1 Process flow for conveying chlorine gas in raw liquid ring type chlorine compressor
1.1 The medium transported by the liquid-ring chlorine compressor is chlorine gas, and the chlorine gas can not be in contact with water. Otherwise, hypochlorous acid is generated, which causes strong corrosion to the equipment. Concentrated sulfuric acid does not react with chlorine gas, and can absorb trace water in chlorine gas. It is most suitable for the medium of the liquid ring type chlorine compressor working fluid, but under the higher pressure, the chlorine gas containing sulfuric acid is removed by the acid separator and the acid mist trap, but it is inevitable that a trace amount of sulfuric acid is brought into the chlorine gas. The liquefaction system forms a deposited acid sludge in the liquid chlorine storage tank, which affects the quality of the liquid chlorine product. In the process of filling the liquid chlorine, the cylinder valve is blocked. In this case, the liquid chlorine in the cylinder must be treated first. Then, the bottle valve can be cleaned, the process is time-consuming and laborious, and the liquid chlorine storage tank should be cleaned once a year. Sulfuric acid is lost during the cycle and should be replenished in time to keep the level of concentrated sulfuric acid within the specified range. After the concentrated sulfuric acid is changed to dilute sulfuric acid, it will cause strong corrosion to the compressor. Therefore, it must be ensured that the concentration of sulfuric acid cannot be lower than 93%. The analyst should periodically analyze the concentration of sulfuric acid. When the concentration of sulfuric acid is lower than 93%, the system should be The sulfuric acid is discharged, replaced or supplemented with 98% concentrated sulfuric acid, so that the concentration of sulfuric acid is kept within the allowable range, and the diluted acid released will pollute the environment.
1.2 The equipment has many faults and the maintenance strength of the workers is large. In addition to the normal situation of 4-5 spare machines, 7-8 compressors are equipped with one machine head. Once the compressor fails, the machine head is directly replaced, and then the removed machine head is repaired for later use. . It is equipped with 4 maintenance personnel to repair the chlorine compressor, and the maintenance personnel are repairing the equipment every day. In normal operation, the life cycle of the liquid-ring chlorine compressor is 2-3 months. The machine seal, impeller, bushing and other accessories are very expensive. According to statistics, the annual maintenance cost is about 500,000 yuan.
1.3 Equipment is low in efficiency and consumes a lot of energy. The liquid ring type chlorine gas compressor is made of ductile iron. The liquid ring used is 98% concentrated sulfuric acid. Its density is 1.84g/cm3, so the power of the motor is enlarged accordingly. The YLJ-1250/3.0 liquid ring type chlorine compressor is single. The motor power is 110Kw, the designed displacement is 1250m3 /h, and the designed maximum discharge pressure is 0.3Mpa. Theoretically, concentrated sulfuric acid does not corrode carbon steel, but in actual operation, it will be affected by the change of sulfuric acid concentration, which will still cause certain damage to the equipment. The working pressure of the liquid-ring chlorine compressor in operation is 0.2Mpa, the displacement is obviously lower than the designed gas volume, and the driving capacity is 150,000 tons of caustic soda. When the chlorine gas is delivered, it is actually opened to 7-8 sets. Since the chlorine gas discharge pressure is only 0.2Mpa, the chlorine gas liquefaction temperature needs to be -15 °C to -20 °C. See Table 1. The LG20 freezer in the liquid chemical section needs to open 5 sets in the summer and 3 sets in other seasons to meet the chlorine gas liquefaction. need.
2 chlorine gas turbine works
The motor drives the turbine planetary gearbox to increase the gearbox to high speed. The output shaft of the gearbox is connected to the shaft of the compressor through the coupling, so that the impeller fixed on the shaft rotates at a high speed, and the working wheel with high speed rotation will be used. Its mechanical energy is transferred to the gas, thereby increasing the pressure of the chlorine gas. Anbang's chlorine gas turbine compressor is a four-stage compression. After the chlorine gas is compressed by each stage of impeller, it enters the intercooler to cool, and then enters the next stage for compression to ensure that the temperature after the chlorine gas is compressed does not exceed 40 ° C. The pressure can reach 0.7Mpa.
3 chlorine gas turbine working conditions
The process of delivering chlorine gas by a turbo compressor is essentially different from the process of delivering chlorine gas by a liquid-ring chlorine compressor. The turbine does not need to recycle the working fluid, eliminating the sulfuric acid circulation system, the dilute acid storage system, and the sulfuric acid separation and capture system is placed at the compressor inlet, due to the turbine compressor material GG-25 (equivalent In domestic HT-250), the chlorine content in chlorine gas is higher. The design requirement is 200mgH2O/Nm3, which can be controlled at 50mgH2O/Nm3. In the inlet part, a blister drying tower is added, and the imported acid mist trap is added. The Monsanto defogger is used, and the defogging effect is better. During the three years of operation, the liquid chlorine storage tank was not cleaned, and the bottle valve was not clogged when the cylinder was filled.
The device was turned on in October 2007 and the device operated smoothly. In November 2008, the chlor-alkali system was shut down for maintenance, and the compressor was maintained. Since the car was driven a week later, it has been running continuously for nearly 18 months except for one power failure trip and the operator accidentally hitting the axial displacement transmitter for 8 hours.
The device is highly efficient and has low energy consumption. The designed displacement is 6500 m3 / h, and there is a surplus of 150,000 tons of chlor-alkali system. The motor power is 700Kw, the rated exhaust pressure is 0.7Mpa, the normal opening is 0.5Mpa, the liquefaction temperature of chlorine is 0-10°C, and the liquid chemical section LG20 is frozen. The machine will open 2 sets in summer and 1 set in other seasons.
The shaft seal of the chlorine gas turbine adopts a closed gas structure, the labyrinth is circulated on the shaft, and the sealing gas is made of nitrogen. The nitrogen consumption is 36 Nm/h per minute and the nitrogen pressure is maintained at 0.7 MPa. Compared with the liquid ring chlorine compressor, the operation of the turbine requires a nitrogen system.
4 Energy saving and environmental protection benefits of using chlorine gas turbine
(1) Saving the cost of concentrated sulfuric acid: The chlorine gas turbine does not need working fluid, and can save nearly 1,000 tons of concentrated sulfuric acid per year. It is calculated at a price of 1400 yuan per ton of 98% sulfuric acid, saving 1.4 million yuan per year. At the same time, it can reduce 1200 tons of waste sulfuric acid to the environment.
(2) Power saving cost: 7 sets of liquid ring type chlorine compressor motor total power 770kW, 1 set of chlorine gas turbine motor power 700Kw, reducing installed capacity 70Kw; liquefaction system uses 2.5 sets of LG20 freezer on average, reducing installed capacity 550Kw Total reduction of motor power 620Kw. Calculated by 360 days in 1 year, electricity cost 0.56 yuan / kWh, efficiency 0.8, annual electricity saving 620 × 360 × 24 × 0.56 × 0.8 = 2.4 million.
(3) Annual maintenance and maintenance costs of 500,000 yuan.
(4) New nitrogen consumption: 360 × 24 × 36 × 0.4 = 12,400 yuan.
(5) Total: Taking the annual output of 150,000 tons of chlor-alkali as an example, the use of chlorine gas turbine can save 140+240+50-12.44=417.56 million yuan than liquid ring type chlorine compressor.
(6) Investment recovery period: The system transformation cost will be about 10 million yuan, and the investment can be recovered in only 2.4 years.
5 summary
Due to the significant investment benefit of the chlorine gas turbine compared to the liquid ring chlorine compressor, most of the domestic chlor-alkali plants have modified the original chlorine gas transportation system. For the new chlor-alkali project, the chlorine gas turbine is generally used as the transportation. Chlorine equipment. Anbang's 200,000 tons of ion-exchange membrane caustic soda uses a chlorine gas turbine with a discharge pressure of 1.0 MPa, and the energy-saving effect is more obvious. At present, the most used chlorine gas turbine in domestic chlor-alkali plants is produced by Siemens 3K, Germany. The exhaust pressure is 0.5-0.7Mpa, and the chlorine turbine produced by Japan's Maekawa Co., Ltd. is also used. Domestic large-scale turbines that transport natural gas, propylene, carbon dioxide and other media can reach 7Mpa, and the gas volume can reach 50,000m3 / h. However, due to the low profit margin, some turbines that transport chlorine gas are well-known. The flat machine manufacturer has not carried out research and development. Only some small enterprises produce it. The exhaust pressure of the chlorine gas turbine can generally reach 0.4Mpa, which can support 10-15 thousand tons/year chlor-alkali project, and some chlor-alkali enterprises begin trial use. With the accelerated development of domestic turbine manufacturers, the replacement of imported chlorine turbines by domestic chlorine turbines will become a trend.
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1.Application : For sport equipment
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3.Material: A6063, A6061, A3003 and other series alu alloy
4.Suface treatment: Anodizing, polishing, turning ,power coating, mill finish etc
5.Equipment: CNC ,extruding machine, cold drawn machine, heating oven, straightening machine, cutting machine
|
OD |
OD Tolerance |
ID Tolerance |
Roundness |
Straightness |
Circular run-out |
|
φ16-20 |
±0.02 |
±0.02 |
0.01↓ |
0.015↓ |
0.05↓ |
|
φ20-30 |
±0.02 |
±0.02 |
0.01↓ |
0.015↓ |
0.05↓ |
|
φ30-50 |
±0.05 |
±0.05 |
0.02↓ |
0.020↓ |
0.08↓ |
|
φ50-80 |
±0.15 |
±0.10 |
0.05↓ |
0.025↓ |
0.10↓ |
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7. Trade Terms
1. Payment: 30% T/T in advance, 70% balance pay before delivery. L/C at sight.
2. Delivery time: 20 days after deposit receiverd. If opening mould, plus 7-10 days.
3. Trade Term can be chosen depending on your requirements.
4. FOB Port: Shanghai
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