In the past, the nitrogen fertilizer company waste boiler (waste heat boiler) with many accidents, difficult materials selection, and high cost has been replaced by new generations of upgraded technologies. Nitrogen heat production and high-temperature reaction heat can be used efficiently and safely. On October 18th, the horizontal triple casing high-temperature waste heat recovery device independently developed by Nanjing Guochang Chemical Technology Co., Ltd. passed the expert appraisal organized by the China Petroleum and Chemical Industry Federation in Beijing. The user of the technology, Li Xuchu, the deputy general manager of the Sichuan Chemical Industry Group, revealed: “Russian customers went to the company recently to seek technical cooperation, saying that our technology is more advanced than theirs for 20 years!â€
Experts from the Chemical Industry Industry Productivity Promotion Center and other experts from the appraisal committee evaluated the device as ingenious. It adopts the patented triple-casing technology consisting of an inner tube, a heat insulation tube, and an outer tube to make full use of the high-temperature reaction heat of the ammonia plant above 400° C., and at the same time resolves the conventional equipment because it needs to withstand both high pressure and high temperature. The problems caused by the high accidents and material selection requirements are too high. They have surpassed similar foreign devices and reached the international advanced level.
The highlight of this technological innovation with independent intellectual property rights is shown in the following: The triple-sheath structure makes the high-temperature tube sheet hardly bear the pressure, while the high-pressure tube sheet has the dual protection of the low-temperature process gas and the heat insulation tube and can operate at a lower temperature. Therefore, the problem of tube plate design that originally required to withstand high temperatures and high pressures has been solved. The high-temperature direct-connected tower pot integration, triple-tube boiler tubes, high-pressure headers and high-temperature headers developed and designed by Nanjing Guochang have reduced the difficulty of material selection and manufacturing difficulty, saving investment and high heat transfer efficiency of the device. And heat transfer stability.
The technology has been operating stably for 3 years on the 180,000 tons/year synthetic ammonia system of Sichuan Jinxiang Chemical Industry Group, achieving good economic and social benefits. The results of the 72-hour on-site assessment conducted by the recently completed expert group showed that under the condition of an intake temperature of 385°C, the amount of steam produced per ton of ammonia is 0.924 t/t ammonia; the normal design conditions for the intake air temperature of the process gas to reach 430°C. Under the tons of ammonia production steam can reach 1.1t/t ammonia (3.85MPa). Compared with traditional equipment, this technology improves the grade of by-product steam and the amount of steam produced per ton of ammonia, reduces system resistance and reduces heat loss. This simple and scientific device replaces the complicated and huge high-temperature high-pressure alloy pipe, which reduces the construction difficulty and greatly enhances the safety and stability of operation.
According to the person in charge of Nanjing Guochang, the new technology has been successfully applied to more than 20 nitrogenous fertilizer companies so far. The largest scale is the 350,000-ton ammonia ammonia plant of Luxi Chemical Group, which was put into operation last month.
Percussion Drilling Rig
Percussion drilling is employed when auger or wash boring is not possible in very stiff soil or rock. It also can be used in most soil types.
Here the advancement of a hole is achieved by alternatively lifting and dropping a heavy cutting or hammering bit that is attached to a rope or cable that is lowered into an open hole or inside a temporary casing (casings are hollow cylindrical pipes used for borehole stability and to prevent the loss of drilling fluid through the boreholes).
Usually a tripod is used to support the cable. The stroke of bit varies according to the ground condition. The major disadvantage of this method is that it is not possible to get good-quality undisturbed samples. In very hard rock (and especially fractured hard rock), down-the-hole (DTH) drilling can be employed. In this case the hammer, applying repeated percussive pressure, is located just behind the drill bit inside the hole, unlike the open percussion drilling, where the hammer is on top of the drilling string.
The drilling string provides the necessary force and rotation to the hammer and bit, as well as compressed air or fluids to the hammer and for the flushing of cuttings.
This arrangement also allows for much deeper percussion drilling. However, the DTH drills are typically more expensive.
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Henan YK Prospecting Machinery Co., Ltd , https://www.yikyuirig.com