翻译
JB/T/8693-1998 Large and medium-sized air separation equipment
This standard specifies the terms and definitions, classification, technical requirements, test methods, inspection rules, packing, transportation and storage of large and medium-sized air separation equipment. This Standard applies to mainly large and medium-sized air separation equipment, including cryogenic rectification (distillation equipment) separators, non-rectification (pressure swing adsorption, membrane and absorption etc.) air separation equipment and expansion turbines etc.
1. Terms and definitions
1.1 Air separation equipment
It means that air passes through air treatment process, separates into oxygen, nitrogen, argon, carbon dioxide, hydrogen and other products that are used in industry or life, with the purpose of enrichment or obtaining certain component products.
1.2 Oxygen-enriched air
Xenon and other component contents are not required to be specified in oxygen-enriched air, and the component concentration of oxygen is higher than 21%, excluding the dissolved component concentration.
1.3 Nitrogen-enriched air
Xenon and other component contents are not required to be specified in nitrogen-enriched air, and the component concentration of nitrogen is higher than 80%, excluding the dissolved component concentration.
1.4 Purity
It means the percentage of the single component concentration in the total component concentration of the product gas, excluding the dissolved component concentration, it is expressed by the percentage.
1.5 Enrichment factor
It means the ratio of the single component concentration in the product gas concentration divided by the single component concentration in the feed gas, it is expressed by the number.
1.6 Reflux ratio
It means the ratio of the mass flow of the return product in the stages to the mass flow of the feed gas, it is expressed by the number.
1.7 Air rectification distillation section
This section is the main part of the air rectification distillation equipment, its main purpose is to separate oxygen and nitrogen.
1.8 Pressure swing adsorption section
This section is the main part of the pressure swing adsorption equipment, its main purpose is to separate oxygen and nitrogen.
2. Classification
This standard divides the large and medium-sized air separation equipment into three parts.
2.1 Cryogenic rectification air separation equipment
They are used primary using to separate oxygen and nitrogen by using the differences in gas liquid equilibrium state across the temperature gradient in the long-tube condensation type rectification equipment.
2.2 Non-rectification (pressure swing adsorption, membrane and absorption etc.) air separation equipment
They are used to separate oxygen and nitrogen by using the differenece in equilibrium adsorption and solubility between the two components in a gas in the pressure swing adsorption, membrane and absorption equipment.
2.3 Expansion turbine air separation equipment
They are used to separate oxygen and nitrogen by exploiting the pressure difference between the upper and lower parts of an expansion turbine in the expansion turbine type equipment.
3. Technical requirements
3.1 Cryogenic rectification air separation equipment
3.1.1 Design requirements
a. Reflux ratios used in each stage should generally be not greater than 4.0;
b. The upper part reflux ratio should not be greater than 8;
c. The pressure loss of the air in the air rectification distillation equipment is uniform, and the liquid at the bottom of the distillation column should overflow outside of the distillation column;
d. The temperature of the reflux liquid in each stage should not be greater than the dew point temperature;
e. The joints between the refill tube and the inlet and outlet tube should be smoothly connected and reliable;
f. The feed gas supply pipe size should be greater than the liquid outlet pipe of the cryogenic rectification equipment.
g. The external piping system connected with the cryogenic rectification air separation equipment should be well isolated, with its insulation thickness not less than 50 mm and local place should not less than 100 mm;
h. Rain shelters or other protective devices should be provided in outdoor use.
3.1.2 Performance requirements
The performance requirements should meet the specified design requirements. In normal working condition, the noise of the equipment should not exceed 70dB(A); there should not be any leak on the surface joints, valves and other piping equipment; the insulation effectiveness should reach requirements.
3.2 Non-rectification (pressure swing adsorption, membrane and absorption etc.) air separation equipment
3.2.1 Design requirements
a. optimize the adsorbent type, resin type, membrane type and other forms that can best meet the design requirements;
b. The bed size of the pressure swing adsorption tower should be designed according to the operating conditions, for the adsorption section, the adsorption beds should be connected in series and distributed in air path, use insulation technology such as hydrophobic materials and hydrogen-tolerable materials;
c. The peripheral pipe area, the component collection and transfer process should be taken into consideration;
d. Rain shelters or other protective devices should be provided in outdoor use.
3.2.2 Performance requirements
The performance requirements should meet the specified design requirements. In normal working conditions, the noise of the equipment should not exceed 70dB(A); there should not be any leak on the surface joints, valves and other piping equipment; the insulation effectiveness should reach requirements.
3.3 Extension Turbine Air Separation Equipment
3.3.1 Design requirements
a. design the turbine outlet as to meet the requirements of the air compressor working pressure and air flow requirements;
b. A cold box, a vaporizer and other necessary equipments should be provided in the equipment.
c. Rain shelters or other protective devices should be provided in outdoor use.
3.3.2 Performance requirements
The performance requirements should meet the specified design requirements. In normal working conditions, the noise of the equipment should not exceed 70dB(A); there should not be any leak on the surface joints, valves and other piping equipment; the insulation effectiveness should reach requirements.
4. Test method
4.1 The performance test should be carried out according to the requirements of the design conditions, and the test should be performed separately according to the design requirements including at least the following:
a. all the individual components tests;
b. the full-scale operation test;
c. the manual control test;
d. the electric control test;
e. the full-scale integrated test;
f. additional tests (including the partial discharge test in high and medium voltage electrical equipment);
4.2 The evaluation criteria for test results of steel structures and equipments should meet the design requirements and relevant national standards.
5. Inspection
5.1 from the factory acceptance;
5.2 in the erection of on-site equipment.
6. Packing and transportation
6.1 packing
The packing method for large and medium-sized air separation equipment should select reliable and economical packing method. The packing materials and mark should conform to the relevant national regulations, international conventions, and the requirements of the contract.
6.2 transportation
The transportation mode of large and medium-sized air separation equipment should select reliable and economical transportation mode. The necessary protective measures should be taken to prevent damaged in the transportation process.
7. Storage
7.1 Inspection
There should be detailed inspection of the materials used (including raw materials, semi-finished and finished products) before storage or delivery.
7.2 Careful inspection should be conducted when the items have been accepted into the warehouse, and the items that do not meet the requirements should be rejected. Under certain circumstances, if necessary, the items should be kept in the warehouse carefully and marked with “reservation”.
7.3 Quality inspection
When the items are put into storage, the quality inspection document shall be drawn up and stored in the warehouse to establish archive records. It is necessary to insure that the items remain consistent with the national standards and regulations, as well as the contractual standards, when they are delivered.
本标准规定了大中型空气分离设备的术语、定义、分类、技术要求、试验方法、检验规则、包装、运输和贮存。本标准适用于主要为大中型空气分离设备，包括低温蒸馏（蒸馏设备）分离器、非蒸馏（压力摆动吸附、膜和吸收等）空气分离设备和扩张涡轮等。
1. 术语
