CN106694479B - Cleaning method and device for mixed liquid ammonia evaporator - Google Patents
Cleaning method and device for mixed liquid ammonia evaporator Download PDFInfo
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- CN106694479B CN106694479B CN201710014547.0A CN201710014547A CN106694479B CN 106694479 B CN106694479 B CN 106694479B CN 201710014547 A CN201710014547 A CN 201710014547A CN 106694479 B CN106694479 B CN 106694479B
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- liquid ammonia
- ammonia evaporator
- coil pipe
- water
- evaporator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
- B08B9/0328—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid by purging the pipe with a gas or a mixture of gas and liquid
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The embodiment of the invention discloses a cleaning method and a cleaning device for a mixed liquid ammonia evaporator, wherein the embodiment of the invention comprises the following steps: injecting nitrogen into the liquid ammonia evaporator to replace ammonia in the liquid ammonia evaporator; injecting water into a coil pipe in the liquid ammonia evaporator; when the coil pipe is filled with water, injecting nitrogen into the coil pipe to enable the air pressure value in the coil pipe to be increased to a preset value; and opening a valve of the liquid ammonia evaporator to discharge the water-gas mixture in the coil pipe. The embodiment of the invention provides a cleaning process for dredging a dirt block by adopting water-air alternative combined cleaning for a liquid ammonia evaporator.
Description
Technical Field
The invention relates to the technical field of industrial discharge, in particular to a cleaning method and a cleaning device for a mixed liquid ammonia evaporator.
Background
In the prior art, the problem of impurity pollution blockage of the hybrid liquid ammonia evaporator is mostly solved by adopting a periodic pollution discharge mode, namely, an ammonia side pollution discharge valve of the liquid ammonia evaporator is opened to discharge pollution, the method can only discharge a small amount of dirt in a flowing state, the effect is poor, and the impurities are more and more serious along with the extension of the running time of the liquid ammonia evaporator. Therefore, the pollution blockage cleaning process of the mixed liquid ammonia evaporator needs to be improved urgently.
Disclosure of Invention
The embodiment of the application provides a cleaning method and a cleaning device for a mixed liquid ammonia evaporator, and provides a cleaning process for performing pollution blockage dredging on the mixed liquid ammonia evaporator by adopting water-gas alternative combined cleaning.
In view of the above, the first aspect of the present invention provides a cleaning method for a hybrid liquid ammonia evaporator, comprising:
injecting nitrogen into the liquid ammonia evaporator, and replacing ammonia in the liquid ammonia evaporator;
injecting water into a coil pipe in the liquid ammonia evaporator;
when the coil pipe is filled with water, injecting nitrogen into the coil pipe so as to enable the air pressure value in the coil pipe to be increased to a preset value;
and opening a sewage valve of the liquid ammonia evaporator to discharge the water-gas mixture in the coil pipe.
With reference to the first aspect of the embodiments of the present invention, in a first implementation manner of the first aspect of the embodiments of the present invention, before injecting nitrogen gas into the liquid ammonia evaporator, the replacing ammonia gas in the liquid ammonia evaporator further includes:
heating the liquid ammonia evaporator.
With reference to the first aspect of the embodiments of the present invention, in any one of the first implementation manner of the first aspect, in a second implementation manner of the first aspect of the embodiments of the present invention, after injecting water into the coil of the liquid ammonia evaporator, injecting nitrogen into the coil so that before the air pressure value of the liquid ammonia evaporator rises to the preset value, the method further includes:
dissolving and discharging soluble salt impurities.
In combination with the first aspect of the example embodiment, any one of the first to second implementation manners of the first aspect, in a third implementation manner of the first aspect of the example embodiment of the invention, after the blowdown valve of the liquid ammonia evaporator is opened so that the water-gas mixture in the coil is discharged, the method further includes:
filling nitrogen into a coil pipe so that residual non-soluble impurities and moisture in the coil pipe are carried out by the nitrogen;
heating coil, residual moisture in the drying coil.
With reference to the first aspect of the present example, any one of the first to third implementation manners of the first aspect, in a fourth implementation manner of the first aspect of the present example, after heating the coil and drying the residual moisture in the coil, the method further includes:
injecting nitrogen into the liquid ammonia evaporator, maintaining pressure and sealing.
A second aspect of the invention provides an apparatus comprising:
the replacement module is used for injecting nitrogen into the liquid ammonia evaporator and replacing ammonia in the liquid ammonia evaporator;
the water injection module is used for injecting water to the coil pipe in the liquid ammonia evaporator;
the first air charging module is used for charging nitrogen into the coil pipe when the coil pipe is filled with water so as to increase the air pressure value in the coil pipe to a preset value;
and the opening module is used for opening a sewage valve of the liquid ammonia evaporator so as to discharge the water-gas mixture carrying impurities in the coil pipe.
In combination with the second aspect of the embodiment of the present invention, in the first implementation manner of the second aspect of the embodiment of the present invention, the method further includes:
and the heating module is used for heating the liquid ammonia evaporator.
With reference to the second aspect of the present embodiments, any one of the first implementation manners of the second aspect, in the second implementation manner of the second aspect of the present embodiments, the method further includes:
and the dissolving module is used for dissolving and discharging soluble salt impurities.
With reference to the second aspect of the present example, any one of the first implementation manner to the second implementation manner of the second aspect, in a third implementation manner of the second aspect of the present example, the method further includes:
and the second aeration module is used for aerating nitrogen into the coil pipe so that the residual non-soluble impurities and moisture in the coil pipe are carried out by the nitrogen.
And the drying module is used for heating the coil and drying residual moisture in the coil.
With reference to the second aspect of the present example, any one of the first implementation manner to the third implementation manner of the second aspect, in a fourth implementation manner of the second aspect of the present example, the method further includes:
and the third inflation module is used for injecting nitrogen into the liquid ammonia evaporator and maintaining pressure and sealing.
According to the technical scheme, the embodiment of the invention has the following advantages:
the embodiment of the invention provides a cleaning method and a cleaning device for a mixed liquid ammonia evaporator, which are used for dredging the dirt blockage of the liquid ammonia evaporator by adopting a cleaning process of water-gas alternative combined cleaning and discharging impurities of the liquid ammonia evaporator. The method can reasonably utilize the existing components and systems of the hybrid liquid ammonia evaporator, and has the advantages of safety, high efficiency and low cost.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of one embodiment of a method for cleaning a hybrid liquid ammonia evaporator according to one embodiment of the present invention;
fig. 2 is a schematic diagram of an embodiment of an apparatus in an embodiment of the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention provides a cleaning method of a mixed liquid ammonia evaporator. Referring to fig. 1, fig. 1 is a schematic view of a work flow of an embodiment of the present invention.
and injecting nitrogen into the liquid ammonia evaporator to replace residual ammonia in the liquid ammonia evaporator. The operation of the liquid ammonia evaporator is required to be stopped before replacement, a valve of the liquid ammonia evaporator for liquid ammonia inlet and an outlet gas ammonia valve of the liquid ammonia evaporator for gas ammonia discharge are cut off, and a heating steam system in the liquid ammonia evaporator is required to be kept to continue operating during replacement, so that the liquid ammonia evaporator is in a hot standby state.
102, injecting water into a coil pipe in the liquid ammonia evaporator, dissolving and discharging soluble salt impurities;
the coil pipe of the liquid ammonia evaporator is filled with water through a pressure gauge interface on the liquid ammonia evaporator, and the water is mainly filled into the coil pipe at the ammonia side of the liquid ammonia evaporator. After the liquid ammonia evaporator is filled with water, part of soluble salt impurities are dissolved out, and then the salt impurities are discharged through an outlet sewage discharge pipeline of the liquid ammonia evaporator. If the dirt in the liquid ammonia evaporator is seriously blocked, the salt impurities can not be discharged smoothly, and the liquid ammonia evaporator can be discharged after standing for 5 to 10 minutes.
103, injecting nitrogen into the coil pipe after filling water again to enable the air pressure value in the coil pipe to rise to a preset value;
and under the condition that the coil pipe of the liquid ammonia evaporator is kept full of water, closing a water inlet valve of the pressure gauge, and filling nitrogen into the ammonia side coil pipe of the liquid ammonia evaporator through a nitrogen pipeline interface. The pressure of the nitrogen gas may be about 1.0 to 1.5 Mpa. The specific requirement is determined according to the degree of pollution blockage, but the highest air pressure value cannot be more than 1.25 times of the operating pressure of the liquid ammonia. And boosting the pressure of the liquid ammonia evaporator to be balanced with the pressure of a nitrogen gas source.
after the liquid ammonia evaporator is pressurized to be balanced with the pressure of a nitrogen gas source, the blow-off valve is opened instantly and quickly, and a large amount of dirt and blockage impurities in the liquid ammonia evaporator can be carried out along with the water-gas mixture due to instant pressure release. This step may be repeated several times. Whether the process of flushing the water-gas mixture needs to be continued or not can be judged according to the amount of flushed impurities and the clear condition of the outlet water. The process of flushing the water-gas mixture for 2-3 times is generally adopted, and the dirt and the blocking impurities in the system can be flushed out completely.
because the coil pipe of the liquid ammonia evaporator is strictly forbidden to contain water, when impurities in the coil pipe are completely dredged, namely the effluent water quality is clear, nitrogen gas needs to be continuously and intermittently filled to discharge the residual non-soluble impurities and water in the coil pipe.
at the temperature of 60-70 ℃, a gas ammonia side blow-down valve of the liquid ammonia evaporator is opened, residual moisture in the coil is dried, and the drying time can be set to be about 0.5 hour in practical application.
and injecting nitrogen into the liquid ammonia evaporator, maintaining the pressure and sealing. In practical application, 0.4-0.6Mpa nitrogen can be charged for 3 times, the liquid ammonia coil in the liquid ammonia evaporator is replaced by nitrogen from air, the pressure is maintained for 1 hour, and when the air tightness is qualified, the liquid ammonia evaporator is converted into a pressure-maintaining standby state.
In the above description, a method for cleaning a hybrid liquid ammonia evaporator according to an embodiment of the present invention is described, and an apparatus according to an embodiment of the present invention is described below.
Referring to fig. 2, fig. 2 is a device according to an embodiment of the invention.
The device comprises a replacement module 201, a water injection module 202, a first inflation module 203, an opening module 204, a heating module 205, a dissolving module 206, a second inflation module 207, a drying module 208 and a third inflation module 209.
And the replacement module 201 is used for injecting nitrogen into the liquid ammonia evaporator and replacing ammonia in the liquid ammonia evaporator.
And the water injection module 202 is used for injecting water to the coil pipe in the liquid ammonia evaporator.
And the first inflation module 203 is used for injecting nitrogen into the coil pipe when the coil pipe is filled with water, so that the air pressure value in the coil pipe is increased to a preset value.
And the opening module 204 is used for opening a sewage valve of the liquid ammonia evaporator so as to discharge the water-gas mixture carrying impurities in the coil pipe.
A heating module 205 for heating the liquid ammonia evaporator.
And a dissolving module 206 for dissolving and discharging soluble salt impurities.
And a second aeration module 207 for aerating nitrogen into the coil and entraining out the remaining non-soluble impurities and moisture in the coil with an air flow.
And a drying module 208 for heating the coil and drying the residual moisture in the coil.
And a third inflation module 209 for injecting nitrogen into the liquid ammonia evaporator and maintaining pressure and sealing.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A cleaning method of a hybrid liquid ammonia evaporator is characterized by comprising the following steps:
injecting nitrogen into the liquid ammonia evaporator to replace ammonia in the liquid ammonia evaporator;
injecting water into a coil pipe in the liquid ammonia evaporator;
filling water into the coil pipe through a pressure gauge interface on the liquid ammonia evaporator, closing a water inlet valve of the pressure gauge under the condition that the coil pipe is kept full of water when the coil pipe is filled with water, and injecting nitrogen into the coil pipe through a nitrogen pipeline interface so as to enable the air pressure value in the coil pipe to be increased to a preset value;
and opening a sewage valve of the liquid ammonia evaporator to discharge the water-gas mixture in the coil pipe.
2. The method for cleaning a hybrid liquid ammonia evaporator according to claim 1, wherein the step of injecting nitrogen into the liquid ammonia evaporator to replace ammonia in the liquid ammonia evaporator further comprises:
heating the liquid ammonia evaporator.
3. The cleaning method for the hybrid liquid ammonia evaporator as recited in claim 2, wherein the step of injecting nitrogen gas into the coil pipe after injecting water into the coil pipe of the liquid ammonia evaporator so that the air pressure value of the liquid ammonia evaporator is increased to a preset value further comprises the following steps:
dissolving and discharging soluble salt impurities.
4. The method of cleaning a hybrid liquid ammonia evaporator of claim 3, further comprising, after opening a blowdown valve of the liquid ammonia evaporator to allow the water-gas mixture in the coil to drain:
charging nitrogen gas into the coil pipe so that the residual non-soluble impurities and moisture in the coil pipe are carried out by the nitrogen gas;
and heating the coil pipe, and drying residual moisture in the coil pipe.
5. The method of cleaning a hybrid liquid ammonia evaporator as set forth in claim 4, further comprising, after heating said coil to dry residual moisture within said coil:
and injecting nitrogen into the liquid ammonia evaporator, maintaining pressure and sealing.
6. A cleaning apparatus for a hybrid liquid ammonia evaporator, comprising:
the replacement module is used for injecting nitrogen into the liquid ammonia evaporator to replace ammonia in the liquid ammonia evaporator;
the water injection module is used for injecting water to the coil pipe in the liquid ammonia evaporator;
the first inflation module is used for filling water into the coil pipe through a pressure gauge interface on the liquid ammonia evaporator, closing a water inlet valve of the pressure gauge under the condition that the coil pipe is kept full of water when the coil pipe is filled with water, and injecting nitrogen into the coil pipe through a nitrogen pipeline interface so as to enable the air pressure value in the coil pipe to be increased to a preset value;
and the opening module is used for opening a sewage valve of the liquid ammonia evaporator so as to discharge the water-gas mixture in the coil pipe.
7. The apparatus of claim 6, further comprising:
and the heating module is used for heating the liquid ammonia evaporator.
8. The apparatus of claim 7, further comprising:
and the dissolving module is used for dissolving and discharging soluble salt impurities.
9. The apparatus of claim 8, further comprising:
the second inflation module is used for inflating nitrogen into the coil pipe so that the residual non-soluble impurities and moisture in the coil pipe are brought out by the nitrogen;
and the drying module is used for heating the coil pipe and drying residual moisture in the coil pipe.
10. The apparatus of claim 9, further comprising:
and the third inflation module is used for injecting nitrogen into the liquid ammonia evaporator and maintaining pressure and sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710014547.0A CN106694479B (en) | 2017-01-09 | 2017-01-09 | Cleaning method and device for mixed liquid ammonia evaporator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710014547.0A CN106694479B (en) | 2017-01-09 | 2017-01-09 | Cleaning method and device for mixed liquid ammonia evaporator |
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| CN106694479A CN106694479A (en) | 2017-05-24 |
| CN106694479B true CN106694479B (en) | 2020-05-26 |
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| CN201710014547.0A Active CN106694479B (en) | 2017-01-09 | 2017-01-09 | Cleaning method and device for mixed liquid ammonia evaporator |
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| CN109458872A (en) * | 2018-12-15 | 2019-03-12 | 华能应城热电有限责任公司 | A kind of liquid ammonia evaporator coil pipe cleaning device and cleaning method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103623699A (en) * | 2013-12-13 | 2014-03-12 | 贵州电力试验研究院 | Method for nitrogen displacement in denitration and deamination zones |
| CN205109063U (en) * | 2015-11-16 | 2016-03-30 | 菏泽锅炉厂有限公司 | Water bath coiled liquid ammonia evaporator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8580151B2 (en) * | 2009-12-18 | 2013-11-12 | Lummus Technology Inc. | Flux addition as a filter conditioner |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103623699A (en) * | 2013-12-13 | 2014-03-12 | 贵州电力试验研究院 | Method for nitrogen displacement in denitration and deamination zones |
| CN205109063U (en) * | 2015-11-16 | 2016-03-30 | 菏泽锅炉厂有限公司 | Water bath coiled liquid ammonia evaporator |
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| CN106694479A (en) | 2017-05-24 |
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