Case of technical transformation of multi-hole nozzle for steam drum water level

Abstract: The case information of the technical transformation of the multi-hole nozzle for the water level of the steam drum is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Based on the successful experience of multi-hole technology transformation of steam drum water level in No. 1 boiler of Huaneng Pingliang Power Generation Company, the principle of steam drum water level measurement and the method to improve the measurement accuracy are analyzed. The transformation does not need to open holes on the steam drum wall, so that the measurement of each water level gauge does not interfere with each other and reduces. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the technical transformation case article of the multi-hole nozzle of the steam drum water level. Based on the successful experience of multi-hole technology transformation of steam drum water level in No. 1 boiler of Huaneng Pingliang Power Generation Company, the principle of steam drum water level measurement and the method to improve the measurement accuracy are analyzed. The transformation does not need to open holes on the steam drum wall, so that the water level gauges do not interfere with each other, reduce the measurement deviation, and improve the reliability of the water level protection and control of the steam drum. 1. Configuration of the drum water level gauge (figure 1). One set of on-site two-color water level gauges are provided on each side of the steam drum A and B, which are sent to the centralized control room for monitoring by the water level television monitoring device (TV). Side B is equipped with a set of electric contact water level gauge independent of DCS power supply, and the signal is sent to the centralized control room for monitoring and alarming. Each of the 3 sets of water level differential pressure transmitter outputs (4~20) mA signal to the DCS, which is used for the monitoring and automatic adjustment and control of the water level of the steam drum after the logical judgment of the three. The signals of the 3 sets of water level differential pressure transmitters are judged by logic of taking two of three high and low. The signals of the 3 sets of water level differential pressure transmitters are judged by logic of taking two of three high and low. Boiler trip protection is realized as the MFT condition of the drum water level. In the original design, side B on-site two-color water level gauge and electric contact water level gauge share a pair of measuring holes. 2. Existing problems From the configuration in Figure 1, it can be seen that when all 6 sets of water level gauges are normal, they can fully meet the requirements of operation and protection, but when one set of water level gauges fails, especially one set of water level gauges on the B side of the steam drum fails When the accuracy of the water level measurement will be affected, the reliability of the protection control will be affected. For example, when the on-site two-color water level gauge on the second side of the steam drum bursts, since the two-color water level gauge and the electric contact water level gauge share a pair of measurement sampling holes and a primary door, the two-color water level gauge must be isolated at the same time as the electric contact water level gauge. Only 4 sets of drum water level gauges are left in operation. For another example, the primary door and the secondary door must be isolated after the leakage of one differential pressure transmitter on the B side of the steam drum. At this time, the two differential pressure transmitters on the B side of the steam drum must be out of operation at the same time, and only the A side 1 differential pressure transmitter must be out of operation at the same time, only 1 differential pressure transmitter on side A participates in water level protection and adjustment control, and the safe operation of the crisis group. Although this configuration of the drum water level gauge meets the requirements in terms of quantity and measurement types, the independence of the measuring holes and the existence of mutual influence violates the literature that each water level measuring device should have an independent sampling hole, and shall not be used in the Multiple water level measuring devices are connected in parallel on the same sampling hole to avoid mutual influence and reduce the requirement of water level measurement reliability. Since the operation of Huaneng Pingliang Power Generation Company in October 2000, due to the unbalanced subsidence of the boiler steel frame, the horizontal plane of the steam drum is an inclined plane from the position of the center line of the steam drum, so the center line of the steam drum and the reference should be re-measured. The height of the water column can be determined, modified in the DCS logic algorithm to improve the accuracy of the measurement. 3. Feasibility analysis and modeling of reconstruction The boiler steam drum is an ultra-thick and large-scale high-pressure vessel. The calculation of the increased hole strength on it must be accurate. The process requirements are strict, and the construction process and local heat treatment are slightly negligent, which will leave potential safety hazards. . In addition, the number of additional holes is limited by the bearing strength of the steam drum. After investigation and comparison, it is proposed to adopt the multi-side hole takeover technology for the water level of the steam drum produced by Qinhuangdao Huadian measurement and control equipment. The technology is to use the original larger measurement sampling hole of the steam drum to take over the channel (d51mm×10mm), intubate into the steam drum for sampling, and add an independent measurement sampling hole to the takeover. The increased measurement sampling hole has a certain distance from the original sampling hole, and is equipped with a steady flow sampler. In this way, new measurement sampling holes are added without the need to re-open the drum wall. The newly added measuring holes on the multi-hole nozzle can meet the sampling requirements of the measuring device without affecting the sampling requirements of the original water level measuring device. Fourth, technical transformation 4.1 Sampling transformation of differential pressure transmitter (1) Remove the original steam drum water level measurement balance container and related sampling pipe valves, and smooth the cut sampling pipe after removal to meet the requirements of metal welding. (2) In the original measurement sampling hole (d51mm×10mm), insert d28mm×4mm 20G steel pipe, the inserted steel pipe is at least 10cm longer than the original measurement sampling hole to avoid mutual influence. After the sampling pipe is drawn out of the steam drum wall, it passes through the reducing and high-pressure shut-off valve, and is welded with two balance containers respectively to form an independent sampling pipeline.

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