A nozzle testing and cleaning system and method

Abstract

The present invention relates to the technical field of combustion equipment, and specifically to a nozzle test and cleaning system and method, including an air intake system, a monitoring system and a test chamber; the nozzle to be treated is cleaned through a cleaning mode, the pressure difference between the new nozzle, the nozzle to be treated and the nozzle after treatment is detected through a test mode, and the cleaning effect is evaluated according to a relevant formula. The present invention constructs a nozzle test and cleaning system, which uses high-temperature air to clean the nozzle when the unit is cold, and can effectively remove the solidified coke on the fuel gas pipeline inside the nozzle, oxidize it into gaseous oxides and discharge it with the high-temperature air. The cleaning method does not require destructive treatment of the nozzle, and has the characteristics of fast cleaning speed and high safety and reliability; and it can quantitatively judge the cleaning effect of the nozzle, which is significantly more advanced than various existing methods, and can achieve the reuse of blocked nozzles, save resources, reduce cost investment, and has high economic value.

Description

Technical Field

[0001] The invention relates to the technical field of combustion equipment, and in particular to a burner testing and cleaning system and method. Background Art

[0002] A gas turbine is an internal combustion power machine that uses a continuously flowing gas as a working fluid to drive the impeller to rotate at high speed, converting the energy of the fuel into useful work. Its working process is to continuously inhale air from the atmosphere and compress it and send it into the combustion chamber to mix with the injected fuel and burn it into high-temperature combustion gas, which then flows into the gas turbine to expand and do work, driving the turbine impeller to rotate and output mechanical work to the outside. Due to its small size, light weight, fast start-up, and ability to use a variety of fuels, it is not only widely used in power plants, but is also widely used in many fields such as transportation, metallurgy, and chemical industry.

[0003] The combustion chamber of the entire gas turbine has a high temperature and is subject to thermal shock caused by drastic temperature changes when the gas turbine is started and stopped, so problems are more likely to occur. The most important part of the combustion chamber is the burner. The most common problem is corrosion and scaling, which affects the stable operation of the gas turbine. There are some technologies for cleaning burners, such as the burner cleaning devices proposed in patents CN219112295U and CN115770738A, which use a rotating mechanical mechanism to scrape and clean the scale. Patent CN112577060B proposes a cleaning system and a cleaning method for burners, which clean the scale by pressure blowing and mechanical vibration. However, from the application point of view, the purpose of treatment is concentrated on the burner, and the cleaning of the burner is not mentioned. Other public technologies such as patent CN214022396U also propose a carbon deposit cleaning machine for the burner of a gas engine, which uses a vacuum suction method to extract the deposits therein, but there are technical limitations, and the unit needs to be in a hot environment to be carried out. However, with the further improvement of safety requirements, the possibility of carrying out corresponding work in the hot state of the unit is getting lower and lower. At the same time, this method cannot completely complete the cleaning of the burner, and it is also impossible to quantitatively evaluate the degree of cleaning. Other methods such as chemical solvent cleaning and ultrasonic cleaning are not ideal. Therefore, there is an urgent need for a method that can efficiently complete nozzle cleaning and quantitatively evaluate the cleaning effect. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a burner nozzle testing and cleaning system and method, which can effectively remove the solidified coke on the fuel gas pipeline inside the burner nozzle, realize the reuse of the blocked burner nozzle, save resources, reduce cost investment, and have high economic value.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a nozzle testing and cleaning system and method, comprising an air intake system, a monitoring system, and a test cabin installed between the air intake system and the monitoring system;

[0006] The air intake system comprises an air intake pipeline, an air intake control valve, an air intake heater, an air intake flow meter and an air intake pressure gauge which are arranged in sequence;

[0007] The monitoring system includes a discharge pipeline, a discharge control valve, a discharge analyzer, a discharge flow meter, a discharge pressure gauge and a discharge thermometer which are arranged in sequence;

[0008] The test chamber comprises a test chamber body which is respectively connected with an air inlet pipeline and an exhaust pipeline, and a test chamber pressure gauge and a test chamber thermometer are installed on the test chamber body.

[0009] Preferably, the exhaust thermometer and the air intake heater form a loop control, and an over-temperature protection is provided.

[0010] Preferably, the test chamber body is provided with a hand hole for taking out and placing the firing nozzle.

[0011] Preferably, the air intake system, monitoring system and test chamber are integrated on the same skid.

[0012] Preferably, the air inlet pipeline is externally connected to a gas source, and the gas source can be pure oxygen or air without carbon dioxide; the exhaust pipeline is externally connected to a safe place for exhaust.

[0013] The present invention also provides a test cleaning method for a test cleaning system, including a test mode and a cleaning mode. The cleaning mode is used to clean the burner to be treated. The pressure difference between the new burner, the burner to be treated and the burner after treatment is detected by the test mode and the cleaning mode. The cleaning effect is evaluated according to the following formula:

[0014]

[0015] In the formula, For cleaning effect, %; Test the pressure difference for the new burner, MPa; The test pressure difference of the burner to be treated, MPa; To test the pressure difference of the treated burner, MPa.

[0016] Preferably, the test mode is as follows: the burner is installed in the test cabin body, the air intake pipe, the burner and the exhaust pipe form a passage, and after sealing, the air intake control valve is slowly opened to gradually build up the system pressure, and after the system pressure stabilizes, the exhaust control valve is slowly opened to control the air intake flow rate to remain unchanged, and the air intake pressure and the exhaust pressure are monitored, and the patency of the burner is judged according to the pressure difference between the air intake pressure and the exhaust pressure.

[0017] Preferably, the cleaning mode is as follows: the burner to be treated is installed in the test chamber body, the air intake pipe, the burner and the exhaust pipe form a passage, and after sealing, the air intake control valve is slowly opened to gradually build up the system pressure, and the exhaust control valve is slowly opened after the system pressure stabilizes to control the air intake flow rate to remain unchanged; then the air intake heater is turned on to heat up, and while the exhaust temperature rises to the specified temperature and is kept warm, the emission analyzer and the pressure difference between the intake pressure and the exhaust pressure are monitored, and when the emission analyzer reading returns to zero and the pressure difference no longer changes, the data is recorded, and the temperature of the air intake heater is gradually lowered to room temperature, the test chamber body is opened, and the treated burner is taken out.

[0018] Preferably, the intake control valve is gradually opened at a rate of 1% per second; the system pressure is 0.55 MPa; the exhaust control valve is gradually opened at a rate of 1% per second; the intake flow rate is 50 Nm 3 / h; the heating rate of the air intake heater is 12℃ / min; the specified temperature of the discharge is 550℃; the air intake heater is cooled to 120℃ at a rate of 12℃ / min and then stopped, and the air intake purge is continued until the system temperature drops to room temperature.

[0019] The present invention provides a nozzle testing and cleaning system and method, which have the following beneficial effects compared with the prior art:

[0020] The present invention constructs a burner nozzle testing and cleaning system, which uses high-temperature gas to clean the burner nozzle when the unit is cold, and can effectively remove solidified coke on the fuel gas pipeline inside the burner nozzle, oxidize it into gaseous oxides and discharge it together with the high-temperature air. The cleaning method does not require destructive treatment of the burner nozzle, and has the characteristics of fast cleaning speed, high safety and reliability. Moreover, by comparing the before and after data, the cleaning effect of the burner nozzle can be effectively and quantitatively judged. Compared with various existing methods, it has obvious advantages, can realize the reuse of blocked burners, save resources, reduce cost investment, and has high economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0022] Figure 1 It is a schematic diagram of the burner nozzle testing and cleaning system of the present invention.

[0023] In the figure: 1-intake system, 2-monitoring system, 3-test chamber;

[0024] 11-intake pipeline, 12-intake control valve, 13-intake heater, 14-intake flow meter, 15-intake pressure gauge;

[0025] 21-discharge pipeline, 22-discharge control valve, 23-discharge analyzer, 24-discharge flow meter, 25-discharge pressure gauge, 26-discharge thermometer;

[0026] 31-test chamber body, 32-test chamber pressure gauge, 33-test chamber thermometer. DETAILED DESCRIPTION

[0027] The following examples are used to explain the implementation methods of the present application in detail, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0028] Example 1

[0029] A burner nozzle test and cleaning system comprises an air intake system 1, a monitoring system 2 and a test chamber 3 installed between the air intake system 1 and the monitoring system 2; the air intake system 1, the monitoring system 2 and the test chamber 3 are integrated on the same skid, and the burner nozzle test and cleaning system can be automatically moved, which is convenient to use.

[0030] The above-mentioned intake system 1 includes an intake pipeline 11, an intake control valve 12, an intake heater 13, an intake flow meter 14 and an intake pressure gauge 15 arranged in sequence; the intake pipeline 11 is externally connected to a gas source, and the gas source can be pure oxygen or air without carbon dioxide. The above-mentioned monitoring system 2 includes an exhaust pipeline 21, an exhaust control valve 22, an exhaust analyzer 23, an exhaust flow meter 24, an exhaust pressure gauge 25 and an exhaust thermometer 26 arranged in sequence; the exhaust pipeline 21 is externally connected to a safe place for exhaust; the exhaust analyzer 23 is used to detect the oxide content (carbon dioxide content), control the exhaust thermometer 26 and the intake heater 13 to form a loop control, and set an over-temperature protection to prevent the temperature of the intake heater 13 from being too high. The above-mentioned test chamber 3 includes a test chamber body 31 connected to the intake pipeline 11 and the exhaust pipeline 21 respectively, and a test chamber pressure gauge 32 and a test chamber thermometer 33 are installed on the test chamber body 31. The test chamber body 31 is provided with a hand hole for taking out and releasing the ignition nozzle.

[0031] When testing and cleaning the burner, proceed as follows: install the burner to be treated in the test chamber body 31, and after the hand hole of the test chamber body 31 is sealed, slowly open the air intake control valve 12 to introduce the gas source, gradually build up the system pressure, and slowly open the discharge control valve 22 after the system pressure stabilizes to control the air intake flow rate to remain unchanged; then open the air intake heater 13 to heat the gas source, and monitor the emission analyzer 23 and the pressure difference between the intake pressure and the discharge pressure while the discharge temperature rises to the specified temperature and is kept warm. After the reading of the emission analyzer 23 first rises and then falls and returns to zero, and the pressure difference no longer changes, record the data, and gradually lower the temperature of the air intake heater to room temperature, open the test chamber body 31, and take out the treated burner.

[0032] Example 2

[0033] A method for testing and cleaning a nozzle test and cleaning system, using the nozzle test and cleaning system in Example 1, specifying a gas source as pure oxygen, comprising:

[0034] Test Mode

[0035] Install the new burner in the test chamber body 31. The air intake pipe 11, the new burner and the exhaust pipe 21 form a passage. After sealing, slowly open the air intake control valve 12 to gradually build up the system pressure. After the system pressure stabilizes at 0.55MPa, slowly open the exhaust control valve 22 to finally control the air intake flow rate to 50Nm 3 / h, the monitored intake pressure is 0.55MPa and the discharge pressure is 0.53MPa.

[0036] Install the burner to be cleaned in the test chamber body 31. The air intake pipe 11, the burner to be cleaned and the exhaust pipe 21 form a passage. After sealing, slowly open the air intake control valve 12 to gradually build up the system pressure. After the system pressure stabilizes at 0.55MPa, slowly open the exhaust control valve 22 to finally control the air intake flow rate to 50Nm 3 / h, the monitored intake pressure is 0.55MPa and the discharge pressure is 0.38MPa.

[0037] Cleaning Mode

[0038] The burner to be treated is installed in the test chamber body 31. The air intake pipe 11, the burner to be treated and the discharge pipe 21 form a passage. After sealing, slowly open the air intake control valve 12 at a rate of 1% per second to gradually build up a system pressure of 0.55MPa. After the pressure stabilizes, slowly open the discharge control valve 22 at a rate of 1% per second to finally control the system air intake flow rate at 50Nm 3 / h, turn on the intake heater 13 and set the exhaust temperature, control the system heating rate to 12℃ / min, gradually and steadily increase the exhaust temperature to 550℃, monitor the carbon dioxide in the exhaust pipe 21 at 380℃ during the heating process, and gradually increase with the heating process, reaching a peak of 18mg / kg when the temperature reaches 520℃, and the carbon dioxide content gradually decreases after the exhaust temperature is maintained at 550℃ for 18min, and the carbon dioxide content is 0mg / kg after the exhaust temperature is maintained at 550℃ for 26min, and the exhaust pressure is 0.51MPa at this time, and after continuing to maintain it for 4min, the exhaust pressure does not change, and starts to cool down at a cooling rate of 12℃ / min, and stops after cooling to 120℃, and continues to maintain the intake purge until the system temperature drops to room temperature, and the treated burner is taken out to complete the cleaning. The specific results are shown in the following table.

[0039] Table 1 Implementation group nozzle test cleaning data

[0040] The cleaning effect was evaluated according to the following formula:

[0041]

[0042] In the formula, For cleaning effect, %; Test the pressure difference for the new burner, MPa; The test pressure difference of the burner to be treated, MPa; To test the pressure difference of the treated burner, MPa.

[0043] Calculation shows that the cleaning effect is 86.7%, that is, the internal patency of the burner after treatment can reach 86.7% of that of a new burner.

[0044] Comparative Example 1

[0045] Take the burners to be treated and the new burners, and test the burners using the test mode in Example 2 to obtain relevant data on the intake pressure, exhaust pressure and pressure difference. Then clean the burners to be treated using a combination of chemical solvent cleaning and ultrasonic cleaning, and test the treated burners using the test mode in Example 2 to obtain relevant data. The specific results are shown in the following table.

[0046] Table 2 Comparison group nozzle test cleaning data

[0047] According to the formula in Example 2, it can be calculated that the cleaning effect is 20.0%, that is, the internal patency of the burner nozzle after treatment can reach 20.0% of that of a new burner nozzle.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for testing and cleaning a nozzle test and cleaning system, characterized in that: A nozzle test cleaning system is used, comprising an air intake system (1), a monitoring system (2), and a test chamber (3) installed between the air intake system (1) and the monitoring system (2); The air intake system (1) comprises an air intake pipeline (11), an air intake control valve (12), an air intake heater (13), an air intake flow meter (14), and an air intake pressure gauge (15) which are arranged in sequence; The monitoring system (2) comprises a discharge pipeline (21), a discharge control valve (22), a discharge analyzer (23), a discharge flow meter (24), a discharge pressure gauge (25), and a discharge thermometer (26) which are arranged in sequence; The test chamber (3) comprises a test chamber body (31) which is respectively connected to the air intake pipeline (11) and the exhaust pipeline (21); a test chamber pressure gauge (32) and a test chamber thermometer (33) are installed on the test chamber body (31); The test cleaning method includes a test mode and a cleaning mode. The cleaning mode is used to clean the burner to be treated. The pressure difference between the new burner, the burner to be treated and the burner after treatment is detected by the test mode and the cleaning mode. The cleaning effect is evaluated according to the following formula: In the formula, For cleaning effect, ; Test the pressure difference for the new burner, MPa; The test pressure difference of the burner to be treated, MPa; Test pressure difference of the post-treatment burner, MPa; The test mode is as follows: the burner is installed in the test chamber body (31), the air intake pipeline (11), the burner and the exhaust pipeline (21) form a passage, and after being sealed, the air intake control valve (12) is slowly opened to gradually build up the system pressure, and after the system pressure is stabilized, the exhaust control valve (22) is slowly opened to control the air intake flow rate to remain unchanged, and the air intake pressure and the exhaust pressure are monitored, and the patency of the burner is judged according to the pressure difference between the air intake pressure and the exhaust pressure; The cleaning mode is as follows: the burner to be treated is installed in the test chamber body (31), the air intake pipeline (11), the burner and the exhaust pipeline (21) form a passage, and after being sealed, the air intake control valve (12) is slowly opened to gradually build up the system pressure, and after the system pressure is stabilized, the exhaust control valve (22) is slowly opened to control the air intake flow rate to remain unchanged; then the air intake heater (13) is turned on to increase the temperature, and when the exhaust temperature rises to a specified temperature and is kept warm, the exhaust analyzer (23) and the pressure difference between the exhaust pressure and the exhaust pressure are monitored, and when the reading of the exhaust analyzer (23) returns to zero and the pressure difference no longer changes, the data is recorded, and the temperature of the air intake heater (13) is gradually lowered to room temperature, the test chamber body (31) is opened, and the burner after treatment is obtained by taking it out.

2. The test and cleaning method of the nozzle test and cleaning system according to claim 1, characterized in that: The discharge thermometer (26) and the air intake heater (13) form a loop control, and an over-temperature protection is provided.

3. The test and cleaning method of the nozzle test and cleaning system according to claim 1, characterized in that: The test chamber body (31) is provided with a hand hole for taking out and placing the firing nozzle.

4. The test and cleaning method of the nozzle test and cleaning system according to claim 1, characterized in that: The air intake system (1), the monitoring system (2) and the test chamber (3) are integrated on the same skid.

5. The test and cleaning method of the nozzle test and cleaning system according to claim 1, characterized in that: The air intake pipeline (11) is externally connected to an air source; the exhaust pipeline (21) is externally connected to a safe place for exhaust.

6. The method for testing and cleaning a nozzle testing and cleaning system according to claim 1, characterized in that: The intake control valve opens gradually at a rate of 1% per second; the system pressure is 0.55 MPa; the exhaust control valve opens gradually at a rate of 1% per second; the intake flow rate is 50 Nm 3 / h; the heating rate of the air intake heater (13) is 12°C / min; the specified temperature of the discharge is 550°C; the air intake heater (13) is cooled to 120°C at a rate of 12°C / min and then stopped, and the air intake purge is continued until the system temperature drops to room temperature.

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