Recently, the reporter learned from the National Development and Reform Commission that in order to ensure the need for spring fertilizer production this year, the National Development and Reform Commission and the Ministry of Finance in November 2005 had already extended the new year's storage qualifications for the 27 successful bidders that completed the chemical fertilizer destocking task in the previous year. These 27 companies have signed contracts with the National Development and Reform Commission and the Ministry of Finance for the first batch of fertilizer off-season commercial reserve contracts for 2005/2006, with a total volume of 6.05 million tons. The relevant companies have already started the reserve of lighter reserves of chemical fertilizers. It is reported that the second batch of fertilizer off-season commercial reserve work this year is still in the form of tender, for all fertilizer production and distribution companies in the country. Fertilizer production and distribution companies that have the qualifications required by the bidding documents can participate in the bidding, and they can also form a joint bid.
It is understood that in order to solve the contradiction between annual production and seasonal use of chemical fertilizers, the government has established a commercial off-season commercial reserve system since 2005, that is, after entering the off-season application of chemical fertilizers, some circulation companies will be selected through bidding to undertake the task of off-season commercial reserve. The company's off-season production of chemical fertilizers will be collected and stored. The state will subsidize interest on off-season reserves and deposit them on the market when spring season is used to enter the peak season. On November 1, 2005, the National Development and Reform Commission and the Ministry of Finance jointly issued the Supplementary Provisions on the Administrative Measures for the Reserves of Chemical Fertilizers in the Off-season. The "Supplementary Regulations" pointed out that the light-storage period is 6 months, and a method of bidding once for the storage enterprises and storage tasks, a three-year stability, and a method of awarding merits and demerits.
Shell and Plate Heat Exchanger
A shell and Plate Heat Exchanger is typical heat exchanger consists of a series of stacked plates and enclosed in a container shell. The plates are arranged in a chevron pattern, with each plate having its own inlet and outlet ports. Heat is transferred between the two fluids as they flow through the plates and shell respectively.
Shell and plate heat exchangers are used in particularly industrial plant. They are those require larger surface area and higher heat transfer coefficient, while at the same time, of high temperature and pressure.
In addition to their efficiency and compact size, shell and plate heat exchangers are also flexible in terms of material selection. Constructing material could be carbon steel, AISI 304, AISI 316L, AISI 904L, 254 SMO, Ti, Hastelloy, and more based on various operations.
Features of shell and plate heat exchanger are:
Gasket free
Stable and safe structure
Special seal structure for preventing media by-pass
High heat transfer efficiency
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