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DL/T 435-2018 English PDF (DLT435-2004, DL435-1991)

DL/T 435-2018_English: PDF (DL/T435-2018)
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
DL/T 435-2018English1199 Add to Cart 7 days [Need to translate] (Power plant boiler furnace explosion-proof regulations) Valid DL/T 435-2018
DL/T 435-2004English150 Add to Cart 0--9 seconds. Auto-delivery Code for the prevention of pulverized coal firing furnace explosions/implosions in power plant boilers Obsolete DL/T 435-2004
DL 435-1991EnglishRFQ ASK 3 days [Need to translate] (Pulverized coal combustion boiler thermal power plant explosion regulations) Obsolete DL 435-1991


BASIC DATA
Standard ID DL/T 435-2018 (DL/T435-2018)
Description (Translated English) (Power plant boiler furnace explosion-proof regulations)
Sector / Industry Electricity & Power Industry Standard (Recommended)
Word Count Estimation 52,555
Date of Issue 2018-12-25
Date of Implementation 2019-05-01
Older Standard (superseded by this standard) DL/T 435-2004
Regulation (derived from) National Energy Administration Announcement No.16 of 2018

BASIC DATA
Standard ID DL/T 435-2004 (DL/T435-2004)
Description (Translated English) Code for the prevention of pulverized coal firing furnace explosions/implosions in power plant boilers
Sector / Industry Electricity & Power Industry Standard (Recommended)
Classification of Chinese Standard F23
Classification of International Standard 27.100
Word Count Estimation 26,219
Date of Issue 2004-03-09
Date of Implementation 2004-06-01
Older Standard (superseded by this standard) DL/T 435-1991
Drafting Organization National Electric Power Research Institute
Administrative Organization Power industry boiler Standardization Technical Committee
Regulation (derived from) National Development and Reform Commission Notice 2004 No. 16
Summary This standard specifies the outside to prevent the pulverized coal power plant boiler furnace explosion/implosion equipment and systems in the relevant basic requirements, given the equipment start and stop the operation of the order and operation guide. This standard applies to pulverized coal power plant boilers.

BASIC DATA
Standard ID DL 435-1991 (DL435-1991)
Description (Translated English) (Pulverized coal combustion boiler thermal power plant explosion regulations)
Sector / Industry Electricity & Power Industry Standard
Date of Issue 1991/9/18
Date of Implementation 1992/3/1


DL/T 435-2004 DL ELECTRICAL POWER INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 27.100 F 23 Recording number. 13556-2004 Replacing DL/T 435-1991 Code for the Prevention of Pulverized Coal Firing Furnace Explosion/Implosions in Power Plant Boilers ISSUED ON. MARCH 9, 2004 IMPLEMENTED ON. JUNE 01, 2004 Issued by. National Development and Reform Commission Table of Contents Foreword ... 3  1 Scope ... 4  2 Terms ... 4  3 Relevant Requirements on the Prevention of Furnace Explosions ... 9  Appendix A ... 44  Appendix B ... 46  Appendix C ... 47  Foreword According to the Document Zong Ke Jiao [1998] No.18 issued by the previous Ministry of Power Industry "Notice on issuing the Development and Revision Plan of Professional Power Standards", this Code is revised based on DL 435-1991 "Code for Prevention of Pulverized Coal Firing Boiler Firebox Explosion/implosions in Thermal Power Plant". There have been some significant changes in this Code over its previous editions in the following technical aspects. - MODIFY specified value of the furnace structural design pressure; - ADD terms; - ADD content on preventing furnace implosions; - MAKE new supplement on the provisions of relevant equipment and their system requirements as well as the running operations; - ADD Informative Appendix “Reasons that may cause furnace explosion” (Appendix A); - ADD Informative Appendix “Explanation on the transient state pressure-bearing capability designed for the furnace” (Appendix B); - ADD normative appendix “Fuel trip time delay and additional alarm items” (Appendix C). This Code replaces DL 435-1991 since its implementation. Appendix A and Appendix B of this Code are informative. Appendix C of this Code is normative. This Code was proposed by China Electricity Council. This Code shall be under the jurisdiction and under the explanation of Technical Committee for Standardization on Professional Power Plant Boilers. This Code was drafted by Thermal Power Research Institute. This Code was mainly prepared by Zheng Zemin, Gao Hanxiang, Yuan Ying and Xu Chuankai. This Code was first-time issued on September 18, 1991. Code for the Prevention of Pulverized Coal Firing Furnace Explosion/Implosions in Power Plant Boilers 1 Scope This Code specifies basic requirements on relevant equipment and system aspects for prevention of pulverized coal firing furnace explosions/implosions in power plant boilers, shows out guide for the on/off sequence and operation of equipment. This Code is applicable to pulverized coal firing furnace in power plant boiler. 2 Terms For the purposes of this Standard, the following terms apply. 2.1 main primary air shut off gate It is a kind of main air gate which can be closed tightly and prevent the primary air entering the burners; generally, it shall be mounted on the pulverized coal-free airflow, such as primary air fan outlet of positive pressure direct-blow pulverized-coal system or coal pulverizer inlet of negative pressure direct-blow pulverized-coal system and storage pulverized-coal system. 2.2 flame detector The equipment to detect the flame-free and provide signal. 2.3 directional blocking A sort of interlock system moves to the likely-to-be enlarged deviation direction and all the relevant final control elements must be prohibited when the furnace pressure is tested to deviate from the normal value significantly. 2.4 fan test block capability 2.11 ignitor It can provide adequate ignition energy for igniting the permanent devices (including sparker, igniting oil and popgun) of the main burner fuel for an instant. The capacity of the ignitor as close relationship with the fire behavior of the main fuel, burner type and requirement for the ignitor function, generally, it consists of Class-I and Class-II ignitors. Class-I ignitor. used to ignite the gas-pulverizer mixture entering the furnace from the main burner in any operating condition. This type of ignitor requires large capacity; generally, it shall be over 20% of the heat quantity of the main burner under full-load. Class-II ignitor. can only be used to ignite the gas-pulverizer mixture entering the furnace from the main burner according to the air volume and pulverized coal volume when igniting, its capacity is generally 10%~20% of the heat quantity of the main burner under full-load. The above two ignitors are both be used for combustion-supporting under low-load or when the burning is instable, however, it may not be used as means for saving extinguishment when the furnace has been fire-extinguishing but not yet been purged according to the requirements. 2.12 warm-up oil gun It is the oil gun for warming up boiler, lifting pressure, washing pipe and with low-load, while its thermal power hereof is larger than that of the ignitor (usually, its total thermal power is about 30% of the thermal power for the full-loaded boiler). 2.13 furnace safety supervisory system (“FSSS” for short) It is a kind of security protection and sequential control equipment that ensures that the equipment of the boiler combustion system is safety on/off according to the specified working order and conditions, and that can rapidly cut off all the fuel (including igniting fuel) entering the furnace in critical operating conditions, so as to prevent destructive emergencies like deflagration and explosions. Note. The primary functions of the international so-called “burner management system”, “fuel-firing safety system” or “burner control system” are identical to FSSS defined by this Code. 2.14 logic portion stable flame In the range of operation, and in the process of changing the load with the specified maximal variable rate, the boiler may maintain its stable-burning flame continuously. 2.21 burner The equipment supplies the fuel and air into the furnace according to the required velocity, turbulence and concentration, and makes the fuel be on fire and burnt stably in the furnace. 2.22 burner shutoff damper The shutoff damper loaded in front of the burners, used to shutoff the fuel-air mixture entering the main burner. 2.23 combustion control system Self-control the fuel and air flow and furnace pressure entering the furnace, so as to make the boiler maintain proper air -fuel-ratio in the specified load range, and ensure the flame stabilization and favorable fuel combustion governing system in the boiler, as well as maintain the furnace pressure in the prescribed range. 2.24 pulverized coal firing furnace purge Purge the boiler furnace with blowing fan and induced draft fan in constant mass air flow when the boiler load is no less than 25% and not more than 40% of the boiler full-load, while the time depends on the larger value between the following two. a) No less than 5min; b) Make 5 times of air change for the furnace and space of its backside pressure-containing members. 2.25 furnace explosions Pulverized coal, oil mist, fuel and air mixture is accumulated in the furnace or the restricted clearance of the backside flue attached to the furnace; when the concentration of these mixtures is within the deflagration limit range, it may deflagrate judgments, and to avoid the unsafe operating conditions. 3.2 Requirements on the Corresponding System of the Equipment 3.2.1 Structural design of the furnace The structural design of the furnace requires. a) The furnace structure shall be able to bear transient pressure emergent in improper conditions; under this pressure, the furnace shall not bend or yield by any supporting parts, which may result in the permanent deformation. b) The design transient pressure of the furnace shall not be less than ±8.7kPa (related explanation refers to Appendix B). Note. For the boiler with capacity of 4000h (equivalent to boiler of 100MW unit) or below, the absolute value for the design transient pressure of the furnace may be less than 8.7kPa, but it should not be less than 6.7kPa. c) Whatever the reasons, when the fan test block capability exceeds -8.7kPa, the design transient negative pressure of the furnace shall be considered to be increased. 3.2.2 Smoke duct design Smoke duct design requires. a) From the blowing fan outlet to the ducts and flues of the chimney, the pressure endured by the duct, when the furnace withstands the transient design pressure during the design process, shall be considered. b) If the tail of flue gas is mounted with desulfurization equipment and fitted with booster fan, then effective measures shall be taken to prevent the furnace withstanding the superimposed pressure head of the induced draft fan and the booster fan. 3.2.3 Supply system of the raw coal The supply system of the raw coal requires. a) The coal for the thermal power plant is in over two co-firing, measures for coal mixing shall be available, so as to ensure that the coal enter the raw coal silo is the mixed coal. b) In the bunkering system from the coal yard to the raw coal silo, sundries ... ......

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