Cold storage industry system needs to be rectified

Analysis of the cold storage industry system needs to be rectified From the perspective of the market demand for cold storage, China's existing cold storage capacity is still very insufficient. There are 22 million tons of cold storage in the United States, nearly 3.3 billion cubic feet, and the price of cold storage. At present, China has 9 million tons of cold storage, while China's raw teeth are five times that of the United States. China's future cold storage demand is very large.
However, the cold storage is a large energy consumer. Rarely stated: For every 0.1? increase in the oil film in the evaporator, the evaporation temperature will drop by 2.5 °C, and the power consumption will increase by 11%. If there is oil film, scale or frost on the surface of the evaporator, the evaporation temperature will decrease and the power consumption will increase.
In addition, when the compression ratio is less than 8 after the freezing of the low temperature library or the quick freezing assembly, the single stage refrigeration compression should be adopted first. When the evaporation pressure is lowered, the compression ratio is greater than 8 and then the two-stage compression refrigeration method is used, and many low temperatures are used. When the cold storage is started, the two-stage compacting machine is enabled to increase the energy consumption of the cold storage.
China's completely independent cold chain system has not yet formed, and the level of marketization is very low. The premise of frozen and refrigerated enterprises can be reformed into the middle of distribution of chain supermarkets, forming a joint operation mode of refrigeration and refrigeration enterprises, supermarkets and chain enterprises. Establish a food refrigeration supply chain, and purchase, process, store, transport, and sell perishable and fresh food from the production area until all the parts of the consumer are in a low temperature condition to ensure the quality of the food and reduce the need for food. Loss, cold storage construction, to prevent food deterioration and pollution.

It is believed that the cold storage industry must strengthen the overall planning and reconciliation under the same harmony of relevant parts, and vigorously develop the construction of the cold chain logistics system. At the same time, it is necessary to prevent blind and repeated cultivation to ensure the continuous healthy and stable growth of China's frozen and cold hiding industry.


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Table of classification of formation hardness and bit selection

Table of classification of formation hardness and bit selection
Roller Cone Bit IADC code	IADC code of diamond bit	Formation description	Rock type	Compressive strength(Mpa)	ROP(m/h)
111/124	M/S112~M/S223	Very soft:sticky soft formation with low compressive strength.	Clay Siltstone sandstone	<25	>20
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PDC bit shank thread and recommended make up torque
Bit size(in)	API regular pin(in)	Recommended up torque(KN.M)
3 1/2~4 1/2	2 3/8 Reg	2.4~2.7
4 17/32~5	2 7/8 Reg	4.2~4.6
5 1/32~7 7/8	3 1/2 Reg	7.1~7.7
7 13/32~9 3/8	4 1/2 Reg	17.0~18.6
9 13/32~14 1/2	6 5/8 Reg	50.3~57.5
14 9/16~18 1/2	7 5/8 Reg	65.5~71.9

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