CN208566666U - A kind of phthalic anhydride production feed water system of boiler - Google Patents
A kind of phthalic anhydride production feed water system of boiler Download PDFInfo
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- CN208566666U CN208566666U CN201821022742.4U CN201821022742U CN208566666U CN 208566666 U CN208566666 U CN 208566666U CN 201821022742 U CN201821022742 U CN 201821022742U CN 208566666 U CN208566666 U CN 208566666U
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- pump
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- boiler
- water supply
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Abstract
The utility model provides a kind of phthalic anhydride production feed water system of boiler, desalted water water feeding tank including successively piping connection, water supply pump and boiler feedwater pipeline, it is characterized in that, it further include stand-by pump, auxiliary pump, frequency converter and controller, main line pressure sensor is provided on the water supply main line of boiler feedwater pipeline front end, the boiler feedwater pipeline includes middle pressure supply line and high-pressure feed water pipeline, the frequency converter and water supply pump, stand-by pump and auxiliary pump circuit connection, water supply pump, stand-by pump and auxiliary pump into, inlet valve and flowing water Valve are respectively arranged on water outlet.The utility model forms closed loop water supply flow control system by stand-by pump and auxiliary pump combination frequency converter and controller, main line pressure road sensor etc., realize that the actual used water demand of supply line and high-pressure feed water pipeline carries out start and stop and frequency changes to pressing in water supply pump, stand-by pump, auxiliary pump cooperation, and then adjust practical water supply flow and lift parameter, electric energy is saved, power consumption is reduced.
Description
Technical field
The utility model belongs to boiler feedwater technical field, and in particular, to a kind of phthalic anhydride production feed water system of boiler.
Background technique
Boiler feed pump is the core equipment of the moisture balance of phthalic anhydride production, is related to the lasting of production and stablizes, such as Fig. 1
It is shown, oxidation section technical process is produced for phthalic anhydride in the prior art, desalted water first passes through oxygen-eliminating device removing except oxygen, into pot
After furnace feed pump, sub-fraction desalted water goes purification F47 cooling for E41, E44, E46, E48, E52 etc. from the extraction of water pump intermediate pressure section
Device uses；In addition most of desalted water goes feedwater preheater E81, E82 to preheat, then goes gas cooler water section (gas is cold
But device back segment) further (while the temperature of cooling gas cooler outlet phthalic anhydride gas) after preheating, sub-fraction water goes middle pressure
Flash tank F83 carries out moisturizing, and in addition most of to go Steam drum F15 moisturizing, a part of water in Steam drum bottom enters gas
The cooling phthalic anhydride gas of these main heat exchange equipments of body cooler E16 and molten salt cooler E14 and oxidation reactor fused salt, maintain work
The temperature of skill process medium is stablized, and guarantees that production process persistently operates normally.
Currently, boiler feed pump selected by most of phthalic anhydride manufacturers is the centrifugation of dual-purpose high-lift multi-stage such as Fig. 2
Pump, because many-sided design factor considers, selected boiler feedwater pump discharge and lift parameter are much higher than needed for actual production, and
For power frequency work, to reduce actual water supply, the flow of water pump is controlled by return valve in reality of work operating process, so-called
Reflux, i.e., be directly connected between the intake line of pump and discharge pipeline by short duct and valve, by opening return valve
Aperture controls required flow, and the power not only pumped is big, and power consumption is big, be also easy to cause overload trip termination of pumping, exist
Security risk.
Therefore, the above problem is urgently to be resolved.
Utility model content
Purpose of utility model: for overcome the deficiencies in the prior art, the purpose of the utility model is to provide one kind based on change
The phthalic anhydride of frequency transformation produces the feed water system of boiler.
Technical solution: the utility model provides a kind of phthalic anhydride production feed water system of boiler, including successively piping connection
Desalted water water feeding tank, water supply pump and boiler feedwater pipeline, which is characterized in that be parallel between the water supply pump entery and delivery port pipeline
It is less than the auxiliary pump of water supply pump with the consistent stand-by pump of water supply water supplying pump parameter and water supply flow parameter, further includes internal PID
The frequency converter and controller of regulating device are provided with main line pressure sensing on the water supply main line of boiler feedwater pipeline front end
Device, the boiler feedwater pipeline include the middle pressure supply line and high-pressure feed water pipeline being set side by side, the frequency converter and water supply
Pump, stand-by pump and auxiliary pump circuit connection, the water supply pump, stand-by pump and auxiliary pump are into and out of being respectively arranged with into water on water end (W.E.)
Valve and flowing water Valve.
The utility model is by power frequency water supply pump pump group and setting a stand-by pump and a low discharge with lift parameter
Auxiliary pump forms closed loop water supply flow control system in conjunction with by frequency converter and controller, main line pressure road sensor, realizes pair,
Make water supply pump, stand-by pump, press in auxiliary pump cooperation the actual used water demand of supply line and high-pressure feed water pipeline carry out start and stop and
Frequency variation, and then practical water supply flow and lift parameter are adjusted, electric energy is saved, power consumption is reduced.
Further, a kind of above-mentioned phthalic anhydride produces the feed water system of boiler, which is characterized in that medium pressure supply line and
The branch pressure sensor with PID regulating device circuit connection is provided on high-pressure feed water pipeline.
Branch pressure sensor can in real time centering pressure supply line and high-pressure feed water pipeline detected, and coupled system into
Row is accurate to be adjusted.
Further, a kind of above-mentioned phthalic anhydride produces the feed water system of boiler, which is characterized in that medium pressure supply line and
The flow control valve connecting with controller circuitry is respectively arranged on high-pressure feed water pipeline.
The purpose of setting of flow control valve is that supply line and high-pressure feed water pipe is pressed to carry out assignment of traffic for centering, is prevented
Because assignment of traffic it is improper caused by water shortage or for dilutional hyponatremia, reduce failure rate and for water waste.
Further, a kind of above-mentioned phthalic anhydride produces the feed water system of boiler, which is characterized in that medium pressure supply line and
The flow sensor connecting with controller circuitry is provided in the flow control valve back end line of high-pressure feed water pipeline.
The flow sensor coupled system fact judgement in press supply line and high-pressure feed water pipeline water use variation, convenient for into
Row water supply frequency is adjusted, while the actual used water amount for being also convenient for centering pressure supply line and high-pressure feed water pipeline is recorded and examined
It surveys, the formation period is recorded with water, convenient for specific setting water supply parameter, is offered convenience to later period water use regulation.
Further, a kind of above-mentioned phthalic anhydride produces the feed water system of boiler, which is characterized in that the flowing water Valve and water supply
Check-valves is provided between the pipeline of pump, stand-by pump and auxiliary pump.
The purpose that check-valves is arranged after pump is to prevent desalination aqueous reflux, prevent pump and drive motor reversion, causes failure
And reflux.
Further, a kind of above-mentioned phthalic anhydride produces the feed water system of boiler, which is characterized in that in the desalted water water feeding tank
It is provided with the liquid level sensor connecting with controller circuitry.
Liquid level sensor perceives the water level in desalted water water feeding tank, carries out low-water alarm, prevents pump dry combustion method report
It gives up or because of insufficient water bring rear water failure in desalted water water feeding tank.
Above-mentioned technical proposal can be seen that the utility model has the following beneficial effects: the utility model passes through to power frequency
Water supply pump pump group simultaneously sets a stand-by pump and a low discharge with the auxiliary pump of lift parameter, in conjunction with by frequency converter and controller,
Main line pressure road sensor forms closed loop water supply flow control system, realizes pair, makes water supply pump, stand-by pump, in auxiliary pump cooperation
It presses the actual used water demand of supply line and high-pressure feed water pipeline to carry out start and stop and frequency variation, and then adjusts practical water supply flow
With lift parameter, electric energy is saved, reduces power consumption.
Detailed description of the invention
Fig. 1 is phthalic anhydride production water supply system schematic in the prior art；
Fig. 2 is phthalic anhydride production water supply pump group schematic diagram in the prior art；
Fig. 3 is the overall structure diagram of the utility model embodiment；
Fig. 4 is the attachment structure schematic diagram of the utility model embodiment water supply pump, stand-by pump, auxiliary pump.
Specific embodiment
The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, it is intended to for explaining the utility model, and should not be understood as to the utility model
Limitation.
In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of
Describe the utility model and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, unless otherwise indicated, the meaning of " multiple "
It is two or more, unless otherwise restricted clearly.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood as the case may be
Concrete meaning in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature the "upper" of second feature or it
"lower" may include that the first and second features directly contact, and also may include that the first and second features are not direct contacts but lead to
Cross the other characterisation contact between them.Moreover, fisrt feature includes above the second feature " above ", " above " and " above "
One feature is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.First is special
Sign is directly below and diagonally below the second feature including fisrt feature under the second feature " below ", " below " and " below ", or only
Indicate that first feature horizontal height is less than second feature.
Embodiment
A kind of phthalic anhydride as shown in the figure produces the feed water system of boiler, desalted water water feeding tank 1 including successively piping connection, simultaneously
Two water supply pumps 2 and boiler feedwater pipeline 3 of setting are arranged, are parallel with and water supply pump 2 between the 2 entery and delivery port pipeline of water supply pump
The consistent stand-by pump 21 of water supply parameter and water supply flow parameter are less than the auxiliary pump 22 of water supply pump, further include that internal PID is adjusted
The frequency converter and controller of device are provided with main line pressure sensor on the water supply main line 4 of 3 front end of boiler feedwater pipeline
10 and main line flowmeter 20, the boiler feedwater pipeline 3 includes the middle pressure supply line 31 and high-pressure feed water pipeline being set side by side
32, the frequency converter and 22 circuit connection of water supply pump 2, stand-by pump 21 and auxiliary pump, the water supply pump 2, stand-by pump 21 and auxiliary
Pump 22 is into and out of being respectively arranged with inlet valve 100 and flowing water Valve 200 on water end (W.E.).Medium pressure supply line 31 and high pressure are given
The branch pressure sensor 30 connecting with converter circuit is provided in water lines 32.
The flow connecting with controller circuitry is respectively arranged on medium pressure supply line 31 and high-pressure feed water pipeline 32
Regulating valve 300.
It is provided with and controls in 300 back end line of flow control valve of medium pressure supply line 31 and high-pressure feed water pipeline 32
The flow sensor 40 of device circuit connection processed.
Check-valves 400 is provided between the flowing water Valve 200 and the pipeline of water supply pump 2, stand-by pump 21 and auxiliary pump 22.
The liquid level sensor 5 connecting with controller circuitry is provided in the desalted water water feeding tank 1.
When work, controller control frequency converter is soft to open water supply pump 2 and corresponding inlet valve 100 and the extraction of flowing water Valve 200
Desalted water water feeding tank 1 is passed the signal along to comprehensive in PID regulating device to system water supply, branch pressure sensor 30 by circuit
Operation is judged that calculated result is transmitted to frequency converter by the detection numerical value of PID regulating device combination main line pressure sensor 10,
Frequency converter and then the running frequency for controlling water supply pump 2 adjust the size of revolving speed.
In the case of normal discharge supplies water, controller controls water supply pump 2 and stand-by pump 21 carries out 4 hours switch operatings, keeps
In the working condition that two pump, another pump is made to rest, corresponding inlet valve 100 and water outlet are closed in corresponding control
Valve 200；When water requirements increase to the water supply capacity more than two water supply pumps 2, auxiliary pump 22 is soft opens for controller control, into
Row flow supplement；When water requirements are lower, such as to during gas cooler cleaning and drying stage and parking maintenance, control
Device controls a water supply pump 2 or stand-by pump 21 works, or only opens auxiliary pump 22 in the system maintenance phase and supply water；Work as centering
When supply line 31 and high-pressure feed water pipeline 32 being pressed to carry out traffic partition, the opening degree of two flow control valves 300 is opened in control
It switches over, and the monitoring data of root bypass flow meter adjust for water inventory by frequency converter.
Specific water supply pump 2, stand-by pump 21 and 22 order of magnitude of auxiliary pump correspond to the arrangement design of valve quantity, should follow reality
Border production requirement.When water pump switching and closing, Ying Caiyong frequency conversion soft stop.
Before improving compared to frequency conversion, boiler feedwater pump pressure and flow control pass through pneumatic operated valve valve in addition to each branch line
Control is outer, and wherein pump discharge manifold pressure and flow need preliminary control, and this respect relies primarily on return valve control, is convenient for downstream
User accurately controls；
After Frequency Conversion Modification, in normal productive process, motor working frequency and revolving speed directly can control by frequency converter, into
And the numerical value that pump discharge flow and pressure are needed to feed water system of boiler general pipeline is accurately adjusted, have easy to operate, intuitive, smart
Really, the advantages that control is completed immediately, meets the needs of lean production.
By using frequency control, boiler feedwater pump discharge pressure can be reduced, and flow can reduce, normal maximum load
Frequency under operating condition is controlled in 40-43Hz, and energy-saving effect is obvious, and electric current is reduced to 200-220A from the 280A before improvement, practical
Power reduces 21-25% or so, and every covering device can save 400,000 degree of electric energy or so every year, and energy conservation is very significant；
Other than considerable energy-saving effect, after boiler feed pump Frequency Conversion Modification, there are also thoroughly eliminate water hammer effect and improvement
The advantages of water pump applying working condition.
Asynchronous motor is less than or equal to 0.5s the time required to accelerating to rated speed from stationary state in full-voltage starting.
This means that the flow of boiler feedwater surges from zero to metered flow in the time less than 0.5s.Since fluid has momentum
With a degree of compressibility, therefore the great variety of flow in a very short period of time, will cause it is excessively high to the pressure of pipeline or
Too low impact.Compression shock will make tube wall stress and generate noise, like hammer taps pipe, referred to as water hammer effect.
Water hammer effect has greatly destructive: pressure is excessively high, will cause pipe break；Conversely, pressure is too low, and can lead
Cause the collapsing of pipe.In addition, water hammer effect may also damage valve and fixing piece.
When directly shutting down, the pressure head of water system will overcome the inertia of motor and stop system sharply, in this way
It can cause compression shock and water hammer effect.
It, can be by the way that the prefabricated of acceleration time and deceleration time be extended starting and was stopped after frequency control
Journey, water pump starting at present needs 30 seconds or more from starting to rated speed, to completely eliminate water hammer effect.
The elimination of water hammer effect can undoubtedly greatly prolong the service life of water pump and pipe-line system.In addition to this, it uses
After frequency control, since water pump mean speed declines, in the course of work the reason of average torque reduction, have the advantage that
(1) more steady before water pump low speed operating ratio is improved, vibration, noise are also with reduction, the abrasion of bearing and impeller
The stress that blade is born all greatly reduces；
(2) pump of low speed operation, outlet pressure reduce, advantageous to system connection sealing, while significantly improving machinery
Applying working condition is sealed, the service life of mechanical seal is extended；
(3) equipment failure rate is lower, and maintenance workload significantly reduces, and corresponding expense of overhauling reduces, and the cost of overhaul reduces.
In short, the applying working condition of water pump is obviously improved after Frequency Conversion Modification, service life of equipment is significantly extended.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without departing from the principle of this utility model, several improvement can also be made, these improvement also should be regarded as
The protection scope of the utility model.
Claims (6)
1. a kind of phthalic anhydride produces the feed water system of boiler, desalted water water feeding tank (1), water supply pump (2) including successively piping connection and
Boiler feedwater pipeline (3), which is characterized in that be parallel between water supply pump (2) the entery and delivery port pipeline and supply water with water supply pump (2)
The consistent stand-by pump of parameter (21) and water supply flow parameter are less than the auxiliary pump (22) of water supply pump, further include that internal PID is adjusted
The frequency converter and controller of device are provided with pressure biography in main line on the water supply main line (4) of boiler feedwater pipeline (3) front end
Sensor (10) and main line flowmeter (20), the boiler feedwater pipeline (3) include the middle pressure supply line (31) being set side by side and
High-pressure feed water pipeline (32), the frequency converter and water supply pump (2), stand-by pump (21) and auxiliary pump (22) circuit connection, the confession
Water pump (2), stand-by pump (21) and auxiliary pump (22) are into and out of being respectively arranged with inlet valve (100) and flowing water Valve on water end (W.E.)
(200).
2. a kind of phthalic anhydride according to claim 1 produces the feed water system of boiler, which is characterized in that medium pressure supply line
(31) the branch pressure sensor (30) connecting with converter circuit and is provided on high-pressure feed water pipeline (32).
3. a kind of phthalic anhydride according to claim 2 produces the feed water system of boiler, which is characterized in that medium pressure supply line
(31) flow control valve (300) connecting with controller circuitry and is respectively arranged on high-pressure feed water pipeline (32).
4. a kind of phthalic anhydride according to claim 3 produces the feed water system of boiler, which is characterized in that medium pressure supply line
(31) and in flow control valve (300) back end line of high-pressure feed water pipeline (32) it is provided with the flow connecting with controller circuitry
Sensor (40).
5. a kind of phthalic anhydride according to claim 1 produces the feed water system of boiler, which is characterized in that the flowing water Valve
(200) it is provided between the pipeline of water supply pump (2), stand-by pump (21) and auxiliary pump (22) check-valves (400).
6. a kind of phthalic anhydride according to claim 1 produces the feed water system of boiler, which is characterized in that the desalted water water feeding tank
(1) liquid level sensor (5) connecting with controller circuitry is provided in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821022742.4U CN208566666U (en) | 2018-06-29 | 2018-06-29 | A kind of phthalic anhydride production feed water system of boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821022742.4U CN208566666U (en) | 2018-06-29 | 2018-06-29 | A kind of phthalic anhydride production feed water system of boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208566666U true CN208566666U (en) | 2019-03-01 |
Family
ID=65489586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821022742.4U Expired - Fee Related CN208566666U (en) | 2018-06-29 | 2018-06-29 | A kind of phthalic anhydride production feed water system of boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208566666U (en) |
-
2018
- 2018-06-29 CN CN201821022742.4U patent/CN208566666U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190301 Termination date: 20210629 |