1 feed pump control circuit problems

Feed pumps in our factory commissioning, misoperation occurred many times during the trial run, resulting in substantial fluctuations in the drum water level, and caused several downtime. After analysis, to determine the feed pump control circuit has the following problems.

(1) feed pump recirculation door switch control signal generated by an analog electronic circuit given place (see FIG. 1), which loop interference signal due to a multi-spot, easy error signal, and the signal itself is poor accuracy, but also to cause the pump Unstable operation.

Figure 1 before the recycle gate control loop

(2) There is no linkage circuit when the pump is dumped, resulting in the standby pump unable to be put into operation in time, resulting in exceeding of the important parameters such as drum water level and even causing the boiler to extinguish the fire.

(3) A total of 21 point temperature protection measuring points such as bearing temperature, stator coil temperature, lubricating oil temperature, working oil temperature and sealing water temperature of front pump, motor, coupling and main pump of feed pump, Access to decentralized control system, in which a point of poor contact, interference and other failures, will cause the feed pump to jump, but also become a major risk to safe operation.

2 to pump control circuit transformation

In response to the above problems, after careful study of the water pump control software, and understand the relevant functions of the WDPF system, made the following changes to the feed pump control circuit.

(1) The front pump flow signal into the decentralized control system, converted to digital, increase the high and low comparison algorithm, the corresponding switch recirculation door, eliminating the recirculation door switch signal unreliable hidden trouble. Revised after the loop control loop shown in Figure 2.

(2) increase the feed pump linkage signal, due to the cause of the pump itself caused by the jump pump hair linkage signal. Linkage conditions completed by the computer software, an increase of computer output points and a linkage relay, increase the linkage circuit shown in Figure 3.

Figure 3 increase the feed pump linkage loop

(3) For the accidental jump caused by the occasional open circuit of the thermal resistance of the feed water pump, we take a 5 s delay increase for each point of the temperature and filter out the high-temperature false signal caused by the interference signal, and increase the computer software. When the heat Resistance signal exceeds 500 ℃, judged as open, will not cause jump pump. The modified high temperature pump circuit shown in Figure 4.

Figure 4 modified high temperature pump circuit jump

3 Conclusion

After the above measures are gradually implemented, the phenomenon of wrong jumping of feed pump in our factory disappears. As a result of the correct action of the feed pump protection circuit, the safety hazard of our factory is eliminated. At the same time, in the reform of the control loop of the feed pump, we also have a profound understanding of the powerful functions and convenient modification of the WDPF-II decentralized control system, and deeply feel that the large-scale thermal power plant is designed with advanced DCS decentralized control system. Its hardware and software System and other aspects are more stable and reliable, and has considerable flexibility, which laid a good foundation for the reliable operation of the thermal protection.

Xinxiang Lifeierte Filter Co., Ltd is specialized in manufacturing filter elements, filter housing, filter equipment, testing equipment and hydraulic parts.She is located in Xinxiang that is the center of filtration in China.Xinxiang Lifeierte Filter Co., Ltd integrates with oil filtration, water treatment and air purification to provide the society with more professional service and meet customers` demands. What`s more, Lifeierte has top-notch R&D team, professional technical team, effective production network and perfect after-sales service system. The corporate philosophy of Lifeierte is [to purify environment, to serve society, to manage faithfully,and to pursue excellence". The company also established the comprehensive cooperative relations with some famous design & research institutions and colleges. The quality of the product has reached the international advanced level and makes us achieve remarkable economic benefits.

Products

Mainly including:

National standard filters and filter elements, replacement of abroad filters and filter elements, the hydraulic equipment like oil filter machines and filter series, the filter detective equipment;

Compressed air filters and filter elements, air cleaning filter drums and filter-bag series, various kinds of air cleaning facilities in different patterns;

Kinds of water treating equipment like stainless steel water filters and filter elements, full automatic backwashing filters.

We carry out ISO, DIN, IDF and 3A industry standard strictly during the manufacturing process and all the products can conform to the standards of GMP.

The endeavor makes us more professional. The performance and the effect of our replace products are comparable with imports; in addition the performance and the quality of domestically-made filters or filter elements are also stable and reliable. All those have been selected and recognized by customers and research institutions.

testing standards are satisfied by the products

ISO2941- filter elements- the testing for the cracking resistance

ISO2942- filter elements-the identifying for the structural integrity

ISO2943- filter elements-the identifying for the compatibility between material and the liquid

ISO3723- filter elements-the testing method for the end load of filter elements

ISO3724- filter elements-the identifying for the fatigue properties of the filter elements

ISO3968- filter elements-the testing for determination of pressure differential/flow characteristics

ISO4572- filter elements-the testing for the multi-pass method for evaluating filtration performance.

Multi-fold Filter

Multi-fold Filter,Water Treatment Multi-fold,Multi-fold Water Filtration,Multi Fold Filtration

Xinxiang Lifeierte Filter Corp.,Ltd , https://www.chinafiltrations.com