Gas Fired Steam Boiler
Product thermal capacity: 1-20 t/h
Working pressure: 0.7-2 Mpa
Available fuel: Nature gas, coke oven gas, biogas, methanol, liquid propane gas, diesel, heavy oil, light oil, crude oil, etc.
Available industries: Heat supplying, chemical, food, textile, printing and dyeing, cigarettes and tobacco, fodder, pharmacy, building materials, brewery, rubber, hospital etc.
Gas Fired Steam Boiler Introduction
The gas steam boiler adopts the boiler shell type three return journey, full wet back structure. The fuel is slightly positive pressure burning in the furnace bile, and the high-temperature flue gas enters into the flue tube bundle along the furnace bile through the backburner chamber, and enters the second tube bundle through the compression front smoke box turning 180°, and enters the atmosphere after convection heat transfer. The three-return steam boiler with large capacity is designed by using the design idea of three-return structure with symmetrical center.
All pressure components of this series gas fired boiler are symmetrical to the drum center. The boiler adopts a full wet back structure, with a large inner cylinder and eccentric fire box structure, which is beneficial to provide enough radiation heating surface. The convection heating surface consists of a second and a third return tube bundles. The front tube plate of the return combustion chamber is connected with the furnace bladder, and the rear tube plate of the return combustion chamber is ellipsoidal head and tube plate. The second and third return smoke Chambers constitute the front smoke box. Therefore, the structure of the front smoke box adopts light structure of refractory insulation materials. The flue gas outlet of the rear flue gas box is arranged along the longitudinal axis of the cylinder, which can not only shorten the length of the furnace body;It can also prevent the chimney from being placed in the direction perpendicular to the longitudinal axis of the cylinder, and condensate water from corroding the boiler body when the boiler starts and stops.
The boiler design mainly considers the principle of boiler maintenance and stability. The mixed water device is installed in the inlet of the boiler return water. The return water scour the tube bundle of the smoke pipe first and then contact the furnace bile, which improves the water temperature of the return water contact the furnace bile. The phenomenon of local supercooled boiling is avoided. The water in the lower part of the high temperature combustion flue gas, the low temperature flow in the upper part. In terms of thermal convection, the structural design has been achieved. The steam boiler also reaches the vaporization space, and the rear bulkhead causes the circulating water to flow through the high-temperature surface of the recombustion chamber, so that the heat transfer is reasonable and uniform. Ensure the safe operation of the tube plate in the return combustion chamber.
Gas Fired Steam Boiler Advantages
- The waveform furnace not only enhances the disturbance of flue gas, but also increases the radiant heat transfer area.
- It increases the stiffness of the furnace liner and weakens the expansion stress of the furnace liner effectively. It not only enhances the heat transfer effect, but also promotes the combustion of fuel in the furnace.
- The advanced technology of pre-expansion, full welding and then expansion joint is adopted, which not only prevents the gap corrosion, but also enhances the welding strength.
- Easy to open, easy to repair and clean;
- This series of boilers have compact structure and convenient installation and transportation. After the hot state debugging before the factory, no matter in the opening rate or in the operation can run stably;
- The gas-fired steam boiler is equipped with imported feed water pump and burner, fully automatic program control and high degree of automation. Can make the boiler to achieve the combustion effect.
Gas Fired Steam Boilers Parameter
| Model | Rated steam capacity（t/h） | Rated working pressure（Mpa） | Rated steam temperature（℃） | Maximum transport size(m) (L×W×H) |
| WNS1-0.7-Y(Q) | 1 | 0.7 | 170 | 3.3×1.8×2.1 |
| WNS1-1.0-Y(Q) | 1 | 1 | 184 | 3.3×1.8×2.1 |
| WNS1.5-1.0-Y(Q) | 1.5 | 1 | 184 | 3.0×1.8×2.0 |
| WNS1.5-1.25-Y(Q) | 1.5 | 1.25 | 194 | 3.0×1.8×2.0 |
| WNS2-1.0-Y(Q) | 2 | 1 | 184 | 4.4×2.1×2.5 |
| WNS2-1.25-Y(Q) | 2 | 1.25 | 194 | 4.4×2.1×2.5 |
| WNS3-1.0-Y(Q) | 3 | 1 | 184 | 4.6×2.3×2.6 |
| WNS3-1.25-Y(Q) | 3 | 1.25 | 194 | 4.6×2.3×2.6 |
| WNS4-1.25-Y(Q) | 4 | 1.25 | 194 | 4.7×2.5×2.9 |
| WNS4-1.6-Y(Q) | 4 | 1.6 | 204 | 4.7×2.5×2.9 |
| WNS5-1.25-Y(Q) | 5 | 1.25 | 194 | 5.3×2.7×3.3 |
| WNS5-1.6-Y(Q) | 5 | 1.6 | 204 | 5.3×2.7×3.3 |
| WNS6-1.25-Y(Q) | 6 | 1.25 | 194 | 5.9×2.6×3.0 |
| WNS6-1.6-Y(Q) | 6 | 1.6 | 204 | 5.9×2.6×3.0 |
| WNS8-1.25-Y(Q) | 8 | 1.25 | 194 | 5.9×2.8×3.1 |
| WNS8-1.6-Y(Q) | 8 | 1.6 | 204 | 5.9×2.8×3.1 |
| WNS10-1.25-Y(Q) | 10 | 1.25 | 194 | 7.7×2.8×3.1 |
| WNS10-1.6-Y(Q) | 10 | 1.6 | 204 | 7.7×2.8×3.1 |
| WNS15-1.25-Y(Q) | 15 | 1.25 | 194 | 7.0×3.1×3.6 |
| WNS15-1.6-Y(Q) | 15 | 1.6 | 204 | 7.0×3.1×3.6 |
| WNS20-1.25-Y(Q) | 20 | 1.25 | 194 | 8.3×3.4×4.0 |
| WNS20-1.6-Y(Q) | 20 | 1.6 | 204 | 8.3×3.4×4.0 |
Gas Fired Steam Boiler Protection System
Water Level Protection
The steam boiler is equipped with two pumps for operation and backup. Boiler supporting one to two plate-type water level meters, should often be compared with each other, found inconsistent instructions, should be corrected immediately. The gauge shall be flushed every shift to determine its true level. At the same time, it is also equipped with electrode point water level balancing cylinder, which can accurately collect water level signal to send alarm or control the feed water pump.
Pressure Protection
When the boiler pressure exceeds the rated value, interlocking protection shall be carried out: the method is to stop the furnace and the combustion system to stop working; Can also change the nozzle, single or double stage combustion, can also adjust the amount of oil, thereby reducing pressure, to ensure safe operation of the boiler. The pressure protection of oil-fired (gas) steam boiler is the same as the water level with multiple protection.
Temperature Protection
Temperature protection is an important procedure in the safe operation of boiler, especially for the regulation and protection of steam boiler temperature. At the same time in the hot water boiler overtemperature to achieve regulatory protection. The commonly used temperature protection device of boiler is bimetallic temperature controller.
Flameout Protection
Prevent the occurrence of events of the chamber of a stove or furnace, fuel (gas) boiler must be set flame-out protection device, the function is to monitor the burning in the hearth conditions (including the ignition, when the ignition failure or burns out midway, generally in 5 seconds to ignition, running within 1 second, electromagnetic valve, close the oil (gas) and connect and send out sound and light alarm signal, and then air blower work, purging residual of combustible gas in the chamber of a stove or furnace, after 20 ~ 30 seconds of purging, automatically cut off the blower and various kinds of auxiliary power supply, stop running of boiler.) It consists of a flame monitor and a control device. The purpose of the flame monitor is to signal the presence or interruption of the flame by the control device. Photomultiplier tubes, photosensitive resistors and photocells are mainly used. They all have ultraviolet or infrared type, a photoelectric conversion element, which works by converting the intensity of the light radiation into the corresponding intensity of the current. And linear state output, sometimes the induced current is weak, through amplification, to the controller can produce effect.
Blackout Self – lock Protection
In the case of sudden interruption of power supply, the boiler will stop self-locking immediately. If the current is restored to power, start at any time. The self-locking must be reset and removed to restart the ignition.
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