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Wire rolling mill furnace control the transformation of evaporative cooling


, The scene outside the network operator by adjusting the air valve to adjust the master proud drum pressure pump by adjusting the steam control valve, control the main steam drum level. Evaporative cooling system shown in Figure 1. Figure l vent furnace outside the net evaporative cooling circulation system diagram of evaporative cooling system by regulating instrument display first switch, to control the electric pump, cooling system, the main drum to pay, for control reliability is not high, work noise and disabled . Since then, the scene has been adjusted by manual valves, main steam drum pressure and level control in a state of blind control, low precision and the operation frequently. 2.1 overall program for lower labor costs and save money in the end, the vaporization temperature control and heating control of the nature of the post merger of two monitors, the use of electric control valve on the main vaporization system for remote drum level and pressure control. At the same time in order to protect the reliability of the control, installation of Sheung Shui in the system temperature detection, the main steam drum level and pressure alarm facilities. 2.2 To increase the reliability of the reconstruction pipeline, piping and valves to retain the original and the original installation of the bypass pipe line the roadside, in the bypass road to install the electric control valve (see Figure 2). Electric control valve piping diagram of Figure 2 modified furnace evaporative cooling system is running, the original pipe valve closed, open the bypass road of the two auxiliary valves adjusted by adjusting the display meter bypass road electric control valves, control speed of the steam pump in Sheung Shui. Open the original valve, close the bypass pipe, can not affect the furnace evaporative cooling system under normal operation of the electric control valve for servicing. 2.3 Selection of control valve control valve selection related to the effect of the use of a system and project cost, in the selection through the following steps. 2.3.1 Select valve type and materials not wholly in May 2004 the second phase of the selection valve related to the effect of the use of a system and project cost, in the selection through the following steps. 2.3.1 Select valve type and materials by comparison, combined with site conditions, selection of a compact structure, small size, low cost, flow capacity, suitable for large flow of gas or electric with a body floating logistics butterfly. Flow of materials due to work requirements is the saturated water vapor, used to increase the corrosion resistance of cast steel valve,[link widoczny dla zalogowanych], the temperature of a 20 - 200 \Determined by the valve model ZIqWa a 6K. 2.3.2 determine the nominal diameter of the valve is used with the steam pump specification (2QS a 21/17), application of saturated steam flow capacity formula: C:-137.29Ms (where, P a valve before absolute pressure, MPa; M steam mass flow, kg / h; K ~ steam correction factor, taking 19.4.) calculated the maximum flow capacity required Cmax of about 30. Reference control valve selection and specification sheet flow capacity close to the Cmax of the control valve and pump for the future aging of the steam pipe or steam leak occurred the ability to set aside a certain situation to determine the valve nominal diameter DN 50. 2.3. 3 Checking valve opening control valve work, the general hope that the scope of its work in 10% to 90%, and in order to reduce the erosion of the fluid on the valve seat,[link widoczny dla zalogowanych], but also save money. Butterfly valve equal percentage flow characteristic is, in the normal state of piping for the series, the application of this state, checking the valve opening of the formula: K 1, a widely -------------- : [lg4s + (IOCZ, ~ P / Oizp) -1 +13 × 100% where: K a flow of Qi at the valve opening; C for a flow capacity; S of a control valve fully open the valve before and after the pressure and The ratio of the total system pressure ,0.3 - 0 .5; △ P a calculated pressure, kP; one was checking the flow at the opening, m / h; ID-medium density, / m3. Experience count, zwa__6K, DN50 scope of work to meet the electric butterfly valve opening requirements. 2.4 The control of the system, obtained through the differential pressure type water level gauge the main steam drum level signals,[link widoczny dla zalogowanych], respectively, and the furnace to adjust the computer monitor display instrument systems. Adjust the display by adjusting the level meter to control valve opening, to control the speed of the steam pump, Sheung Shui, purpose (see Figure 3). Figure 3 Schematic diagram of the main drum control pressure control outside the network through the air pipe proud to achieve the installation of electric control valves,[link widoczny dla zalogowanych], electric control valve selection above, the transformation process is similar, not repeat. 3 to be effective from September 2002 transformation is complete, heating evaporative cooling system to achieve the level and pressure of the remote control. The installation of the Sheung Shui temperature detection, the main steam drum level and pressure alarm facilities in good working order to ensure that the evaporative cooling system's reliability. The main detection signal sent to the vaporization system, heating system, industrial machine, to achieve a parallel monitoring. Received date :2004-03-04 Reviewer: Xing-yuan Editor: Wu root soil
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