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steam boiler with pressure gauge

Industrial boiler scale remaining after pickling cleaning operation of boiler scale, and in particular the sulfate scale silicate scale even pickling method, it is difficult disposable washed. Residual scale much rougher than the surface of scale-free surface, a rough surface has a plurality of cavities, and the cavity was a stagnation region, where the scale easily concentrated, deposited, raw knot. Based on the above-mentioned negative factors, the boiler pickling, the handling of the residual scale is necessary. 2 2.1 descaling methods and principles sodium humate salt and so synergy, the purpose of removal of old scale during operation. 2.2 Principle dirt into CaC3 water residue. I play a dissolution of silicate. NaOH silicate scale is difficult to dissolve and react to produce soluble sodium silicate. The higher the temperature of the boiler water containing alkali solution, the above reaction is carried out more easily. An organic phosphonate of chelation and lattice distortion effect. Organic phosphonates and not only in aqueous solution Ca2-, Mg2- form a stable chelate compound, but also have been formed, and CaCO3 crystals phosphonic acid), since chelation Ca2-, so that CaCO3 scale layer many voids, reduce the interaction between the scale layer, the hard scale becomes debris in the pot of water to the boil, it played a role in the erosion and the dispersion, together with the waste water drain. The use of renewable organic polycarboxylate self-release effect and the descaling effect. Organic polycarboxylate heat transfer surface can form a film with such a film which is co-precipitated layer of scale grows to a certain extent will break, and the heat transfer surface away together with the scale, come off. Sodium humate by osmosis. Sodium humate has a strong penetration effect, can penetrate into the scale and the metal contact surface with calcium, magnesium metathesis reaction, the surface adhesion decreases old scale and metal fall off. Application Examples Example 3 a factory a KZL2-8 Horizontal package boilers, raw ground water, 10.Mg2 + hardness meter), although the water treatment equipment, due to poor water quality, combined with improper operation, junction raw scale, covering area of ​​more than 90%, the average thickness of 45mm, the thickest of 11mm. after pickling, whichever residual scale, through experiments, is determined sulfate scale. By its nature, the program uses the following: ⑶ epileptic), then cast added Na2C3, will increase the alkalinity boiler water to 18), an amount calculated as follows: G = the amount of V ° (D-D of the standard) MG-Na2C3 of , g; V- boiler water capacity, m3 (2t / h boiler by 4 meter) D required to achieve standard pan of water alkalinity, mmol / L (OH, D assay time of a pot of water alkalinity, mmol molar mass / L-NaC3 of persons Na2C3 after the above-described embodiment the dosage amount, than before dosing boiler water turbidity increases, first, because the agent itself increases the salt content, the second is the scale under the effect of the agent, gradually slag into water. over time, gradually reduce turbidity, running six months later, most of the remaining scale is removed a few off the bottom of the drum, into the soft dirt, water residue will easily become excluded. example two factory Taiwan KZL4-10 horizontal packaged boiler, no water quality testing prior to installation, commissioning a mistake softening equipment, water quality criteria is not met, resulting in the installation of new boilers three months after the operation, Wall Sheung scale portion is blocked, and the emergence of squib, replacing the 6, the remainder of the scale Of about 4mm, the individual parts 7 ~ 8mm. After pickling, the scale remaining large as replenishment of water in the furnace of the trona 3.5mmol / L, when the multi-alkalinity boiler was maintained at 15 ~ 20mmol / L or so ( OH, F COT), so there is no dosing Na2C3, adding only a HEDMP, HEMA and sodium humate, running four months, a significant reduction in the residual scale. problem most exposed parts of the metal to be noted that dosage .4 agent to remove residual main scale, must be strictly controlled boiler feed water or demineralized water hardness 0.03mmol / L or less (by Shi Ca2 ' "1Mg2 ten dollars), into the pot to prevent hardness scale and consumption of new raw junction agent. For this purpose, examples of a case of re-commissioning the softening equipment, examples of two direct replacement softening equipment, and analysis of operating personnel have been trained .5 conclusion after more residual scale boiler pickling, do not allow continuous pickling can be adopted pot-treatment method to solve.

Circulating or Bubbling ?

Boiler engineers can choose between two main types of fluidized-bed boilers—bubbling fluidized bed (BFB) and circulating fluidized bed (CFB). In BFB boilers the velocity of the combustion air is low enough that the fluidized particles remain in the lower furnace; in a CFB unit the velocity is greater and hot particles are circulated through the entire range of the boiler combustion zone. The fuel is in contact with the particles and effective mixing and combustion allows good efficiency and low emissions. Typically 97% to 99% of all burnable carbon in the fuel stream is combusted, even hard-to-burn materials. Boiler thermal efficiencies can be as high as 87% or more. Although both BFB and CFB systems are effective with biofuels, CFB is especially suitable for large boiler load ranges.

How to choose the type of heating boiler:

1. Need to understand the need for heating boiler customers heating house types: ordinary houses, office buildings, business district office buildings, plant workshops, greenhouses, coops and so on.

2. Normal residences, office buildings, commercial office buildings, etc. need to understand the heating area, you can refer to 1 ton boiler heating 8000-10000 flat for the customer selection, to choose the right parameters of the various boilers.

3. Plant workshops, coops, need to understand the height of the house, the area, and the customer's requirements for the indoor temperature to select the boiler model.

4. Greenhouses need to know the total heating area and where they are located. (usually greenhouses are more than 5,000 flat, you can consider using our hot water boiler)

5. If the customer's heating area is too large, for example 1 million flats, use a gas boiler. Can the customer be asked if he intends to go to a boiler or multiple units?

Fangkuai Group has more than 60 independent intellectual property rights, advanced clean fuel boiler manufacturing technology, and jointly established a clean fuel boiler production, research and research cooperation base with Tsinghua University and Xi'an Jiaotong University. An enterprise with a R & D and test center for clean fuel boilers. The thermal efficiency of “Fangkuai” boilers can reach 107%, which has been included in the national special equipment energy-saving catalog. The company developed ultra-low nitrogen full premixed combustion condensing boilers and ultra low nitrogen emission fuel gas boilers, which are developed by the company using Ultran condensation technology.

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