CN107956524A - Steam power system and coal-to-olefin chemical system - Google Patents
Steam power system and coal-to-olefin chemical system Download PDFInfo
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- CN107956524A CN107956524A CN201610908351.1A CN201610908351A CN107956524A CN 107956524 A CN107956524 A CN 107956524A CN 201610908351 A CN201610908351 A CN 201610908351A CN 107956524 A CN107956524 A CN 107956524A
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- 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
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- 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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a kind of steam power system and coal-to-olefin chemical system, steam power system includes boiler and steam turbine with reheat system, steam turbine includes the high pressure cylinder of connection driving electrical power generators, the initial steam supply high pressure cylinder acting that boiler produces, steam exhaust after acting flows back into reheat system and reheated steam is formed after heating, and reheated steam is supplied in the technique turbine systems (7) of chemical system.Supply technique turbine systems after remainder reheated steam can supply and drive intermediate pressure cylinder and low pressure (LP) cylinder acting power generation.Technique turbine systems, intermediate pressure cylinder and steam exhaust caused by low pressure (LP) cylinder are condensed by condenser (11), and condensed water is used as boiler feedwater circulating reflux to boiler after heating deoxygenation via heater and oxygen-eliminating device (13)；The heat source of heater and oxygen-eliminating device comes from process steam caused by process system.The steam power system can solve the contradiction between steam production and generated energy well, realize unit " zero is spare ".
Description
Technical field
The invention belongs to chemical engineering field, and in particular, to a kind of coal-to-olefin chemical system and its steam power system
System.
Background technology
In coal-to-olefin engineering, the basic design principle of its steam power system is " electricity determining by heat ", i.e. meets work first
The steam needs of skill alkene, the initial steam that boiler produces preferably are supplied to technique turbine systems, are secondly just to provide self power generation.This
There is the requirement of harshness to the reliability of steam supply, there are following multiple problems so as to cause existing engineering：
A) parameter is low, coal consumption is high.For example, existing coal-to-olefin project scale is generally ten thousand tons of alkene/years of 50-60, full factory
Power demand is 250MW, and 40% uses for more space division turbines.The installation scale of power generation or space division turbine is usually no more than
50MW.All in all, full factory's power scale is considerable, but the demand percentage of technique alkene is little, according to " electricity determining by heat " principle, institute
The unit scale of the generating set of use is naturally smaller, can not use high parameter boiler unit, and otherwise high steam needs to be lost a large amount of
Energy, which carries out step pressure reducing etc., can be supplied to technique turbine systems, thus general thermo-power station initial steam be only 10.0MPa,
540 DEG C or so, and backheat series is few, can not be received without reheat system, net coal consumption rate more than 450g/kWh by power grid.
B) load height, long operational time.The year run time of alkene coal engineering be generally more than 8000 it is small when, it is necessary to ensure that
The technique turbine systems moment remains on, thus steam power system load needs to be in more than 90% high level all the time, shape
Into the situation of inefficient system long-time heavy-duty service.
C) it is difficult to maximize.A main path for improving coal-to-olefin project benefit level is expansion scale, list of making thinner
Position production capacity cost and operating cost, reduce product cost.Occupy significant ratio in public work workinprocess cost, with scale
Expansion, the unit price and operating cost of public work are also declining.
The content of the invention
The purpose of the invention is to overcome using existing steam power system cannot solve well steam production and
Contradiction between generated energy and cause the problem of generated energy is low, coal consumption is high, and then one kind is provided can solve steam production well
Contradiction between amount and generated energy is so as to the steam power system with higher generated energy.
The present inventor has found that existing steam power system follows " electricity determining by heat " after further investigation
Principle, initial steam preferentially meets technique application, and then provides power generation, can so cause steam power system high pressure section operation ginseng
Number is poor, and generating efficiency is low；However, " electricity determining by heat " broken the normal procedure, and take that preferentially almost all is used to send out by initial steam
Electricity, is used for turbine by the reheated rear portion of steam exhaust after power generation again afterwards and does work to meet technique application, another part is used
After supplement generates electricity this new model, can solve well contradiction between steam parameter and steam power system efficiency and
Contradiction between steam production and generated energy.Electricity generation system uses initial steam, and turbine systems use the low-pressure steam after reheating, low
Pressure drop of the pressure reheated steam during each turbine installation of dispersed placement is delivered to is small, energy loss is small, may be such that difference
Capacity turbine can ensure higher operational efficiency, while open the yield of electric power side, avoid steam and electrical production it
Between the parameter selection that brings of close-coupled it is difficult.Based on above-mentioned discovery, the present invention is completed.
Specifically, the vapor network and supercritical unit close-coupled of the invention by coal-to-olefin, utilizes supercritical unit
The characteristics of high parameter, multistage backheat and reheating, improves the efficiency of coal-to-olefin engineering steam power system, in combination with total control
Initial steam and reheaing steam pipe, make two realized between boiler and steam turbine it is running mutually it is spare, cancellation it is special
Spare unit, cost can be reduced.The system can also make full use of the afterheat steam in coal-to-olefin technique carry out to
Water heats, and it is horizontal to reduce coal consumption.
For this reason, steam power system provided by the invention includes boiler and steam turbine, the boiler includes reheat system, institute
Stating steam turbine includes the high pressure cylinder of connection driving electrical power generators, and the initial steam that the boiler produces is supplied the high pressure cylinder and done
Work(, the steam exhaust after acting flow back into the reheat system and reheated steam are formed after heating, and the reheated steam is supplied to
In the technique turbine systems of chemical system with drive the technique turbine systems work.
Preferably, the boiler works in supercriticality.
Specifically, under the supercriticality, the initial steam temperature that the boiler produces is not less than 374.15 DEG C, pressure
It is preferably that the initial steam temperature is not less than 540 DEG C, pressure is not less than 25MPa not less than 22.13MPa.
Preferably, the temperature of the reheated steam is not less than 540 DEG C, and pressure is 3~5MPa.
Preferably, the evaporation capacity of the boiler is not less than 1000t/h.
Preferably, the steam turbine further includes the intermediate pressure cylinder and low pressure (LP) cylinder of connection driving electrical power generators, supplies the work
The reheated steam of remainder after skill turbine systems supply and drive medium pressure cylinder and low pressure (LP) cylinder acting.
Preferably, the steam power system includes multiple high pressures of multiple boilers and setting parallel with one another
Cylinder, the initial steam that multiple boilers produce collects conveying by initial steam manifold and distributes to each high pressure cylinder, multiple
The steam exhaust of the high pressure cylinder collects the respective reheat system for being delivered to multiple boilers via cold reheat main steam range,
The reheated steam that the reheat system produces is collected by high temperature reheated steam manifold to be conveyed and is sequentially allocated to the work
Skill turbine systems, intermediate pressure cylinder and low pressure (LP) cylinder.
Preferably, the steam power system is arranged so that only in the single boiler and the single high pressure cylinder operation
When, the flow for the reheated steam supplied disclosure satisfy that needed for the technique turbine systems work.
Preferably, the steam power system includes basic steam powered units and the multiple row steam of setting parallel with one another moves
Power unit, steam powered units described in each column include a boiler, a high pressure cylinder, an intermediate pressure cylinder and a low pressure (LP) cylinder, institute
Stating basic steam powered units includes basic boiler and basic high pressure cylinder,
Preferably, the steam power system further includes condenser, heater and oxygen-eliminating device, the technique turbine systems and
Steam exhaust caused by the intermediate pressure cylinder and low pressure (LP) cylinder of the steam turbine is condensed by the condenser, and condensed water is via the heater
Boiler feedwater circulating reflux is used as to the boiler after heating deoxygenation with oxygen-eliminating device；
Wherein, the heat source of the heater and oxygen-eliminating device comes from the process system caused by work process
Process steam.
Preferably, the heater includes high-pressure heater and low-pressure heater, passes through the condensed institute of the condenser
State condensed water and pass sequentially through the low-pressure heater, oxygen-eliminating device and high-pressure heater；And
The process steam includes middle pressure process steam, low pressure process steam and low low pressure process steam, the low pressure and adds
Heat source needed for hot device, oxygen-eliminating device and high-pressure heater be respectively from the low low pressure process steam, low pressure process steam and
Middle pressure process steam.
Preferably, the temperature range of medium pressure process steam, low pressure process steam and low low pressure process steam is respectively
450 ± 50 DEG C, 250 ± 50 DEG C and 200 ± 50 DEG C, pressure limit be respectively 3~5MPa, 0.8~1.5MPa and 0.3~
0.6MPa。
In addition, present invention also offers a kind of coal-to-olefin chemical system including above-mentioned steam power system.
Steam power system provided by the invention can solve between steam parameter and steam power system efficiency well
Contradiction and steam production and generated energy between contradiction, different capabilities turbine is ensured higher operational efficiency, this
Sample can not only ensure the normal operation of steam power system, additionally it is possible to improve generating efficiency, excrescent electric power can surf the Internet sale,
Form new profit.In addition, steam power system provided by the invention can also realize " zero on the premise of reliability is ensured
It is spare ", great prospects for commercial application.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Attached drawing is for providing a further understanding of the present invention, and a part for constitution instruction, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is a kind of embodiment of steam power system provided by the invention, and two boilers therein are in
Normal operating conditions；
Fig. 2 is another embodiment of steam power system provided by the invention, row steam power therein
Unit is in disorderly closedown state；
Fig. 3 is another embodiment of steam power system provided by the invention, it is compared to Fig. 1's and Fig. 2
Embodiment has the steam powered units of more multiple row, forms more powerful generating capacity.
Description of reference numerals
The first boilers of 1-；The basic boilers of 2-；The first high pressure cylinders of 3-；The basic high pressure cylinders of 4-；The first intermediate pressure cylinders of 5-；6- first is low
Cylinder pressure；7- technique turbine systems；8- initial steams manifold；9- cold reheat main steam ranges；10- high temperature reheated steams manifold；11- coagulates
Vapour device；12- low-pressure heaters；13- oxygen-eliminating devices；14- high-pressure heaters；Process steam is pressed in 15-；16- low pressure process steam；
The low low pressure process steam of 17-；1 '-the second boiler；3 '-the second high pressure cylinders；5 '-the second intermediate pressure cylinders；6 '-the second low pressure (LP) cylinders.
Embodiment
The embodiment of the present invention is described in detail below.It is it should be appreciated that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to limit the invention.
The endpoint of disclosed scope and any value are not limited to the accurate scope or value herein, these scopes or
Value should be understood to comprising the value close to these scopes or value.For number range, between the endpoint value of each scope, respectively
It can be combined with each other between the endpoint value of a scope and single point value, and individually between point value and obtain one or more
New number range, these number ranges should be considered as specific open herein.
As shown in Figure 1, the present invention provides a kind of steam power system, which includes boiler (such as Fig. 1
First boiler 1, basic boiler 2) and steam turbine, boiler includes reheat system, and steam turbine includes connection driving electrical power generators
High pressure cylinder (i.e. the first high pressure cylinder 3, basic high pressure cylinder 4), the initial steam supply high pressure cylinder acting that boiler produces, high pressure cylinder driving hair
Electric unit generation, the steam exhaust after high pressure cylinder acting flow back into reheat system and reheated steam, reheated steam are formed after heating
Supplied in the technique turbine systems 7 of chemical system to drive the technique turbine systems 7 to work.
The inventive concept of the present invention is the lance existing for existing steam power system between steam production and generated energy
Contradiction between shield and parameter and efficiency.That is, it is preferentially used for meeting technique according to the existing principle of " electricity determining by heat ", initial steam
Using, and initial steam needed for technique is few, pressure is low, so as to cause the unit small scale of boiler, the high pressure section of steam power system
Parameter difference, generating efficiency is low, and each grade steam production is uneven, often exceeds technique productions institute expense, causes steam
It can not utilize and be discharged in vain.Typically, improve steam parameter, be to improve steam power system effect using supercritical system
The common method of rate, but in chemical system such as coal-to-olefin engineering, it generates electricity and space division, turbine (turbine) device disperse
Arrangement, unit small scale, the simple raising for improving parameter and being unfavorable for efficiency of turbine on the contrary, i.e., the initial steam of high pressure is in delivery pipe
Constantly decompression, loss of energy in road, until be transported in scattered each turbine installation, thus boiler should not also be operated in it is overcritical
State.
For this reason, the present invention changes the principle of " electricity determining by heat " first, unit parameter is improved, using the list with reheat system
The sweeping boiler of machine, rather than the boiler of the unit small scale without reheat system in existing steam power system.Will
For the initial steam almost all of high pressure for power generation, the steam exhaust after high pressure cylinder acting passes through the reheated steam of the low pressure formed after reheating
Used for technique turbine systems 7, used so as to fulfill the ladder of steam, both met needed for chemical system, and also improved generated energy, very
The contradiction between the contradiction and parameter and efficiency between above-mentioned steam production and generated energy is solved well.Specifically, exist
In the present invention, since initial steam is not supplied directly into technique turbine systems 7, thus the sweeping boiler of unit can output higher
Pressure, the initial steam of high yield, greatly improve generated energy, are allowed to be limited from chemical system, while the reheated steam of low pressure can expire
The lasting normal work of sufficient technique turbine systems 7, vapor transmission energy consumption is low, and the drive efficiency of technique turbine systems 7 is improved.Phase
Compared with the prior art, initial steam pressure is improved, also improves the service efficiency of steam, reduces coal consumption.
In the present invention, farthest to provide high steam, boiler is preferably operable in supercriticality, i.e. output
The supercritical steam of high pressure.This super critical boiler is known to the skilled person, and therefore not to repeat here.Using overcritical skill
Art can substantially reduce coal consumption for power generation, improve unit efficiency, the generated energy of generating set is ensureing outside the use of process system, more
Remaining electricity can be sent outside by power grid.In general, in the supercritical state, the initial steam that boiler produces exceedes the critical point of water, i.e., it is new
Vapor (steam) temperature is not less than 374.15 DEG C, and pressure is not less than 22.13MPa.In the present embodiment, initial steam temperature is preferably not small
It is not less than 25MPa in 540 DEG C and pressure, and the temperature of reheated steam is preferably again 540 DEG C, pressure 3-5MPa, but this hair
It is bright to be not limited to this.
It is further to note that as will be addressed below, single boiler, which should be able to produce, meets technique turbine systems 7
Reheated steam amount, and reheat system is should also have to realize backheat, thus the evaporation capacity of the boiler of the present invention is usually not less than
1000t/h, to meet needs.
Steam turbine also typically includes the intermediate pressure cylinder and low pressure (LP) cylinder of connection driving electrical power generators.In the present invention, it is into one
Step realizes that the reheated steam for the remainder that the ladder of steam uses, after supply technique turbine systems 7 supplies and drives intermediate pressure cylinder
Do work with low pressure (LP) cylinder.On the basis of i.e. reheated steam preferentially meets needed for technique turbine systems 7, remaining reheated steam provides hair
Electricity, is utilized with reaching the comprehensive of the steam of all pressure stages.
Referring to Fig. 1 to Fig. 3, steam power system of the invention generally includes the multiple of multiple boilers and setting parallel with one another
High pressure cylinder, the initial steam that multiple boilers produce collect conveying by initial steam manifold 8 and distribute to each high pressure cylinder, multiple high pressures
The steam exhaust of cylinder collects the respective reheat system for being delivered to multiple boilers via cold reheat main steam range 9, what reheat system produced
Reheated steam is collected by high temperature reheated steam manifold 10 to be conveyed and is sequentially allocated to technique turbine systems 7, intermediate pressure cylinder and low pressure
Cylinder.
Wherein on the basis of reliability is ensured, the present invention can accomplish " zero is spare " of boiler controller system as far as possible, with fine
Ground solves the contradiction between unit reserve quantity and installed capacity in existing steam power system.Existing general thermo-power station
Unit is typically configured to three standby or four is standby with one with one, and spare capacity is 1/3 to the 1/4 of rated capacity.With full factory rules and regulations mould
Expand and the raising of parameter, the unit scale of steam power system will also increase, configuration quantity will be reduced, if still retaining one
Backup unit, then spare capacity be likely to be breached 1/2 to the 1/1 of rated capacity, be not to one's profit in Technological Economy.In the present invention
In, due to there is provided more larger boiler controller systems of unit, accordingly reducing boiler quantity, and since unit scale is big,
The tolerance foot of the initial steam of output so that under the operating mode of Fig. 2, only when single boiler and single high pressure cylinder are run, supplied
Reheated steam flow also disclosure satisfy that technique turbine systems 7 work needed for, i.e. 1 failure of the first boiler or when overhauling, substantially
Boiler 2 can ensure the normal operation of steam power system.At the same time in other nominal situations, such as multiple boilers in Fig. 1, Fig. 3
Working status is can be at, unit can be avoided to leave unused, full production, increasing electricity output.
In order to realize bigger generated energy on the basis of ensureing needed for chemical system, steam power system of the invention can wrap
Including can independently meet that technique turbine systems 7 work required basic steam powered units and the multiple row steam of setting parallel with one another
Power unit, basic steam powered units include basic boiler 2 and basic high pressure cylinder 4, and each column steam powered units include one
Boiler, a high pressure cylinder, an intermediate pressure cylinder and a low pressure (LP) cylinder, such as Fig. 1 include the first high pressure cylinder 3, the first intermediate pressure cylinder 5, the
One row steam powered units of one low pressure (LP) cylinder 6 composition, Fig. 3 may additionally include for example by the second boiler 1 ', the second high pressure cylinder 3 ', the
Other more multiple row steam powered units of the composition such as two intermediate pressure cylinders 5 ' and the second low pressure (LP) cylinder 6 '.In this way, can be set as desired,
Start more multiple row steam powered units, to form more powerful generating capacity.
To realize water circulation use, feed heating system is further included in steam power system of the invention, it includes condensing
Steam exhaust caused by the intermediate pressure cylinder and low pressure (LP) cylinder of device 11, heater and oxygen-eliminating device 13 etc., technique turbine systems 7 and steam turbine passes through
Condenser 11 condenses, and condensed water is used as boiler feedwater circulating reflux to boiler after heating deoxygenation via heater and oxygen-eliminating device 13.
Wherein, the heat source of heater and oxygen-eliminating device 13 is particularly to caused technique is steamed in work process from process system
Vapour, to realize the heat recovery of process steam, reduces the pumping of the existing high steam to high pressure cylinder, realizes the steam of system
Balance.Wherein, the effect of the condenser 11 is that the low-pressure steam from low pressure (LP) cylinder and technique turbine systems 7 is condensed into water,
And the effect of oxygen-eliminating device 13 is will to remove or reduce water oxygen, both specific species and structure are also people in the art
Known in member, therefore not to repeat here.
Specifically, it is well known by those skilled in the art that heater can be divided into the high-pressure heater 14 of diagram and low pressure adds
Hot device 12, low-pressure heater 12, oxygen-eliminating device 13 and high-pressure heater 14 are passed sequentially through by the condensed condensed water of condenser；And
And classified according to the pressure size of process steam, process steam may include middle pressure process steam, low pressure process steam and low pressure
Process steam, the heat source needed for low-pressure heater 12, oxygen-eliminating device 13 and high-pressure heater 14 are correspondingly respectively from low pressure
Process steam 17, low pressure process steam 16 and middle pressure process steam 15.
The temperature range of above-mentioned middle pressure process steam, low pressure process steam and low low pressure process steam is respectively preferably
450 ± 50 DEG C, 250 ± 50 DEG C and 200 ± 50 DEG C, pressure limit be respectively preferably 3~5MPa, 0.8~1.5MPa and 0.3~
0.6MPa.In the present embodiment as a specific example, above-mentioned middle pressure process steam, low pressure process steam and low low pressure process steam
The temperature of vapour is respectively 450 DEG C, 250 DEG C and 200 DEG C, and pressure is respectively 3~5MPa, 1.1MPa and 0.45MPa.But this temperature,
Pressure parameter is only enumerated, and the present invention is not limited thereto.
Above-mentioned steam power system is suitable for large-scale coal-to-olefin chemical system, steam power system driving generator
Group generates electricity and provides driving steam for the technique turbine systems in coal-to-olefin design library part editor and reuse, and generating set is coal-to-olefin engineering
Device provides supply of electric power.The design of steam power system is it is ensured that the stage such as the balance of steam pipe network at different levels and startup-shutdown
Steam is supplied, therefore after the steam power system of the application present invention, can meet electric power, the steam power of coal-to-olefin chemical system
Demand, or even can also outwards supply more electricity.In addition, also preferential safeguards system balance of steam, the unnecessary or electric power that lacks
Transportation problem is solved by outer net.In normal course of operation, the unnecessary process steam of pipe network can heat system by above-mentioned feedwater
System recycling, efficiently uses the heat of coal-to-olefin technical process generation, and coal-to-olefin technique and above-mentioned steam power system is complete
U.S.A is combined together.
The steam power system of the present invention is described in detail in a manner of specific embodiment below with reference to attached drawing.
As shown in Figure 1, the steam power system includes boiler, steam turbine, technique turbine systems 7, condenser 11, low pressure
Heater 12, oxygen-eliminating device 13 and high-pressure heater 14, wherein, the boiler includes the first boiler 1 and basic boiler 2 in parallel,
And first boiler 1 and basic boiler 2 be super critical boiler, the steam turbine includes the first high pressure cylinder 3 in parallel and substantially high
Cylinder pressure 4, the first intermediate pressure cylinder 5 and the first low pressure (LP) cylinder 6.Wherein, the low-pressure heater 12, oxygen-eliminating device 13 and the institute of high-pressure heater 14
The heat source needed is respectively from the low low pressure process steam 17 produced during coal-to-olefin, low pressure process steam 16 and middle pressure work
Skill steam 15.
Wherein, the first boiler 1 and basic boiler 2 are operated in supercriticality, and the supercritical steam that it is exported is by initial steam
Manifold 8 is transported to the first high pressure cylinder 3 and basic high pressure cylinder 4 drives technique turbine systems 7 to do work.First high pressure cylinder 3 and substantially high
The steam exhaust that cylinder pressure 4 produces is transmitted back to the reheat system of the first boiler 1 and basic boiler 2 through cold reheat main steam range 9, is heated to
It is saturating into the first intermediate pressure cylinder 5 and the first low pressure (LP) cylinder 6 and technique by the distribution of high temperature reheated steam manifold 10 after reheat steam temperature
Flat system 7.Reheated steam is distributed preferentially to meet the needs of technique turbine systems 7 as principle.First intermediate pressure cylinder 5, the first low pressure
The steam exhaust of cylinder 6 and technique turbine systems 7 is after condenser 11 condenses successively by low-pressure heater 12, oxygen-eliminating device 13, high pressure
Heater 14 carries out feedwater heating, and is sent into the first boiler 1 and the production supercritical steam of basic boiler 2.Low-pressure heater 12, remove
Heat source needed for oxygen device 13, high-pressure heater 14 is respectively from the middle pressure process steam produced in coal-to-olefin technical process
15th, low pressure process steam 16, low low pressure process steam 17.
As shown in Fig. 2, in the case of separate unit boiler failure, the first boiler 1, the first high pressure cylinder 3, the first intermediate pressure cylinder 5 and
One low pressure (LP) cylinder 6 is shut down, and the reheated steam flow produced through basic boiler 2 and basic high pressure cylinder 4 still is able to ensure technique turbine system
Needed for system 7.Wherein, the first high pressure cylinder 3, basic high pressure cylinder 4, the first intermediate pressure cylinder 5 and the first low pressure (LP) cylinder 6 are respectively or joint driving is sent out
Motor produces electric power, is used for coal-to-olefin engineering, and excrescent electric power can be sent outside.
As shown in figure 3, on the basis of more than, can also increase one or more columns per page by the second boiler 1 ', the second high pressure cylinder 3 ',
Second intermediate pressure cylinder 5 ' and the second low pressure (LP) cylinder 6 ' composition d steam powered units, form the power capacity of bigger.
Above-mentioned steam power system coupling is applied in the coal-to-olefin technique of 1,200,000 tons/year of scales.Each parameter therein
Configuration is as follows：
Initial steam pressure：24MPa；
Initial steam temperature：560℃；
Initial steam flow：2×1050t/h；
Reheated steam pressure：5MPa；
Reheat steam temperature：560℃；
Reheated steam flow：2×1050t/h；
High pressure cylinder is contributed：105MW；
The output of intermediate pressure cylinder and low pressure (LP) cylinder：245MW；
The output of technique turbine systems 7：245MW.
It is horizontal according to current power station technology, supercritical unit is configured, can be with using 24MPa, 560 DEG C or so of steam
The net coal consumption rate for reaching 320g/kwh or so is horizontal.The coal-to-olefin process system that maximizes is overcritical using two 350MW scales
Unit, configures the auxiliary system such as two super critical boilers and steam-operating feedwater.Steam Turbine by two output 105MW high pressure cylinder,
In one output 245MW, low pressure (LP) cylinder composition.It is coupled to each other between unit using piping-main scheme, is configured with initial steam main pipe 8, low temperature
Reheated steam main pipe 9, high temperature reheated steam main pipe 10, condensation water main pipe etc..The design rating of high, medium and low cylinder pressure is according to 3：3：4
Left and right configures.
24MPa, the 560 DEG C of steam about 2100t/h provided with reference to Fig. 1, two boilers, after initial steam manifold 8 respectively
It is sent into the high pressure section (i.e. the first high pressure cylinder 3 and basic high pressure cylinder 4) of two units, every section of output 105MW, the 5MPa of discharge or so
Steam exhaust enters cold reheat main steam range 9.Steam after boiler reheating through high temperature reheated steam manifold 10 by distributing, part stream
Measure in the reheated steam entrance for 1050t/h, low pressure stage (i.e. the first intermediate pressure cylinder 5 and the first low pressure (LP) cylinder 6) persistently does work, output
245MW, is ultimately discharged into condenser 11；The reheated steam of another part 1050t/h enters plant area's fecder system network, in space division and technique
Do work 245MW at turbine, and condensation water returns to the feed heating system of steam power system.The low pressure steam that process system provides
It can be used for feed heating system backheat, reduce unit steam extraction amount (i.e. the steam extraction amount of high pressure cylinder steam).Open, shutdown phase
Steam demand is by the reheated steam of unit with, low pressure (LP) cylinder steam extraction offer.Under normal work, full factory's power generation scale is 105 × 2+
245=455MW, use by oneself 200MW, and 255MW is sent in online outside.Shaft system arrangement can use the biaxial system that two-shipper group is respectively configured,
Wherein the basic unit comprising basic boiler 2 only has high pressure cylinder, its all reheated steam is discharged into process steam pipe network driving work
Skill turbine systems 7 use.
In the case of single unit failure or maintenance, with reference to Fig. 3, steam generator system contributes and is reduced to 1050t/h.Close one
Platform high pressure section, all initial steams do work merely through a high pressure section (i.e. basic high pressure cylinder 4), output 105MW, and steam is complete after reheating
Portion enters fecder system network, 7 output 245MW of driving technique turbine systems, it is ensured that the normal operation of technique productions.Unit operation
Lower power generation scale is 105MW, electric power notch 95MW, need to input and solve from power grid.By reducing steam pipe network backheat flow, adjusting
Boiler load, steam turbine high pressure cylinder steam extraction pressure and temperature reducing reduce the process system load of 5-10% and ensure that steam pipe network is put down
Weighing apparatus.
It is former according to " electricity determining by heat " according to existing steam power system in the comparable comparative example shown in table 1 below
Then, produce and above-described embodiment is roughly the same or similar initial steam flow, preferably satisfy needed for technique turbine systems 7.For this reason,
Comparative example uses three boiler controller systems with a standby unit small scale of totally 8, and every boiler controller system works in non-supercritical shape
State.When applying equally to the coal-to-olefin engineering of 1,200,000 tons/year of scales, parameter such as table 1 below is obtained.
Table 1
Note 1：It by full factory's power demand conversion is coal consumption in the case of electricity demanding that conversion net coal consumption rate, which is,
As can be seen from the above results, steam power system can not only be ensured using steam power system provided by the invention
The normal operation of system, additionally it is possible to improve generating efficiency, excrescent electric power can surf the Internet sale, form new profit.It is in addition, of the invention
The steam power system of offer can also be realized " zero is spare ", great prospects for commercial application on the premise of reliability is ensured.
The preferred embodiment of the present invention described in detail above, still, during present invention is not limited to the embodiments described above
Detail, in the range of the technology design of the present invention, a variety of simple variants can be carried out to technical scheme, this
A little simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should equally be considered as content disclosed in this invention.
Claims (13)
1. a kind of steam power system, including boiler and steam turbine, the boiler includes reheat system, and the steam turbine includes connecting
The high pressure cylinder of driving electrical power generators is connect, the initial steam that the boiler produces supplies the high pressure cylinder acting, the steam exhaust after acting
Flow back into the reheat system and reheated steam is formed after heating, the reheated steam is saturating supplied to the technique of chemical system
In flat system (7) with drive the technique turbine systems (7) work.
2. steam power system according to claim 1, wherein, the boiler works in supercriticality.
3. steam power system according to claim 2, wherein, in the supercritical state, the new steaming that the boiler produces
Stripping temperature is not less than 374.15 DEG C, and pressure is not less than 22.13MPa, is preferably that the initial steam temperature is not less than 540 DEG C, pressure
Not less than 25MPa.
4. steam power system according to claim 3, wherein, the temperature of the reheated steam is not less than 540 DEG C, pressure
For 3~5MPa.
5. steam power system according to claim 1, wherein, the evaporation capacity of the boiler is not less than 1000t/h.
6. steam power system according to claim 1, wherein, the steam turbine further includes connection driving electrical power generators
Intermediate pressure cylinder and low pressure (LP) cylinder, the reheated steam for the remainder supplied after the technique turbine systems (7) supplies and drives
Medium pressure cylinder and low pressure (LP) cylinder acting.
7. steam power system according to claim 6, wherein, the steam power system include multiple boilers and
Multiple high pressure cylinders of setting parallel with one another, the initial steam that multiple boilers produce are collected defeated by initial steam manifold (8)
Send and distribute to each high pressure cylinder, the steam exhaust of multiple high pressure cylinders and collect conveying via cold reheat main steam range (9)
To the respective reheat system of multiple boilers, the reheated steam that the reheat system produces is steamed by high temperature reheating
Vapour manifold (10), which collects, to be conveyed and is sequentially allocated to technique turbine systems (7), intermediate pressure cylinder and the low pressure (LP) cylinder.
8. steam power system according to claim 7, wherein, the steam power system is arranged so that only single
When the boiler and the single high pressure cylinder operation, the flow for the reheated steam supplied disclosure satisfy that the technique turbine
Needed for system (7) work.
9. steam power system according to claim 7, wherein, the steam power system includes basic steam power list
The multiple row steam powered units of setting first and parallel with one another, steam powered units described in each column include a boiler, a high pressure
Cylinder, an intermediate pressure cylinder and a low pressure (LP) cylinder, the basic steam powered units include basic boiler (2) and basic high pressure cylinder (4).
10. the steam power system according to any one in claim 1~9, wherein, the steam power system also wraps
Include the intermediate pressure cylinder and low pressure of condenser (11), heater and oxygen-eliminating device (13), the technique turbine systems (7) and the steam turbine
Steam exhaust caused by cylinder is condensed by the condenser (11), and condensed water heats deoxygenation via the heater and oxygen-eliminating device (13)
Afterwards as boiler feedwater circulating reflux to the boiler；
Wherein, the heat source of the heater and oxygen-eliminating device (13) comes from the process system caused by work process
Process steam.
11. steam power system according to claim 10, wherein, the heater includes high-pressure heater (14) and low
Heater (12) is pressed, the low-pressure heater (12), deoxygenation are passed sequentially through by the condensed condensed water of the condenser
Device (13) and high-pressure heater (14)；And
The process steam includes middle pressure process steam (15), low pressure process steam (16) and low low pressure process steam (17), institute
State the heat source needed for low-pressure heater (12), oxygen-eliminating device (13) and high-pressure heater (14) and be respectively from the low low pressure process
Steam (17), low pressure process steam (16) and middle pressure process steam (15).
12. steam power system according to claim 11, wherein, medium pressure process steam, low pressure process steam and
The temperature range of low low pressure process steam is respectively 450 ± 50 DEG C, 250 ± 50 DEG C and 200 ± 50 DEG C, and pressure limit is respectively 3
~5MPa, 0.8~1.5MPa and 0.3~0.6MPa.
13. a kind of coal-to-olefin chemical system, which is included according to any one in claim 1~12
The steam power system.
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| JPS54135904A (en) * | 1978-04-14 | 1979-10-22 | Hitachi Ltd | Steam turbine half-speed synchronizer |
| CN101680648A (en) * | 2007-03-20 | 2010-03-24 | 西门子公司 | The method and apparatus of resuperheat when solar energy direct boiling in solar thermal power plants |
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