CN102519300B

CN102519300B - Method for chemically and circularly cleaning scale inside and outside pipes of evaporating tank and heater in the sugar factory

Info

Publication number: CN102519300B
Application number: CN 201110403514
Authority: CN
Inventors: 刘沣
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-12-07
Filing date: 2011-12-07
Publication date: 2013-05-15
Anticipated expiration: 2031-12-07
Also published as: CN102519300A

Abstract

The invention belongs to a method for cleaning chemical evaporating and heating equipment, in particular to a method for chemically and circularly cleaning the scale inside and outside pipes of an evaporating tank and a heater in the sugar factory. The method is characterized in that the evaporating tank is filled with water, a spraying nozzle is arranged above a gas drum of the evaporating tank and communicated with an outlet of an iron casting clean water pump, a syrup outlet at the bottom of the evaporating tank is communicated with an upper gas drum interface, a lower gas drum interface is communicated with the inlet of the heater, the inlet of the heater is lower than the liquid level in the evaporating tank, the outlet of the heater is communicated with the inlet of a steam chamber, the outlet of the steam chamber is communicated with the inlet of a water pump through a pipe, a venture pipe which is communicated with a sampling basin is connected beside the pipe, hydrochloric acid is filled into the sampling basin, the water pump is started so that the concentration of the hydrochloric acid in cleaning solution is controlled at 0.2-0.5%, and the production velocity of gas from reaction is controlled to be lower than the flow velocity of the liquid in the pipe so that the gas overflows from the inlet of the evaporating tank. The method is easy to operate by consuming least time and labor, adopts the equipment with low investment and can be used for cleaning the scale inside and outside the pipes of the evaporating tank and the heater so that the water in a boiler contains no impurity.

Description

The inside and outside fouling chemical cycle cleaning method of sugar refinery evaporator and heater tube

Technical field

The invention belongs to the inside and outside fouling chemical cycle cleaning method of cleaning facility, particularly sugar refinery evaporator and heater tube of chemical industry evaporation firing equipment.

Background technology

Present domestic sugar refinery is in operation, and the inside and outside wall of the hot device Re of evaporator and Jia Jiao Change pipe can produce a large amount of incrustation with production process, badly influences rate of heat exchange.Sugar refinery is because the existence of incrustation and dealing with improperly, and its production efficiency has been lost about 40～50 ℅, that is to say that fermented glutinour rice (alcohol) tower incrustation is processed well, just can make up this part loss if to boiler, heater, the evaporator in sugar refinery.In a word, the incrustation of sugar mill equipment is perplexing the production in sugar refinery, causes productivity ratio low, the having some setbacks of the high and production technology of cost; During season was pressed in sugar refinery, boiler must guarantee uninterrupted steam supply and the bagasse that burns, and incrustation has caused the too much waste of this precious resources of bagasse, and CO2 emissions are surged, and does not conform to the national environmental protection theory of current energy-saving and emission-reduction.

The conventional method of removing evaporator incrustation is to adopt high-pressure spray gun, inserted by manually-operated to spray in the heating tube that gathers on card and remove, during operating cost, effort, cost of equipment is higher, and often there are many heating tubes to be missed in cleaning process, high-pressure spray gun can not clean the outer incrustation of heating tube in addition, can not the inside and outside wall of Re Jiao Change pipe of heater be cleaned.

In order to solve over the problem that the sugar dirt of sugar refinery evaporator exists in cleaning, the applicant has proposed the patent application of " cyclic cleaning method of calcium dirt and scavenger " (application number 91105475.8) in 1991, this technical scheme has solved preferably the high-pressure spray gun ablution and has omitted the problem that heating tube is cleaned, and the operation save time, laborsaving, deeply be subjected to the welcome in vast sugar refinery.But the applicant finds also to exist some significant problems not yet to solve in application for many years, and namely 1. this patented method and high-pressure spray gun ablution all can only clean the sugar dirt of the Re Jiao Change inside pipe wall gathering of evaporator, can't the incrustation on the pipe outer wall be cleaned; 2. can not clean the inside and outside wall incrustation to the hot device Re of Jia Jiao Change pipe simultaneously; 3. at present sugar refinery Pans stove enters stove water and mostly derives from 1#, 2# evaporator almost drum condensed water, the sugary steam of 1# evaporator is transfused to the heating of 2# evaporator almost drum, so the heat-exchange tube outer wall of 2# evaporator is all sticky a large amount of sugar dirt, when the rotation of 2# evaporator is used as the 1# evaporator, the clean power of high temperature Pure that is come by steam turbine steams almost and dissolves and dissolve in steam to the sticky sugar dirt of pipe outer wall, early also contain a large amount of saccharics so this steam drum vapour is doubted water, do not meet the working specification that the Pans stove enters stove water.

Summary of the invention

The purpose of this invention is to provide the inside and outside fouling chemical cycle cleaning method of a kind of improved sugar refinery evaporator and heater tube, its operation saves time, laborsaving, can clean fouling inside and outside the pipe of evaporator and heater, and can guarantee that the Pans stove enters stove water and do not contain impurity.

realize that the technical scheme that above-mentioned purpose of the present invention is taked is: the water of packing in evaporator, dress shower nozzle above the tympanites of evaporator, shower nozzle is communicated with the outlet of cast iron clarified water pump, syrup outlet at the bottom of evaporator is communicated with the upper interface of tympanites, the tympanites lower interface is communicated with the heater import, and the heater import is lower than liquid level in evaporator, heater outlet is communicated with the steam chest import, steam chest exports with pipeline communication pump entrance and the other Venturi tube that passes in succession the sampling basin of this segment pipe, the sampling hydrochloric acid of packing in basin, the starting water pump, make the hydrochloric acid weight concentration of cleaning fluid be controlled at 0.2～0.5%, and control reaction aerogenesis speed less than the pipeline liquid flow velocity, allow gas overflow from the evaporator manhole.

All dispose valve on each section connecting pipe of the present invention, control reaction aerogenesis speed less than the pipeline liquid flow velocity by control valve, whole scavenging period is 3～4 hours.Sampling is packed in basin and is also filled corrosion inhibiter if any macromolecule phenyl ring, heterocycle compositions of mixtures.

during starting mode of pump, Venturi tube can suck the salt acid scavenger in the sampling basin in water pump, be transported to continually the shower nozzle of evaporator by pipeline, be sprayed into evaporator, to cleaning in heat-exchange tube, the syrup of cleaning fluid at the bottom of the tank exports out, enter the upper interface of tympanites through piping, in tympanites to cleaning outside heat-exchange tube, again by enraged lower interface out, in evaporator under the Action of Gravity Field of difference in height, cleaning fluid enters the heater import, connection by pipeline, in pipe to whole heater, clean outward, complete in evaporator and heater tube, outer wash cycles.

The technical program can be cleaned a series of heaters, and its method of attachment is: the heater import of a heater after the steam chest outlet of last heater connects with pipeline, the steam chest outlet of top heater connects pump entrance with pipeline.

The beneficial effect of the invention is: 1. except can be to cleaning in the heat-exchange tube of evaporator, also can be to managing outer cleaning, and expand to can be simultaneously to the inside and outside cleaning of heater tube; 2. operation save time, laborsaving, clean thoroughly and effective, be not affected by human factors, can complete evaporator and the inside and outside whole wash cycles of heater tube in 3～4 hours; 3. equipment investment is few, processing ease; 4. can guarantee that evaporator almost drum condensed water that sugar refinery Pans stove enters stove reaches the requirement of pure water.

Description of drawings

Fig. 1 is apparatus arrangement schematic diagram of the present invention.

In figure: on syrup outlet 1, enraged lower interface 2, tympanites 3, shower nozzle 4, evaporator 5, manhole 6, tympanites, interface 7, pipeline 8, heater import 9, heater outlet 10, valve 11, steam chest import 12, No. 2 heaters 13, water pump 14, motor 15, Venturi tube 16, sampling basin 17, barrel 18, No. 1 heater 19, steam chests export 20.

The specific embodiment

Referring to Fig. 1, apparatus arrangement of the present invention is put this and is, shower nozzle 4 is equipped with in tympanites 3 tops of evaporator 5, and shower nozzle 4 connects water pumps 14 outlets by pipeline 8 through manhole 6, and when the state of cleaning, manhole 6 is in opening-wide state, is beneficial to the reaction product gas overflowing.The syrup outlet 1 use pipeline 8 of evaporator 5 bottoms connects the upper interface 7 of tympanites, and the cleaning fluid that makes out is then to the heat-exchange tube outer wall washing in tympanites 3.2 use the pipelines 8 connection heater imports 9 of tympanites lower interface, the height of heater import 9 are lower than liquid level in evaporator, and the cleaning fluid in evaporator just can enter under Action of Gravity Field in No. 1 heater 19 and No. 2 heaters 13.Heater outlet 10 use pipelines 8 connect steam chest import 12, and cleaning fluid then heats the steam chest of heater.The steam chest outlet 20 use pipelines 8 of No. 1 heater 19 connect the heater import 9 of No. 2 heaters 13, can adopt this connected mode that many heater series connection are cleaned.The steam chest of top heater outlet 20 use pipelines 8 connect the entrance of water pumps 14, steam chest outlet 20 other Venturi tube 16 that connect to the pipeline 8 between the entrance of water pump 14, and when water pump 14 work, can be with in the salt acid scavenger suction cleaning fluid system in sampling basin 17.All dispose valve 11 on each section connecting pipe 8, can change the cleaning fluid flow by control valve, make the flow velocity of liquid greater than the speed of the rear aerogenesis of reaction, avoided the mobile middle air-resistance phenomenon that produces of liquid-circulating.

Claims

1. the inside and outside fouling chemical cycle cleaning method of sugar refinery evaporator and heater tube, it is characterized in that: the water of packing in evaporator, dress shower nozzle above the tympanites of evaporator, shower nozzle is communicated with the outlet of cast iron clarified water pump, syrup outlet at the bottom of evaporator is communicated with the upper interface of tympanites, the tympanites lower interface is communicated with the heater import, and the heater import is lower than liquid level in evaporator, heater outlet is communicated with the steam chest import, steam chest exports with pipeline communication cast iron clarified water pump entrance and the other Venturi tube that passes in succession the sampling basin of this segment pipe, the sampling hydrochloric acid of packing in basin, starting cast iron clarified water pump, make the hydrochloric acid weight concentration of cleaning fluid be controlled at 0.2～0.5%, and control reaction aerogenesis speed less than the pipeline liquid flow velocity, allow gas overflow from the evaporator manhole.

2. by sugar refinery claimed in claim 1 evaporator and the inside and outside fouling chemical cycle cleaning method of heater tube, it is characterized in that: all dispose valve on each section connecting pipe, control reaction aerogenesis speed less than the pipeline liquid flow velocity by control valve, whole scavenging period is 3～4 hours.

3. by sugar refinery claimed in claim 2 evaporator and the inside and outside fouling chemical cycle cleaning method of heater tube, it is characterized in that: the corrosion inhibiter that also is incorporated with macromolecule phenyl ring, heterocycle compositions of mixtures in the sampling basin.