GB/T 36699-2018Specification for liquid fuels and gaseous fuels burners of boilers (English PDF)

3.1 Forced draught burner

The burners that are required to burn all of the air provided by the blower.

3.2 Natural ventilation burner

The burners that are required to burn all of the air sucked into the furnace under negative-pressure.

3.3 Liquid-fuel

A liquid flammable substance that generates heat when burned.

Note: The liquid-fuels referred to in this standard include fuels such as light oil, heavy oil, alcohol-based fuel, bio-oil.

3.4 Bio-oil

A liquid-fuel which is refined from biomass.

3.5 Gaseous-fuel

A gaseous combustible substance that generates heat when burned.

Note: The gaseous-fuels referred to in this standard include natural gas, liquefied petroleum gas, coke-oven gas, mixed city gas, bio-gas, low-calorific-value gas, combustible industrial tail-gas, hydrogen gas, methane.

3.6 Biomass pyrolysis gas

A low-calorific-value combustible gas produced by a pyrolysis process of a biomass solid fuel.

4.1 Classification

The burners are divided according to the type of fuel used, the mode of adjustment, the mode of air supply, the method of atomization, the type of structure, as follows. […]

4.2 Preparation of model

4.2.1 The burner's product model generally consists of four parts, each of which is connected by a short horizontal line, as shown in Figure 1.

4.2.2 The code of each part of the burner's product model shall comply with the following provisions.

4.2.3 Example of models.

a) For a company's H series gaseous-fuel burner which uses natural gas as fuel, mechanical modulating control mode, natural ventilation, nominal heat output of 2.0 MW, the model is identified as H-QMN-2.0;

5.1 Composition

5.1.1 The burner consists of a burner body, an air supply system, a fuel supply system, an ignition device, a safety protection system, a load control system.

5.1.2 The burner body consists of components such as the burner head and the casing.

5.1.3 The air supply system consists of a fan, air duct, air-flow control device.

5.1.4 The fuel supply system consists of the following. electrode.

5.1.6 The safety protection systems consists of the following.

5.1.7 The load control system consists of a servo motor, a mechanical linkage device or an electronic proportional control device, etc.

5.2 Basic configuration

5.2.1 Basic requirements

The configuration of the burner is related to factors such as fuel type and combustion mode. The basic configuration is as shown in Appendix A.

5.2.2 Automatic safety shut-off valve of liquid-fuel

5.2.2.1 For liquid-fuel burners which have a nominal heat output <= 400 kW, the automatic safety shut-off valve shall be arranged in accordance with the requirements of Figure B.1 ~ Figure B.4 in Appendix B. The specific requirements are as follows. […]

5.2.3 Automatic safety shut-off valve for gaseous-fuel

The configuration of the automatic safety shut-off valve for gaseous-fuel shall meet the following requirements. […]

5.2.4 Flame detector device

The arrangement of the flame detector device shall meet the following requirements. […]

5.2.5 Air monitoring device

The burner shall be fitted with an air monitoring device, that monitors the air-flow through pressure monitoring, flow monitoring, other measurement methods that reflect the supply air status.

5.2.6 Valve leak detector

A gas leak detector which has a nominal heat output greater than 1200 kW shall be provided with a valve leak detector.

6.1 Declaration of conformity

This standard has been developed in accordance with the basic safety requirements for the liquid-fuel burner and the gaseous-fuel burner in TSG G0001.

6.2 Manufacturing organization

The manufacturing organization of the burner shall meet the following conditions simultaneously.

6.3 Professionals

Professionals involved in such trades as manufacture, installation, commissioning, repair, modification of burners shall have expertise in thermal energy and electrical control, be familiar with the operation and commissioning process.

6.4 Type test

6.4.1 Burners shall be subjected to the type test under one of the following conditions.

6.4.2 The type test shall be carried out by an inspection and testing institute which has the type test qualification of burner as approved by the State Special Equipment Safety Supervision Department.

6.5 Inspection after in-service burner modification

After the modification of the in-service burner, it shall be inspected. The inspection institute shall have the corresponding metrological certification qualification.

7.1 Safety requirements

7.1.1 Startup

The startup of the burner shall meet the following conditions. […]

7.1.2 Pre-purge

7.1.2.1 The furnace shall be purged before the ignition device is energized.

7.1.2.2 The pre-purge time and the pre-purge air-volume shall meet the following requirements.

7.1.2.3 The pre-purge time of the dual-fuel burner shall be in accordance with the requirements of 7.1.2.2 d) gaseous-fuel burners.

7.1.3 Post-purge

Immediately after the controlled shut-down of the burner, it shall carry out purging. The purge time shall comply with the requirements of Table 7.

7.1.4 Safety time

7.1.6 Ignition of ignition burner

7.1.6.1 The ignition of the liquid-fuel shall meet the following requirements. […]

7.1.8 Restart

7.1.8.1 Failure in the pre-purge phase

When an air-flow failure occurs in the pre-purge phase of the gaseous-fuel burner, it shall make safety shut-down and take interlock protection. However, for a burner which has a heat output less than or equal to 120 kW, it allows one restart after a safety shutdown. If the restart fails, it shall make safety shut-down and take interlock protection.

7.2 Electrical safety

7.2.1 Electrical equipment's safety shall meet the requirements of GB 19517, the electrical safety shall be implemented in the order of direct safety measures, indirect safety measures, suggestive safety measures.

7.2.2 In order to ensure the normal operation and prevent the danger caused by the direct action of the current, the electrical equipment shall have sufficient insulation resistance, dielectric strength, heat resistance, moisture resistance, anti-fouling, flame retardancy, tracking resistance.

7.2.3 All parts that may be hazardous due to operating voltage, fault current, leakage current or the like shall have sufficient electric clearance and creepage distance.

7.2.4 Electrical equipment shall have sufficient mechanical strength, good enclosure protection, corresponding stability, suitable-for-transportation structure. The external conductive parts shall be reliably grounded, the grounding resistance is less than or equal to 4 ohm.

7.2.5 Basic characteristics, wiring, implemented standards shall be clearly and permanently marked on the product. If they cannot be marked on the product, they shall be marked on the package or described in the instruction manual.

7.2.6 The electrical safety of the connection between the burner and the control device shall comply with the relevant requirements of GB/T 14536.1, IEC 60335-2-102, GB/T 30597.

7.3 Requirements of operation

7.3.1 Ignition, operation, flame stability

The ignition, operation, flame stability of the burner shall meet the following requirements. […]

8.1 General requirements

The burner shall be designed to meet the following requirements. […]

8.2 Connection and sealing

The connection between the burner's components and between the burner and the boiler shall comply with the following requirements. […]

8.3 Main components

8.3.1 Automatic controller

The automatic controller shall comply with the relevant requirements of GB/T 14536.6 and meet the following requirements. […]

8.3.2 Motors, fans and moving parts

Motors, fans and moving parts shall be provided with protective covers or protective nets. The performance of the motor and fan shall meet the following requirements. […]

8.3.3 Air monitoring device

The air monitoring device shall meet the following requirements. […]

8.3.4 Air-flow control device

The air-flow control device shall meet the following requirements. […]

8.3.5 Fuel-flow control device

The fuel-flow control device shall be able to accurately adjust within the design pressure range, the fuel-flow is stable and reliable. At the same operating point during the upward and downward movement of the control device, the fuel-flow shall be repeatable.

8.5 Assembly

The assembly of the burner shall meet the requirements of the technical documents. All the connections and linkages of the burner shall be flexible and reliable, there shall be no jamming. The installation position of each component shall be correct and reliable.

8.6 Appearance

The decorative surface finish of the burner's casing surface shall be complete, uniform, smooth, there shall be free from scratch or peeling-off.

9.1 Alcohol-based fuel burner

9.1.1 Requirements of design and installation

The design of alcohol-based fuel burners shall meet the following requirements in addition to the general requirements for liquid-fuel burners.

9.1.2 Requirements of use

Alcohol-based fuel burners shall use the alcohol-based fuels that meet the requirements of GB 16663. It shall adjust an appropriate air-fuel ratio, to ensure that the alcohol-based fuel is fully combusted, the original emission meets the requirements in Table 12. Meanwhile it shall prevent the generation of pollutants such as aldehydes.

9.2 Biomass pyrolysis gas burner

In addition to meeting the general requirements for gaseous-fuel burners, the design of biomass pyrolysis gas burners shall also meet the following additional requirements.

9.3 Surface burner

9.3.1 Design requirements

In addition to complying with the general requirements for gaseous-fuel burners, surface burners shall also meet the following requirements. […]

9.3.2 In-use maintenance

Surface burners shall meet the following requirements when used.

9.4 Natural ventilation burner

In addition to the general requirements for gaseous-fuel burners, natural ventilated burners shall also meet the following requirements when used on boilers which have enclosed combustion chambers. […]