CN111365750A - Three-level cascade heating system and integral operation optimizing method - Google Patents
Three-level cascade heating system and integral operation optimizing method Download PDFInfo
- Publication number
- CN111365750A CN111365750A CN202010229648.1A CN202010229648A CN111365750A CN 111365750 A CN111365750 A CN 111365750A CN 202010229648 A CN202010229648 A CN 202010229648A CN 111365750 A CN111365750 A CN 111365750A
- Authority
- CN
- China
- Prior art keywords
- steam
- condenser
- level
- upgrading device
- heating system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 127
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000006835 compression Effects 0.000 claims abstract description 94
- 238000007906 compression Methods 0.000 claims abstract description 94
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 238000005265 energy consumption Methods 0.000 claims abstract description 50
- 238000000605 extraction Methods 0.000 claims abstract description 23
- 238000005457 optimization Methods 0.000 claims abstract description 21
- 238000004364 calculation method Methods 0.000 claims abstract description 12
- 239000003245 coal Substances 0.000 claims description 14
- 102000003712 Complement factor B Human genes 0.000 claims description 8
- 108090000056 Complement factor B Proteins 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000013479 data entry Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 description 4
- 238000009795 derivation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- 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
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
-
- 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
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1048—Counting of energy consumption
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a three-level cascade heating system and an integral operation optimizing method, which are suitable for the field of three-level cascade heating systems. Circulating water of the heat supply network returns to enter a primary high-back-pressure condenser and is heated by exhaust steam of a low-pressure cylinder of a steam turbine in a high-back-pressure operation mode; the outlet of the first-stage high back pressure condenser is connected with the inlet of the condenser of the second-stage steam compression upgrading device; the outlet of the condenser of the secondary steam compression upgrading device is connected with the inlet of the tertiary heating network heater and is heated by utilizing the steam extraction of the steam turbine intermediate pressure cylinder; the outlet of the third-stage heat supply network heater is connected with the heat supply network circulating water for water supply. The invention can accurately control the time optimization through the three-level cascade heat supply system optimization method so as to reduce the heat supply energy consumption cost of the system, monitors key detection parameters such as the exhaust steam utilization amount of the first-level high back pressure condenser, the exhaust steam utilization amount of the second-level steam compression upgrading device condenser, the actual performance of the steam compression upgrading device and the like, and is used for monitoring the heat supply energy consumption of the system at the time by the optimization system energy consumption calculation model.
Description
Technical Field
The invention relates to the field of three-level step heating systems, in particular to a three-level step heating system and an integral operation optimizing method.
Background
With the rising of domestic energy cost and the improvement of environmental protection requirements, efficient energy recovery equipment becomes a new trend in recent years. The cogeneration is increasingly becoming an effective way for energy conservation and consumption reduction of thermal power enterprises in China, and the central heating by using steam extraction or exhaust steam of a steam turbine in northern areas is an important improvement way for the cogeneration of the thermal power enterprises. How to effectively reduce the heat supply energy consumption and the transformation cost is the key research point of the current heat supply technology.
Based on the second law of thermodynamics
The analysis principle can be obtained as follows: for the current heating system of a thermal power plant, the grade difference of steam and water can be effectively reduced by adopting a multi-heat-source step heating mode, so that
The loss is reduced. For the current common three-stage step heating system, the heat supply energy consumption is influenced by a plurality of parameters, such as unit backpressure, heat supply network circulating water quantity, suction ratio of a steam compression upgrading device, intermediate exhaust steam extraction pressure and the like, and the change of each parameter influences the economic index of heat supply. How to optimally control the key parameters to minimize the energy consumption of the three-level step heating system is a problem to be solved urgently at present.
The heat supply energy consumption cost of the multi-heat-source cascade heating system is influenced by multiple parameters, and if optimization control is not carried out, especially under the condition that the actual operation working condition deviates from the design working condition, the acquisition of key detection parameters such as the dead steam utilization amount of the first-stage high-backpressure condenser, the dead steam utilization amount of the second-stage steam compression upgrading device and the actual performance parameters of the steam compression upgrading device is particularly critical for the optimization of the three-stage cascade heating system.
Disclosure of Invention
The invention aims to solve the technical problem of how to provide a three-level cascade heating system and an integral operation optimizing method which can accurately control time optimization and reduce the heating energy consumption cost of the system.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a three-level step heating system is characterized in that: the system comprises a primary high-back-pressure condenser, wherein circulating water of a heat supply network enters the primary high-back-pressure condenser and is heated by exhaust steam of a low-pressure cylinder of a steam turbine in a high-back-pressure operation mode; the outlet of the first-stage high back pressure condenser is connected with the inlet of the condenser of the second-stage steam compression upgrading device; the outlet of the condenser of the secondary steam compression upgrading device is connected with the inlet of the tertiary heating network heater and is heated by utilizing the steam exhausted by the steam turbine intermediate pressure cylinder to extract steam; and the outlet of the third-stage heat supply network heater is connected with heat supply network circulating water for water supply.
The steam turbine low-pressure cylinder exhausts steam to a first-stage high-backpressure condenser adjusting butterfly valve and a first steam compression upgrading device adjusting butterfly valve which are respectively connected with an inlet of the first-stage high-backpressure condenser and an inlet of the steam compression upgrading device; the steam turbine intermediate pressure cylinder exhausts steam to a second steam compression upgrading device regulating valve and a third-level heating network heater regulating valve which are respectively connected with an inlet of the steam compression upgrading device and an inlet of the third-level heating network heater; and the outlet of the steam compression upgrading device is connected with the inlet of a condenser of the secondary steam compression upgrading device.
And further, respectively feeding the primary high back pressure condenser, the secondary steam compression upgrading device condenser and the tertiary heat supply network heater according to the heat demand temperature.
Furthermore, the steam compression upgrading device can be a steam-driven centrifugal steam compressor, a hot press and a steam booster.
The overall operation optimizing method based on the three-level cascade heating system comprises an energy consumption calculation model of the three-level cascade heating system:
thermal equilibrium constraint:
wherein, W1rHeating power W for a first-stage high-back-pressure condenser2rHeating power W of condenser of secondary steam compression upgrading device3rHeating power of three-stage heating network heater, WgrThe total heating power also requires a thermal load for the thermal user; gbThe waste steam utilization amount h of the primary high back pressure condenserbIs the exhaust enthalpy value of the low pressure cylinder of the steam turbine, C is the specific heat capacity of water, tqbsThe drainage temperature G of a first-level high-back-pressure condenserrFor circulating water in the heat supply network, tbcThe outlet water temperature t of the high back pressure condenserhThe temperature of return water of the heat supply network is set; p is a radical ofbIs the exhaust pressure of the low pressure cylinder, tdc1The end difference of the first-stage high back pressure condenser is obtained; gdThe steam utilization quantity h of a condenser of a two-stage steam compression upgrading devicedThe enthalpy value of the steam at the outlet of the steam compression upgrading device, tdsThe drainage temperature t of a condenser of the two-stage steam compression upgrading devicedcThe temperature of the water outlet of a condenser of the secondary steam compression upgrading device; p is a radical ofdFor steam compression upgrading device outlet steam pressure, tdThe temperature of steam at the outlet of the steam compression upgrading device, α the compression ratio of the steam compression upgrading device, GzThe middle exhaust steam extraction volume h for the three-level heat supply network heatercFor medium extraction enthalpy, tzsFor the drainage temperature of the heater of the heating network, tgsSupplying water temperature for the circulating water of the heat supply network;
the energy consumption cost calculation model of the three-level cascade heating system is as follows:
wherein: wfHeating power by steam turbine exhaust for three-stage cascade heating system, WzpFor three-stage step heating systemHeating power by using medium exhaust steam extraction; b isfSupply of heat and coal consumption to steam turbine exhaust, BzpFor supplying heat and coal consumption to medium-exhaust extraction, β is the high-back-pressure exhaust steam heat supply utilization coefficient of turbine, B3jThe coal consumption is supplied for the whole three-level step heating system; gsThe utilization amount of the exhaust steam of the steam compression upgrading device G1The mass flow rate of the steam inlet of the low-pressure cylinder is; wrxTotal power of circulating water pump, h heat supply network circulating water pump lift, η pump efficiency, EgrEnergy consumption cost for three-level cascade heating system, SmjIs the unit price of standard coal, SdjThe price of the power is the price of the power on the internet.
Further, the optimizing steps are as follows:
setting an initial value of a control model;
inputting and reading a working condition value required by the system, wherein data which cannot be directly read is manually input, and the rest data is read through a DCS;
calculating a theoretical calculated value of energy consumption cost of the three-level cascade heating system and an actual calculated value of energy consumption cost of the three-level cascade heating system under the condition of satisfying the boundary condition;
data entry formula
Judging whether optimization is needed and giving an opinion, if the condition is not met, suggesting the optimization; if the conditions are met, optimizing is not suggested, and the steps of inputting and reading the working condition value are returned;
if the optimization is suggested, enter the formula
If the condition is met, giving a disturbance factor C; if the condition is not met, entering the next formula for judgment;
according to the instruction, giving a disturbance factor C and calculating an energy consumption cost value, and entering a formula
If the conditions are met, returning to the step of inputting and reading the working condition values; if the condition is not met, returning to the step C of giving the disturbance factor;
according to the instruction, entering a formula
If the condition is met, giving a disturbance factor B; if the condition is not met, entering a next formula to give a disturbance factor A;
according to the instruction, giving a disturbance factor B and calculating an energy consumption cost value, and entering a formula
If the condition is met, returning to the step C of giving the disturbance factor; if the condition is not met, returning to the step B of giving the disturbance factor;
according to the instruction, giving a disturbance factor A and calculating an energy consumption cost value; entry formula
If the condition is met, returning to the step B of giving the disturbance factor; and if the condition is not met, returning to the step A of the given disturbance factor.
Further, the number of disturbance factors of the optimizing control logic is greater than or equal to 2.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the invention can accurately control the optimization at any moment by the optimization method of the three-level cascade heating system, thereby reducing the heating energy consumption cost of the system. The method can monitor key detection parameters such as the exhaust steam utilization of the first-stage high-backpressure condenser, the exhaust steam utilization of the condenser of the second-stage steam compression upgrading device, the actual performance of the steam compression upgrading device and the like, and is used for optimizing the system energy consumption calculation model to monitor the heat supply energy consumption of the system at any time.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic view of a three-stage cascade heating system of the present invention;
FIG. 2 is a logic diagram of the optimizing control of the three-stage cascade heating system of the present invention.
Wherein: 101-a first-level high back pressure condenser, 102-a second-level steam compression upgrading device condenser, 103-a third-level heating network heater, 104-a steam compression upgrading device, 201-a first-level high back pressure condenser adjusting butterfly valve, 202-a steam compression upgrading device adjusting butterfly valve, 203-a steam compression upgrading device adjusting valve, 204-a third-level heating network heater adjusting valve, 301-heating network circulating water returning, 302-heating network circulating water supply, 303-steam turbine low-pressure cylinder steam exhaust, and 304-steam turbine medium-pressure cylinder steam exhaust and steam extraction.
Detailed Description
The technical solutions in the embodiments of the present invention are 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
The invention provides a three-level step heating system and an integral operation optimizing method, wherein a steam source of the three-level step heating system is steam turbine low-pressure cylinder exhaust steam and medium-pressure cylinder exhaust steam, and the three-level step heating system comprises a first-level high back pressure condenser, a second-level steam compression upgrading device condenser, a three-level heating network heater, a steam compression upgrading device, a pipe fitting and a valve which are connected with the equipment. The operation optimizing method of the three-level cascade heating system comprises three-level cascade heating system components and an operation mode, key performance parameter monitoring and energy consumption index derivation of the optimizing method of the three-level cascade heating system, an energy consumption calculation model of the three-level cascade heating system and optimizing control logic of the three-level cascade heating system. The optimizing system can calculate the economic operation mode under the boundary condition of the system according to the disturbance control of the key adjustable parameters through the energy consumption of the system, thereby realizing the optimizing operation of the three-level cascade heating system.
The invention mainly comprises four parts: the method comprises the steps of three-level cascade heating system composition and operation mode, key performance parameter monitoring and energy consumption index derivation of a three-level cascade heating system optimizing method, a three-level cascade heating system energy consumption calculation model and three-level cascade heating system optimizing control logic. In one embodiment of the present invention, the number of disturbance factors of the optimizing control logic is 3.
One-level and three-level step heating system composition and operation mode
The three-level step heating system mainly comprises a first-level high back pressure condenser 101, a second-level steam compression upgrading device condenser 102, a third-level heating network heater 103, a steam compression upgrading device 104, an exhaust steam to first-level high back pressure condenser adjusting butterfly valve 201, a low-pressure cylinder exhaust steam to steam compression upgrading device adjusting butterfly valve 202, a middle exhaust steam to steam compression upgrading device adjusting valve 203, a middle exhaust steam to third-level heating network heater adjusting valve 204, heating network circulating water return water 301, heating network circulating water supply 302, a steam turbine low-pressure cylinder exhaust steam 303, a steam turbine middle-pressure cylinder exhaust steam 304 and a pipe fitting for connecting the devices.
The method comprises the following steps of firstly feeding circulating water backwater of a heat supply network into a first-stage high-backpressure condenser to be heated by steam exhausted from a low-pressure cylinder of a steam turbine in a high-backpressure operation mode, then feeding the circulating water backwater into a second-stage steam compression upgrading device condenser to be heated by steam after upgrading of a steam compression upgrading device, and finally feeding the circulating water backwater into a third-stage heat supply network heater to be heated by steam exhausted from a medium-pressure cylinder of the steam turbine. According to the temperature required by a heat user, a first-stage high back pressure condenser, a second-stage steam compression upgrading device condenser and a third-stage heat supply network heater can be respectively input.
Key performance parameter monitoring and energy consumption index derivation method for second-level and third-level cascade heating system optimization method
The optimization key parameters of the three-level cascade heating system are as follows: the steam turbine comprises a steam turbine low-pressure cylinder exhaust steam enthalpy value, a primary high-back-pressure condenser exhaust steam utilization amount, a secondary steam compression upgrading device condenser steam utilization amount, a steam compression upgrading device power steam amount, a steam compression upgrading device exhaust steam utilization amount, a low-pressure cylinder steam inlet flow rate and an air cooling island upper island steam flow rate.
Steam turbine low pressure cylinder exhaust enthalpy:
under normal working conditions, the exhaust steam of the low-pressure cylinder is wet steam, and the enthalpy value of the low-pressure cylinder cannot be found according to the pressure and the temperature. The efficiency of the low-pressure cylinder under the high-back-pressure operation condition is calculated according to a high-back-pressure operation condition heat balance diagram provided by a steam turbine plant, the efficiency is not greatly changed in actual operation, and the enthalpy value of the exhaust steam of the low-pressure cylinder under the changed condition is deduced in a mode that the cylinder effect is not changed.
The exhaust enthalpy value h of the low-pressure cylinder of the steam turbine is calculated by the formulabIn the formula, ηdgFor low cylinder efficiency, hcFor medium extraction enthalpy, pcFor medium extraction pressure, tcFor the medium exhaust steam extraction temperature, hbFor the exhaust enthalpy, h, of the low-pressure cylinder of the steam turbineblxIs the isentropic exhaust enthalpy, p, of the turbine at the exhaust pressurebIs the exhaust pressure of the low-pressure cylinder, ScEntropy value of middle extraction steam.
The utilization amount of exhaust steam of a first-level high-backpressure condenser is as follows:
the upper formula calculates the first-level high back pressure condenser according to the temperature rise of the circulating water of the heat supply network in the first-level high back pressure condenser and utilizes the steam exhaust amount, and the lower formula comprises the following components: gbThe waste steam utilization amount of the first-level high back pressure condenser GrIs the circulating water quantity of the heat supply network, C is the specific heat capacity of water, tbcThe outlet water temperature t of the high back pressure condenserhIs the return water temperature of the heat supply network, tqbsThe temperature is the drainage temperature of the first-level high-back-pressure condenser.
Steam utilization of a condenser of the secondary steam compression upgrading device:
the steam utilization amount of the condenser of the secondary steam compression upgrading device is calculated according to the temperature rise of the circulating water of the heat supply network in the condenser of the secondary steam compression upgrading device, and in the formula: gdThe steam utilization quantity, t, of a condenser of the two-stage steam compression upgrading devicedcThe temperature h of the water outlet of a condenser of the two-stage steam compression upgrading devicedThe enthalpy value of the steam at the outlet of the steam compression upgrading device can be found out through the steam pressure and the temperature at the outlet of the steam compression upgrading device tdsThe temperature is the drainage temperature of a condenser of the secondary steam compression upgrading device.
The steam compression upgrading device comprises the following components in parts by weight:
Gs＝Gd-Gm
the power steam quantity of the steam compression upgrading device and the dead steam utilization quantity of the steam compression upgrading device can be calculated through the two formulas, wherein the formulas are as follows: gsThe utilization amount of the exhaust steam of the steam compression upgrading device GdSteam utilization capacity G of condenser of two-stage steam compression upgrading devicemThe steam quantity of the power of the steam compression upgrading device is 1/mu, the injection ratio of the steam compression upgrading device is hcFor the central extraction enthalpy value, hdThe enthalpy value h of the steam at the outlet of the steam compression upgrading devicebThe enthalpy of the low-pressure cylinder exhaust of the steam turbine.
Low-pressure cylinder steam admission flow:
G1＝k×p01
additionally installing a low-pressure cylinder steam inlet pressure measuring point on a low-pressure communicating pipe in the steam turbine, and calculating the low-pressure cylinder steam inlet flow according to a Friedel simplified formula, wherein the formula comprises the following steps: g1Is the mass flow of the inlet steam of the low-pressure cylinder, k is the calculation coefficient of the inlet steam of the low-pressure cylinder, p01The pressure is the inlet pressure of the low-pressure cylinder.
Steam flow on the air cooling island:
Gkl＝G1-Gb-Gs
considering that the six-section steam extraction amount is small under the high-back-pressure operation working condition, the seven-section steam extraction is almost not performed, and the steam flow on the upper island of the air cooling island under the high-back-pressure operation working condition can be subtracted by the first-stage high-back-pressure steam flow through the low-pressure cylinderAnd calculating the utilization amount of the dead steam of the condenser and the utilization amount of the dead steam of the steam compression upgrading device. In the formula: gklIs the steam flow on the air cooling island.
The method for acquiring the key performance parameters of the optimization method of the three-level cascade heating system is described.
Energy consumption calculation model of three-level and three-level step heating system
The three-level cascade heating system utilizes the following heat balance constraint conditions:
wherein the formula W1r+W2r+W3r＝WgrMeaning that the sum of the heating power of each stage of the three-stage heating system is the total heating power of the system, W1rHeating power W for a first-stage high-back-pressure condenser2rHeating power W of condenser of secondary steam compression upgrading device3rHeating power of three-stage heating network heater, WgrThe heat load is also required for the heat consumers for the total heating power.
Formula W1r＝Gb(hb-c×tqbs)＝Gr×c×(tbc-th) Meaning that the steam side of the first-level high back pressure condenser is in thermal balance with the water side of the heat supply network.
Formula tbc＝t_p(pb)-tdc1Indicating that the outlet water temperature of the first-level high back pressure condenser is the exhaust steam temperature of the steam turbine minus the end difference, wherein tdc1The end difference of the first-stage high back pressure condenser shows the relation between the outlet water temperature of the first-stage high back pressure condenser and the exhaust pressure of the low pressure cylinder.
Formula W2r＝Gd(hd-c×tds)＝Gr×c×(tdc-tbc) The steam side of the condenser of the secondary steam compression upgrading device is in thermal balance with the water side of the heat supply network.
Formula hd＝hd_PT(pd，td) An enthalpy value calculation formula of steam at an outlet of the steam compression upgrading device, wherein tdThe temperature of steam at the outlet of the steam compression upgrading device.The enthalpy value of the steam at the outlet of the steam compression upgrading device is related to the steam pressure and the steam temperature at the outlet of the steam compression upgrading device.
Formula (II)
Is a compression ratio formula of a steam compression upgrading device, wherein α is the compression ratio of the steam compression upgrading device, pdIs the steam pressure at the outlet of the steam compression upgrading device.
Formula W3r＝Gz(hc-c×tzs)＝Gr×c×(tgs-tdc) Showing the steam side of the three-level heat supply network heater and the water side of the heat supply network in thermal equilibrium, wherein GzThe middle exhaust steam extraction volume t for the three-stage heat supply network heaterzsFor the drainage temperature of the heater of the heating network, tgsAnd the water supply temperature is the circulating water supply temperature of the heat supply network.
The energy consumption cost calculation model of the three-level cascade heating system is as follows:
wherein the formula Wf+Wzp＝WgrIndicating that the sum of the exhaust steam heating power and the intermediate exhaust steam extraction heating power of the steam turbine is the total heat supply power, wherein W isfHeating power by steam turbine exhaust for three-stage cascade heating system, WzpThe exhaust steam heating power is utilized for the three-level cascade heating system.
Formula (II)
Indicating the coal consumption cost of the three-level cascade heating system, wherein BfThe coal consumption is supplied for the steam exhaust of the steam turbine, the good heat return method is used for calculating the coal consumption, the value is related to the operation back pressure of the steam turbine, BzpThe coal consumption is calculated by a good heat return method, the value is related to the pressure and the temperature of the exhaust steam in the turbine, β is the utilization coefficient of the high-back-pressure exhaust steam heat supply of the turbine, B3jThe coal consumption is supplied for the whole three-level cascade heating system.
Formula (II)
The high back pressure exhaust steam heat supply utilization rate of the steam turbine is shown, and the low pressure cylinder exhaust steam quantity of the steam turbine is replaced by the low pressure cylinder inlet steam quantity for simplifying a formula.
Formula (II)
The method is a formula for calculating the electric power of the circulating water pump of the heat supply network, wherein the formula comprises the following steps: wrxTotal power of circulating water pump GrThe water circulation amount of the heat supply network, the lift of a water circulation pump of the heat supply network and the efficiency of the pump are h and η respectively.
Formula Egr＝B3j×Smj+Wrx×SdjShowing the overall energy consumption cost of the three-level cascade heating system, wherein EgrEnergy consumption cost for three-level cascade heating system, SmjIs the unit price of standard coal, SdjThe price of the power is the price of the power on the internet. The purpose of the optimization is to make E within the allowable range of the boundary conditionsgrTo a minimum.
And after the model is established, analyzing the influence of the key adjustable parameters on the energy consumption cost of the three-level cascade heating system by using an orthogonal test.
For example: circulating water quantity G of heat supply networkrExhaust pressure p of low pressure cylinderbSteam pressure p at outlet of steam compression upgrading devicedThe equal parameters are orthogonal test factor A, factor B and factor C. The following rules can be derived by orthogonal experiments:
ΔEgr(A)＞ΔEgr(B)＞ΔEgr(C)
in the formula: delta Egr(A) The influence value of the factor A on the energy consumption cost of the three-level cascade heating system, delta Egr(B) The influence value of the change of the factor B on the energy consumption cost of the three-level cascade heating system, delta Egr(C) The influence value of the factor C on the energy consumption cost of the three-level cascade heating system is shown.
Optimizing control logic of the four-level and three-level step heating system.
The logic diagram of the optimizing control of the three-stage cascade heating system is shown in FIG. 2, wherein EgrsActual calculated value of energy consumption cost of three-level cascade heating system, EgrlThe method is characterized in that the method is a theoretical calculated value of energy consumption cost of a three-level cascade heating system, x%, y% and z% are direct error rates of an actual calculated value and the theoretical calculated value of the energy consumption cost of the three-level cascade heating system, and the method has the following relation: x% < y% < z%.
As shown in fig. 2, after the optimizing control logic of the three-level cascade heating system is enabled, the main steps are as follows:
setting an initial value of a control model;
inputting and reading a working condition value required by the system, wherein data which cannot be directly read is manually input, and the rest data is read through a DCS;
calculating a theoretical calculated value of energy consumption cost of the three-level cascade heating system and an actual calculated value of energy consumption cost of the three-level cascade heating system under the condition of satisfying the boundary condition;
data entry formula
Judging whether optimization is needed and giving an opinion, if the condition is not met, suggesting the optimization; if the conditions are met, optimizing is not suggested, and the steps of inputting and reading the working condition value are returned;
if the optimization is suggested, enter the formula
If the condition is met, giving a disturbance factor C; if the condition is not met, entering the next formula for judgment;
according to the instruction, giving a disturbance factor C and calculating an energy consumption cost value, and entering a formula
If the conditions are met, returning to the step of inputting and reading the working condition values; if the condition is not met, returning to the step C of giving the disturbance factor;
according to the instruction, entering a formula
If the condition is met, giving a disturbance factor B; if the condition is not met, entering a next formula to give a disturbance factor A;
according to the instruction, giving a disturbance factor B and calculating an energy consumption cost value, and entering a formula
If the condition is met, returning to the step C of giving the disturbance factor; if the condition is not met, returning to the step B of giving the disturbance factor;
according to the instruction, giving a disturbance factor A and calculating an energy consumption cost value; entry formula
If the condition is met, returning to the step B of giving the disturbance factor; and if the condition is not met, returning to the step A of the given disturbance factor.
The steam compressing and upgrading device can be a steam-driven centrifugal steam compressor, a hot press and a steam booster.
Claims (7)
1. A three-level step heating system is characterized in that: the system comprises a first-stage high-back-pressure condenser (101), wherein circulating water backwater (301) of a heat supply network enters the first-stage high-back-pressure condenser (101) and is heated by exhaust steam of a low-pressure cylinder of a steam turbine in a high-back-pressure operation mode; an outlet of the first-stage high back pressure condenser (101) is connected with an inlet of a second-stage steam compression upgrading device condenser (102); an outlet of a condenser (102) of the secondary steam compression upgrading device is connected with an inlet of a tertiary heating network heater (103), and the secondary steam compression upgrading device is heated by utilizing steam extraction of a steam turbine intermediate pressure cylinder; and the outlet of the third-stage heat supply network heater (103) is connected with a heat supply network circulating water supply (302).
2. A three level step heating system as claimed in claim 1, wherein: the steam turbine low-pressure cylinder exhaust steam (303) is connected to a first-level high-backpressure condenser adjusting butterfly valve (201) and a first steam compression upgrading device adjusting butterfly valve (202) and is respectively connected with an inlet of the first-level high-backpressure condenser (101) and an inlet of the steam compression upgrading device (104); steam extraction (304) of a steam turbine intermediate pressure cylinder is connected with a second steam compression upgrading device regulating valve (203) and a third-level heating network heater regulating valve (204) and is respectively connected with an inlet of a steam compression upgrading device (104) and an inlet of a third-level heating network heater (103); an outlet of the steam compression upgrading device (104) is connected with an inlet of the secondary steam compression upgrading device condenser (102).
3. A three level step heating system as claimed in claim 1, wherein: and respectively feeding the primary high back pressure condenser (101), the secondary steam compression upgrading device condenser (102) and the tertiary heat supply network heater (103) according to the heat demand temperature.
4. A three level step heating system as claimed in claim 1, wherein: the steam compression upgrading device (104) can be a steam-driven centrifugal steam compressor, a hot press and a steam booster.
5. The integral operation optimizing method based on the three-level cascade heating system is characterized by comprising the following steps of: the method comprises a three-level cascade heating system energy consumption calculation model:
thermal equilibrium constraint:
wherein, W1rHeating power W for a first-stage high-back-pressure condenser2rHeating power W of condenser of secondary steam compression upgrading device3rHeating power of three-stage heating network heater, WgrThe total heating power also requires a thermal load for the thermal user; gbThe waste steam utilization amount h of the primary high back pressure condenserbIs the exhaust enthalpy value of the low pressure cylinder of the steam turbine, C is the specific heat capacity of water, tqbsThe drainage temperature G of a first-level high-back-pressure condenserrFor circulating water in the heat supply network, tbcThe outlet water temperature t of the high back pressure condenserhThe temperature of return water of the heat supply network is set; p is a radical ofbIs the exhaust pressure of the low pressure cylinder, tdc1The end difference of the first-stage high back pressure condenser is obtained; gdThe steam utilization quantity h of a condenser of a two-stage steam compression upgrading devicedUpgrading for vapor compressionEnthalpy of steam at the outlet of the device, tdsThe drainage temperature t of a condenser of the two-stage steam compression upgrading devicedcThe temperature of the water outlet of a condenser of the secondary steam compression upgrading device; p is a radical ofdFor steam compression upgrading device outlet steam pressure, tdThe temperature of steam at the outlet of the steam compression upgrading device, α the compression ratio of the steam compression upgrading device, GzThe middle exhaust steam extraction volume h for the three-level heat supply network heatercFor medium extraction enthalpy, tzsFor the drainage temperature of the heater of the heating network, tgsSupplying water temperature for the circulating water of the heat supply network;
the energy consumption cost calculation model of the three-level cascade heating system is as follows:
wherein: wfHeating power by steam turbine exhaust for three-stage cascade heating system, WzpThe medium-exhaust steam extraction heating power is utilized for the three-level cascade heating system; b isfSupply of heat and coal consumption to steam turbine exhaust, BzpFor supplying heat and coal consumption to medium-exhaust extraction, β is the high-back-pressure exhaust steam heat supply utilization coefficient of turbine, B3jThe coal consumption is supplied for the whole three-level step heating system; gsThe utilization amount of the exhaust steam of the steam compression upgrading device G1The mass flow rate of the steam inlet of the low-pressure cylinder is; wrxTotal power of circulating water pump, h heat supply network circulating water pump lift, η pump efficiency, EgrEnergy consumption cost for three-level cascade heating system, SmjIs the unit price of standard coal, SdjThe price of the power is the price of the power on the internet.
6. The overall operation optimizing method based on the three-level cascade heating system according to claim 5, wherein: the optimizing step is
Setting an initial value of a control model;
inputting and reading a working condition value required by the system, wherein data which cannot be directly read is manually input, and the rest data is read through a DCS;
calculating a theoretical calculated value of energy consumption cost of the three-level cascade heating system and an actual calculated value of energy consumption cost of the three-level cascade heating system under the condition of satisfying the boundary condition;
data entry formula
Judging whether optimization is needed and giving an opinion, if the condition is not met, suggesting the optimization; if the conditions are met, optimizing is not suggested, and the steps of inputting and reading the working condition value are returned;
if the optimization is suggested, enter the formula
If the condition is met, giving a disturbance factor C; if the condition is not met, entering the next formula for judgment;
according to the instruction, giving a disturbance factor C and calculating an energy consumption cost value, and entering a formula
If the conditions are met, returning to the step of inputting and reading the working condition values; if the condition is not met, returning to the step C of giving the disturbance factor;
according to the instruction, entering a formula
If the condition is met, giving a disturbance factor B; if the condition is not met, entering a next formula to give a disturbance factor A;
according to the instruction, giving a disturbance factor B and calculating an energy consumption cost value, and entering a formula
If the condition is met, returning to the step C of giving the disturbance factor; if the condition is not met, returning to the step B of giving the disturbance factor;
according to the instruction, giving a disturbance factor A and calculating an energy consumption cost value; entry formula
If the condition is satisfied, returning the given disturbanceStep B, dynamic factor; and if the condition is not met, returning to the step A of the given disturbance factor.
7. The overall operation optimizing method based on the three-level cascade heating system according to claim 6, wherein: the number of disturbance factors of the optimizing control logic is more than or equal to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010229648.1A CN111365750B (en) | 2020-03-27 | 2020-03-27 | Overall operation optimization method based on three-stage cascade heat supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010229648.1A CN111365750B (en) | 2020-03-27 | 2020-03-27 | Overall operation optimization method based on three-stage cascade heat supply system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111365750A true CN111365750A (en) | 2020-07-03 |
| CN111365750B CN111365750B (en) | 2021-05-28 |
Family
ID=71209169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010229648.1A Active CN111365750B (en) | 2020-03-27 | 2020-03-27 | Overall operation optimization method based on three-stage cascade heat supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111365750B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112228940A (en) * | 2020-09-10 | 2021-01-15 | 北京京能科技有限公司 | Heating system combining vapor compressor and high-back-pressure heating and adjusting method |
| CN112595137A (en) * | 2020-12-10 | 2021-04-02 | 东方电气集团东方汽轮机有限公司 | Method for on-line monitoring and analyzing performance of condenser and computer expert system |
| CN112762499A (en) * | 2021-02-03 | 2021-05-07 | 上海舟虹电力工程技术中心 | Heating method for intelligently adjusting gradient utilization of waste steam upgrading heat energy |
| CN112879113A (en) * | 2021-03-22 | 2021-06-01 | 西安交通大学 | Condenser economical optimization method for thermal power plant |
| CN113051752A (en) * | 2021-03-22 | 2021-06-29 | 西安热工研究院有限公司 | Method for determining optimal heat source of high-pressure air energy storage system electrically coupled with coal |
| CN115095898A (en) * | 2022-06-01 | 2022-09-23 | 华能国际电力股份有限公司上安电厂 | Heat supply system economic operation analysis method based on exhaust steam condenser |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2602651B1 (en) * | 1976-01-24 | 1977-08-11 | Ame Technik Arendt Mildner & E | Electric night storage heating |
| JPH08284612A (en) * | 1995-04-18 | 1996-10-29 | Hitachi Ltd | Dual-purpose electricity and steam generation plant and heat supply method thereof |
| CN203454250U (en) * | 2013-09-16 | 2014-02-26 | 北京国电德安电力工程有限公司 | Combined heat supply unit system |
| CN106930792A (en) * | 2017-03-16 | 2017-07-07 | 林文华 | Adjusting method of the vapour compression machine in the application system of fired power generating unit exhaust steam in steam turbine upgrading heat supply |
| WO2018143521A1 (en) * | 2017-02-06 | 2018-08-09 | 진정홍 | Organic rankine cycle power generation system having reheating means |
| CN108443939A (en) * | 2018-04-19 | 2018-08-24 | 联合瑞升（北京）科技有限公司 | A kind of exhaust steam residual heat suitable for water cooling Steam Turbine recycles heating system |
| CN109556161A (en) * | 2018-10-07 | 2019-04-02 | 联合瑞升（北京）科技有限公司 | A kind of multimachine interconnection exhaust steam residual heat recycling system |
-
2020
- 2020-03-27 CN CN202010229648.1A patent/CN111365750B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2602651B1 (en) * | 1976-01-24 | 1977-08-11 | Ame Technik Arendt Mildner & E | Electric night storage heating |
| JPH08284612A (en) * | 1995-04-18 | 1996-10-29 | Hitachi Ltd | Dual-purpose electricity and steam generation plant and heat supply method thereof |
| CN203454250U (en) * | 2013-09-16 | 2014-02-26 | 北京国电德安电力工程有限公司 | Combined heat supply unit system |
| WO2018143521A1 (en) * | 2017-02-06 | 2018-08-09 | 진정홍 | Organic rankine cycle power generation system having reheating means |
| CN106930792A (en) * | 2017-03-16 | 2017-07-07 | 林文华 | Adjusting method of the vapour compression machine in the application system of fired power generating unit exhaust steam in steam turbine upgrading heat supply |
| CN108443939A (en) * | 2018-04-19 | 2018-08-24 | 联合瑞升（北京）科技有限公司 | A kind of exhaust steam residual heat suitable for water cooling Steam Turbine recycles heating system |
| CN109556161A (en) * | 2018-10-07 | 2019-04-02 | 联合瑞升（北京）科技有限公司 | A kind of multimachine interconnection exhaust steam residual heat recycling system |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112228940A (en) * | 2020-09-10 | 2021-01-15 | 北京京能科技有限公司 | Heating system combining vapor compressor and high-back-pressure heating and adjusting method |
| CN115200064A (en) * | 2020-09-10 | 2022-10-18 | 北京京能科技有限公司 | Adjusting method of heat supply system combining vapor compressor and high-back-pressure heat supply |
| CN115200064B (en) * | 2020-09-10 | 2023-09-22 | 北京京能科技有限公司 | Adjusting method of heating system combining vapor compressor with high back pressure heating |
| CN112595137A (en) * | 2020-12-10 | 2021-04-02 | 东方电气集团东方汽轮机有限公司 | Method for on-line monitoring and analyzing performance of condenser and computer expert system |
| CN112762499A (en) * | 2021-02-03 | 2021-05-07 | 上海舟虹电力工程技术中心 | Heating method for intelligently adjusting gradient utilization of waste steam upgrading heat energy |
| CN112879113A (en) * | 2021-03-22 | 2021-06-01 | 西安交通大学 | Condenser economical optimization method for thermal power plant |
| CN113051752A (en) * | 2021-03-22 | 2021-06-29 | 西安热工研究院有限公司 | Method for determining optimal heat source of high-pressure air energy storage system electrically coupled with coal |
| CN112879113B (en) * | 2021-03-22 | 2022-06-07 | 西安交通大学 | Condenser economical optimization method for thermal power plant |
| CN115095898A (en) * | 2022-06-01 | 2022-09-23 | 华能国际电力股份有限公司上安电厂 | Heat supply system economic operation analysis method based on exhaust steam condenser |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111365750B (en) | 2021-05-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111365750B (en) | Overall operation optimization method based on three-stage cascade heat supply system | |
| CN113255160B (en) | Low-vacuum heat supply operation backpressure optimizing system and method for direct air cooling unit | |
| CN109325255B (en) | Optimal vacuum on-line guiding system of wet cooling steam turbine based on fixed power | |
| CN108564210B (en) | Resistance optimization debugging method for cooling water circulation system | |
| CN111581821B (en) | Heating unit peak regulation capacity determining method based on actually measured performance parameters | |
| CN115200064B (en) | Adjusting method of heating system combining vapor compressor with high back pressure heating | |
| CN113719325A (en) | Improvement method for variable back pressure characteristic test of steam turbine | |
| CN111520203A (en) | Steam turbine body and heat recovery system integrated comprehensive efficiency improving system and method under steam parameter improving condition | |
| CN110671741A (en) | High back pressure heat supply safety monitoring method for direct air cooling unit | |
| CN113107623A (en) | Device and method for improving heat supply steam extraction parameters during low-load operation of double-low-pressure-cylinder steam turbine | |
| CN112231908B (en) | Method for determining upper and lower load limits corresponding to extraction flow of extraction condensing unit | |
| CN210768938U (en) | High back pressure heat supply and monitoring system of large-scale turbo generator set | |
| CN216554044U (en) | 600MW unit steam-heat output integrated device | |
| CN110578561A (en) | Minimum safe flow calculation method for unit operation low pressure cylinder under different steam and backpressure | |
| CN214660397U (en) | Device for improving heat supply steam extraction parameters during low-load operation of double-low-pressure-cylinder steam turbine | |
| CN212479352U (en) | Steam turbine body and backheating system integrated comprehensive efficiency improving system under steam parameter improving condition | |
| CN111396146B (en) | Performance test and analysis calculation method for steam turbine heat supply steam extraction main pipe with multiple back pressing machines | |
| CN111706898B (en) | Method for improving heat supply capacity of unit after high-back-pressure heat supply transformation | |
| CN109814641B (en) | Economic adjustment method for cold end of wet cooling unit of thermal power plant | |
| CN110131919B (en) | Method for recovering waste heat of cooling circulating water | |
| CN111260139B (en) | Optimization method of industrial circulating water system | |
| CN215804749U (en) | Zero-output condensate water deoxygenation system for low-pressure cylinder of steam turbine | |
| CN114961890B (en) | Sliding pressure operation optimization method for steam turbine unit in heat supply period | |
| CN114922706B (en) | Method for determining minimum technical output characteristic of extraction condensing heat supply unit in low-pressure cylinder zero-output operation mode | |
| CN113915117B (en) | Effect evaluation method for changing electric water supply pump into steam pump |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210825 Address after: 1507, building 24, Yiyuan, Anhui Beili, Chaoyang District, Beijing 100101 Patentee after: Huang Zhikun Address before: 101300 room 222, 2 / F, 01-6 / F, building 4, courtyard 9, Linhe Avenue, Renhe Town, Shunyi District, Beijing Patentee before: Sheng Yuan hi tech (Beijing) Technology Co.,Ltd. |