overall heat transfer coefficient of thermal oil heaters


  • Production capacity: 35-75 t/h
  • Work pressure: 1.25-5.3 MPA
  • Applicable fuel: Bituminous coal, anthracite, meagre coal, lignite, gangue, waste, sludge
  • Applicable industry: Chemical, food, tobacco, textile, printing and dyeing, feed, medicine, building material, wine, rubber, hospital

Product introduction

  As a new mature high-efficiency and low-pollution clean coal technology, circulating fluidized bed combustion (CFBC) technology has many advantages that other combustion methods do not have. Circulating fluidized bed combustion is low-temperature combustion, so the NOx emission is much lower than that of pulverized coal furnace, only 200ppm. CFBC can desulfurize directly during the combustion process, and the desulfurization efficiency is high. The technology and equipment are simple and economic, and the costs of its initial investment and operation are much lower than those of dry pulverized coal furnace and flue gas desulfurization (PC+FCD). The discharged ash residue has good activity and is easy to be comprehensive utilized without secondary ash residue pollution. The load adjustment range is large, and the low load can be reduced to about 30% of the full load.

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High temperature cyclone separator
  • High efficiency, wear resistance, separation efficiency ≥ 98%, effectively improve the combustion efficiency of the boiler thermal efficiency.

Large furnace design
  • Large furnace, low velocity design; the application of wearproof tube technology, reducing erosive abrasion.

  • Extend the residence time of coal particles in the furnace so that the coal can be fully burned.

Bell jar type hood
  • Adopt bell type hood to distribute air averagely and avoid fuel reverse to wind chamber.

Low bed pressure operation
  • By particle optimization, the operating bed pressure can be decreased to 3500Pa, which effectively saves operating costs and greatly reduces the oxynitride generated.

Model Rated Thermal Power t/h Working Pressure MPA Rated Output Water Temperature ℃ Thermal Efficiency %
DHX35-1.25-AⅠ 35 1.25 194 89
DHX50-1.25-AⅠ 50 1.25 194 89
DHX75-1.25-AⅠ 75 1.25 194 89
ZZ-35/3.82-AⅠ 35 3.82 450 89
ZZ-50/3.82-AⅠ 50 3.82 450 89
ZZ-65/3.82-AⅠ 65 3.82 450 91
ZZ-75/3.82-AⅠ 75 3.82 450 91
ZZ-75/5.3-AⅠ 75 5.3 485 91


  • It is used in calculating the heat transfer, typically by convection or phase transition between a fluid and a solid. The heat transfer coefficient has SI units in watts per squared meter kelvin: W/(m 2 K). Heat transfer coefficient is the inverse of thermal insulance. This is used for building materials (R-value) and for clothing insulation.

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  • Convective heat transfer coefficient for some common fluids: Air - 10 to 100 W/m 2 K; Water - 500 to 10 000 W/m 2 K; Multi-layered Walls - Heat Transfer Calculator. This calculator can be use to calculate the overall heat transfer coefficient and the heat transfer through a multi-layered wall.

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  • The overall heat transfer coefficient is a measure of the overall ability of a series of conductive and convective barriers to transfer heat. It is commonly applied to the calculation of heat transfer in heat exchangers , but can be applied equally well to other problems.

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  • The larger the coefficient, the easier heat is transferred from its source to the product being heated. In a heat exchanger, the relationship between the overall heat transfer coefficient (U) and the heat transfer rate (Q) can be demonstrated by the following equation: where

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  • The thermal resistance of heat-transfer in boiling of the heat-transfer medium 1/h 2 can be ignored. Therefore, in the calculation of the overall heat-transfer coefficient U , the quantity h 2 should be determined in the case of monophase flow in tubes.

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  • Overall heat transfer coefficients are dependant on many parameters such as the nature of the fluid, fluid velocities, type of heat exchanger, temperatures and fouling. Despite all these determining parameters, typical overall heat transfer coefficients are available for common applications and fluids.

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  • Heat Exchanger Heat Transfer Coefficients - Overall heat transfer coefficients in heat exchanger constructions - tubular, plate or spiral; Heat Loss from Oil Filled Tanks - Heat loss from insulated and uninsulated, sheltered and exposed heated oil tanks; Oil Tanks Heat Loss - Heat loss from lagged and unlagged, sheltered and exposed oil tanks

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  • Heat transfer coefficients for typical applications. Engineering Page provides online calculation and information services for engineers. TYPICAL OVERALL HEAT TRANSFER COEFFICIENTS (U - VALUES) Shell and Tube Heat Exchangers : Hot Fluid: Cold Fluid: Heat Transfer (hot) Oil: Heavy oils: 50 - 300: Heat Transfer (hot) Oil: Gases: 20 - 200

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  • Being able to efficiently add or remove heat is the primary function of a thermal fluid. The heat transfer coefficient is the calculated amount of heat that passes between the thermal fluid to or from any given surface it comes in contact with by way of convection – with the driving force behind the transfer of heat being the temperature differential between the two.

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  • Under convective heat transfer in a fluid with varying properties and in boiling, heat transfer coefficient may substantially depend on and ΔT . In these cases an increase of heat flux may give rise to hazardous phenomena such as burnout (transition heat flux) and deterioration of turbulent heat transfer in tubes.

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  • Related Resources: heat transfer. Convective Heat Transfer Coefficients Table Chart. Heat Transfer Engineering Thermodynamics . Convective Heat Transfer Coefficients Table Chart The following table charts of typical convective convection heat transfer coefficients for fluids and specific applications . Typical values of heat transfer coefficient

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  • The heat transfer coefficient at submerged surfaces in bubbling fluidized beds is affected by a number of operating parameters. Two of these parametric effects are illustrated by the data of Jacob and Osberg (1957).As seen from Fig. 3, the maximum value of the heat transfer coefficient is significantly affected by the particle size as well as by the thermal conductivity of the fluidizing gas.

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  • The over all heat transfer coefficient (U) This takes into account both conductive and convective resistance between two fluids separated by a solid wall. The overall heat transfer coefficient is the reciprocal of the overall resistance to heat transfer, which is the sum of the individual resistances.

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  • The overall heat transfer coefficient, or U-value, refers to how well heat is conducted through over a series of resistant mediums. Its units are the W/(m 2 °C) [Btu/(hr-ft 2 °F)].. Steam vs. Hot Water

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  • Dear All, Today's blog entry provides an equation for Overall Heat Transfer Coefficient for storage tanks handling Heavy Fuel Oil (HFO) / Asphalt and provided with tank heating coils using steam as a heating medium.

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  • Heaters Steam Water 1500 - 4000 Steam Organic solvents 500 - 1000 Steam Light oils 300 - 900 Heat Transfer (hot) oil Refinery hydrocarbons 250 - 550. TECHNICAL DATA 444 TECHNICAL DATA STEAM EQUIPMENT TYPICAL OVERALL HEAT TRANSFER COEFFICIENTS (U - VALUES) Air Cooled Exchangers Process Fluid U [W/m2 K] Water 300 - 450 Light organics 300 - 700

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  • Typical Overall Heat Transfer Coefficients. Refining Applications. Alkylation; Amine Treating; Catalytic Cracking; Warm Wash Heater: 100: Wax Oil Mix / Ammonia DP Chiller (with Scrapers) 30: Wax Oil Mix / Ammonia DP Chiller (without Scrapers) Thermal Cracking. Range, (Btu/h.ft².°F) Coker Combination TWR Condenser: 40: 50: Gas Oil

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  • Fouling in heat exchangers is a major factor which reduces performance of heat exchangers in due course by reducing the overall heat transfer coefficient. Fouling is the modification of surface of plates/tubes over time due to several factors. For example, corrosion, magnesium/calcium deposits or biological factors such as algae settlements.

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  • Predict storage tank heat transfer precisely. U is the overall heat transfer coefficient, T L is the bulk liquid temperature, T A is the ambient temperature, T G is the ground temperature, and

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  • The overall heat transfer coefficient is related to the total thermal resistance and depends on the geometry of the problem. For example, heat transfer in a steam generator involves convection from the bulk of the reactor coolant to the steam generator inner tube surface, conduction through the tube wall, and convection (boiling) from the outer tube surface to the secondary side fluid.

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