CN105589352B - The parallel control system and control method of vapor recompression equipment - Google Patents
The parallel control system and control method of vapor recompression equipment Download PDFInfo
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- CN105589352B CN105589352B CN201610129539.6A CN201610129539A CN105589352B CN 105589352 B CN105589352 B CN 105589352B CN 201610129539 A CN201610129539 A CN 201610129539A CN 105589352 B CN105589352 B CN 105589352B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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Abstract
The invention discloses a kind of parallel control system and control method of vapor recompression equipment, control system includes：Analytic Tower, vapor recompression equipment and its bypass, reboiler, cooler and steam-water separator, the bypass that the regulating valve of vapor recompression equipment inlet and outlet and vapor recompression equipment are provided with is related to by pipeline and control valve control connection, emphasis between each equipment.Coordinated by regulating valve and bypass shut-off valve, the target of key process parameter stable regulation under system full working scope can be realized, ensure the stable operation of long period of process unit, production cost reduces, and safety coefficient is high, brings considerable economic benefit.Using method and apparatus of the present invention, the key issue of more vapor recompression equipment parallel runnings is not only solved, and possesses the prospect in energy-conserving and environment-protective etc. across multiple industry field popularization and application.
Description
Technical field
The present invention relates to related evaporative crystallization in thermoelectricity, steel, coal, metallurgy, pharmacy, cement and petroleum chemical industry,
Drying, the regeneration of absorbent stripping, multi-phase multi-component Reaction Separation, solvent recovery, steam or exhaust steam upgrading recycle etc. technique and
The technical field of its equipment, and in particular to a kind of parallel control system and method for vapor recompression equipment.
Background technology
Steam is the stock media commonly used in industry, both can be used for indirectly heat, and and can enough directly participates in reaction, as
Reactant and thermal source, almost all it is widely used in industry-by-industry.Certainly, since steam will be counted into as a kind of raw material
Cost.With industrial progress, the linking cooperation between every profession and trade is increasingly close, and the inter-trade application of process similarity or technology are drawn
Shen, and the trend of larger-scale unit and require it is more and clearer and more definite, some script bright spots protrude technique, because of steam system after amplification
The input that need to add of uniting and lose the upper hand.Vapor recompression equipment be it is a kind of can be by low pressure or the steam of low temperature by applied mechanical
Pressurize, to reach the rotating machinery of temperature and pressure needed for technique or engineering, brought for the big process system of all kinds of steam consumption quantities
Reverse the chance of inferior position.When steam is used to be influenceed less process system by temperature, pressure as reaction raw materials, steam
Recompression equipment can effectively reduce the size of equipment, reduce land used, significantly cut down cost；Carried when steam is used for indirect heat exchange
During heat supply energy, vapor recompression equipment can lift the exhaust steam quality after heat exchange, be allowed to possess the value reused.From technique
Flow angle says that the input of vapor recompression equipment can solve the problems, such as that many process steam consumptions are high.However, engineering problem
The scope covered is wide in range more than technological process problem, and the content being related to is not limited only to the decision design of technological process, in addition to closes
The logic control of button apparatus, the technological parameter regulation of complex working condition, supporting civil engineering electric structure, Technical Economy etc.
Content.So solving the problems, such as that some processes System steam consumption is big using steam recompression technology also much needs to study
With improved place.
The design of vapor recompression equipment parallel control system and method is exactly an outstanding question.Difficult point exists
In not only vapor recompression equipment itself needs the standard for reaching the stable operation of long period, and to meet technologic two
It is required that first, the operation pressure stabilization of upstream equipment, second, the temperature, pressure of recompression equipment outlet medium is stable.The former is to be
The precondition of system stable operation, the latter is the technological requirement that down stream train normally maintains.These equipment inherently safes operate and
Ensure that this engineering problem adds difficulty to the stable double requirements of technological parameter for the parallel running of vapor recompression equipment.If
The parallel running of vapor recompression equipment occurs abnormal, gently can then cause downstream product rotten or yield reduction, heavy then upstream occur
The major accidents such as device damage, whole system unplanned shutdown, will result directly in huge economic loss.
The content of the invention
The present invention is to overcome the shortcomings of the above, there is provided one kind can keep upstream operational outfit pressure stability and can dimension
It is stable to hold recompression equipment outlet pressure medium, while ensures that product quality and yield are high, production cost is low, safety coefficient is high
The parallel control system of vapor recompression equipment.
The present invention is realized by following technical scheme：A kind of parallel control system of vapor recompression equipment, including：
Analytic Tower, the first vapor recompression equipment and the first bypass, the second vapor recompression equipment and the second bypass, the first reboiler,
Second reboiler, the first cooler, the second cooler, steam-water separator, pass through pipeline between each part and Valve controlling connects；
Wherein, Analytic Tower tower top outlet is connected in parallel the first vapor recompression equipment and its first bypass and the second vapor recompression equipment
And its second bypass entrance, the outlet of the first vapor recompression equipment and the second vapor recompression equipment is respectively with corresponding the
The entrance of one reboiler and the second reboiler connect, first bypass and second bypass outlet respectively with the first cooler and second
The entrance connection of cooler, the outlet of the first reboiler and the second reboiler enter with the first cooler and the second cooler respectively
Mouth connection, the outlet of the first cooler and the second cooler is parallel to the entrance of steam-water separator.
Wherein, the vapor recompression equipment is preferably vapour compression machine.
Wherein, the quantity of the vapor recompression equipment is two or more than three, and control principle is constant.
Wherein, first bypass and the second bypass have a respective shut-off valve, the first vapor recompression equipment with
Second vapor recompression equipment has respective inlet adjusting valve, has after first reboiler and the second reboiler respective
Regulating valve, there is respective regulating valve between the first cooler, the second cooler and steam-water separator.
Wherein, the regulating valve is the regulating valve that range of flow is wide in range and response sensitivity is high.
Wherein, the regulating valve does not limit number, is commonly referred to as single regulating valve；But when single regulating valve can not
For satisfaction, it is necessary to two even more regulating valves in parallel when requiring, i.e., described regulating valve can be single regulating valve or parallel connection
More than two regulating valves.
On the whole, it is arranged with regulating valve before and after vapor recompression equipment, the tune before and after vapor recompression equipment
Section valve controls the pressure and vapor recompression equipment outlet pressure medium of vapor recompression equipment upstream equipment respectively.
Vapor recompression equipment parallel system needs to meet two technological requirements：1）Vapor recompression equipment upstream is maintained to set
Standby pressure is constant；2）Maintain vapor recompression equipment outlet pressure medium constant.
In order to solve the vapor recompression equipment parallel running compatibling problem stable with maintaining system process parameters, the present invention
Used control method when providing a kind of parallel control system operation of vapor recompression equipment again, it mainly passes through setting
The mode of regulation bypass and setting regulation grade realizes above-mentioned technological requirement.
This control method is characterized by controls different technique by the regulating valve before and after vapor recompression equipment respectively
Parameter, while the bypass of adjusted design recompression equipment is to meet the regulation needs under different system operating mode.
The control method is described as follows:
Vapor recompression system Parallel Control needs to tackle the full working scope of plant running.Slave unit configuration on see be two or
More vapor recompression equipment parallel runnings, but actually three class operating conditions can occur because of the difference of system loading, it is respectively
More put into operation simultaneously, a part puts into operation and a part stop transport and all stop transport.Under different working conditions, hence it is evident that change is again
The total flow of compression device import.But also come into operation recompression equipment as much if total flow changes and be not added with any regulation, just
Influence whether process system.
When simultaneously under device at full capacity situation, more whole of vapor recompression equipment of recompression system all puts into operation.Upstream
The control of equipment pressure is equivalent to the control of recompression equipment importation pressure, i.e., equipment self-operating characteristic is specified.And press again
Contracting equipment exports the control of pressure medium, then closely related with the resistance of pipe system characteristic of recompression device downstream.The former only by
The constraint of condition for import, once condition for import determines, performance curve determines that, and the latter is by outlet piping and recompression
The dual restriction of equipment itself operating condition.More obvious principal and subordinate's Matching Relation be present in both.Therefore, for device at full capacity
The control method of service condition is that principal and subordinate's collocation that two regulating valves are imported and exported by recompressing equipment is acted to meet upstream
Equipment pressure and recompression equipment export the constant requirement of pressure medium.
When under device operation at part load situation, the operation for recompressing system has choice.If the recompression of input
Equipment runs total metered flow and is more than device total flow, then possibly can not meet single device operating minimum discharge requirement, influence
The normal operation and service life of equipment.If the total metered flow of recompression equipment of input is less than device total flow, whole
Flow can not export in time, be certain to the rise for causing upstream equipment pressure, until the condition of a disaster occurs.Therefore, for device part
The control method of load operating conditions is to control upstream equipment pressure by the regulating valve for the side recompression device downstream that do not put into operation,
The normal regulation of equipment is recompressed without influenceing to put into operation.
When under the situation that device vapor recompression equipment is all stopped transport, now the equipment of vapor recompression device downstream is in
Stoppage in transit state, it is no longer required in technique maintaining recompression equipment outlet pressure stable, but upstream equipment pressure also needs to control.Cause
This, is to recompress equipment by setting recompression equipment bypass duct to be shorted out for the control method that device is all stopped transport, and
And upstream equipment pressure is controlled by the regulating valve in downstream.
Further, since the device load condition that recompression equipment parallel control system needs are tackled is more, range of pressure fluctuations
Greatly, changes in flow rate section is wide, and the regulating valve type selecting of recompression equipment outlet needs to consider that adjustable range and response are widened in parallel connection
The requirement such as sensitivity.
The present invention compared with prior art, has the advantage that and had the beneficial effect that：
(1) it is difficult to ensure upstream simultaneously when solving more vapor recompression equipment parallel runnings by parallel control system
The problem of operational outfit pressure stability and recompression equipment outlet pressure medium stabilization so that steam utilization is high, required steam
The costs such as consumption are reduced, and substantially reduce production cost, while ensure the high quality and high yield of product；
(2) can be applicable in numerous industries such as exhaust-gas treatment, application prospect is extensive；
(3) after the bypass for vapor recompression equipment of arranging in pairs or groups, moreover it is possible to the design requirement under system difference operating mode is well adapted to,
The hidden danger of system equipment accident, safety coefficient height may be triggered because liquid-phase product deep reaction is rotten by eliminating.
Brief description of the drawings
A kind of vapor recompression equipment that Fig. 1 is（Referred to as MVR）Parallel control system and its operation control technique
Sketch.
Label in figure：1st, Analytic Tower, the 2, first vapour compression machine, the 3, first reboiler, the 4, first cooler, 5, carbonated drink point
From device, the 6, second vapour compression machine, the 7, second reboiler, the 8, second cooler, the 9, first bypass, the 10, second bypass, A1, the
The inlet adjusting valve of one vapour compression machine, A2, the inlet adjusting valve of the second vapour compression machine, B1, the first cooler outlet are adjusted
Save valve, B2, the index combustion fan of the second cooler, the regulating valve after C1, the first reboiler, the regulation after C2, the second reboiler
Valve, D1, the shut-off valve of the first bypass, D2, the shut-off valve of the second bypass.
Embodiment
In order to deepen the understanding of the present invention, below in conjunction with the drawings and specific embodiments, the invention will be further described
Explanation：
As shown in figure 1, a kind of parallel control system of vapor recompression equipment, vapor recompression equipment（Referred to as MVR）
Preferably vapour compression machine, the system include：Analytic Tower 1, the first vapour compression machine 2 and first the 9, second vapour compression machine of bypass
6 and second bypass the 10, first reboiler 3, the second reboiler 7, the first cooler 4, the second cooler 8, steam-water separator 5, respectively
Connected between part by pipeline and Valve controlling；Wherein, the tower top outlet of Analytic Tower 1 be connected in parallel the first vapour compression machine 2 and
Its first bypass 9 and the second vapour compression machine 6 and its entrance of the second bypass 10, the first vapour compression machine 2 and the second vapour pressure
The outlet of contracting machine 6 connects with the entrance of the corresponding reboiler 7 of first reboiler 3 and second respectively, the first bypass 9 and the second bypass
10 entrance of the outlet respectively with the first cooler 4 and the second cooler 8 is connected, and the first reboiler 3 and the second reboiler 7 go out
Entrance of the mouth respectively with the first cooler 4 and the second cooler 8 is connected, and the outlet of the first cooler 4 and the second cooler 8 is in parallel
In the entrance of steam-water separator 5；First bypass 9 and the second bypass 10 have respective shut-off valve D1, D2, the first vapour compression machine
2 and second vapour compression machine 6 there is respective inlet adjusting valve A1, A2, have after the first reboiler 3 and after the second reboiler 7
Respective regulating valve C1, C2, divide between the first cooler 4 and steam-water separator 5, between the second cooler 8 and steam-water separator 5
Ju You not regulating valve B1, B2.
As shown in figure 1, control method/technological process during a kind of parallel control system operation of vapor recompression equipment,
The main technique main flow of the parallel control system is that the not solidifying steam of the tower top of Analytic Tower 1 passes through two vapour compression machines, Liang Tai successively
Reboiler and two coolers, eventually enter into steam-water separator 5, and secondary technological process is the not solidifying steam of the tower top of Analytic Tower 1 through two
Two bypasses that vapour compression machine is correspondingly arranged are directly entered corresponding cooler, finally also enter steam-water separator 5.Controlling
In system, the valve that crucial adjustment effect is played at two is set, is the first vapor recompression equipment 2, the second vapor recompression respectively
Regulation between regulating valve A1, A2 of the import of equipment 6, and the first cooler, the second cooler cooler and steam-water separator
Valve B1, B2.It is described as follows with reference to three kinds of operating modes of system operation：
Operating mode one, the first vapour compression machine 2 and the second vapour compression machine 6 put into operation, i.e. two main technological process lines are just
Often work.Now two secondary technological process lines are the first bypass 9 and the second vapour compression machine 6 that the first vapour compression machine 2 is set
The shut-off valve D1 and D2 of the second bypass 10 set are closed, regulating valve C1 and C2 after the first reboiler 3 and the second reboiler 7
Standard-sized sheet.The not solidifying steam of tower top passes through two vapour compression machines, two reboilers and two coolers successively, regulating valve A1, B1 and
Regulating valve A2, B2 plays regulatory role to the main technological process line where itself respectively.With main technique where the first vapour compression machine 2
Exemplified by flowline：Only action A1（Change vapour compression machine operation characteristic）Although the pressure of Analytic Tower 1 can be controlled, first steams
The outlet pressure of vapour compressor 2 can change therewith；Only action B1（Change resistance of pipe system characteristic）, the first vapour compression machine can be adjusted
2 outlet pressures are up to standard, but can also change the pressure of Analytic Tower 1 simultaneously, if the pressure off-design of Analytic Tower 1 value is more, it is still necessary to return
De-regulation A1.It can be seen that the pressure of Analytic Tower 1 belongs to the upstream check point of technological process, it is necessary to mixes up, just facilitates to downstream first
Vapour compression machine outlet pressure makees Effective Regulation.So devise for vapor recompression equipment under the conditions of operating mode one and
Join control method/regulation and control scheme of control system：The pressure of Analytic Tower 1 is controlled by regulating valve A1, regulating valve B1 controls the first steam
The outlet pressure of compressor 2, based on the former, the latter it is driven, when operation fluctuation occurs in system, first adjust A1 to meet that Analytic Tower 1 is pressed
Power requirement, reoperate the B1 regulation outlet pressures of the first vapour compression machine 2, another main technique where the second vapour compression machine 6
The control methods of flowline are identical with the control methods of the main technological process line of the first vapour compression machine 2.
Operating mode two, the first vapour compression machine 2 is worked, the second vapour compression machine 6 is stopped transport, or the work of the second vapour compression machine 6
Work, the first vapour compression machine 2 are stopped transport, i.e., only one main technological process line puts into operation.At this moment steam is not coagulated because of the output of Analytic Tower 1
Total amount exceedes separate unit vapour compression machine and its corresponding reboiler, the flow restriction of cooler, now needs vapour compression machine to set
Bypass play a role.So that the first vapour compression machine 2 is put into operation, the second vapour compression machine 6 is stopped transport as an example：Now, the first vapour pressure
Second corresponding to the shut-off valve D1 closings of corresponding the first bypass 9 set of contracting machine 2 and the second vapour compression machine 6 bypasses 10
Regulating valve D2 standard-sized sheets；The inlet adjusting valve A1 standard-sized sheets of first vapour compression machine 2, interlocking are released, and the pressure of Analytic Tower 1 is transferred by second
Regulating valve B2 controls after cooler 8, and the index combustion fan B1 of the first cooler 4 still controls the first vapour compression machine 2
Outlet pressure, regulate and control by this scheme, the stable operation of the first vapour compression machine 2 can be maintained, eliminate the A1 controls of action regulating valve
Regulating valve B1 must be acted while 1 pressure of Analytic Tower to adjust the trouble of the outlet pressure of the first vapour compression machine 2, and can is effective
Maintain the pressure of Analytic Tower 1 constant.According to identical principle, when the second vapour compression machine 6 is worked, the first vapour compression machine 2 is stopped transport
When regulation and control scheme can be obtained by such scheme analogy.
Operating mode three, the first vapour compression machine 2 and the second vapour compression machine 6 are all stopped transport, regulating valve A1, C1 and regulating valve A2,
C2 is closed.The first bypass 9 and second that the not solidifying steam of the output of Analytic Tower 1 all will be set by the first vapour compression machine 2
The second bypass 10 that vapour compression machine 6 is set enters corresponding the first cooler 4 and the second cooler 8, now by regulating valve
B1, B2 control the pressure of Analytic Tower 1.
Because operating pressure fluctuation range is big, and changes in flow rate section is wide, and the type selecting of regulating valve must consider to widen regulation
Scope and the design requirement for responding sensitivity etc..
Vapor recompression equipment parallel Operation Control strategy proposed by the present invention, vapor recompression can be related to for every profession and trade and set
The control of standby parallel running system provides reference.The embodiment of the example also can be directly as the reference for solving problem.Adopt
With control strategy proposed by the present invention, it can both meet the technological requirement under each operating mode, maintain systematic parameter stable, and can is enough
Meet the needs that separate unit recompression equipment high efficiency is persistently run.All valve pipe fittings being related to all are fully utilized,
Thinking is simply clear, system safety and stability, it is clear that is a kind of strategy that can ensure great economic benefit.Also exactly therefore,
Method and apparatus of the present invention possesses the prospect in association area popularization and application.
The present invention and embodiments thereof are described above, finally it should be noted that：The description be merely to illustrate rather than
It is restricted, for the ordinary skill in the art, without departing from the principles and spirit of the present invention, can be with
A variety of change, modification, replacement and modification are carried out to these embodiments, these designed without performing creative labour with
The same or analogous structure of the technical program, device, equipment or product and its application method and/or purposes, it all should cover at this
Within the protection domain of invention.
Claims (8)
- A kind of 1. control method of the parallel control system operation of vapor recompression equipment, it is characterised in that：The Parallel Control system System, including：Analytic Tower（1）, the first vapor recompression equipment and first bypass（9）, by the second vapor recompression equipment and second Road（10）, the first reboiler（3）, the second reboiler（7）, the first cooler（4）, the second cooler（8）And steam-water separator （5）, pass through pipeline between each part and Valve controlling connect；Wherein, Analytic Tower（1）Tower top outlet is connected in parallel the first steam again Compression device and its first bypass（9）Bypassed with the second vapor recompression equipment and its second（10）Entrance, the first steam is again The outlet of compression device and the second vapor recompression equipment respectively with corresponding first reboiler（3）With the second reboiler（7）'s Entrance connects, the first bypass（9）With the second bypass（10）Outlet respectively with the first cooler（4）With the second cooler（8）'s Entrance connects, the first reboiler（3）With the second reboiler（7）Outlet respectively with the first cooler（4）With the second cooler（8） Entrance connection, the first cooler（4）With the second cooler（8）Outlet be parallel to steam-water separator（5）Entrance；Control the pressure and steam of vapor recompression equipment upstream equipment respectively by the regulating valve before and after vapor recompression equipment Equipment outlet pressure medium is recompressed, while the regulation by being bypassed to vapor recompression equipment meets under different system operating mode Regulation need；When the parallel control system oepration at full load of vapor recompression equipment, the control method is by vapor recompression equipment Principal and subordinate's collocation of two regulating valves of inlet and outlet is acted to meet the equipment pressure of upstream and vapor recompression equipment outlet medium pressure The constant requirement of power.
- 2. the control method of the parallel control system operation of vapor recompression equipment according to claim 1, its feature exist In：The quantity of described vapor recompression equipment is two or more than three.
- 3. the control method of the parallel control system operation of vapor recompression equipment according to claim 1 or 2, its feature It is：Described vapor recompression equipment is vapour compression machine.
- 4. the control method of the parallel control system operation of vapor recompression equipment according to claim 1, its feature exist In：First bypass and the second bypass have respective shut-off valve（D1、D2）, the first vapor recompression equipment and second Vapor recompression equipment has respective inlet adjusting valve（A1、A2）, have after first reboiler and the second reboiler each From regulating valve（C1、C2）, there is respective regulating valve between the first cooler, the second cooler and steam-water separator（B1、 B2）.
- 5. the control method of the parallel control system operation of vapor recompression equipment according to claim 1, its feature exist In：The front and rear of the vapor recompression equipment is arranged with regulating valve, and the regulating valve is that range of flow is wide in range and response is sensitive High regulating valve is spent, the regulating valve refers to single regulating valve or more than two regulating valves of parallel connection.
- 6. the control method of the parallel control system operation of vapor recompression equipment according to claim 1, its feature exist In：When the parallel control system operation at part load of vapor recompression equipment, by not putting into operation under the vapor recompression equipment of side The regulating valve of trip controls upstream equipment pressure, without the normal regulation for the vapor recompression equipment of influenceing to put into operation.
- 7. the control method of the parallel control system operation of vapor recompression equipment according to claim 1, its feature exist In：When the parallel control system of vapor recompression equipment is all stopped transport, by setting vapor recompression equipment bypass duct short Vapor recompression equipment is fallen on road, and controls upstream equipment pressure by the regulating valve in downstream.
- 8. the control method of the parallel control system operation of vapor recompression equipment according to claim 7, its feature exist In：When bypass, which is shorted out corresponding vapor recompression equipment, realizes the control targe under different system load, pass through cooler The regulating valve of outlet is controlled parsing pressure tower.
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| CN201610129539.6A CN105589352B (en) | 2016-03-08 | 2016-03-08 | The parallel control system and control method of vapor recompression equipment |
| PCT/CN2017/075705 WO2017152813A1 (en) | 2016-03-08 | 2017-03-06 | Parallel control system and control method for steam recompression apparatuses |
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| CN201610129539.6A CN105589352B (en) | 2016-03-08 | 2016-03-08 | The parallel control system and control method of vapor recompression equipment |
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| CN105589352B true CN105589352B (en) | 2018-01-12 |
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| CN105589352B (en) * | 2016-03-08 | 2018-01-12 | 北京国电龙源环保工程有限公司 | The parallel control system and control method of vapor recompression equipment |
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| CN105589352B (en) * | 2016-03-08 | 2018-01-12 | 北京国电龙源环保工程有限公司 | The parallel control system and control method of vapor recompression equipment |
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2016
- 2016-03-08 CN CN201610129539.6A patent/CN105589352B/en active Active
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- 2017-03-06 WO PCT/CN2017/075705 patent/WO2017152813A1/en active Application Filing
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| CN102654064A (en) * | 2012-05-15 | 2012-09-05 | 西安陕鼓动力股份有限公司 | Steam-switching control method of double-steam-admission condensing turbine |
| CN104214123A (en) * | 2013-06-05 | 2014-12-17 | 中国石油天然气股份有限公司 | Linkage control device and method for double compressors |
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| CN105589352A (en) | 2016-05-18 |
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