High-efficiency multi-thread high-temperature flue gas corrosion simulation test device

Abstract

The utility model discloses a high-efficiency multi-thread high-temperature flue gas corrosion simulation test device which comprises a high-pressure gas source, a gas supply pipeline, a heating device and a tail gas treatment device, the high-pressure gas source comprises two groups of high-pressure gas cylinders filled with compressed gas, one group of high-pressure gas cylinders filled with corrosive gas and used for providing a gas environment in the furnace, and the other group of high-pressure gas cylinders filled with nitrogen and used for purging a gas path; the gas supply pipeline comprises a gas rotor flow meter, a quick opening and closing valve, a steel gas pipeline and a pressure reducing valve; the heating device is a horizontal tubular heating furnace, a plurality of parallel independent channels with the same size are arranged in the tubular heating furnace, and a quartz tube is mounted at each parallel independent channel; and the tail gas treatment device comprises two groups of gas washing bottles filled with NaOH solution and a plurality of communicating guide pipes. The problems that under the complex working condition, when the workload of a high-temperature flue gas corrosion test is large, a single-process corrosion test device is low in working efficiency, large in contrast test error and the like are solved.

Description

Technical Field

[0001] This utility model relates to the field of high-temperature flue gas corrosion testing technology for boiler heating surface metal materials, and in particular to a high-efficiency multi-threaded high-temperature flue gas corrosion simulation test device. Background Technology

[0002] High-temperature corrosion of heating surfaces is a common problem in biomass boilers and one of the main factors affecting the continuous and stable operation of biomass boilers, thus limiting the development of modern biomass power plants towards higher parameters.

[0003] There are many factors that cause high-temperature corrosion of the heating surfaces of biomass boilers. In addition to the significant influence of temperature, the complex composition of flue gas is also a major cause of metal corrosion of the heating surfaces. Therefore, the study of this type of corrosion mechanism is very complex.

[0004] To study the high-temperature corrosion mechanism of boiler heating surfaces under complex flue gas conditions, extensive experiments are often required to comprehensively consider the influence of various factors on the corrosion rate of the boiler heating surface metal materials. Furthermore, when developing lifetime prediction models based on the corrosion rate of metal materials, a large number of experiments are also necessary to accumulate as much corrosion data as possible, thereby improving the accuracy and universality of the constructed prediction model.

[0005] However, current laboratory-scale high-temperature flue gas corrosion testing equipment is relatively simple, mostly a single-process design of "gas cylinder supply + gas mixing device + tubular furnace heating." While it can simulate high-temperature corrosion tests on heated surfaces under different flue gas environments, its drawback is that it is unsuitable for large-scale testing and imposes too many limitations on experimental design. Especially when a large number of corrosion tests are required, such equipment faces two main problems: 1. Low work efficiency, with multiple tests leading to excessively long research cycles; 2. In studying complex operating conditions with multiple factors, control group tests for single-factor changes cannot be conducted simultaneously, resulting in increased comparison errors between different batches. Utility Model Content

[0006] To address the aforementioned technical problems, this invention presents a high-efficiency, multi-threaded high-temperature flue gas corrosion simulation test device. This solves the problems of low efficiency in single-process corrosion test devices and large errors in control tests when the workload of high-temperature flue gas corrosion testing is large under complex working conditions.

[0007] The present invention adopts the following technical solution:

[0008] A high-efficiency, multi-threaded high-temperature flue gas corrosion simulation test device includes a high-pressure gas source, a gas supply pipeline, a heating device, and an exhaust gas treatment device.

[0009] The high-pressure gas source consists of two high-pressure gas cylinders containing compressed gas. One set is a high-pressure gas cylinder containing corrosive gas used to provide the gas environment inside the furnace, and the other set is a high-pressure gas cylinder containing nitrogen used to purge the gas path.

[0010] The gas supply pipeline includes a gas rotor flow meter, a quick-opening and closing valve, a steel gas pipeline, and a pressure reducing valve;

[0011] The heating device is a horizontal tubular heating furnace, which has multiple parallel independent channels of the same size inside, and a quartz tube is installed in each parallel independent channel.

[0012] The exhaust gas treatment device includes two gas washing bottles containing NaOH solution placed one in front of the other and several connecting pipes.

[0013] Each group of high-pressure gas cylinders, gas washing cylinders, and quartz tubes has the same number of components. The steel gas pipelines include interconnected steel gas pipeline 1, steel gas pipeline 2, and steel gas pipeline 3. High-pressure gas cylinders containing corrosive gases are connected to steel gas pipeline 1, and high-pressure gas cylinders containing nitrogen are connected to steel gas pipeline 2. Steel gas pipeline 3 is connected to the inlet of each quartz tube. In the two groups of gas washing cylinders, the gas washing cylinders in the first group and the gas washing cylinders in the second group are connected in series and then connected to the outlet of the corresponding quartz tube through connecting conduits. Steel gas pipeline 1 and steel gas pipeline 2 are equipped with pressure reducing valves and quick-opening / closing valves, respectively. Steel gas pipeline 3 is equipped with a gas rotor flow meter.

[0014] Preferably, the pressure reducing valve is installed at the outlet of the high-pressure gas cylinder on steel gas pipeline one and steel gas pipeline two.

[0015] Preferably, the pressure reducing valves at the outlet of the high-pressure gas cylinder on the steel gas pipeline are all corrosion-resistant type pressure reducing valves.

[0016] Preferably, the steel gas pipeline and all joints on the pipeline, as well as the quick-opening and closing valve, are made of corrosion-resistant stainless steel.

[0017] Preferably, all gas rotor flow meters are of corrosion-resistant type.

[0018] Preferably, the corrosive gas is a binary mixture of "corrosive gas + nitrogen" or a ternary mixture of "corrosive gas + nitrogen + oxygen" pre-mixed by the gas supplier at a specified concentration. The corrosive gas may be an acidic gas such as HCl or SO2.

[0019] Preferably, the tubular furnace is equipped with five quartz tubes of the same size.

[0020] Preferably, the two sets of high-pressure gas cylinders containing compressed gas consist of 10 cylinders, including 5 high-pressure gas cylinders containing corrosive gas for providing the gas environment inside the furnace and 5 high-pressure gas cylinders containing nitrogen for purging the gas path.

[0021] Preferably, the two sets of gas washing bottles containing NaOH solution placed one after the other consist of 5 bottles each, for a total of 10 bottles.

[0022] Preferably, the steel gas pipeline one, steel gas pipeline two, and steel gas pipeline three are connected by a T-shaped tee.

[0023] The beneficial effects of this utility model are: (1) The gas supply pipeline and pipeline fittings are all made of corrosion-resistant materials or models, which can be used for corrosion test gas supply of acidic gases such as HCl and SO2, and can meet the needs of high-temperature corrosion test in simulated biomass boiler flue gas environment; (2) The tubular furnace adopts a design of multiple quartz tubes, which can realize multiple test conditions at the same temperature, which can significantly improve the test scale and test efficiency, and can also be used for simultaneous control test of strictly controlled single variable, improving the accuracy of such test results; (3) The gas supply pipeline design considers a nitrogen purging system, which ensures that no corrosive gas remains in the test device after each test, which will not damage the device or pose a safety hazard to laboratory personnel; (4) Each quartz tube is equipped with an independent gas supply system, and each independent gas supply system has the functions of nitrogen purging and supplying corrosive test gas at the same time, so as to ensure that the high-temperature flue gas corrosion test in each furnace tube runs independently and is not interfered with each other. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] In the diagram: 1. Corrosive gas, 2. Nitrogen, 3. Pressure reducing valve, 4-1. Steel gas pipeline one, 4-2. Steel gas pipeline two, 4-3. Steel gas pipeline three, 5. Quick-opening and closing valve, 6. Gas rotor flow meter, 7. Quartz tube, 8. Horizontal tubular heater, 9. Connecting conduit, 10. Gas washing bottle. Detailed Implementation

[0026] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0027] Example: Figure 1As shown, a high-efficiency, multi-threaded high-temperature flue gas corrosion testing device includes a high-pressure gas source, a gas supply pipeline, a heating device, and an exhaust gas treatment device. The high-pressure gas source consists of 10 high-pressure gas cylinders containing compressed gas, including 5 high-pressure gas cylinders containing corrosive gas 1 for providing the gas environment inside the furnace, and 5 high-pressure gas cylinders containing nitrogen 2 for purging the gas path; the gas supply pipeline includes 10 pressure reducing valves 3, several steel gas pipelines 4 (steel gas pipeline 1 4-1, steel gas pipeline 2 4-2, steel gas pipeline 3 4-3), 10 quick-opening and closing valves 5, and 5 gas rotor flow meters 6; the heating device is a horizontal tubular heater 8, which has 5 parallel independent channels of the same size to provide installation positions for 5 quartz tubes 7; the exhaust gas treatment device includes 10 gas washing bottles 10 containing NaOH solution and several connecting conduits 9, with every 2 gas washing bottles 10 connected in series and then connected to the outlet of 1 quartz tube 7 through the connecting conduit 9.

[0028] Specifically, the five high-pressure gas cylinders providing corrosive gas source 1 are all lined with an anti-corrosion coating to ensure that the inner walls of the cylinders are not corroded by the corrosive gas; the five high-pressure gas cylinders providing nitrogen source 2 do not require an anti-corrosion coating. For the ten high-pressure gas cylinders containing compressed gas, the outlets of the five high-pressure gas cylinders containing nitrogen 2 are equipped with ordinary pressure reducing valves, while the outlets of the other five high-pressure gas cylinders providing corrosive gas 1 are equipped with corrosion-resistant pressure reducing valves to prevent corrosion and failure after long-term operation. All steel gas pipelines 4 and all joints on the pipelines, as well as the ten quick-opening and closing valves 5, are made of corrosion-resistant stainless steel, such as 316L stainless steel, to prevent the gas supply pipelines from being corroded by corrosive gases over a long period. The five gas rotor flow meters 6 are all of corrosion-resistant type, and their specific ranges can be selected according to test requirements or relevant standards. The five gas rotor flow meters 6 are all located after the T-junction and before the quartz tube inlet to detect, display, and regulate the gas flow rate in the quartz tube.

[0029] Corrosive gas 1 is a binary mixture of "corrosive gas + nitrogen" or a ternary mixture of "corrosive gas + nitrogen + oxygen" pre-mixed by the gas supplier at a specified concentration. The specific mixture can be determined according to the experimental requirements. For example, when simulating the effect of HCl concentration on the corrosion of heated surfaces, it can be "HCl + N2" or "HCl + N2 + O2". By fixing the ratio of HCl and N2 when the manufacturer fills the gas cylinder with the mixture, the effect of different HCl concentrations in the cylinder can be achieved.

[0030] Unlike conventional single-channel tube furnaces, the tube furnace of this invention has five identical channels (8) inside, which can accommodate five identical quartz tubes (7). In actual testing, each quartz tube (7) can hold the sample to be tested and allow gas to pass through it. The tube furnace (8) then heats all five quartz tubes (7) simultaneously, enabling high-temperature corrosion tests under different atmospheres to be conducted at the same temperature.

[0031] During each test, only the corrosive gas source needs to be turned on, not the nitrogen source. After each test, the cylinder valve, pressure reducing valve 3, and quick-opening valve 5 on the gas line branch containing corrosive gas 1 can be closed. Then, the nitrogen supply to the nitrogen line branch 2 can be turned on to purge the used gas lines and prevent corrosive gas 1 from remaining inside the device after the test.

[0032] Any matters not covered in this utility model are common knowledge.

[0033] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A high-efficiency, multi-threaded high-temperature flue gas corrosion simulation test device, characterized in that, It includes a high-pressure gas source, gas supply pipeline, heating device and exhaust gas treatment device; The high-pressure gas source consists of two high-pressure gas cylinders containing compressed gas. One set is a high-pressure gas cylinder containing corrosive gas used to provide the gas environment inside the furnace, and the other set is a high-pressure gas cylinder containing nitrogen used to purge the gas path. The gas supply pipeline includes a gas rotor flow meter, a quick-opening and closing valve, a steel gas pipeline, and a pressure reducing valve; The heating device is a horizontal tubular heating furnace, which has multiple parallel independent channels of the same size inside, and a quartz tube is installed in each parallel independent channel. The exhaust gas treatment device includes two gas washing bottles containing NaOH solution placed one in front of the other and several connecting pipes. Each group of high-pressure gas cylinders, gas washing cylinders, and quartz tubes has the same number of components. The steel gas pipelines include interconnected steel gas pipeline 1, steel gas pipeline 2, and steel gas pipeline 3. High-pressure gas cylinders containing corrosive gases are connected to steel gas pipeline 1, and high-pressure gas cylinders containing nitrogen are connected to steel gas pipeline 2. Steel gas pipeline 3 is connected to the inlet of each quartz tube. In the two groups of gas washing cylinders, the gas washing cylinders in the first group and the gas washing cylinders in the second group are connected in series and then connected to the outlet of the corresponding quartz tube through connecting conduits. Steel gas pipeline 1 and steel gas pipeline 2 are equipped with pressure reducing valves and quick-opening / closing valves, respectively. Steel gas pipeline 3 is equipped with a gas rotor flow meter.

2. The high-efficiency multi-threaded high-temperature flue gas corrosion simulation test device according to claim 1, characterized in that, The pressure reducing valve is installed at the outlet of the high-pressure gas cylinder on steel gas pipeline one and steel gas pipeline two.

3. The high-efficiency multi-threaded high-temperature flue gas corrosion simulation test device according to claim 2, characterized in that, The pressure reducing valves at the outlet of the high-pressure gas cylinder on the steel gas pipeline are all corrosion-resistant type.

4. The high-efficiency multi-threaded high-temperature flue gas corrosion simulation test device according to claim 1, characterized in that, The steel gas pipeline, all joints on the pipeline, and the quick-opening and closing valve are all made of corrosion-resistant stainless steel.

5. The high-efficiency multi-threaded high-temperature flue gas corrosion simulation test device according to claim 1, characterized in that, All gas rotor flow meters are selected from corrosion-resistant types.

6. The high-efficiency multi-threaded high-temperature flue gas corrosion simulation test device according to claim 1, characterized in that, The corrosive gas is a binary mixture of "corrosive gas + nitrogen" or a ternary mixture of "corrosive gas + nitrogen + oxygen" of a specified concentration, pre-mixed by the gas supplier.

7. The high-efficiency multi-threaded high-temperature flue gas corrosion simulation test device according to claim 1, characterized in that, The tubular furnace contains five identical quartz tubes.

8. The high-efficiency multi-threaded high-temperature flue gas corrosion simulation test device according to claim 1, characterized in that, The two sets of high-pressure gas cylinders containing compressed gas consist of 10 cylinders, including 5 high-pressure gas cylinders containing corrosive gas for providing the gas environment inside the furnace and 5 high-pressure gas cylinders containing nitrogen for purging the gas path.

9. The high-efficiency multi-threaded high-temperature flue gas corrosion simulation test device according to claim 1, characterized in that, The two sets of gas washing bottles containing NaOH solution, placed one in front of the other, consist of 5 bottles in each set, for a total of 10 bottles.

10. The high-efficiency multi-threaded high-temperature flue gas corrosion simulation test device according to claim 1, characterized in that, The steel gas pipeline 1, steel gas pipeline 2, and steel gas pipeline 3 are connected by a T-shaped tee.

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