Sintering flue gas treatment device
By introducing a supplementary combustion heating system and a CO catalytic oxidation module into the sintering flue gas treatment device, combined with an ammonia injection system and a denitrification reactor, the problem of easy reduction of CO catalyst was solved, achieving efficient removal of CO and nitrogen oxides and improving heat recovery efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2026-04-10
AI Technical Summary
In existing technologies, the catalytic effect of CO catalysts is easily reduced during the treatment of sintering flue gas, and the heat recovery efficiency is not high, resulting in poor nitrogen oxide treatment.
Design a sintering flue gas treatment device, including a combustion heating system, a CO catalytic oxidation module, an ammonia injection system, a mixing component, and a denitrification reactor. CO is removed by heating and catalytic oxidation. After ammonia is injected, it is fully mixed in the mixing component and then carried out in the denitrification reaction, which reduces the contact between ammonia and CO catalyst and improves the catalytic effect.
It improved the catalytic efficiency of CO catalysts, reduced ammonia consumption, enhanced heat recovery efficiency, and improved the treatment effect of nitrogen oxides.
Smart Images
Figure CN224100390U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to sintering flue gas treatment technical field, especially sintering flue gas treatment device. BACKGROUND
[0002] Incomplete combustion of coke powder in sintering material and gas leakage in sintering ignition process often make sintering flue gas include CO (carbon monoxide) and nitrogen oxides, when sintering flue gas is treated, CO catalyst is often placed behind denitration catalyst layer, when sintering flue gas is denitrated, ammonia needs to be sprayed to sintering flue gas, ammonia and sintering flue gas react under the action of denitration catalyst layer, and the denitration of sintering flue gas is realized, and after passing through denitration catalyst layer, the ammonia that is not completely reacted reacts with CO catalyst, and the catalytic effect of CO catalyst is prone to reduce. SUMMARY
[0003] The utility model discloses a kind of sintering flue gas treatment devices, to improve the catalytic effect of CO catalyst is prone to reduce problem.
[0004] To achieve the above object, the sintering flue gas treatment device provided by the utility model comprises a flue system, the flue system comprises an inlet flue and an outlet flue located at two ends respectively;
[0005] The flue system is sequentially provided with a supplementary combustion and temperature rising system, a CO catalytic oxidation module, an ammonia injection system, a mixing assembly and a denitration reactor.
[0006] In an embodiment, the CO catalytic oxidation module comprises a non-noble metal catalyst layer.
[0007] In an embodiment, the mixing assembly comprises a static mixer.
[0008] In an embodiment, the mixing assembly comprises a plurality of guide plates.
[0009] In an embodiment, the flue system comprises a first pipe section, a second pipe section and a connecting pipe section, the connecting pipe section connects the first pipe section and the second pipe section, the inner diameter of the second pipe section is greater than that of the first pipe section, and the denitration reactor is located in the second pipe section.
[0010] In an embodiment, the flue system is provided with a flow regulation grid, and the flow regulation grid is located between the mixing assembly and the denitration reactor.
[0011] In an embodiment, the denitration reactor comprises a plurality of denitration catalyst layers arranged sequentially.
[0012] In an embodiment, the supplementary combustion and temperature rising system comprises a burner.
[0013] In an embodiment, the afterburning temperature raising system further comprises a heat storage guide plate, which is arranged corresponding to the flame outlet of the burner, and the burner and the heat storage guide plate are arranged in sequence.
[0014] In an embodiment, the sintering flue gas treatment device comprises a heat exchanger, which comprises a raw flue gas side and a clean flue gas side, the raw flue gas side is connected with the inlet flue, and the clean flue gas side is connected with the outlet flue.
[0015] The technical scheme of the utility model discloses a sintering flue gas treatment device, which comprises an inlet flue, an outlet flue, a first pipe section, a second pipe section, a connecting pipe section, a compensation temperature raising system, a CO catalytic oxidation module, an ammonia spraying system, a mixing assembly and a denitration reactor. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structure shown in these drawings without creative labor.
[0017] Figure 1 The structure diagram of the embodiment of the sintering flue gas treatment device provided by the utility model is shown.
[0018] Explanation of reference numerals:
[0019] 1, flue gas pipeline;11, inlet flue;12, outlet flue;13, first pipe section;14, second pipe section;15, connecting pipe section;151, guide plate;2, afterburning temperature raising system;21, burner;211, gas pipeline;212, gas regulating valve;22, heat storage guide plate;3, CO catalytic oxidation module;31, CO catalyst layer;4, ammonia spraying system;41, ammonia spraying grid;5, mixing assembly;51, static mixer;6, denitration reactor;61, denitration catalyst layer;7, heat exchanger;71, raw flue gas side;72, clean flue gas side;8, rectifying grid.
[0020] The purposes, functional features and advantages of the utility model will be further explained in combination with embodiments and with reference to the drawings. DETAILED DESCRIPTION
[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the utility model.
[0022] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.
[0023] In addition, if the embodiments of the utility model involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one feature. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.
[0024] Incomplete combustion of coke powder in sintering material and gas leakage in sintering ignition process often make the sintering flue gas include CO (carbon monoxide) and nitrogen oxides; sintering flue gas treatment mainly adopts the treatment process of desulfurization first and denitration later, CO is stable in chemical properties and insoluble in water, neither wet desulfurization nor semi-dry desulfurization can remove CO in flue gas, and the conventional SCR denitration process can only treat NOx in flue gas, flue gas does not participate in the reaction after entering the conventional SCR reactor, and finally can only be discharged with flue gas. CO is harmful to human health, and nitrogen oxides can form photochemical pollution through photochemical reaction.
[0025] In order to reduce the emission of CO and nitrogen oxides, the CO catalyst is usually arranged behind the denitration catalyst layer when the sintering flue gas is treated. When the sintering flue gas is subjected to denitration, ammonia needs to be sprayed into the sintering flue gas. Under the action of the denitration catalyst layer, the ammonia and the sintering flue gas are reacted, so that the denitration of the sintering flue gas is realized. After passing through the denitration catalyst layer, the unreacted ammonia is reacted with the CO catalyst. The catalytic effect and service life of the CO catalyst are easily reduced. Moreover, the heat released by the CO in the oxidized flue gas can only be recovered through a rotary heat exchanger, and the thermal efficiency is not high.
[0026] The utility model provides a kind of sintering flue gas treatment device.
[0027] Please refer to Figure 1 In an embodiment of the utility model, the sintering flue gas treatment device includes a flue system, the flue system includes an inlet flue 11 and an outlet flue 12 located at both ends respectively; a supplemental combustion temperature raising system 2, a CO catalytic oxidation module 3, an ammonia spraying system 4, a mixing assembly 5 and a denitration reactor 6 are sequentially arranged in the flue system.
[0028] The technical scheme of the utility model passes through the sintering flue gas into the inlet flue 11, the sintering flue gas is first heated after passing through the supplemental combustion temperature raising system, when the sintering flue gas after heating passes through the CO catalytic oxidation module 3, the CO catalytic oxidation module 3 can catalytically oxidize CO in the sintering flue gas, so as to remove CO in the sintering flue gas; the ammonia spraying system 4 can spray ammonia into the sintering flue gas after removing CO, realizing the mixing of ammonia and sintering flue gas, the sintering flue gas mixed with ammonia passes through the mixing assembly 5, which is conducive to fully mixing the sintering flue gas with ammonia, and finally catalytic reaction of nitrogen oxides in ammonia and sintering flue gas is carried out by means of the denitration reactor 6, the sintering flue gas after removing CO and nitrogen oxides flows out from the outlet flue 12. The contact of ammonia with the CO catalytic oxidation module 3 is reduced, and the problem of easily reducing the catalytic effect of the CO catalytic oxidation module 3 is improved.
[0029] The supplemental combustion temperature raising system 2 includes a burner 21. The flame center temperature of the burner 21 can exceed 1300 ℃, when the sintering flue gas passes through the flame outlet of the burner 21, the burner 21 can ignite part of CO in the sintering flue gas, thereby reducing the CO content in the sintering flue gas and realizing the heating of the sintering flue gas, so that the temperature of the sintering flue gas is increased.
[0030] The burner 21 is matched with an automatic air distribution system for ensuring complete combustion of gas, thereby reducing the increase of CO concentration in the sintering flue gas.
[0031] Please refer to Figure 1The gas inlet of the burner 21 is connected with a gas pipeline 211, one end of the gas pipeline 211 is located outside the flue gas pipeline 1, and a gas adjusting valve 212 is arranged on the gas pipeline 211. By means of the gas adjusting valve 212, the gas supply amount of the gas pipeline 211 can be adjusted to adjust the combustion intensity of the burner 21, so as to adjust the heating effect of the sintering flue gas. The gas adjusting valve is located outside the flue gas pipeline 1, which can facilitate the adjustment of the gas adjusting valve 212. The gas pipeline 211 can be connected with a low-calorific-value gas pipeline, thereby reducing the combustion cost of the burner 21.
[0032] Please refer to Figure 1 The supplemental combustion temperature raising system 2 further comprises a heat storage guide plate 221, which is arranged corresponding to the flame outlet of the burner 21, and the burner 21 and the heat storage guide plate 221 are arranged in sequence. When the burner 21 is burning, the flame of the burner 21 can heat the heat storage guide plate 221, thereby increasing the temperature of the heat storage guide plate 221. When the sintering flue gas passes through the heat storage guide plate 221, the heat storage guide plate 221 can guide the flow of the sintering flue gas, and the heat storage guide plate 221 increases the heating area of the sintering flue gas, thereby improving the heating effect of the heat storage guide plate 221, and the heat storage guide plate 221 is beneficial to the temperature raising of CO and the reaction with oxygen.
[0033] In order to raise the temperature of the sintering flue gas and improve the utilization of the sintering flue gas flowing out of the outlet flue 12, the sintering flue gas treatment device comprises a heat exchanger 7, which comprises a raw flue gas side 71 and a clean flue gas side 72. The raw flue gas side 71 is connected with the inlet flue 11, and the clean flue gas side 72 is connected with the outlet flue 12. By means of the heat exchanger 7, the sintering flue gas flowing out of the outlet flue 12 can compensate and raise the temperature of the sintering flue gas flowing into the inlet flue 11, thereby improving the waste heat utilization of the sintering flue gas flowing out of the outlet flue 12. The preheating of the sintering flue gas to be treated can be realized, thereby reducing the consumption of the burner 21 when heating the sintering flue gas.
[0034] The heat exchanger 7 is preferably a rotary heat exchanger 7, which is connected with an induced draft fan. The induced draft fan can introduce part of the sintering flue gas in the outlet flue 12 into the rotary heat exchanger as sealing air, thereby reducing the leakage of low-temperature and high-pollution-concentration sintering flue gas in the raw flue gas side 71 into the clean flue gas side 72.
[0035] Please refer to Figure 1The CO catalytic oxidation module 3 comprises a plurality of CO catalyst layers 31, the plurality of CO catalyst layers 31 are sequentially arranged and have gaps between the plurality of CO catalyst layers 31, when the sintering flue gas after being heated passes through the CO catalyst layers 31, the CO catalyst layers 31 can accelerate the catalytic oxidation of CO, the plurality of CO catalyst layers 31 can catalytically oxidize the sintering flue gas for multiple times, which is beneficial to fully remove the CO in the sintering flue gas.
[0036] In the embodiment, the CO catalyst layer 31 is preferably two layers.
[0037] The CO catalytic oxidation module 3 comprises a non-noble metal catalyst layer. The non-noble metal catalyst can be Fe, Cu, V or Ce, CO and oxygen can react to generate carbon dioxide under the catalysis of the non-noble metal catalyst, so as to remove the CO in the sintering flue gas, in addition, the non-noble metal catalyst can catalyze the reaction of CO and nitrogen oxides, so as to simultaneously remove the CO and part of the nitrogen oxides in the sintering flue gas, and the consumption of ammonia is reduced.
[0038] One or part of the plurality of CO catalyst layers 31 can be arranged as a non-noble metal catalyst layer, or the plurality of CO catalyst layers 31 can all be arranged as non-noble metal catalyst layers.
[0039] The ammonia injection system 4 comprises a plurality of ammonia nozzles, the plurality of ammonia nozzles are matched, which is beneficial to uniformly inject ammonia into the sintering flue gas.
[0040] In another embodiment, the ammonia injection system 4 comprises an ammonia injection grid 41, the ammonia injection grid 41 is arranged along the cross section of the flue gas duct 1, a plurality of ammonia nozzles are uniformly arranged on one side of the ammonia injection grid 41, by means of the ammonia injection grid 41, the ammonia can be uniformly injected into the sintering flue gas.
[0041] The mixing assembly 5 comprises stirring blades arranged in the flue gas duct 1, when the stirring blades rotate, the mixing of the sintering flue gas and ammonia in the flue gas duct 1 can be accelerated.
[0042] In another embodiment, the mixing assembly 5 comprises a static mixer 51. When the ammonia and the sintering flue gas pass through the static mixer 51, the directions of the sintering flue gas and the ammonia change multiple times, which improves the mixing effect of the sintering flue gas and the ammonia.
[0043] The flue system comprises a first pipe section 13, a second pipe section 14 and a connecting pipe section 15, the connecting pipe section 15 connects the first pipe section 13 and the second pipe section 14, the inner diameter of the second pipe section 14 is larger than that of the first pipe section 13, and the denitration reactor 6 is located in the second pipe section 14. The second pipe section 14 slows down the moving speed of the sintering flue gas and ammonia in the denitration reactor 6, prolongs the contact time of the sintering flue gas and ammonia with the denitration reactor 6, and is beneficial to fully denitrate the sintering flue gas.
[0044] The flue system is provided with a flow regulation grid 8 located between the mixing assembly 5 and the denitration reactor 6. The flow regulation grid 8 is located at one end of the second pipe section 14 close to the connecting pipe section 15. When the sintering flue gas passes through the flow regulation grid 8, the flow regulation grid 8 can guide the flow of the sintering flue gas, reduce the flow speed difference of the sintering flue gas after the flow regulation grid 8, and reduce the flow speed difference of the sintering flue gas at each position in the second pipe section 14.
[0045] In order to guarantee the flow regulation effect of the flow regulation grid 8 on the sintering flue gas, the aperture of the grid holes of the flow regulation grid 8 can be set according to requirements.
[0046] The denitration reactor 6 comprises a plurality of layers of denitration catalyst layers 61 arranged in sequence. The plurality of layers of denitration catalyst layers 61 can denitrate the sintering flue gas multiple times, which is beneficial to guarantee the denitration effect on the sintering flue gas. In the embodiment of the application, the denitration catalyst layer 61 is arranged in four layers.
[0047] The first pipe section 13 and the second pipe section 14 are parallel, the inner diameter of the connecting pipe section 15 gradually increases from the first pipe section 13 to the second pipe section 14, and the connecting pipe section 15 is curved.
[0048] The connecting pipe section 15 is provided with a plurality of flow guide plates 151. When the ammonia and sintering flue gas contact the flow guide plates 151, the flow direction is deviated. The flow guide plates 151 can guide the flow of the ammonia and sintering flue gas, and the bending direction of the flow guide plates 151 is mixed with the bending direction of the connecting section, which can reduce the impact on the inner wall of the connecting section.
[0049] The CO oxidation catalytic module, the ammonia injection system 4 and the static mixer 51 are located in the first pipe section 13.
[0050] The burner 21 and the heat accumulation flow guide plate 221 are both located in the first pipe section 13.
[0051] In another embodiment, the burner 21 and the regenerative guide plate 221 are located in the inlet flue 11, and the burner 21 and the original flue gas side 71 are sequentially arranged along the sintering flue gas flow direction in the inlet flue 11, which guarantees the preheating of the sintering flue gas before the heat exchanger 7 heats the burner 21.
[0052] The above is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.
Claims
1. A sintering off-gas treatment device, characterized by, The flue system comprises an inlet flue and an outlet flue at two ends respectively; A combustion temperature raising system, a CO catalytic oxidation module, an ammonia injection system, a mixing assembly and a denitration reactor are sequentially arranged in the flue system; The combustion temperature raising system comprises a burner. The combustion temperature raising system further comprises a heat storage guide plate, which is arranged corresponding to the flame outlet of the burner, and the burner and the heat storage guide plate are sequentially arranged.
2. The sintering off-gas treatment device according to claim 1, wherein The CO catalytic oxidation module comprises a non-noble metal catalyst layer.
3. The sintering off-gas treatment device according to claim 1, wherein The mixing assembly comprises a static mixer.
4. The sintering off-gas treatment device according to claim 1, wherein The flue system comprises a first pipe section, a second pipe section and a connecting pipe section, the connecting pipe section connects the first pipe section and the second pipe section, the inner diameter of the second pipe section is larger than that of the first pipe section, and the denitration reactor is arranged in the second pipe section.
5. The sintering off-gas treatment device according to claim 4, wherein A plurality of guide plates are arranged in the connecting pipe section.
6. The sintering off-gas treatment device according to claim 1, wherein A flow regulation grid is arranged in the flue system, and the flow regulation grid is arranged between the mixing assembly and the denitration reactor.
7. The sintering off-gas treatment device according to claim 1, wherein The denitration reactor comprises a plurality of denitration catalyst layers arranged sequentially.
8. The sintering off-gas treatment device according to claim 1, wherein The sintering flue gas treatment device comprises a heat exchanger, the heat exchanger comprises a raw flue gas side and a clean flue gas side, the raw flue gas side is connected with the inlet flue, and the clean flue gas side is connected with the outlet flue.