BGM Boiler Unit 35

Contents

1. Characteristics of BGM 35 M boiler unit

1.1. Brief description of BGM 35 M boiler unit

1.2.Additional diagram of BGM 35 M boiler unit

1.3. Thermodynamic data of BGM 35 M boiler unit

2. Check thermal calculation of BGM 35 M boiler unit

2.1.Determination of air volumes and heat contents and

fuel combustion products

2.2.Thermal balance and heat loss in boiler unit

3. Aerodynamic calculation of BGM 35 M boiler

3.1. Gas path resistance determination

3.2. Chimney height calculation

3.3. Calculation of chimney gravity

3.4. Calculation of the smoke pump

3.5. Calculation of blast fan

3.6. Selection of smoke and blast fan

List of literature

Graphic part of the project

Longitudinal section of the BGM boiler unit of 35 M, format A1, M 1:

Type of the BGM boiler unit of 35 M from above, format A1, M 1:

I-Chart

Brief description of BGM 35 M boiler unit

Gas-oil boilers of the BGM design of the Belgorod boiler plant have as their purpose the production of dry saturated or superheated steam up to 440 ° C, with a capacity of 35 t/h and an absolute pressure of 4 MPa (40 kg/cm2). The screen type boiler has a U-shaped arrangement with a shielded furnace so that all the heat necessary to produce steam is transmitted in it, as a result of which there is no need to install a convective heating surface, and instead of boiling pipes, tail surfaces are installed: superheater, water economizer, air heater. The boiler has a drum, a frame, a foundation, a coating, necessary fittings and a headset. Overall dimensions: upper elevation - 15.8 m, width along the axes of the columns - 5.31 m, depth - 12.28 m.

The BGM35 boiler has a two-stage evaporation scheme. Front and rear furnace screens are assigned to the first stage of evaporation (clean compartment). Pipes of the front screen at the bottom are welded into the lower collector, and at the top they form a ceiling screen and the ends of pipes of the ceiling screen are expanded into a drum.

Pipes of the rear screen at the bottom are welded into the lower manifold, and at the top, in the zone of flue gases passage, are diluted into a four-row feston and flared into a drum. In addition, the front manifold is connected to the upper drum by four downcomer pipes located outside the coating, and the lower manifold of the rear furnace screen is connected to the upper drum by six downcomer pipes also located outside the coating. Transverse front manifold is located above burners.

To the second stage of evaporation (salt compartment) there are two side screens - left and right, made similarly to left. Pipes of side screens are welded into lower and upper headers. Besides, lower manifolds of side screens are connected with upper drum by two lowering pipes located outside the coating. The left and right side screens have separately a remote cyclone and are connected to each other by three steam discharge pipes. All screens in the furnace are made of 60 × 3 mm pipes.

Let's go to the gas-air duct of the boiler equipment under consideration. Air is blown by a blast fan into a tubular two-stage air heater, where it is heated to about 170 ° C and supplied to burners installed at the front of the boiler in the amount of five pieces: three at the top and two at the bottom (with the lower ones being decay). Flue gases give heat in the furnace to all screen heating surfaces, and then, having passed the feston, superheater tubes, water economizer, air heater, with a temperature of 158.. 180 ° C smoke is removed to the atmosphere through the chimney.

With regard to the main natural circulation circuits for boiler equipment referred to in the article, the following can be said. Main circuits of natural circulation. Feed water from the deaerator tank is supplied by the feed pump to the header, and then to the pipes of the boiling water economizer, where the water is heated to about 145 ° C and passing through the collection header, is supplied through three feed lines to the boiler drum, where it is mixed with boiler water. One of the three available feed pipes is fed to a steam cooler installed in the superheater section in order to control the temperature of superheated steam.

Clean compartment. Part of the boiler water from the drum through four downcomers is supplied to the lower header, distributed along the pipes of the front furnace screen, which shields the front and ceiling of the furnace, and the resulting steam-water mixture (PVA) through this screen goes into the drum. Part of the boiler water from the drum through six downcomers is supplied to the lower header, distributed along the pipes of the rear furnace screen, and the formed PVC goes to the drum through this screen and festoon.

Salt compartment. Part of the boiler water from the drum is fed through two downcomers to the lower header, distributed through the pipes of the left side furnace screen, and the formed PVC along this screen rises into the upper header, from where it goes to the remote cyclone through three steam discharge pipes. In the cyclone, steam and water are separated: steam through two steam removal lines goes to the drum, and water from the cyclone through three downcomers returns to the lower header of the side screen. The right side furnace screen works similarly.

BGM35 boilers are produced both with and without cyclones, and they do not have upper side headers, and the pipes of the side screens are flared into the boiler drum. But in the boiler drum there are two transverse partitions with overflow pipes (nozzles) in the water volume, which divide the boiler space into three compartments: one clean and two salt. Steam superheater is cleaned by stationary steam blowers. The boiler is also equipped with a device for cleaning the heating surfaces of the water economizer and the air heater with shot. The boiler is lightweight, fixed on the frame, with steel skin.

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