DL/T 805.2-2016Guideline for Cycle Chemistry in Fossil Plants - Part 2: Phosphate Treatment for Drum Units (English PDF)

Foreword

DL/T 805 Guideline for Cycle Chemistry in Fossil Plant can be divided into the following

5 parts.

--- Part 1. Oxygenated Treatment for Feed-Water System of Boiler;

--- Part 2. Phosphate Treatment for Drum Units;

--- Part 3. Caustic Treatment for Drum Units;

--- Part 4. Feedwater Treatment;

--- Part 5. All Volatile Treatment for Drum Units.

This Part belongs to Part 2 of DL/T 805. Compared with DL/T 805.2-2004, this Part

has the major revisions as follows besides the editorial modifications.

--- Modify the pressure rating of the boiler steam drum in the phosphate treatment;

--- Modify the definition of the low phosphate treatment.

--- Delete the coordinated pH-phosphate treatment (CPT);

--- Delete the water quality indicators of the boiler water treatment related to the

segmented evaporation boiler;

--- Modify the boiler water quality indicator during the phosphate treatment (PT);

--- Modify the boiler water quality indicators during the low phosphate treatment

(LPT);

--- Delete the equilibrium phosphate treatment (EPT);

--- Modify the flow chart for selecting the boiler water treatment of steam drum boiler;

--- Modify the treatment value when the boiler water quality is abnormal.

This Standard was drafted as per the rules specified in GB/T 1.1-2009.

This Part was proposed by China Electricity Council.

This Part shall be under the jurisdiction of Technical Committee for Standardization of

Power Plant Chemical of Power Industry.

Chief drafting organizations of this Part. Xi'an Thermal Power Research Institute Co.,

Ltd., and Jilin Electric Power Research Institute Co., Ltd.

Guideline for Cycle Chemistry in Fossil Plants -

Part 2. Phosphate Treatment for Drum Units

1 Scope

This Part of DL/T 805 gives the conditions, principles and control indicators for the

boiler water phosphate treatment in fossil plant.

This Part is applicable to the boiler water treatment of steam drum boiler with steam

drum pressure of 3.8MPa~18.3MPa in the fossil plant.

2 Normative References

The following documents are essential to the application of this document. For the

dated documents, only the versions with the dates indicated are applicable to this

document; for the undated documents, only the latest version (including all the

amendments) are applicable to this document.

GB/T 6904 Water Used in Industrial Circulating Cooling System and Boiler -

Determination of Ph

GB/T 6908 Analysis of Water Used in Boil and Cooling System-Determination of

Electrical Conductivity

GB/T 6913 Analysis of Water Used in Boiler and Cooling System - Determination

of Phosphorus

GB/T 12146 Analysis of Water Used in Boil and Cooling System – Determination

of Ammonia - Phenol Method

GB/T 12149 Determination of Silica in Water for Industrial Circulating Cooling

System and Boiler

GB/T 15453 Water for Industrial Circulating Cooling System and Boiler-

Determination of Chloride

DL/T 954 Analysis of Water and Steam in Fossil Fuel Power Plant Determination

of Fluoride Acetate Formate Chloride Nitrite Nitrate Phosphate and Sulfate by Ion

Chromatography

DL/T 1115 Guide for Chemistry Check - up of Unit Maintenance in Fossil Fuel

Power Plant

3 Terms and Definitions

The following terms and definitions are applicable to this Part of DL/T 805.

4 Role and Usage Conditions

10 Treatment Measures when the Quality of the Boiler

Water Deteriorates