Energy-saving flue gas carbon monoxide removal and denitration system

Abstract

The utility model discloses an energy-saving flue gas carbon monoxide removal and denitration system, and belongs to the field of environmental protection of atmospheric control of iron and steel plants. The system comprises a carbon monoxide catalyst, a denitration reactor and a flue gas pipeline, one end of the flue gas pipeline is communicated with the upstream of the denitration reactor, and the carbon monoxide catalyst is arranged in the flue gas pipeline at the upstream of the denitration reactor. When the system runs, carbon monoxide in flue gas is catalyzed by the carbon monoxide catalyst to react to generate carbon dioxide, and a large amount of heat is released to heat the flue gas and reduce the heat compensation temperature of the flue gas heater, so that the consumption of blast furnace gas is reduced, the running energy consumption is saved, and the system runs stably. The carbon monoxide catalyst is installed in the flue gas pipeline or the denitration reactor, installation is convenient, space is saved, a steel frame and a reactor do not need to be newly built, the carbon monoxide catalyst can be overhauled through a denitration reactor overhauling hoist, additional reactors or overhauling measures do not need to be arranged, and the construction cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of steel plant air treatment environmental protection, concretely relates to an energy -conserving flue gas decarburization denitration system. BACKGROUND

[0002] In order to meet the reaction temperature required by SCR denitration, the flue gas needs to be heat exchanged by GGH, and the additional heat (terminal difference) required by GGH needs to be provided by hot blast furnace, the hot blast furnace heats the flue gas by burning blast furnace gas, and the high-temperature flue gas after heating is used to heat exchange the original flue gas in GGH to achieve balance. The hot blast furnace consumes a large amount of coal gas energy to heat the flue gas. A small amount of carbon monoxide in the flue gas and a small amount of unburned carbon monoxide in the blast furnace gas will compete with nitrogen oxides (NOx) for active sites on the catalyst surface, thereby reducing the efficiency of the denitration reaction. In addition, carbon monoxide may also form new compounds with other reaction products, further affecting the denitration effect.

[0003] The prior art removes carbon monoxide in flue gas by adding a carbon monoxide catalyst, such as patent CN117815897A discloses a carbon monoxide removal device, a bypass is added at the outlet of the original flue gas of GGH, and the bypass flue gas enters a separately provided carbon monoxide catalyst reactor. The separately provided carbon monoxide catalyst reactor directly considers the steel structure and the flue duct, which wastes cost and is unstable in operation, and the inlet and outlet dampers need to be closed at any time. SUMMARY

[0004] In order to solve the problems of the prior art, the utility model aims to provide an energy -conserving flue gas decarburization denitration system, and the carbon monoxide catalyst installation position of the energy -conserving flue gas decarburization denitration system provided by the utility model is reasonable in arrangement, small in resistance, convenient to install and saves construction cost.

[0005] In order to achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] The first aspect of the utility model provides an energy -conserving flue gas decarburization denitration system, which comprises a carbon monoxide catalyst, a denitration reactor and a flue gas pipeline.

[0007] One end of the flue gas pipeline is communicated with the upstream of the denitration reactor, and the carbon monoxide catalyst is arranged in the flue gas pipeline upstream of the denitration reactor.

[0008] Optionally, the energy -conserving flue gas decarburization denitration system further comprises a flue gas heater connected with the flue gas pipeline.

[0009] Optionally, the flue gas heater is integrally connected with the flue gas pipeline.

[0010] Optionally, in the energy-saving flue gas decarburization and denitration system, the carbon monoxide catalyst is arranged in the flue gas pipeline upstream of the flue gas heater.

[0011] Optionally, in the energy-saving flue gas decarburization and denitration system, the carbon monoxide catalyst is arranged in the standby layer denitration catalyst position of the denitration reactor.

[0012] Optionally, the energy-saving flue gas decarburization and denitration system further comprises a flue gas heat exchanger, and the flue gas flows into the inside of the flue gas pipeline through the flue gas heat exchanger.

[0013] Optionally, in the energy-saving flue gas decarburization and denitration system, the denitration reactor comprises an inlet flue, a denitration catalyst and an outlet flue, and the denitration reactor is connected with the flue gas heat exchanger through the outlet flue.

[0014] Optionally, in the energy-saving flue gas decarburization and denitration system, the denitration catalyst in the denitration reactor is arranged in multiple groups, and each group of the denitration catalyst is distributed at intervals along the flue gas flow direction.

[0015] Optionally, in the energy-saving flue gas decarburization and denitration system, the carbon monoxide catalyst is arranged in the standby layer denitration catalyst position in the inlet flue of the denitration reactor.

[0016] Optionally, in the energy-saving flue gas decarburization and denitration system, the carbon monoxide catalyst is arranged in multiple groups, and each group of the carbon monoxide catalyst is distributed at intervals along the flue gas flow direction.

[0017] The energy-saving flue gas decarburization and denitration system has the following beneficial effects:

[0018] The energy-saving flue gas decarburization and denitration system provided by the utility model releases a large amount of heat to heat the flue gas temperature, reduces the heat supplement temperature of the flue gas heater, thereby reducing the consumption of blast furnace gas and saving operation energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0019] The description and drawings of the utility model constitute a part of the utility model and are used to provide further understanding on the utility model, the illustrative embodiment of the utility model and the description thereof are used to explain the utility model, and do not constitute improper limitation on the utility model.

[0020] Figure 1 The utility model discloses an energy -conserving flue gas decarburization denitration system's structure diagram.

[0021] Wherein, 1 - flue gas heat exchanger, 2 - carbon monoxide catalyst (first position), 3 - flue gas heater, 4 - flue gas pipeline, 5 - denitration reactor, 501 - inlet flue, 502 - denitration catalyst, 503 - outlet flue, 6 - carbon monoxide catalyst (second position) of spare layer denitration catalyst position. DETAILED DESCRIPTION

[0022] The utility model discloses an energy -conserving flue gas decarburization denitration system, improves carbon monoxide removal efficiency, utilizes carbon monoxide reaction heat release to reduce coal gas consumption and saves energy.

[0023] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the range of the utility model protection.

[0024] As Figure 1 The utility model discloses an energy -conserving flue gas decarburization denitration system, including carbon monoxide catalyst 2, denitration reactor 5 and flue gas pipeline 4. Wherein, flue gas pipeline 4 one end is communicated in the upstream of denitration reactor 5, and carbon monoxide catalyst 2 sets up in the flue gas pipeline 4 in the upstream of denitration reactor 5. After the flue gas enters flue gas pipeline 4, after carbon monoxide catalyst 2, the carbon monoxide in the flue gas reacts to generate carbon dioxide and releases a large amount of heat, that is, removes the carbon monoxide in the flue gas, and also releases a large amount of heat to heat the flue gas, ensures the temperature required for the normal operation of denitration reactor 5. When it is necessary to replace carbon monoxide catalyst 2, stop inputting the flue gas, can use denitration reactor to check hoist and overhaul, need not set up additional reactor or overhaul measure, reduces construction cost and overhaul cost.

[0025] It should be noted that the size of the carbon monoxide catalyst 2 can be set according to actual needs, so that the flue gas in the carbon monoxide catalyst has a suitable flow rate and can accommodate more catalysts, providing a better reaction environment for the removal of carbon monoxide from the flue gas, thereby improving the efficiency of carbon monoxide removal.

[0026] As Figure 1As shown, the energy-saving flue gas decarburization and denitration system further comprises a flue gas heater 3 (i.e. hot blast stove) connected with the flue gas pipeline 4. The flue gas entering the flue gas pipeline 4 is heated twice by the flue gas heater 3 and the carbon monoxide catalyst 2, and then flows into the denitration reactor 5 through the pipeline. The twice heating ensures the temperature required for the normal operation of the denitration reactor 5.

[0027] It should be noted that there is no control valve between the flue gas pipeline 4 and the flue gas heater 3, and the flue gas heater 3 is integrally connected with the flue gas pipeline 4. It can be understood that the flue gas heater 3 is a set of equipment that can be started and stopped. When the flue gas heater 3 is started, the flue gas is heated. If the heat released by the carbon monoxide catalytic reaction of the carbon monoxide catalyst 2 is high enough, the flue gas heater 3 is closed, and the gas consumption is saved.

[0028] At the same time, the carbon monoxide catalyst 2 provided in the embodiment is arranged in the flue gas pipeline 4 upstream of the flue gas heater 3, i.e. at the first position.

[0029] Of course, it can be understood that the carbon monoxide catalyst 2 can also be arranged at the standby layer denitration catalyst position of the denitration reactor 5, i.e. at the second position.

[0030] As shown in Figure 1 The energy-saving flue gas decarburization and denitration system further comprises a flue gas heat exchanger 1 (GGH, Gas Gas Heater). The flue gas flows into the inside of the flue gas pipeline 4 through the flue gas heat exchanger 1, and then flows into the denitration reactor 5 after the carbon monoxide is removed by the carbon monoxide catalyst 2.

[0031] As shown in Figure 1 The denitration reactor 5 comprises an inlet flue 501, a denitration catalyst 502 and an outlet flue 503. The denitration reactor 5 is connected with the flue gas heat exchanger 1 through the outlet flue 502.

[0032] In order to facilitate maintenance, the carbon monoxide catalyst 2 can also be arranged in the inlet flue 501 of the denitration reactor 5, at the uppermost standby layer denitration catalyst position. By being arranged at this position, the carbon monoxide catalyst 2 can be maintained by the lifting of the maintenance of the denitration reactor 5, without the need to arrange an additional reactor or maintenance measure.

[0033] Of course, it can be understood that the denitration catalyst 502 in the denitration reactor 5 is arranged in multiple groups, and each group of the denitration catalyst 502 is distributed along the flow direction of the flue gas. By arranging multiple groups of denitration catalyst 502, the denitration efficiency of the denitration reactor 5 can be significantly improved.

[0034] Similarly, the carbon monoxide catalyst 2 can also be arranged in multiple groups, and each group of the carbon monoxide catalyst 2 is distributed along the flow direction of the flue gas. By arranging multiple groups of carbon monoxide catalyst 2, the efficiency of removing carbon monoxide in the flue gas can be significantly improved.

[0035] In a specific embodiment, some Goupang Steel 180m 2 The sintering machine adopts the energy-saving flue gas decarburization and denitration system provided in the embodiment, the flue gas amount is 723000Nm 3 / h (standard state), the original flue gas carbon monoxide concentration is about 7000mg / Nm 3 The energy-saving flue gas decarburization and denitration system provided in the embodiment is used for flue gas treatment, and the carbon monoxide catalyst 2 is arranged in the uppermost standby layer denitration catalyst position in the inlet flue 501 of the denitration reactor 5, two layers of carbon monoxide catalysts 2 are installed, the carbon monoxide concentration in the treated flue gas is 2500mg / Nm 3 After the flue gas passes through the carbon monoxide catalyst, the flue gas temperature rises by 25℃, at this time, the flue gas temperature entering the denitration reactor 5 is 310℃. The combustion consumption of the flue gas heater 3 is reduced by 50%-60%.

[0036] The utility model provides a kind of energy-saving flue gas decarburization and denitration system, when the system operates, utilize carbon monoxide catalyst to catalyze the carbon monoxide reaction in flue gas to generate carbon dioxide, release a large amount of heat to heat flue gas temperature, reduce flue gas heater heat-up temperature, to reduce blast furnace gas consumption, save operating energy consumption, and stable operation.Carbon monoxide catalyst is installed in flue gas pipeline or denitration reactor, installation is convenient, save space, without new steel frame and reactor, carbon monoxide catalyst can utilize denitration reactor hoist to overhaul, without setting additional reactor or overhaul measure, save construction cost.

[0037] It should be noted that each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments.

[0038] The principle and implementation mode of the utility model are described by applying specific examples in this paper, and the above embodiment description is only applicable to help understand the core idea of the utility model. It should be pointed out that for ordinary skilled persons in the technical field, without departing from the principle of the utility model, some improvements and modifications can be made to the utility model, and these improvements and modifications also fall within the protection scope of the utility model claims.

Claims

1. An energy-saving flue gas decarburization and denitration system, characterized in that, The system comprises a carbon monoxide catalyst, a denitration reactor and a flue gas pipeline. One end of the flue gas pipeline is connected to the upstream of the denitration reactor, and the carbon monoxide catalyst is arranged in the flue gas pipeline upstream of the denitration reactor.

2. The energy-saving flue gas decarburization and denitration system according to claim 1, characterized in that, The energy-saving flue gas carbon monoxide removal and denitration system further comprises a flue gas heater connected to the flue gas pipeline.

3. The energy-saving flue gas decarburization and denitration system according to claim 2, characterized in that, The flue gas heater is integrally connected to the flue gas pipeline.

4. The energy-saving flue gas decarburization and denitration system according to claim 2, characterized in that, The carbon monoxide catalyst is arranged in the flue gas pipeline upstream of the flue gas heater.

5. The energy-saving flue gas decarburization and denitration system according to claim 2, characterized in that, The carbon monoxide catalyst is arranged in the standby layer of denitration catalyst of the denitration reactor.

6. The energy-saving flue gas decarburization and denitration system according to claim 1, characterized in that, The energy-saving flue gas carbon monoxide removal and denitration system further comprises a flue gas heat exchanger through which the flue gas flows into the flue gas pipeline.

7. The energy-saving flue gas decarburization and denitration system according to claim 6, characterized in that, The denitration reactor comprises an inlet flue, a denitration catalyst and an outlet flue; the denitration reactor is connected to the flue gas heat exchanger through the outlet flue.

8. The energy-saving flue gas decarburization and denitration system according to claim 7, characterized in that, The denitration catalyst in the denitration reactor is arranged in multiple groups, and each group of the denitration catalyst is distributed at intervals along the flue gas flow direction.

9. The energy-saving flue gas decarburization and denitration system according to claim 7, characterized in that, The carbon monoxide catalyst is arranged in the standby layer of denitration catalyst in the inlet flue of the denitration reactor.

10. The energy-saving flue gas decarburization and denitration system according to claim 1, 4, 5 or 9, characterized in that, The carbon monoxide catalyst is arranged in multiple groups, and each group of the carbon monoxide catalyst is distributed at intervals along the flue gas flow direction.

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