CN212236741U - Low-temperature denitration catalyst regeneration device - Google Patents

Abstract

The low-temperature denitration catalyst regeneration device comprises a low-temperature denitration reactor, a cooling pipeline and a combustion furnace, wherein the low-temperature denitration catalyst is contained in the low-temperature denitration reactor, the combustion furnace outputs high-temperature flue gas to the cooling pipeline, the high-temperature flue gas is cooled to 320 ℃ after being cooled by the cooling pipeline and before being sent into the low-temperature denitration reactor, and the gas in the low-temperature denitration reactor is discharged from an output port of the low-temperature denitration reactor. The utility model discloses a low temperature denitration catalyst regenerating unit utilizes cooling pipeline to cool down the control to the high temperature flue gas, sends into the high temperature flue gas of 320 ℃ that will obtain low temperature denitration reactor, makes the sulfate ammonium salt in the low temperature denitration reactor decompose for gas outgoing completely, solves the sulfur dioxide poisoning that causes the catalyst to be covered and reduce the problem of catalytic efficiency because of low temperature denitration catalyst.

Description

Low-temperature denitration catalyst regeneration device

Technical Field

The utility model relates to a low temperature denitration catalyst regeneration technical field, in particular to low temperature denitration catalyst regenerating unit.

Background

At present, the problem of air pollution in China is very serious, mainly because of the overproof emission of pollutant gases such as sulfur dioxide, nitrogen oxide, dust particles and the like. The nitrogen oxide can directly stimulate the lung of a human body to cause respiratory system diseases, and is also an important reason for forming photochemical smog and acid rain. Therefore, controlling and reducing nitrogen oxide emissions is an important measure for protecting the atmosphere. Therefore, China has developed strict nitrogen oxide emission standards, wherein Beijing requires a newly built boiler in the whole market to execute 30mg/m₃Has been close to the current most stringent boiler emission standard worldwide. The Selective Catalytic Reduction (SCR) has the characteristics of high efficiency, economy and practicability, becomes a key technology for removing nitrogen oxides, is internationally applied in a large amount of industrialization, and the preparation of a catalyst with high efficiency, high activity and long service life is the core of the technology.

Due to the production process and flow of the low-temperature denitration reactor, the flue gas temperature of the low-temperature denitration reactor is usually between 100 ℃ and 250 ℃, so that only the low-temperature SCR catalyst can be used.

A large number of catalysts showed good low temperature denitration performance, however, SO was found at low temperature₂The caused catalyst poisoning is a worldwide problem and is a key which troubles the application of low-temperature denitration catalysts at present. Even after passing through the desulfurization device, a small amount of SO remains in the flue gas₂，SO₂The ammonium sulfate salt reacts with ammonia gas serving as a reducing agent to generate ammonium sulfate salt, so that the holes of the catalyst are blocked, the active sites of the catalyst are covered, the activity of the catalyst is reduced, and the industrial application of the low-temperature denitration catalyst is hindered.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, an object of the utility model is to provide a low temperature denitration catalyst regenerating unit to solve the sulfur dioxide poisoning problem of low temperature denitration catalyst, facilitate for the industrial application of low temperature denitration catalyst.

According to the utility model discloses an aspect provides a low temperature denitration catalyst regenerating unit, a serial communication port, include:

the low-temperature denitration reactor comprises an input port and an output port, and a low-temperature denitration catalyst is arranged in the low-temperature denitration reactor;

the combustion furnace comprises a first input port for inputting fuel gas, a second input port for inputting combustion-supporting gas, an output port and an output port for outputting high-temperature flue gas;

and the temperature reduction pipeline comprises an input port and an output port, the input port of the temperature reduction pipeline is connected with the output port of the combustion furnace, and the output port of the temperature reduction pipeline is connected with the input port of the low-temperature denitration reactor.

Optionally, the cooling duct includes:

a first pipe including an input port and an output port, the output port of the first pipe being connected to the input port of the low-temperature denitration reactor;

a second pipe including an input port and an output port, the output port of the second pipe being connected with the input port of the first pipe;

a third pipe including an input port and an output port, the output port of the third pipe being connected with the input port of the first pipe.

Optionally, the burner further comprises:

and a third input port for inputting cold air.

Optionally, the low-temperature denitration catalyst regeneration device further comprises:

and the first fan comprises an input port and an output port, the input port of the first fan is connected with the third pipeline, and the input port of the first fan is connected with the third input port of the combustion furnace.

Optionally, the low-temperature denitration catalyst regeneration device further comprises:

and the fourth pipeline comprises an input port and an exhaust output port, and the input port of the fourth pipeline is connected with the output port of the low-temperature denitration reactor.

Optionally, the low-temperature denitration catalyst regeneration device further comprises:

the second fan comprises an input port and an output port, and the input port of the second fan is connected with the output port of the fourth pipeline;

and the chimney comprises an air inlet port and an air outlet port, and the air inlet port of the chimney is connected with the output port of the second fan.

Optionally, the low-temperature denitration reactor comprises:

and the soot blower is positioned in the low-temperature denitration reactor, and the soot blowing position of the soot blower is matched with the position of the low-temperature denitration catalyst.

Optionally, the low-temperature denitration catalyst regeneration device further comprises:

a plurality of temperature detectors disposed within the first, second, and third conduits;

a plurality of flow detectors disposed within the first, second, and third conduits;

at least one pressure detector disposed in the low-temperature denitration reactor;

a plurality of valves disposed on the passages of the first, second, and third conduits.

The utility model provides a low temperature denitration catalyst regenerating unit cools down the high temperature flue gas of burning furnace output through the cooling pipeline and handles, makes its temperature satisfy the utility model discloses the theoretical principle requirement of work avoids high temperature to make low temperature denitration catalyst permanent inactivation to send into low temperature denitration generator with the high temperature flue gas that satisfies the temperature requirement, make the ammonium sulfate salt in the low temperature denitration generator decompose into gas outgoing, thereby solve the sulfur dioxide poisoning problem of low temperature denitration catalyst, facilitate for the industrial application of low temperature denitration catalyst.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

fig. 1 shows according to the utility model discloses low temperature denitration catalyst regenerating unit's that embodiment provided structure schematic diagram.

Detailed Description

Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples.

Fig. 1 shows according to the utility model discloses low temperature denitration catalyst regenerating unit's that embodiment provided structure schematic diagram. The embodiment of the utility model provides a low temperature denitration catalyst regenerating unit includes flue gas pipeline 110, 111, 112, 113, gas pipeline 120, hot-blast combustion furnace 230, fan 210, 220 and low temperature denitration reactor 300. The hot-air combustion furnace 233 includes a first port 231, a second port 232, and a third port 233, the low-temperature denitration reactor 300 is a low-temperature denitration generator, and the low-temperature denitration reactor 300 contains a low-temperature denitration catalyst therein.

The flue gas pipeline 110, the flue gas pipeline 111, the low-temperature denitration reactor 300 and the flue gas pipeline 113 are sequentially connected, an input port of the fan 220 is connected to the flue gas pipeline 110, an output port of the fan 220 is connected to a third input port 233 of the hot air combustion furnace 230, the gas pipeline 120 is connected to a first port 231 of the hot air combustion furnace 230, an output port of the fan 210 is connected to a second port 232 of the hot air combustion furnace 230, an output port of the hot air combustion furnace 230 is connected to an input port of the flue gas pipeline 113, and an output port of the flue gas pipeline 113 is connected to.

The flue gas pipeline 110 inputs the raw flue gas after the desulfurization wet electric treatment, the raw flue gas enters the low-temperature denitration reactor 300 through the flue gas pipeline 111, then is treated into clean flue gas by the low-temperature denitration reactor 300, is sent out to enter the flue gas pipeline 112, and finally is discharged by the flue gas pipeline 112. Flue gas duct 112 may assist in limiting flue gas emissions, or flue gas treatment operations, of low temperature denitrification reactor 300.

The blower 210 outputs combustion-supporting gas, and the hot air combustion furnace 230 receives the combustion-supporting gas from the gas pipeline 120 and the combustion-supporting gas from the blower 210 to combust to generate high-temperature flue gas, and the high-temperature flue gas is sent into the flue gas pipeline 111 through the flue gas pipeline 113. The blower 210 is used for delivering combustion-supporting gas to the hot air combustion furnace 230, and the specific device may be a blower or other blowing devices. The fan 220 is used for extracting low-temperature raw flue gas from the pipeline 110 and sending the low-temperature raw flue gas into the hot air combustion furnace 230, and the function can also be realized by a one-way conduction pipeline without limitation, or the hot air combustion furnace 230 is directly connected with a clean air source. Wherein the fuel gas is sulfur-free fuel gas.

In this embodiment, the temperature of the raw flue gas is 65 ℃, the temperature of the high-temperature flue gas generated in the hot air combustion furnace 230 is extremely high, the fan 220 extracts the low-temperature raw flue gas from the flue gas pipe 110 and sends the low-temperature raw flue gas into the hot air combustion furnace 230, and performs preliminary cooling on the high-temperature flue gas, so that the temperature of the high-temperature flue gas entering the flue gas pipe 111 through the flue gas pipe 113 is reduced to 900 ℃, and the high-temperature flue gas of 900 ℃ is mixed with the raw flue gas of 65 ℃ in the flue gas pipe 111, so that the temperature of the flue gas entering the. The cooling measure can also increase the flue gas flow of the pipeline 110, and simultaneously control the flow of the high-temperature flue gas of the pipeline 113, so as to control the temperature of the flue gas entering the low-temperature denitration reactor 300 to be within the range of 320 ℃, and the flow requirement can be reduced by cooling for multiple times, thereby saving the corresponding operation cost.

The utility model discloses low temperature denitration catalyst regenerating unit's pipeline 110 mainly provides low temperature gas to reduce the temperature to 320 ℃ of the high temperature flue gas that fires the output of burning furnace 230, provide the high temperature flue gas of suitable temperature for low temperature denitration reactor 300, if the output flue gas temperature of burning furnace 230 is directly satisfied 320 ℃ temperature requirement to hot-blast alright with not using above-mentioned cooling measure. The cooling design of high-low temperature flue gas doping is used, the requirement on flue gas temperature can be guaranteed, proper flue gas flow can be guaranteed, doping output can fully utilize resources, and energy utilization efficiency can be improved. In addition, other cooling measures, such as water-cooled pipes, may also be added to the pipe 113.

The low-temperature denitration reactor 300 sequentially comprises a reserved layer 310, a first catalyst layer 321, a second catalyst layer 322 and a third catalyst layer 323 from an inlet to an outlet, and the low-temperature denitration reactor 300 is continuously fed with flue gas at 320 ℃ so that ammonium sulfate salt attached to the low-temperature denitration catalyst of the catalyst layer is decomposed into gas and discharged.

The low-temperature denitration reactor 300 further comprises a plurality of soot blowers 330, the soot blowers 330 are arranged at the positions of the first catalyst layer 321, the second catalyst layer 322 and the third catalyst layer 323, and output to the low-temperature denitration catalysts in the first catalyst layer 321, the second catalyst layer 322 and the third catalyst layer 323, so that ammonium sulfate in the decomposition process is cleaned in real time, ammonium sulfate dust particles on the surface are cleaned, ammonium sulfate is fully exposed, the decomposition speed can be increased, and raised ammonium sulfate dust particles can be decomposed more quickly. In this embodiment, soot blower 330 is the sound wave soot blower, possesses good soot blowing effect, comparatively adapts to the utility model discloses low temperature denitration catalyst regenerating unit of embodiment.

The embodiment of the utility model provides an in, the flue gas source of sending into low temperature denitration reactor 300 includes not containing sulphur or the extremely low former flue gas of sulphur content, gas and combustion-supporting gas, wherein the gas, combustion-supporting gas and partial former flue gas get into hot-blast burning furnace 230 and participate in the high temperature flue gas that the burning is suitable in order to produce the temperature, fan 220 is the temperature of reducing the high temperature flue gas and sends into the cold air to suitable and for hot-blast burning furnace 230, this cold air supply comes from former flue gas, the sulfur element that exceeds standard that can avoid other air supplies to contain gets into this system, cause secondary low temperature denitration catalyst sulfur dioxide poisoning, can also reduce low sulfur emission simultaneously, the protective.

Further, the embodiment of the utility model provides a low temperature denitration catalyst regenerating unit still includes fan 400 and flue 500, and the input port of fan 400 is connected with the output port of pipeline 112, and the output port of fan 400 is connected with the input port of flue 500. The fan 400 is a booster fan, and the output port of the flue 500 is a final discharge port of flue gas. The fan 400 can improve the flue gas conveying efficiency of the flue gas pipeline, and can convey high-pressure flue gas to the chimney 500 to ensure high air pressure in the chimney, so that the flue gas is further prevented from flowing backwards. Wherein, the chimney 500 can adopt a steel chimney, so that the service life of the chimney is prolonged.

The utility model discloses low temperature denitration catalyst regenerating unit can start when low temperature denitration system operation more than half a year or low temperature denitration system pressure differential surpass design pressure differential 20%, utilizes the high temperature flue gas more than 320 ℃ to last the sweep system, and the operation can guarantee that the ammonium sulfate salt is analytic finishes for 24 hours, solves the problem that ammonium sulfate salt blocks low temperature denitration catalyst hole, covers low temperature denitration catalyst and reduces catalyst efficiency. Regular maintenance in industrial production can practically guarantee the efficiency of industrial production equipment, 20% of excess pressure difference indicates that the hole is seriously blocked, the equipment needs to be maintained in time, and the actual operation can set maintenance time according to actual requirements. And, the utility model discloses low temperature denitration catalyst regenerating unit's flue gas input is two big, can directly be used for on line relieving the catalyst sulfur poisoning problem of the low temperature denitration catalyst module in the reaction tower.

Further, the embodiment of the utility model provides a low temperature denitration catalyst regenerating unit still includes control system and sensor, and the sensor includes temperature sensor, gas flowmeter and pressure sensor, and control system includes a plurality of valves, and this a plurality of valves can be used for the flow of control pipeline to controlgear's operation, sensor inspection portion installs in pipeline 110, 111, 112, 113 and low temperature denitration reactor 300, detects display system's temperature, pressure and flue gas flow, but monitored control system running state, flexible control. Detecting the pressure of the low-temperature denitration reactor 300 so as to compare the pressure with the design pressure difference, determining the maintenance time of the low-temperature denitration system, and regenerating and maintaining the low-temperature denitration catalyst in time to ensure the industrial production efficiency; the flue gas temperature and the flow in the pipeline can be monitored in cooperation with the temperature sensor and the flowmeter, the flue gas flow in each pipeline is controlled by the cooperation of the control system and the valve, and the flue gas mixing proportion is reasonably proportioned, so that flexible temperature control is realized, and the practicability of equipment is improved.

It can be known from the background art of the present specification that sulfur dioxide poisoning of the low-temperature denitration catalyst is mainly reflected in that ammonium sulfate blocks the pores of the catalyst and covers the catalyst, thereby reducing the activity of the catalyst. The main types of ammonium sulfate salts are ammonium sulfate, ammonium bisulfate and ammonium bisulfite, wherein the ammonium sulfate starts to decompose at 280 ℃, the decomposition product releases ammonia gas to generate ammonium bisulfate (ammonium bisulfate), the ammonium bisulfate starts to decompose into ammonia gas at 200 ℃, and the ammonium bisulfite sublimes and decomposes at 150 ℃. Therefore, the embodiment of the utility model provides a low temperature denitration catalyst regenerating unit can send into the high temperature flue gas more than 280 ℃ for low temperature denitration reactor 300, makes the ammonium sulfate salt decompose for gas completely, does not have and remains, and this gas of discharging to the sulfur dioxide poisoning state of the low temperature denitration catalyst in the low temperature denitration reactor 300 is relieved, accomplishes the regeneration of low temperature denitration catalyst. Wherein, the temperature of 320 ℃ can be set to prevent the flue gas temperature from being too high to destroy the structure of the low-temperature denitration catalyst so as to deactivate the catalyst. In consideration of the temperature loss of the flue gas in the gas circuit, 320 ℃ is a suitable optional temperature which is higher than 280 ℃ and does not become too high to permanently deactivate the low-temperature denitration catalyst, and is not limited only. The specific temperature value in the present specification does not limit actual production, and the temperature value may be used as a reference standard for actual operation.

In accordance with the embodiments of the present invention as set forth above, these embodiments are not exhaustive and do not limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and its various embodiments with various modifications as are suited to the particular use contemplated. The present invention is limited only by the claims and their full scope and equivalents.

Claims (8)

1. A low temperature denitration catalyst regeneration device, characterized by comprising:

the low-temperature denitration reactor comprises an input port and an output port, and a low-temperature denitration catalyst is arranged in the low-temperature denitration reactor;

the combustion furnace comprises a first input port for inputting fuel gas, a second input port for inputting combustion-supporting gas, an output port and an output port for outputting high-temperature flue gas;

and the temperature reduction pipeline comprises an input port and an output port, the input port of the temperature reduction pipeline is connected with the output port of the combustion furnace, and the output port of the temperature reduction pipeline is connected with the input port of the low-temperature denitration reactor.

2. The low-temperature denitration catalyst regeneration device according to claim 1, wherein the temperature reduction duct includes:

a first pipe including an input port and an output port, the output port of the first pipe being connected to the input port of the low-temperature denitration reactor;

a second pipe including an input port and an output port, the output port of the second pipe being connected with the input port of the first pipe; a third pipe including an input port and an output port, the output port of the third pipe being connected with the input port of the first pipe.

3. The apparatus for regenerating a low-temperature denitration catalyst according to claim 2, wherein the combustion furnace further comprises:

and a third input port for inputting cold air.

4. The apparatus for regenerating a low-temperature denitration catalyst according to claim 3, further comprising:

and the first fan comprises an input port and an output port, the input port of the first fan is connected with the third pipeline, and the input port of the first fan is connected with the third input port of the combustion furnace.

5. The apparatus for regenerating a low-temperature denitration catalyst according to any one of claims 1 to 4, characterized by further comprising:

and the fourth pipeline comprises an input port and an exhaust output port, and the input port of the fourth pipeline is connected with the output port of the low-temperature denitration reactor.

6. The apparatus for regenerating a low-temperature denitration catalyst according to claim 5, further comprising:

the second fan comprises an input port and an output port, and the input port of the second fan is connected with the output port of the fourth pipeline;

and the chimney comprises an air inlet port and an air outlet port, and the air inlet port of the chimney is connected with the output port of the second fan.

7. The apparatus for regenerating a low-temperature denitration catalyst according to claim 1, wherein the low-temperature denitration reactor comprises:

and the soot blower is positioned in the low-temperature denitration reactor, and the soot blowing position of the soot blower is matched with the position of the low-temperature denitration catalyst.

8. The apparatus for regenerating a low-temperature denitration catalyst according to claim 4, further comprising:

a plurality of temperature detectors disposed within the first, second, and third conduits;

a plurality of flow detectors disposed within the first, second, and third conduits;

at least one pressure detector disposed in the low-temperature denitration reactor;

a plurality of valves disposed on the passages of the first, second, and third conduits.

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