CN209724500U

CN209724500U - Low-pressure fuel gas generating set air inlet and exhaust piper gas leak detection device

Info

Publication number: CN209724500U
Application number: CN201920232548.7U
Authority: CN
Inventors: 唐行辉
Original assignee: Weichai Xigang New Energy Power Co Ltd
Current assignee: Weichai Xigang New Energy Power Co Ltd
Priority date: 2019-02-25
Filing date: 2019-02-25
Publication date: 2019-12-03
Anticipated expiration: 2029-02-25

Abstract

The utility model discloses a kind of low-pressure fuel gas generating set into, exhaust pipe gas leak detection device, including mixer, air signal detection device and electronic fuel valve, mixer is in series with turbocharger, intercooler, electronic throttle and inlet manifold, boost-pressure sensor is installed on rear side of intercooler, air inlet pressure sensor is installed on inlet manifold, it further include exhaust main, turbocharger and lambda sensor, air signal detection device, electronic fuel valve, boost-pressure sensor, air inlet pressure sensor and lambda sensor are respectively connected to electronic control unit ECU, electronic control unit ECU is connected with warning device, closed loop coefficient CL of the electronic control unit ECU to unit, the carry out real-time monitoring of boost pressure PTP and admission pressure MAP, the leakage of pipeline is judged respectively, and it analyzes The general location of leak source and the size of leak source, sound an alarm in time, can forced stoppage under serious leak, it is ensured that the safety of unit and the person.

Description

Low-pressure fuel gas generating set air inlet and exhaust piper gas leak detection device

Technical field

The utility model relates to low-pressure fuel gas generating set operation detection device more particularly to a kind of low-pressure fuel gas generators Group air inlet and exhaust piper gas leak detection device.

Background technique

Currently, low pressure natural gas, device in Gas, biogas etc. is used gradually to be answered extensively as the jet dynamic control of gas source With increasing income for national energy conservation and emission reduction, environmental pollution improvement and people's extra earning and bring benefit true, while Gas Generator Set The tail gas product of discharge be carbon dioxide and water, cleanliness without any pollution, thus obtain country vigorously support.Due to by air source pressurizing The restriction of cost and safety, overwhelming majority land is all made of low-pressure gas source with jet dynamic control at present.

The bleed pressure that low-pressure fuel gas generating set generally uses is not higher than 30kPa, combustion gas and the air shape in mixer At gaseous mixture, by charger boost, intercooler it is cooling and pass through air throttle throttling after, flow into cylinder and light acting, discharge Exhaust-driven supercharger turbine rotation after be discharged into atmosphere.In the pressure shell cavity of low-pressure fuel gas generating set booster, It is combustion gas and the gaseous mixture that air is formed in inter cooling pipeline, inlet manifold and inlet manifold, once above-mentioned pipeline generates leakage, Gaseous mixture can be leaked to directly outside body, due to containing a certain proportion of natural gas, the leakage of gaseous mixture in mixed gas There are great security risks, not only polluted environment, but also are possible to cause fire and explosion, and in addition gas exhaust piping has leakage It is the boosting capability deficiency that also will cause booster, carries jet dynamic control band difficult.

It is directed to above-mentioned phenomenon currently on the market, only fraction gas electricity generator is assembled with gas leakage alarming device, however This device sensitivity is low, it is general only to larger leakage rate in the case where play alarm function, leak source lesser for leakage rate, this dress It sets and often detects less than sensitivity is tight when in addition above-mentioned warning device uses in the place that wind-force is larger, air flow property is good It reduces again, or even can not normally detect alarm, therefore can not accurately detect the leakage phenomenon of jet dynamic control pipeline.

Utility model content

The technical problem to be solved by the utility model is to provide a kind of gas leakage when can voluntarily judge alarm and Corresponding protection act is carried out, and analyzes the general location of leakage area and leakage, facilitates the maintenance of maintenance personal, simultaneously The leakage of gas exhaust piping is also analyzed, prevents the leakage of exhaust gas from causing charger boost insufficient, avoiding, which influences unit band, carries The low-pressure fuel gas generating set air inlet and exhaust piper gas leak detection device of performance.

In order to solve the above technical problems, the technical solution of the utility model is: the leakage of low-pressure fuel gas generating set air inlet and exhaust piper Gas detection device, including mixer, the air of the mixer are sent into end and are equipped with air signal detection device, the mixer Combustion gas be sent into end electronic fuel valve be installed, the outlet side of the mixer, which is in series with, to be increased the turbine of mixture pressure and increases Depressor, the mixed gas of the turbocharger send out end and have been sequentially connected in series intercooler, electronic throttle and air inlet by pipeline General pipeline, the inlet manifold are correspondingly connected to each cylinder, the intercooler and institute by the inlet manifold being arranged in parallel It states and boost-pressure sensor is installed on the pipeline between electronic throttle, between the electronic throttle and the inlet manifold The inlet manifold on air inlet pressure sensor is installed, the cylinder passes through exhaust manifold respectively and is connected to exhaust General pipeline, the exhaust main are connected to an inlet end of the turbocharger, the exhaust emissions end peace of the turbocharger Equipped with lambda sensor, the air signal detection device, the electronic fuel valve, the boost-pressure sensor, the air inlet Pressure sensor and the lambda sensor are respectively connected to electronic control unit ECU, and the electronic control unit ECU is connected with report Alarm device.

The air signal detection device includes the temperature for detecting air temperature signal as a preferred technical solution, Sensor and pressure sensor for detecting air pressure.

The temperature sensor and the pressure sensor are integrated form integral structure as a preferred technical solution,.

The warning device includes the report being connected electrically on the electronic control unit ECU as a preferred technical solution, Warning lamp.

By adopting the above-described technical solution, the beneficial effects of the utility model are: electronic control unit ECU is to unit The carry out real-time monitoring of closed loop coefficient CL, boost pressure PTP and admission pressure MAP, are judged, electronic control unit ECU can Judged respectively with the leakage of inter cooling pipeline, inlet manifold and inlet manifold, exhaust main to intercooler, and analyzes leakage The general location of point and the size of leak source, sound an alarm in time, can also limit electronic throttle according to the size of leakage rate Aperture carries out limit and turns round protection, can forced stoppage under serious leak, it is ensured that the safety of unit and the person makes alarm be no longer dependent on combustion The poor sensitivity and precision of gas leakage device.

Detailed description of the invention

Following drawings are only intended to schematically illustrate and explain the present invention, does not limit the model of the utility model It encloses.Wherein:

Fig. 1 is the structural schematic diagram of the utility model embodiment；

Fig. 2 is the work flow diagram of the utility model embodiment；

In figure: 1- mixer；2- air signal detection device；3- electronic fuel valve；4- turbocharger；5- intercooler； 6- electronic throttle；7- inlet manifold；8- inlet manifold；9- cylinder；10- boost-pressure sensor；11- admission pressure Sensor；12- exhaust manifold；13- exhaust main；14- lambda sensor；15- electronic control unit ECU；16- alarm lamp.

Specific embodiment

With reference to the accompanying drawings and examples, the utility model is further described.In the following detailed description, only pass through Bright mode describes certain exemplary embodiments of the utility model.Undoubtedly, those skilled in the art can be with It recognizes, it, can be with a variety of different modes to described without departing from the spirit and scope of the utility model Embodiment is modified.Therefore, attached drawing and description are regarded as illustrative in nature, rather than the protection for limiting claim Range.

As depicted in figs. 1 and 2, low-pressure fuel gas generating set air inlet and exhaust piper gas leak detection device, including mixer 1, it is described The air of mixer 1 is sent into end and is equipped with air signal detection device 2, and the air signal detection device 2 includes for detecting The temperature sensor of air temperature signal and pressure sensor for detecting air pressure, and the temperature sensor and described Pressure sensor is integrated form integral structure, convenient for arrangement installation, air for entering to the mixer 1 carry out temperature with Pressure detecting.The combustion gas of the mixer 1 is sent into end and is equipped with electronic fuel valve 3, for the natural of the entrance mixer 1 Gas carries out feeding control, natural gas and air and mixes in the mixer 1, forms the gas of the low-pressure fuel gas generating set Fuel.

The outlet side of the mixer 1 is in series with the turbocharger 4 for increasing mixture pressure, the turbocharger 4 mixed gas sends out end and has been sequentially connected in series intercooler 5, electronic throttle 6 and inlet manifold 7 by pipeline, and the air inlet is total Pipe 7 is correspondingly connected to each cylinder 9 by the inlet manifold 8 of parallel arrangement, and gaseous fuel is in the cylinder 9 Work by combustion generates kinetic energy, driving associated components movement.Pacify on pipeline between the intercooler 5 and the electronic throttle 6 Equipped with boost-pressure sensor 10, installed on the inlet manifold 7 between the electronic throttle 6 and the inlet manifold 8 There is air inlet pressure sensor 11, the boost-pressure sensor 10 is used to detect the gas pressure of 5 outlet side of intercooler, institute Air inlet pressure sensor 11 is stated for detecting the pressure of the inlet manifold 7, is used so that gas leakage detects.

The cylinder 9 is connected to exhaust main 13 by exhaust manifold 12 respectively, and the exhaust main 13 connects To an inlet end of the turbocharger 4, oxygen sensor 14 is installed at the exhaust emissions end of the turbocharger 4, described Air signal detection device 2, the electronic fuel valve 3, the boost-pressure sensor 10,11 and of the air inlet pressure sensor The lambda sensor 14 is respectively connected to electronic control unit ECU15, and the electronic control unit ECU15 passes through to each signal Acquisition and processing, ultimately form the foundation that air leakage point is detected and determined, and fed back by the electronic control unit ECU15, So that maintenance personal is with reference to use.

The electronic control unit ECU15 is connected with warning device, and the warning device includes being connected electrically in the electronics Alarm lamp 16 on control unit ECU15, when low-pressure fuel gas generating set inlet and outlet pipeline generates gas leak phenomenon, the electricity Sub-control unit ECU15 controls the alarm lamp 16 and lights, to remind staff mainly to repair.

The specific detection method of the present embodiment, includes the following steps,

Step 1: default processing

A) the low-pressure fuel gas generating set factory test No leakage and in the state of without load operation to working speed When, the admission pressure MAP value for the inlet manifold 7 that the air inlet pressure sensor 11 detects is m.

In actual moving process, when the low-pressure fuel gas generating set is run in the state of without load to working speed, The admission pressure MAP value for the inlet manifold 7 that the air inlet pressure sensor 11 detects is MAP_{Actual value}, and calculate actual motion The admission pressure difference δ of state and mark condition state_MAP, calculation formula are as follows:

δ_MAP=MAP_{Actual value}-m。

B) the low-pressure fuel gas generating set factory test No leakage, moreover under mark different load, record the air inlet The corresponding pressurization pressure that the admission pressure MAP value and the boost-pressure sensor 10 that pressure sensor 11 detects detect Power PTP value, and the pressure standard condition value table of comparisons is drawn, it is specific as shown in table 1,

Table 1

MAP(kPa)	30	50	100	200	220	250	300
								PTP(kPa)	100	105	150	250	280	300	330

Mark condition mentioned by the present embodiment is 1 standard atmospheric pressure, the air inlet state that temperature is 20 DEG C.

C) the electronic control unit ECU15 can according to the atmospheric temperature that the air signal detection device 2 detects, Pressure data is calculated, and atmospheric density is as follows with the relationship of air pressure and temperature,

ρ is atmospheric density；

P is the atmospheric pressure value detected；

T is the atmospheric temperature value detected.

D) it demarcates and records under different atmospheric density in advance, to the correction value of closed loop coefficient CL, and calculate the low pressure combustion The closed loop coefficient CL of the gas generating set in actual motion, and closed loop coefficient CL accuracy table is drawn, specifically such as 2 institute of table Show, calculation formula are as follows:

Closed loop coefficient

The closed loop coefficient CL is after 14 closed loop of lambda sensor to the regulation coefficient of the electronic fuel valve 3；

V_{Trim actual value}For the aperture of the electronic fuel valve 3 of the electronic control unit ECU15 real-time detection；

V_{Trim calculated value}For opening for electronic control unit ECU15 described in the case where the marking condition electronic fuel valve 3 being calculated Degree；

CL_{Correction value}For under different atmospheric density to the correction value of the closed loop coefficient CL.

The value of closed loop coefficient CL as described in the test method of this hair embodiment is important decision content, in order to exclude machine The different influences to the closed loop coefficient CL of group actual motion environment (such as height above sea level, atmospheric temperature) need to demarcate in advance not (height above sea level and air themperature are calculated into atmospheric density) to the correction value of closed loop coefficient CL under atmospheric density.By amendment, make The closed loop coefficient CL value for obtaining practical measurement is no longer influenced by atmospheric conditions, so that this detection method is more accurate.Simultaneously Different atmospheric density can also have an impact the boosting capability of booster, it is also desirable to simulating under different atmospheric density to pressurization The correction factor value of PTP after device, i.e. step e.

By amendment, closed loop coefficient CL >=1, then show electronic fuel valve need the angle opened than anticipation than Bigger, i.e., engine, which needs to spray into more combustion gas, can be only achieved preset mixture strength value.As long as there is leakage in air inlet pipeline Gas phenomenon, the then angle for requiring the unlatching of electronic fuel valve are greater than the calculated value in air tight situation to maintain the dense of gaseous mixture Degree, that is to say, that as long as there are gas leak phenomenon, the closed loop coefficient CL > 1 for air inlet pipeline.

E) it demarcates and records under different atmospheric density in advance, the correction factor S of boost pressure PTP value, and calculate described low The target value of boost pressure PTP of the jet dynamic control in actual motion is pressed, correction factor S table is drawn, for convenient for comparison, sheet Embodiment is merged correction factor S table with the accuracy table of the closed loop coefficient CL, specific as shown in table 2, is calculated public Formula are as follows:

Boost pressure PTP_{Target value}=boost pressure PTP_{Standard condition value}× correction factor S

Boost pressure PTP_{Standard condition value}For the boost pressure value for marking the mixed gas in each operating condition measured under condition；

Table 2

F) on-load before the low-pressure fuel gas generating set dispatches from the factory, the inter cooling pipeline of the outlet side of the intercooler 5 is beaten The hole of different cross-sectional areas is opened, to simulate the leakage situation of unit in actual work, obtains the closed loop under different leakage areas The value of coefficient CL, and record；Change the load of the low-pressure fuel gas generating set, and according to above-mentioned test method, obtains corresponding The closed loop coefficient CL value of different leakage areas under load, and record and draw the corresponding gas leakage of closed loop coefficient CL value under different load Area table, it is specific as shown in table 3,

Table 3

Exhaust main 13, is opened different cross-sectional areas by on-load before g) the low-pressure fuel gas generating set dispatches from the factory Hole obtains the boost pressure PTP value under different leakage areas, and record to simulate the leakage situation of unit in actual work；Change The load for becoming the low-pressure fuel gas generating set obtains the different leakage areas under corresponding load according to above-mentioned test method Boost pressure PTP value, records and calculates δ_PTP, draw δ under different load_PTPCorresponding gas leakage area table, it is specific as shown in table 4,

δ_PTP=PTP_{Target value}-PTP_{Actual value}

PTP_{Target value}For the target that under the low-pressure fuel gas generating set gas-tight state, the charger boost reaches Value；

PTP_{Actual value}For the pressurization that in the low-pressure fuel gas generating set actual moving process, the booster is actually reached Value.

Table 4

Due to the presence of the booster, boost pressure PTP value is made to be consistently greater than atmospheric pressure.If the intercooler 5 There is leakage in inter cooling pipeline, then boost pressure PTP measured value inherently reduces after the booster, δ_PTP> 0, and in order to maintain Mixture strength, the closed loop coefficient CL > 1；If gas exhaust piping is there are gas leakage, the ability of booster described in exhaust gas driven Weaken, boosting capability is insufficient, can also there is δ_PTP> 0, but do not influence the concentration of the mixer 1, i.e., the closed loop system is not influenced Number CL value.

Step 2: inlet manifold 7 and 8 gas leakage of inlet manifold judgement

Start the low-pressure fuel gas generating set, keeps its engine non-loaded and to working speed (general country's 50Hz machine Group revolving speed is to 1500 turns), the admission pressure MAP value of the electronic control unit ECU15 detection at this time, and calculate and the electronics The value of delta of the admission pressure MAP value m of control unit ECU15 internal preset_MAP, due to making in each the cylinder piston suction without load Under, admission pressure MAP value is negative pressure (30kPa~40kPa is generally in air tight situation) and numerical value is sufficiently stable.It counts simultaneously Calculate closed loop coefficient CL, closed loop coefficient CL value >=N, and δ_MAP>=M, the then inlet manifold after can conclude that the electronic throttle 6 7 and the inlet manifold 8 have a gas leak phenomenon, the electronic control unit ECU15 drives the warning device alert, User is reminded to check.Because air is pressed into admission pressure MAP in this section of pipeline under atmospheric pressure and increases, and becomes gaseous mixture Dilute, electronic fuel valve opening increases to maintain setting concentration, closed loop coefficient CL >=1.05.In the present embodiment, N is setting value, can Value is 1.05；M is setting value, can value be 5kPa.

Step 3: severe gas leakage judgement in inter cooling pipeline between the intercooler 5 and the electronic throttle 6

Start the low-pressure fuel gas generating set, keep its engine non-loaded and to working speed, the electronic control is single The admission pressure MAP value of first ECU15 detection at this time, and calculate the air inlet pressure with the electronic control unit ECU15 internal preset The value of delta of power MAP value m_MAP, while closed loop coefficient CL is calculated, closed loop coefficient CL value >=N, and δ_MAP< M, then inter cooling pipeline exists Gas leakage is possible, needs to further determine that.

Normally band carries the low-pressure fuel gas generating set, and the booster is started to work, and boost pressure PTP value increases, institute It states electronic control unit ECU15 and calculates δ again_PTPValue, δ_PTP>=M is reduced, then when pressure is air tight before relatively dispatching from the factory after being then pressurized It can conclude that there is gas leak phenomenon in the middle cooling pipe section, and gas leakage area is generally large at this time, the electronic control unit ECU passes through The warning device alert, and from the corresponding gas leakage area table of closed loop coefficient CL value under the different load of drafting It is looked into (i.e. table 3) and takes gas leakage area value, gas leakage area is in 0.5mm²~1mm²When, the adjustable electronic throttle 6 is opened Degree, to limit unit torque, gas leakage area is greater than 1mm²When need emergency shutdown, prevent unit meet with an accident safety accident.

Step 4: the slight gas leakage of inter cooling pipeline between the intercooler 5 and the electronic throttle 6 judges described in starting Low-pressure fuel gas generating set keeps its engine non-loaded and to working speed, closed loop coefficient CL value and δ_MAPValue is normal, by it Engine switching detects closed loop coefficient CL >=N, and δ in operational process to run with load state_PTP>=M, then inter cooling pipeline has Slight gas leak phenomenon, generally after load pressurization, caused by line connection clip clamp force is insufficient, the electronic control unit at this time ECU15 controls the warning device and sends a warning, and looks under different load the corresponding gas leakage area table of closed loop coefficient CL value (i.e. Table 3) after, determine gas leakage area in 0.5mm²~1mm²The aperture of the electronic throttle 6 can be limited, and then limits unit and turns round Square.

Step 5: exhaust main 13 and 12 gas leakage of exhaust manifold judgement

The engine start of the low-pressure fuel gas generating set and raising speed are to working speed, closed loop coefficient CL value and δ_MAPValue Normal, switching to band carries state, and closed loop coefficient CL value is normal, and the electronic control unit ECU15 detects δ_PTP>=M, then say Bright pressurization is abnormal, and there are gas leak phenomenons for exhaust main 13 and exhaust manifold 12, and the electronic control unit ECU15 controls institute at this time It states warning device to send a warning, and δ under status inquiry different load is carried according to band_PTPCorresponding gas leakage area table (i.e. table 4) gas leakage area, is determined.

Step 6: gas concentration is thinning, the air tight judgement of pipeline

Start the engine of the low-pressure fuel gas generating set to working speed, without load condition, the electronic control Unit ECU15 detects closed loop coefficient CL >=N and δ_MAPUnit switching to normal band is carried state by < M, and the booster starts Work, boost pressure PTP value increase, and the electronic control unit ECU15 calculates δ again_PTPValue, δ_PTP< M, then show middle cooling pipe Road is simultaneously air tight, but the gas concentration of supply engine is thinning, then the electronic control unit ECU15 is by attempting wrong amendment The combustion gas density value of internal preset finely tunes the opening value of the electronic fuel valve 3, so that closed loop coefficient CL is less than N again.

Step 7: the air tight judgement of inlet and outlet pipeline

Start the engine start raising speed of the low-pressure fuel gas generating set to working speed, without load condition, closed loop Coefficient CL value and δ_MAPIt is normal, unit switching to normal band is carried into state, closed loop coefficient CL value is also normal, the electronic control Unit ECU15 detects δ_PTP< M then shows that inlet and outlet pipeline is air tight, and gas concentration is normal.

The embodiment of the present invention electronic control unit ECU15 passes through to closed loop coefficient CL, δ_MAP、δ_PTPThree are worth mutually ratio Compared with conveniently accurately capable of obtaining unit Gas leak position, and alert notice client checks in time, greatly reduces machine The risk of group operation.Specifically, closed loop coefficient CL, boost pressure PTP and admission pressure of the electronic control unit ECU15 to unit The carry out real-time monitoring of MAP, is judged, electronic control unit ECU15 can inter cooling pipeline to intercooler 5, inlet manifold 7 Leakage with inlet manifold 8, exhaust main 13 judged respectively, and analyze leak source general location and leak source it is big It is small, it sounds an alarm in time, can also carry out limit according to the aperture that the size of leakage rate limits electronic throttle 6 and turn round protection, seriously let out Leaking down can forced stoppage, it is ensured that the safety of unit and the person makes alarm be no longer dependent on the poor sensitive of gas leakage device Degree and precision.

The advantages of basic principles and main features and the utility model of the utility model have been shown and described above.Current row The technical staff of industry is described in above embodiments and description it should be appreciated that the present utility model is not limited to the above embodiments Only illustrate the principles of the present invention, on the premise of not departing from the spirit and scope of the utility model, the utility model is also It will have various changes and improvements, these various changes and improvements fall within the scope of the claimed invention.The utility model Claimed range is defined by the appending claims and its equivalent thereof.

Claims

1. low-pressure fuel gas generating set air inlet and exhaust piper gas leak detection device, it is characterised in that: including mixer, the mixer Air be sent into end air signal detection device be installed, the combustion gas of the mixer is sent into end and is equipped with electronic fuel valve, institute The outlet side for stating mixer is in series with the turbocharger for increasing mixture pressure, and the mixed gas of the turbocharger is sent Outlet has been sequentially connected in series intercooler, electronic throttle and inlet manifold by pipeline, and the inlet manifold passes through parallel arrangement Inlet manifold is correspondingly connected to each cylinder, and increasing is equipped on the pipeline between the intercooler and the electronic throttle Pressure pressure sensor is equipped with admission pressure biography on the inlet manifold between the electronic throttle and the inlet manifold Sensor, the cylinder pass through exhaust manifold respectively and are connected to exhaust main, and the exhaust main is connected to the turbine Oxygen sensor, the air signal detection dress are installed in one inlet end of booster, the exhaust emissions end of the turbocharger It sets, the electronic fuel valve, the boost-pressure sensor, the air inlet pressure sensor and the lambda sensor are separately connected To electronic control unit ECU, the electronic control unit ECU is connected with warning device.

2. low-pressure fuel gas generating set air inlet and exhaust piper gas leak detection device as described in claim 1, it is characterised in that: described Air signal detection device includes the temperature sensor for detecting air temperature signal and the pressure for detecting air pressure Sensor.

3. low-pressure fuel gas generating set air inlet and exhaust piper gas leak detection device as claimed in claim 2, it is characterised in that: described Temperature sensor and the pressure sensor are integrated form integral structure.

4. low-pressure fuel gas generating set air inlet and exhaust piper gas leak detection device as claimed in claim 1,2 or 3, it is characterised in that: The warning device includes the alarm lamp being connected electrically on the electronic control unit ECU.