CN111997791A

CN111997791A - Engine combustion regulation and control structure and method based on cold flame reforming

Info

Publication number: CN111997791A
Application number: CN202010900747.8A
Authority: CN
Inventors: 潘家营; 万思萌; 卫海桥; 王磊; 舒歌群; 梁兴雨; 唐若月
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2020-11-27

Abstract

The present disclosure provides an engine combustion regulation structure and method based on cold flame reforming, wherein the engine combustion regulation structure based on cold flame reforming comprises: a monitoring unit, a first reformate input unit, and a second reformate input unit; a first storage tank in the first reformate input unit is connected with an engine air inlet channel through a first conduit, and a first electromagnetic valve controls the conduction or the closing of the first conduit; the second storage tank in the second reforming product input unit is connected with the engine air inlet channel through a second conduit, and a second electromagnetic valve controls the conduction or the closing of the second conduit. According to the method, in the working process of the engine, the reformate with the appropriate reforming degree is input according to different working conditions, so that the working state of the engine is controlled in real time, the combustion efficiency of the engine is effectively improved, and the combustion of the engine is accurately and flexibly controlled.

Description

Engine combustion regulation and control structure and method based on cold flame reforming

Technical Field

The disclosure relates to the field of heat energy and power engineering, in particular to an engine combustion regulation and control structure and method based on cold flame reforming.

Background

In recent years, it has been considered that a novel compression ignition engine using a (partially) premixed combustion system can achieve thermal efficiency as high as that of a gasoline engine and can also achieve soot and NO_xThe emissions are simultaneously reduced to almost zero, and thus have received wide attention. However, this ideal combustion method is difficult to control for stable combustion in a real gasoline engine. When the combustion temperature and the compression end pressure are too low, the gasoline mixed gas is difficult to spontaneously ignite, so that the phenomena of fire catching, extremely unstable fire catching time and the like occur; when the combustion temperature and the compression pressure end pressure are too high, the ignition timing is too advanced and the combustion rate is too fast, so that rough combustion and the like occur. Therefore, if the novel compression ignition engine is expected to achieve the ideal effect, the combustion of the novel compression ignition engine should be controlled to be stable.

Disclosure of Invention

Technical problem to be solved

The present disclosure provides an engine combustion regulation structure and method based on cold flame reforming to solve the above-mentioned technical problems.

(II) technical scheme

According to an aspect of the present disclosure, there is provided an engine combustion regulation structure based on cold flame reforming, including:

the monitoring unit is arranged in the engine cylinder; the monitoring unit is used for acquiring the running condition of the engine cylinder according to the relation between the real-time monitoring temperature of the engine cooling water and the preset temperature;

a first reformate input unit comprising:

a first storage tank for storing a first reformate; the first storage tank is connected with an engine air inlet channel through a first conduit;

the first electromagnetic valve is arranged on the first conduit; the first electromagnetic valve is used for controlling the conduction or the closing of the first conduit according to the running condition of the engine cylinder output by the monitoring unit;

a second reformate input unit comprising:

a second storage tank for storing a second reformate; the second storage tank is connected with the engine air inlet channel through a second conduit;

and the second electromagnetic valve is arranged on the second conduit and used for controlling the conduction or the closing of the second conduit according to the running condition of the engine cylinder output by the monitoring unit.

In some embodiments of the present disclosure, the detection unit includes:

the sensor is used for acquiring the real-time monitoring temperature of the engine cooling water;

and the monitoring module is used for judging the relation between the real-time monitoring temperature of the engine cooling water and the preset temperature and acquiring the running state of the engine cylinder.

In some embodiments of the present disclosure, the first solenoid is turned on when the monitored temperature is less than the preset temperature.

In some embodiments of the present disclosure, the second solenoid valve is opened when the monitored temperature is greater than the preset temperature.

In some embodiments of the present disclosure, the preset temperature range is 85 to 95 degrees celsius.

In some embodiments of the disclosure, the first reformate is a light reformate, and the light reformate is a mixture of peroxide and carbonyl peroxide in a ratio of 0.15% to 0.4% at a concentration of 1500ppm to 4000 ppm.

In some embodiments of the present disclosure, the second reformate is a heavy reformate, and the heavy reformate is a mixed gas having a ratio of olefins to aldehydes of 1% to 5% at a concentration of 10000ppm to 50000 ppm.

According to an aspect of the present disclosure, there is also provided an engine combustion regulation method based on cold flame reforming, including:

acquiring the real-time monitoring temperature of the cooling water of the engine;

judging the relation between the real-time monitoring temperature of the engine cooling water and the preset temperature, and acquiring the running condition of an engine cylinder;

when the monitored temperature is lower than the lower limit value of the preset temperature, the first electromagnetic valve is opened, and the first reforming product enters an engine air inlet channel through the first conduit.

In some embodiments of the present disclosure, the determining a relationship between a real-time monitored temperature of engine cooling water and a preset temperature further includes, after obtaining an operating condition of an engine cylinder:

when the monitoring temperature is higher than the upper limit value of the preset temperature, the second electromagnetic valve is opened, and the second reformate enters an engine air inlet channel through the second conduit.

In some embodiments of the present disclosure, the obtaining of the real-time monitored temperature of the engine cooling water further comprises:

before the ignition of the engine cylinder, the first electromagnetic valve is opened, and the first reformate is introduced into an engine air inlet channel.

(III) advantageous effects

According to the technical scheme, the engine combustion regulation and control structure and method based on cold flame reforming have at least one or part of the following beneficial effects:

(1) according to the method, in the working process of the engine, the reformate with the appropriate reforming degree is input according to different working conditions, so that the working state of the engine is controlled in real time, the combustion efficiency of the engine is effectively improved, and the combustion of the engine is accurately and flexibly controlled.

(2) The light reformate is introduced before the ignition of the engine, so that the ignition is convenient, and the utilization rate of fuel is improved.

Drawings

FIG. 1 is a schematic diagram of an engine combustion regulation architecture based on cold flame reforming according to an embodiment of the present disclosure.

FIG. 2 is a flow chart of an engine combustion regulation method based on cold flame reforming according to an embodiment of the disclosure.

FIG. 3 is a flow chart of an engine combustion regulation method based on cold flame reforming according to an embodiment of the disclosure.

[ description of main reference numerals in the drawings ] of the embodiments of the present disclosure

1-a first conduit;

2-a first solenoid valve;

3-a nozzle;

4-an engine intake passage;

5-a second electromagnetic valve;

6-a second conduit;

7-a second storage tank;

8-a first storage tank;

9-engine cylinder.

Detailed Description

Research shows that the specific hydrocarbon fuel has low-temperature cold flame characteristics, and after different thermodynamic conditions are applied to the specific hydrocarbon fuel, the generated light reformate mainly comprises peroxide and carbonyl peroxide, has high reaction activity and long quenching distance, and is beneficial to improving the ignition stability of small loads in an engine; the heavy reformate mainly comprises olefin and aldehyde, has low reaction activity and is beneficial to inhibiting the problem of heavy load detonation of an engine. Therefore, cold flame reforming of certain hydrocarbon fuels may improve the stability of new types of compression ignition combustion.

For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.

Certain embodiments of the present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the disclosure are shown. Indeed, various embodiments of the disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements.

In a first exemplary embodiment of the present disclosure, an engine combustion regulation architecture based on cold flame reforming is provided. FIG. 1 is a schematic diagram of an engine combustion regulation architecture based on cold flame reforming according to an embodiment of the present disclosure. As shown in fig. 1, an engine combustion regulation structure based on cold flame reforming includes: a monitoring unit, a first reformate input unit, and a second reformate input unit. According to the method, in the working process of the engine, the reformate with the appropriate reforming degree is input according to different working conditions, so that the working state of the engine is controlled in real time, the combustion efficiency of the engine is effectively improved, and the combustion of the engine is accurately and flexibly controlled.

The respective components of the klystron of the present embodiment are described in detail below.

The monitoring unit is arranged in a cylinder cover of the engine cylinder 9 and is used for acquiring the running condition of the engine cylinder 9 according to the relation between the real-time monitoring temperature and the preset temperature of the cooling water in the cylinder cover of the engine cylinder 9. The monitoring unit includes: a sensor and a monitoring module. The sensor is used for acquiring the real-time monitoring temperature of the engine cooling water. The monitoring module is used for judging the relation between the real-time monitoring temperature of the engine cooling water temperature and the preset temperature and acquiring the running state of the engine cylinder 9.

The first reformate input unit includes: a first tank and a first solenoid valve 2. The first storage tank 8 is used for storing a first reformate, two ends of the first conduit 1 are respectively connected with the first storage tank 8 and the engine intake passage 4, and the end of the first conduit 1 connected with the engine intake passage 4 is provided with a nozzle 3. The first electromagnetic valve 2 is arranged on the first conduit 1; the first electromagnetic valve 2 is used for controlling the conduction or the closing of the first conduit 1 according to the running condition of the engine cylinder 9 output by the monitoring unit.

The second reformate input unit comprises: a second storage tank and a second solenoid valve 5. The second storage tank 7 is used for storing a second reforming product, two ends of the second conduit 6 are respectively connected with the second storage tank 7 and the engine air inlet channel 4, and the end part of the second conduit 6 connected with the engine air inlet channel 4 is provided with the nozzle 3. The second electromagnetic valve 5 is arranged on the second conduit 6; the second electromagnetic valve 5 is used for controlling the conduction or the closing of the second conduit 6 according to the running condition of the engine cylinder 9 output by the monitoring unit.

The preset temperature is generally a range of values, and specifically, the preset temperature is 85 to 95 ℃.

Further, when the monitored temperature is less than the lower limit value of the preset temperature, the first electromagnetic valve 2 is opened. The first reformate is a light reformate. Specifically, the mild reforming product is a mixed gas with the proportion of peroxide and carbonyl peroxide of 0.15-0.4 percent, and the concentration is 1500-4000 ppm.

Further, when the monitored temperature is higher than the upper limit value of the preset temperature, the second electromagnetic valve is opened. The second reformate is a severe reformate. Specifically, the heavy reformate is a mixed gas with the ratio of olefin to aldehyde of 1-5 percent, and the concentration is 10000-50000 ppm.

In a second exemplary embodiment of the present disclosure, a method of engine combustion regulation based on cold flame reforming is provided. FIG. 2 is a flow chart of an engine combustion regulation method based on cold flame reforming according to an embodiment of the disclosure. As shown in fig. 2, the engine combustion regulation method based on cold flame reforming includes:

and S0, before the ignition of the engine cylinder, the first electromagnetic valve is opened, and the first reformate (light reformate) is led into the engine air inlet channel so as to facilitate the ignition and improve the fuel utilization rate.

And S1, acquiring the real-time monitoring temperature of the engine cooling water.

And S2, judging the relation between the real-time monitoring temperature of the engine cooling water and the preset temperature, and acquiring the operation condition of the engine cylinder.

And S3, when the monitored temperature is lower than the preset temperature. Specifically, when the preset temperature is within a temperature range of 85 to 95 ℃, the monitored temperature is less than the lower limit value of the preset temperature. The first solenoid valve is opened and the first reformate (light reformate) enters the engine intake passage through the first conduit, and the engine is currently in a low load operating band. The engine is considered to be in the low load operation section when the monitored engine cooling water temperature with respect to the low load operation is lower than 85 degrees celsius.

In a second exemplary embodiment of the present disclosure, a method of engine combustion regulation based on cold flame reforming is provided. FIG. 3 is a flow chart of an engine combustion regulation method based on cold flame reforming according to an embodiment of the disclosure. As shown in fig. 3, the engine combustion regulation method based on cold flame reforming includes:

s0', before ignition of the engine cylinder, the first solenoid valve is opened to introduce the first reformate (light reformate) into the engine intake passage for ignition and to improve fuel utilization.

And S1', acquiring the real-time monitoring temperature of the engine cooling water.

And S2', judging the relation between the real-time monitoring temperature of the engine cooling water and the preset temperature, and acquiring the operation condition of the engine cylinder.

S3', when the monitored temperature is higher than the upper limit value of the preset temperature, the second solenoid valve is opened, and the second reformate (light reformate) enters the engine intake passage through the second conduit, and the engine is currently in a high-load operation section. Regarding high load operation, the engine is considered to be in a high load operation section when the monitored cooling water temperature is higher than 95 degrees celsius.

So far, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. It is to be noted that, in the attached drawings or in the description, the implementation modes not shown or described are all the modes known by the ordinary skilled person in the field of technology, and are not described in detail. Further, the above definitions of the various elements and methods are not limited to the various specific structures, shapes or arrangements of parts mentioned in the examples, which may be easily modified or substituted by those of ordinary skill in the art.

From the above description, those skilled in the art should clearly recognize that the engine combustion regulation structure and method based on cold flame reforming of the present disclosure.

In summary, the present disclosure provides an engine combustion regulation and control structure and method based on cold flame reforming, which inputs a reformate with a suitable reforming degree according to different working conditions, so as to control the working state of an engine in real time, effectively improve the combustion efficiency of the engine, and realize accurate and flexible control of the combustion of the engine.

It should also be noted that directional terms, such as "upper", "lower", "front", "rear", "left", "right", and the like, used in the embodiments are only directions referring to the drawings, and are not intended to limit the scope of the present disclosure. Throughout the drawings, like elements are represented by like or similar reference numerals. Conventional structures or constructions will be omitted when they may obscure the understanding of the present disclosure.

And the shapes and sizes of the respective components in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present disclosure. Furthermore, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

Unless otherwise indicated, the numerical parameters set forth in the specification and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by the present disclosure. In particular, all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as being modified in all instances by the term "about". Generally, the expression is meant to encompass variations of ± 10% in some embodiments, 5% in some embodiments, 1% in some embodiments, 0.5% in some embodiments by the specified amount.

Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

The use of ordinal numbers such as "first," "second," "third," etc., in the specification and claims to modify a corresponding element does not by itself connote any ordinal number of the element or any ordering of one element from another or the order of manufacture, and the use of the ordinal numbers is only used to distinguish one element having a certain name from another element having a same name.

In addition, unless steps are specifically described or must occur in sequence, the order of the steps is not limited to that listed above and may be changed or rearranged as desired by the desired design. The embodiments described above may be mixed and matched with each other or with other embodiments based on design and reliability considerations, i.e., technical features in different embodiments may be freely combined to form further embodiments.

Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that is, the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, disclosed aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.

The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present disclosure in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present disclosure and are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.

Claims

1. An engine combustion regulation structure based on cold flame reforming, comprising:

a first reformate input unit comprising:

a second reformate input unit comprising:

2. The cold flame reforming-based engine combustion regulation structure of claim 1, wherein the detection unit comprises:

3. The cold flame reforming-based engine combustion regulation structure of claim 1, wherein the first solenoid valve is opened when the monitored temperature is less than the preset temperature.

4. The cold flame reforming-based engine combustion regulation structure of claim 1, wherein the second solenoid valve is opened when the monitored temperature is greater than the preset temperature.

5. The cold flame reforming-based engine combustion regulation structure of claim 1, wherein the preset temperature range is 85 to 95 degrees celsius.

6. The engine combustion regulation structure based on cold flame reforming of claim 1, wherein the first reformate is a light reformate, and the light reformate is a mixed gas having a ratio of peroxide to carbonyl peroxide of 0.15% to 0.4% and a concentration of 1500ppm to 4000 ppm.

7. The engine combustion regulation structure based on cold flame reforming of claim 1, wherein the second reformate is a heavy reformate, and the heavy reformate is a mixed gas having a ratio of olefins to aldehydes of 1% to 5% and a concentration of 10000ppm to 50000 ppm.

8. An engine combustion regulation and control method based on cold flame reforming comprises the following steps:

9. The engine combustion regulation and control method based on cold flame reforming as claimed in claim 8, wherein the step of judging the relationship between the real-time monitored temperature of the engine cooling water and the preset temperature, and after obtaining the operation condition of the engine cylinder, further comprises the following steps:

10. The engine combustion regulation method based on cold flame reforming of claim 8, wherein the obtaining of the real-time monitored temperature of engine cooling water further comprises: