Issues that need attention when modifying gas steam generators

Gas boilers not only have lower installation and operating costs, but are more economical than coal boilers; natural gas is the cleanest fuel and the fuel that emits the least pollution, which is both energy-saving and environmentally friendly.

8 issues that should be paid attention to during the renovation of gas boilers:
1. The smooth flow of flue gas should be ensured.
2. The burner should be set at the center height of the furnace with sufficient combustion space and length.
3. Insulate the exposed parts in the furnace, and control the smoke temperature at the entrance of the tube plate of the fire tube boiler to prevent tube plate cracks.
4. The furnace walls of various water pipes and water-fire pipe gas boilers are basically built with refractory bricks, plus insulation materials and protective panels.

5. The furnace of a coal-fired boiler is generally larger than that of a gas-fired boiler, with sufficient combustion space. After modification, the gas volume can be increased without affecting the combustion conditions.
6. During the renovation, the slag tapping machine chain grate, gearbox and other equipment of the coal-fired boiler will be removed.
7. Through the heat transfer calculation of the furnace, determine the geometric size of the furnace and the center position of the furnace flame.
8. Install explosion-proof doors on steam boilers.

Analysis of the advantages of gas boilers:

(1) Since the ash, sulfur content and nitrogen content in gas are lower than those in coal, the amount of dust in the flue gas produced after combustion is very small, and the flue gas emitted can easily meet the national requirements for combustion equipment. standards. Using gas boilers can greatly reduce environmental pollution.

(2) The furnace volume thermal intensity of the gas steam boiler is high. Due to the small flue gas pollution, the convection tube bundle is not corroded and slagging, and the heat transfer effect is good. The combustion of gas produces a large amount of radiation of triatomic gases (carbon dioxide, water vapor, etc.) It has strong capacity and low exhaust gas temperature, which significantly improves its thermal efficiency.

(3) In terms of saving investment in boiler equipment

1. Gas boilers can use higher furnace heat loads to reduce the furnace volume. Since there are no problems such as contamination, slagging, and wear of the heating surface, a higher smoke velocity can be used to reduce the size of the convection heating surface. By rationally arranging the convection tube bundle, the gas boiler has a compact structure, smaller size and lighter weight than the coal-fired boiler with the same capacity, and the equipment investment is significantly reduced;
2. Gas boilers do not need to be equipped with ancillary equipment such as soot blowers, dust collectors, slag discharge equipment and fuel dryers;
3. Gas boilers use gas transported by pipelines as fuel and do not require fuel storage equipment. There is no need for fuel processing and preparation equipment before supply for combustion, which greatly simplifies the system;
4. Since there is no need for fuel storage, transportation costs, space and labor are saved.

(4) In terms of operation, adjustment and reduction of heating costs
1. The heating load of the gas boiler is highly adaptable and can be adjusted flexibly within the system. 2. The system starts quickly, reducing various consumption caused by preparation work.
3. Since there are few ancillary equipment and no fuel preparation system, the electricity consumption is lower than that of coal-fired boilers.

4. There is no need for heating fuel and steam for fuel drying, so the steam consumption is small.
5. There are less impurities in the gas, so the boiler will not be corroded at high or low temperature heating surfaces, and there will be no slagging problem. The boiler will have a long continuous operation cycle.
6. Gas measurement is simple and accurate, making it easy to adjust the gas supply.

【Precautions】

How to choose a boiler: 1 check 2 see 3 verify

1. Remember to drain the boiler once after 30 days of use;
2. Remember to check whether the boiler needs cleaning after 30 days of use;
3. Remember to check whether the boiler needs cleaning after 30 days of use;
4. Remember to replace the exhaust valve when the boiler is used for half a year;
5. If there is a sudden power outage while the boiler is in use, remember to take out the coal;
6. The boiler induced draft fan and motor are prohibited from being exposed to rain (rain-proof measures must be taken if necessary).