DHL series water tube boiler

DHL Boiler Product Introduction:

In recent years, with the rapid development of the market economy and the continuous improvement of people's living standards, their environmental awareness has also been enhanced. The country advocates vigorously developing environmentally friendly and energy-saving products. Our company has launched a single drum horizontal forced circulation chain furnace drainage pipe hot water boiler. This type of boiler has been widely promoted and used in China, and is currently an ideal equipment for centralized heating.

This boiler is a high-temperature hot water boiler with forced circulation and a single drum horizontally arranged U-shaped layout. It adopts a layered coal feeding device and a cross beam type non leaking coal chain grate combustion equipment. Membrane water-cooled wall tubes are arranged around and in the middle of the furnace to absorb the radiation heat of high-temperature flue gas inside the furnace. Arrange a slag condensation tube at the furnace outlet, which is diluted by the rear water-cooled wall tube, to further absorb radiant heat. To ensure full combustion of coal and combustion efficiency, the coverage rate of the front arch on the grate is 25 ; The coverage rate of the rear arch on the grate is 57 , which can achieve a good effect when combined with the grate. Due to the width of the furnace, two sets of steel tube type serpentine tubes are arranged in parallel at the tail end for convective heating, and two sets of air preheaters are arranged in parallel behind the convective heating surface. The flue gas flows longitudinally through the tube bundle inside the tube, while the air flows laterally outside the tube. The air preheater is placed on the operating platform outside the steel frame. In the furnace, a scientific combination of front and rear arches is used to achieve high combustion efficiency and high internal heat load. The grate adopts stepless speed regulation, which can meet the user's arbitrary adjustment of load without affecting the thermal stability of combustion.

According to user needs, this boiler can be arranged in a double-layer or single-layer configuration.

Boiler body water process

Water supply → Water cooled wall behind the furnace → Heating surfaces of two sets of serpentine tubes → Water cooled walls on both sides of the furnace → Water cooling screen → Water cooled wall in front of the furnace → Boiler drum → Boiler effluent.

DHL boiler features:

1. Adopting a mature ∏ - shaped layout, the boiler layout is compact, small in size, occupies less space, and reduces boiler room investment.

2. The layout of the boiler heating surface fully utilizes the space of the boiler, with membrane water-cooled walls arranged around the furnace and connecting pipes arranged outside the boiler body. The convective heating surface adopts a serpentine tube structure, and the inlet and outlet headers are located outside the boiler, making installation and maintenance convenient, with less ash accumulation and easy cleaning.

3. The boiler drum is arranged above the furnace and is connected to the power supply protection pipes between each upper header, which provides good self-protection.

4. The boiler body adopts forced circulation, with high water velocity, rising water velocity between 1.0-1.15m/s and falling water velocity between 1.1-2.0m/s. Adopting a drum form to increase the boiler water capacity and ensure the safe operation of the boiler.

5. The boiler adopts a full protective plate structure, and the furnace is a full membrane wall with good sealing performance. The boiler has less air leakage, greatly reducing the heat loss of the boiler exhaust gas and improving the thermal efficiency of the boiler. Simultaneously reducing boiler flue gas emissions and decreasing the power consumption of boiler induced draft fans.

6. This boiler is designed with a larger furnace, which prolongs the residence time of flue gas in the furnace, allowing fly ash and combustible gases to be fully burned and improving combustion efficiency. In addition, the low rising speed of flue gas in the furnace greatly reduces the amount of fly ash carried by it, reducing the original emission concentration of the boiler.

7. The boiler arch type adopts the scientific and technological achievements of the national "Seventh Five Year Plan" research and development project of Xi'an Jiaotong University (the rear arch outlet adopts a right angle furnace arch), ensuring the combustion of inferior coal and expanding the adaptability of boiler coal types.

8. The boiler grate adopts a crossbeam grate to improve operational safety. At the same time, the grate structure is reasonable and has good air conditioning performance, ensuring complete combustion and greatly reducing mechanical incomplete combustion losses.

9. Power outage protection

The upper part of the boiler is equipped with a drum, which increases the water volume of the boiler. After a power outage, the boiler can meet the cooling needs of the water-cooled wall.

To prevent sudden power outages that may cause water hammer or even overheating of the boiler tubes during operation, the following measures are taken:

Each circuit of the water-cooled wall is connected to a steel pipe and a drum. Once there is a power outage, forced circulation is converted to natural circulation.

The water-cooled wall pipes in the furnace are made of pipes with diameters of 60mm and 73mm. After a sudden power outage, a single pipe can form its own natural microcirculation, preventing the pipe wall from overheating for a certain period of time.

In the event of a sudden power outage, according to the change in hot water pressure, a portion of the vent valve should be appropriately opened. At the same time, it is required to ensure that the hot water pressure in the boiler system is not less than 0.5 MPa, and the saturation temperature of the hot water at this pressure is not less than 150 ℃. This can allow only a small amount of boiler water to vaporize under the residual heat in the boiler. Due to the fact that the boiler drum is located at the top of the boiler, other heating surface tubes are always in a state of water, making the boiler safe and reliable in the event of a sudden power outage.

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