Product Description:
Coking furnace waste heat boilerThe use of forced circulation, i.e. steam and water working fluids inside the pipe, is driven by external forces (feed water pump, hot water circulation pump). This allows for unrestricted arrangement of the heating surface and makes it very compact.
The heating surface of the coking furnace waste heat boiler consists of two parts: the economizer section and the evaporator section. According to the heat balance calculation of the waste heat boiler, the waste heat boiler needs to produce saturated steam and reduce the exhaust gas temperature. The coking furnace waste heat boiler must be equipped with an economizer section to further absorb the low-level energy in the exhaust gas using feedwater. On the one hand, this can increase the feedwater temperature and steam production of the waste heat boiler, and on the other hand, it can improve the effective utilization rate of the heating surface in the evaporator section.
In order to improve the heat transfer temperature and pressure of the economizer, the economizer section adopts a counter current arrangement, that is, the flow direction of the working fluid and exhaust gas is opposite, while the evaporator section still adopts a co current arrangement.
In summary, installing a waste heat boiler in the tail flue of a coking furnace can achieve the goal of recovering waste heat from flue gas and protecting the environment. It is of great practical significance to effectively reduce energy consumption and promote the sustainable development of renewable energy.
Under normal circumstances, the coking furnace waste heat boiler opens a hole in front of the flap valve of the underground main flue, which leads the hot flue gas from the underground. After heat exchange and cooling by the waste heat recovery system, the flue gas temperature is reduced from 260 ℃ -300 ℃ to about 140 ℃ -160 ℃. It is then discharged into the reserved hole on the original chimney through the exhaust fan of the waste heat boiler and discharged into the atmosphere through the chimney.
In short,Coking furnace waste heat boilerThe layout location needs to be determined based on the actual situation of the user's site, and different choices should be made.

Product features:
(1) Reliability. The selection of all design parameters first considers the reliable operation of the coking furnace.
(2) Economic viability. On the premise of ensuring the reliable operation of the coking furnace, try to increase the heat exchange temperature difference as much as possible, reduce the volume and weight of the heat exchange surface, and reduce equipment investment. On the basis of technical and economic comparison, reasonably design the temperature for waste heat utilization of flue gas. If the flue gas temperature is excessively reduced, it will not only increase the daily power consumption of the induced draft fan, but also cause low-temperature corrosion to the chimney, affecting its service life.
(3) Reasonable optimization. By comparingCoking furnace waste heat boilerReasonably design and strive for high energy levels for heat recovery.
(4) Safe. Reasonably control the metal wall temperature of the heating surface and avoid the dew point of the flue gas. This is a prerequisite for ensuring that the heating surface does not leak, and all schemes must first meet this condition.

Product advantages:
◇Excellent wear resistance
Wear is mainly caused by the impact and cutting effect of ash particles on the pipe, with severe wear around the pipe at a 30 degree angle to the horizontal line. When S1/d=S2/d=2, the wear amount here is about three times the average value.
The staggered arrangement results in more severe wear on the second row due to changes in airflow direction. When S1/d=S2/d=2, the wear of the second row is twice that of the first row, and the wear of subsequent rows is generally 30% to 40% higher than that of the first row
The first row arranged in a straight line is the same as the first row arranged in a staggered line, and the pipes in each subsequent row wear less due to the impact of airflow. Under the same conditions, the wear of in-line bundles is 3-4 times less than that of staggered bundles.
The H-shaped finned tube heat exchanger adopts a sequential arrangement, and the H-shaped fins divide the space into several small areas, which has a uniform flow effect on the airflow. Compared with the light tube heat exchanger, spiral fin heat exchanger, etc. that adopt a staggered arrangement, the wear life is 3-4 times higher under the same conditions.

◇Reduced dust accumulation
The formation of dust occurs on the back and windward sides of the tube bundle. Misalignment of pipes can easily erode the bundle and result in less ash accumulation on the back surface. For tube bundles arranged in a straight line, due to the difficulty of airflow scouring the back of the bundle, there is more ash accumulation in the straight line arrangement than in the staggered arrangement.
H-shaped fins are welded on both sides of the tube that are less prone to dust accumulation, and the airflow flows straight without changing direction, making the fins less prone to dust accumulation.
There is a gap of 6-13mm in the middle of the H-shaped fins, which can guide the airflow to blow away the accumulated dust on the tube fins. At the appropriate wind speed, it has a good self-cleaning function
Spiral fins guide airflow to change direction due to the helical angle of the fins, resulting in severe ash accumulation in the finned tubes. For situations where loose ash accumulation cannot be formed, it is advisable not to use them. On site operation practice has shown that H-shaped finned tubes do not accumulate dust or accumulate very little dust, while spiral finned tubes accumulate dust severely.
Due to the straight channels formed on both sides of the H-shaped finned tube, using a soot blower can achieve good soot blowing effect.

◇Reduce smoke side resistance
Due to the straight channels formed on both sides of the H-shaped fins, and the spiral angle of the spiral fins guiding the airflow to change direction, the spiral fins are prone to dust accumulation and increase the smoke resistance compared to the H-shaped fins. Therefore, using H-shaped finned tubes can reduce wind resistance, lower the operating and investment costs of induced draft fans.

High welding fusion rate between fins and steel pipes
Due to the unique serrated structure of the H-shaped fins, the welding fusion rate between the fins and the steel pipe can reach over 98%, resulting in a good heat transfer coefficient of the H-shaped finned tube.

Overall product image:

technological process:
The flue gas process at the tail of the coking furnace is as follows: a hole is opened in front of the flap valve of the underground main flue gas duct, and the hot flue gas from the main flue gas duct is led out from the underground main flue gas duct to the inlet of the waste heat boiler through the flue gas duct. The flue gas flows from bottom to top, passes through the evaporator and economizer, is discharged into the main flue through the induced draft fan at the outlet of the boiler, and is discharged through the chimney. The temperature of the flue gas drops from 280 ℃ to 160 ℃, and the heat released is used to turn water into 0.8MPa saturated steam.