CN109331651A - A kind of shielding system and partition method of desulphurization denitration tower - Google Patents
A kind of shielding system and partition method of desulphurization denitration tower Download PDFInfo
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- CN109331651A CN109331651A CN201811444053.7A CN201811444053A CN109331651A CN 109331651 A CN109331651 A CN 109331651A CN 201811444053 A CN201811444053 A CN 201811444053A CN 109331651 A CN109331651 A CN 109331651A
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- desulphurization denitration
- denitration tower
- base catalyst
- carbon base
- inert gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8637—Simultaneously removing sulfur oxides and nitrogen oxides
Abstract
The present invention relates to a kind of shielding systems of desulphurization denitration tower, carbon base catalyst adsorption layer is equipped in the desulphurization denitration tower, desulphurization denitration tower side is equipped with smoke inlet, the other side is equipped with exhanst gas outlet, smoke inlet and exhanst gas outlet are connected to carbon base catalyst adsorption layer, the shielding system further includes ammonia pipeline and inert gas duct, ammonia pipeline one end is connected to smoke inlet, described inert gas duct one end is connected to desulphurization denitration tower bottom, it is connected between ammonia pipeline and inert gas duct by a connecting pipe, the connecting pipe is equipped with the first shut-off valve, inert gas duct is equipped with the second shut-off valve before connecting pipe, ammonia pipeline is equipped with third shut-off valve before connecting pipe, the system is in the case where the rising of carbon base catalyst temperature anomaly may cause kindling, room temperature is passed through into desulphurization denitration tower Inert gas, play the role of cooling, drop oxygen, inhibition bed temperature it is further up, avoid the generation of firing accident.
Description
Technical field
The present invention relates to the shielding systems and partition method of a kind of desulphurization denitration tower, and in particular to one kind is with carbon base catalyst
For the flue gas isolated operation and method in the boiler smoke combined desulfurization and denitration device of adsorbent and catalyst, belong to environmental project
Field.
Background technique
Charcoal base catalysis method flue gas desulfurization and denitrification technical principle are as follows: flue gas under the absorption and catalytic action of carbon base catalyst,
SO in flue gas2And O2And H20, which reacts, generates H2SO4, H2SO4It is adsorbed on carbon base catalyst surface；It is urged simultaneously using charcoal base
The catalytic performance of agent, NOx and dilution ammonia occur catalytic reduction reaction and generate N in flue gas2, the desulfurization for realizing flue gas is de-
Nitre, the carbon base catalyst after adsoption catalysis reaction recycle after being regenerated.Dilution ammonia is injected in desulfuring and denitrifying apparatus, is used
It is N by the NOx conversion in flue gas in the denitration reaction for realizing gas cleaning process2。
Carbon base catalyst used by charcoal base catalysis method flue gases purification be a kind of carbon content is higher, pore structure very
Solid particulate materials abundant.This catalyst has very strong adsorption capacity to pollutants such as SO2, SO3 in flue gas, may be used also
By its catalytic action, making NOx, reduction reaction generation N2 and H2O occurs for (100 ~ 200 DEG C) and NH3 at a lower temperature.But
Carbon base catalyst is also a kind of combustible, under certain condition, it is possible to Ignition Phenomena occurs in desulphurization denitration tower, thus
Jeopardize the safe operation of system and equipment.Therefore, it needs when process system and device design in the absorption for making full use of catalyst
It while catalytic performance, adopts an effective measure, avoids catalyst that kindling occurs or can be effectively controlled in the case of catching fire
The range and quantity, safeguards system and equipment safety of kindling material.
Under adsorption, desulfurization, denitration tower normal running conditions, due in design it is contemplated that thermal discharge and heat dissipation capacity it is flat
Weighing apparatus, changes within the scope of design parameter in so2 concentration in flue gas, temperature, oxygen amount, the flow condition of flue gas and carbon base catalyst compared with
In the case where good, the situation that temperature is quick or is substantially increased will not occur for the available effective control of bed temperature.But if in flue gas
SO2 concentration, temperature, oxygen amount are varied widely compared with design parameter, especially carbon base catalyst flow condition variation office
Portion is detained, and can lead to local or entirely bed temperature is substantially in desulphurization denitration tower or rapid increase leads to the consequence occurred of catching fire.
Some researches show that in environmental factor, influence of the oxygen content to kindling is fairly obvious.When oxygen concentration is 4% ~ 8%
When, oxidation reaction speed is very slow, and the relationship with temperature is linear relationship；When oxygen concentration is 12% ~ 18%, oxidation reaction speed
It may further speed up, the relationship of oxidation reaction speed and temperature is compound conic section relationship；When oxygen concentration is 21%
When, the speed of oxidation reaction is then possible to further speed up with the relationship of temperature in biquadratic relationship.It can be seen that when occurring
When kindling early warning, control oxygen content is one of the key means for preventing kindling.Desulphurization denitration tower is isolated from the outside, is no longer passed through
Flue gas, and inert gas replacement oxygen reduction oxygen content is introduced, temperature rising can be effectively controlled.
The heat of carbon base catalyst oxidation release such as cannot take away release, the temperature of carbon base catalyst itself by flue gas in time
It will increase, so that accelerated oxidation, discharges more heats.It can accelerate suddenly when temperature rises to about 200 DEG C, when even
Continue in the case where having oxygen, temperature can rise to 500 DEG C or more, more than the ignition point of carbon base catalyst, variation tendency such as attached drawing 2
It is shown.The kindling early warning temperature of carbon base catalyst is set as 170 DEG C, executes flue gas isolated operation at this time.
Summary of the invention
The present invention in order to solve the problems in the existing technology, provide a kind of desulphurization denitration tower flue gas shielding system and
Method is passed through the inert gas of room temperature, plays drop in the case where the rising of carbon base catalyst temperature anomaly may cause kindling
Temperature, drop oxygen effect, inhibit bed temperature further up, avoid the generation of firing accident.
In order to achieve the above object, technical solution proposed by the present invention are as follows: a kind of shielding system of desulphurization denitration tower, it is described
Carbon base catalyst adsorption layer is equipped in desulphurization denitration tower, desulphurization denitration tower side is equipped with smoke inlet, and the other side is equipped with cigarette
Gas outlet, smoke inlet and exhanst gas outlet be connected to carbon base catalyst adsorption layer, which further includes ammonia pipeline and lazy
Property gas pipeline, ammonia pipeline one end is connected to smoke inlet, described inert gas duct one end and desulphurization denitration tower bottom
Portion's connection, is connected between ammonia pipeline and inert gas duct by a connecting pipe, and the connecting pipe is equipped with first and closes
Disconnected valve, inert gas duct are equipped with the second shut-off valve before connecting pipe, and ammonia pipeline is equipped with third before connecting pipe
Shut-off valve.
Be further designed to above-mentioned technical proposal: the exhanst gas outlet is equipped with first gear plate valve.
The smoke inlet is equipped with second gear plate valve.
The desulphurization denitration tower bottom is additionally provided with dump skip, and carbon base catalyst adsorption layer bottom is equipped with discharger, charcoal
Base Catalyst Adsorption layer is discharged into dump skip by discharger outlet.
The carbon base catalyst adsorption layer is equipped with thermometer.
The thermometer is equipped with several, several thermometers are uniformly set along the short transverse of carbon base catalyst adsorption layer
It sets.
The inert gas is nitrogen.
A kind of partition method of the shielding system of above-mentioned desulphurization denitration tower, includes the following steps:
Step 1: close third shut-off valve, no longer to being passed through ammonia inside desulphurization denitration tower；
Step 2: closing second gear plate valve, no longer to being passed through flue gas inside desulphurization denitration tower；
Step 3: first gear plate valve, isolation desulphurization denitration tower and extraneous connection are closed；
Step 4: the second shut-off valve is opened, inert gas is introduced into desulphurization denitration tower, a part of inert gas will be along indifferent gas
Body pipeline enters desulphurization denitration tower bottom, is passed through carbon base catalyst adsorption layer by discharger outlet；
Step 5: the first shut-off valve is opened, inert gas duct is connected to ammonia pipeline, a part of inert gas passes through ammonia
Pipeline enters smoke inlet, is being passed through carbon base catalyst adsorption layer in the path of desulphurization denitration tower along flue gas.
Discharger can also be run in the above method with maximum frequency, the higher charcoal base of temperature in desulphurization denitration tower is urged
Agent is quickly discharged.
The invention has the benefit that
Shielding system of the invention monitors catalyst temperature by the thermometer being set in carbon base catalyst adsorption layer, works as temperature
Degree is abnormal when rising, and closes being passed through for flue gas and ammonia, and be passed through nitrogen into desulphurization denitration tower.The nitrogen at room being passed through is gradually
Flue gas is replaced, playing the role of cooling, drop oxygen until carbon base catalyst is in oxygen-free environment reduces carbon base catalyst fire risk.
Nitrogen divides two-way to be passed through desulphurization denitration tower in the present invention, and a routing ammonia pipeline enters desulphurization denitration through smoke inlet
Carbon base catalyst adsorption layer in tower；Another way enters bottom in desulphurization denitration tower by nitrogen pipeline, exports and enters through discharger
Carbon base catalyst adsorption layer, makes carbon base catalyst adsorption layer that nitrogen be completely covered, and fire risk is lower.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention.
Fig. 2 is the temperature variation of carbon base catalyst.
In attached drawing, 1- first gear plate valve；2- thermometer；3- discharger；4- second gear plate valve；The first shut-off valve of 5-；6-
Two shut-off valves；7- third shut-off valve, 8- carbon base catalyst adsorption layer, 9- ammonia pipeline, 10- nitrogen pipeline, 11- dump skip.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is described in detail.
Embodiment
As shown in Figure 1, a kind of shielding system of desulphurization denitration tower of the present embodiment, desulphurization denitration tower is cross-flow moving bed type
Formula, desulphurization denitration tower is interior to be equipped with carbon base catalyst adsorption layer 8, and desulphurization denitration tower bottom is additionally provided with dump skip 11, and the charcoal base is urged
Agent adsorption layer bottom is equipped with discharger 3, and carbon base catalyst adsorption layer is discharged into dump skip 11 by the outlet of discharger 3, and desulfurization is de-
Nitre tower side is equipped with smoke inlet, and second gear plate valve 4 is equipped at smoke inlet, and the other side is equipped with exhanst gas outlet, smoke outlet
Equipped with first gear plate valve 1, the first, second flapper valve is opened in logical flue gas, closing when needing to completely cut off flue gas；Smoke inlet and cigarette
Gas outlet is connected to carbon base catalyst adsorption layer 8, and flue gas enters from the second gear plate valve 4 of desulphurization denitration tower, is urged by charcoal base
After agent adsorption layer 8 purifies, it is discharged from first gear plate valve 1；Carbon base catalyst enters from the top of desulphurization denitration tower, unloads from lower part
Glassware 3 is discharged.
The present embodiment is equipped with ammonia pipeline 9 and inert gas duct, indifferent gas in the present embodiment outside desulphurization denitration tower
Body is nitrogen, cheap and easy to get, and described 9 one end of ammonia pipeline is connected to smoke inlet, described 10 one end of nitrogen pipeline and dump skip
11 connections, are connected between ammonia pipeline 9 and nitrogen pipeline 10 by a connecting pipe, and the connecting pipe is equipped with the first shutdown
Valve 5, nitrogen pipeline 10 are equipped with the second shut-off valve 6 before connecting pipe, and when normal operation closes, and beat when nitrogen being needed to introduce
It opens, ammonia pipeline 9 is equipped with third shut-off valve 7 before connecting pipe, and when normal operation opens, and is passed through ammonia into desulphurization denitration tower
Gas.
The carbon base catalyst adsorption layer of desulphurization denitration tower is provided with three layers of thermometer 2, and three layers of thermometer are along carbon base catalyst
Adsorption layer short transverse is uniformly arranged, and the temperature of the high, normal, basic different beds of real-time monitoring, alarm setting value selects 160 DEG C, when reaching
It is passed through flue gas to 170 DEG C of stoppings, and carries out isolated operation, prevents temperature from continuing to rise the kindling for leading to may to occur.
When there is kindling early warning, second gear plate valve 4 and first gear plate valve 1 are closed, nitrogen is passed through and starts gas displacement.This
When material system also working, have carbon base catalyst disengaging, the flue gas in desulphurization denitration tower can be by first gear plate valve 1 and unloading
Glassware 3 etc. leaks, and the nitrogen at room being passed through gradually replaces flue gas, plays the role of cooling, drop oxygen, until carbon base catalyst is in nothing
Oxygen environment.When selecting nitrogen time swap, the equipment of the nitrogen flow and other consumption nitrogen that need to comprehensively consider system is (such as
Regenerator) safety, nitrogen time swap is typically chosen 1.3-1.7h, preferably 1.5h.
The partition method of the shielding system of the present embodiment desulphurization denitration tower, includes the following steps:
Step 1: closing third shut-off valve 7, no longer to ammonia is passed through inside desulphurization denitration tower, ammonia pipeline 9 is used to be passed through nitrogen
Gas；
Step 2: closing second gear plate valve 4, no longer to being passed through flue gas inside desulphurization denitration tower；As system is provided with multiple desulfurization
Denitrating tower, the desulphurization denitration tower of temperature anomaly execute flue gas isolated operation, remaining desulphurization denitration tower operates normally；If system is single
A desulphurization denitration tower needs to stop according to operation sequence the operation of whole system；
Step 3: first gear plate valve 1, isolation desulphurization denitration tower and extraneous connection are closed；
Step 4: opening the second shut-off valve 6, introduce nitrogen into desulphurization denitration tower, a part of nitrogen will along nitrogen pipeline 10 into
Enter desulphurization denitration tower bottom, carbon base catalyst adsorption layer 8 is passed through by the outlet of discharger 3；
Step 5: opening the first shut-off valve 5, nitrogen pipeline 10 be connected to ammonia pipeline 9, and a part of nitrogen passes through ammonia pipeline
9 enter smoke inlet, then are passed through carbon base catalyst adsorption layer 8 in the path of desulphurization denitration tower along flue gas.
Discharger 3 can also be run with maximum frequency in the above method, by the higher charcoal base of temperature in desulphurization denitration tower
Catalyst is quickly discharged.Discharger 3 is that motor driven frequency conversion is adjustable in the present embodiment, it is possible to provide different carbon base catalyst outlets
Ability.Discharger 3 needs to consider the purification efficiency of desulphurization denitration tower in selection normal operating frequency；The maximum operation of discharger 3
Frequency needs to consider quickly to be discharged the ability of carbon base catalyst under extreme case.3 normal operating frequency of discharger is typically chosen most
/ 5th of big running frequency.
When there is catching fire early warning, material system is also working desulphurization denitration tower, there is a carbon base catalyst disengaging, and via
The nitrogen that ammonia pipeline 9 enters carbon base catalyst adsorption layer 8 is not easy to reach 8 bottom of carbon base catalyst adsorption layer and dump skip 11,
If the higher carbon base catalyst of portion temperature still remains fire risk, this implementation after discharger 3 enters dump skip 11 at this time
Example is passed through nitrogen into dump skip 11 simultaneously, and nitrogen enters carbon base catalyst adsorption layer 8 through the outlet of discharger 3, guarantees that charcoal base is urged
Agent adsorption layer 8 and the carbon base catalyst for entering dump skip 11 are covered by nitrogen completely, to reduce fire risk.
Technical solution of the present invention is not limited to the various embodiments described above, all technical solutions obtained using equivalent replacement mode
It all falls in the scope of protection of present invention.
Claims (9)
1. a kind of shielding system of desulphurization denitration tower, the desulphurization denitration tower is interior to be equipped with carbon base catalyst adsorption layer, the desulfurization
Denitrating tower side is equipped with smoke inlet, and the other side is equipped with exhanst gas outlet, smoke inlet and exhanst gas outlet and carbon base catalyst adsorbs
Layer connection, it is characterised in that: further include ammonia pipeline and inert gas duct, ammonia pipeline one end and smoke inlet connect
Logical, described inert gas duct one end is connected to desulphurization denitration tower bottom, passes through one between ammonia pipeline and inert gas duct
Connecting pipe connection, the connecting pipe are equipped with the first shut-off valve, and inert gas duct is equipped with second before connecting pipe
Shut-off valve, ammonia pipeline are equipped with third shut-off valve before connecting pipe.
2. the shielding system of desulphurization denitration tower according to claim 1, it is characterised in that: the exhanst gas outlet is equipped with first gear
Plate valve.
3. the shielding system of desulphurization denitration tower according to claim 2, it is characterised in that: the smoke inlet is equipped with second gear
Plate valve.
4. the shielding system of desulphurization denitration tower according to claim 3, it is characterised in that: the desulphurization denitration tower bottom is also set
There is dump skip, carbon base catalyst adsorption layer bottom is equipped with discharger, and carbon base catalyst adsorption layer is exported by discharger and arranged
Enter dump skip.
5. the shielding system of desulphurization denitration tower according to claim 1, it is characterised in that: on the carbon base catalyst adsorption layer
Equipped with thermometer.
6. the shielding system of desulphurization denitration tower according to claim 5, it is characterised in that: the thermometer is equipped with several,
Several thermometers are uniformly arranged along the short transverse of carbon base catalyst adsorption layer.
7. the shielding system of desulphurization denitration tower according to claim 1, it is characterised in that: the inert gas is nitrogen.
8. the partition method of the shielding system of desulphurization denitration tower described in a kind of claim 4, which is characterized in that including walking as follows
It is rapid:
Step 1: close third shut-off valve, no longer to being passed through ammonia inside desulphurization denitration tower；
Step 2: closing second gear plate valve, no longer to being passed through flue gas inside desulphurization denitration tower；
Step 3: first gear plate valve, isolation desulphurization denitration tower and extraneous connection are closed；
Step 4: the second shut-off valve is opened, inert gas is introduced into desulphurization denitration tower, a part of inert gas will be along indifferent gas
Body pipeline enters desulphurization denitration tower bottom, is passed through carbon base catalyst adsorption layer by discharger outlet；
Step 5: the first shut-off valve is opened, inert gas duct is connected to ammonia pipeline, a part of inert gas passes through ammonia
Pipeline enters smoke inlet, is being passed through carbon base catalyst adsorption layer in the path of desulphurization denitration tower along flue gas.
9. the partition method of desulphurization denitration tower according to claim 7, it is characterised in that: transport discharger with maximum frequency
Row, the higher carbon base catalyst of temperature in desulphurization denitration tower is quickly discharged.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811444053.7A CN109331651A (en) | 2018-11-29 | 2018-11-29 | A kind of shielding system and partition method of desulphurization denitration tower |
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| CN201811444053.7A CN109331651A (en) | 2018-11-29 | 2018-11-29 | A kind of shielding system and partition method of desulphurization denitration tower |
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| JP2000005554A (en) * | 1998-06-19 | 2000-01-11 | Furukawa Co Ltd | Safety device of activated carbon-packed tower |
| CN203291682U (en) * | 2013-05-29 | 2013-11-20 | 山西太钢不锈钢股份有限公司 | Double-protection safety device for sintering flue gas desulfurization and denitrification through activated carbon |
| CN105233673A (en) * | 2015-11-12 | 2016-01-13 | 国电科学技术研究院 | Carbon-based catalyst desulfurization and denitrification system and method |
| CN107998818A (en) * | 2017-05-08 | 2018-05-08 | 中冶长天国际工程有限责任公司 | The inert gas protection system and method for activated carbon adsorber |
| CN108479296A (en) * | 2018-03-22 | 2018-09-04 | 中国科学院过程工程研究所 | A kind of adsorption tower overtemperature duplicate protection system |
| CN209271193U (en) * | 2018-11-29 | 2019-08-20 | 国电环境保护研究院有限公司 | A kind of shielding system of desulphurization denitration tower |
-
2018
- 2018-11-29 CN CN201811444053.7A patent/CN109331651A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000005554A (en) * | 1998-06-19 | 2000-01-11 | Furukawa Co Ltd | Safety device of activated carbon-packed tower |
| CN203291682U (en) * | 2013-05-29 | 2013-11-20 | 山西太钢不锈钢股份有限公司 | Double-protection safety device for sintering flue gas desulfurization and denitrification through activated carbon |
| CN105233673A (en) * | 2015-11-12 | 2016-01-13 | 国电科学技术研究院 | Carbon-based catalyst desulfurization and denitrification system and method |
| CN107998818A (en) * | 2017-05-08 | 2018-05-08 | 中冶长天国际工程有限责任公司 | The inert gas protection system and method for activated carbon adsorber |
| CN108479296A (en) * | 2018-03-22 | 2018-09-04 | 中国科学院过程工程研究所 | A kind of adsorption tower overtemperature duplicate protection system |
| CN209271193U (en) * | 2018-11-29 | 2019-08-20 | 国电环境保护研究院有限公司 | A kind of shielding system of desulphurization denitration tower |
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