the pressure reducing valve is large, so that the service life of the valve is short;
(3) there is currently no way to find a suitable source of pumped low pressure steam. The use of cold re-steam alone can be problematic in that it is not pumped enough or results in a lower temperature of the mixed steam.
From the above, we have designed an air source control method for energy-saving mixing of high-temperature high-pressure steam for industrial steam supply to solve the above problems.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an air source control method for energy-saving mixing of high-temperature and high-pressure steam for industrial steam supply.
In order to achieve the purpose, the invention adopts the following technical scheme:
a gas source control method for energy-saving mixing of high-temperature and high-pressure steam for industrial steam supply comprises mixing equipment, wherein the mixing equipment comprises a first adjusting valve, a second adjusting valve, an adjustable actuator, a steam ejector, a pressure transmitter, a temperature transmitter and a steam mixing header;
the steam ejector is provided with three connecting ports, the three connecting ports comprise a first connecting port, a second connecting port and an exhaust port, the first connecting port is connected with a main steam conveying pipe, the second connecting port is connected with the output end of the steam mixing header, the exhaust port is connected with a steam supply main pipe, the steam supply main pipe is sequentially connected with a pressure transmitter and a temperature transmitter, the input end of the steam mixing header is connected with a reheat steam cold section and a reheat steam hot section, the first regulating valve is arranged on the reheat steam hot section at one end of the steam mixing header, the second adjusting valve is arranged on a reheated steam cold section at one end of the steam mixing header, a second control unit is arranged between the first adjusting valve and the temperature transmitter, the second adjusting valve and the temperature transmitter, and a temperature reducing water device is connected between the temperature transmitter and the discharge port of the steam ejector, and a first control unit is connected between the pressure transmitter and the adjustable actuator. The first adjusting valve and the second adjusting valve are respectively a hot readjusting valve and a cold readjusting valve;
an air source control method for energy-saving mixing of high-temperature high-pressure steam for industrial steam supply comprises the following steps:
s1, injecting cold/hot remixed steam from the steam mixing header by taking the main steam as power steam, and mixing the cold/hot remixed steam through an injector;
s2, in the mixing process of the step S1, after the pressure at the outlet of the ejector is stabilized at the value required by the user, the pressure enters a steam supply main pipe from the outlet of the ejector, the temperature signal of a transmitter at the outlet is used as a feedback signal, and the opening degrees of a first regulating valve and a second regulating valve on a reheating steam cold section and a reheating steam hot section are regulated through a second control unit, wherein:
when the steam temperature rises, the temperature transmitter at the outlet of the ejector transmits a temperature signal to the second control unit, then the second control unit sends an instruction, the opening of the regulating valve on the pipeline of the cold section of the reheat steam is opened to increase the flow of the cold reheat steam, and the opening of the regulating valve on the pipeline of the hot section of the reheat steam is closed to increase the cold reheat flow of the cold/hot reheat mixed steam, reduce the hot reheat flow and ensure that the temperature at the outlet of the ejector is maintained at a required value;
when the steam temperature is reduced, the temperature transmitter at the outlet of the ejector transmits a temperature signal to the second control unit, then the second control unit sends an instruction, the opening of the regulating valve on the pipeline of the hot section of the reheat steam is opened at first, the flow of the hot reheat steam is increased, and then the opening of the regulating valve on the pipeline of the cold section of the reheat steam is closed, so that the hot reheat flow in the cold/hot remixed steam is increased, the cold reheat flow is reduced, and the temperature at the outlet of the ejector is ensured to be maintained at a required value.
S3, in step S2, when the second control unit adjusts the opening degrees of the first and second control valves in the cold stage of the reheat steam and the hot stage of the reheat steam, the temperature of the heat steam is preferentially adjusted by using the cold readjustment valve.
And S4, in the step S3, the mixed steam enters a steam supply main pipe through an outlet of the ejector after temperature adjustment and is supplied to a user, wherein when the temperature of the heat supply steam exceeds an alarm value and the cold readjustment door is fully opened or is larger than a certain opening degree, the temperature-reducing water adjusting valve participates in steam temperature adjustment, and after the steam temperature returns to a normal value, the temperature-reducing water adjusting valve is automatically closed.
Preferably, the second control unit is a temperature control unit.
Preferably, the temperature control of the heating steam is mainly controlled by a first regulating valve and a second regulating valve together, the temperature reducing device is a standby temperature regulating means, and the outlet of the ejector is in a full-closed state when the temperature is not exceeded.
Preferably, in step S3, the second control unit adjusts the opening degrees of the first and second control valves in the reheat steam cold stage and the reheat steam hot stage, and if the control valve in the cold reheat pipeline has been opened to the maximum opening degree and the control valve in the hot reheat pipeline has been closed to the minimum opening degree, the outlet of the ejector is still over-heated, and at this time, the second control unit is put into a desuperheating device at the outlet of the ejector to lower the steam temperature to a required value.
Preferably, in the valve adjusting range of the cold readjusting valve in the step S3, the hot readjusting valve is opened in a minimum manner; when the cold readjustment valve is fully opened, the hot readjustment valve participates in temperature control.
Preferably, the heating steam pressure is controlled by an adjustable steam injector actuator.
Compared with the prior art, the invention has the beneficial effects that:
the method adopts accurate and efficient control logic, accurately controls the flow of cold re-steam, hot re-steam and desuperheating water, realizes the maximization of cold re-flow, adopts a proportioning mode that the hot re-flow is as small as possible, meets the requirements of users, and realizes energy conservation and consumption reduction.
Drawings
FIG. 1 is a schematic structural diagram of an air source control method for energy-saving mixing of high-temperature high-pressure steam for industrial steam supply according to the present invention;
FIG. 2 is a flow chart of the operation of a first control unit, namely a pressure control unit, of the gas source control method for energy-saving mixing of high-temperature high-pressure steam for industrial steam supply according to the present invention;
FIG. 3 is a flowchart of the second control unit, namely the temperature control unit, of the air source control method for energy-saving mixing of high-temperature high-pressure steam for industrial steam supply according to the present invention;
FIG. 4 is a flow chart of the first adjusting valve control of the air source control method for energy-saving mixing of high-temperature high-pressure steam for industrial steam supply according to the present invention;
FIG. 5 is a flow chart of the second adjusting valve control of the air source control method for energy-saving mixing of high-temperature high-pressure steam for industrial steam supply according to the present invention;
FIG. 6 is a flow chart of the operation of the desuperheating water device of the air source control method for energy-saving mixing of high-temperature high-pressure steam for industrial steam supply provided by the invention;
FIG. 7 is a flow chart of the working flow of the hot steam pressure control of the air source control method of the energy-saving mixing of high-temperature high-pressure steam for industrial steam supply provided by the invention.
In the figure: the system comprises a first temperature regulating valve 1, a second temperature regulating valve 2, an adjustable actuator 3, a steam ejector 4, a pressure transmitter 5, a temperature transmitter 6, a steam mixing header 7, a first control unit 8, a second control unit 9, a temperature reducing water device 10 and a temperature reducing water regulating valve 11.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-7, an air source control method for energy-saving mixing of high-temperature high-pressure steam for industrial steam supply comprises a mixing device, wherein the mixing device comprises a first adjusting valve 1, a second adjusting valve 2, an adjustable actuator 3, a steam ejector 4, a pressure transmitter 5, a temperature transmitter 6 and a steam mixing header 7;
the steam ejector 4 is provided with three connectors, the three connectors comprise a first connector, a second connector and a discharge port, the first connector is connected with a main steam conveying pipe, the second connector is connected with the output end of a steam mixing header 7, the discharge port is connected with a steam supply main pipe, the steam supply main pipe is sequentially connected with a pressure transmitter 5 and a temperature transmitter 6, the input end of the steam mixing header 7 is connected with a reheat steam cold section and a reheat steam hot section, a first regulating valve 1 is arranged on the reheat steam hot section at one end of the steam mixing header 7, a second regulating valve 2 is arranged on the reheat steam cold section at one end of the steam mixing header 7, a second control unit 9 is arranged between the first regulating valve 1 and the second regulating valve 2 and the temperature transmitter 6, a temperature reducing water device 10 is connected between the temperature transmitter 6 and the discharge port of the steam ejector 4, and a first control unit 8 is connected between the pressure transmitter 5 and an adjustable actuator 3, the first and second trim valves 1 and 2 are hot and cold trim valves, respectively.
Example one
An air source control method for energy-saving mixing of high-temperature high-pressure steam for industrial steam supply comprises the following steps:
s1, injecting cold/hot remixed steam from the steam mixing header 7 by taking main steam as power steam, and mixing the cold/hot remixed steam through the ejector 4;
s2, in the mixing process of step S1, after the pressure at the outlet of the injector 4 is stabilized at the value required by the user, the pressure enters the steam supply main pipe from the outlet of the injector 4, the temperature signal of the transmitter 6 at the outlet is used as a feedback signal, and the opening degrees of the first regulating valve 1 and the second regulating valve 2 at the cold section and the hot section of the reheat steam are adjusted by the second control unit 9, wherein:
when the steam temperature rises, the temperature transmitter 6 at the outlet of the ejector 4 transmits a temperature signal to the second control unit 9, then the second control unit 9 sends an instruction, firstly, the opening of the regulating valve 2 on the pipeline of the cold section of the reheat steam is opened to increase the flow of the cold reheat steam, and then, the opening of the regulating valve 1 on the pipeline of the hot section of the reheat steam is closed to increase the cold reheat flow of the cold/hot reheat mixed steam, reduce the hot reheat flow and ensure that the outlet temperature of the ejector 4 is maintained at a required value;
when the steam temperature is reduced, the temperature transmitter 6 at the outlet of the ejector 4 transmits a temperature signal to the second control unit 9, then the second control unit 9 sends an instruction, firstly, the opening of the regulating valve 1 on the pipeline of the hot section of the reheat steam is opened to increase the flow of the hot reheat steam, and then, the opening of the regulating valve 2 on the pipeline of the cold section of the reheat steam is closed to increase the hot reheat flow in the cold/hot reheat mixed steam, reduce the cold reheat flow and ensure that the outlet temperature of the ejector 4 is maintained at a required value;
the steam quantities of the reheating steam cold section and the reheating steam hot section which enter the steam mixing header 7 are respectively regulated through the first regulating valve 1 and the second regulating valve 2, so that the steam temperature in the steam mixing header 7 can be regulated, and the temperature of the mixed steam at the outlet of the steam ejector 4 is changed;
s3, in step S2, when the second control unit 9 adjusts the opening degrees of the first and second control valves 1 and 2 in the cold stage of the reheat steam and the hot stage of the reheat steam, the temperature of the heat supply steam is preferentially adjusted by using the cold readjustment valve.
S4, in the step S3, the mixed steam enters a steam supply main pipe through an outlet of the ejector 4 after temperature adjustment and is supplied to a user, wherein when the temperature of the heat supply steam exceeds an alarm value and the cold re-adjusting valve is fully opened or is larger than a certain opening degree, the temperature-reducing water adjusting valve participates in steam temperature adjustment, and after the steam temperature returns to a normal value, the temperature-reducing water adjusting valve is automatically closed;
specifically, the second control unit 9 is a temperature control unit, the temperature control of the heating steam is mainly controlled by the first regulating valve 1 and the second regulating valve 2 together, the temperature reducing water device 10 is a standby temperature regulating means, and the outlet of the ejector 4 is in a full-closed state when the temperature is not over-heated;
in step S3, when the second control unit 9 adjusts the opening degrees of the first and second control valves 1 and 2 on the cold and hot sections of the reheat steam, if the control valve 2 of the cold reheat pipeline has been opened to the maximum opening degree, the control valve 1 of the hot reheat pipeline has been closed to the minimum, and the outlet of the ejector is still over-heated, at this time, a desuperheating water device at the outlet of the ejector is put into the desuperheating water device to reduce the steam temperature to a required value, and in step S3, the hot reheat valve adopts the minimum opening degree mode within the valve adjustment range of the cold reheat valve; when the cold readjustment valve is fully opened, the hot readjustment valve participates in temperature control;
specifically, the heating steam pressure is controlled by an adjustable steam ejector actuating mechanism;
the specific control method comprises the following steps:
1. heating steam temperature control method
The temperature control of the heating steam is mainly controlled by a cold re-steam regulating valve and a hot re-steam regulating valve together, and a temperature-reducing water regulating valve is used as a backup control means.
1) Cold and hot reconditioning valve control strategy
The cold readjustment valve is used as a main adjusting means of steam temperature, and the hot readjustment valve is used for auxiliary adjustment. The hot readjustment valve sets different reference opening degrees according to different load points of the unit, so that the cold readjustment valve has more on-off control allowances. In the adjustable range of the cold readjustment valve, the hot readjustment valve does not participate in the adjustment, and the reference opening degree is kept or the slower adjustment speed is set; and after the cold readjustment valve exceeds the adjustable range, the hot readjustment valve participates in steam temperature adjustment. The cold readjustment valve also introduces the unit load as feedforward adjustment, so that the unit has better adjustment performance when the load is changed.
2) Desuperheating water control strategy
The desuperheating water is used as a backup control means, and the system is in a fully closed state when in normal operation. When the temperature of the heating steam exceeds the alarm value and the cold readjusting valve is fully opened (or is more than a certain opening), the temperature-reducing water adjusting valve participates in steam temperature adjustment. After the steam temperature returns to the normal value, the temperature-reducing water regulating valve is automatically closed.
2. Heating steam pressure control
The pressure of the heating steam is controlled by an actuating mechanism of the adjustable steam injector. The load signal of the unit is introduced to be used as feedforward, so that the load-variable control device has better regulation performance.
3. Decoupled control of steam pressure and temperature
Because the steam pressure and the steam temperature are coupled, namely the steam temperature is influenced when the steam pressure is controlled, and the steam pressure is also influenced when the steam temperature is controlled, the two control systems need to be subjected to decoupling control. When the steam pressure is low and the actuating mechanism of the large steam ejector needs to be opened, the large cold readjustment door needs to be opened at the same time, and the small hot readjustment door needs to be closed, so that the steam temperature is kept stable; when the steam temperature is higher and the large cold readjustment door needs to be opened, the actuating mechanism of the steam ejector needs to be closed at the same time, so that the steam pressure is kept stable.
The steam injector can adjust the steam inlet flow to inject the reheated steam, and high-temperature and high-pressure industrial steam meeting the requirements is formed at the outlet of the steam injector.
Among these, two important parameters of the steam ejector: injection coefficient and compression ratio
Calculating the injection coefficient according to the formula (1)
Mu-ejection coefficient;
GT-motive steam flow;
GS-the injected steam flow;
calculating the compression ratio, with reference to equation (2)
Y-compression ratio, i.e., the ratio of injector discharge pressure to suction pressure;
PK-ejector exhaust pressure;
PS-ejector suction pressure;
CpS-the specific heat capacity at constant pressure of the gas to be evacuated;
CpT-the constant pressure specific heat capacity of the motive steam;
CνS-the specific heat capacity at constant pressure of the gas to be evacuated;
wherein the isentropic conversion speed refers to the formula (4)
Va-the velocity of the mixed gas entering the mixing chamber;
V*-critical velocity of mixed gas.
In calculating available energy
On change of value, following equation (5):
Exq-a system
(ii) a change;
q-heat given off by the system;
Anq-a system change;
T0-ambient temperature;
t is the system temperature.
ηdFor energy efficiency, reflecting the energy loss condition of gas in the process of converting kinetic energy and pressure energy when the gas flows, and following the formula (6);
EXTof ejector-powered steam
A value;
EXSthe ejector drawing steam
A value;
EXK-ejector exhaust
A value;
the invention adopts accurate and efficient control logic, accurately controls the flow of cold re-flow, hot re-steam and desuperheating water, realizes the maximization of cold re-flow and the proportioning mode of heat re-flow as less as possible, meets the user requirements and realizes energy conservation and consumption reduction.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (7)
1. A gas source control method for energy-saving mixing of high-temperature high-pressure steam for industrial steam supply comprises mixing equipment, and is characterized in that the mixing equipment comprises a first adjusting valve (1), a second adjusting valve (2), an adjustable actuator (3), a steam ejector (4), a pressure transmitter (5), a temperature transmitter (6) and a steam mixing header (7);
the steam ejector (4) is provided with three connectors, three the connectors comprise a first connector, a second connector and a discharge port, the first connector is connected with a main steam conveying pipe, the second connector is connected with the output end of a steam mixing header (7), the discharge port is connected with a steam supply main pipe, a pressure transmitter (5) and a temperature transmitter (6) are sequentially connected onto the steam supply main pipe, the input end of the steam mixing header (7) is connected with a reheat steam cold section and a reheat steam hot section, a first adjusting valve (1) is installed on the reheat steam hot section at one end of the steam mixing header (7), a second adjusting valve (2) is installed on the reheat steam cold section at one end of the steam mixing header (7), and a second control unit (9) is installed between the first adjusting valve (1) and the second adjusting valve (2) and the temperature transmitter (6), be connected with between the discharge port of temperature transmitter (6) and steam jet ejector (4) desuperheating water installation (10), be connected with first control unit (8) between pressure transmitter (5) and adjustable executor (3), first accent valve (1) and second accent valve (2) are hot readjustment valve and cold readjustment valve respectively.
2. An air source control method for energy-saving mixing of high-temperature high-pressure steam for industrial steam supply is characterized by comprising the following steps of:
s1, taking main steam as power steam, injecting cold/hot remixed steam from the steam mixing header (7), and mixing through the ejector (4);
s2, in the mixing process of the step S1, after the pressure at the outlet of the ejector (4) is stabilized at the value required by a user, the pressure enters a steam supply main pipe from the outlet of the ejector (4), the temperature signal of a transmitter (6) at the outlet is used as a feedback signal, and the opening degrees of a first regulating valve (1) and a second regulating valve (2) on a reheating steam cold section and a reheating steam hot section are regulated through a second control unit (9), wherein:
when the steam temperature rises, a temperature transmitter (6) at the outlet of the ejector (4) transmits a temperature signal to a second control unit (9), and then the second control unit (9) sends an instruction, firstly, the opening degree of a regulating valve (2) on a pipeline of a cold section of the reheat steam is opened, the flow of the cold reheat steam is increased, and then, the opening degree of a regulating valve (1) on a pipeline of a hot section of the reheat steam is closed, so that the cold reheat flow of the cold/hot reheat mixed steam is increased, the hot reheat flow is reduced, and the outlet temperature of the ejector (4) is ensured to be maintained at a required value;
when the steam temperature is reduced, a temperature transmitter (6) at the outlet of the ejector (4) transmits a temperature signal to a second control unit (9), and then the second control unit (9) sends an instruction to firstly open the opening of a regulating valve (1) on a pipeline of a hot section of the reheated steam to increase the flow of the hot reheated steam, and then close the opening of a regulating valve (2) on a pipeline of a cold section of the reheated steam to increase the hot re-flow of the cold/hot re-mixed steam, reduce the cold re-flow and ensure that the outlet temperature of the ejector (4) is maintained at a required value.
S3, in step S2, when the second control unit (9) adjusts the opening degree of the first adjusting valve (1) and the second adjusting valve (2) in the reheating steam cold stage and the reheating steam hot stage, the temperature of the heating steam is preferentially adjusted by using the cold readjustment valve.
And S4, in the step S3, the mixed steam enters a steam supply main pipe through an outlet of the ejector (4) after temperature adjustment and is supplied to a user, wherein when the temperature of the heating steam exceeds an alarm value and the cold readjustment valve is fully opened or is larger than a certain opening degree, the temperature-reducing water adjusting valve participates in steam temperature adjustment, and after the steam temperature returns to a normal value, the temperature-reducing water adjusting valve is automatically closed.
3. The air source control method for the energy-saving mixing of high-temperature high-pressure steam for industrial steam supply according to claim 1, characterized in that the second control unit (9) is a temperature control unit.
4. The air source control method for the energy-saving mixing of the high-temperature high-pressure steam for the industrial steam supply is characterized in that the temperature control of the heating steam is mainly controlled by a first regulating valve (1) and a second regulating valve (2) together, the temperature reducing device (10) is a standby temperature regulating means, and the outlet of the ejector (4) is in a full-closed state when the temperature is not exceeded.
5. The air supply control method of high-temperature high-pressure steam energy-saving mixing for industrial steam supply according to claim 1, characterized in that in step S3, when the second control unit (9) adjusts the opening degree of the first regulating valve (1) and the second regulating valve (2) on the cold section and the hot section of the reheat steam, if the regulating valve (2) of the cold re-pipeline is opened to the maximum opening degree, the regulating valve (1) of the hot re-pipeline is closed to the minimum, and the outlet of the ejector is still over-temperature, at this time, the desuperheating water device put into the outlet of the ejector reduces the steam temperature to the required value.
6. The air supply control method for energy-saving mixing of high-temperature high-pressure steam for industrial steam supply as claimed in claim 1, wherein the thermal readjustment valve is opened in a minimum degree within the valve adjusting range of the cold readjustment valve in the step S3; when the cold readjustment valve is fully opened, the hot readjustment valve participates in temperature control.
7. The air source control method for energy-saving mixing of high-temperature high-pressure steam for industrial steam supply as claimed in claim 1, wherein the pressure of the heating steam is controlled by an adjustable steam injector actuator.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111810845A (en) * | 2020-08-10 | 2020-10-23 | 国电南京电力试验研究有限公司 | Heat supply system and method for meeting high-parameter heat user demand |
| CN112013280A (en) * | 2020-09-14 | 2020-12-01 | 西安热工研究院有限公司 | Two-stage auxiliary steam system with injection and confluence device and working method |
| CN112554966A (en) * | 2020-11-17 | 2021-03-26 | 北方魏家峁煤电有限责任公司 | Control system and method for quick warm valve of main steam valve of steam turbine |
| CN113847551A (en) * | 2021-08-31 | 2021-12-28 | 武汉锅炉集团阀门有限责任公司 | Pressure and temperature regulation system and control method |
| US20220134383A1 (en) * | 2020-11-03 | 2022-05-05 | Netzsch Trockenmahltechnik Gmbh | Operating Method for a Separator and Separator |
| CN115143808A (en) * | 2022-06-28 | 2022-10-04 | 国能龙源蓝天节能技术有限公司 | Industrial steam supply system and steam supply method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07318007A (en) * | 1994-05-20 | 1995-12-08 | Mitsubishi Heavy Ind Ltd | Steam temperature reducer |
| JPH0842811A (en) * | 1994-08-01 | 1996-02-16 | Mitsubishi Heavy Ind Ltd | Steam attemperator with mixer |
| CN2465134Y (en) * | 2001-02-19 | 2001-12-12 | 刘玉田 | Steam heat-jetting type hot-exchanger |
| CN201259213Y (en) * | 2008-08-14 | 2009-06-17 | 天壕节能科技有限公司 | Attemperation system for adjusting temperature of superheated vapour |
| CN102588947A (en) * | 2012-02-29 | 2012-07-18 | 哈尔滨锅炉厂有限责任公司 | Temperature reducer of 350MW tangential firing supercritical boiler reheater and temperature reducing method of temperature reducer |
| CN205977459U (en) * | 2016-09-07 | 2017-02-22 | 中国神华能源股份有限公司 | Steam ejector |
| CN107401739A (en) * | 2016-05-19 | 2017-11-28 | 华电电力科学研究院 | Intelligent pressure and temperature reducing energy-saving control system |
| CN208380644U (en) * | 2018-07-05 | 2019-01-15 | 大连亨利测控仪表工程有限公司 | A kind of threeway jet stream pressure and temperature reducing control system for heat supply network heat supply |
-
2020
- 2020-03-06 CN CN202010149652.7A patent/CN111397395A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07318007A (en) * | 1994-05-20 | 1995-12-08 | Mitsubishi Heavy Ind Ltd | Steam temperature reducer |
| JPH0842811A (en) * | 1994-08-01 | 1996-02-16 | Mitsubishi Heavy Ind Ltd | Steam attemperator with mixer |
| CN2465134Y (en) * | 2001-02-19 | 2001-12-12 | 刘玉田 | Steam heat-jetting type hot-exchanger |
| CN201259213Y (en) * | 2008-08-14 | 2009-06-17 | 天壕节能科技有限公司 | Attemperation system for adjusting temperature of superheated vapour |
| CN102588947A (en) * | 2012-02-29 | 2012-07-18 | 哈尔滨锅炉厂有限责任公司 | Temperature reducer of 350MW tangential firing supercritical boiler reheater and temperature reducing method of temperature reducer |
| CN107401739A (en) * | 2016-05-19 | 2017-11-28 | 华电电力科学研究院 | Intelligent pressure and temperature reducing energy-saving control system |
| CN205977459U (en) * | 2016-09-07 | 2017-02-22 | 中国神华能源股份有限公司 | Steam ejector |
| CN208380644U (en) * | 2018-07-05 | 2019-01-15 | 大连亨利测控仪表工程有限公司 | A kind of threeway jet stream pressure and temperature reducing control system for heat supply network heat supply |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111810845A (en) * | 2020-08-10 | 2020-10-23 | 国电南京电力试验研究有限公司 | Heat supply system and method for meeting high-parameter heat user demand |
| CN112013280A (en) * | 2020-09-14 | 2020-12-01 | 西安热工研究院有限公司 | Two-stage auxiliary steam system with injection and confluence device and working method |
| US20220134383A1 (en) * | 2020-11-03 | 2022-05-05 | Netzsch Trockenmahltechnik Gmbh | Operating Method for a Separator and Separator |
| US11745221B2 (en) * | 2020-11-03 | 2023-09-05 | Netzsch Trockenmahltechnik Gmbh | Operating method for a separator and separator |
| CN112554966A (en) * | 2020-11-17 | 2021-03-26 | 北方魏家峁煤电有限责任公司 | Control system and method for quick warm valve of main steam valve of steam turbine |
| CN112554966B (en) * | 2020-11-17 | 2023-03-28 | 北方魏家峁煤电有限责任公司 | Control system and method for quick warm valve of main steam valve of steam turbine |
| CN113847551A (en) * | 2021-08-31 | 2021-12-28 | 武汉锅炉集团阀门有限责任公司 | Pressure and temperature regulation system and control method |
| CN115143808A (en) * | 2022-06-28 | 2022-10-04 | 国能龙源蓝天节能技术有限公司 | Industrial steam supply system and steam supply method |
| CN115143808B (en) * | 2022-06-28 | 2025-03-21 | 国能龙源蓝天节能技术有限公司 | Industrial steam supply system and steam supply method |
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Application publication date: 20200710 |