Product Application 1. Brief Introduction According to the technical requirements of your company, Zhoushan Willman Machinery Technology Co., Ltd. (hereinafter referred to as Willman Machinery) has prepared the technical scheme of liquid nitrogen machine. The terms and units used and  implemented  in  the  technical  scheme  are  in  accordance  with  the  relevant standards of the People's Republic of China. Willman Machinery is responsible for the authenticity and rigor of this technical solution. According to user requirements, liquid nitrogen equipment design requirements are as follows: 2. 1 Product Design Parameter Product nitrogen purity: 99.9% Product nitrogen dew point ≤-40℃ Liquid nitrogen yield: 10 L/h 2.2 Functional Requirements for Product Design 1. nitrogen equipment adopts pressure swing adsorption process. 2.  nitrogen  equipment  can  have  RS485  communication  interface,  equipment parameters and running status can communicate with DCS. 3. nitrogen equipment with unqualified oxygen sound and light alarm function, nitrogen gas for a long time unqualified automatic shutdown protection function. 4. Liquid nitrogen equipment adopts cryogenic mixed working medium throttling refrigerator  as  cold  source,  compact  structure,  can  continuously  and  conveniently supply liquid nitrogen, can be used as the supply source of small amount of liquid nitrogen in the region. Schematic diagram of simple process of PAS nitrogen production equipment 4. 1 Nitrogen specifications of finished products Mode Item Value Item Value  WMN-10L Nitrogen gas flow 12Nm3/h Nitrogen gas purity 99.9% The nitrogen pressure 0.1-0.4 mpa Nitrogen gas dew point ≤-40℃ Note: All pressures in this paper are gauge pressure values unless otherwise specified. Flow unit "Nm3/h" means the flow unit at 20℃ , 0. 101MPa(absolute pressure); 4.2 Equipment boundary area This  set  of pressure  swing  adsorption  nitrogen  production device consist of air  source  system,  air  filtration  system,  oxygen  and separation and nitrogen buffer system. In this technical scheme, pressure swing adsorption nitrogen production equipment within the composition range of the whole device adopts skid mounted; From the outlet of air compressor to the outlet of nitrogen storage tank, all equipment, connecting pipes, flanges and other materials in a single skid block are included. 4.3 Public Works 4.3. 1  Water,  electricity,  compressed  air  and  equipment  installation  and  operation environment required by the user must meet the following requirements: 1) Power supply conditions Category Value Remarks 380V/50Hz 7.5KW crew air compressor 220 V/50Hz 0. 15KW 2) Ambient air conditions  Ambient Air Quality Oxygen content 20. 1%(V) Temperature ≤45℃ Particle size ≤5μm oil content ≤3mg/m3 CO2 ≤350ppm C2H2 ≤0.5ppm CnHm ≤30ppm ∑(NOx+SO2+HCl+Cl2) ≤8ppm 3)Equipment installation and operation environment Ambient temperature： 2℃~40℃ Relative humidity： ≤80% Atmospheric pressure： 80kPa~106kPa Dry, clean, well ventilated, no corrosive substances around.   4.3.2 Installation site requirements 1) The equipment shall be stored in a dry, clean, well-ventilated warehouse with no corrosive substances around. For short-term open storage and transportation should be covered with rain cloth, and the equipment should not be in direct contact with the ground. 2)Indoor installation site environmental temperature is 2 ~ 40℃ , relative humidity ≤ 80%. 3)  Installation  requirements:  Crane  or  forklift  is  easy  to  reach  and  install.  The ground is flat, and the distance between equipment and wall or other equipment shall not be less than 800mm; The sewage outlet must be connected to the outside of the device with a pipe. 4.3.3 Site installation 1) The buyer shall install according to the installation atlas provided by the supplier. 2) The purchaser shall be responsible for unloading the equipment and placing each section of the equipment in a predetermined position. 3)  The buyer shall provide labor connection and assembly equipment to prepare for start-up. 4)The  buyer  shall  provide  labor  services  and  materials  by  contacting  various necessary facilities (electricity, gas and water). 5. Liquid nitrogen equipment mainly introduced: Nitrogen liquefier is a cryogenic mixing medium saving flow refrigerator driven by a single   compressor   with   pre-cooling   to   achieve   nitrogen   liquefaction   (- 180℃). Cryogenic  mixed  refrigerant  throttling  refrigerant  is  based  on  the  regenerative multiple mixed refrigerant throttling refrigeration cycle, from the ambient temperature to the target refrigeration temperature, the selection of high, medium and low boiling point pure components composed of multiple mixed working medium, to achieve the effective cooling temperature of each boiling point components relay matching, is a kind of refrigeration machine can efficiently achieve -40~ 196℃ temperature range.   Main technical parameters: Note: Liquid nitrogen yield: 10L/h Parameter Size 1650×1000×2000 mm Weight 700 kg Refrigerator Mixed refrigerant throttling refrigerator Cooling type Water cooling Cooling time Hot cooling time:﹤ 90minCold cooling time﹤30min Power 8.5kw Voltage AC308V 50HZ 3phase Environmental requirements Temp.:≤ 300CAltitude : ≤ 1000m Nitrogen gas purity ≥99.9% The nitrogen pressure 0.1-0.4Mpa Adjustable Nitrogen gas dew point ≤-400C Nitrogen gas flow ≥12Nm3/h  6.Product quality assurance 6. 1  Nitrogen  product  quality  assurance  commitment  for  psa  nitrogen production  ：   Name The equipment parameters Nitrogen gas flow ≥12Nm3/h Nitrogen gas purity ≥99.9% The nitrogen pressure 0.1-0.4Mpa Adjustable Nitrogen gas dew point ≤-400C   Continuous operation of equipment 8500hoursce Service life of key component 1) Adsorbent  (molecular  sieve)  service  life  ≥ 10  years  (under  normal operating conditions) 2) Pneumatic valve opening time ≤0.2 seconds , service life ≥  1.5 million times 6.2 Liquid nitrogen product quality assurance commitment：   Name The equipment parameters Liquid nitrogen production 10L/Hour Liquid nitrogen purity ≥99.9% Nitrogen flow ≥12Nm3/h Nitrogen purity   ≥99.9% Nitrogen pressure   0.1-0.4Mpa Adjustable Nitrogen dew point   ≤-400C The equipment runs 8500 hours continuously