A vacuum denitration catalyst wear strength detection device and use method

Abstract

The present invention discloses a denitration catalyst wear strength detection device in a vacuum state and a method for using the same, which is mainly used in experiments for testing the physical and chemical properties of honeycomb denitration catalysts for nitrogen-containing polluted gases in thermal power plants, and includes a cylinder, a material box, a feeder, a weighing device and a vacuum pump; a vacuum pump is provided on the material box, a feeder is provided below the material box, and the feeder is connected to the cylinder; a height gauge is installed on the side wall of the cylinder, a sample compartment door is provided in the middle of the cylinder, and a lower compartment door is provided at the bottom of the cylinder; a guide rail is installed inside the cylinder, and a weighing device is provided at the bottom of the cylinder. The denitration catalyst wear strength detection device in a vacuum state can simulate the wear conditions of the honeycomb catalyst during actual catalyst operation; it can flexibly and accurately control the speed and flow rate of the wear agent that wears the catalyst sample; the entire device is in a vacuum state, effectively avoiding dust pollution to the environment caused by the detection device; the detection device does not require a fan, which reduces noise pollution.

Description

Technical Field

[0001] The invention relates to a vacuum denitration catalyst wear strength detection device and a use method, which are mainly used for experiments on the physical and chemical characteristics test of honeycomb denitration catalysts for nitrogen-containing polluted gas in thermal power plants. Background Art

[0002] Selective catalytic reduction (SCR) denitrification technology is currently the most effective way to reduce NO in flue gas from thermal power plants. x The main means of generating harmful gases. The performance of denitration catalyst is the key to SCR denitration technology. In thermal power plants, the performance of denitration catalyst is mainly reflected in the removal of NO x The efficiency of harmful gases and whether ammonia escape meets the standards are considered. However, due to the high ash, high temperature and complex composition of flue gas in thermal power plants, the performance of denitrification catalysts is often affected by wear, blockage, poisoning and other reasons. In order to ensure that the catalysts put into operation in thermal power plants have qualified wear resistance and anti-poisoning properties, the performance of fresh catalysts needs to be tested, among which anti-wear performance is an important indicator.

[0003] At present, the experimental test standard for denitrification catalysts is "Technical Specifications for Testing of Flue Gas Denitrification Catalysts for Selective Catalytic Reduction of Thermal Power Plants" Q / CHDER 018-2015. The test method described in the standard requires the use of air as a carrier to transport the abrasive when using an abrasive for wear testing. This will cause two problems. On the one hand, the air carrier used to transport the abrasive and the impurities contained in the air will cause wear to the catalyst test sample, which will not only cause the catalyst test sample to be worn by the abrasive, but also by the air carrier, and will also be affected by air humidity, resulting in deviations in the anti-wear performance test results; on the other hand, in order to quantify the anti-wear performance impact brought by the air carrier itself, another catalyst sample is required as a comparison sample when using the catalyst test sample, which requires the comparison sample to have exactly the same anti-wear performance as the catalyst test sample, which is difficult to achieve in practice. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a vacuum denitration catalyst wear strength detection device with a reasonable structural design and a method for using the same.

[0005] The technical solution adopted by the present invention to solve the above-mentioned problem is: a vacuum denitrification catalyst wear strength detection device, characterized in that: it includes a cylinder, a material box, a feeder, a weighing device and a vacuum pump; a vacuum pump is provided on the material box, a feeder is provided below the material box, and the feeder is connected to the cylinder; a height gauge is installed on the side wall of the cylinder, a sample bin door is provided in the middle of the cylinder, and a lower bin door is provided at the lower part of the cylinder; a guide rail is installed inside the cylinder, and a weighing device is provided at the bottom of the cylinder.

[0006] Furthermore, the feeder is provided with a distributor, and the distributor is arranged with an electronic cover.

[0007] Furthermore, the cylinder is a transparent cylinder, and the state inside it can be directly observed.

[0008] Furthermore, the lower edge of the sample compartment door is higher than the upper edge of the guide rail, and the lower edge of the lower compartment door is flush with the bottom end of the cylinder.

[0009] Furthermore, the guide rail is a structure that can move up and down and is used to adjust the height of the catalyst sample.

[0010] The method for using the vacuum denitration catalyst wear strength detection device is characterized in that the process is as follows: the wear agent is loaded into the material box, the sample compartment door is opened, the catalyst sample with a mass of w1 is fixed on the guide rail, the catalyst sample is adjusted to a suitable height H according to the reading of the height gauge and fixed, the sample compartment door is closed, the electronic cover on the distributor is opened, and then the vacuum pump is turned on to evacuate the entire device. After the vacuum degree is qualified, the feeder is turned on, and the wear agent is added into the cylinder at a dosage speed of Mkg / h. The speed at which the wear agent reaches the upper surface of the catalyst sample is v. After h hours, the feeder is closed, the material weight w on the weighing device is recorded, the catalyst sample is taken out, and the weight w2 is recorded after treatment;

[0011] The flow rate of the abrasive when it reaches the upper surface of the catalyst sample:

[0012]

[0013] Where: v is the velocity of the abrasive when it reaches the upper surface of the catalyst sample, in m / s; g is the local gravitational acceleration, in m / s 2 ; H is the falling height, in meters;

[0014] Abrasive agent addition speed:

[0015] M=C*A*v*3.6 / 1000000

[0016] Where: M is the rate of adding the abrasive agent, in kg / h; v is the velocity of the abrasive agent when it reaches the upper surface of the catalyst sample, in m / s; C is the concentration of the abrasive agent, in g / m 3 ; A is the cross-sectional area of ​​the flue gas passing through the catalyst sample, in mm 2 ;

[0017] Cross-sectional area of ​​flue gas passing through the catalyst sample:

[0018] A=d 2 *n

[0019] Where: A is the cross-sectional area of ​​the flue gas passing through the catalyst sample, in mm 2 ; d is the pore size of the honeycomb catalyst, in mm; n is the number of pores in the honeycomb catalyst sample;

[0020] Abrasion resistance of catalyst samples:

[0021]

[0022] where ξ h is the catalyst's anti-wear strength, in %; w is the mass of the wear agent, in kg; w1 is the mass of the catalyst sample before testing, in g; w2 is the mass of the catalyst sample after testing, in g.

[0023] Compared with the prior art, the present invention has the following advantages and effects: the vacuum denitration catalyst wear strength detection device can simulate the wear condition of the honeycomb catalyst during the actual catalyst operation; the speed and flow rate of the abrasive agent wearing the catalyst sample can be flexibly and accurately controlled; the entire device is in a vacuum state, which can avoid the error caused by using another catalyst comparison sample; the calculation process is simplified; and at the same time, the detection device is effectively prevented from causing dust pollution to the environment; the detection device does not require a fan, thereby reducing noise pollution. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0025] Figure 2 Schematic diagram of the structure of the feeder according to the embodiment of the present invention.

[0026] In the figure: cylinder 1, material box 2, feeder 3, sample chamber door 4, guide rail 5, catalyst sample 6, lower chamber door 7, weighing device 8, height gauge 9, vacuum pump 10, electronic cover 31, distributor 32. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0028] See also Figure 1 to Figure 2 The vacuum denitration catalyst wear strength detection device in this embodiment includes a cylinder 1, a material box 2, a feeder 3, a weighing device 8 and a vacuum pump 10; a vacuum pump 10 is provided on the material box 2, a feeder 3 is provided below the material box 2, and the feeder 3 is connected to the cylinder 1; a height gauge 9 is installed on the side wall of the cylinder 1, a sample compartment door 4 is provided in the middle of the cylinder 1, and a lower compartment door 7 is provided at the lower part of the cylinder 1; a guide rail 5 is installed inside the cylinder 1, and a weighing device 8 is provided at the bottom of the cylinder 1.

[0029] In this embodiment, a distributor 32 is provided on the feeder 3 , and an electronic cover plate 31 is arranged on the distributor 32 .

[0030] In this embodiment, the cylinder 1 is a transparent cylinder, and the state inside it can be directly observed.

[0031] In this embodiment, the lower edge of the sample chamber door 4 is higher than the upper edge of the guide rail 5, and the lower edge of the lower chamber door 7 is flush with the bottom end of the cylinder 1. If necessary, a component for fixing the catalyst sample 6 can be provided on the guide rail 5.

[0032] In this embodiment, the guide rail 5 is a structure that can move up and down, and is used to adjust the height of the catalyst sample 6.

[0033] In this embodiment, the method for using the denitration catalyst wear strength detection device in a vacuum state is as follows: the abrasive is loaded into the material box 2, the sample compartment door 4 is opened, the catalyst sample 6 with a mass of w1 is fixed on the guide rail 5, the catalyst sample 6 is adjusted to a suitable height H according to the reading of the height gauge 9 and fixed, the sample compartment door 4 is closed, the electronic cover 31 on the distributor 32 is opened, and then the vacuum pump 10 is turned on to evacuate the entire device. After the vacuum degree is qualified, the feeder 3 is turned on, and the abrasive is added into the cylinder 1 at a rate of Mkg / h. The speed at which the abrasive reaches the upper surface of the catalyst sample 6 is v. After h hours, the feeder 3 is closed, the material weight w on the weighing device 8 is recorded, the catalyst sample 6 is taken out, and the weight w2 is recorded after treatment;

[0034] The flow rate of the abrasive when it reaches the upper surface of catalyst sample 6:

[0035]

[0036] Where: v is the velocity of the abrasive when it reaches the upper surface of the catalyst sample 6, in m / s; g is the local gravitational acceleration, in m / s 2 ; H is the falling height, in meters;

[0037] Abrasive agent addition speed:

[0038] M=C*d*v*3.6 / 1000000

[0039] Where: M is the rate of adding the abrasive agent, in kg / h; v is the velocity of the abrasive agent when it reaches the upper surface of the catalyst sample 6, in m / s; C is the concentration of the abrasive agent, in g / m 3 ; A is the cross-sectional area of ​​the flue gas passing through the catalyst sample 6, in mm 2 ;

[0040] Cross-sectional area of ​​flue gas passing through the catalyst sample:

[0041] A=d 2 *n

[0042] Where: A is the cross-sectional area of ​​the flue gas passing through the catalyst sample 6, in mm 2 ; d is the pore size of the honeycomb catalyst, in mm; n is the number of pores of the honeycomb catalyst sample 6;

[0043] Anti-wear strength of catalyst sample 6:

[0044]

[0045] where ξ h is the catalyst's anti-wear strength, in %; w is the mass of the wear agent, in kg; w1 is the mass of the catalyst sample 6 before the test, in g; w2 is the mass of the catalyst sample after the test, in g.

[0046] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0047] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the protection scope of the present invention. Any changes and modifications made by any technician familiar with the technology without departing from the concept and scope of the present invention should fall within the protection scope of the present invention.

Claims

1. A method for using a vacuum denitration catalyst wear strength detection device, characterized in that: The detection device comprises a cylinder (1), a material box (2), a feeder (3), a weighing device (8) and a vacuum pump (10); the vacuum pump (10) is arranged on the material box (2), the feeder (3) is arranged below the material box (2), and the feeder (3) is connected to the cylinder (1); the feeder (3) is arranged on the material distributor (32), and the electronic cover (31) is arranged on the distributor (32); a height gauge (9) is installed on the side wall of the cylinder (1), and the cylinder (1) is provided with a height gauge (9) on the side wall of the cylinder (1). ) is provided with a sample compartment door (4) in the middle part, and a lower compartment door (7) is provided at the lower part of the cylinder (1); a guide rail (5) is installed inside the cylinder (1), and a weighing device (8) is provided at the bottom of the cylinder (1); the lower edge of the sample compartment door (4) is higher than the upper edge of the guide rail (5), and the guide rail (5) is a structure that can be moved up and down and is used to adjust the height of the catalyst sample (6); when in use, the abrasive is loaded into the material box (2) and the catalyst sample (6) is fixed on the guide rail (5); The method of use is as follows: loading the abrasive into the material box (2), opening the sample compartment door (4), fixing the catalyst sample (6) with a mass of w1 on the guide rail (5), adjusting the catalyst sample (6) to a suitable height H according to the reading of the height gauge (9) and fixing it, closing the sample compartment door (4), opening the electronic cover (31) on the distributor (32), and then turning on the vacuum pump (10) to evacuate the entire device. After the vacuum degree is qualified, turning on the feeder (3), adding the abrasive into the cylinder (1) at a feeding speed of Mkg / h, and the speed at which the abrasive reaches the upper surface of the catalyst sample (6) is v. After h hours, turning off the feeder (3), recording the weight w of the material on the weighing device (8), taking out the catalyst sample (6), weighing it after processing and recording the weight w2; The flow rate of the abrasive when it reaches the upper surface of the catalyst sample (6): Where: v is the velocity of the abrasive when it reaches the upper surface of the catalyst sample (6), in m / s; g is the local gravitational acceleration, in m / s 2 ; H is the falling height, in meters; Abrasive agent addition speed: M=C*A*v*3.6 / 1000000 Where: M is the rate of addition of the abrasive agent, in kg / h; v is the velocity of the abrasive agent when it reaches the upper surface of the catalyst sample (6), in m / s; C is the concentration of the abrasive agent, in g / m 3 ; A is the cross-sectional area of ​​the flue gas passing through the catalyst sample (6), in mm 2 ; Cross-sectional area of ​​flue gas passing through the catalyst sample: A=d 2 *n Where: A is the cross-sectional area of ​​the flue gas passing through the catalyst sample (6), in mm 2 ; d is the pore size of the honeycomb catalyst, in mm; n is the number of pores of the honeycomb catalyst sample (6); Anti-wear strength of catalyst sample (6): where ξ h is the catalyst's anti-wear strength, in %; w is the mass of the abrasive agent, in kg; w1 is the mass of the catalyst sample (6) before the test, in g; w2 is the mass of the catalyst sample after the test, in g.

2. The method for using the vacuum denitration catalyst wear strength detection device according to claim 1, characterized in that: The cylinder (1) is a transparent cylinder, and the state inside it can be directly observed.

3. The method for using the vacuum denitration catalyst wear strength detection device according to claim 1, characterized in that: The lower edge of the lower bin door (7) is flush with the bottom end of the cylinder (1).

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