Unlock instant, AI-driven research and patent intelligence for your innovation.

Cleaning method of nickel plate heat exchanger

A heat exchanger, nickel plate technology, applied in the field of cleaning, can solve the problems of poor heat exchange effect, reduced heat exchange area, scale residue, etc., to achieve the effects of easy purchase and storage, simple operation, and simple equipment

Active Publication Date: 2017-04-05
攀枝花攀西蓝星化学清洗有限公司
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the plates of nickel plate heat exchangers are made of nickel, and the cooling medium is water. After a period of use, scaling will occur, resulting in reduced heat transfer area and poor heat transfer effect.
The usual treatment is to disassemble the heat exchanger for cleaning, but the disassembly and cleaning can only be carried out when it is stopped, which will affect the use and cause the loss of the gasket
At the same time, if the physical cleaning method is not clean, there will be scale residues. Now some use the chemical cleaning method, which requires a professional company to analyze and formulate a professional plan, which is time-consuming and expensive.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0015] In July 2013, the nickel plate heat exchanger (model BRO.28DW-0.6~29.4-E-1) was severely scaled, and the temperature could not drop down to 95°C. At least 300,000 direct losses. Then adopt the inventive method to carry out on-line cleaning:

[0016] Step a alkali washing: the mass fraction of sodium hydroxide in the solution used is 1.5%, the mass fraction of sodium nitrite is 0.13%, and the mass fraction of sodium tripolyphosphate is 2.5%. The principle is to clean the circulating water side of the nickel plate heat exchanger for 4 hours. During the cleaning process, measure the concentration every 30 minutes. If the concentration decreases, add drugs to keep the concentration constant. After washing, drain the remaining material;

[0017] Step b pickling: the mass fraction of oxalic acid in the solution used is 6.4%, the mass fraction of corrosion inhibitor is 0.25%, and the temperature is 36°C. After the medicine is prepared, it is cleaned with a pickling device for...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a washing method, in particular relates to a method for washing a nickel plate type heat exchanger, and aims at providing a method for washing nickel plate type heat exchangers. The method comprises four steps, namely, alkaline washing, acid washing, water washing and passivation, wherein a solution used in alkaline washing comprises the following components in percentage by mass: 1-2% of sodium hydroxide, 0.1-0.2% of sodium nitrite and 2-3% of trisodium tripolyphosphate; a solution used in acid washing comprises the following components in percentage by mass: 6-7% of mesoxalic acid and 0.25-0.27% of a corrosion inhibitor; a solution used in passivation comprises the following components in percentage by mass: 4-5% of trisodium tripolyphosphate and 0.2-0.3% of sodium sulfite. The method can be performed on line, does not affect the use, is small in device investment, can be used repeatedly, does not corrode the heat exchanger, does not consume a gasket, and is relatively high in economical efficiency.

Description

technical field [0001] The invention relates to a cleaning method, in particular to a cleaning method for a nickel plate heat exchanger. Background technique [0002] At present, the plates of nickel plate heat exchangers are made of nickel, and the cooling medium is water. After a period of use, scaling will occur, resulting in reduced heat exchange area and poor heat exchange effect. The usual treatment is to disassemble the heat exchanger for cleaning, but the disassembly and cleaning can only be carried out when it is out of use, which will affect the use and cause the loss of the gasket. At the same time, if the physical cleaning method is not clean, there will be scale residues. Now some use the chemical cleaning method, which requires a professional company to analyze and formulate a professional plan, which is time-consuming and expensive. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a cleaning method...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/20C23G1/10C23G1/04C23G1/24C23C22/23
CPCC23C22/23C23G1/04C23G1/10C23G1/20
Inventor 刘澜涛尹文刚宋得锦王海军
Owner 攀枝花攀西蓝星化学清洗有限公司