CN111188688B - Thermoelectric ratio adjusting method for distributed energy system of gas engine - Google Patents
Thermoelectric ratio adjusting method for distributed energy system of gas engine Download PDFInfo
- Publication number
- CN111188688B CN111188688B CN202010042985.XA CN202010042985A CN111188688B CN 111188688 B CN111188688 B CN 111188688B CN 202010042985 A CN202010042985 A CN 202010042985A CN 111188688 B CN111188688 B CN 111188688B
- Authority
- CN
- China
- Prior art keywords
- gas engine
- output power
- crankshaft
- advance angle
- distributed energy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/26—Control of fuel supply
- F02C9/28—Regulating systems responsive to plant or ambient parameters, e.g. temperature, pressure, rotor speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/26—Control of fuel supply
- F02C9/32—Control of fuel supply characterised by throttling of fuel
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a thermoelectric ratio adjusting method of a distributed energy system of a gas engine, which comprises the steps of establishing a one-dimensional simulation calculation model of the gas engine to obtain the relationship among crankshaft output power, ignition advance angle and thermoelectric ratio; calculating the exhaust energy and the crankshaft output power of the gas engine according to the heat and electric quantity required by a user; giving the ignition advance angle of the gas engine by a one-dimensional simulation calculation model; according to the influence of the ignition advance angle on the output power of the crankshaft, the opening of the air inlet throttle valve is adjusted, the natural gas inlet flow of the gas engine is controlled, and the output power of the crankshaft is kept unchanged. The method can reduce the supplementary supply of the electric refrigerator and the gas boiler as much as possible under the condition of keeping the configuration of the distributed energy system unchanged, and even on the premise of not needing to be provided with supplementary supply equipment, change the ignition advance angle of the engine, and simultaneously adjust the natural gas flow and the opening degree of the throttle valve so as to flexibly adjust the thermoelectric proportion of the CCHP system and improve the energy utilization efficiency.
Description
Technical Field
The invention belongs to the technical field of combined cooling heating and power, relates to an adjusting method, and particularly relates to an adjusting method for changing the heat energy output of a system and the thermoelectric proportion of the system.
Background
In recent years, with the improvement of living standard of people, the requirement on living environment is higher and higher, so that building energy consumption and energy consumption of third industry in China are greatly increased. In order to promote building energy conservation and improve energy utilization efficiency, the state provides for vigorous development of distributed energy. The distributed energy system brings the cascade utilization of primary energy into full play, and the energy utilization efficiency of the system can reach more than 80%. Compared with the traditional energy, the distributed energy system has higher energy utilization efficiency, and mainly benefits from the cascade utilization of the energy and the loss caused by remote power transmission avoided by the near application. The driving energy of the distributed energy system takes coal, petroleum or natural gas as main fuel, and is undoubtedly the optimal choice by combining the structural transformation of energy industry in China and taking low-carbon clean natural gas as fuel. From the view of national policy and energy reform trend, the development of distributed energy of gas engines is a necessary way for the development of distributed energy.
The important factor restricting the development of the gas combined cooling heating and power technology is the change of the heat and power demand caused by the factors such as seasons, regions and the like, and the combined generation system can not meet the demands of heat load and power load of users according to the actual situation. In existing solutions, supplemental supply equipment is typically provided to meet the user's demand for heat and power, i.e., the user's demand for electrical power is supplied by the cogeneration system and the municipal power grid, the winter heat load is supplied by the cogeneration system and the gas boiler, and the summer cold load is supplied by the cogeneration system and the electric refrigeration.
This solution can to some extent meet the varying thermoelectric needs of the user, but also presents the following problems: (1) the addition of equipment such as a gas boiler, an electric refrigerator and the like increases the initial investment cost, occupies a large area, and needs to increase sensors, valves and the like to realize the accurate matching of the output energy of each supply equipment and a prime motor, so that the complexity of pipelines and an automatic control system of the system is improved; (2) when a user needs to supplement the cold and heat demands by means of a gas afterburning type device or an electric refrigerator, additional gas consumption and electricity consumption are caused, and the operation cost is increased. (3) When the strategy of 'fixing the power with the heat' is adopted, the heat demand of a user is met, the electric quantity is possibly generated to exceed the demand, and only the electric energy consumed by a simulation load can be consumed; the situation is similar when the heat is fixed by electricity, which causes much generated heat to be wasted, and the overall energy utilization efficiency of the system is reduced.
In order to reduce supplementary supply of an electric refrigerator and a gas boiler as far as possible, even on the premise of not needing supplementary supply equipment, the thermoelectric proportion of a CCHP system can be flexibly adjusted, and the energy utilization efficiency is improved. Therefore, it is necessary to study the adaptability of the change of the engine working state to the energy demand of the combined supply system.
Disclosure of Invention
In order to solve the above-mentioned drawbacks in the prior art, an object of the present invention is to provide a method for adjusting a thermoelectric ratio of a distributed energy system of a gas engine, which is capable of changing an ignition advance angle of the engine and adjusting a natural gas flow rate and a throttle opening degree at the same time to flexibly adjust the thermoelectric ratio of a CCHP system and improve energy utilization efficiency while keeping a configuration of the distributed energy system unchanged, i.e., reducing supplementary supply of an electric refrigerator and a gas boiler as much as possible, even without providing supplementary supply equipment.
The invention is realized by the following technical scheme.
A thermoelectric ratio adjusting method of a distributed energy system of a gas engine comprises the following steps:
(1) establishing a one-dimensional simulation calculation model of the gas engine according to the operation condition of the gas engine to obtain the relationship between the crankshaft output power P, the ignition advance angle theta and the thermoelectric ratio C;
(2) calculating to obtain exhaust energy Q1 and crankshaft output power P of the gas engine according to the heat Q and electric quantity E required by a user;
(3) according to the exhaust energy Q1 and the output power P of the crankshaft, giving out an ignition advance angle theta of the gas engine by a one-dimensional simulation calculation model;
(4) according to the influence of the ignition advance angle theta on the output power P of the crankshaft, the opening x of the air inlet throttle valve is adjusted, the natural gas inlet flow rate m of the gas engine is controlled, and the output power P of the crankshaft is kept unchanged.
Further, in the step (1), the one-dimensional simulation calculation model of the gas engine is performed according to the following process:
(1a) establishing a one-dimensional simulation calculation model of the gas engine through GT-POWER software, and correcting the simulation calculation model through an engine bench test to control the error between a simulation calculation result and a test result within 5%;
(1b) and carrying out simulation calculation of changing load and delaying ignition on the model to generate a relational graph of crankshaft output power P, an ignition advance angle theta and a thermoelectric ratio C.
Further, in the step (1a), the correction parameters mainly include in-cylinder combustion data, intake and exhaust pressure temperatures, and cooling water temperatures.
In addition, a temperature control valve is introduced into the model to control the exhaust temperature T, and the valve lift h of the temperature control valve of the gas engine is given according to the following formula:
T1＝T0+h-10 (2)
where T is the exhaust temperature, T0Temperature tolerance, T, for gas engine turbine blade material1M and n are adjustable parameters for the closing temperature of the one-way valve.
Further, the step (2) is carried out according to the following process:
according to the relation between the power generation and the heat recovery heat supply of the distributed energy system, the exhaust energy Q is obtained by the following formula1And crankshaft power P:
ηE＝a+bf+cf2 (3)
P(t)＝E(t)÷ηE (4)
Q1(t)＝Q(t)÷ηT (5)
wherein E (t) is the power generation amount of the distributed energy system, P (t) is the crankshaft output power of the gas engine, etaEFor the efficiency of the power generation of the distributed energy system, Q (t) for the recovered heat of the distributed energy system, Q1(t) exhaust energy of the distributed energy system, ηTIn terms of heat recovery efficiency of the distributed energy system, a, b and c are coefficients of power generation efficiency of the distributed energy system, and f is a power output ratio of the generator set.
Further, the step (3) is carried out according to the following process:
(3a) according to c ═ Q1The required thermoelectric ratio c is obtained;
(3b) according to the relation between the crankshaft output power P, the ignition advance angle theta and the thermoelectric ratio c, acquiring the ignition advance angle theta by adopting an intermediate interpolation method:
in the formula, theta1、θ2Respectively the output power P of the crankshaft under the same thermoelectric ratio1、P2The corresponding ignition advance angle.
Further, the step (4) is carried out according to the following process:
and the control unit ECU determines the air inlet throttle valve opening x and the natural gas flow m of the gas engine according to the crankshaft output power P.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. because the working parameters of the natural gas engine are directly adjusted according to the user requirements, the distributed energy system can accurately meet the user requirements, on one hand, the effect of the distributed energy system can be exerted to the maximum extent, and on the other hand, the waste of energy can be avoided.
2. Since the engine parameters are directly controlled by the ECU, the purpose of adjusting the thermoelectric ratio of the distributed energy system can be achieved by a simple operation.
3. The invention does not need to add any auxiliary equipment in the distributed energy system, thereby achieving the effect of saving the initial investment and the later maintenance cost.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention:
fig. 1 is a general diagram of a distributed energy system installation;
FIG. 2 is a flow chart of a method for adjusting the thermoelectric ratio of distributed energy sources of a gas engine according to the present invention;
FIG. 3 is a diagram showing exhaust temperature variation after the ignition timing is changed;
FIG. 4 is a graph showing the change in the thermoelectric ratio after the ignition timing has been changed;
FIG. 5 shows the thermal and electrical energy output after the ignition advance angle is changed;
FIG. 6 is a thermoelectric ratio corresponding to the ignition timing when operating at constant power;
FIG. 7 shows the relationship between the spark advance and the intake air flow at a time when the GT-power simulation crankshaft outputs 600kW of power.
In the figure: 1: an ECU; 2: a flow control valve; 3: an air cleaner; 4 a: a compressor section in the turbocharger; 4 b: a turbine section in the turbocharger; 5: an intake throttle valve; 6: an air intake intercooler; 7: a one-way valve; 8: an engine; 9: a waste heat recovery device; 10: a generator; 11: a heat exchanger.
Detailed Description
The present invention will now be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions of the present invention are provided to explain the present invention without limiting the invention thereto.
The invention relates to a thermoelectric ratio adjusting method of a distributed energy system of a gas engine, which changes the ignition advance angle of the engine and simultaneously adjusts the natural gas flow and the opening of a throttle valve under the condition of keeping the configuration of the distributed energy system of the gas engine unchanged so as to improve the output of exhaust energy. The distributed energy system arrangement is shown in fig. 1 and is composed of an engine 8, turbochargers 4a, 4b, an air cleaner 3, an intake intercooler 6, a control unit ECU1, a generator 10, a waste heat recovery device 9, a heat exchanger 11 and the like.
The invention adopts a mode of controlling natural gas flow, the opening degree of an air inlet throttle valve and the ignition advance angle of an engine through an ECU, namely three control lines shown in figure 1, namely the control lines I, III and IV, changes the operation parameters of the engine, keeps the output power of a crankshaft stable by adjusting the natural gas flow and the opening degree of the air inlet throttle valve, and further improves high-temperature exhaust energy by changing the ignition advance angle. In order to avoid the damage to turbine blades caused by overhigh exhaust temperature and reduce the service life of the turbine, the invention adds the drainage tube between the outlet of the compressor and the inlet of the turbine, utilizes the pressurized air to cool the exhaust in front of the turbine, adopts the one-way valve to control the flow of the drainage tube, and controls the opening of the valve by the ECU through the circuit II. The demands of refrigerating and heating, electric energy and domestic hot water of the user are input to the ECU of the control center through a circuit (five), so that the ECU is guided to carry out the control.
The structure, connection mode and operation principle of the present invention will be further described in detail with reference to the accompanying drawings.
Referring to fig. 1, the gas engine distributed energy apparatus of the present invention includes a gas engine part and an energy conversion device.
The gas engine intake part (dotted line frame A) comprises an air filter 3, a compressor 4a and an intake intercooler 6, air enters an intake manifold through the air filter 3 and the compressor 4a, and when the check valve 7 is opened, part of the air flows into an exhaust pipe through a flow guide pipe. Natural gas enters an air inlet pipeline through a flow control valve 2, the natural gas and air are mixed in an air inlet main pipe behind an air compressor 4, and the mixed gas enters an engine 8 through an air inlet throttle valve 5 and an air inlet intercooler 6 for combustion.
The connection mode of the gas engine exhaust part (dotted line frame B) is as follows: the engine exhaust enters the turbine 4b through the exhaust manifold, and pushes the turbine 4b to rotate so as to drive the coaxially connected compressor 4a to pressurize the air. An air inlet manifold at the rear end of the air compressor 4a is connected with an exhaust manifold through a drainage tube with a one-way valve 7, and the one-way valve 7 corresponds to different valve lifts according to the exhaust temperature and is used for controlling the exhaust temperature.
The energy conversion device (dotted box C) is connected in the following manner: the high-temperature exhaust gas enters the waste heat recovery device 9 through the turbine 4b, and then is cooled or heated. The output shaft of the engine 8 drives the generator 10 to work, and electric energy is generated. The cooling water from the cylinder liner and the intake intercooler 6 is supplied with domestic hot water through the heat exchanger 11.
Signals of the demands of refrigeration and heating quantity, electric energy and domestic water of a user side are converted into a demand exhaust temperature T and a demand crankshaft power P, the demand exhaust temperature T and the demand crankshaft power P are transmitted to the ECU1, and the ECU1 regulates and controls operation parameters such as an ignition advance angle of the engine 8 through a circuit (I), regulates and controls a valve lift of the check valve 7 through a circuit (II), regulates and controls a valve lift of the air inlet throttle valve 5 through a circuit (III), and regulates and controls a valve lift of the flow control valve 2 through a circuit (IV) to meet the demands of the user side.
The invention relates to a method for adjusting the thermoelectric ratio of distributed energy of a gas engine, which is further described in detail below with reference to the accompanying drawings, and specifically comprises the following steps:
The one-dimensional simulation calculation model of the gas engine is carried out according to the following process:
(1a) a one-dimensional simulation calculation model of the gas engine is established through GT-POWER software, and the simulation calculation model is corrected through an engine bench test, so that the error between a simulation calculation result and a test result is controlled within 5%. The correction parameters mainly comprise in-cylinder combustion data, intake and exhaust pressure temperature and cooling water temperature. In addition, in order to protect turbine blades, a one-way valve is introduced into the model, part of the pressurized air behind the air compressor is introduced into the turbine, low-temperature air is used for cooling high-temperature flue gas, so that the exhaust temperature T is controlled, and the valve lift h of the one-way valve of the gas engine is given according to the following formula:
T1＝T0+h-10 (2)
where T is the exhaust temperature, T0For the temperature resistance, T, of the turbine blade material1And m is an adjustable parameter and ranges from-1 to 1, n is an adjustable parameter, and n is m + 4.
(1b) And carrying out simulation calculation of changing load and delaying ignition on the model to generate a relational graph of crankshaft output power P, an ignition advance angle theta and a thermoelectric ratio C.
And 2, determining the exhaust energy Q1 and the crankshaft output power P of the gas engine according to the heat Q and the electric quantity E required by the user.
Determining the exhaust energy Q of the natural gas engine according to the working conditions of waste heat recovery devices such as a waste heat boiler, an absorption refrigerator and the like according to the refrigeration and heating requirements provided by users1：
Q1(t)＝Q(t)÷ηT (3)
Determining the required crankshaft power P of the natural gas engine according to the conversion efficiency of the generator by the power consumption requirement provided by a user:
ηE＝a+bf+cf2 (4)
P(t)＝E(t)÷ηE (5)
wherein E (t) is the power generation of the CCHP system, P (t) is the crankshaft power of the CCHP system, ηEFor efficiency of power generation of the CCHP system, Q (t) is the recovered heat of the CCHP system, Q1(t) exhaust energy of CCHP system, ηTIn the heat recovery efficiency of the CCHP system, a, b and c are coefficients of the power generation efficiency of the CCHP system, and f is the output ratio of the generator set.
And 3, according to the exhaust energy Q1 of the natural gas engine and the output power P of the crankshaft, giving the ignition advance angle theta of the gas engine by a one-dimensional simulation calculation model.
(3a) According to c ═ Q1The required thermoelectric ratio C is obtained;
(3b) according to the relation between the crankshaft output power P, the ignition advance angle theta and the exhaust temperature T, acquiring the ignition advance angle theta by adopting an intermediate interpolation method:
in the formula, theta1、θ2Respectively the output power P of the crankshaft under the same thermoelectric ratio1、P2The corresponding ignition advance angle.
And 4, adjusting the opening x of the air inlet throttle valve according to the influence of the ignition advance angle theta on the output power P of the crankshaft, controlling the flow m of natural gas of the gas engine, and keeping the output power P of the crankshaft unchanged.
Since the delay in ignition results in a reduction in crankshaft power, the intake throttle opening x must be increased to control the natural gas intake flow rate m to provide more fuel for in-cylinder combustion and thereby maintain a steady crankshaft output P.
The ignition advance angle is a key parameter for the operation of a natural gas engine and has important influence on the combustion process in a cylinder. The ignition is delayed when the ignition advance angle is adjusted to be small, so that the combustion starting time of fuel in a cylinder is delayed, more fuel is combusted after the top dead center, the explosion pressure of an engine is reduced, the output work of a crankshaft is reduced, the exhaust temperature is increased, the exhaust energy is increased, and vice versa.
Ignition cannot be retarded indefinitely and there should be a late ignition limit. The invention recommends to limit the delay of the ignition mainly considering two factors: 1) the fuel is completely combusted before the exhaust valve is opened, and the burnt mass fraction exceeds 98.5%. As a result of the model simulation calculations performed by the present invention for a 12V190 engine of the winning group, when the spark advance angle is less than 12 ° CA BTDC, more than 1.5% of the fuel is not combusted when the exhaust valve is opened, so ignition delay to 12 ° CA BTDC is not recommended. 2) The exhaust temperature should not be too high to cause damage to the turbine blades.
Fig. 3 shows the variation of the exhaust temperature with the spark advance. The examples in the figure 300kW, 400kW, 500kW and 600kW refer to the crankshaft output power. The graph shows that the exhaust temperature is continuously increased along with the delay of the ignition advance angle, when the ignition is delayed to 22-20 CA BTDC, the variation amplitude of the exhaust temperature along with the ignition advance angle is reduced, because the one-way valve of the draft tube is opened, the draft tube introduces fresh air into the exhaust pipe to cool the exhaust, and the result shows that the maximum vortex front exhaust temperature can be controlled below 650 ℃. The delay of the ignition advance angle leads to the fact that after the combustion process in the cylinder is pushed, more fuel is combusted in the downward expansion stroke of the piston, the temperature in the cylinder before the exhaust valve is opened is high, and the exhaust temperature is directly increased.
In addition, the energy-saving heat preservation performance of the exhaust passage and the exhaust manifold is emphasized in simulation and experiments, and the invention finds that the exhaust temperature of the exhaust pipe 0-200 mm away from the exhaust valve is reduced quickly by aiming at the 12V190 engine of the prevailing group, and the exhaust temperature after 200mm is basically unchanged because the exhaust passage and the exhaust manifold are not provided with heat preservation coatings and the pipe wall of the exhaust main pipe is provided with a silicate heat preservation coating when the exhaust pipe model is built.
Fig. 4 shows the thermoelectric ratio change under the above-described advance ignition condition. The examples in the figure 300kW, 400kW, 500kW and 600kW refer to the crankshaft output power. As can be seen from the figure, as the ignition advance angle is retarded, the thermoelectric ratio is gradually increased, such as: at 500kW engine power, the thermoelectric ratio increased from 0.97 to 1.05 with the spark advance retarded from 30 to 24 CA BTDC. As power increases, the thermoelectric ratio decreases, such as: at an ignition advance angle of 22 CA BTDC, the thermoelectric ratio is 1.20 under the condition of 300kW, and the thermoelectric ratio is 1.05 under the condition of 600 kW.
Fig. 5 shows the thermal energy output and the electric energy output under the above ignition advance angle condition. The examples in the figure 300kW, 400kW, 500kW and 600kW refer to the crankshaft output power. It can be seen that under the condition that the electric energy output is controlled to be a certain value, the heat energy output has a change space of 250-400 kW. For example, when the electric energy output is controlled at 300kW, the thermal energy output can be adjusted between 300kW and 550 kW. And within the power range of 300 kW-600 kW, the heat energy output span can reach a wide range of 300 kW-950 kW.
Therefore, the change of the ignition advance angle of the natural gas engine can change the exhaust temperature and the thermoelectric ratio, expand the heat energy output range of the engine and provide a wide optional range for the heat energy output of the combined cooling heating and power system. Therefore, the control unit ECU of the natural gas engine can conveniently and reliably adjust the heat-electricity ratio of the combined cooling, heating and power system.
Specific examples are given below to further illustrate the practice of the present invention.
The invention takes a 12V190 diesel generator set test of the Shandong Shengli oil field power group as an example, and obtains data to establish an engine model.
The method comprises the following specific steps:
(1) and establishing a one-dimensional model of the gas turbine according to the GT-power, and correcting the model through an engine experiment to obtain a one-dimensional engine model with an error less than 5%. Wherein, a one-way valve lift table 1 is obtained by calculation according to the formula, and the table is based on that the ignition advance angle is in a range of 34-8 CA BTDC, and the tolerance temperature T of the turbine blade material is taken0873K, the shutdown temperature T1Is 863K.
TABLE 1 temperature control valve settings
(2) The exhaust temperature corresponding to the ignition advance angle at the time of constant power operation and the thermoelectric ratio corresponding to the ignition advance angle at the time of constant power operation are obtained by model calculation, and are respectively shown in the following table 2 and fig. 6.
TABLE 2 exhaust temperature corresponding to ignition advance angle at constant power operation
(3) Assuming that the user's required heat Q is 570kW, the required power is 480kW, and the conversion rates are all 0.8, the exhaust energy Q1 of the gas engine is 712.5kW and the output power of the crankshaft is 600kW according to the formulas (1) (2).
P(t)＝E(t)÷ηE＝480÷0.8＝600
Q1(t)＝Q(t)÷ηT＝570÷0.8＝712.5
(4) According to c ═ Q1and/P, obtaining the required thermoelectric ratio of 1.2, then obtaining the required thermoelectric ratio by inquiring the graph 1 when the output power of the crankshaft is 600kW, and obtaining the required ignition advance angle of 16 CA.
(5) When the ignition advance angle is known to be 16 degrees CA, the ignition advance angle of the engine is adjusted to 16 degrees CA through calibration software INCA, the ECU of the control unit adjusts the opening degree of an air inlet throttle valve to keep the output power stable at 600kW, the air inlet flow is controlled to be 1705kg/h, and the relationship between the ignition advance angle and the air inlet flow is obtained through Gt-power simulation and is shown in FIG. 7. Through the adjustment, the output power of the crankshaft is kept at 600kW, the exhaust energy is changed to 712kW, and the expected purpose is achieved.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (5)
1. A thermoelectric ratio adjusting method of a distributed energy system of a gas engine is disclosed, wherein the distributed energy system comprises the gas engine, a turbocharger, an air filter, an air intake intercooler, a control unit ECU, a generator, a waste heat recovery device and a heat exchanger, and the turbocharger comprises a gas compressor and a turbine; a drainage tube is added between the outlet of the compressor and the inlet of the turbine, the pressurized air is used for cooling the exhaust gas in front of the turbine, and the flow of the drainage tube is controlled by adopting a one-way valve; mixing natural gas and air in an air inlet main pipe behind the air compressor, and allowing the mixed natural gas and air to enter a gas engine for combustion through an air inlet throttle valve and an air inlet intercooler;
characterized in that the method comprises the following steps:
(1) establishing a one-dimensional simulation calculation model of the gas engine according to the operation condition of the gas engine to obtain the relationship between the crankshaft output power P, the ignition advance angle theta and the thermoelectric ratio C;
(2) calculating to obtain the exhaust energy Q of the gas engine according to the heat Q and the electric quantity E required by the user1And crankshaft output power P;
(3) according to exhaust energy Q1The crankshaft output power P is obtained by a one-dimensional simulation calculation model to obtain the ignition advance angle theta of the gas engine;
the step (3) is carried out according to the following process:
(3a) according to C = Q1The required thermoelectric ratio C is obtained;
(3b) according to the relation between the crankshaft output power P, the ignition advance angle theta and the thermoelectric ratio C, acquiring the ignition advance angle theta by adopting an intermediate interpolation method:
θ=θ2+（θ1-θ2）×（P2-P）/( P2- P1) （6）
in the formula, theta1、θ2Respectively the output power P of the crankshaft under the same thermoelectric ratio1、P2A corresponding ignition advance angle;
(4) according to the influence of the ignition advance angle theta on the output power P of the crankshaft, the opening x of the air inlet throttle valve is adjusted, the natural gas inlet flow m of the gas engine is controlled, and the output power P of the crankshaft is kept unchanged.
2. The method for adjusting the thermoelectric ratio of the distributed energy system of the gas engine as claimed in claim 1, wherein in the step (1), the one-dimensional simulation calculation model of the gas engine is performed as follows:
(1a) establishing a one-dimensional simulation calculation model of the gas engine through GT-POWER software, and correcting the simulation calculation model through an engine bench test to control the error between a simulation calculation result and a test result within 5%;
(1b) and carrying out simulation calculation of changing load and delaying ignition on the model to generate a relational graph of crankshaft output power P, an ignition advance angle theta and a thermoelectric ratio C.
3. The gas engine distributed energy system thermoelectric ratio adjustment method according to claim 2, wherein in the step (1a), the correction parameters mainly include in-cylinder combustion data, intake and exhaust pressure temperature data, and cooling water temperature data;
introducing a one-way valve in the model to control the exhaust temperature T, and calculating the valve lift h and the closing temperature T of the one-way valve according to the following formula1：
h = (T-T) when h is less than or equal to 40)/5+m
h>At 4, h = (T-T)0-20)/10+n (1)
T1=T0+h-10 (2)
Where T is the exhaust temperature, T0For the temperature resistance, T, of the turbine blade material1M and n are adjustable parameters for the closing temperature of the one-way valve.
4. The gas engine distributed energy system heat-to-electricity ratio adjustment method according to claim 1, wherein the step (2) is performed as follows:
the crankshaft output power P and the exhaust energy are obtained by the following formulaQ1：
ηE=a+bf+cf2（3）
P(t)=E(t)/ηE（4）
Q1(t)=Q(t)/ ηT（5）
Wherein E (t) is the power generation amount of the distributed energy system, P (t) is the crankshaft output power of the gas engine, etaEFor the efficiency of the power generation of the distributed energy system, Q (t) for the recovered heat of the distributed energy system, Q1(t) exhaust energy of gas engine, ηTIn terms of heat recovery efficiency of the distributed energy system, a, b and c are coefficients of power generation efficiency of the distributed energy system, and f is a power output ratio of the generator set.
5. The gas engine distributed energy system heat-to-electricity ratio adjustment method as claimed in claim 1, wherein the step (4) is performed as follows:
and the control unit ECU determines the opening x of an air inlet throttle valve and the natural gas flow m of the gas engine according to the crankshaft output power P.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010042985.XA CN111188688B (en) | 2020-01-15 | 2020-01-15 | Thermoelectric ratio adjusting method for distributed energy system of gas engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010042985.XA CN111188688B (en) | 2020-01-15 | 2020-01-15 | Thermoelectric ratio adjusting method for distributed energy system of gas engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111188688A CN111188688A (en) | 2020-05-22 |
| CN111188688B true CN111188688B (en) | 2021-02-02 |
Family
ID=70703847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010042985.XA Active CN111188688B (en) | 2020-01-15 | 2020-01-15 | Thermoelectric ratio adjusting method for distributed energy system of gas engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111188688B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253778B (en) * | 2021-05-17 | 2022-04-01 | 中国第一汽车股份有限公司 | Engine bench test temperature boundary control system, method and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3309947A1 (en) * | 1983-03-19 | 1984-07-19 | Audi Nsu Auto Union Ag, 7107 Neckarsulm | Method and device for reducing load change reaction |
| CN201991610U (en) * | 2011-01-17 | 2011-09-28 | 福建成信绿集成有限公司 | Combined cooling, heating and power modular integrated system for small-sized internal combustion motor |
| CN102705130A (en) * | 2012-05-31 | 2012-10-03 | 哈尔滨工业大学（威海） | Ignition or oil injection time adjusting device for internal combustion engine |
| CN106121843A (en) * | 2016-08-20 | 2016-11-16 | 潍柴西港新能源动力有限公司 | A kind of natural gas engine ambient compensation closed loop control method and control system |
| CN207795405U (en) * | 2017-12-28 | 2018-08-31 | 华电郑州机械设计研究院有限公司 | A kind of internal combustion engine cogeneration and Organic Rankine Cycle coupled system |
-
2020
- 2020-01-15 CN CN202010042985.XA patent/CN111188688B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3309947A1 (en) * | 1983-03-19 | 1984-07-19 | Audi Nsu Auto Union Ag, 7107 Neckarsulm | Method and device for reducing load change reaction |
| CN201991610U (en) * | 2011-01-17 | 2011-09-28 | 福建成信绿集成有限公司 | Combined cooling, heating and power modular integrated system for small-sized internal combustion motor |
| CN102705130A (en) * | 2012-05-31 | 2012-10-03 | 哈尔滨工业大学（威海） | Ignition or oil injection time adjusting device for internal combustion engine |
| CN106121843A (en) * | 2016-08-20 | 2016-11-16 | 潍柴西港新能源动力有限公司 | A kind of natural gas engine ambient compensation closed loop control method and control system |
| CN207795405U (en) * | 2017-12-28 | 2018-08-31 | 华电郑州机械设计研究院有限公司 | A kind of internal combustion engine cogeneration and Organic Rankine Cycle coupled system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111188688A (en) | 2020-05-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106989535B (en) | Lithium bromide unit operation adjusting method based on gas distributed energy station | |
| CN111188688B (en) | Thermoelectric ratio adjusting method for distributed energy system of gas engine | |
| CN114991959A (en) | Novel flexible and efficient peak shaving system and method for coupling compressed air energy storage of gas turbine | |
| CN103195595B (en) | External feed stream heating and internal EGR strategy coordination controlling method | |
| CN108252829B (en) | Dual-channel EGR (exhaust gas recirculation) adjusting device and control method thereof | |
| JP4823799B2 (en) | Control method for internal combustion engine | |
| CN210532423U (en) | Efficient, flexible and interactive distributed energy waste heat utilization system | |
| CN207004588U (en) | A kind of more low pressure (LP) cylinder steam turbine generator set system optimization devices | |
| CN206755313U (en) | A kind of gas heat pump type heating | |
| CN204729187U (en) | A kind of distributed energy resource system based on Stirling engine | |
| CN220366464U (en) | Heating and cooling distributed energy system combined with triple co-generation | |
| CN2779078Y (en) | Air inlet temperature regulating device for air pressing unit of gas-fired turbine | |
| CN107524527B (en) | Gas turbine variable back pressure transformation system applicable to combined cycle power station | |
| CN110173371A (en) | A kind of natural gas internal combustion engine distributed energy resource system and operation method of high product effect operation | |
| CN212479398U (en) | Gas inlet system of distributed energy station gas internal combustion engine cooled by using chilled water | |
| CN220728564U (en) | Combined cooling heating and power distributed energy system | |
| CN117449986B (en) | Low-pressure EGR (exhaust gas recirculation) exhaust gas component and temperature composite regulation and control system of ammonia-fueled internal combustion engine | |
| CN209083434U (en) | A kind of combustion gas distributed power generation unit combustion air temperature control system | |
| CN216922298U (en) | Device for adjusting air inlet temperature of gas turbine compressor | |
| CN211975218U (en) | Temperature-controllable exhaust gas recirculation device for internal combustion engine | |
| CN214035888U (en) | Device for controlling air inlet temperature of gas turbine | |
| CN216157792U (en) | System for adjusting air inlet temperature of engine by utilizing waste gas and engine | |
| CN219826984U (en) | Gas-steam combined cycle system | |
| CN113047929B (en) | Marine diesel engine cylinder liner water preheating system utilizing tail gas waste heat and control method thereof | |
| CN219932314U (en) | Heat energy recovery mechanism of cogeneration unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |