Boiler VK 21 diagrams drawings
Water heating boiler VK 21.
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The boilers are designed for heating and hot water supply in various industries and construction, where stationary and mobile automated boiler systems operating in closed heat supply systems are used.
The boiler design incorporates progressive technical solutions, providing high technical and economic indicators that meet the requirements of both domestic and foreign standards, which is confirmed by the operating experience of these boilers.
The boilers are equipped with a gas burner with an automatic system that provides start, stop, heat output regulation and protection in case of violation of the specified operating mode. The complete set of delivery, the absence of lining, and the presence of a support frame reduce the cost of installing boilers to a minimum. Boilers practically do not pollute the environment.
Water heating boilers of the VK series
Fire-tube water-heating boilers of the VK series are intended for heating and hot water supply of buildings with an absolute water pressure of no higher than 0.7 MPa and a maximum heating temperature of 115 0 C. The heating boilers are steel water-heating fire-tube boilers. The first stroke of the boilers is formed by a flame tube. The second is formed by smoke pipes of the convective part of the boilers.
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Indicator name |
VK – 22M |
VK – 21 |
VK - 22 |
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Power MW (Gcal) |
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Heating capacity, % |
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Gas burners for liquid fuel |
GGS – B – 1.4 APND – 1.4 |
GGS – B – 3.5 APND – 3.5 |
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Type of fuel |
natural gas GOST 5542-87, light liquid fuel, oil |
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Consumption: natural gas GOST 5542-87 (m 3 / h) light liquid fuel, oil (kg/h) |
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Water temperature /degree C/: in front of the boiler after the boiler |
not lower than 70 |
not lower than 70 |
not lower than 70 |
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Water pressure MPa |
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Volume of water passed through the boiler (m3) |
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Boiler water volume (m3) |
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Gas pressure in the boiler manifold (KPa) |
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Gas pressure in front of the burner (KPa) |
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Air pressure in front of the burner (KPa) |
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Nominal hydraulic resistance (KPa) |
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Vacuum behind the boiler (Pa) |
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Furnace pressure (Pa) |
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Flue gas temperature ºС |
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Excess air ratio |
from 1.1 to 1.25 |
from 1.1 to 1.25 |
from 1.1 to 1.25 |
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At least 94% |
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Weight /kg/ no more |
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Dimensions: |
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Heated area (m2) |
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Heated volume (m3) |
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Alapaevsky Boiler Plant LLC also produces spare parts for VK series boilers:
- smoke pipes: - with a diameter of 42x3.5 mm to the boiler VK-21, - with a diameter of 57x3.5 mm to the boiler VK-21, VK-22
- tube sheets for boilers VK-21 (f 57x3.5 mm; 42x3.5 mm), VK-22
- flame tubes for the VK-21 boiler made of sheet metal
Water heating boilers of the AKS series
Boilers of this series are designed for connections to water heating systems to obtain hot water with temperatures up to 103 0 C. These boilers are single-circuit steel water-heating boilers with a two-pass combustion chamber with a reversible firebox. Smoke pipes are located horizontally and are equipped with turbulators (8). The combustion chamber door (1) can open to the left or to the right. Thermal insulation of the housing (7) is made of mineral wool and aluminum foil. The second layer of mineral wool insulation is installed on steel panels of a red decorative casing. The decorative casing is supplied in separate packaging and is designed for on-site assembly.
The boilers are designed to work together with two-stage forced-air burners running on gas or liquid fuel. Electrical diagram The boiler is designed to control the burner and safety automatics.
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Specifications |
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Thermal power, kW |
115–150 |
185–235 |
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Rated operating temperature, °C |
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Maximum operating water pressure, MPa |
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Coefficient useful action, not less than % |
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Type of fuel |
Natural gas, diesel fuel |
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Water flow through the boiler (m 3 / h) |
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Maximum hydraulic resistance, kPa |
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Boiler weight, kg |
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Heating connection pipes, mm |
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Overall dimensions, mm: Height (according to the connecting pipe) |
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Æ chimney, mm |
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Æ of pipeline, mm direct water |
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Æ pipeline mm return water |
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Heated room area, m2 |
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Heated volume of the room |
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Total weight, kg |
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Required pressure, mbar in the combustion chamber |
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Water volume, l |
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Unique advantages:
AKS boilers are equipped with a special device that prevents scale deposits on heating surfaces and ensures the boiler operates without repairs and chemical washing throughout its entire service life;
The use of AKS boilers allows the buyer to reduce gas consumption by 3-5%, increase efficiency to 94.4%, and reduce the temperature of exhaust gases by 10-15% through the use of special turbulator devices.
Purpose of the product
The KSVa-2.0 Gs boiler (VK-21) is designed for heat supply in a closed circuit (without direct water withdrawal from the heating network) to buildings and structures for various purposes, when operating on medium-pressure natural gas.
Scope of application - electrified and gasified areas Russian Federation, as part of a boiler room and a mobile automated boiler installation, at altitudes no higher than 1000 meters above sea level.
The boiler room in which the boiler is installed must be equipped with installations for pre-boiler treatment of network and make-up water. The quality of supply and make-up water must comply with the requirements of SNiP II-35-76 and Table 1.
The main technical data and characteristics of the boiler are given in Table 2, purchased components - in their data sheets, gas block burner GGS-B -2.2 - in the operating manual GGS-B.00.00.00.00 RE
Table 1
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Indicator name |
Unit |
The value of the indicator |
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1 Suspended matter |
mg/l |
5, no more |
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2 Ring transparency |
cm |
50, no more |
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mg/l |
0.1, no more |
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4 General hardness |
mg eq/l |
5, no more |
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5 Carbonate hardness |
mg eq/l |
3, no more |
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mg/l |
0.03, no more |
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7 RN |
PH units |
8, no more |
Product composition
The product includes the following main assembly units and components:
Boiler part;
Burner with fan and automatic safety and regulation system;
Instrumentation and sensors of the automation system;
Control desk.
The complete set of delivery of the boiler is given in its “Passport”.
Specifications
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Indicator name |
The value of the indicator |
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1 |
2 |
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Nominal heating capacity, MW (Gcal/hour) |
2,0 (1,72) |
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Permissible deviations of rated heating capacity, % |
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Heat output control range relative to nominal, % |
40 -100 |
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Efficiency, % |
91, no less |
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Type of fuel |
Natural gas GOST 5542 |
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Connecting gas pressure, kPa |
36 + 10 % |
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Specific fuel consumption at Q=33520 kJ/m 3, m 3 /MW |
118, no more |
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Working water pressure, MPa |
0.6, no more |
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Temperature of water leaving the boiler, 0 C |
115, no more |
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Return water temperature in front of the boiler, 0 C |
60, no less |
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Nominal hydraulic resistance at a design temperature difference of 25 0 C, kPa |
30, no more |
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Water consumption, with a calculated temperature difference of 25 0 C, m 3 / h |
69, no less |
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Nominal vacuum behind the boiler, Pa |
80, no more |
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Pressurization in the furnace at rated heating capacity, Pa |
500, no more |
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Flue gas temperature at rated heating output, 0 C |
160, no less |
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Excess air factor (α) |
1.25, no more |
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Boiler class |
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Carbon monoxide (CO) |
130, no more |
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Nitric oxide (in terms of NO 2 ) |
200, no more |
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Weight, kg |
5500, no more |
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Overall dimensions (length, width, height), m. |
4.4x2x2.6, no more |
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Characteristics of the supply network |
~3x220/380 V, 50 Hz, N |
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Permissible deviation of supply voltage, V |
From plus 10 to minus 15, inclusive |
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Specific electricity consumption kW/MW |
2, no more |
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Sound level at control points, dBA |
80, no more |
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Response time of protective devices, s: |
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When igniting the boiler |
3, no more |
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When the flame goes out |
2, no more |
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When there is a power outage |
1, no more |
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Degree of protection of automation equipment |
not less than IP40 according to GOST 14254 |
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Mean time between failures, h |
3000, no less |
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Volume of heated premises, m³ |
40000 |
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Service life before write-off, years |
Design and operation
The boiler part consists of a body, a front water-cooled cover, a flue gas exhaust duct, supports, a frame, thermal insulation and a decorative casing.
The boiler body is cylindrical in shape and includes a combustion chamber, front and rear tube sheets, a convective flue and an outer shell.
The combustion chamber is cylindrical, made in the form of a flame tube with a welded flat bottom.
The flame tube's leading edge is welded to the front tube sheet, and the bottom of the flame tube is connected to the rear tube sheet by 24 anchor rods.
The bottom of the flame tube and the rear tube plate form a plastic system that compensates for the thermal expansion of the flame tube.
The tube plates, the flame tube and its bottom are made of sheet steel.
The convective flue of the boiler is formed from 152 smoke tubes located on 3 concentric circles. The pipes are grouped into 4 bundles and welded into tube sheets. Gaps are left between the bundles of smoke tubes for inspection and cleaning of the boiler on the water side. Seamless pipes are used as smoke pipes. Circular grooves are rolled onto the pipe to intensify heat transfer.
The outer shell is made of sheet steel. On the outer shell there are:
1) return water inlet pipe;
2) direct water outlet pipe;
3) a pipeline connecting the front cover and housing with a compensator and an outlet for draining water from the boiler;
4) outlet pipe of the water-cooled cover with an air vent and compensator;
5) 4 hatches on the water side for inspection and cleaning of the boiler from sludge;
6) brackets with hinged bolts for fastening the front water-cooled cover;
7) explosion valve;
Boiler supports are also attached to the body for installation on the frame.
1.4.2.4 The front water-cooled cover consists of 2 standard elliptical bottoms. In the central part of the cover there is a burner pipe with a flange for connecting the burner.
The flange has threaded holes for installing hinge hinges. Hinged hinges make it easier to clean and repair burner components.
The flange is square and allows the installation of various types of burners on the boiler.