7 results about "Cooling temperature" patented technology

The invention relates to a high-strength pipeline steel which comprises the following chemical components by weight percent: 0.01-0.12 % of C, 1.0-2.5 % of Mn, less than or equal to 0.6 % of Si, less than or equal to 0.0030 % of S, less than or equal to 0.015 % of P, 0.01-0.09 % of Nb, 0.0025-0.030 % of Ti, less than or equal to 0.08 % of Alt, less than or equal to 1.0 % of Mo, less than or equal to 1.2 % of Cu, less than or equal to 1.5 % of Ni, less than or equal to 1.2 % of Cr, less than or equal to 0.0030 % of B, less than or equal to 0.01 % of Ca, 0.001-0.010 % of N, and the balance being iron and unavoidable impurities. The steel is polygonal ferrite and bainite duplex structure. A manufacture method of the high-strength steel pipe comprises heating slab with a temperature of 1100 to 1250 DEG C, rolling a non-recrystallization region with a starting temperature of 750 to 920 DEG C and a terminating temperature of 720 to 840 DEG C, two-stage cooling under control with an ACC terminating cooling temperature of 200 to 580 DEG C and a cooling rate of 5 to 30 DEG C per second, and manufacturing the pipe by using a UOE technology with a compression rate of 0.1 to 0.5 % and a diameter-expanding rate of 0.5 to 1.5 %. The obtained steel pipe can meet demands of low yield ratio and high uniform elongation.

The invention relates to an intelligent electricity-saving control method for cooling towers in a central air-conditioner monitoring system. The intelligent electricity-saving control method is designed to solving the technical problem that in existing central air-conditioner monitoring systems, design of intelligent electricity-saving control methods for cooling towers is in lack of convenience. The intelligent electricity-saving control method is mainly characterized in that a temperature sensor on a pipe arranged between a cooling pump and a cooling water inlet valve of a refrigeration main machine is a cooling water returning temperature sensor; the cooling water returning temperature sensor is connected with temperature sensors at three positions, namely the temperature sensor arranged at the cooling water outlet position of water outlet of the refrigeration main machine, the temperature sensor arranged at the position where a cooling temperature difference of water inlet of the refrigeration main machine is generated and the temperature sensor arranged at the position where a cooling temperature difference of water outlet of the cooling pump is generated; two modes, namely the automatic mode and the intelligent modes, are arranged for the cooling water returning temperature sensor, and thus in the specific operation process of a central air-conditioner, by means of an intelligent algorithm in which the cooling towers are cut away, manual control over the number of the cooling towers is achieved; and by means of a touch screen end of cooling tower equipment, real-time monitoring is conducted, a real-time online sorting algorithm is adopted for operation time of the cooling towers, a time balanced control strategy is guaranteed, and for each time, the cooling tower which runs for the longest time is started and the tooling tower which runs for the shortest time is switched off.