Water-cooled wall anti-wear grid warp and weft structure, study of circulating fluidized bed boiler composition

Circulating fluidized bed heating furnace composition

Literally understood, the heating furnace is composed of "pot" and "furnace", the circulating fluidized bed heating furnace is composed of an incineration system, a carbonated beverage system, a wind and smoke system and ancillary facilities.

First, ignite the system software:

The so-called "furnace" mainly consists of a furnace, a cyclone dust collector, a feeder, etc. Its task is to make the fuel ignite well in the furnace and release the heat.

1. Furnace. Also called the engine combustion chamber, it is the area for fuel ignition. It is a space formed by a furnace body and a water wall. The fuel is ignited in a fluidized state in this special space.

2. Cyclone dust collector. The cyclone separator is one of the key components of the circulating fluidized bed heating furnace. Its main function is to extract a large amount of high-temperature solid raw materials from the gas at the furnace entrance and exit. The fuel and desulfurization catalyst are circulated multiple times to continuously ignite and react through the return equipment to the furnace to maintain rapid air flow in the combustion chamber.

3. Return valve. It is arranged under the separation device. Its function is to send the bed material separated by the separation device to the second furnace. The circulating amount of solid particles determines the concentration of solid particles in the fertilized egg implantation bed, and the concentration of solid particles has an impact on the circulating fluidized bed. It plays a greater role in ignition and heat conduction, and is the basis of the circulating fluidized bed to ensure the stable fluidity of circulating raw materials.

Second, Fengyan system software:

It mainly consists of induced draft fan, high pressure fluidizing fan, secondary fan, primary fan, air chamber, powerless hood, air distribution board, tail exhaust duct, air preheater, etc.:

4. Air distribution equipment: The air distribution device is an important component of the air flow transportation and ignition of the heating furnace. The function of the air distribution fan blades is to support the power hood and insulation board and basically distribute the airflow. The water-cooled air-conditioning fan blades adopt a tubular water-cooled wall tube stretching method, with holes punched in the fins between the tubes and a power hood in the structure.

5. Primary fan: In the circulating fluidized bed furnace, the primary fan is the fan with the most uses and the largest power. It is a high-pressure, large-space centrifugal fan. The main function of the primary fan: After the primary air is pressurized, it enters the furnace through the power hood embedded in the air-conditioning fan blades to fluidize the bed coal in the furnace.

6. Secondary air fan: The secondary air fan mainly sends the combustion air required by the heating furnace into the furnace.

What is the effect of too thin or too thick material layer on the anti-wear operation of circulating fluidized bed boiler water wall?

When the boiler anti-wear layer is too thin, the following problems are likely to occur:

(1) CFB boiler anti-wear is very likely to cause abnormal conditions such as channeling and throttling. Boiler water-cooled wall anti-wear.

(2) The material layer has less heat storage. When there is a coal break or long flame coal change, the raw coal moisture increases, or the actual slag discharge operation is not properly supervised, the bed temperature fluctuates greatly, and abnormal conditions such as a sharp drop in bed temperature are likely to occur. Grid anti-wear Jingwei structure.

When the material layer is too thick, the following problems are likely to occur: Grid anti-wear Jingwei structure.

(1) Boiler anti-wear is very likely to cause graded abnormal fluidization. CFB boiler anti-wear, boiler water-cooled wall anti-wear.

(2) When the boiler water-cooled wall anti-wear material layer is too thick, in order to achieve a better fluidization state, it is necessary to increase the standard baffle opening to significantly increase the pulling force, get rid of the friction resistance of the material layer, ensure that the fluidization exhaust volume is sufficient, and thus increase the standard power consumption.

(3) In serious cases, the fan motor's high efficiency pulling force cannot break away from the thickness of the material layer, resulting in the fluidization exhaust volume exceeding the material layer and failing to fluidize normally. The boiler's anti-wear material layer is scaled and the centrifugal fan vibrates. CFB boiler anti-wear.

What is the reason for the reduction of the combustion ratio in the dense phase? Geshan anti-wear Jingwei structure.

(1) The fluidization wind speed of the boiler is increased. When the fluidization wind speed is increased, a large number of small particles are thrown into the floating section. The CFB boiler anti-wear causes the indoor flammable concentration to increase significantly and the upper temperature to increase, which increases the upper combustion ratio. At the same time, it is the cooling effect of the relatively low temperature primary air. The lower bottom temperature causes the ignition delay. Boiler water-cooled wall anti-wear.

(2) The thickness of the boiler water-cooled wall anti-wear material layer changes. After the boiler anti-wear layer is reduced to an appropriate thickness, the enhancement of the segregation effect of the boiler hot surface anti-wear grid anti-wear structure makes the heat storage capacity of the material layer and the effect of capturing particles stronger, and the boiler anti-wear reduces the combustion rate of the material layer itself. However, if the material layer is too thin, it will cause the fluidization to be too strong in some areas and too weak in other areas, and it is impossible to ensure the bed temperature is consistent in all places. At this time, it is necessary to appropriately increase the thickness of the material layer.

(3) There are too many fine particles in the fuel and the ash content is relatively large. When the fine particles and ash content of the CFB boiler anti-wear increase, the concentration of combustibles in the floating section increases, which increases the raw materials participating in the circulation process in the floating section and reduces the combustion rate of the material layer.

(4) The boiler anti-wear bed temperature decreases. When the bed temperature decreases, the fuel combustion reaction rate decreases, delaying the reaction process of the material layer combustion, resulting in combustion retardation. Grid anti-wear structure.

(5) The application of smoke recycling. The recirculation of boiler water-cooled wall anti-wear smoke makes the oxygen content in the material layer significantly reduced. Under the same bed soft material layer standards, the combustion amount inside the material layer is limited, so that its combustion ratio is reduced.

Production steps for large-diameter medium-frequency pipe bends and inspection requirements for flanging and cutting of medium-frequency pipe bends

In recent years, more and more pipe products have been used in our industrial production and daily life. The convenience of these pipes has made great use in our daily life. As people's application requirements increase, the quality standards for this kind of pipes have become higher and higher, and large-diameter medium-frequency elbow pipes are used in many areas. Today we will come to a professional large-diameter bent pipe manufacturer to see how these large-diameter mid-frequency bent pipes are produced. I hope you can understand it.

Large-diameter medium-frequency bending pipes use medium-frequency induction heating. The product workpiece is bent under partial heating. The large-diameter medium-frequency bending pipe processing technology is one of the most economical and efficient elbow processing technologies at present. In the entire large-diameter high-frequency bending process In the process, the coil is placed on the seamless steel pipe to be bent, the pipe head is clamped with a mechanical rotating arm, and the seamless steel pipe is heated by introducing high-frequency current into the coil. When the temperature of the seamless steel pipe rises to the plasticity state, it is pushed by the back-end machinery of the seamless steel pipe to bend. The bent seamless steel pipe is quickly cooled by the cooling liquid. We need to select the electromagnetic coil according to the pipe specifications to make the hydraulic transmission The system is ready for operation. Place the pipes in place, measure the bending points, clamp the clamp joints, operate the power supply valve, and check the cooling water spray.

After confirming that all the above are normal, start the induction plug-in immediately. When the pipe is heated to the appropriate bending temperature, open the oil passage of the hydraulic system, push the bending, and observe the bending condition. Immediately after the bending is completed, Stop the hydraulic system position, at the same time stop the magnetic induction plug-in, turn off the cooling water, loosen and tighten the fixture, or repeat the above process to continue bending, or disassemble the elbow.

It can be seen that the production process of this large-diameter medium-frequency bent pipe is still relatively complicated, but only through the intricate production process can better quality pipe products be produced, especially the bending process. If Poor quality management of bending processing will undoubtedly affect the quality of the pipeline and even cause damage to the pipeline. Therefore, when we produce large-diameter medium-frequency bent pipes, we must follow the following procedures to ensure the quality of pipeline production.

The curvature of the medium frequency elbow is basically fixed. During the construction process of building decoration materials, it takes advantage of its own bending advantages and brings a lot of convenience to the construction. What requirements must be met for flanging removal testing?