DZL coal-fired steam boiler

Reciprocating grate

DZL single drum coal-fired steam automatic

Installation location diagram of single-drum coal-fired steam economizer

Coal-fired steam boiler installation system diagram

Single drum coal-fired steam automatic

The new DZL series boiler is a single-drum vertical water-fire tube shell boiler, and the combustion equipment is a chain grate. Boiler water circulation is natural circulation plus ejection. The water-cooled walls on the left and right sides of the furnace are radiation heating surfaces, the two wings of the furnace are convection heating surfaces, the threaded smoke pipes are arranged in the boiler drum, and the front and rear arches are made of heat-resistant concrete. Shield shell.

1. This series of boilers adopts arched tube plates, threaded smoke tubes, hot water boiler return water ejection technology, etc., which solves the problems of tube plate cracks, bulges in the lower part of the drum, bursting tubes in the water wall, low thermal efficiency and insufficient output of shell boilers. , Poor adaptability of coal quality and other issues.

2. Combustion process

The fuel falls from the coal scuttle to the front of the grate. With the operation of the grate, the coal undergoes preheating, dry distillation, ignition, and embers. The slag falls into the slag hopper and is discharged from the furnace at any time by the slag remover. The throat in the middle can form a vortex and fully mix with the air, and heat the front arch and fire conditions. It enters the two-wing convection tube bundle through the exit smokestack on the upper part of the arch, enters the threaded smoke pipe through the front smoke box, and passes through the economizer and dust collector. The fan leads to the chimney for discharge.

Boiler Energy Efficiency Test

3. Technical features

(1) The drum is composed of arched tube plate and threaded smoke pipe, so that the drum changes from a quasi-rigid body to a quasi-elastic structure, canceling the braces in the tube plate area and reducing the stress. The smoke tube is changed from two-pass to single-pass, which solves the problem of tube plate cracks.

(2) Due to the arrangement of ascending pipe rows in the lower part of the drum, the dead water area at the bottom of the drum is eliminated, the sludge is not easy to deposit, the high temperature area of ​​the drum can be well cooled, and the lower part of the boiler shell is prevented from bulging.

(3) The heat transfer threaded flue tube is used to obtain enhanced heat transfer effect, achieve the characteristics of boiler temperature rise and pressure rise quickly, and improve the thermal efficiency of the boiler.

(4) The structure is compact. Compared with the same type of boilers, the overall size is small, which saves the capital investment of the boiler room.

(5) Stable operation, convenient adjustment and sufficient output. With 110% overload capacity.

(6) The hot water boiler has made significant improvements in water circulation. The jet technology is successfully adopted, and the return water is injected into the downcomer by spraying water, so as to increase the circulating flow rate of the upcomer.

(7) The threaded smoke pipe is used to enhance heat transfer, which improves the heat transfer coefficient and thermal efficiency. Since the flue gas has a disturbing effect in the pipe, the smoke pipe is not easy to accumulate dust and plays a self-cleaning role.

(8) The furnace adopts an energy-saving furnace arch cast with heat-resistant concrete as a whole, and an independent air chamber is used for coal fire conditions to achieve a reasonable air distribution and form an aerodynamic field in the furnace that is conducive to combustion, thereby expanding coal combustion. species adaptability.

Coal-fired boiler finished product display area

(9) The furnace arch and exit chimney of the boiler all have dust removal function. The original dust concentration of the boiler is controlled below the standard, ensuring that the smoke and dust emission of the boiler meets the national environmental protection regulations.

The intelligent control cabinet is designed according to the operating procedures and control requirements of the steam boiler, and is designed according to the characteristics of the combustion system of the coal-fired boiler. It has the functions of semi-automatic control and fault protection for the coal-fired hot water boiler. The main control objects are blower, induced draft fan, water supply pump, coal loader, grate, and slag discharger. The system uses PLM as the core of data processing and control, professional instruments as operation and display, multi-level protection functions, and safety interlocking are simple, easy, convenient and reliable, making the system safer during operation.

The control system is embedded with Fenglan's well-designed industrial control software and the process structure of the control periphery. The system software not only realizes general monitoring requirements such as boiler manual/automatic control, working condition monitoring, real-time trend, etc., but also adds the results of Fenglan Company's careful analysis and research on boiler accidents in recent years, and has a wealth of faults Detection, fault alarm, fault handling and other functions ensure the safe and reliable operation of the boiler.

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workshop