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VPSA oxygen plant pressure swing adsorption (psa) in the p

Time:2014-08-13 14:47 Hit:

VPSA oxygen plant pressure swing adsorption (psa) in the pulp enterprise applications

In this paper,

Papermaking industry is one of the top ten pillar of national economy in the developed countries, and the development of China's paper industry into the fast

Speed growth, the paper has also become a popular industry of our country's economic development. Paper industry is a high yield, water

More, serious pollution of light industry. Using oxygen bleaching is for the sake of environmental protection. VPSA oxygen plant pressure swing adsorption (psa) easy to operate, d

Simple, less investment, low operating cost, in a growing number of pulp domestic enterprises was introduced.

Keywords: oxygen bleaching psa oxygen generator VPSA environmental protection

Cardiac oxygen bleaching is clean production technology

Papermaking industry is one of the top ten pillar of national economy in the developed countries, and the development of China's paper industry into the fast

Speed growth, the paper has also become a popular industry of our country's economic development.

Paper industry is a large production and a lot of water, serious pollution of light industry; Among various kinds of industrial water pollution, the top

MAO; Waste gas, solid waste and noise pollution, but also very serious. The country will continue to paper making heavy emitters

Close move, stop, and turn, and, on the scale of production does not scatter, backward technology, economic management, serious pollution and pollution

Or standards of papermaking enterprises give fall into disuse. Paper mill's most polluted to calculate emissions of chlorine bleaching effluent, waste

Not only in the liquid contains COD and BOD, but also contains other toxic substances. With no chlorine bleaching (TCF) or less chlorine bleaching

(ECF) replaced by the new technology of pulp CEH three sections, the traditional way of bleached pulp is pulp and paper industry pollution to the environment

The clean production technology.

Oxygen bleaching become develop clean bleaching process of necessary process, using oxygen bleaching is for the sake of environmental protection. Because the oxygen free

Poison, itself has no pollution to the environment, after oxygen off lignin, the back of the bleach and bleaching waste water quantity can be reduced by 50%. In recent years,

At home and abroad, in view of the requirement of environmental protection, increasing interest in oxygen bleaching. The Swedish government put off lignin as oxygen

New bleaching pulp mill a measures of pollution control. Has been proved that oxygen bleaching can greatly reduce the BOD and COD in the bleaching effluent

Chromaticity and total content of organochlorine, it to reduce the pollution of modern pulp bleaching waste water plays an important role. Oxygen bleaching can also be

To save the consumption of other chemicals, compared with chlorine bleach bleached pulp, can increase the pulp yield. Oxygen bleaching waste

Fluid can be incorporated into the black liquor of alkali recovery system, into the alkali recovery system, or a sequence of section after the merger to general wastewater

Richard.

The application of cardiac domestic pulp enterprises oxygen generation equipment are studied

Domestic oxygen bleaching process by the 1990 s to a large number of applications. The initial oxygen source choice only small air separation

Cold equipments, advanced technological process for medium voltage crout with turbine expander cycle. Air from the air inhaled air compressor

Machine, is compressed to the required pressure, then through the last stage after cooler into freon, precooling unit is cooled to 5 ℃ or so

Enter the purification device, in which remove moisture, carbon dioxide, hydrocarbon and other substances, enter the fractionating column. After purification,

Compressed air into the fractionating column (on) the main heat exchanger, and the main heat exchanger (below) to the gas, oxygen, nitrogen and fractions of heat exchange

Change after the throttle valve with expander come out in the cold air meet below the bottom of the evaporator, the tower is heat transfer, mass transfer

Cheng. Air next tower preassigned, then on the throttle to further fractionation tower, at the top of the tower to get pure nitrogen, upper tower of the spare

Gas fractions after recovery of cold energy in heat exchanger as clarifier regeneration with blowing cold, products of pure nitrogen gas through the pipeline to the user. production

Oxygen in oxygen tube road after water seal device import storage airbag to oxygen compressor.

Small cryogenic air separation form a complete set of high pressure oxygen compressor and pump station as standard, high investment, high energy consumption and operation

Large amount of maintenance, typically over ten hours driving time, operation cycle 6 to 12 months. The greater the cryogenic equipment technology more advanced,

The lower the energy consumption, and mill scale is not large with oxygen. For pulp enterprises, for bleaching auxiliary equipment, cryogenic air separation

Equipment inconvenience, a running maintenance cost is high, the oxygen source selection is not ideal.

At present domestic largest cryogenic equipment for the pulp bleaching is sea, pulp paper industry co., LTD., hainan KDON (Ar) - 2770 /

3200/60 type air separation equipment, oxygen production 2770 nm3 / h, commissioning date in 2004. Choose the cryogenic equipment, except for years

The size of the produced 1 million tons of bleached pulp, the local gas market blank, there is a lot of demand for oxygen and nitrogen argon is the main reason.

China's legal system pressure swing adsorption (psa) oxygen research began in the early 1970 s, has realized the small pack until the early 1990 s

The industrialization of buy. Psa oxygen generating is the basic principle of using nitrogen and oxygen in the air on the zeolite molecular sieves (ZMS)

On the basis of different pressure and the difference of adsorption performance for separation of oxygen and nitrogen.

The initial PSA oxygen generator used for domestic pulp bleaching for small pressurized adsorption (PSA) type equipment in production

Below 100 Nm3 / h, power consumption and small cryogenic, about 0.9 ~ 1.3 KWh/Nm3, but technology is not mature, mostly

Experimental equipment. Yield and the purity can't long-term stability, performance and loading process is unqualified, molecular sieve in product gas

Powder, most of the equipment are not used or not so long, affects the oxygen bleaching in the promotion of domestic paper industry.

VPSA process is adopted widely in foreign advanced psa oxygen generation process. Domestic formal into the industrial application

Is in the late 1990 s, and quickly applied in the field of domestic paper pulp bleaching. The oxygen purity 93%, can fully meet the pulp

Bleaching process requirement, the energy consumption of 0.4 ~ 0.5 KWh/Nm3, with the low pressure large cryogenic air separation, as long as a few minutes of driving time

Clock, can open parking at any time, no matter in equipment investment, or in terms of operating costs, have very strong competitiveness.

Sfa paper co., LTD., is the domestic first forest paper integration of enterprises and domestic first using ECF four no

Elements in the production of chlorine bleaching pulping enterprises, the production of paper pulp with high whiteness, high cleanliness, green environmental protection, etc

Points. Adopt Finland AHLSTROM three oxygen pressure screen, lignin, C/D - E/O - four Duan Piao technology D1, D2, supporting

VPSAO - 360 type pressure swing adsorption oxygen generator, annual output of 100000 tons of bleached pulp.

Sichuan sinopac paper co., LTD. Has advanced without chlorine bleaching of pulp production line, the pulping capacity of 80000 tons, is the bamboo

Plasma devoid of chlorine bleaching, supporting VPSAO - 260 type pressure swing adsorption oxygen generator.

Xinjiang agency WeiYe co., LTD. 50000 tons of bleached reed pulp board technical renovation project has the most advanced grass pulp production

Process, lignin less chlorine bleaching and oxygen has been included in the national 863 plan, form a complete set of pressure swing adsorption oxygen generator for VPSAO - 210.

Is currently the largest used for pulp bleaching, of variable pressure absorbing oxygen generation equipment are shandong asia-pacific sen of 22 bo pulp paper co., LTD

Ten thousand tons of bleached sulphate wood pulp matching VPSAO - 700 type pressure swing adsorption oxygen generator.

At present domestic straw weight also is very big, but the oxygen bleaching in the application of straw or blank. Straw oxygen delignification,

Is technically feasible, economically is reasonable. Due to the paper straw lignin content, oxygen bleaching of wheat straw has more

Good selectivity, high viscosity pulp, the intensity is good, it is easier to implement than wood pulp TCF bleaching. According to the related research, USES the (XQ)

Pht, EApPht, ApPhtY, Ap (PO) and so on pulp bleaching sequence can be wheat straw this paste drift to more than 80% SBD whiteness, is to realize the Soda -

AQ wheat straw short high whiteness of TCF bleaching feasible bleaching processes. Use the factory existing streaming hypochlorous acid or alkali treatment tower

Salt bleaching tower, simply add a small amount of auxiliary equipment, can be implemented, to our country traditional bleaching process of transformation and reduce environmental pollution

Dye has important practical significance.

Introduction to cardiac oxygen bleaching with VPSA oxygen generation equipment are studied

VPSA oxygen generation system is mainly composed of blower, vacuum pump, switching valve, of adsorber and oxygen buffer tank. Raw materials by the suction air

After the inlet filter to remove dust particles, roots blower pressurization to 0.3 ~ 0.5 barg and into one of the adsorber.

Adsorber fill the adsorbent, including moisture, carbon dioxide, and small amounts of other gas composition are filling in at the entrance of adsorber

Activated alumina adsorption, at the bottom of the upper part of the nitrogen is then loaded on the activated alumina adsorption by zeolite molecular sieve. The oxygen

(including argon) for the adsorption components such as a product from the top of the adsorber the exit gas to oxygen buffer tank. When the adsorber

Attach to a certain extent, the adsorbent will reach saturated state, this time by switching valve using vacuum pump to vacuum

(and adsorption in the opposite direction), vacuum degree is 0.65 ~ 0.75 barg. Has the adsorption of moisture, carbon dioxide, nitrogen, and a few others

Gas composition is pumped to the atmosphere, side by side adsorbent regeneration.

 

Every adsorber VPSA alternately, perform the following steps: - adsorption - desorption - stamping. The above three basic work

Art step by PLC and switching valve system to realize automatic control.

 

VPSA oxygen generating device has the advantages of simple process, less equipment, less capital cost, the factory request is not high also, infrastructure costs only

Equipment 5 ~ 10% of total investment.

VPSA device can automatic running without load, and after parking, mood stable adsorption tower, driving back after a few minutes

Can the product. Simple can avoid the peak start-up and shutdown operation, reduce the production cost.

VPSA device itself is simple, less the number of operating machinery and equipment for the roots blower and roots vacuum pump, because of its

Work principle of positive displacement, no oil, operating under atmospheric pressure, less maintenance workload, low cost. Years driving device

Rate is about 98%, and 50% because the fault parking, such as cooling water supply failure and power failures. Equipment normal d

Repair maintenance stop about every five days, vacuum pump oil used in fan, moving equipment regular maintenance and operating personnel in charge of the air

Of non-woven filter replaced periodically (cycle for January and February), etc.

Molecular sieve the service life of more than 10 years, usually two or three years to replace the switch valve seat, vacuum pump bearing and oil seal

Under the condition of normal use life of three to five years.

Pulp enterprise's priority should be to the pulp yield and quality, as bleaching auxiliary equipment, oxygen generator, work

Stable and reliable which can ensure supply meet the technological requirements of oxygen is the key, and operation is convenient, simple maintenance,

Relatively less investment, lower operation cost. VPSA oxygen plant pressure swing adsorption (psa) just meet the requirement of various aspects, so at home

More and more pulp enterprises spread.

His is cheap applicable oxygen source VPSA oxygen generation equipment are studied

VPSA oxygen generating equipment technology mature, at present, the domestic two tower process level has and international synchronized, general energy consumption in the 0.4 to 0.5

KWh/Nm3, 91 ~ 94% purity, automatic control, oxygen unit cost 0.4 yuan (because of the electricity price difference), and

Oxygen unit price for the market at present about 1 yuan () by different near oxygen production and demand.

Cryogenic air separation is the sixth generation of the current domestic most advanced products, in addition to using the structured packing tower and argon both nuclear distillation system

Heart technology and application of high efficient internal compression process of liquid pressurization turbine expander, high pressure, large cross-section large size plate heat exchanger

And room temperature molecular sieve purification technology, such as air separation plant oxygen extraction rate reached 97%, 99%, argon extraction rate reached 75%, 88%,

Psa unit power consumption dropped to 0.40 0.42 kWh/m3. But automation control, stay in the mid - 80 - s level and the equipment

Production is in commonly 6000 nm3 / h above, the current domestic mill scale are not applicable.

Cryogenic equipment can produce oxygen and nitrogen commonly two kinds of products, pulp enterprises is nitrogen gas gap, and the dosage is not big, by its rules

Die, if sales, storage and transportation market competitiveness is not strong, most of them are empty waste. Oxygen production adjustment is more difficult,

Adjust the time to one hour, pump configuration platform, yield is not big, market economy.

Processing raw materials oxygen in the air and can not be extracted completely. PSA pressurized adsorption oxygen generator, air and materials

Pressure 0.4 MPa adsorption from oxygen, and then by atmospheric vent desorption. Characterized by low molecular sieve requirements, equipment is relatively simple, but

Energy consumption is higher. The general yield under 100 nm3 / h, more economy. Because of its higher export pressure, more application at present

Pure oxygen aeration in sewage, oxygen-enriched aquaculture and other fields.

At present domestic pulping enterprise scale in hundreds of cubic with oxygen, oxygen bleaching pulp pressure generally is 0.8 MPa. VPSA psa

Oxygen equipment, low-pressure adsorption oxygen generation, vacuum desorption, oxygen product according to customer's need to configure the pressurized oxygen compressor, send again

Household use, low energy consumption, pulping enterprise configuration is more economic.