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DL/T 805.4-2016

Chinese Standard: 'DL/T 805.4-2016'
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DL/T 805.4-2016
ICS 27.100
F 23
Registration number. 53991-2016
Replacing DL/T 805.4-2004
Guideline for cycle chemistry in fossil plants -
Part 4. Feedwater treatment
第 4部分. 锅炉给水处理
Issued by. National Energy Administration
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 General ... 6 
5 Water treatment methods ... 7 
6 Testing methods ... 9 
7 Feedwater dosing ... 10 
8 Feedwater quality at boiler startup ... 11 
9 Treatment when the water quality is degraded ... 12 
DL/T 805 “Guideline for cycle chemistry in fossil plants” is divided into 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 is the fourth part of the DL/T 805. As compared with DL/T 805.4-2004,
except for editorial changes, the main contents of this revision are as follows.
- DELETE ORP terms that are not easily measured accurately.
- ADD testing provisions for chloride ions in feedwater.
- ADD testing provisions for TOCi in feedwater.
- MODIFY the indicators such as hydrogen conductivity, pH, iron, copper and
sodium content.
- DELETE the treatment method of OT in the feedwater to the drum boiler
having a superheated steam pressure at 12.7 MPa ~ 15.6 MPa.
- ADD the hydrogen conductivity index of feedwater at the start of boiler.
This part was written in accordance with the requirements of GB/T 1.1-2009.
This part was proposed by the China Electricity Council.
This part shall be under the jurisdiction of the Power Industry Electrical
Chemical Standardization Technical Committee.
Drafting organizations of this part. Xi’an Thermal Power Research Institute Co.,
Ltd., Jilin Electric Power Co., Ltd. Electric Power Research Institute.
The main drafters of this part. Sun Benda, Zhang Weike, Wang Jiusheng.
This part was first released in October 2004 and this is the first revision.
The comments or suggestions on this part in the implementation process are
fed back to the China Electricity Council Standardization Management Center
(Beijing Baiguang Road Lane 2 No.1, 100761).
Guideline for cycle chemistry in fossil plants -
Part 4. Feedwater treatment
1 Scope
This part of the DL/T 805 gives the principles and control indicators for the
treatment of feedwater during operation and startup of thermal generator set.
This part of DL/T 805 is applicable to the feedwater treatment of the steam drum
boilers with superheated steam pressures of 3.8 MPa (gauge pressure) and
above as well as the direct flow boilers of 5.9 MPa (gauge pressure) and above.
This part of the DL/T 805 does not apply to the feedwater treatment of gas-
steam combined cycle units.
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 standard.
GB 536 Liquid anhydrous ammonia
GB/T 631 Chemical reagent - Ammonia
GB/T 6904 Water used in industrial circulating cooling system and boiler -
Determination of pH
GB/T 6906 Methods for analysis of water for boiler and for cooling - The
determination of hydrazine
GB/T 6909 Analysis of water used in boiler and cooling system -
Determination of hardness
GB/T 12149 Water for industrial circulating cooling system and boiler -
Determination of silica
GB/T 12155 Analysis of water used in boiler and cooling system -
Determination for sodium - Dynamic method
GB/T 13689 Water for industrial circulating cooling system and boiler -
Flow-accelerated corrosion (FAC)
Under specific conditions, the fast corrosion of carbon steel in high speed
water flow.
Feed water system without copper alloys
The feedwater system whose components and equipment coming into
contact with the boiler feedwater do not contain copper or copper alloy.
Note. Metal materials contain less than 1% copper and are considered
copper-free materials.
Feed water supply system with copper alloys
The feedwater ......
Related standard:   DL/T 805.2-2016  DL/T 805.3-2013
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