Movable boiler energy efficiency and emission performance test platform

Abstract

The present invention discloses a movable boiler energy efficiency and emission performance test platform, including a truck body, on which a recirculation fan, a blower, a burner, a hot water boiler body, a water treatment device, a water tank, a circulating water pump, a combined economizer, an air preheater, a water supply pump and a cooling tower are respectively arranged, one end of the recirculation fan is connected to the burner, one end of the hot water boiler body is connected to the burner, one end of the blower is connected to the air preheater, the other end of the hot water boiler body is connected to the combined economizer through a pipeline, the top of the combined economizer is connected to the water supply pump through a pipeline, and a valve is arranged on the pipeline. In the present invention, the water system between the hot water boiler and the cooling tower operates in a closed loop, and the medium water loss during the operation is small; the flue gas recirculation fan is controlled by a variable frequency method, and the change of different air volumes between the flue gas recirculation rate of 0-30% can be realized; the boiler energy efficiency and environmental protection test can be carried out in different altitudes.

Description

Technical Field

[0001] The invention relates to the technical field of boiler energy efficiency and air pollutant emission control, and in particular to a movable boiler energy efficiency emission performance experimental platform. Background Art

[0002] A boiler is an energy conversion device. The energy input into the boiler includes chemical energy and electrical energy in the fuel, and the boiler outputs steam, high-temperature water or organic heat carrier with a certain amount of thermal energy.

[0003] The original meaning of pot refers to a container for holding water heated on fire, and furnace refers to a place where fuel is burned. A boiler consists of two parts: a pot and a furnace. The hot water or steam produced in a boiler can directly provide the required heat energy for industrial production and people's lives, or it can be converted into mechanical energy through a steam power device, and then converted into electrical energy through a generator. A boiler that provides hot water is called a hot water boiler, which is mainly used for life and has a small number of applications in industrial production. A boiler that produces steam is called a steam boiler, which is mostly used in thermal power plants, ships, locomotives, and industrial and mining enterprises.

[0004] The plateau area has the environmental characteristics of high altitude, low air pressure and thin air. With every increase of 1,000 meters in altitude, the atmospheric pressure drops by about 10 kPa, the air density drops by about 0.1 kg per cubic meter, and the oxygen content drops by about 0.3 kg per cubic meter. These factors may cause problems such as incomplete fuel combustion, increased flue gas flow resistance, reduced thermal efficiency, and insufficient output when the boiler is operated in the plateau area. For this reason, we propose a movable boiler energy efficiency and emission performance experimental platform. Summary of the invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes a movable boiler energy efficiency and emission performance experimental platform to solve the problems raised in the background technology.

[0006] The present invention provides the following technical solutions:

[0007] A movable boiler energy efficiency and emission performance experimental platform includes a truck body, on which a recirculation fan, a blower, a burner, a hot water boiler body, water treatment equipment, a water tank, a circulating water pump, a combined economizer, an air preheater, a make-up water pump and a cooling tower are respectively arranged. One end of the recirculation fan is connected to the burner, one end of the hot water boiler body is connected to the burner, one end of the blower is connected to the air preheater, the other end of the hot water boiler body is connected to the combined economizer through a pipeline, the top of the combined economizer is connected to the make-up water pump through a pipeline, and a valve is provided on the pipeline, the other end of the make-up water pump is connected to the water tank, the top of the combined economizer is connected to the circulating water pump through a pipeline, and a valve is provided on the pipeline, and the other end of the circulating water pump is connected to the cooling tower.

[0008] Preferably, the other end of the recirculation fan is connected to a connecting pipe, the other end of the connecting pipe is connected to the flue on the combined economizer and the flues on its front and rear sides, and a five-stage flue gas valve is provided on the connecting pipe, the pipeline between the hot water boiler body and the combined economizer is connected to the connecting pipe, and a first-stage flue gas valve is provided on the pipeline, the end of the combined economizer close to the connecting pipe is connected to the connecting pipe through a pipeline, and the number of pipelines is three, and the pipelines are respectively provided with a second-stage smoke gas valve, a third-stage smoke gas valve and a fourth-stage smoke gas valve.

[0009] Preferably, the method of use comprises the following steps:

[0010] (1) Fill the system with water until it is full, fill the water tank with water until it is full, drive the truck to a testable location at an altitude of 1,500 meters, and select a liquefied natural gas vehicle that matches the test bench;

[0011] (2) Before the experiment, check that the water inlet valve and outlet valve of the hot water boiler are fully open, turn on the water supply pump to supply water until the system is full of water, and then turn off the water supply pump after the gas in the system pipeline is emptied;

[0012] (3) Turn on the circulating water pump, and the circulating water pump runs normally without abnormal noise;

[0013] (4) Turn on the cold water system in the cooling tower and confirm that the cold water system is operating normally;

[0014] (5) Turn on the hot water boiler, set the burner load at 30%, and record the gas pressure, gas temperature and gas flow rate at this time;

[0015] (6) After the hot water boiler has been running stably for 1 hour, external equipment is used to measure the circulating water flow rate, inlet water temperature, outlet water temperature, exhaust gas temperature and flue gas composition related data of the hot water boiler;

[0016] (7) Open the first-level flue gas valve and close the second-level, third-level, fourth-level and fifth-level flue gas valves, start the recirculation fan, and observe the changes in the outlet water temperature of the hot water boiler, the exhaust gas temperature, and the oxygen, carbon monoxide and nitrogen oxides in the flue gas components. When ensuring that there is no significant change in the oxygen content and carbon monoxide in the flue gas and that there is no significant vibration during boiler operation, the nitrogen oxides drop to 80 mg / m 3 When recording the hot water boiler body circulating water flow, water inlet temperature, water outlet temperature, exhaust gas temperature and flue gas composition related data;

[0017] (8) Continue to increase the frequency of the recirculation fan and observe the changes in the outlet water temperature of the hot water boiler, the exhaust gas temperature, and the oxygen, carbon monoxide, and nitrogen oxides in the flue gas. When ensuring that there is no significant change in the oxygen content and carbon monoxide in the flue gas and that there is no significant vibration during boiler operation, the nitrogen oxides drop to 50 mg / m 3 , 30mg / m 3 When recording the smoke components, the second-level smoke valve is opened in sequence, and the other smoke valves are closed; the third-level smoke valve is opened, and the other smoke valves are closed; the fourth-level smoke valve is opened, and the other smoke valves are closed; the fifth-level smoke valve is opened, and the other smoke valves are closed;

[0018] (9) Increase the burner load to 40%, 50%, 60%, 70%, 80%, 90%, 100%, record the gas pressure, gas temperature and gas flow at this time, and repeat the relevant contents of steps 6, 7, 8, and 9;

[0019] (10) Organize all the test data, and statistically analyze and study the relationship between boiler energy efficiency and air pollutant emissions at different altitudes under the premise of the same fuel consumption.

[0020] The present invention provides a movable boiler energy efficiency and emission performance test platform, and the beneficial effects are as follows:

[0021] 1. The water system between the hot water boiler and the cooling tower in the present invention operates in a closed loop, and the medium water loss during the operation is small.

[0022] 2. The flue gas recirculation fan of the present invention is controlled by frequency conversion, which can achieve different air volume changes between 0-30% of the flue gas recirculation rate.

[0023] 3. The present invention can be used to conduct boiler energy efficiency and environmental protection tests in areas with different altitudes. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention.

[0025] In the figure: 1. Burner; 2. Hot water boiler body; 3. Combined energy saver; 4. Blower; 5. Air preheater; 6. Water tank; 7. Make-up water pump; 8. Water treatment equipment; 9. Truck body; 10. Cooling tower; 11. Circulating water pump; 12. Five-stage flue gas valve; 13. Four-stage flue gas valve; 14. Three-stage flue gas valve; 15. Two-stage flue gas valve; 16. Connecting pipe; 17. One-stage flue gas valve; 18. Recirculation fan. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1 , the present invention provides a technical solution:

[0028] The movable boiler energy efficiency and emission performance experimental platform includes a truck body 9, on which are respectively provided a recirculation fan 18, a blower 4, a burner 1, a hot water boiler body 2, a water treatment device 8, a water tank 6, a circulating water pump 11, a combined economizer 3, an air preheater 5, a make-up water pump 7 and a cooling tower 10. One end of the recirculation fan 18 is connected to the burner 1, one end of the hot water boiler body 2 is connected to the burner 1, one end of the blower 4 is connected to the air preheater 5, the other end of the hot water boiler body 2 is connected to the combined economizer 3 through a pipeline, the top of the hot water boiler body 2 is connected to the make-up water pump 7 through a pipeline, and a valve is provided on the pipeline, the other end of the make-up water pump 7 is connected to the water tank 6, the top of the hot water boiler body 2 is connected to the circulating water pump 11 through a pipeline, and a valve is provided on the pipeline, and the other end of the circulating water pump 11 is connected to the cooling tower 10.

[0029] The method of use includes the following steps:

[0030] 1. Fill the system with water until it is full, fill the water tank 6 with water until it is full, drive the truck body 9 to a testable position at an altitude of 1,500 meters, and select the liquefied natural gas vehicle that matches the test bench;

[0031] 2. Before the experiment, check that the water inlet valve and outlet valve of the hot water boiler body 2 are fully open, turn on the water supply pump 7 to supply water until the system is full of water, and then close the water supply pump 7 after the gas in the system pipeline is emptied;

[0032] 3. Turn on the circulating water pump 11. The circulating water pump 11 runs normally without abnormal sound;

[0033] 4. Turn on the cold water system in cooling tower 10 and confirm that the cold water system is operating normally;

[0034] 5. Turn on the hot water boiler body 2, set the burner 1 load at 30%, and record the gas pressure, gas temperature and gas flow at this time;

[0035] 6. After the hot water boiler body 2 has been running stably for 1 hour, external equipment is used to measure the circulating water flow, water inlet temperature, water outlet temperature, exhaust gas temperature and flue gas component related data of the hot water boiler body 2;

[0036] 7. Open the first-level flue gas valve 17 and close the second-level flue gas valve 15, the third-level flue gas valve 14, the fourth-level flue gas valve 13 and the fifth-level flue gas valve 12, turn on the recirculation fan 18, and observe the changes in the outlet water temperature of the hot water boiler body 2, the exhaust gas temperature, and the oxygen, carbon monoxide and nitrogen oxides in the flue gas components. When ensuring that there is no significant change in the oxygen content and carbon monoxide in the flue gas and no obvious vibration during boiler operation, the nitrogen oxides drop to 80mg / m 3 When the hot water boiler body 2 is running, the circulating water flow, water inlet temperature, water outlet temperature, exhaust gas temperature and flue gas component related data are recorded;

[0037] 8. Continue to increase the frequency of the recirculation fan 18, observe the changes in the outlet water temperature of the hot water boiler body 2, the exhaust gas temperature, and the oxygen, carbon monoxide and nitrogen oxides in the flue gas components. When ensuring that there is no significant change in the oxygen content and carbon monoxide in the flue gas and no obvious vibration during boiler operation, the nitrogen oxides drop to 50mg / m 3 , 30mg / m 3 When recording the smoke components, the second-level smoke valve 15 is opened, the other smoke valves are closed, the third-level smoke valve 14 is opened, the other smoke valves are closed, the fourth-level smoke valve 13 is opened, the other smoke valves are closed, the fifth-level smoke valve 12 is opened, and the other smoke valves are closed;

[0038] 9. Increase the load of burner 1 to 40%, 50%, 60%, 70%, 80%, 90%, 100%, record the gas pressure, gas temperature and gas flow at this time, and repeat the relevant contents of steps 6, 7, 8, and 9;

[0039] 10. Organize all the test data, count and study the relationship between boiler energy efficiency and air pollutant emissions at different altitudes under the premise of the same fuel consumption

[0040] The natural gas generates high-temperature flue gas through the diffusion combustion mode, and the flue gas releases heat after heat exchange with the hot water boiler body 2 and the combined economizer 3 and is discharged.

[0041] The diffusion combustion mode is a combustion mode in which the gas and air are separately delivered into the combustion chamber, and the gas and the smoke in the air are diffused, mixed and burned. The test device is equipped with a blast-type diffusion burner, including a separate blower 4, a combustion head, a control system, and a recirculation fan 18.

[0042] The hot water boiler body 2 is arranged in a horizontal internal combustion manner, and there are fire viewing holes, temperature measuring point holes and pressure measuring point holes connected to the corrugated furnace on both sides of the boiler shell.

[0043] The mobile energy efficiency emission test platform adopts a DCS control system, the burner 1 is fully automatic proportional regulation control, and the recirculation fan 18 is frequency conversion control.

[0044] Embodiment 1:

[0045] 1. Fill the system with water until it is full, fill the water tank 6 with water until it is full, drive the test movable truck to the test location at an altitude of 2000 meters, where there is 380V power electricity, and select the liquefied natural gas vehicle that matches the test bench;

[0046] 2. After repeating the relevant contents of steps 2-4, adjust the natural gas consumption to the state of step 5. Without changing the frequency of burner 1 and blower 4, confirm the oxygen content and carbon monoxide content in the flue gas of hot water boiler body 2. If the data are basically consistent with the oxygen content and carbon monoxide content in the flue gas in step 5, repeat the relevant contents of steps 6, 7, and 8. If the oxygen content in the flue gas is significantly lower than that in step 5, and the carbon monoxide content in the flue gas is significantly higher than that in step 5, it is necessary to increase the frequency of blower 4 until the gas components in the flue gas are similar to those in step 5, and repeat steps 6, 7, and 8.

[0047] 3. Adjust the operating parameters of the hot water boiler body 2 according to the gas flow in step 9, and operate according to the steps in step 2 and record the relevant data.

[0048] Embodiment 2:

[0049] (1) The system is filled with water, the water tank 6 is filled with water, and the test movable truck is driven to a testable position (with 380V power supply locally) at an altitude of 2500 meters, 3000 meters, 3500 meters, 4000 meters, and 4500 meters (the altitude is determined according to the actual situation on site, and the change gradient is kept consistent as much as possible) (the liquefied natural gas vehicle matching the test bench is selected);

[0050] (2) Repeat the relevant steps of Example 1 and record the relevant quantities.

[0051] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for using a portable boiler energy efficiency and emission performance test platform, the test platform comprising a truck body (9), the truck body (9) being respectively provided with a recirculation fan (18), a blower (4), a burner (1), a hot water boiler body (2), a water treatment device (8), a water tank (6), a circulating water pump (11), a combined economizer (3), an air preheater (5), a water supply pump (7) and a cooling tower (10), one end of the recirculation fan (18) being connected to the burner (1), one end of the hot water boiler body (2) being connected to the burner (1), one end of the blower (4) being connected to the air preheater (5), the other end of the hot water boiler body (2) being connected to the combined economizer (3) through a pipeline, the top of the combined economizer (3) being connected to the water supply pump (7) through a pipeline, and a valve being provided on the pipeline, the other end of the water supply pump (7) being connected to the water tank (6) ), the top of the combined economizer (3) is connected to a circulating water pump (11) through a pipeline, and a valve is provided on the pipeline. The other end of the circulating water pump (11) is connected to a cooling tower (10). The other end of the recirculating fan (18) is connected to a connecting pipe (16). The other end of the connecting pipe (16) is connected to a flue on the combined economizer (3) and the flues on both sides thereof, and a five-stage flue gas valve (12) is provided on the connecting pipe (16). The pipeline between the hot water boiler body (2) and the combined economizer (3) is connected to the connecting pipe (16), and a first-stage flue gas valve (17) is provided on the pipeline. One end of the combined economizer (3) close to the connecting pipe (16) is connected to the connecting pipe (16) through a pipeline, and the number of pipelines is three. The pipelines are respectively provided with a second-stage flue gas valve (15), a third-stage flue gas valve (14) and a fourth-stage flue gas valve (13). The invention is characterized in that: The method of use comprises the following steps: (1) Fill the system with water until it is full, fill the water tank (6) with water until it is full, drive the truck body (9) to a testable position at an altitude of 1,500 meters, and select a liquefied natural gas vehicle that matches the test bench; (2) Before the experiment, check that the water inlet valve and the water outlet valve of the hot water boiler body (2) are fully open, and the water supply pump (7) is turned on to supply water until the system is full of water. After the gas in the system pipeline is emptied, the water supply pump (7) is turned off; (3) Turn on the circulating water pump (11). The circulating water pump (11) operates normally without abnormal noise. (4) Turn on the cold water system in the cooling tower (10) and confirm that the cold water system is operating normally; (5) Turn on the hot water boiler body (2), set the burner (1) load at 30%, and record the gas pressure, gas temperature and gas flow at this time; (6) After the hot water boiler body (2) has been running stably for 1 hour, external equipment is used to measure the circulating water flow rate, water inlet temperature, water outlet temperature, exhaust gas temperature and flue gas composition related data of the hot water boiler body (2); (7) Open the first flue gas valve (17) and close the second flue gas valve (15), third flue gas valve (14), fourth flue gas valve (13) and fifth flue gas valve (12), start the recirculation fan (18), and observe the changes in the outlet water temperature of the hot water boiler body (2), the exhaust gas temperature, and the oxygen, carbon monoxide and nitrogen oxides in the flue gas components. When ensuring that there is no significant change in the oxygen content and carbon monoxide in the flue gas and that there is no significant vibration during boiler operation, the nitrogen oxides drop to 80 mg / m 3 When recording the hot water boiler body (2), the circulating water flow, water inlet temperature, water outlet temperature, exhaust gas temperature and flue gas composition related data; (8) Continue to increase the frequency of the recirculation fan (18) and observe the changes in the outlet water temperature of the hot water boiler body (2), the exhaust gas temperature, and the oxygen, carbon monoxide, and nitrogen oxides in the flue gas components. When ensuring that there is no significant change in the oxygen content and carbon monoxide in the flue gas and that there is no significant vibration during boiler operation, the nitrogen oxides drop to 50 mg / m 3 , 30mg / m 3 When recording the smoke components, the circulating water flow rate, water inlet temperature, water outlet temperature, smoke exhaust temperature and smoke component-related data of the hot water boiler body (2) are recorded respectively. When recording the smoke components, the second-level smoke valve (15) is opened in sequence, and the other smoke valves are closed. The third-level smoke valve (14) is opened, and the other smoke valves are closed. The fourth-level smoke valve (13) is opened, and the other smoke valves are closed. The fifth-level smoke valve (12) is opened, and the other smoke valves are closed. (9) Increase the load of the hot water boiler body (2) and set it to 40%, 50%, 60%, 70%, 80%, 90%, 100%, record the gas pressure, gas temperature and gas flow at this time, and repeat the relevant contents of steps 6, 7, 8, and 9; (10) Organize all the test data, and statistically analyze and study the relationship between boiler energy efficiency and air pollutant emissions at different altitudes under the premise of the same fuel consumption.

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