CN105020026A - Fuel machine backpressure protection device - Google Patents
Fuel machine backpressure protection device Download PDFInfo
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- CN105020026A CN105020026A CN201510353244.2A CN201510353244A CN105020026A CN 105020026 A CN105020026 A CN 105020026A CN 201510353244 A CN201510353244 A CN 201510353244A CN 105020026 A CN105020026 A CN 105020026A
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- Prior art keywords
- flue gas
- protection device
- combustion engine
- flue
- heat exchanger
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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 fuel machine backpressure protection device. The fuel machine backpressure protection device comprises a variable diameter flue and a booster fan. The variable diameter flue is connected with a flue gas inlet of a flue gas condensing heat exchanger and a chimney which is connected with a waste heat boiler. The booster fan is arranged inside the variable diameter flue, and the diameter of the variable diameter flue contracts gradually in the direction from the chimney to the booster fan. By means of the mode, due to the fact that the variable diameter flue of the gradual contraction structure is adopted, the pressure at the flue gas inlet of the flue gas condensing heat exchanger is increased by means of the booster fan, the influence caused by increasing of flue gas resistance is overcome, and a more stable flue gas flow field is formed.
Description
Technical field
The present invention relates to energy field, especially relate to a kind of combustion engine back-pressure protection device.
Background technique
Fume afterheat degree of depth reclaiming system is after exhaust heat boiler, arrange deep exploitation flue gas condensing heat exchanger system, utilizes the waste heat of the low-temperature flue gas of exhaust heat boiler afterbody to carry out degree of depth heat exchange, displaces the low temperature exhaust heat of flue gas, for central heating.But owing to being provided with flue gas condensing heat exchanger system at exhaust heat boiler afterbody, flue gas resistance increases, be difficult to maintain combustion engine back pressure at normal level.
Summary of the invention
The present invention is intended at least to solve one of technical problem existed in prior art.For this reason, the present invention needs to provide a kind of combustion engine back-pressure protection device.
According to the combustion engine back-pressure protection device of embodiment of the present invention, comprise reducing flue and booster fan.The smoke inlet that described reducing flue connects flue gas condensing heat exchanger and the chimney be connected with exhaust heat boiler.Described booster fan is located in described reducing flue, and the diameter of described reducing flue changes from described chimney to described booster fan direction convergent.
In the combustion engine back-pressure protection device of embodiment of the present invention; owing to have employed the described reducing flue of tapered configuration; and the pressure at the described smoke inlet place of described flue gas condensing heat exchanger is increased by described booster fan, overcome the impact that flue gas resistance increases, form more stable flue gas flow field.
In some embodiments, the first baffle door is provided with in described chimney, second baffle door is provided with in described reducing flue, the smoke outlet of described flue gas condensing heat exchanger is provided with third gear plate door, can quick pressure releasing when described first baffle door, described second baffle door and described third gear plate door and described booster fan are interlocked to ensure described booster fan fault.
In some embodiments, described combustion engine back-pressure protection device also comprises the DCS control system for controlling described first baffle door, described second baffle door, described third gear plate door and described booster fan.
In some embodiments, be provided with collecting annulus in described flue gas condensing heat exchanger, described collecting annulus is connected with multiple shower nozzle.
In some embodiments, described flue gas condensing heat exchanger is connected with the water pump for supplying water to described collecting annulus.
In some embodiments, described water pump is connected with water-feeding valve.
In some embodiments, described flue gas condensing heat exchanger is connected with drain valve.
In some embodiments, described combustion engine back-pressure protection device also comprises and is located at pressure transducer in described flue gas condensing heat exchanger and temperature transducer.
In some embodiments, bypass flue is provided with between described smoke outlet and described smoke inlet.
In some embodiments, described bypass flue is provided with fourth gear plate door.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of mode of execution, 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
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", " outward ", " clockwise ", orientation or the position relationship of the instruction such as " counterclockwise " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristics.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise one or more described features.In describing the invention, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly.Can be mechanical connection, also can be electrical connection.Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature it " on " or D score can comprise the first and second features and directly contact, also can comprise the first and second features and not be directly contact but by the other characterisation contact between them.And, fisrt feature second feature " on ", " top " and " above " comprise fisrt feature directly over second feature and oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " comprise fisrt feature directly over second feature and oblique upper, or only represent that fisrt feature level height is less than second feature.
Disclosing hereafter provides many different embodiments or example is used for realizing different structure of the present invention.Of the present invention open in order to simplify, hereinafter the parts of specific examples and setting are described.Certainly, they are only example, and object does not lie in restriction the present invention.In addition, the present invention can in different example repeat reference numerals and/or reference letter, this repetition is to simplify and clearly object, itself does not indicate the relation between discussed various embodiment and/or setting.In addition, the various specific technique that the invention provides and the example of material, but those of ordinary skill in the art can recognize the application of other techniques and/or the use of other materials.
Combustion engine back-pressure protection device 10 disclosed by the invention is applied to the fume afterheat degree of depth reclaiming system of larger gas cogeneration units, to guarantee that combustion engine back pressure all can maintain in safety range when fume afterheat degree of depth reclaiming system breaks down.
Refer to Fig. 1, combustion engine back-pressure protection device 10 comprises reducing flue 12, booster fan 14, bypass flue 36, first baffle door 22, second baffle door 24, third gear plate door 26, temperature transducer, pressure transducer, DCS control system.
The smoke inlet 160 of the columned chimney 20 of reducing flue 12 vertical connecting and flue gas condensing heat exchanger 16.Chimney 20 connects exhaust heat boiler 18 to receive the low-temperature flue gas of exhaust heat boiler 18 afterbody.Low-temperature flue gas enters reducing flue 12 through chimney 20, then flows in flue gas condensing heat exchanger 16 and carry out condensing heat-exchange, is finally back in chimney 20 again and discharges.Reducing flue 12 lateral arrangement, the cross section of reducing flue 12 between second baffle door 24 and booster fan 14 is tapered configuration, to increase flue gas pressures thus to overcome flue gas resistance.
Booster fan 14 is located in reducing flue 12, near the smoke inlet 160 of flue gas condensing heat exchanger 16.Booster fan 14 is slow-speed of revolution blower fan and adjusting rotor blade, is realizing under the variable prerequisite of exhaust gas volumn.Improve the stability of equipment.Booster fan 14 is the key equipments ensureing flue gas condensing heat exchanger 16 stability.For avoiding booster fan 14 because of dead electricity stoppage in transit, the first baffle door 22 to be opened to ensure that combustion engine back pressure is no more than the limit value of setting on the one hand, on the other hand, when booster fan 14 fault is stopped transport, should by the movable vane angular adjustment of booster fan 14 to maximum angle, to reduce flow passage resistance as much as possible, reduce the impact on combustion engine back pressure.
Bypass cigarette road 36 connects smoke inlet 160 and the smoke outlet 162 of flue gas condensing heat exchanger 16, and bypass cigarette road 36 is in vertically cylindric.
First baffle door 22 is located in chimney 20, second baffle door 24 to be located in reducing flue 12 and to be located between chimney 20 and booster fan 14, third gear plate door 26 is located at smoke outlet 162 place of flue gas condensing heat exchanger 16, fourth gear plate door 28 is located in bypass cigarette road 36, and the first baffle door 22, second baffle door 24, third gear plate door 26 and fourth gear plate door 28 and booster fan 14 are interlocked.First baffle door 22, second baffle door 24, third gear plate door 26 and fourth gear plate door 28 are set to 10s and open baffle door 22 soon.First baffle door 22, second baffle door 24, third gear plate door 26 and fourth gear plate door 28 are baffle door system.
Second baffle door 24 and third gear plate door 26 are in opening state when flue gas condensing heat exchanger 16 normally runs, booster fan 14 normal operation, and the first baffle door 22 and fourth gear plate door 28 are in closed condition, have at least a water pump 30 to run.The running state of water pump 30, first baffle door 22, second baffle door 24, third gear plate door 26, fourth gear plate door 28 on off state and booster fan 14 is presented at Dynamic System platform by DCS control system.Second baffle door 24 is interlocked in the start and stop of baffle door system sealing blower fan with the switch of third gear plate door 26, and when flue gas condensing heat exchanger 16 normally runs, baffle system seal fan stops.Under flue gas condensing heat exchanger 16 normal running (operation) conditions, the neat stress temperature at smoke outlet 162 place of flue gas condensing heat exchanger 16 normally runs setting limit value lower than demister.
Flue gas condensing heat exchanger 16 emergency shutdown type one:
(1) during normal operation, second baffle door 24 is closed;
(2) during normal operation, third gear plate door 26 is closed;
(3) demister entrance flue gas temperature >80 DEG C;
(4) all water pump 30 faults are stopped transport;
(5) liquid level of collecting annulus 164 reaches H3 value;
(6) collecting annulus 164 liquid level reaches L3 value;
Wherein, flue gas condensing heat exchanger 16 is provided with three high liquid level warning points, is respectively H1, H2 and H3.When flue gas condensing heat exchanger 16 liquid level reaches H1, send high liquid level warning signal.When flue gas condensing heat exchanger 16 liquid level reaches H2, while sending high liquid level warning signal, start blowdown valve blowdown 15min, to reduce liquid level.When flue gas condensing heat exchanger 16 liquid level reaches H3, send high liquid level warning signal, due to H3 > H2, now blowdown valve is opened, raise when reaching H3 further for avoiding liquid level, open drain valve 34, and perform the operation of opening the first baffle door 22 and stopping speedup blower fan 14.
Flue gas condensing heat exchanger 16 liquid level is provided with three low liquid level warning points, is L1, L2 and L3 respectively.When flue gas condensing heat exchanger 16 liquid level reaches L1, send low liquid level warning signal.When flue gas condensing heat exchanger 16 liquid level reaches L2, start water-feeding valve 32 moisturizing 15min while sending low liquid level warning signal, to improve liquid level.When liquid level reaches L3, send low liquid level warning signal, due to L3 < L2, now water-feeding valve 32 is opened, for avoiding the further reduction of liquid level to the harm of water pump 30, needs to carry out flue gas system and water pump 30 shutdown operation.
When flue gas condensing heat exchanger 16 meets above-mentioned arbitrary condition, emergency shutdown protection order is as follows:
(1) first baffle door 22 is opened;
(2) time delay 5S closes booster fan 14;
(3) for non-second baffle door 24 closing fault, second baffle door 24 is closed;
(4) for non-third gear plate door 26 closing fault, third gear plate door 26 is closed;
(5) baffle door system sealing blower fan is started
The condition types two that system emergency is stopped transport:
(1) flue gas condensing heat exchanger 16 dead electricity;
(2) booster fan 14 fault is stopped transport;
For the condition types two that system emergency is stopped transport, meet above-mentioned arbitrary condition, emergency shutdown order is:
(1) first baffle door 22 is opened;
(2) only retain a water pump 30 to run;
Emergency shutdown condition types two will cause booster fan 14 to be stopped transport, and now need to send booster fan 14 to DSC control system and stop transport signal to start the first baffle door 22, ensure that combustion engine back pressure is no more than the limit value of setting.After opening the first baffle door 22, when can ensure Host Security, carry out inspection and the reparation of flue gas condensing heat exchanger 16 system according to flue gas condensing heat exchanger 16 maintenance and operation program.
Petrol station and the actuator of booster fan 14 all adopt double-power source, when there is mains power failure by cutting standby power supply soon, ensure the power supply safety of petrol station and actuator, thus movable vane standard-sized sheet when being the stoppage in transit of booster fan 14 dead electricity creates conditions.
The condition types three that system emergency is stopped transport:
Flue gas pressures >=the 500Pa of the smoke inlet 160 of flue gas condensing heat exchanger 16, time delay 10s.
For meet system emergency stop transport condition types three time, emergency shutdown order be:
First baffle door 22 is opened.
For above-mentioned three class emergency shutdowns, all relate to the first baffle door 22.Consider that the first baffle door 22 is controlled by DCS control system, therefore all need when there is above-mentioned arbitrary emergency shutdown condition DCS control system transmission trouble signal to realize automatically opening the first baffle door 22 and operate, avoid running main frame having an impact.
According to the combustion engine back-pressure protection device 10 of embodiment of the present invention, comprise reducing flue 12 and booster fan 14.The smoke inlet 160 that reducing flue 12 connects flue gas condensing heat exchanger 16 and the chimney 20 be connected with exhaust heat boiler 18.Booster fan 14 is located in reducing flue 12, and the diameter of reducing flue 12 changes from chimney 20 to booster fan 14 direction convergent.
In the combustion engine back-pressure protection device 10 of embodiment of the present invention; owing to have employed the reducing flue 12 of tapered configuration; and the pressure at smoke inlet 160 place of flue gas condensing heat exchanger 16 is increased by booster fan 14, overcome the impact that flue gas resistance increases, form more stable flue gas flow field.
In the present embodiment, the first baffle door 22 is provided with in chimney 20, second baffle door 24 is provided with in reducing flue 12, the smoke outlet 162 of flue gas condensing heat exchanger 16 is provided with can quick pressure releasing when third gear plate door 26, first baffle door 22, second baffle door 24 and third gear plate door 26 interlocks to ensure booster fan 14 fault with booster fan 14.
So, by the action of booster fan 14 action and the first baffle door 22, second baffle door 24 and third gear plate door 26 is arranged chain reaction, ensure under booster fan 14 failure condition, quick pressure releasing, maintain combustion engine back pressure at normal level.
In the present embodiment, combustion engine back-pressure protection device 10 also comprises the DCS control system for controlling the first baffle door 22, second baffle door 24, third gear plate door 26 and booster fan 14.
So, the first baffle door 22, second baffle door 24, third gear plate door 26 and booster fan 14 action is controlled to maintain combustion engine back pressure at normal level by DCS control system.
In the present embodiment, be provided with collecting annulus 164 in flue gas condensing heat exchanger 16, collecting annulus 164 is connected with multiple shower nozzle 166.
So, cold water is sprayed to realize flue gas condensing heat exchange downwards by collecting annulus 164 and nozzle 166.
In the present embodiment, flue gas condensing heat exchanger 16 is connected with the water pump 30 for supplying water to collecting annulus 164.
So, supplied water to collecting annulus 164 by water pump 30.
In the present embodiment, water pump 30 is connected with water-feeding valve 32.
So, water-feeding valve 32 is opened to moisturizing in flue gas condensing heat exchanger 16 when the too low lack of water of flue gas condensing heat exchanger 16 liquid level.
In the present embodiment, flue gas condensing heat exchanger 16 is connected with drain valve 34.
So, drain valve 34 draining is opened when flue gas condensing heat exchanger 16 liquid level is too high to avoid flue gas condensing heat exchanger 16 liquid level too high.
In the present embodiment, combustion engine back-pressure protection device 10 also comprises and is located at pressure transducer in flue gas condensing heat exchanger 16 (figure does not mark) and temperature transducer (figure does not mark).
So, pressure in flue gas condensing heat exchanger 16 and temperature is detected so that control combustion engine back-pressure protection device 10 by pressure transducer and temperature transducer.
In the present embodiment, bypass flue 36 is provided with between smoke outlet 162 and smoke inlet 160.
So, when booster fan 14 fault, increase pressure release cross section by bypass flue 36, ensure that combustion engine back pressure is unaffected to the full extent.
In the present embodiment, bypass flue 36 is provided with fourth gear plate door 28.
So, control the logical of bypass flue 36 by fourth gear plate door 28 to close.
In the description of this specification, specific features, structure, material or feature that the description of reference term " mode of execution ", " some mode of executions ", " exemplary embodiment ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with mode of execution or example are contained at least one mode of execution of the present invention or example.In this manual, identical mode of execution or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more mode of execution or example.
Although illustrate and describe embodiments of the present invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these mode of executions when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (10)
1. a combustion engine back-pressure protection device, is characterized in that, comprising:
Reducing flue, the smoke inlet that described reducing flue connects flue gas condensing heat exchanger and the chimney be connected with exhaust heat boiler; And
Be located at the booster fan in described reducing flue, the diameter of described reducing flue changes from described chimney to described booster fan direction convergent.
2. combustion engine back-pressure protection device according to claim 1; it is characterized in that; the first baffle door is provided with in described chimney; second baffle door is provided with in described reducing flue; the smoke outlet of described flue gas condensing heat exchanger is provided with third gear plate door, can quick pressure releasing when described first baffle door, described second baffle door and described third gear plate door and described booster fan are interlocked to ensure described booster fan fault.
3. combustion engine back-pressure protection device according to claim 2, is characterized in that, described combustion engine back-pressure protection device also comprises the DCS control system for controlling described first baffle door, described second baffle door, described third gear plate door and described booster fan.
4. combustion engine back-pressure protection device according to claim 2, is characterized in that, be provided with collecting annulus in described flue gas condensing heat exchanger, described collecting annulus is connected with multiple shower nozzle.
5. combustion engine back-pressure protection device according to claim 4, is characterized in that, described flue gas condensing heat exchanger is connected with the water pump for supplying water to described collecting annulus.
6. combustion engine back-pressure protection device according to claim 5, it is characterized in that, described water pump is connected with water-feeding valve.
7. combustion engine back-pressure protection device according to claim 6, is characterized in that, described flue gas condensing heat exchanger is connected with drain valve.
8. combustion engine back-pressure protection device according to claim 7, is characterized in that, described combustion engine back-pressure protection device also comprises is located at pressure transducer in described flue gas condensing heat exchanger and temperature transducer.
9. combustion engine back-pressure protection device according to claim 2, is characterized in that, be provided with bypass flue between described smoke outlet and described smoke inlet.
10. combustion engine back-pressure protection device according to claim 9, is characterized in that, described bypass flue is provided with fourth gear plate door.
Priority Applications (1)
| 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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| 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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| Publication Number | Publication Date |
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| CN105020026A true CN105020026A (en) | 2015-11-04 |
| CN105020026B CN105020026B (en) | 2017-12-22 |
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| CN201510353244.2A Active CN105020026B (en) | 2015-06-24 | 2015-06-24 | Combustion engine back-pressure protection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107524527A (en) * | 2017-07-28 | 2017-12-29 | 华北电力大学 | A kind of gas turbine available for circulating power station becomes back pressure modernization system |
| 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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| CN103885433A (en) * | 2014-04-03 | 2014-06-25 | 北京京桥热电有限责任公司 | Power plant production 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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| CN102805999A (en) * | 2012-08-23 | 2012-12-05 | 北京威肯众合环保科技有限公司 | Turbulent ball type turbocharging compound desulfurization dust removal tower |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107524527A (en) * | 2017-07-28 | 2017-12-29 | 华北电力大学 | A kind of gas turbine available for circulating power station becomes back pressure modernization system |
| 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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| CN105020026B (en) | 2017-12-22 |
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