CN214861949U - Urea pyrolysis furnace export product gas purifier - Google Patents
Urea pyrolysis furnace export product gas purifier Download PDFInfo
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- CN214861949U CN214861949U CN202120573983.3U CN202120573983U CN214861949U CN 214861949 U CN214861949 U CN 214861949U CN 202120573983 U CN202120573983 U CN 202120573983U CN 214861949 U CN214861949 U CN 214861949U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The utility model relates to a urea pyrolysis oven export product gas purifier, pyrolysis oven and the inside intercommunication of box, box top intercommunication air-purifying chamber communicates to follow-up ammonia spraying pipeline again, and the ash bucket rather than inside cavity intercommunication is established to the bottom half, and in the box, be located the ash bucket top and establish the filter bag, in the box, be located the ash bucket top selectivity and establish the guide plate, the filter bag top sets up sweeps the pipe, sweeps and establishes the solenoid valve on the pipe, and the solenoid valve is connected with the controller output, and the controller input is connected with differential pressure caliber. The utility model provides a urea pyrolysis furnace export product gas purifier sets up the box of dust removal usefulness in the pyrolysis furnace export, carry the pyrolysis furnace to follow-up desorption such as dust, crystallisate in spouting the product gas of ammonia pipeline through a plurality of filter bags in the box, avoid producing wearing and tearing, accumulation, jam etc. at follow-up ammonia pipeline of spouting, avoid appearing the uneven condition of export NOx concentration distribution, reduce denitration export ammonia escape, guarantee equipment normal operating, the extension equipment life, reduce the maintenance cost.
Description
Technical Field
The utility model belongs to the technical field of urea pyrolysis oven gas purification device, concretely relates to urea pyrolysis oven export product gas purification device.
Background
With the stricter NOx emission standard, NH is generally installed in coal-fired power plants in China3Method SCR flue gas denitrification facility. The reducing agent of the SCR flue gas denitration device is mainly ammonia gas, and the preparation of the ammonia gas is generally carried out by a liquid ammonia evaporation method, an ammonia evaporation method, a urea hydrolysis method, a urea pyrolysis method and the like. The ammonia evaporation method is mainly applied to small-capacity units because of low ammonia concentration and large evaporation and gasification energy consumption; the liquid ammonia evaporation method has low initial investment and operation cost and wide engineering application, but the storage, transportation and use of the liquid ammonia as a dangerous chemical are strictly limited by relevant national laws and regulations, and the technology of preparing ammonia from urea instead of the liquid ammonia is clearly suggested in the current relevant specifications and policy documents.
The main equipment of the existing urea pyrolysis ammonia production system comprises a urea dissolving tank, a urea dissolving pump, a urea solution storage tank, a liquid supply pump, a metering and distributing device, a back pressure control valve, a heat insulation decomposition chamber (containing an injector), a high-temperature flue gas heat exchanger or an electric heater, a control device and the like, wherein urea particles are firstly conveyed to the urea dissolving tank, dissolved into urea solution with the mass fraction of about 50 percent by water, and then introduced into the urea dissolving tankConveying the urea solution to a urea solution storage tank by a liquid supply pump; then the urea solution enters into the heat insulation decomposition chamber through a liquid supply pump, a metering and distributing device, an atomizing nozzle and the like, and is decomposed at 350-650 ℃ to generate NH3、H2O and CO2And the decomposition products enter the SCR system through an ammonia injection system. The urea pyrolysis reaction adopts a mature dilution air heating mode which is an electric heating mode and a high-temperature flue gas heat exchange mode. Generally, the energy consumption of the electric heater is higher than that of the high-temperature flue gas heat exchanger, and the high-temperature flue gas heat exchanger is usually adopted and has two arrangement modes of an external furnace and an internal furnace.
The external high-temperature flue gas heat exchanger is characterized in that the high-temperature flue gas heat exchanger is arranged outside a boiler, high-temperature flue gas at the temperature of 600-750 ℃ is led out from a flue superheater or a reheater by a pipeline, and the high-temperature flue gas returns to the inlet of an air preheater after heat exchange. Because the external smoke heat exchanger is small in induced smoke, the external smoke heat exchanger has small influence on a boiler, is convenient to construct and maintain, is easy to arrange and is widely applied. However, the external high-temperature flue gas heat exchanger can only use hot primary air as dilution air, and the dust contained in the hot primary air can cause the blockage and abrasion of equipment (including downstream ammonia spraying pipelines and valves).
The practical application case of the urea pyrolysis furnace shows that the urea pyrolysis can not be completely pyrolyzed to generate crystals and cause the blockage of subsequent equipment due to various reasons, such as the non-uniform flow field and temperature field in the pyrolysis furnace, the difference of the atomization effect of the spray gun, poor heat preservation, the change of load and coal grinding groups and the like.
In summary, the urea pyrolysis method using the external high-temperature flue gas heat exchanger can cause the blockage and abrasion of equipment (mainly a downstream ammonia injection pipeline and a downstream valve) in the actual operation due to the existence of dust contained in hot primary air and incomplete generation of crystals by urea pyrolysis. The blockage of the ammonia injection valve and the pipeline can further cause no ammonia to enter the reactor in the area corresponding to the branch pipe, the concentration of local NOx is higher, in order to meet the requirement of environment-friendly ultralow emission, the NOx in the chimney is not overproof, only ammonia can be excessively injected, the concentration of NOx in other areas is extremely low, even 0, the ammonia escape is extremely high, and the blockage of a follow-up air preheater is extremely easy to cause. When the ammonia injection pipeline is blocked more, the problems that the concentration of NOx in the chimney exceeds the standard and the environment is difficult to reach the standard can be caused.
Chinese patent, publication No.: CN209530547U discloses a dust removal type SCR urea pyrolysis device, which comprises a hot air inlet part, a dust removal part and a heating ammonia production part, wherein the hot air inlet part comprises a first valve plate, a pipeline and a flowmeter; the dust removing part comprises a multi-tube dust remover, a second valve plate and a flowmeter; the heating ammonia-generating part comprises an electric heater, a third valve plate and a pyrolysis furnace, and the patent adds a multi-pipe dust remover in the whole process equipment to remove dust contained in dilution air and avoid equipment abrasion caused by excessive dust. However, the problem of blocking the ammonia injection pipe is not solved by the patent, except for dust contained in the hot primary air, and incomplete crystals generated in the pyrolysis furnace, which can cause abrasion and blocking of subsequent equipment.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems in the prior art, the utility model aims to provide a gas purification device for the outlet product of a urea pyrolysis furnace.
In order to realize the above purpose, reach above-mentioned technological effect, the utility model discloses a technical scheme be:
the utility model provides a urea pyrolysis oven export product gas purifier, including the pyrolysis oven, differential pressure measurement ware and controller, pyrolysis oven and the inside cavity intercommunication of box, box top intercommunication air-purifying chamber feeds through to follow-up ammonia injection pipeline again, the bottom half sets up the ash bucket rather than the inside cavity intercommunication, in the box, it sets up the filter bag to be located the ash bucket top, in the box, it sets up the guide plate to be located ash bucket top selectivity, the filter bag with \ or guide plate top sets up sweeps the pipe, it sets up the solenoid valve on the pipe to sweep, the solenoid valve is connected with the controller output, the controller input is connected with differential pressure measurement ware, product gas in the pyrolysis oven circulates to follow-up ammonia injection pipeline through the air-purifying chamber after the filter bag filters.
Furthermore, the pyrolysis furnace is communicated with the cavity inside the box body sequentially through the product gas conveying pipeline and the dust-containing gas inlet, and the gas purifying chamber is communicated with the subsequent ammonia spraying pipeline through the gas purifying outlet.
Furthermore, the filter bags are provided with a plurality of filter bags which are sequentially hung on a top plate in the box body, and each filter bag is opened into a cavity with a certain shape through a built-in bag cage.
Furthermore, a guide plate is arranged in a part of the space inside the box body and close to the pyrolysis furnace, the rest part inside the box body is a filter bag, and the filter bag does not completely occupy the inside of the whole box body.
Furthermore, one end of the purging pipe is communicated with the air bag, and the other end, opposite to the purging pipe, extends into the box body.
Furthermore, an ash discharging valve is arranged on the ash hopper, and whether the materials in the ash hopper are discharged or not is controlled by opening and closing the ash discharging valve.
Furthermore, the cross section of the ash bucket is of an inverted triangle structure, and the ash discharge valve is arranged at the bottommost part of the ash bucket.
Furthermore, the filter bag is made of alloy fiber.
Further, the filter bag is prepared by the following steps:
step 1), preparing alloy short fibers with the fiber length of 32-58 mm;
the alloy short fiber is formed by cutting an alloy long fiber by adopting the existing method, and the alloy long fiber is preferably a nickel-based alloy long fiber;
step 2), putting the alloy short fibers obtained in the step 1) into a methyl cellulose solution with the concentration of 3-4%, fully and uniformly stirring, then putting into a stainless steel fiber net, extracting a liquid phase, and laying a layer of uniform alloy short fibers on the surface of the stainless steel fiber net;
step 3), flattening the product obtained in the step 2) and the stainless steel fiber felt by using a rolling mill to form a pressing roller, wherein the flatness is 1mm, sintering the product in vacuum at the vacuum degree of 0.02Pa and the temperature of 1800 ℃, keeping the temperature for 7-8h, and quickly cooling the product; wherein the aperture of the stainless steel fiber felt is 30-110 μm;
and 4) arranging a catalyst layer or a polytetrafluoroethylene layer on the surface of the product obtained in the step 3), wherein the pore diameters of the catalyst layer and the polytetrafluoroethylene layer are respectively 0.6-1.2 mu m.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a urea pyrolysis oven export product gas purifier, including pyrolysis oven, differential pressure measurement ware and controller, pyrolysis oven and the inside cavity intercommunication of box, box top intercommunication air-purifying chamber feeds through to follow-up ammonia injection pipeline again, the bottom half sets up the ash bucket rather than the inside cavity intercommunication, in the box, be located the ash bucket top and set up the filter bag, in the box, be located ash bucket top selectivity and set up the guide plate, the filter bag with \ or guide plate top sets up the pipe that sweeps, set up the solenoid valve on the pipe that sweeps, the solenoid valve is connected with the controller output, the controller input is connected with differential pressure measurement ware, product gas in the pyrolysis oven circulates to follow-up ammonia injection pipeline through the air-purifying chamber after the filter bag filters. The utility model provides a pair of urea pyrolysis furnace export product gas purifier, set up the box of dust removal usefulness in the pyrolysis furnace export, carry the pyrolysis furnace to follow-up dust in the product gas of spouting ammonia pipeline (ammonia injection grid), desorption such as crystallisate through a plurality of filter bags in the box, avoid producing wearing and tearing at follow-up ammonia injection pipeline, the accumulation, block up etc., further avoid appearing exporting the uneven condition of NOx concentration distribution, reduce denitration export ammonia escape, guarantee equipment normal operating, prolong equipment life, reduce the maintenance cost.
Drawings
Fig. 1 is a schematic structural view of the present invention;
wherein: 1. a pyrolysis furnace; 2. a product gas delivery conduit; 3. a dusty gas inlet; 4. a baffle; 5. a differential pressure measurer; 6. a controller; 7. air bags; 8. an electromagnetic valve; 9. a purified gas outlet; 10. a gas purifying chamber; 11. a purge tube; 12. a top plate; 13. a filter bag; 14. a bag cage; 15. a box body; 16. an ash hopper; 17. and (4) an ash discharge valve.
Detailed Description
The embodiments of the present invention are described in detail below to make the advantages and features of the present invention easier to understand by those skilled in the art, thereby making more clear and definite definitions of the protection scope of the present invention.
SCR: selective Catalytic Reduction, Chinese is called SCR for short. The SCR denitration technology means that reducing agents (such as liquid ammonia, urea, ammonia water and the like) are selectively mixed with flue gas in a catalyst at the temperature of 280-420 DEG CTo form pollution-free N2And H2NOx abatement technology for O.
As shown in figure 1, the device for purifying the product gas at the outlet of the urea pyrolysis furnace takes the technical idea of reducing the blockage of downstream equipment caused by gas dust and crystal substances as the starting point, and comprises a pyrolysis furnace 1, a product gas conveying pipeline 2, a dust-containing gas inlet 3, a guide plate 4, a differential pressure measurer 5, a controller 6, a gas bag 7 and an electromagnetic valve 8, net gas export 9, air-purifying chamber 10, sweep pipe 11, roof 12, filter bag 13, bag cage 14, box 15, ash bucket 16 and unloading valve 17, pyrolysis oven 1 loops through product gas pipeline 2 and dusty gas import 3 and communicates to the inside cavity of box 15, box 15 top intercommunication air-purifying chamber 10, air-purifying chamber 10 communicates the follow-up ammonia injection pipeline through net gas export 9, the product gas in pyrolysis oven 1 is rethread air-purifying chamber 10 circulation to follow-up ammonia injection pipeline after guide plate 4 deflection and the filter bag 10 filtration in the box 15. The bottom of the box body 15 is provided with a dust hopper 16 communicated with an inner cavity of the box body, the dust hopper 16 is provided with a dust discharge valve 17, whether materials in the dust hopper 16 are discharged is controlled by opening and closing the dust discharge valve 17, a guide plate 4 and a plurality of filter bags 13 are arranged in the box body 15 and above the dust hopper 16, the filter bags 13 are sequentially hung on a top plate 12 arranged in the box body 15, each filter bag 13 is opened into a cavity with a certain shape through a built-in bag cage 14, the gas flowing from the pyrolysis furnace 1 to the gas purification chamber 10 is not influenced by the existence of the top plate 12, the guide plate 4 is arranged at one side of each filter bag 13, a purging pipe 11 is arranged above the guide plate 4 and the filter bags 13, the purging pipe 11 is communicated with the gas bag 7, the purging pipe 11 is provided with an electromagnetic valve 8, the output end of the controller 6 is communicated with the electromagnetic valve 8 and controls whether the purging pipe 11 is purged by controlling the opening and closing of the electromagnetic valve 8, when the purging pipe 11 purges, dust, crystals and the like attached to the dust and crystals on the filter bags 13 can be purged to the dust hopper 16, the recycling of the filter bag 13 is realized, the box body 15 is also provided with a differential pressure measurer 5 connected with the input end of the controller 6, the resistance between the dust-containing gas inlet 3 and the gas purifying chamber 10 is measured through the differential pressure measurer 5 and is transmitted to the controller 6 for analysis and treatment, and the controller 6 controls the purging pipe 11 to perform purging operation or not according to the treatment result. Specifically, the differential pressure measurer 5 is used for measuring the pressure difference between two positions on the box body 15 below the air purifying chamber 10, one is an inlet (an inlet position connected between the product gas conveying pipeline 2 and the box body 15), and the other is an outlet (an outlet position connected between the air purifying chamber 10 and the box body 15), data detected by the differential pressure measurer 5 can be uploaded to the controller 6 to be processed, a resistance signal can be transmitted to the controller 6, when the whole device starts to operate, the section of smoke resistance under a certain smoke amount is certain, along with the operation of the device, dust can be deposited on the filter bag 13, the resistance can rise at the moment, the controller 6 receives data transmitted by the differential pressure measurer 5 in real time, the resistance rises to a certain degree, the controller 6 can act, and the controller 6 opens the purging pipe 11 for blowing the dust collected on the filter bag 13 into the dust hopper 16.
The differential pressure measurer 5 has more models, and the utility model discloses in adopt ordinary U type pipe can.
The 1 exit temperature of pyrolysis furnace is greater than 300 ℃ usually, contains corrosive gas simultaneously, consequently the utility model discloses a filter bag 13 adopts the alloy fiber filter bag, and the substrate of alloy fiber filter material adopts the stainless steel material that has intensity height, high temperature resistant (600 ℃), corrosion resistance usually, and alloy fiber filter bag rigidity is big, intensity is high, has good anti mechanical shock and temperature shock resistance, wearability, is applicable to the desorption of dust and crystal in the pyrolysis furnace export gas.
The preparation method of the filter bag 13 comprises the following steps:
step 1), preparing alloy short fibers with the fiber length of 32-58 mm;
the alloy short fiber is formed by cutting an alloy long fiber by adopting the existing method, and the alloy long fiber is preferably a nickel-based alloy long fiber;
step 2), putting the alloy short fibers obtained in the step 1) into a methyl cellulose solution with the concentration of 3-4%, fully and uniformly stirring, then putting into a stainless steel fiber net, extracting a liquid phase, and laying a layer of uniform alloy short fibers on the surface of the stainless steel fiber net;
step 3), flattening the product obtained in the step 2) and the stainless steel fiber felt by using a rolling mill to form a pressing roller, wherein the flatness is 1mm, sintering the product in vacuum at the vacuum degree of 0.02Pa and the temperature of 1800 ℃, keeping the temperature for 7-8h, and quickly cooling the product; wherein the aperture of the stainless steel fiber felt is 30-110 μm;
and 4) arranging a catalyst layer or a polytetrafluoroethylene layer on the surface of the product obtained in the step 3), wherein the pore diameters of the catalyst layer and the polytetrafluoroethylene layer are respectively 0.6-1.2 mu m.
It should be noted that the utility model discloses can set up guide plate 4 according to actual demand selectivity. If the guide plate 4 is not arranged, the smoke can collide with the rear wall of the box body 15 after entering the box body 15 from the dust-containing gas inlet 3 along the horizontal direction, and then the smoke can flow to the outlet because only one outlet is arranged above the box body 15, and the smoke can be captured on the filter bag 13 at this time, so that the function of the device can not be influenced if the guide plate 4 is not added; the guide plate 4 is additionally arranged, so that a deflection process is formed when the flue gas enters the box body 15 conveniently, the flowing track of the flue gas can be combed, the flue gas flows naturally, and the resistance is reduced. The part of the space of the box body 15 close to the dust-containing gas inlet 3 is the guide plate 4, the rest part is the filter bag 13, and the filter bag 13 does not completely occupy the whole box body 15.
The utility model discloses a theory of operation does:
the product gas obtained after the pyrolysis reaction in the pyrolysis furnace 1 enters a product gas conveying pipeline 2, then enters a box body 15 through a dust-containing gas inlet 3, is deflected under the action of a guide plate 4, part of large-particle dust or crystals directly fall into a dust hopper 16 under the action of inertia, the gas flows to a filter bag 13 after being deflected by the guide plate 4, the dust and the crystals are captured and stopped on the filter bag 13 in a pore in the filter bag 13, the clean gas continuously flows upwards to a gas purification chamber 10, and finally flows to a subsequent ammonia spraying pipeline through a gas purification outlet 9, and the arrow direction shown in fig. 1 is the gas flow direction;
the resistance between the dust-containing gas inlet 3 and the gas purifying chamber 10 is measured by the differential pressure measurer 5, after the device operates for a period of time, the resistance of gas flowing through the filter bag 13 is increased along with the increase of dust and crystals accumulated on the filter bag 13, when the resistance critical value is reached, the controller 6 transmits a signal to the electromagnetic valve 8, the electromagnetic valve 8 controls the blowing pipe 11 to blow through the control gas bag 7, the dust and the crystals attached to the filter bag 13 are blown to the dust hopper 16, and the dust and the crystals in the dust hopper 16 are discharged through the dust discharging valve 17.
The utility model discloses the part of not specifically describing adopt prior art can, do not describe here any more.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (8)
1. The utility model provides a urea pyrolysis oven export product gas purifier, a serial communication port, including pyrolysis oven, differential pressure measurement ware and controller, pyrolysis oven and the inside cavity intercommunication of box, box top intercommunication air-purifying chamber feeds through to follow-up ammonia injection pipeline again, the bottom half sets up the ash bucket rather than the inside cavity intercommunication, in the box, be located the ash bucket top and set up the filter bag, in the box, it sets up the guide plate to be located ash bucket top selectivity, the filter bag with \ or guide plate top sets up sweeps the pipe, it sets up the solenoid valve on the pipe to sweep, the solenoid valve is connected with the controller output, the controller input is connected with differential pressure measurement ware, product gas in the pyrolysis oven circulates to follow-up ammonia injection pipeline through the air-purifying chamber after the filter bag filters.
2. The urea pyrolysis furnace outlet product gas purification device as claimed in claim 1, wherein the pyrolysis furnace is communicated with the cavity inside the box body sequentially through the product gas conveying pipeline and the dust-containing gas inlet, and the gas purification chamber is communicated with the subsequent ammonia injection pipeline through the gas purification outlet.
3. The device for purifying the product gas at the outlet of the urea pyrolysis furnace as claimed in claim 1, wherein the filter bags are provided with a plurality of filter bags and are sequentially hung on a top plate inside the box body, and each filter bag is expanded into a cavity with a certain shape through an internally-arranged bag cage.
4. The device for purifying the product gas at the outlet of the urea pyrolysis furnace as claimed in claim 1, wherein a guide plate is arranged in a part of the interior of the box body close to the pyrolysis furnace, the rest of the interior of the box body is a filter bag, and the filter bag does not completely occupy the whole interior of the box body.
5. The urea pyrolysis furnace outlet product gas purification device of claim 1, wherein one end of the purging pipe is communicated with the gas bag, and the other end, opposite to the purging pipe, of the purging pipe extends into the box body.
6. The device for purifying the product gas at the outlet of the urea pyrolysis furnace as claimed in claim 1, wherein the ash hopper is provided with an ash discharge valve, and whether the material in the ash hopper is discharged or not is controlled by opening and closing the ash discharge valve.
7. The urea pyrolysis furnace outlet product gas purification device as claimed in claim 6, wherein the section of the ash bucket is in an inverted triangle structure, and the ash discharge valve is arranged at the bottommost part of the ash bucket.
8. The urea pyrolysis furnace outlet product gas purification device as claimed in claim 1, wherein the filter bag is made of alloy fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120573983.3U CN214861949U (en) | 2021-03-22 | 2021-03-22 | Urea pyrolysis furnace export product gas purifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120573983.3U CN214861949U (en) | 2021-03-22 | 2021-03-22 | Urea pyrolysis furnace export product gas purifier |
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| CN214861949U true CN214861949U (en) | 2021-11-26 |
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| CN202120573983.3U Active CN214861949U (en) | 2021-03-22 | 2021-03-22 | Urea pyrolysis furnace export product gas purifier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115041019A (en) * | 2022-06-16 | 2022-09-13 | 大唐环境产业集团股份有限公司 | SCR denitration urea pyrolysis ammonia production system of gas-steam combined cycle unit |
-
2021
- 2021-03-22 CN CN202120573983.3U patent/CN214861949U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115041019A (en) * | 2022-06-16 | 2022-09-13 | 大唐环境产业集团股份有限公司 | SCR denitration urea pyrolysis ammonia production system of gas-steam combined cycle unit |
| CN115041019B (en) * | 2022-06-16 | 2023-10-03 | 大唐环境产业集团股份有限公司 | SCR denitration urea pyrolysis ammonia production system of gas-steam combined cycle unit |
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