Announcement on issuing technical requirements for rotary zeolite adsorption and concentration unit (T / CAEPI 31-2021)

China Environmental Protection Industry Association

Standard Bulletin

No.2 of 2021 (general No.26)

Technical requirements for rotary zeolite adsorption and concentration unit (T / CAEPI 31-2021) approved by China Environmental Protection Industry Association is hereby announced.

China Environmental Protection Industry Association

April 13, 2021

Technical requirements of rotary zeolite adsorption concentration device

1 scope of application

This standard specifies the basic requirements, performance requirements, inspection methods, inspection rules, marking, packaging, transportation and storage of rotary zeolite adsorption concentration device.

This standard is applicable to the rotary zeolite adsorption and concentration device for the treatment of waste gas containing volatile organic compounds.

2 normative references

The contents in the following documents constitute indispensable provisions of this standard through normative references. For dated references, only the edition corresponding to the date is applicable to this standard; For undated references, the latest version (including all amendments) is applicable to this standard.

GB / T 1031 geometrical product specification (GPS) - surface roughness parameters and their numerical values by surface texture profile method

GB / T 5226.1 electrical safety of machinery electrical equipment of machinery part 1: General technical conditions

GB / T 8770 determination of dynamic water adsorption on molecular sieve

GB / T 13306 label

GB / T 13384 general specification for packaging of mechanical and electrical products

GB / T 16157 determination of particulate matter and sampling method of gaseous pollutants in exhaust gas from stationary sources

GB / T 28878.1 specification for rotating parts in space science experiments Part 1: general design principles

Hg / T 20507 design specification for automatic instrument selection

Determination of total hydrocarbons, methane and non methane hydrocarbons in waste gas of HJ 38 stationary pollution source by gas chromatography

HJ / T 386 technical requirements for environmental protection products industrial waste gas adsorption purification device

HJ 732 gas bag sampling method of volatile organic compounds in waste gas from stationary pollution sources

Determination of volatile organic compounds in waste gas of HJ 734 stationary source by solid phase adsorption thermal desorption / gas chromatography mass spectrometry

JB / T 5000.3 general specification for heavy machinery part 3: Weldments

JB / T 5943 general specification for welding parts of construction machinery

JB / T 5945 general specification for construction machinery assembly

3 terms and definitions

The following terms and definitions are applicable to this standard.

3.1 volatile organic compounds, VOCs

Organic compounds involved in atmospheric photochemical reactions or determined according to relevant regulations.

3.2 zeolites

A kind of aluminosilicate molecular sieve adsorption materials with regular pore structure, including natural zeolite and synthetic zeolite.

3.3 zeolite rotor

Using zeolite as adsorbent, the rotary adsorption parts are usually divided into two types: rotary table type and rotary cylinder type.

3.4 zeoliterotary concentrator

The device is composed of zeolite runner, runner shell and supporting frame, motor and transmission mechanism, inlet and outlet pipeline and insulation layer, which has the function of adsorption, desorption and concentration. It is called "concentration device" for short.

3.5 apparent gas velocity

According to the ventilation cross-sectional area of the runner and the flow velocity of the gas flowmeter under the working condition, unit: M / s.

3.6 pressure drop

The resistance of air flow through the concentration device is the difference of average total pressure at the inlet and outlet, in PA.

3.7 explosive limit

The concentration range of combustible gas or vapor that can explode when mixed with air. It is also called explosive concentration limit.

3.8 lower explosive limit

The minimum concentration of explosion limit.

3.9 purification efficiency

The ratio of the amount of pollutants removed after treatment by the purification unit to the amount before treatment, expressed as a percentage.

3.10 concentration ratio

The ratio of the volume flow rate of treatment gas to the volume flow rate of desorption gas in the concentration unit.

4 basic requirements

4.1 applicable conditions

4.1.1 the concentration device is generally applicable to the treatment of waste gas with air volume more than 5000m3 / h and VOC concentration less than 1500mg / m3.

4.1.2 the concentration of particulate matter in the waste gas entering the concentration unit shall not exceed 1mg / m3.

4.1.3 the waste gas entering the concentration unit should not contain components easy to polymerize, deposit and corrode.

4.1.4 the temperature of waste gas entering the concentration unit should not exceed 40 ℃ ° C。

4.1.5 the maximum operating temperature in the concentration unit should not exceed 300 ℃ ° C。

4.1.6 the relative humidity of waste gas entering the concentration unit should not exceed 80%.

4.2 structure and materials

4.2.1 depending on the structure of zeolite runner, the concentration device can be rotary or rotary.

4.2.2 the material of zeolite runner shall be hydrophobic zeolite or modified zeolite material according to the type of pollutants, and shall have high temperature resistance and non flammability.

4.2.3 the zeolite runner shall adopt modular design.

4.2.4 carbon steel plate and stainless steel plate can be selected for zeolite runner shell according to actual working conditions.

4.2.5 zeolite runner and shell should be sealed with sealing material between each partition, and the sealing material should be temperature resistant higher than 300 ℃ ° C material.

4.2.6 the concentration unit is usually divided into adsorption area, desorption area and cooling area according to different functions. If there is no cooling zone to meet the purification requirements, there may be no separate cooling zone.

4.2.7 the motor in the concentration unit shall be equipped with a reduction motor with appropriate reduction ratio.

4.2.8 chain drive should be adopted in the transmission part of concentration unit, and the meshing of chain and sprocket teeth should be used to transmit power and motion.

4.2.9 the inlet and outlet pipes of the desorption area and the outlet pipes of the cooling area of the concentration unit shall be equipped with insulation layer.

4.2.10 the device for adjusting and measuring the speed shall be set in the concentration unit.

4.2.11 the temperature and pressure indicating devices in accordance with Hg / T 20507 shall be set in each section of the concentration unit.

4.2.12 the built-in drive motor of concentration device shall be explosion-proof motor.

4.2.13 fire fighting facilities shall be set up in the installation area of concentration unit according to regulations.

4.3 manufacturing, processing and assembly

4.3.1 the production, manufacture and installation of the whole machine and its components shall be provided with standard drawings, and shall be processed and manufactured according to the regulations.

4.3.2 the surface of zeolite runner shall meet the following requirements:

a) The number of surface pits of the whole zeolite runner should be no more than 3, and the maximum size of surface pits should be no more than 5mm;

b) The appearance color shall be uniform without obvious color difference;

c) The surface of zeolite runner shall be smooth and the roughness shall meet the requirements of GB / T 1031.

4.3.3 zeolite runner size shall meet the following requirements:

a) The diameter deviation of zeolite runner should be ≤ 5mm;

b) The block flatness of each zeolite runner should be ≤ 0.5mm, and the overall flatness of zeolite runner should be ≤ 1.0mm;

c) The width of sealing position of zeolite runner should be controlled at 8-15mm.

4.3.4 the supporting frame shall meet the following requirements:

a) The dimensional tolerance of the frame part shall meet the requirements of class a tolerance specified in JB / T 5000.3;

b) The inclination of frame column shall meet the class a requirements specified in JB / T 5000.3.

4.3.5 the assembly shall meet the following requirements:

a) The gap between zeolite runner and frame should be controlled within 10-20 mm;

b) The end run out should be less than or equal to 5 mm;

c) The appearance of the shell should be flat without unevenness;

d) Continuous welding shall be used for joint welding at material splicing;

e) The assembly of fasteners shall meet the assembly requirements of JB / t5945;

f) The welding seam of concentration device shall meet the requirements of JB / T 5943: the welding seam with sealing requirements shall not have leakage;

g) The opening, closing and stopping control of concentration unit shall be sensitive and reliable.

4.3.6 appearance of concentration unit

a) The outer surface shall be free of obvious scratch, rust spot and indentation, with smooth performance, uniform spraying layer, consistent color, no flow mark, bubble and spalling;

b) The appearance of the whole machine should be neat and the outline should be clear. The exposed machined surface and the surface to be antirust should be cleaned and coated with antirust paint or antirust grease.

4.3.7 the design, manufacture and electrical safety of electrical equipment of the device shall meet the requirements of GB / T 5226.1.

4.3.8 whole machine operation

a) The zeolite runner runs smoothly without abnormal noise;

b) The end run out shall meet the requirements of 4.3.5.

5 performance requirements

5.1 process parameters

5.1.1 the dynamic water absorption of zeolite in concentration unit should be less than 10%.

5.1.2 the rotating speed of zeolite runner shall be adjustable.

5.1.3 the apparent gas velocity in the adsorption zone of zeolite runner should be less than 4.5 m / s.

5.2 performance

5.2.1 under normal conditions, when the concentration of VOCs in the inlet air is more than or equal to 100mg / m3, the purification efficiency of the concentration device should be more than or equal to 90%.

5.2.2 the concentration ratio range of concentration device should be 5-30 times.

5.2.3 the pressure loss in the adsorption area, desorption area and cooling area of the concentration unit shall be ≤ 2000Pa.

5.2.4 the concentration of gas after concentration of zeolite runner shall not exceed 25% of the lower explosion limit.

6 test method

6.1 on the surface of zeolite runner, the dimension of pits on the surface of zeolite runner shall be measured by the combination of ruler and feeler gauge, and the number and appearance color of pits on the surface of zeolite runner shall be checked by visual method to see whether they meet the requirements of 4.3.2.

6.2 zeolite runner size

Use the following methods to test whether the indexes of zeolite runner size meet the requirements of 4.3.3:

a) Diameter difference of zeolite runner: measure the diameter difference of the runner with a tape with division value of 1.00mm, at least three places, take the maximum and minimum values, and calculate the difference;

b) Flatness: it adopts the measurement method of combination of flat ruler and feeler gauge. In flat ruler measurement, the datum line is reflected by simulation method, while feeler gauge is used for gap distance measurement;

c) Width of sealing place of zeolite runner: measured with flat ruler.

6.3 supporting frame

The dimensional tolerance and inclination of the frame part shall be measured according to the class a tolerance specified in JB / T 5000.3.

6.4 assembly

Use the following methods to measure whether the indicators of the assembly meet the requirements of 4.3.5:

a) Measure the end face runout of zeolite runner with dial indicator;

b) Visually inspect whether the shell of the concentrator is flat;

c) The welding quality inspection of plate is carried out according to JB / T 5943;

d) The assembly quality inspection of fasteners is carried out according to JB / t5945;

e) The weld quality inspection of the concentration device is carried out according to JB / T 5943.

6.5 appearance of concentration unit

The appearance of the concentration unit shall be visually inspected to see if it meets the requirements of 4.3.6.

6.6 electrical safety

The design, manufacture and electrical safety of the electrical equipment of the concentration unit are in accordance with the requirements of GB / T 5226.1.

6.7 whole machine operation

The operation inspection of the whole machine shall meet the following requirements:

a) When the machine is started up, electric test shall be conducted to confirm whether the motor steering direction is consistent with the direction specified by the zeolite runner logo (the zeolite runner rotates from the desorption area to the cooling area);

b) After starting up and running, check whether the sprocket and chain are not meshed smoothly; In case of meshing difficulty and abnormal vibration, it is necessary to adjust the chain and transmission structure in time;

c) Start the motor, the chain drives the runner to rotate, and use the dial indicator (measuring range is 10 mm, accuracy is 0.1 mm) to measure the end face runout of the runner. The end face runout distance shall comply with the provisions of 4.3.4 to ensure that the runner runs symmetrically along the central axis.

6.8 performance requirements

6.8.1 dynamic water absorption

The leftover material of zeolite runner is grinded and sieved as test powder. The test method should meet the requirements of GB / t8770. 6.8.2 zeolite runner speed

The rotating speed of zeolite runner shall be measured by tachometer, and the test method shall meet the requirements of GB / T 28878.1.

6.8.3 purification efficiency

The determination of purification efficiency should meet the following requirements:

a) The gas concentration was detected according to HJ 38, HJ 734 and HJ 734