Author: Han two Panther, The Case Summary: This paper to lbhf electric actuator solution using the example of a petrochemical company, introduces the principle of special electro-hydraulic valve actuator and the main structure and its application in heavy oil catalytic cracking unit. In the light of the actual situation, this paper analyzes the troubles occurred in the double-acting double-acting slide valve in recent times and summarizes the judgment and processing methods of the common failures of the electro-hydraulic actuators. At the same time, special safety valve and its electro-hydraulic actuator made some suggestions. Due to its ability to convert heavy fuel oil, which is burned as a fuel, into high quality light oil and liquid hydrocarbons, heavy oil catalytic converters have received great attention for its good economic benefits. However, the catalytic cracking unit has high reaction temperature, fast reaction rate and large processing capacity, so some special equipment with higher safety factor is needed for its service. Among them, the special valve electro-hydraulic actuator system is one of the major equipment. It directly controls the reaction temperature and reaction pressure, and can promptly and promptly terminate the reaction in the fault state, cut off three machines cycle, protect the device, protect the unit. Therefore, the catalyst device can be opened, the key is the special valve and its electro-hydraulic actuator is well used. 1 catalytic fcc reaction regeneration system introduced a petrochemical company heavy oil catalytic converter in May 2003 transformed into double riser reactor, the process shown in Figure 1. Figure 1 Recycling part of the flow chart Heavy oil (one for the atmospheric residue, two for the fractionation slurry) in promoting the promotion of steam, mixed with the catalyst to reach a certain temperature, after the reaction in the riser into the settler. Settle the oil and gas and solid particles separated, sent to the fractionation tower for separation of oil and gas, solid particles into one or two and then charred recovery. Repeated flue gas sent to the hood to do work, two flue gas sent to the remaining furnace for combustion. The process involves many special valves, such as one, two and then double-action slide valve, to be valve, then valve, take the hot slide valve. From the above description is not difficult to see that the electro-hydraulic actuator directly used to control the reaction part of the regeneration temperature, pressure and level, plays a crucial role in the production. However, due to the special valve electro-hydraulic actuator is more complex, more seals, high operating pressure, often in the course of operation failure. Once these electro-hydraulic valve failure, ranging from the reaction regeneration part of the fluidized disorders, affecting product quality, weight is caused by the system interlocking self-protection, cut off the main wind, feed and three-cycle, resulting in a complete shutdown device. Therefore, in order to minimize the failure rate of the special valve and reduce the unscheduled downtime, this article combines the actual situation of a petrochemical company, introduces the working principle and the main structure of the special valve electro-hydraulic actuator, Status and common faults were analyzed and summarized, with a view to the long-term operation of the installation of the company's work to help. 2 electro-hydraulic actuator to a petrochemical company lbhf electro-hydraulic actuator as an example to introduce. lbhf electro-hydraulic actuator and fcc device is a single, double-acting slide valve supporting the use of a new type of actuator, which is a standard 4 ~ 20madc to accept the input signal through the servo amplifier, high-precision linear displacement sensor, electro-hydraulic servo valve servo cylinder Driven valve plate reciprocating motion, in order to achieve the slide valve switch and displacement adjustment control, compared with the pneumatic actuator, the electro-hydraulic actuator with high precision adjustment, output torque, fast travel, fast response, smooth operation, no Lag, no oscillation, no noise and high reliability of the work. Figure 2 Electro-hydraulic actuator system control block diagram shown in Figure 2, the actuator [1] [2] displacement control system is composed of electrical control system, electro-hydraulic servo valve, servo cylinder, hydraulic cylinder and displacement sensor, etc. Typical electrohydraulic position servo control system. The electrical control system compares the input signal with the feedback signal, compares and amplifies the deviation signal, outputs a control current with a certain function relationship with the deviation signal, and drives the servo valve into the torque motor coil of the electro-hydraulic servo valve ; Electro-hydraulic servo valve is electro-hydraulic conversion, hydraulic amplification flow control components; servo cylinder is the implementation of components; spool valve is the control object; displacement sensor is the feedback measurement components; hydraulic oil source is the power part of the system. The following mainly to catalyze the double again double action slide valve several accidents as an example to carry on the breakdown analysis, and proposed the solution. 3 Company double and double action slide valve failure and treatment 3.1 Accident Records 1) October 27, 2003 to 28, double-acting double-slide valve south of the valve suddenly one-way quick turn off the small, causing two re-pressure fluctuations to Operation brings difficulties, then changed to live hand operation. 2) At 11:14:00 on December 16, 2003, the valve on the south side of the double-acting double-acting slide valve was suddenly closed in the one-way direction without fault lock (scene phenomenon). The process operator immediately switched the valve from automatic to manual operating. Subsequently, the north valve control room manually adjust the south valve hand operation. 3) On January 21, 2004, at 9:52:00 AM, the valve on the south side of the double-acting double-acting slide valve was shut off one-way and no fault lock was found (on-site phenomenon), resulting in two more overpressures. Sudden increase of chimney runner Large, the South staff will change the valve on hand to control the scene on the north side of the valve to dcs manual control. 3.2 Comprehensive Failure Analysis and Treatment 3 ~ 4 The same phenomenon occurred in 3 times in just 3 months, which has a great impact on the safe and stable production of the device. The first fault is inspected due to displacement sensor fault, replacement troubleshooting. The third and the first fault the same reason, or due to displacement sensor fault. Strange is the second fault, post-test are normal, test cast is also normal. However, taking into account the cause of the malfunction was not found, the southern valve or on-site hand operation. Below we combine the historical graph (Figure 3, Figure 4) and the echographic record data (Table 1), analyze the real cause of the second fault. 16th inspection displacement sensor input and output lines, power line resistance 19.8mw, input line resistance 19.7kw, voltage 8.7v, are normal. On the 17th check the terminals, try to vote running valve oscillation, the result was found to be caused by walkie-talkie, turn off the walkie-talkie, the valve work smoothly, still valve cut to the scene hand, the opening of 50%, the operator with the North Side dcs manual remote control to adjust the second pressure. 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