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CHTA Type Feed Pump
 
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The CHTA feed pump for high pressure boiler is a split type segmental multistage centrifugal pump:

● The pump body and pump cover are forged by quality carbon steel, and the austenitic stainless steel is pile up welded on both the sealing face and the erosion part (partially welded for F type Wilden pump), thus increasing the service life and the reliability of the pump. The service life of the CHTA pump is 40 years.

● The pump core, made of stainless steel, can be used as spare part as a whole, and capable of being replaced in a short time.

● All stages of impellers can be hot charged to the shaft and positioned by the clamping rings of each stages to prevent the axial force applies to the shaft sleeve after being stacked.

● The pump adopts the structure of dual balancing drum which is capable of balancing 100% of the axial force in normal conditions; and both the residual axial force generated during the startup and shutdown process and the axial force generated due to the change of working conditions are burdened by a double-thrust bearing.

● The bearing adopts the four edge radial bearing and Mitchell thrust bearing which eliminate the need for block scraping and have good lubricating performance and interchangeability; no top petrol tank or DC oil pump is necessary in case of accident and idle pump operation.

● The shaft gland adopts mechanical seal, which has good sealing performance, small leakage rate, thus being safe and reliable.

Features:

Introduction to characteristics of the CHTA feed pump for high pressure boiler


The CHTA feed pump for high pressure boiler is a product manufactured by introducing technologies from the KSB company in Germany in 1980s to support the supercritical and subcritical thermal power generating units (completely introducing the manufacturing technique of the feed pump for high pressure boiler and booster pump as well as the complete set of standards and QC specifications, etc.) So far, we have produced over 400 sets, wherein, over 300 sets are in service, and the 50CHTA feed pump for high pressure boiler is awarded the Gold Medal of the State. The CHTA feed pump has been praised as one of the best two kinds of equipments among all the equipments of Harbin No.3 Power Plant who uses the first localized 600000 KW generating units. The CHTA feed pump has the following characteristics:
Model: The CHTA feed pump for high pressure boiler is a cylindrical (dual-casing) multistage segmental centrifugal pump

  1. Long service life and high reliability: Both the pump body and the pump cover are forged by quality carbon steel, and the austenitic stainless steel is pile up welded on both the sealing face and the erosion part (partially welded for F type Wilden pump), thus increasing the service life and the reliability of the pump. The service life of the CHTA pump is 40 years.
  2. Short troubleshooting time: The pump core is made of stainless steel, capable of being used as spare part as a whole and being replaced in a short time.
  3. Impeller hot charging and single-stage positioning: All stages of impellers can be hot charged to the shaft and positioned by the clamping rings of each stages to reduce the accumulated error and prevent the axial force applies to the shaft sleeve after being stacked.
  4. Safe and reliable balancing mechanism: The pump adopts the structure of dual balancing drum which is capable of balancing 95% of the axial force; and the balancing mechanism of the dual balancing drum has the function of automatic resetting the rotor. therefore, it eliminates the disadvantage that the balancing force produced by the single balancing drum structure of the Wilden pump is so large in a single direction that the thrust block is burnt, thus improving the reliability of the thrust bearing in a non-designed working conditions. At the same time, it eliminates the shortage of unstable shafting of the single balancing disc. Both the residual axial force and the additional axial force generated due to the change of working condition are burdened by the double-thrust bearing.
  5. Four edge bearing: The four edge radial bearing and Mitchell thrust bearing are machined in a single process, which eliminates the need for block scraping and have good lubricating performance, contacting performance and interchangeability; no top petrol tank or DC oil pump is necessary in case of accident and idle pump operation.
  6. Dynaflow type mechanical sealing: The shaft gland adopts the HSH dynaflow type mechanical sealing based on the BURGMANN technique, featuring good sealing performance, small leakage rate, self-circulating flush, no external water supplies are needed, thus being safe and reliable.

Rigid Rotor:

The pump has fewer stages, and the rotor’s primary critical rotation rate is over 150% of the maximum operating rotation rate, thus being a rigid rotor. The pump can be subject to a short time of cavitation. To compare only the rigidities of the 50CHTA/6 with the FK6D32 pump: the FK6D32 pump has a larger and heavier impeller the 50CHTA/6 pump (FK6D32 pump has an outside diameter of Φ320 while the 50CHTA/6 pump, only Φ284); to calculate with the formula of rigidity coefficient, i.e. K=(L1.5*W0.5)/D2 (here, L: the distance to bearing center, W: weight of rotor between bearings, D: mean shaft diameter between bearings), the rigidity of the 50CHTA/6 pump is better than that of the FK6D32 pump. In addition, to calculate with the empirical formula of the rotor’s rigidity, i.e. D’=D0/D2(D0: shaft diameter at impeller, D2: outside diameter of impeller), the D’ is 0.37 for 50CHTA/6 pump, and 0.359 for FK6D32 pump, therefore, the rigidity of the 50CHTA/6 pump is better than that of the FK6D32 pump.

The shaft is made of patented materials, with excellent fatigue resistance

  1. High efficiency and significant power-saving effect: due to the application of excellent hydraulic model and the dual balancing drum structure (volumetric efficiency improved), the pump efficiency is improved to a larger extent, the thermal state efficiency reaching 84%. Generally, the pump of the same grade has an efficiency of 1-2% higher than the Wilden pump. To calculate with 300MW full capacity pump as example, the pump parameters when loaded: Q=550m3/h,H=2200m,η=84(ρ=893kg/m3),power saved per hour by each pump: N=〔(550/3600)*2200*(0.84-0.82)*9.81*893〕/0.84*0.82=85.5kw,(remarks: ρ=893kg/m3,the efficiency of Wilden pump is 0.82.)One pump can save 683959kw of electricity a year (calculating by 8000 hours).
  2. Thermal compensation design: Solve the unsynchronized inflation due to the temperature difference between the pump housing and the pump core by using winding mat and metal shock insulator. This eliminates the problem that it is difficult to guarantee the hot treatment of the circular disc spring and the machining process, thus causing cracking accident during the operation of the pump (such structure has been eliminated by foreign manufacturers long ago).
  3. Patented materials: Major elements such as the pump shaft, impeller, sealing ring, balancing mechanism, etc. are made of patented materials. Especially the impeller’s sealing ring and the balancing mechanism’s removable/stationary wearing parts are made of the patented anti-gearing materials, and the pump shaft, made of patented anti-fatigue materials. Proven by the operation of nearly 300 pumps in the power plant, these materials achieve better result.
  4. Complete pump unit equipment and high automaticity: Besides equipping temperature protective devices for bearing, sealing, etc., the axial force measuring device and axial position indicator are designed to monitor the variation of axial force and the shaft shifting during the pump operation, and reversal alarming device (close the motor-driven door and start the auxiliary oil pump) and the speed measuring generator (unavailable for Wilden pump) are also equipped.

Low Speed Barring:

The improved CHTA feed pump is suitable for the homemade donkey engines’ 10-100r/min low speed barrings.

   
 

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