CN105020026B - Combustion engine back-pressure protection device - Google Patents
Combustion engine back-pressure protection device Download PDFInfo
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- CN105020026B CN105020026B CN201510353244.2A CN201510353244A CN105020026B CN 105020026 B CN105020026 B CN 105020026B CN 201510353244 A CN201510353244 A CN 201510353244A CN 105020026 B CN105020026 B CN 105020026B
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- Prior art keywords
- flue gas
- heat exchanger
- baffle door
- flue
- condensing heat
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention discloses a kind of combustion engine back-pressure protection device, including reducing flue and booster fan.The smoke inlet of reducing flue connection flue gas condensing heat exchanger and the chimney being connected with waste heat boiler.Booster fan is in reducing flue, and the diameter of reducing flue is from chimney to the tapered change in booster fan direction.In this way, as a result of the reducing flue of tapered configuration, and the pressure at the smoke inlet for passing through booster fan increase flue gas condensing heat exchanger, the influence for overcoming flue gas resistance to increase, form relatively stable flue gas flow field.
Description
Technical field
The present invention relates to energy field, more particularly, to a kind of combustion engine back-pressure protection device.
Background technology
Fume afterheat depth recovery system is the setting deep exploitation flue gas condensing heat exchanger system after waste heat boiler, sharp
Depth heat exchange is carried out with the waste heat of the low-temperature flue gas of waste heat boiler afterbody, the low temperature exhaust heat of flue gas is displaced, for central heating.
But due to being provided with flue gas condensing heat exchanger system, flue gas resistance increase, it is difficult to maintain combustion engine back pressure in waste heat boiler afterbody
In normal level.
The content of the invention
It is contemplated that at least solves one of technical problem present in prior art.Therefore, the present invention needs offer one
Kind combustion engine back-pressure protection device.
According to the combustion engine back-pressure protection device of embodiment of the present invention, including reducing flue and booster fan.The reducing
The smoke inlet of flue connection flue gas condensing heat exchanger and the chimney being connected with waste heat boiler.The booster fan is located at the change
In the flue of footpath, the diameter of the reducing flue is set from the chimney to the tapered change in booster fan direction in the chimney
There is a first baffle door, be provided with second baffle door in the reducing flue, the exhanst gas outlet of the flue gas condensing heat exchanger is provided with the
Three baffle doors, the first baffle door, the second baffle door and the third baffle door are interlocked with the booster fan to protect
Energy quick pressure releasing when demonstrate,proving the booster fan failure；
The combustion engine back-pressure protection device include demister, the water leg that is arranged in the flue gas condensing heat exchanger and with
The water pump of the flue gas condensing heat exchanger connection, the water pump are used to supply water to the water leg, the combustion engine back-pressure protection dress
Putting also includes being used to control the water pump, the first baffle door, the second baffle door, the third baffle door and the increasing
The DCS control systems of pressure fan；
The flue gas condensing heat exchanger emergency outage type one includes：(1) the second baffle door is closed during normal operation,
(2) the third baffle door is closed during normal operation, and (3) described demister entrance flue gas temperature is more than 80 DEG C, (4) described water pump
Failure is stopped transport, and the liquid level of (5) described water leg reaches H3 values, and (6) described water leg liquid level reaches L3 values；
The condition types two of the DCS control systems emergency outage include：(1) the flue gas condensing heat exchanger dead electricity, (2)
The booster fan failure is stopped transport；
The condition types three of the DCS control systems emergency outage include：The smoke inlet of the flue gas condensing heat exchanger
Flue gas pressures be more than or equal to 500Pa, be delayed 10s；
In the condition for the DCS control system emergency outages of flue gas condensing heat exchanger emergency outage type one or described occur
During the condition types three of type two or the DCS control systems emergency outage, the DCS control systems are required to send failure letter
Number with realize automatically open up the first baffle door.
In the combustion engine back-pressure protection device of embodiment of the present invention, as a result of the reducing flue of tapered configuration,
And the pressure at the smoke inlet for passing through the booster fan increase flue gas condensing heat exchanger, overcome flue gas resistance to increase
Big influence, form relatively stable flue gas flow field.
In some embodiments, the water pump is connected with water compensating valve.
In some embodiments, the flue gas condensing heat exchanger is connected with draining valve.
In some embodiments, the combustion engine back-pressure protection device also includes in the flue gas condensing heat exchanger
Pressure sensor and temperature sensor.
In some embodiments, bypass flue is provided between the exhanst gas outlet and the smoke inlet.
In some embodiments, the bypass flue is provided with fourth gear plate door.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention is from combining in description of the accompanying drawings below to embodiment by change
Obtain substantially and be readily appreciated that, wherein：
Fig. 1 is the flue gas system schematic diagram of the combustion engine back-pressure protection device of embodiment of the present invention.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the invention, it is to be understood that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", " go up ", " under ", " preceding ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " bottom ", " interior ", " outside ", "
Clockwise the orientation of the instruction such as ", " counterclockwise " or position relationship be based on orientation shown in the drawings or position relationship, merely to
Be easy to the description present invention and simplify description, rather than instruction or imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second " are only
For descriptive purposes, and it is not intended that instruction or hint relative importance or the implicit number for indicating indicated technical characteristic
Amount.Thus, define " first ", the feature of " second " can be expressed or it is hidden close include one or more spy
Sign.In the description of the invention, " multiple " are meant that two or more, unless otherwise specifically defined.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected.Can
To be mechanical connection or electrical connection.Can be joined directly together, can also be indirectly connected by intermediary, Ke Yishi
The connection of two element internals or the interaction relationship of two elements.For the ordinary skill in the art, can be with
The concrete meaning of above-mentioned term in the present invention is understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature its " upper " or it " under "
Can directly it be contacted including the first and second features, it is not directly to contact but pass through it that can also include the first and second features
Between other characterisation contact.Moreover, fisrt feature second feature " on ", " top " and " above " include first spy
Sign is directly over second feature and oblique upper, or is merely representative of fisrt feature level height and is higher than second feature.The-feature is
Two features " under ", " lower section " and it is " following " including fisrt feature directly over second feature and oblique upper, or be merely representative of the
One characteristic level is highly less than second feature.
Following disclosure provides many different embodiments or example is used for realizing the different structure of the present invention.For letter
Change disclosure of the invention, hereinafter the part and setting of specific examples are described.Certainly, they are only example, and
Purpose does not lie in the limitation present invention.In addition, the present invention can in different examples repeat reference numerals and/or reference letter, this
Kind repeats to be the relation between itself not indicating discussed various embodiments and/or setting for purposes of simplicity and clarity.
In addition, the invention provides various specific techniques and material examples, but those of ordinary skill in the art will be appreciated that
To the application of other techniques and/or the use of other materials.
The fume afterheat that combustion engine back-pressure protection device 10 disclosed by the invention is applied to larger gas cogeneration units is deep
Recovery system is spent, to ensure that combustion engine back pressure can maintain safe range when fume afterheat depth recovery system breaks down
It is interior.
Referring to Fig. 1, combustion engine back-pressure protection device 10 includes reducing flue 12, booster fan 14, bypass flue 36, first
Baffle door 22, second baffle door 24, third baffle door 26, temperature sensor, pressure sensor, DCS control systems.
Reducing flue 12 connects the chimney 20 of vertical cylinder shape and the smoke inlet 160 of flue gas condensing heat exchanger 16.Chimney
20 connect waste heat boilers 18 to receive the low-temperature flue gas of the afterbody of waste heat boiler 18.Low-temperature flue gas enters reducing flue through chimney 20
12, then flow into and condensing heat-exchange is carried out in flue gas condensing heat exchanger 16, finally it is back in chimney 20 and discharges again.Reducing flue 12 is horizontal
To arrangement, section of the reducing flue 12 between second baffle door 24 and booster fan 14 is in tapered configuration, to increase flue gas pressure
Power is so as to overcoming flue gas resistance.
Booster fan 14 is located in reducing flue 12, close to the smoke inlet 160 of flue gas condensing heat exchanger 16.Booster fan
14 be slow-speed of revolution blower fan and adjusting rotor blade, on the premise of realizing that exhaust gas volumn is variable.Improve the stability of equipment.Booster fan
14 be the key equipment for ensureing the stability of flue gas condensing heat exchanger 16.To avoid booster fan 14 from the one hand because dead electricity is stopped transport
First baffle door 22 is opened to ensure that combustion engine back pressure is no more than the limit value of setting, on the other hand, when the failure of booster fan 14 is stopped transport
When, the movable vane angle adjustment of booster fan 14 to maximum angle to reduce flow passage resistance as far as possible, should be reduced and combustion engine is carried on the back
The influence of pressure.
Smoke inlet 160 and exhanst gas outlet 162 that cigarette road 36 connects flue gas condensing heat exchanger 16 are bypassed, bypass cigarette road 36 is in
Vertical cylinder shape.
First baffle door 22 is in chimney 20, and second baffle door 24 is in reducing flue 12 and located at chimney 20 with increasing
Between pressure fan 14, at the exhanst gas outlet 162 of flue gas condensing heat exchanger 16, fourth gear plate door 28 is located at third baffle door 26
Bypass in cigarette road 36, first baffle door 22, second baffle door 24, third baffle door 26 and fourth gear plate door 28 and booster fan 14
Interlocking.First baffle door 22, second baffle door 24, third baffle door 26 and fourth gear plate door 28 are arranged to 10s and open baffle door soon
22.First baffle door 22, second baffle door 24, third baffle door 26 and fourth gear plate door 28 are baffle plate door system.
Second baffle door 24 is in opening in flue gas condensing 16 normal operation of heat exchanger with third baffle door 26, increases
The normal operation of pressure fan 14, first baffle door 22 and fourth gear plate door 28 are closed, and at least a water pump 30 is run.
Water pump 30, first baffle door 22, second baffle door 24, third baffle door 26, the on off state of fourth gear plate door 28 and booster fan
14 running status is shown in system operatio platform by DCS control systems.The switch of second baffle door 24 and third baffle door 26
Baffle system seal fan stops when baffle door system sealing blower fan start and stop interlocking, flue gas condensing 16 normal operation of heat exchanger.
Under the normal running (operation) conditions of flue gas condensing heat exchanger 16, the neat stress temperature at the exhanst gas outlet 162 of flue gas condensing heat exchanger 16 is low
Limit value is set in demister normal operation.
The emergency outage type one of flue gas condensing heat exchanger 16：
(1) second baffle door 24 is closed during normal operation；
(2) third baffle door 26 is closed during normal operation；
(3) 80 DEG C of demister entrance flue gas temperature ＞；
(4) all failures of water pump 30 are stopped transport；
(5) liquid level of water leg 164 reaches H3 values；
(6) liquid level of water leg 164 reaches L3 values；
Wherein, flue gas condensing heat exchanger 16 is provided with three high liquid level warning points, respectively H1, H2 and H3.Work as flue gas condensing
When the liquid level of heat exchanger 16 reaches H1, high liquid level warning signal is sent.When the liquid level of flue gas condensing heat exchanger 16 reaches H2, sending
Start blowoff valve blowdown 15min while high liquid level warning signal, to reduce liquid level.When the liquid level of flue gas condensing heat exchanger 16 reaches
During H3, high liquid level warning signal is sent, due to H3 ＞ H2, now blowoff valve has already turned on, and is reached to avoid liquid level from further raising
During to H3, draining valve 34 is opened, and performs the operation opened first baffle door 22 and stop speedup blower fan 14.
The liquid level of flue gas condensing heat exchanger 16 is provided with three low liquid level warning points, is L1, L2 and L3 respectively.When flue gas condensing changes
When the hot liquid level of device 16 reaches L1, low liquid level warning signal is sent.When the liquid level of flue gas condensing heat exchanger 16 reaches L2, low liquid is sent
Start the moisturizing 15min of water compensating valve 32 while the alarm signal of position, to improve liquid level.When liquid level reaches L3, low liquid level report is sent
Alert signal, due to L3 ＜ L2, now water compensating valve 32 has been opened, and to avoid harm of the further reduction of liquid level to water pump 30, is needed
Carry out flue gas system and the shutdown operation of water pump 30.
When flue gas condensing heat exchanger 16 meets any of the above-described condition, emergency outage protection order is as follows：
(1) first baffle door 22 is opened；
(2) 5S that is delayed closes booster fan 14；
(3) for the non-closing fault of second baffle door 24, second baffle door 24 is closed；
(4) for the non-closing fault of third baffle door 26, third baffle door 26 is closed；
(5) baffle door system sealing blower fan is started
The condition types two that system emergency is stopped transport：
(1) dead electricity of flue gas condensing heat exchanger 16；
(2) failure of booster fan 14 is stopped transport；
The condition types two stopped transport for system emergency, meet any of the above-described condition, and emergency outage order is：
(1) first baffle door 22 is opened；
(2) only retain a water pump 30 to run；
Emergency outage condition types two will cause booster fan 14 to be stopped transport, and now need to send supercharging wind to DSC control systems
The stoppage in transit signal of machine 14 ensures that combustion engine back pressure is no more than the limit value of setting to start first baffle door 22.Open first baffle door 22
Afterwards, it is ensured that flue gas condensing heat exchanger is carried out according to the maintenance and operation program of flue gas condensing heat exchanger 16 in the case of Host Security
The inspection and reparation of 16 systems.
The petrol station of booster fan 14 and executing agency use dual power supply, can be standby by cutting soon when there is mains power failure
With power supply, ensure the power supply safety of petrol station and executing agency, so as to be the movable vane standard-sized sheet creation when dead electricity of booster fan 14 is stopped transport
Condition.
The condition types three that system emergency is stopped transport：
Flue gas pressures >=500Pa of the smoke inlet 160 of flue gas condensing heat exchanger 16, be delayed 10s.
For meet system emergency stop transport condition types three when, emergency outage order be：
First baffle door 22 is opened.
For above-mentioned three classes emergency outage, first baffle door 22 is all referred to.Controlled in view of first baffle door 22 by DCS and be
System control, therefore be required to DCS control systems when any of the above-described emergency outage condition occurs and send fault-signal realization automatically
Open first baffle door 22 to operate, avoid having an impact main frame operation.
According to the combustion engine back-pressure protection device 10 of embodiment of the present invention, including reducing flue 12 and booster fan 14.Become
The chimney 20 that footpath flue 12 connects the smoke inlet 160 of flue gas condensing heat exchanger 16 and is connected with waste heat boiler 18.Booster fan
14 in reducing flue 12, and the diameter of reducing flue 12 is from chimney 20 to the tapered change in the direction of booster fan 14.
In the combustion engine back-pressure protection device 10 of embodiment of the present invention, as a result of the reducing flue 12 of tapered configuration,
And the pressure at the smoke inlet 160 for passing through the increase flue gas condensing of booster fan 14 heat exchanger 16, overcome what flue gas resistance increased
Influence, form relatively stable flue gas flow field.
In the present embodiment, first baffle door 22 is provided with chimney 20, second baffle door 24 is provided with reducing flue 12,
The exhanst gas outlet 162 of flue gas condensing heat exchanger 16 is provided with third baffle door 26, first baffle door 22, second baffle door 24 and the 3rd
Baffle door 26 can quick pressure releasing when being interlocked with booster fan 14 to ensure 14 failure of booster fan.
In this way, by the way that booster fan 14 is acted and first baffle door 22, second baffle door 24 and third baffle door 26
Action sets chain reaction, ensures in the case of the failure of booster fan 14, quick pressure releasing, maintains combustion engine back pressure in normal level.
In the present embodiment, combustion engine back-pressure protection device 10 also includes being used to control first baffle door 22, second baffle
The DCS control systems of door 24, third baffle door 26 and booster fan 14.
In this way, first baffle door 22, second baffle door 24, third baffle door 26 and supercharging are controlled by DCS control systems
Blower fan 14 is acted to maintain combustion engine back pressure in normal level.
In the present embodiment, water leg 164 is provided with flue gas condensing heat exchanger 16, water leg 164 is connected with multiple sprays
First 166.
In this way, cold water is sprayed downwards by water leg 164 and nozzle 166 to realize that flue gas condensing exchanges heat.
In the present embodiment, flue gas condensing heat exchanger 16 is connected with the water pump 30 for being supplied water to water leg 164.
In this way, supplied water by water pump 30 to water leg 164.
In the present embodiment, water pump 30 is connected with water compensating valve 32.
In this way, water compensating valve 32 is opened when the too low water shortage of the liquid level of flue gas condensing heat exchanger 16 into flue gas condensing heat exchanger 16
Moisturizing.
In the present embodiment, flue gas condensing heat exchanger 16 is connected with draining valve 34.
In this way, the draining of draining valve 34 is opened when the liquid level of flue gas condensing heat exchanger 16 is too high to avoid flue gas condensing heat exchanger
16 liquid levels are too high.
In the present embodiment, the pressure that combustion engine back-pressure protection device 10 is also included in flue gas condensing heat exchanger 16 passes
Sensor (figure is not marked) and temperature sensor (figure is not marked).
In this way, by pressure sensor and temperature sensor detect pressure in flue gas condensing heat exchanger 16 and temperature so as to
In control combustion engine back-pressure protection device 10.
In the present embodiment, bypass flue 36 is provided between exhanst gas outlet 162 and smoke inlet 160.
In this way, when 14 failure of booster fan, pressure release section is increased by bypass flue 36, ensures combustion engine to the full extent
Back pressure is unaffected.
In the present embodiment, bypass flue 36 is provided with fourth gear plate door 28.
In this way, the logical of bypass flue 36 is controlled to close by fourth gear plate door 28.
In the description of this specification, reference term " embodiment ", " some embodiments ", " schematically implementation
The description of mode ", " example ", " specific example " or " some examples " etc. means to combine embodiment or example describe it is specific
Feature, structure, material or feature are contained at least one embodiment or example of the present invention.In this manual, it is right
The schematic representation of above-mentioned term is not necessarily referring to identical embodiment or example.Moreover, the specific features of description, knot
Structure, material or feature can combine in an appropriate manner in any one or more embodiments or example.
While embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that：
These embodiments can be carried out with a variety of changes, modification in the case of not departing from the principle and objective of the present invention, replace and become
Type, the scope of the present invention are limited by claim and its equivalent.
Claims (6)
- A kind of 1. combustion engine back-pressure protection device, it is characterised in that including：Reducing flue, the smoke inlet of the reducing flue connection flue gas condensing heat exchanger and the chimney being connected with waste heat boiler； AndBooster fan in the reducing flue, the diameter of the reducing flue is from the chimney to the booster fan side To tapered change；First baffle door is provided with the chimney, second baffle door, the flue gas condensing heat exchanger are provided with the reducing flue Exhanst gas outlet be provided with third baffle door, the first baffle door, the second baffle door and the third baffle door with it is described Can quick pressure releasing when booster fan interlocking is to ensure the booster fan failure；The combustion engine back-pressure protection device include demister, the water leg that is arranged in the flue gas condensing heat exchanger and with it is described The water pump of flue gas condensing heat exchanger connection, the water pump are used to supply water to the water leg, and the combustion engine back-pressure protection device is also Including for controlling the water pump, the first baffle door, the second baffle door, the third baffle door and the supercharging wind The DCS control systems of machine；The flue gas condensing heat exchanger emergency outage type one includes：(1) the second baffle door is closed during normal operation, (2) The third baffle door is closed during normal operation, and (3) described demister entrance flue gas temperature is more than 80 DEG C, (4) described water pump event Barrier is stopped transport, and the liquid level of (5) described water leg reaches H3 values, and (6) described water leg liquid level reaches L3 values；The condition types two of the DCS control systems emergency outage include：(1) the flue gas condensing heat exchanger dead electricity, (2) are described Booster fan failure is stopped transport；The condition types three of the DCS control systems emergency outage include：The cigarette of the smoke inlet of the flue gas condensing heat exchanger Atmospheric pressure is more than or equal to 500Pa, and be delayed 10s；In the condition types for the DCS control system emergency outages of flue gas condensing heat exchanger emergency outage type one or described occur During the condition types three of two or described DCS control system emergency outages, the DCS control systems be required to send fault-signal with Realization automatically opens up the first baffle door.
- 2. combustion engine back-pressure protection device according to claim 1, it is characterised in that the water pump is connected with water compensating valve.
- 3. combustion engine back-pressure protection device according to claim 2, it is characterised in that the flue gas condensing heat exchanger is connected with Draining valve.
- 4. combustion engine back-pressure protection device according to claim 3, it is characterised in that the combustion engine back-pressure protection device also wraps Include the pressure sensor and temperature sensor in the flue gas condensing heat exchanger.
- 5. combustion engine back-pressure protection device according to claim 1, it is characterised in that the exhanst gas outlet enters with the flue gas Bypass flue is provided between mouthful.
- 6. combustion engine back-pressure protection device according to claim 5, it is characterised in that the bypass flue is provided with fourth gear plate Door.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510353244.2A CN105020026B (en) | 2015-06-24 | 2015-06-24 | Combustion engine back-pressure protection device |
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| CN201510353244.2A CN105020026B (en) | 2015-06-24 | 2015-06-24 | Combustion engine back-pressure protection device |
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| CN105020026A CN105020026A (en) | 2015-11-04 |
| CN105020026B true CN105020026B (en) | 2017-12-22 |
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| CN107524527B (en) * | 2017-07-28 | 2024-04-26 | 华北电力大学 | Gas turbine variable back pressure transformation system applicable to combined cycle power station |
| CN110905662A (en) * | 2019-12-03 | 2020-03-24 | 西安交通大学 | Low NOX gas-steam combined cycle system and method adopting wet flue gas recirculation |
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| CN102805999B (en) * | 2012-08-23 | 2014-07-02 | 北京威肯众合环保科技有限公司 | Turbulent ball type turbocharging compound desulfurization dust removal tower |
| CN103885433B (en) * | 2014-04-03 | 2016-06-01 | 北京京桥热电有限责任公司 | Power plant produces and management control system |
| CN204254887U (en) * | 2014-11-14 | 2015-04-08 | 北京源深节能技术有限责任公司 | Based on the flue gas waste heat recovery apparatus of CHP boiler |
| CN204755084U (en) * | 2015-06-24 | 2015-11-11 | 北京源深节能技术有限责任公司 | Combustion engine backpressure protection device |
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