Dust recovery rate of 92% Recovering more than 1 ton of urea every day Zhisheng company granulation tower “caps coveredâ€
Float valve is one of the tray structures widely used in China at present. It has outstanding excellent performance, and its main characteristics are: Strip Guide Float Valve,Stainless Steel Float Valves,Acid Resistant Steel Float Valve,Strip Guided Float Valve Kit Yangzhou Tongyang Chemical Equipment Co., Ltd. , https://www.tongyangchemic.com
Zhisheng's ammonium bicarbonate production to urea project was put into operation in 1996, and it is a small-scale chemical fertilizer reform project during the national "8th Five-Year Plan" period. The urea prilling tower was originally designed for a set capacity of 60,000 tons and 60,000 tons for a total of 120,000 tons. With continuous technological changes, the company's annual urea production capacity has increased to over 200,000 tons today. Due to the relative lack of height and space of the prilling tower, the natural cooling of the fused urea is affected, and the urea compaction is easily caused and the product quality is affected. The company has adopted measures such as the installation of cooling fluidized bed and circulating fluidized bed at the bottom of the packaging process and the granulation tower. Although the urea staking problem may be solved, it also leads to environmental problems such as excessive urea powder emissions.
In order to fundamentally solve the bottleneck imposed on the production of the prilling tower, at the end of April this year, the company combined an annual overhaul and invested 720,000 yuan to install atomizing nozzles, flushing nozzles and circulation on top of a 76-meter-high urea prilling tower. The pump, and stainless steel panels around a 4 meters high, nearly 20 meters in circumference, the shape of a dust cap tower. In the production process, the dedusting tower uses urea analytical waste liquid to wash urea dust, and all the washing liquid is recycled for the system to recycle, solving the problem of recovery of urea analytical waste liquid and urea powder, and achieving a good effect of reducing pollution and increasing efficiency.
It is understood that there are currently 120 small urea enterprises in the country. In existing small urea enterprises, urea prilling towers are generally configured with a diameter of 12 meters and a height of 64 meters. Many companies have increased their production capacity in continuous technological transformation but have not reconstructed the prilling tower. The reconstitution of a prilling tower that matches the production capacity requires continuous operation for 100 days, with an investment of about 6 million yuan. The dust-removal of “caps†on the top of the prilling tower saves money and saves time. The implementation of this transformation, Zhisheng company is the first in a small urea company.
â‘´ Large operating flexibility
As the valve plate can rise and fall freely, it can adapt to the change of air volume from big to small, and the air gap speed is almost constant. It can also maintain high separation efficiency in a wide operating range with frequent load changes.
⑵ High separation efficiency
In practical application, the tray efficiency can reach 60~70%, 10~15 higher than that of bubble cap tray, and it is still very high at low load. Due to the high efficiency, the product quality is improved accordingly.
(3) Large processing capacity
Because the arrangement of float valves is much more compact than that of bubble cap tower, the opening rate is increased. In addition, the air flow blows into the liquid level in the horizontal direction, so the entrainment of foam is low, which can improve the air flow and increase the production capacity. The production capacity is 20~40% higher than that of bubble cap tower.
(4) Pressure drop is small
The air flow through the float valve shrinks, expands and turns only once, and the pressure drop is lower than that of the bubble cap tray. The pressure drop of each tray in the atmospheric tower is only 3-5 mm Hg.
In addition, it has simple structure and low cost; Long service life, no fear of dirty materials; Convenient installation and use.
Performance characteristics of float valve tray:
(1) The processing capacity is smaller than tongue type, sieve plate, and larger than bubble cap tray;
(2) Large operational flexibility;
(3) The pressure drop of the dry plate is larger than that of the tongue type, the sieve plate tray is larger, the pressure drop is smaller than that of the bubble cap tray, and the liquid level gradient on the tray is smaller;
(4) The entrainment of fog is small;
(5) Simple structure and convenient installation.