CN102878781A

CN102878781A - Boiler steam heating dry preservation method

Info

Publication number: CN102878781A
Application number: CN2012104199871A
Authority: CN
Inventors: 陈国文; 赵永乐
Original assignee: Qingdao Huaren Pharmaceutical Co Ltd
Current assignee: Qingdao Huaren Pharmaceutical Co Ltd
Priority date: 2012-10-29
Filing date: 2012-10-29
Publication date: 2013-01-16
Anticipated expiration: 2032-10-29
Also published as: CN102878781B

Abstract

The invention provides a boiler steam heating dry preservation method. The boiler steam heating dry preservation method is characterized by comprising the following steps: (1) utilizing steam to heat, warm up and boost a boiler, and utilizing the steam to discharge furnace air from an air valve; (2) unceasingly heating, warming up and boosting the steam, when steam pressure is lifted so as to open a blow-off valve to eliminate the condensed water in a furnace; (3) when the steam pressure is lifted again, an inlet steam valve is closed, and maintaining pressure for a long time; (4) reopening the blow-off valve, discharging full steam in the furnace, closing each valve, reducing furnace pressure to zero at this point, and setting the temperature to be between 70-90 DEG C; and (5) utilizing heat in the furnace to dry the furnace body, fully drying the furnace, and achieving a preventive maintenance purpose. The boiler steam heating dry preservation method provided by the invention has the advantages that the labour is saved, a drying agent is not consumed, the cost is low, the operation is simple, and the maintenance quality is high.

Description

Boiler Steam heating dry preservation method

Technical field

The invention belongs to the boiler applications technical field, relate to the maintenance method after a kind of boiler is stopped using, is a kind of Boiler Steam heating dry preservation method specifically.

Background technology

In order to slow down the extent of corrosion of boiler, need to maintain boiler, the maintenance of boiler is divided into two kinds of wet preservation and dry preservations usually, and wet preservation is for the boiler in using, and dry preservation is for the boiler after stopping using.

The wet preservation main purpose of boiler is to reduce the oxygen content of feedwater, and common hard water is processed into soft water, and method for treating water is more, mainly contains following several: the outer tenderizer of (1) stove; (2) physics tenderizer; (3) tenderizer in the stove; (4) deoxygenation; (5) boiler blow-off etc.At present, what the outer water correction of stove was adopted is base exchange method, and the methods such as ion, hydrogen ion are received in cation exchange water treatment commonly used.

At present, the dry preservation after boiler is stopped using adopts following methods to carry out step by step usually:

(1) at first with boiler internal incrustation scale and iron rust with outside cigarette is smelly cleans out, with low baking temperature boiler is dried.

(2) will fill the uncovered box of drier, be positioned in the upper and lower drum and header of the boiler of stopping using, and boiler circuit and air and flue system will tightly be completely cut off with extraneous.Sealing manhole, hand hole.

(3) drier normal operation anhydrous calcium chloride or quick lime.Its expense can be calculated according to the volume of boiler.As use block anhydrous calcium chloride. then add 1-2 kg in the average cube volume, as use quick lime, then add 2-3 kg.

(4) effect in order to guarantee that dry type is maintained is after dry preservation begins. and first month is opened manhole, hand hole once checks, as finding powdering of drier, loses wettability power, the drier that then will more renew.According to the inspection situation, can shorten or prolong the later replacing time.

(5) stop using more than two or three months or the boiler of longer time, behind inside and outside dirt removal, be coated with antirust paint in heating surface inside.Annex also will overhaul verification, except oil guard, in burner hearth and flue, places quick lime, carries out dry preservation.

This dry type maintenance method is cumbersome, not only needs artificial treatment, makes regular check on, and also consume drier, and maintenance qualities plays fully certainly in human factor.

Summary of the invention

The present invention is the problems referred to above that the solution prior art exists, and a kind of Boiler Steam heating dry preservation method is provided, and utilizes vacuum antiseptic erosion principle that boiler is carried out dry preservation, saves manually, does not consume drier, guarantees maintenance qualities.

The objective of the invention is to be achieved through the following technical solutions:

A kind of Boiler Steam heating dry preservation method is characterized in that, comprises the steps: that (1) boiler progressively heats, heats up, boosts with steam, utilizes steam that furnace air is discharged from air valve; (2) continue Steam Heating, heat up, boost, after steam pressure raises, open blowoff valve and get rid of condensed water in the stove; (3) after steam pressure raises again, close into steam valve pressurize a period of time; (4) open sewage draining valve again, with the whole emptyings of the steam in the stove, close each valve, this moment, furnace pressure dropped to zero, and temperature is between 70-90 ℃; (5) utilize the heat in the stove to dry body of heater, make abundant drying in the stove, reach the purpose of maintaining.

Further improvement to said method: the discharge of condensed water is carried out at twice in the step (2), when being increased to 0.1Mpa, opens steam pressure the condensed water in the blowoff valve eliminating stove, close again blowoff valve, after steam pressure is increased to 0.25Mpa again, again drives blowoff valve and get rid of and to close blowoff valve behind the residual condensed water in the stove.

Further improvement to said method is: after condensed water is got rid of in the step (3), close when steam pressure rises to 0.3Mpa into steam valve, pressurize was opened sewage draining valve after 4 hours, with the whole emptyings of the steam in the stove, closed each valve again.

Further improvement to said method is: above method step (1) to (5) carries out once at least per month.

The present invention compared with prior art has following advantage and good effect:

The present invention adopts vacuum antiseptic erosion principle that boiler is carried out dry preservation, utilizes the heat oven dry body of heater in the stove, makes stove interior fully dry, reaches the purpose of maintaining.Save manually, do not consume drier, cost of upkeep is low, and is easy and simple to handle, and maintenance qualities is high.

The specific embodiment

The embodiment of a kind of Boiler Steam heating of the present invention dry preservation method comprises the steps:

(1) boiler progressively heats, heats up, boosts with steam, utilizes steam that furnace air is discharged from air valve;

(2) continue Steam Heating, heat up, boost, after steam pressure raises, open blowoff valve and get rid of condensed water in the stove;

(3) after steam pressure raises again, close into steam valve pressurize a period of time;

(4) open sewage draining valve again, with the whole emptyings of the steam in the stove, close each valve, this moment, furnace pressure dropped to zero, and temperature is between 70-90 ℃;

(5) utilize the heat in the stove to dry body of heater, make abundant drying in the stove, reach the purpose of maintaining.Above method step (1) to (5) carries out once at least per month.

Concrete operation step is as follows:

1. first air valve is opened emptyingly, closed each blowoff valve draining and water supply valve door;

2. open main steam valve and pipeline and in stove, put into steam;

3. along with the entering of steam, pressure increases, and the air in the stove can be discharged from air valve, sees and closes air door when steam;

4. beginning progressively heats up in the stove, boosts, and opens the condensed water in the blowoff valve eliminating stove when steam pressure rises to 0.1Mpa, closes blowoff valve again;

5. when steam pressure rises to 0.25Mpa, again open blowoff valve with the residual water emptying, close blowoff valve;

6. when steam pressure rises to 0.3Mpa, close into steam valve;

7. pressure kept 4 hours, opened sewage draining valve, with the whole emptyings of the steam in the stove;

8, this moment, furnace pressure dropped to zero, and temperature is utilized the heat oven dry body of heater in the stove between 70-90 ℃, make in the stove fully dry.

9, for making boiler dry type maintaining better effects if, above method is carried out once at least per month.

Certainly, above-mentioned explanation is not to be limitation of the present invention, and the present invention also is not limited to above-mentioned giving an example; those skilled in the art; in essential scope of the present invention, the variation of having done, remodeling, interpolation or replacement also should belong to protection scope of the present invention.

Claims

1. a Boiler Steam heating dry preservation method is characterized in that, comprises the steps: that (1) boiler progressively heats, heats up, boosts with steam, utilizes steam that furnace air is discharged from air valve; (2) continue Steam Heating, heat up, boost, after steam pressure raises, open blowoff valve and get rid of condensed water in the stove; (3) after steam pressure raises again, close into steam valve pressurize a period of time; (4) open sewage draining valve again, with the whole emptyings of the steam in the stove, close each valve, this moment, furnace pressure dropped to zero, and temperature is between 70-90 ℃; (5) utilize the heat in the stove to dry body of heater, make abundant drying in the stove, reach the purpose of maintaining.

2. according to Boiler Steam heating dry preservation method claimed in claim 2, it is characterized in that, the discharge of condensed water is carried out at twice in the described step (2), when being increased to 0.1Mpa, opens steam pressure the condensed water in the blowoff valve eliminating stove, close again blowoff valve, after steam pressure is increased to 0.25Mpa again, again drives blowoff valve and get rid of and to close blowoff valve behind the residual condensed water in the stove.

3. according to claim 1 or 2 described Boiler Steam heating dry preservation methods, it is characterized in that, after condensed water is got rid of in the described step (3), when rising to 0.3Mpa, steam pressure closes into steam valve, pressurize was opened sewage draining valve after 4 hours, with the whole emptyings of the steam in the stove, close again each valve.

4. according to claim 1 or 2 described Boiler Steam heating dry preservation methods, it is characterized in that described step (1) to (5) is carried out once at least per month.

5. according to Boiler Steam heating dry preservation method claimed in claim 3, it is characterized in that described step (1) to (5) is carried out once at least per month.