CN117706028A

CN117706028A - Exhaust gas analysis system and method

Info

Publication number: CN117706028A
Application number: CN202211087934.4A
Authority: CN
Inventors: 李玉铭; 赵振可; 汤鑫豪; 刘来
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2022-09-07
Filing date: 2022-09-07
Publication date: 2024-03-15

Abstract

The invention discloses a tail gas analysis system and a method, wherein the tail gas analysis system comprises a tail gas collection device and a tail gas testing device; the tail gas collecting device comprises a tail gas collecting cavity, a gas inlet of the tail gas collecting cavity is communicated with a gas outlet end of the tail gas generating device, and a gas outlet of the tail gas collecting cavity is communicated with a gas inlet end of the tail gas testing device; the tail gas collecting device further comprises a condensing part, a parameter collecting part and a sample gas collecting part which are positioned in the tail gas collecting cavity and are sequentially arranged from the air inlet to the air outlet along the cavity direction. The temperature of the tail gas is reduced, the temperature impact of the high-temperature tail gas on the cavity and each part or assembly in the cavity is reduced, and the sample gas to be analyzed is ensured to be more representative; the method has the advantages that the online test and the real-time test of the emission characteristics of gaseous and particulate pollutants in the tail gas are realized, the loss of the pollutants in the tail gas in the sampling process is reduced, the test precision and the accuracy of the emission characteristics of the pollutants are improved, and the application scene of the tail gas analysis system is enlarged.

Description

Exhaust gas analysis system and method

Technical Field

The invention relates to the technical field of tail gas treatment, in particular to a tail gas analysis system and method.

Background

The tail gas is discharged by the equipment such as an aeroengine, an automobile engine, a gas turbine or a combustion generator in the running process, various pollutants are contained in the tail gas, and the equipment can be put into use only when the tail gas emission standard of the equipment meets the tail gas emission standard of related requirements, so that the tail gas discharged by the equipment needs to be tested and analyzed.

Most of the existing tail gas treatment analysis systems are derived based on the traditional tail gas testing method, and most of the existing tail gas treatment analysis systems are off-line testing systems, so that real-time on-line testing analysis of tail gas discharged by equipment cannot be performed.

Disclosure of Invention

The invention aims to overcome the defect that in the prior art, a tail gas treatment analysis system cannot test and analyze the tail gas discharged by equipment on line in real time.

The invention solves the technical problems by the following technical scheme:

in a first aspect, an exhaust analysis system is provided, the exhaust analysis system comprising an exhaust collection device and an exhaust testing device;

the tail gas collecting device comprises a tail gas collecting cavity, a gas inlet of the tail gas collecting cavity is communicated with a gas outlet end of the tail gas generating device, and a gas outlet of the tail gas collecting cavity is communicated with a gas inlet end of the tail gas testing device;

The tail gas collecting device further comprises a condensing part, a parameter collecting part and a sample gas collecting part which are positioned in the tail gas collecting cavity and are sequentially arranged from the air inlet to the air outlet along the cavity direction;

the condensing part is used for cooling the tail gas input from the tail gas generating device through the air inlet so as to enable the temperature of the tail gas to accord with a preset temperature range;

the parameter acquisition component is used for acquiring the actual distribution uniformity of pollutants in the tail gas collection cavity;

the sample gas acquisition component is used for acquiring tail gas with the actual distribution uniformity conforming to a preset distribution uniformity range as sample gas to be analyzed when the actual distribution uniformity conforms to the preset distribution uniformity range, and transmitting the sample gas to be analyzed to the tail gas testing device;

the tail gas testing device is used for analyzing and obtaining emission characteristics of pollutants in the tail gas based on the sample gas to be analyzed.

Preferably, the exhaust gas analysis system further comprises a controller, and the exhaust gas collection device further comprises an agitating member;

the stirring component is arranged between the condensing component and the parameter acquisition component;

The controller is electrically connected with the stirring component;

the controller is used for driving the stirring component to stir the tail gas after the temperature-regulating and cooling treatment, so that the actual distribution uniformity of pollutants in the tail gas accords with a preset distribution uniformity range.

Preferably, the condensing part comprises a condensing net and a condenser;

the controller is electrically connected with the condenser, and the condenser is electrically connected with the condensing net;

the condensation net is arranged in the tail gas collecting cavity;

the condenser is arranged outside the tail gas collecting cavity and is used for receiving a first adjusting instruction sent by the controller and adjusting the temperature of the condensing net based on the first adjusting instruction so that the temperature of the tail gas passing through the condensing net accords with the preset temperature range.

Preferably, the condensation component comprises a plurality of condensation nets which are sequentially spaced and arranged in parallel along the cavity direction of the tail gas collection cavity.

Preferably, the agitation means comprises a fan assembly and a motor assembly;

the motor assembly is electrically connected with the corresponding fan assembly, and is electrically connected with the controller and used for driving the corresponding fan assembly to rotate;

The fan assembly is arranged in the tail gas collecting cavity;

the motor assembly is arranged outside the tail gas collecting cavity, and is further used for receiving a second adjusting instruction sent by the controller and adjusting the rotating speed of the fan assembly based on the second adjusting instruction so as to adjust the actual distribution uniformity of pollutants in the tail gas to meet the preset distribution uniformity range.

Preferably, the fan assembly comprises a first fan and a second fan which are sequentially spaced along the cavity direction of the exhaust gas collecting cavity and are arranged in parallel;

the blade size of the first fan is larger than that of the second fan;

the motor assembly comprises a first motor electrically connected with the first fan and a second motor electrically connected with the second fan;

the first motor is used for driving the first fan to rotate, and the second motor is used for driving the second fan to rotate.

Preferably, the fan assembly comprises a third fan, and the third fan comprises a plurality of first blade units and a plurality of second blade units, wherein the first blade units and the second blade units are sequentially arranged in parallel along the cavity direction of the exhaust gas collecting cavity;

The size of each blade of the first blade unit is larger than the size of each blade of the second blade unit;

the motor assembly includes a third motor;

the third motor is used for driving the third fan to rotate.

Preferably, the exhaust gas collecting device further comprises a guide plate;

the guide plate is arranged between the fan assembly and the parameter acquisition component, and is fixedly arranged in the tail gas collection cavity through a connecting piece.

Preferably, the stirring member further comprises a first bracket;

the fan assembly is arranged in the tail gas collecting cavity through the first bracket;

the first bracket is electrically connected with the motor component, and the motor component is further used for receiving a third adjusting instruction sent by the controller and driving the first bracket to move based on the third adjusting instruction so as to adjust the current interval distance between the fan component and the condensing net to meet the target interval distance;

and/or the condensing part further comprises a second bracket and a driving assembly, and the condensing net is arranged in the tail gas collecting cavity through the second bracket;

the second support is electrically connected with the driving assembly, and the driving assembly is used for receiving a fourth adjusting instruction sent by the controller and driving the second support to move based on the fourth adjusting instruction so as to adjust the current interval distance between the fan assembly and the condensing net to meet the target interval distance.

Preferably, the parameter acquisition means comprises a first sensor;

the first sensor collects the actual distribution uniformity of pollutants in the tail gas through a plurality of first sampling probes arranged in the tail gas collecting cavity, and sends the actual distribution uniformity to the controller;

the sample gas collecting component comprises an electromagnetic valve and a sample gas collecting pipeline, and the electromagnetic valve is arranged at the inlet of the sample gas collecting pipeline;

the controller is further used for generating a fifth control instruction based on the actual distribution uniformity of pollutants in the tail gas, and sending the fifth control instruction to the electromagnetic valve;

the electromagnetic valve is used for controlling the conduction of the sample gas collecting pipeline based on the fifth control instruction so as to collect the sample gas to be analyzed.

Preferably, the parameter acquisition component comprises a second sensor, and the second sensor acquires corresponding environmental parameters through a plurality of second sampling probes arranged in the tail gas collection cavity and sends the environmental parameters to the controller;

the tail gas analysis system further comprises a display device;

the display device is electrically connected with the controller and is used for receiving the environment parameters sent by the controller and driving the display device to display the environment parameters.

Preferably, the tail gas testing device comprises a sample gas analysis component;

the sample gas analysis component is used for receiving the sample gas to be analyzed through the sample gas acquisition pipeline and analyzing and obtaining the pollutant emission characteristics of the sample gas to be analyzed;

and/or, the tail gas testing device further comprises a flowmeter;

the flowmeter is used for monitoring the gas flow of the sample gas to be analyzed;

and/or the tail gas testing device further comprises a sample gas storage component;

the sample gas storage component is used for collecting and storing the sample gas to be analyzed.

Preferably, the exhaust gas analysis system further comprises a filtering and purifying device;

the filtering and purifying device is arranged on the inner side of the air outlet of the tail gas collecting cavity and is used for filtering and purifying tail gas which is conveyed into the position where the filtering and purifying device is located;

and/or, the tail gas analysis system further comprises a fan;

the fan is arranged on the outer side of the air outlet of the tail gas collecting cavity, and the fan is used for forming negative pressure in the tail gas collecting cavity.

Preferably, the tail gas analysis system is arranged on the liftable mounting frame;

and/or the exhaust gas generating device comprises an aero-engine;

The aero-engine operates under set operation parameters and discharges the tail gas;

the controller is further configured to obtain the set operation parameter and a health state of the aeroengine, determine an operation condition of the aeroengine based on the set operation parameter, and analyze the emission characteristics of the aeroengine under different operation conditions and different health states based on the operation condition and the health state;

wherein the set operating parameters include any one of engine speed, engine thrust value, fuel flow, and engine exhaust temperature margin.

In a second aspect, an exhaust gas analysis method is provided, where the exhaust gas analysis method is implemented by using any one of the exhaust gas analysis systems described above;

the tail gas analysis method comprises the following steps:

obtaining tail gas discharged by a tail gas generating device;

cooling the tail gas by adopting a condensing part, and detecting the temperature of the cooled tail gas;

judging whether the temperature of the tail gas accords with a preset temperature range;

if yes, detecting the actual distribution uniformity of pollutants in the tail gas;

when the actual distribution uniformity accords with a preset distribution uniformity range, collecting tail gas of which the actual distribution uniformity accords with the preset distribution uniformity range as sample gas to be analyzed;

And analyzing and obtaining the emission characteristics of pollutants in the tail gas based on the sample gas to be analyzed.

Preferably, when the condensing unit includes a condensing net and a condenser, the exhaust gas analysis method further includes:

and if the temperature of the tail gas does not accord with the preset temperature range, sending a first adjusting instruction to the condenser, and controlling the condenser to adjust the temperature of the condensing net based on the first adjusting instruction so as to enable the temperature of the tail gas passing through the condensing net to accord with the preset temperature range.

Preferably, when the stirring component comprises a fan assembly and a motor assembly, the step of detecting the actual uniformity of distribution of the pollutants in the exhaust gas specifically comprises:

judging whether the actual distribution uniformity of pollutants in the tail gas accords with a preset distribution uniformity range or not;

if not, a second adjusting instruction is sent to the motor assembly, so that the motor assembly adjusts the rotating speed of the fan assembly based on the second adjusting instruction, and the actual distribution uniformity of pollutants in the tail gas is adjusted to be in accordance with the preset distribution uniformity range.

Preferably, when the agitation member includes a first rack, the exhaust analysis method further includes:

Obtaining a target spacing distance between the fan assembly and the condensing net;

judging whether the current interval distance between the fan assembly and the condensing net accords with the target interval distance;

if not, a third adjusting instruction is sent to the motor assembly, so that the motor assembly drives the first bracket to move based on the third adjusting instruction, and the current interval distance is adjusted to meet the target interval distance;

and/or, when the condensing unit further comprises a second bracket and a drive assembly, the exhaust gas analysis method further comprises:

and when the current interval distance between the fan assembly and the condensing net does not meet the target interval distance, sending a fourth adjusting instruction to the driving assembly, so that the driving assembly drives the second bracket to move based on the fourth adjusting instruction, and the current interval distance is adjusted to meet the target interval distance.

Preferably, when the parameter collecting component includes a first sensor and the sample gas collecting component includes an electromagnetic valve and a sample gas collecting pipeline, the step of collecting the tail gas with the actual distribution uniformity of the pollutants in the tail gas conforming to the preset distribution uniformity range as the sample gas to be analyzed specifically includes:

When the actual distribution uniformity of the pollutants in the tail gas accords with the preset distribution uniformity range, generating a fifth control instruction based on the actual distribution uniformity of the pollutants in the tail gas, and sending the fifth control instruction to the electromagnetic valve, so that the electromagnetic valve controls the sample gas collecting pipeline to be conducted based on the fifth control instruction to collect the sample gas to be analyzed.

Preferably, when the exhaust gas generating device comprises an aeroengine, the exhaust gas analysis method comprises:

acquiring the emission characteristics of the aeroengine under set operation parameters and the health state of the aeroengine;

wherein the set operating parameters include any one of engine speed, engine thrust value, fuel flow and engine exhaust temperature margin;

determining an operating condition of the aeroengine based on the set operating parameter;

analyzing the emission characteristics of the aeroengine under different operating conditions and different health conditions based on the operating conditions and the health conditions

The invention has the positive progress effects that:

in the tail gas analysis system, the condensing part is used for cooling the tail gas, so that particle pollutants in the tail gas are cooled and condensed in the tail gas collecting cavity to simulate the process of the tail gas after entering air (or atmosphere), and meanwhile, the temperature impact of high-temperature tail gas on the cavity and all parts or components in the cavity is reduced; the method comprises the steps that the actual distribution uniformity of pollutants in the tail gas collecting cavity is collected through the parameter collecting component, when the actual distribution uniformity accords with a preset distribution uniformity range, the tail gas with the actual distribution uniformity accords with the preset distribution uniformity range is collected through the sample gas collecting component to serve as sample gas to be analyzed, the sample gas to be analyzed is transmitted to the tail gas testing device, and the collected sample gas to be analyzed is guaranteed to be more representative; the emission characteristics of pollutants in the tail gas are obtained based on the analysis of the sample gas to be analyzed through the tail gas testing device; the method has the advantages that the online test and the real-time test of the emission characteristics of gaseous and particulate pollutants in the tail gas are realized, the loss of the pollutants in the tail gas in the sampling process is reduced, and the test precision and the accuracy of the emission characteristics of the pollutants in the tail gas are improved; compared with the traditional tail gas analysis system, the tail gas analysis system has the advantages of simpler system structure and construction process and lower complexity, can be used in various test situations and environments, and expands the application scene of the tail gas analysis system.

Drawings

Fig. 1 is a schematic diagram of a first structure of an exhaust gas analysis system according to embodiment 1 of the present invention;

fig. 2 is a schematic diagram of a second structure of the exhaust gas analysis system according to embodiment 1 of the present invention;

fig. 3 is a schematic structural diagram of a condensation net in the exhaust gas analysis system provided in embodiment 1 of the present invention;

fig. 4 is a schematic structural diagram of a third fan in the exhaust gas analysis system according to embodiment 1 of the present invention;

fig. 5 is a schematic diagram of a distribution structure of a first sampling probe in the tail gas analysis system according to embodiment 1 of the present invention;

FIG. 6 is a schematic diagram of a first flow chart of an exhaust gas analysis method according to embodiment 2 of the present invention;

fig. 7 is a schematic diagram of a second flow chart of the tail gas analysis method according to embodiment 2 of the present invention;

fig. 8 is a schematic diagram of a third flow chart of an exhaust gas analysis method according to embodiment 2 of the present invention;

fig. 9 is a fourth flow chart of the tail gas analysis method provided in embodiment 2 of the present invention;

fig. 10 is a fifth flowchart of the exhaust gas analysis method provided in embodiment 2 of the present invention.

Detailed Description

The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention.

Example 1

In this embodiment, an exhaust gas analysis system is provided, fig. 1 is a schematic first structural diagram of the exhaust gas analysis system provided in this embodiment, and fig. 2 is a schematic second structural diagram of the exhaust gas analysis system provided in embodiment 1 of the present invention.

As shown in fig. 1 and 2, the exhaust gas analysis system includes an exhaust gas collection device 1 and an exhaust gas testing device 2; the tail gas collecting device 1 comprises a tail gas collecting cavity 11, an air inlet of the tail gas collecting cavity 11 is communicated with an air outlet end of the tail gas generating device, and an air outlet of the tail gas collecting cavity 11 is communicated with an air inlet end of the tail gas testing device 2; the tail gas collecting device 1 further comprises a condensing part 12, a parameter collecting part 13 and a sample gas collecting part 14 which are positioned in the tail gas collecting cavity 11 and are sequentially arranged from the air inlet to the air outlet along the direction of the cavity 111; the condensation component 12 is used for cooling the tail gas input from the tail gas generating device through the air inlet so that the temperature of the tail gas accords with a preset temperature range; the parameter acquisition component 13 is used for acquiring the actual distribution uniformity of pollutants in the tail gas collection cavity 11; the sample gas collecting component 14 is configured to collect, when the actual distribution uniformity accords with the preset distribution uniformity range, tail gas whose actual distribution uniformity accords with the preset distribution uniformity range as sample gas to be analyzed, and transmit the sample gas to be analyzed to the tail gas testing device 2; the tail gas testing device 2 is used for obtaining emission characteristics of pollutants in the tail gas based on analysis of the sample gas to be analyzed.

The emission characteristics of pollutants in the exhaust gas refer to the composition of the components, the proportion of each component and other characteristics of the pollutants in the exhaust gas.

The tail gas collecting device can be connected with the tail gas generating device through a sealing structure, so that the air tightness of the tail gas analysis system is improved.

In the tail gas analysis system, the condensing part is used for cooling the tail gas, so that particle pollutants in the tail gas are cooled and condensed in the tail gas collecting cavity to simulate the process of the tail gas after entering the air, and meanwhile, the temperature impact of the high-temperature tail gas on the cavity and all parts or components in the cavity is reduced; the method comprises the steps that the actual distribution uniformity of pollutants in the tail gas collecting cavity is collected through the parameter collecting component, when the actual distribution uniformity accords with a preset distribution uniformity range, the tail gas with the actual distribution uniformity accords with the preset distribution uniformity range is collected through the sample gas collecting component to serve as sample gas to be analyzed, the sample gas to be analyzed is transmitted to the tail gas testing device, and the collected sample gas is guaranteed to be more representative; the emission characteristics of pollutants in the tail gas are obtained based on the analysis of the sample gas to be analyzed through the tail gas testing device; the method has the advantages that the online test and the real-time test of the emission characteristics of gaseous and particulate pollutants in the tail gas are realized, the loss of the pollutants in the tail gas in the sampling process is reduced, and the test precision and the accuracy of the emission characteristics of the pollutants in the tail gas are improved; compared with the traditional tail gas analysis system, the tail gas analysis system has the advantages of simpler system structure and construction process and lower complexity, can be used in various test situations and environments, and expands the application scene of the tail gas analysis system.

In an alternative embodiment, as shown in fig. 1 and 2, the exhaust gas analysis system further comprises a controller 3, and the exhaust gas collection device 1 further comprises an agitation member 15; the stirring part 15 is arranged between the condensing part 12 and the parameter acquisition part 13; the controller 3 is electrically connected with the stirring member 15; the controller 3 is used for driving the stirring component 15 to stir the tail gas after the temperature-reducing treatment so as to lead the actual distribution uniformity of pollutants in the tail gas to conform to the preset distribution uniformity range.

The controller can also be called as an upper computer, and can be internally integrated with a signal processing device, or can be connected with an external signal processing device, and the received signals or the transmitted signals are subjected to format processing or other processing by the signal processing device so that the two sides of signal interaction can be identified.

The controller receives the actual distribution uniformity of pollutants in the tail gas collected by the parameter collection component, compares the actual distribution uniformity with a preset distribution uniformity range, and drives the stirring component to stir the tail gas subjected to the temperature regulation and reduction treatment when the actual distribution uniformity does not accord with the preset distribution uniformity range, so that the actual distribution uniformity of the pollutants in the tail gas accords with the preset distribution uniformity range, the tail gas of which the actual distribution uniformity accords with the preset distribution uniformity range is collected by the sample gas collection component to serve as sample gas to be analyzed, the collected sample gas to be analyzed is ensured to be more representative, and the testing precision and accuracy of the emission characteristics of the pollutants in the tail gas are further improved.

The tail gas collecting device can be made of stainless steel materials, so that condensation and adsorption of particulate pollutants in the tail gas are reduced, loss of the pollutants in the tail gas in the sampling process is reduced, and the collected sample gas to be analyzed is more representative.

In an alternative embodiment, as shown in FIG. 2, the condensing unit 12 includes a condensing screen 121 and a condenser 122; the controller 3 is electrically connected with the condenser 122, and the condenser 122 is electrically connected with the condensing net 121; the condensation net 121 is arranged inside the tail gas collecting cavity 11; the condenser 122 is disposed outside the exhaust gas collecting chamber 11, and the condenser 122 is configured to receive a first adjustment command sent by the controller 3 and adjust the temperature of the condensation net 121 based on the first adjustment command, so that the temperature of the exhaust gas passing through the condensation net 121 conforms to a preset temperature range.

The condenser adjusts the temperature of the condensing net according to the received first adjusting instruction, so that the temperature of the tail gas passing through the condensing net accords with a preset temperature range, particulate pollutants in the tail gas are cooled and condensed in the tail gas collecting cavity to simulate the process of the tail gas entering the air, meanwhile, the temperature impact of the high-temperature tail gas on the cavity and each part or assembly in the cavity is reduced, and the operation safety and the operation precision of each part or assembly in the cavity are ensured.

In an alternative embodiment, as shown in fig. 2, the condensation component comprises a plurality of condensation screens 121 spaced apart in sequence and arranged in parallel along the cavity direction of the exhaust gas collection chamber.

Fig. 3 is a schematic structural diagram of a condensation net in the exhaust gas analysis system according to the present embodiment, as shown in fig. 3, the condensation net may adopt a net-shaped structure layout. The number and structure of the condensation nets can be set according to actual use conditions, so long as the temperature of the tail gas passing through the condensation nets is ensured to be in accordance with a preset temperature range, for example, the condensation nets can be 2-level condensation nets. The adoption of a plurality of condensing nets can quickly and efficiently cool the tail gas passing through the condensing nets, and the efficiency of condensing the tail gas of the tail gas analysis system is improved.

In an alternative embodiment, as shown in FIG. 2, the agitation member 15 includes a fan assembly 151 and a motor assembly 152; the motor assembly 152 is electrically connected with the corresponding fan assembly 151, the motor assembly 152 is electrically connected with the controller 3, and the motor assembly 152 is used for driving the corresponding fan assembly 151 to rotate; the fan assembly 151 is disposed inside the exhaust gas collection chamber 11; the motor assembly 152 is disposed outside the exhaust gas collecting chamber 11, and the motor assembly 152 is further configured to receive a second adjustment command sent by the controller 3 and adjust the rotation speed of the fan assembly 151 based on the second adjustment command, so as to adjust the actual uniformity of distribution of pollutants in the exhaust gas to conform to a preset uniformity range.

The fan assembly is driven by the motor assembly to rotate, tail gas in the tail gas collecting cavity can be stirred in the rotating process, the rotating speed of the fan assembly can be adjusted, the tail gas can be rapidly and evenly distributed in the tail gas collecting cavity, and the actual distribution uniformity of pollutants in the tail gas is adjusted to meet the preset distribution uniformity range.

In an alternative embodiment, as shown in fig. 2, the fan assembly 151 includes a first fan and a second fan that are sequentially spaced apart and disposed in parallel along the cavity direction of the exhaust gas collection chamber 11; the blade size of the first fan is larger than that of the second fan; the motor assembly 152 includes a first motor electrically connected to the first fan and a second motor electrically connected to the second fan; the first motor is used for driving the first fan to rotate, and the second motor is used for driving the second fan to rotate.

The first fan and the second fan form a 2-stage fan structure, the blade size of the first fan is larger than that of the second fan, each fan is driven by a corresponding motor, the stirring of the tail gas by the first fan relative to the second fan is more severe under the condition that the rotating speeds of the first fan and the second fan are the same, the stirring of the tail gas by the second fan is relatively stable, and the actual distribution uniformity of pollutants in the tail gas collected by the rear parameter collection component in the running process of the fan assembly is relatively accurate; the parameter acquisition component can also acquire the actual distribution uniformity of pollutants in the tail gas after the fan assembly stops running, and the acquired actual distribution uniformity of pollutants in the tail gas is more accurate.

In an alternative embodiment, as shown in fig. 2, the fan assembly 151 includes a third fan including a first blade unit of a number of first blades and a second blade unit of a number of second blades sequentially disposed in parallel along the cavity direction of the exhaust gas collecting chamber 11; the size of each blade of the first blade unit is larger than the size of each blade of the second blade unit; the motor assembly 152 includes a third motor; the third motor is used for driving the third fan to rotate.

As shown in fig. 2, the fan assembly 151 is a third fan, which is a fan unit composed of a first blade unit and a second blade unit, and is driven by one motor.

Fig. 4 is a schematic structural diagram of a third fan in the exhaust gas analysis system provided in this embodiment, as shown in fig. 4, the size of each blade of the first blade unit is larger than that of each blade of the second blade unit, so that the stirring of the first blade unit on the exhaust gas is more intense relative to that of the second blade unit, the stirring of the second blade unit on the exhaust gas is relatively stable, and the actual distribution uniformity of pollutants in the exhaust gas collected by the parameter collection component at the rear in the process of operating the fan assembly is relatively accurate; the parameter acquisition component can also acquire the actual distribution uniformity of pollutants in the tail gas after the fan assembly stops running, and the acquired actual distribution uniformity of pollutants in the tail gas is more accurate.

The first blade unit and the second blade unit are coaxial, and the distance between the first blade unit and the second blade unit and the number of blades can be set according to actual conditions.

In an alternative embodiment, as shown in fig. 2, the exhaust gas collection device 1 further comprises a baffle 16; the baffle 16 is disposed between the fan assembly 151 and the parameter acquisition component 13, and the baffle 16 is fixedly disposed inside the exhaust gas collection chamber 11 by a connector.

Specifically, the guide plate is arranged behind the second blade unit or the second fan and in front of the parameter acquisition component, and because the fan component generates airflow disturbance in the operation process, the accuracy of the actual distribution uniformity of pollutants in tail gas acquired by the parameter acquisition component at the rear is affected.

The fan assembly can be made of high-temperature-resistant materials, so that the tail gas after cooling treatment of the condensing part can not generate high-temperature damage to the fan assembly, and the fan assembly is selected according to actual use requirements.

In an alternative embodiment, the stirring member 15 further comprises a first bracket; the fan assembly 151 is mounted inside the exhaust gas collection chamber 11 through a first bracket; the first bracket is electrically connected to the motor assembly 152, and the motor assembly 152 is further configured to receive a third adjustment instruction sent by the controller 3, and drive the first bracket to move based on the third adjustment instruction, so as to adjust the current separation distance between the fan assembly 151 and the condensation network 121 to meet the target separation distance.

The stirring part is installed in the tail gas collecting cavity through the first support, the controller can move through controlling the motor assembly to control the first support, and the first support drives the fan assembly to move, so that the distance between the fan assembly and the condensing net is adjusted, the current interval distance between the fan assembly and the condensing net meets the target interval distance, the tail gas is fully cooled and condensed, and meanwhile, the temperature impact of the tail gas temperature on the cavity of the tail gas collecting cavity is further reduced.

In an alternative embodiment, the condensing unit 12 further comprises a second bracket and a driving assembly, and the condensing net 121 is mounted inside the exhaust gas collecting chamber 11 through the second bracket; the second support is electrically connected with the driving component, and the driving component is used for receiving a fourth adjusting instruction sent by the controller 3 and driving the second support to move based on the fourth adjusting instruction so as to adjust the current interval distance between the fan component and the condensing net to meet the target interval distance.

The condensation net passes through the inside that the second support was installed in the tail gas collection chamber, and the controller can remove with control second support through control drive assembly, and the second support drives the condensation net and removes to adjust the distance between fan unit spare and the condensation net, make the current interval distance between fan unit spare and the condensation net satisfy target interval distance, make the tail gas fully cool off and condense, further reduce the temperature impact of tail gas temperature to the cavity in tail gas collection chamber simultaneously.

In an alternative embodiment, as shown in fig. 2, the parameter acquisition component 13 includes a first sensor 131; the first sensor collects the actual distribution uniformity of pollutants in the tail gas through a plurality of first sampling probes 132 arranged in the tail gas collecting cavity 11, and sends the actual distribution uniformity to the controller 3; the sample gas collecting part 14 comprises a solenoid valve 141 and a sample gas collecting pipeline 142, and the solenoid valve 141 is arranged at the inlet of the sample gas collecting pipeline 142; the controller 3 is further configured to generate a fifth control instruction based on the actual distribution uniformity of the pollutants in the exhaust gas, and send the fifth control instruction to the electromagnetic valve 141; the electromagnetic valve 141 is used for controlling the sample gas collection tube 142 to be conducted based on the fifth control command so as to collect the sample gas to be analyzed.

Fig. 5 is a schematic diagram of a distribution structure of a first sampling probe in the tail gas analysis system provided in this embodiment, as shown in fig. 5, a plurality of sampling probes are distributed according to a cross, and a cross target is used to detect actual distribution uniformity of pollutants in tail gas in a cross section of a cavity in front of each probe. The invention does not limit the distribution form of the plurality of probes, and the plurality of probes can be distributed according to the shape of a Chinese character 'mi', a Chinese character 'tian' or other distribution forms.

When the actual distribution uniformity of pollutants in the tail gas collecting cavity accords with a preset distribution uniformity range, the controller sends a fifth control instruction to the electromagnetic valve, the electromagnetic valve controls the conduction of the sample gas collecting pipeline so as to collect sample gas to be analyzed and transmit the sample gas to the tail gas testing device, and the tail gas testing device analyzes the emission characteristics of the pollutants in the tail gas based on the sample gas to be analyzed; the method realizes the online test and the real-time test of the emission characteristics of the gaseous and particulate pollutants in the tail gas, and improves the test precision and accuracy of the emission characteristics of the pollutants in the tail gas.

In an alternative embodiment, as shown in fig. 2, when the sample gas collecting pipe 142 is formed by splicing multiple sections of pipes at right angles, the sample gas collecting component 14 further includes a detachable right-angle connector 143, and the two sections of pipes are spliced together at right angles through the detachable right-angle connector 143.

In an alternative embodiment, the parameter acquisition component 13 comprises a second sensor that acquires corresponding environmental parameters through a plurality of second sampling probes arranged in the exhaust gas collection chamber 11 and sends the environmental parameters to the controller 3; the tail gas analysis system also comprises a display device; the display device is electrically connected with the controller 3, and is used for receiving the environmental parameters sent by the controller 3 and driving the display device to display the environmental parameters.

Environmental parameters including, but not limited to, temperature, humidity, and pressure within the exhaust collection chamber, which may be displayed by a display device. The number and distribution modes of the second sampling probes corresponding to the second sensors can be set according to actual use requirements.

In an alternative embodiment, as shown in fig. 2, the tail gas testing device 2 includes a sample gas analysis component 21; the sample gas analysis component 21 is configured to receive a sample gas to be analyzed via the sample gas collection line 142 and analyze the sample gas to determine a pollutant emission characteristic of the sample gas to be analyzed.

The sample gas analyzing means may be an integrated analyzer composed of various types of gas analyzers.

In an alternative embodiment, as shown in FIG. 2, the exhaust testing device 2 further includes a flow meter 22; the flow meter 22 is used to monitor the gas flow of the sample gas to be analyzed.

In an alternative embodiment, as shown in fig. 2, the exhaust testing device 2 further comprises a sample gas storage part 23; the sample gas storage section 23 is for collecting and storing a sample gas to be analyzed.

The sample gas storage means may be a collection bag for collecting and storing the sample gas to be analyzed for off-line analysis in the presence of an off-gas analysis requirement.

In an alternative embodiment, as shown in fig. 2, the exhaust gas analysis system further comprises a filtering and purifying device 4; the filtering and purifying device 4 is arranged on the inner side of the air outlet of the tail gas collecting cavity 11, and the filtering and purifying device 4 is used for filtering and purifying the tail gas which enters the position where the filtering and purifying device 4 is located.

The tail gas is directly discharged into the air to cause environmental pollution, so that the tail gas at the position where the filtering and purifying device is arranged is filtered and purified by arranging the filtering and purifying device. Such as particulate matter, CO (carbon monoxide) and UHC (unburned hydrocarbon) contaminants.

In an alternative embodiment, as shown in fig. 2, the exhaust gas analysis system further comprises a fan 5; the fan 5 sets up in the outside of the gas outlet of tail gas collection chamber 11, and fan 5 is used for forming the negative pressure to the inside of tail gas collection chamber 11.

If the negative pressure environment is needed in the tail gas collecting cavity, negative pressure can be formed in the tail gas collecting cavity through the fan.

In an alternative embodiment, the exhaust analysis system is provided on a liftable mounting frame.

The air inlet of the tail gas collecting cavity in the tail gas analysis system is communicated with the air outlet end of the tail gas generating device, so that the height of the tail gas analysis system can be adjusted through the lifting installation frame when the tail gas generating devices with different heights face each other, and the air inlet of the tail gas collecting cavity is accurately communicated with the air outlet end of the tail gas generating device.

In an alternative embodiment, the exhaust gas generating device comprises an aero-engine; the aero-engine operates under the set operation parameters and discharges tail gas; the controller is also used for acquiring set operation parameters and the health state of the aero-engine, determining the operation condition of the aero-engine based on the set operation parameters, and analyzing the emission characteristics of the aero-engine under different operation conditions and different health states based on the operation condition and the health state; wherein the set operating parameters include, but are not limited to, engine speed, engine thrust value, fuel flow, and engine exhaust temperature margin.

As shown in fig. 1 and 2, the controller 3 is electrically connected to the condensing part 12, the stirring part 15, the parameter collecting part 13, the sample gas collecting part 14, and the tail gas generating device in the tail gas analysis system through the signal link 6, and controls the corresponding parts based on the corresponding control instructions.

The controller obtains the corresponding set operation parameters of the aero-engine and the health state of the aero-engine, determines the operation condition of the aero-engine based on the set operation parameters, analyzes the emission characteristics of the aero-engine under different operation conditions and different health states based on the operation condition and the health state, and realizes the multidimensional analysis of the tail gas emitted by the aero-engine.

Example 2

The embodiment provides a tail gas analysis method, which is implemented by adopting the tail gas analysis system in embodiment 1; fig. 6 is a schematic flow chart of a first process of an exhaust gas analysis method according to the present embodiment, where the exhaust gas analysis method includes:

s101, obtaining tail gas discharged by a tail gas generating device.

The exhaust gas inputted from the exhaust gas generating device via the air inlet of the exhaust gas collecting chamber is obtained by the exhaust gas collecting device in the foregoing embodiment 1.

S102, cooling the tail gas by adopting a condensing part, and detecting the temperature of the cooled tail gas.

S103, judging whether the temperature of the tail gas accords with a preset temperature range.

If yes, S104 is executed.

S104, detecting the actual distribution uniformity of pollutants in the tail gas.

And S105, when the actual distribution uniformity accords with the preset distribution uniformity range, collecting tail gas of which the actual distribution uniformity accords with the preset distribution uniformity range as a sample gas to be analyzed.

S106, analyzing and obtaining emission characteristics of pollutants in the tail gas based on the sample gas to be analyzed.

According to the tail gas analysis method, when the actual distribution uniformity of pollutants in the tail gas accords with the preset distribution uniformity range, the tail gas with the actual distribution uniformity in accordance with the preset distribution uniformity range is collected to be used as the sample gas to be analyzed, so that the collected sample gas to be analyzed is more representative; the method realizes the online test and the real-time test of the emission characteristics of the gaseous and particulate pollutants in the tail gas, reduces the loss of the pollutants in the tail gas in the sampling process, and improves the test precision and the accuracy of the emission characteristics of the pollutants in the tail gas.

In an alternative embodiment, fig. 7 is a schematic flow chart of a second process of the exhaust gas analysis method provided in this embodiment, when the condensation component includes a condensation net and a condenser, if it is determined that the temperature of the exhaust gas does not conform to the preset temperature range, the exhaust gas analysis method further includes:

and S107, sending a first adjusting instruction to the condenser, and controlling the condenser to adjust the temperature of the condensing net based on the first adjusting instruction so as to enable the temperature of the tail gas passing through the condensing net to accord with a preset temperature range.

By controlling the condenser, the temperature of the tail gas passing through the condensing net is adjusted, so that the temperature of the tail gas passing through the condensing net accords with a preset temperature range.

In an alternative embodiment, fig. 8 is a schematic flow chart of a third flow chart of the exhaust gas analysis method provided in the present embodiment, when the stirring component includes a fan assembly and a motor assembly, the step S104 specifically includes:

s1041, judging whether the actual distribution uniformity of pollutants in the tail gas accords with a preset distribution uniformity range.

If not, S1042 is executed, and if yes, S1051 is executed.

S1042, sending a second adjusting instruction to the motor assembly, so that the motor assembly adjusts the rotating speed of the fan assembly based on the second adjusting instruction, and the actual distribution uniformity of pollutants in the tail gas is adjusted to meet the preset distribution uniformity range.

S1051, collecting tail gas with actual distribution uniformity conforming to a preset distribution uniformity range as sample gas to be analyzed.

Wherein S1051 is a specific step of S105.

Through the control to motor element, realized stirring the tail gas of collecting the intracavity through fan assembly, fan assembly's rotational speed can be adjusted, realization tail gas that can be quick evenly distributes in the tail gas collection intracavity, adjusts the actual distribution degree of consistency of pollutant in the tail gas and accords with the distribution degree of consistency scope of predetermineeing.

In an alternative embodiment, fig. 9 is a schematic diagram of a fourth flow chart of an exhaust gas analysis method provided in this embodiment, where the stirring component includes a first bracket, the exhaust gas analysis method further includes:

S201, acquiring a target interval distance between a fan assembly and a condensing net;

s202, judging whether the current interval distance between the fan assembly and the condensing net accords with the target interval distance.

If not, S203 is performed.

And S203, a third adjusting instruction is sent to the motor assembly, so that the motor assembly drives the first bracket to move based on the third adjusting instruction, and the current interval distance is adjusted to meet the target interval distance.

In an alternative embodiment, fig. 10 is a schematic diagram of a fifth flow chart of the exhaust gas analysis method provided in the present embodiment, when the condensation component further includes a second bracket and a driving component, and the current separation distance between the fan component and the condensation net does not meet the target separation distance, the step S202 further includes:

S204, a fourth adjusting instruction is sent to the driving assembly, so that the driving assembly drives the second bracket to move based on the fourth adjusting instruction, and the current spacing distance is adjusted to meet the target spacing distance.

In an alternative embodiment, when the parameter collection component includes the first sensor and the sample gas collection component includes the solenoid valve and the sample gas collection line, the step S105 specifically includes: when the actual distribution uniformity of pollutants in the tail gas accords with a preset distribution uniformity range, generating a fifth control instruction based on the actual distribution uniformity of the pollutants in the tail gas, and sending the fifth control instruction to the electromagnetic valve, so that the electromagnetic valve controls the sample gas collecting pipeline to be conducted based on the fifth control instruction to collect the sample gas to be analyzed.

In an alternative embodiment, when the exhaust gas generating device comprises an aeroengine, the exhaust gas analysis method comprises:

s301, acquiring emission characteristics of the aeroengine under set operation parameters and the health state of the aeroengine.

Wherein the set operating parameters include, but are not limited to, engine speed, engine thrust value, fuel flow, and engine exhaust temperature margin.

S302, determining the operation condition of the aero-engine based on the set operation parameters.

S303, analyzing emission characteristics of the aeroengine under different operation conditions and different health states based on the operation conditions and the health states.

The method of analysis of the aeroengine exhaust is described in detail below.

When the exhaust gas analysis system is installed, the controller is started to operate the aero-engine to a slow vehicle speed, and the slow vehicle typical thrust set value 7%F specified by ICAO (International Civil Aviation Organization ) is referred to as the value ₀₀ ，F ₀₀ For the full thrust value of the engine, the condenser is adjusted to reduce the temperature of the exhaust gas to a preset temperature range, for example, the preset temperature range is 120 ℃ to 100 ℃, so as to reduce the temperature impact on the components or assemblies in the exhaust gas collecting cavity, cool and condense the exhaust gas in the cavity, and simulate the physicochemical process of entering the atmosphere. After the engine runs stably and the pollutants are filled in the cavity (generally, after the engine runs for more than ten minutes at a slow vehicle rotating speed, the pollutants are filled in the cavity), testing the actual distribution uniformity of the pollutants in the tail gas of the cross section of the cavity in front of the first sampling probe by utilizing a plurality of first sampling probes which are arranged in the tail gas collecting cavity and correspond to the first sensor, and when the actual distribution uniformity meets the preset distribution uniformity range, for example, the current pollutant concentration acquired by each sampling probe is relative to the current pollutant concentration acquired by each sampling probe The standard deviation value is less than 10%, so that the sample gas to be detected can be collected. If the requirements are not met, the motor assembly can be controlled by the controller to increase or decrease the motor speed for adjusting the fan assembly speed.

And regulating the rotating speed or the thrust value of the engine in the range from the slow vehicle to the full thrust, and receiving and recording the emission characteristics of the real-time pollutants from the tail gas testing device under each rotating speed or thrust value by the controller. And (3) combining parameters such as EGTM (engine exhaust temperature margin), fuel flow and the like to obtain different operation conditions of the engine, and combining the health state of the engine and the emission characteristics of corresponding pollutants to carry out differential analysis.

The operation condition of the aero-engine is determined according to the corresponding set operation parameters of the aero-engine, the emission characteristics of the aero-engine under different operation conditions and different health states are analyzed according to the operation condition and the health state of the aero-engine, and the multi-dimensional analysis of tail gas emitted by the aero-engine is realized.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.

Claims

1. The tail gas analysis system is characterized by comprising a tail gas collecting device and a tail gas testing device;

2. The exhaust gas analysis system of claim 1, further comprising a controller, the exhaust gas collection device further comprising an agitation member;

the controller is electrically connected with the stirring component;

3. The exhaust gas analysis system of claim 2, wherein the condensing component comprises a condensing screen and a condenser;

the condensation net is arranged in the tail gas collecting cavity;

4. The exhaust gas analysis system according to claim 3, wherein the condensing means comprises a plurality of condensing nets spaced apart in sequence and arranged in parallel along a cavity direction of the exhaust gas collecting chamber.

5. The exhaust gas analysis system of claim 3, wherein the agitation member comprises a fan assembly and a motor assembly;

the fan assembly is arranged in the tail gas collecting cavity;

6. The exhaust gas analysis system of claim 5, wherein the fan assembly comprises a first fan and a second fan spaced apart in sequence and disposed in parallel along a cavity direction of the exhaust gas collection cavity;

The blade size of the first fan is larger than that of the second fan;

7. The exhaust gas analysis system according to claim 5, wherein the fan assembly comprises a third fan comprising a first number of blades and a second number of blades arranged in parallel in sequence along the cavity direction of the exhaust gas collection chamber;

the motor assembly includes a third motor;

the third motor is used for driving the third fan to rotate.

8. The exhaust gas analysis system of claim 5, wherein the exhaust gas collection device further comprises a baffle;

9. The exhaust gas analysis system of claim 5, wherein the agitation member further comprises a first support;

10. The exhaust gas analysis system of claim 2, wherein the parameter collection component comprises a first sensor;

11. The exhaust gas analysis system of claim 2, wherein the parameter collection component comprises a second sensor that collects a corresponding environmental parameter via a plurality of second sampling probes disposed within the exhaust gas collection cavity and sends the environmental parameter to the controller;

the tail gas analysis system further comprises a display device;

12. The exhaust gas analysis system of claim 10, wherein the exhaust gas testing device comprises a sample gas analysis component;

and/or, the tail gas testing device further comprises a flowmeter;

13. The exhaust gas analysis system of claim 1, further comprising a filter purification device;

and/or, the tail gas analysis system further comprises a fan;

14. The exhaust gas analysis system of claim 2, wherein the exhaust gas analysis system is disposed on a liftable mounting frame;

and/or the exhaust gas generating device comprises an aero-engine;

15. A method of analyzing exhaust gas, characterized in that the method of analyzing exhaust gas is implemented using the exhaust gas analysis system according to any one of claims 1 to 14;

the tail gas analysis method comprises the following steps:

obtaining tail gas discharged by a tail gas generating device;

16. The exhaust gas analysis method according to claim 15, wherein when the condensing means includes a condensing net and a condenser, the exhaust gas analysis method further comprises:

17. The exhaust gas analysis method according to claim 16, wherein when the agitation means comprises a fan assembly and a motor assembly, the step of detecting an actual uniformity of distribution of the pollutants in the exhaust gas comprises:

18. The exhaust gas analysis method according to claim 17, wherein when the stirring member includes a first bracket, the exhaust gas analysis method further comprises:

19. The method according to claim 15, wherein when the parameter collection unit includes a first sensor and the sample gas collection unit includes a solenoid valve and a sample gas collection line, the step of collecting, as the sample gas to be analyzed, the tail gas whose actual distribution uniformity of the contaminants in the tail gas conforms to a preset distribution uniformity range specifically includes:

20. The exhaust gas analysis method according to any one of claims 15 to 19, characterized in that when the exhaust gas generating device comprises an aeroengine, the exhaust gas analysis method comprises:

and analyzing the emission characteristics of the aeroengine under different operation conditions and different health states based on the operation conditions and the health states.