阅读说明：本技术 一种燃气内燃机组的控制方法 (Control method of gas internal combustion engine set ) 是由 王绍霞 于 2021-06-28 设计创作，主要内容包括：本发明提供一种燃气内燃机组的控制方法,该控制方法包括：在确定所述当前负荷率低于预设负荷率的情况下,根据燃气内燃机组的涡轮增压器的转速,以及燃气内燃机组的节气阀的开度,调整燃气内燃机组的运行状态。该控制方法中,当燃气内燃机组的负荷率低于预设负荷率时,通过涡轮增压器的转速以及节气阀的开度,来调整进入气缸的单位体积的燃气量,使得负荷率达到85％以上,从而实现提高燃气内燃机组的负荷率的目的。(The invention provides a control method of a gas internal combustion engine set, which comprises the following steps: and under the condition that the current load rate is determined to be lower than the preset load rate, adjusting the running state of the gas internal combustion engine set according to the rotating speed of a turbocharger of the gas internal combustion engine set and the opening degree of a throttle valve of the gas internal combustion engine set. In the control method, when the load factor of the gas internal combustion engine unit is lower than the preset load factor, the gas quantity entering the cylinder in unit volume is adjusted through the rotating speed of the turbocharger and the opening degree of the throttle valve, so that the load factor reaches more than 85%, and the aim of improving the load factor of the gas internal combustion engine unit is fulfilled.)

1. A control method of a gas internal combustion engine group, characterized by comprising:

and under the condition that the current load rate is determined to be lower than the preset load rate, adjusting the running state of the gas internal combustion engine set according to the rotating speed of a turbocharger of the gas internal combustion engine set and the opening degree of a throttle valve of the gas internal combustion engine set.

2. The control method according to claim 1, wherein, when the opening degree of the throttle valve is greater than or equal to a first preset opening degree and the rotational speed of the turbocharger is less than a rated rotational speed by a first preset rotational speed, the adjusting the operating state of the gas internal combustion engine group includes at least one of:

starting an axial flow fan of the gas internal combustion engine set, and controlling the air inlet temperature within a first preset temperature;

adjusting the operating temperature of an intercooler of the gas internal combustion engine set, and controlling the operating temperature of the intercooler within a second preset temperature;

increasing the air input of high-concentration air of an air mixing device of the gas internal combustion engine set, reducing the negative pressure of a pretreatment inlet of the gas internal combustion engine set, and increasing the air concentration of a pretreatment outlet of the gas internal combustion engine set;

and firstly, the opening degree of the air door is increased, the stepping number of the stepping motor is controlled within a first stepping range, and then the opening degree of the air door is gradually decreased by taking 1 degree as the stepping opening degree according to the gas concentration of the pretreatment outlet and the temperature of the cylinder of the gas internal combustion engine set.

3. The control method according to claim 2, wherein the adjusting the operating state of the gas internal combustion engine group when the opening degree of the throttle valve is greater than or equal to a first preset opening degree and the rotational speed of the turbocharger is smaller than a rated rotational speed by a first preset rotational speed further comprises:

the nozzle ring with the smaller air inlet angle is replaced to increase the flow speed of the exhaust gas entering the turbocharger, so that the rotating speed of the turbocharger is increased.

4. The control method according to claim 2,

the first preset opening is 80% of the maximum opening of the throttle valve; and/or the presence of a gas in the gas,

the first preset rotating speed is 30 r/s; and/or the presence of a gas in the gas,

the first preset temperature is 30 ℃; and/or the presence of a gas in the gas,

the second preset temperature is 40 ℃; and/or the presence of a gas in the gas,

the first further range is 600 to 800.

5. The control method according to claim 1, wherein the adjusting the operating state of the gas internal combustion engine group when the rotational speed of the turbocharger has reached a rated rotational speed and the opening degree of the throttle valve is lower than a second preset opening degree comprises at least one of:

starting an air preheating function of the gas internal combustion engine set, and controlling the air inlet temperature to be higher than a third preset temperature;

adjusting the operating temperature of an intercooler of the gas internal combustion engine set, and controlling the operating temperature of the intercooler within a preset temperature range;

reducing the air input of high-concentration air of an air mixing device of the gas internal combustion engine set, increasing the negative pressure of a pretreatment inlet of the gas internal combustion engine set, and reducing the gas concentration of a pretreatment outlet of the gas internal combustion engine set;

the opening degree of an air door of the gas internal combustion engine set is reduced, the stepping number of a stepping motor of the gas internal combustion engine set is controlled within a second stepping range, and then the opening degree of the air door is gradually increased by taking 1 degree as the stepping opening degree according to the gas concentration of the pretreatment outlet and the temperature of a cylinder of the gas internal combustion engine set.

6. The control method according to claim 5, wherein the adjusting the operating state of the gas internal combustion engine group when the opening degree of the throttle valve is greater than or equal to a first preset opening degree and the rotational speed of the turbocharger is smaller than a rated rotational speed by a first preset rotational speed further comprises:

the nozzle ring with the larger air inlet angle is replaced to reduce the flow rate of the exhaust gas entering the turbocharger so as to reduce the rotation speed of the turbocharger.

7. The control method according to claim 5,

the second preset opening degree is 50 degrees; and/or the presence of a gas in the gas,

the third preset temperature is 40 ℃; and/or the presence of a gas in the gas,

the preset temperature range is 40-50 ℃; and/or the presence of a gas in the gas,

the second step range is-1300 to-110.

Technical Field

The invention relates to the technical field of power generation, in particular to a control method of a gas internal combustion engine set.

Background

Generally, the rated power of a gas internal combustion engine unit (hereinafter referred to as a unit) is 3905kW, when the supply gas concentration is 30% -50%, the load factor of the unit during normal operation is above 90%, and actually, the load factor of the unit is only 75%, even only 65% frequently when the supply gas concentration is different. Under the condition of sufficient air supply, the output of the unit is seriously influenced, the energy consumption is increased, and the completion of a power generation task is influenced.

In view of the above situation, a unit manufacturer can solve the problem of low load rate by methods such as adjusting the ignition angle and the cylinder temperature curve of a unit through a 'yellow key' (unit parameter control software). However, this method has the following problems: 1. the adjustment is not timely, and when the equipment has problems, a manufacturer cannot perform the adjustment on site in real time; 2. the cost is high, even if field workers master the adjustment method of the 'yellow key', the 'yellow key' still needs to be purchased from manufacturers every year, and the cost is high; 3. at concentrations below 30% or above 45%, even with adjustments to the firing angle or cylinder temperature profile, there is very limited increase in the unit load rate, which does not substantially exceed 300 kW.

Based on this, the prior art is certainly subject to improvement.

Disclosure of Invention

The invention aims to solve the technical problem that the load factor is still low in the existing control method of the gas internal combustion engine set.

In order to solve the above problems, the present invention provides a method for controlling a gas internal combustion engine set, which adopts the following technical scheme:

the control method comprises the following steps:

and under the condition that the current load rate is determined to be lower than the preset load rate, adjusting the running state of the gas internal combustion engine set according to the rotating speed of a turbocharger of the gas internal combustion engine set and the opening degree of a throttle valve of the gas internal combustion engine set.

Optionally, in a case where the opening degree of the throttle valve is greater than or equal to a first preset opening degree and the rotation speed of the turbocharger is less than the rated rotation speed by at least a first preset rotation speed, the adjusting the operating state of the gas internal combustion engine set includes at least one of:

starting an axial flow fan of the gas internal combustion engine set, and controlling the air inlet temperature within a first preset temperature;

adjusting the operating temperature of an intercooler of the gas internal combustion engine set, and controlling the temperature of the intercooler within a second preset temperature;

increasing the air input of high-concentration air of an air mixing device of the gas internal combustion engine set, reducing the negative pressure of a pretreatment inlet of the gas internal combustion engine set, and increasing the air concentration of a pretreatment outlet of the gas internal combustion engine set;

and firstly, the opening degree of the air door is increased, the stepping number of the stepping motor is controlled within a first stepping range, and then the opening degree of the air door is gradually decreased by taking 1 degree as the stepping opening degree according to the gas concentration of the pretreatment outlet and the temperature of the cylinder of the gas internal combustion engine set.

Optionally, when the opening degree of the throttle valve is greater than or equal to a first preset opening degree and the rotation speed of the turbocharger is smaller than the rated rotation speed by a first preset rotation speed, the adjusting the operating state of the gas internal combustion engine set further includes:

and replacing the nozzle ring with a smaller air inlet angle to increase the rotating speed of the turbocharger.

Optionally, the first preset opening is 80% of a maximum opening of the throttle valve; and/or the presence of a gas in the gas,

the first preset rotating speed is 30 r/s; and/or the presence of a gas in the gas,

the first preset temperature is 30 ℃; and/or the presence of a gas in the gas,

the second preset temperature is 40 ℃; and/or the presence of a gas in the gas,

the first further range is 600 to 800.

Optionally, when the rotation speed of the turbocharger reaches the rated rotation speed and the opening degree of the throttle valve is lower than a second preset opening degree, the adjusting the operation state of the gas internal combustion engine set comprises at least one of the following steps:

starting an air preheating function of the gas internal combustion engine set, and controlling the air inlet temperature to be higher than a third preset temperature;

adjusting the operating temperature of an intercooler of the gas internal combustion engine set, and controlling the operating temperature of the intercooler within a preset temperature range;

reducing the air input of high-concentration air of an air mixing device of the gas internal combustion engine set, increasing the negative pressure of a pretreatment inlet of the gas internal combustion engine set, and reducing the gas concentration of a pretreatment outlet of the gas internal combustion engine set;

the opening degree of an air door of the gas internal combustion engine set is reduced, the stepping number of a stepping motor of the gas internal combustion engine set is controlled within a second stepping range, and then the opening degree of the air door is gradually increased by taking 1 degree as the stepping opening degree according to the gas concentration of the pretreatment outlet and the temperature of a cylinder of the gas internal combustion engine set.

Optionally, when the opening degree of the throttle valve is greater than or equal to a first preset opening degree and the rotation speed of the turbocharger is smaller than the rated rotation speed by a first preset rotation speed, the adjusting the operating state of the gas internal combustion engine set further includes:

and replacing the nozzle ring with a larger air inlet angle to reduce the rotating speed of the turbocharger.

Optionally, the second preset opening degree is 50 °; and/or the presence of a gas in the gas,

the third preset temperature is 40 ℃; and/or the presence of a gas in the gas,

the preset temperature range is 40-50 ℃; and/or the presence of a gas in the gas,

the second step range is-1300 to-1100.

The invention has the beneficial effects that:

when the load factor of the gas internal combustion engine set is lower than the preset load factor, the gas quantity entering the cylinder in unit volume is adjusted through the rotating speed of the turbocharger and the opening degree of the throttle valve, so that the load factor reaches more than 85%, and the purpose of improving the load factor of the gas internal combustion engine set is achieved.

Detailed Description

The following examples are given to further illustrate the embodiments of the present invention.

The invention provides a control method of a gas internal combustion engine set, in the control method, when the load factor of the gas internal combustion engine set is lower than the preset load factor, the gas quantity of a unit volume entering a cylinder is adjusted through the rotating speed of a turbocharger and the opening degree of a throttle valve, so that the load factor reaches more than 85 percent, and the aim of improving the load factor of the gas internal combustion engine set is fulfilled.

Illustratively, the control method includes: and under the condition that the current load rate is determined to be lower than the preset load rate, adjusting the running state of the gas internal combustion engine set according to the rotating speed of a turbocharger of the gas internal combustion engine set and the opening degree of a throttle valve of the gas internal combustion engine set.

The method comprises the following steps of adjusting the running state of the gas internal combustion engine set according to the rotating speed of a turbocharger of the gas internal combustion engine set and the opening degree of a throttle valve of the gas internal combustion engine set, wherein the two conditions are mainly included.

In the case of the situation 1 that is described,

when the opening degree of the throttle valve is larger than or equal to a first preset opening degree and the rotating speed of the turbocharger is smaller than the rated rotating speed by a first preset rotating speed, the operating state of the gas internal combustion engine set is adjusted, and the operating state comprises at least one of the following conditions:

in the first mode, an axial flow fan of the gas internal combustion engine set is started, and the air inlet temperature is controlled within a first preset temperature;

in the second mode, the operation temperature of an intercooler of the gas internal combustion engine set is adjusted, and the operation temperature of the intercooler is controlled within a second preset temperature;

in the third mode, the air inflow of high-concentration air of the air mixing device of the gas internal combustion engine set is increased, the negative pressure of a pretreatment inlet of the gas internal combustion engine set is reduced, and the gas concentration of a pretreatment outlet of the gas internal combustion engine set is increased;

and in the fourth mode, the opening degree of the air door is firstly increased, the stepping number of the stepping motor is controlled within a first stepping range, and then the opening degree of the air door is gradually decreased by taking 1 degree as the stepping opening degree according to the gas concentration of the pretreatment outlet and the temperature of the cylinder of the gas internal combustion engine set. And in the adjusting process, the cylinder temperature of the gas internal combustion engine is ensured to be above 250 ℃, and the cylinder temperature of the gas internal combustion engine has a rising trend along with the adjustment of the opening degree of the air door and is gradually stabilized within the range of +/-25 ℃ of the rated temperature.

Wherein the first preset opening degree may be 80% of the maximum opening degree of the throttle valve, and the first preset rotation speed may be 30 r/s. That is, when the opening degree of the throttle valve is equal to or greater than 80% of the maximum opening degree and the rotational speed of the turbocharger is at least 30r/s less than the rated rotational speed, the load factor can be increased by the four methods described above.

In a first manner, the first preset temperature may be 30 ℃. In the mode, after the axial flow fan is started, the air inlet temperature of the gas internal combustion engine set is controlled below 30 ℃ by controlling the axial flow fan, so that the phenomenon that the air inlet temperature is too high is avoided, and the load factor of the gas internal combustion engine set is improved to a certain extent.

In a second manner, the second preset temperature may be 40 ℃. In the mode, the temperature of the intercooler is controlled below 40 ℃ by adjusting the operating temperature of the intercooler stage, so that the overhigh temperature of the intercooler is avoided, and the load factor of the gas internal combustion engine set can be improved to a certain degree.

In the third mode, the gas concentration at the pretreatment outlet can be increased by increasing the air inflow of high-concentration gas in the gas mixing device and reducing the negative pressure at the pretreatment inlet, so that the load factor of the gas internal combustion engine set is improved to a certain extent.

In theory, the load factor can be increased by increasing the intake air amount of the high concentration gas of the gas mixing device, but since the price of the high concentration gas is much higher than that of the low concentration gas in production and operation, the intake air amount of the high concentration gas is not increased in consideration of the power generation cost in actual operation.

In a fourth manner, the first further range may be 600 to 800.

The opening internal setting program of the stepping motor of the mixer is as follows: with the enlargement of the air door, the stepping number of the stepping motor is increased; as the air door is adjusted smaller, the number of steps of the stepper motor will decrease. Therefore, in this aspect, the opening degree of the air valve may be first adjusted to be large so as to control the number of steps of the stepping motor to be about 800 (e.g., 600 to 800), and then the opening degree of the air valve may be more finely adjusted specifically according to the gas concentration at the outlet of the pretreatment and the cylinder temperature condition of each gas internal combustion engine group.

Wherein, in case 1, adjusting the operating state of the gas internal combustion engine set may further include:

in a fifth mode, the nozzle ring and the volute of the turbocharger are replaced to increase the rotational speed of the turbocharger. For example, an existing turbocharger can be used to increase the rotational speed of the turbocharger by replacing the nozzle ring with a small intake angle and the volute of the turbocharger, thereby increasing the efficiency of the turbocharger and further increasing the load factor of the gas internal combustion engine set.

It should be noted that the above five modes can be adopted simultaneously, or only any one or more modes can be adopted. The control method can at least improve the load of the gas internal combustion engine set by 300-600 kw through the parameter adjustment, and further improve the load rate of the gas internal combustion engine set to more than 85%.

In the case of 2, the first and second cases,

when the rotating speed of the turbocharger reaches the rated rotating speed and the opening degree of the throttle valve is lower than a second preset opening degree, the operation state of the gas internal combustion engine set is adjusted, and the operation state can comprise at least one of the following conditions:

in the first mode, the air preheating function of the gas internal combustion engine unit is started, and the air inlet temperature is controlled to be higher than a third preset temperature;

in the second mode, the operating temperature of an intercooler table of the gas internal combustion engine set is adjusted, and the temperature of the intercooler is controlled within a preset temperature range;

in the third mode, the air inflow of high-concentration air of the air mixing device of the gas internal combustion engine set is reduced, the negative pressure of a pretreatment inlet of the gas internal combustion engine set is increased, and the gas concentration of a pretreatment outlet of the gas internal combustion engine set is reduced;

and in the fourth mode, the opening degree of an air door of the gas internal combustion engine set is firstly adjusted to be small, the step number of a stepping motor of the gas internal combustion engine set is controlled within a second step range, then the opening degree of the air door is gradually increased by taking 1-degree as the step opening degree according to the concentration of the gas at the pretreatment outlet and the temperature of the air cylinder of the gas internal combustion engine set, the temperature of the air cylinder of the gas internal combustion engine is ensured to be below 400 ℃ in the adjustment process, and the temperature of the air cylinder of the gas internal combustion engine has a descending trend along with the increase of the opening degree of the air door and is gradually stabilized within a range of +/-25 ℃ of the rated temperature.

Wherein the second preset opening degree may be 50 °. That is, when the rotational speed of the turbocharger reaches the rated rotational speed and the opening degree of the throttle valve is less than 50 °, the load factor can be increased in the four ways described above.

In the first manner, the third preset temperature may be 40 ℃. In the mode, the air preheating function of the gas internal combustion engine unit can be started, and the air inlet temperature is controlled to be more than 40 ℃ so as to avoid the over-low air inlet temperature and improve the load factor to a certain extent.

In a second manner, the preset temperature may be 40 ℃ to 50 ℃. In the mode, the temperature of the intercooler is controlled to be about 45 ℃ (for example, between 40 ℃ and 50 ℃) by adjusting the cooling operation temperature of the intercooler table, so that the temperature of the intercooler is prevented from being too high or too low, the temperature of the intercooler is kept in a relatively stable state, and the load factor of the gas internal combustion engine set can be improved to a certain degree.

In the third mode, the gas concentration at the pretreatment outlet can be reduced by reducing the air inflow of high-concentration gas in the gas mixing device and increasing the negative pressure at the pretreatment inlet, so that the load factor of the gas internal combustion engine set is improved to a certain extent.

In addition, since the price of the high-concentration gas is much higher than that of the low-concentration gas in the production and management, it is possible to give priority to increasing the load factor in order to reduce the cost in consideration of the power generation cost in the actual operation.

In a fourth mode, the second step range may be-1300 to-1100.

The opening degree of the air valve is firstly adjusted to be small, the stepping number of the stepping motor is controlled to be about-1200 (for example-1300 to-1100), and then the opening degree of the air valve is more finely adjusted according to the gas concentration at the outlet of the pretreatment and the cylinder temperature condition of each gas internal combustion engine set.

Wherein, in case 2, adjusting the operating state of the gas internal combustion engine set may further include:

in a fifth mode, the nozzle ring of the turbocharger is replaced to reduce the rotational speed of the turbocharger. For example, the existing turbocharger can be utilized, the nozzle ring with the larger air inlet angle is replaced, the rotating speed of the turbocharger is reduced, the opening degree of the throttle valve is increased, the throttle valve is prevented from being jammed, the normal load operation of the gas internal combustion engine unit can be ensured, and the load factor of the gas internal combustion engine unit is further improved.

It should be noted that the above five modes can be adopted simultaneously, or only any one or more modes can be adopted. The control method can at least improve the load of the gas internal combustion engine set by 200-500 kw through the parameter adjustment, and further improve the load rate of the gas internal combustion engine set to more than 85%.

In the control method, the situation that the load rate of the gas internal combustion engine set is not high when the concentration is high or low can be solved in time by optimally adjusting the parameters. If the load factor can not be increased to more than 85% by parameter adjustment, the load factor can be further increased by the modification of the turbine side of the turbocharger, so that the load factor is increased to more than 85%.

In one specific embodiment, the concentration of the gas at the pretreatment outlet is 30%, the negative pressure at the pretreatment inlet is-3.7 kPa, when the 6# gas internal combustion engine set runs at 2890kW, the rotating speed of the turbocharger is close to the rated rotating speed 690r/s, the opening of the throttle valve is 50.4%, the air temperature is 35 ℃, the temperature of the intercooler is 33 ℃, the stepping number of the stepping motor is-380, the opening of the air door is 53 degrees, and the gas internal combustion engine set cannot load.

Under the condition, the air preheating function is started, the air temperature is adjusted to 45 ℃, the temperature of the intercooler is increased to 40 ℃, the step number is adjusted to-1200, the opening degree of the air door is adjusted to 50 degrees, the negative pressure of the pretreatment inlet is adjusted to-4.2 kPa, the gas concentration of the pretreatment outlet is-26.5%, at the moment, the load of the gas internal combustion engine unit is increased to 3150kW, and the load factor is 80.67%.

Further, after the nozzle ring of the turbocharger is replaced by the domestic 3-grade air inlet angle, the load of the gas internal combustion engine set is increased to 3550kW, and the load rate is 90.91%.

In the control method, the load of the gas internal combustion engine set is improved and the normal operation of the gas internal combustion engine set under high load is ensured by adjusting parameters such as the number of steps of the stepping motor, the opening of an air door, the temperature of an intercooler and the like, adjusting the air inflow of high-concentration gas in the gas mixing device and adjusting the opening of a throttle valve.

In addition, if the load factor of the gas internal combustion engine unit still can not reach more than 85% after the parameters are adjusted, the turbine side of the turbocharger can be modified by using related parts of the existing turbocharger according to the gas concentration condition of the pretreated outlet, the nozzle ring with a proper angle or the volute of the turbocharger can be replaced, and the efficiency of the turbocharger can be changed, so that the aim of not exceeding the corresponding parameters under the condition of improving the load can be achieved.

The parameter adjustment and the turbocharger improvement are both realized by adjusting the gas quantity entering the cylinder in unit volume, so that the purpose of improving the load factor is achieved.

The above embodiments are only for illustrating the invention and are not to be construed as limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, therefore, all equivalent technical solutions also belong to the scope of the invention, and the scope of the invention is defined by the claims.