Waste heat power generation hot air circulation sintering oxygen-enriched ignition device

Abstract

The utility model discloses a waste heat power generation hot air circulation sintering oxygen-enriched ignition device, which belongs to the technical field of sintering devices in iron and steel plants and comprises a furnace body, an oxygen supply pipeline, a combustion-supporting air pipeline, a fuel pipeline and an air inducing component. An igniter and a sintering heat preservation cover are arranged in the furnace body, and the igniter is located above the sintering heat preservation cover. The oxygen supply pipeline, the combustion-supporting air pipeline and the fuel pipeline are all connected with the igniter, the input end of the air inducing assembly is connected with an exhaust port of the circular cooler waste heat power generation device, the output end of the air inducing assembly is connected with the combustion-supporting air pipeline, and hot air generated after circular cooler high-temperature section waste heat power generation is guided into the igniter through the combustion-supporting air pipeline. The oxygen-enriched hot air sintering device solves the problems that a traditional sintering device is high in fuel consumption, and the equipment cost is increased due to the fact that a dust remover needs to be arranged when hot air of a circular cooler is introduced into an existing oxygen-enriched hot air sintering device.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of sintering device of steel plant, especially to the oxygen-enriched ignition device of waste heat power generation hot air circulation sintering. BACKGROUND

[0002] In the sintering ignition process, although the use of blast furnace gas realizes the utilization of energy and the control of cost to some extent, its shortcomings are still obvious, the calorific value of blast furnace gas is low (3500kcal / m 3 ), which undoubtedly increases the required gas consumption in the ignition process (20-30m3 / t of iron-containing raw material). The low calorific value means that the heat released by unit volume of gas is limited, so in order to achieve the high-temperature condition required for sintering ignition, more blast furnace gas than other high-calorific-value fuels is usually consumed.

[0003] Chinese patent CN 117663799 A proposes an oxygen-enriched hot air sintering device, which includes a circular cooler, a dust removal module, an oxygen supply module, and a sintering machine. The dust removal module is in communication with the medium-temperature section of the circular cooler, the oxygen supply module is in communication with the air outlet pipe of the dust removal module, and the air outlet pipe of the dust removal module is also in communication with the hot air cover of the sintering machine. During operation, the exhaust gas of the medium-temperature section of the circular cooler is treated by dust removal and then mixed with oxygen and injected into the sintering machine. By recycling the heat of the exhaust gas discharged from the circular cooler, the consumption of fuel is reduced. However, the temperature of the exhaust gas of the medium-temperature section of the circular cooler is about 150-200℃, the dust particle size is relatively large, about 10-50μm, and the dust concentration is relatively high. Therefore, when recycling the heat of the exhaust gas, a dust collector must be provided, resulting in an increase in equipment cost.

[0004] The existing sinter circular cooler is generally provided with a waste heat power generation device. The temperature of the exhaust gas of the high-temperature section of the circular cooler is about 300-450℃, and after waste heat power generation, the temperature is about 150-200℃, the dust particle size is relatively small, generally within 10μm, and the dust concentration is relatively low. If the exhaust gas (hot air) after waste heat power generation of the high-temperature section of the circular cooler is recycled, a dust collector does not need to be provided, which is beneficial to reducing equipment cost. Based on this concept, the utility model proposes an oxygen-enriched ignition device of waste heat power generation hot air circulation sintering. UTILITY MODEL CONTENTS

[0005] The utility model proposes an oxygen-enriched ignition device of waste heat power generation hot air circulation sintering to solve the problem of high fuel consumption of traditional sintering devices and also solve the problem of increased equipment cost due to the need to provide a dust collector when the existing oxygen-enriched hot air sintering device uses the hot air of the circular cooler.

[0006] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of:

[0007] The waste heat power generation hot air circulation sintering oxygen-enriched ignition device comprises a furnace body, an oxygen supply pipeline, a combustion air pipeline, a fuel pipeline and an air induction assembly, the furnace body is internally provided with an igniter and a sintering heat preservation cover, the igniter is located above the sintering heat preservation cover, the oxygen supply pipeline, the combustion air pipeline and the fuel pipeline are all connected with the igniter, the input end of the air induction assembly is connected with the exhaust port of the ring cooler waste heat power generation device, and the output end is connected with the combustion air pipeline.

[0008] Further, the oxygen supply pipeline comprises an oxygen main pipe and sequentially arranged on the oxygen main pipe are a stop valve A, a diffusion valve, a stop valve B, a filter, a pressure reducing valve, a pneumatic regulating valve A, a flow meter and a pneumatic regulating valve B, and one end of the oxygen main pipe, away from the stop valve A, is connected with the combustion air pipeline.

[0009] Further, the combustion air pipeline comprises a combustion hot air pipe and a mixing pipe, one end of the combustion hot air pipe is connected with the output end of the air induction assembly, the other end is in communication with the mixing pipe, one end of the oxygen main pipe is in communication with the mixing pipe, and the other end is connected with an oxygen supply device, and the mixing pipe is connected with the igniter, so that oxygen and combustion hot air are mixed and then sent into the igniter.

[0010] Further, the oxygen main pipe is connected with the mixing pipe through a plurality of oxygen branch pipes, and each oxygen branch pipe is provided with a stop valve C.

[0011] Further, the oxygen main pipe is provided with a purge port, and the purge port is located between the pneumatic regulating valve B and the oxygen branch pipe.

[0012] Further, the combustion air pipeline further comprises a preheating pipe, the combustion hot air pipe is connected with the mixing pipe through the preheating pipe, the middle part of the preheating pipe is located in the sintering heat preservation cover, and the sintering heat preservation cover is connected with a plurality of ring cooling hot air introduction pipes.

[0013] Further, the flow meter is a orifice flow meter.

[0014] Further, the air induction assembly comprises an air induction fan, the air inlet of the air induction fan is connected with the exhaust port of the ring cooler waste heat power generation device through a hot air input pipe, and the air outlet of the air induction fan is connected with the combustion air pipeline through a hot air output pipe.

[0015] Due to the adoption of the above technical scheme, the waste heat power generation hot air circulation sintering oxygen-enriched ignition device has the following beneficial effects:

[0016] 1. The utility model discloses a can effectively utilize the circulating hot air after the waste heat power generation of ring cooling machine, improve the ignition gas temperature, and the mixed gas of oxygen and air is passed into the igniter, the oxygen content of the combustion air in the igniter is raised, the combustion temperature of low calorific value gas can be effectively improved, the ignition effect of sintering material surface is strengthened, normal ignition operation can be realized under the condition of no preheating furnace, the sintering process reaction is more thorough, thereby the ignition gas consumption is reduced.

[0017] 2. The utility model discloses directly quote the hot air after the waste heat power generation of ring cooling machine high temperature section, because the hot air after the waste heat power generation of ring cooling machine high temperature section has the characteristics that the dust particle size is small, the concentration is low, can directly introduce the igniter, need not to install dust catcher additionally, saves the equipment cost.

[0018] 3. The utility model discloses the oxygen supply pipeline is provided with stop valve, filter, pressure reducing valve, pneumatic control valve, flowmeter etc., can monitor, adjust oxygen flow, for the igniter even, stablely transport combustion-supporting gas, realize effective hot air oxygen-enriched ignition, thereby improve the combustion temperature of low calorific value gas. Through control oxygen pressure, flow, make the oxygen content in combustion-supporting wind stable, adjust gas flow to make sintering ignition temperature stable in normal production demand temperature range, adjust combustion-supporting wind flow to make the air-fuel ratio reach optimal, ensure gas combustion, thereby reach both guarantee the sintering production ignition temperature and intensity, reach the purpose of saving gas usage. Not only improve product quality pass rate, reduce manual operation, save manpower, still more convenient, safe and reliable.

[0019] 4. The utility model discloses combustion-supporting wind pipeline includes combustion-supporting hot air pipe, mixing pipe and preheating pipe, wherein, preheating pipe extends to sintering heat preservation cover, and sintering heat preservation cover is connected with a plurality of ring cooling hot air introduction pipe, and ring cooling hot air introduction pipe leads the hot air of ring cooling machine hot air section, further recycles and utilizes the waste heat of ring cooling machine. When working, the hot air that combustion-supporting hot air pipe transports is transported to the igniter after secondary heating of preheating pipe, can further improve the temperature of hot air. ACCURACY

[0020] Fig. 1 It is the structure schematic drawing of the igniter of the utility model;

[0021] Fig. 2 It is the ignition process plan view of the utility model;

[0022] Fig. 3 It is the oxygen supply pipeline arrangement schematic drawing of the utility model;

[0023] The components in the attached diagram are labeled as follows: 1-furnace body, 2-oxygen supply pipeline, 3-combustion air pipeline, 4-fuel pipeline, 5-igniter, 6-sintering insulation cover, 7-combustion hot air pipe, 8-mixing pipe, 9-preheating pipe, 10-induced draft assembly, 11-hot air input pipe, 12-hot air output pipe, 13-oxygen main pipe, 14-stop valve A, 15-vent valve, 16-stop valve B, 17-filter, 18-pressure reducing valve, 19-pneumatic regulating valve A, 20-flow meter, 21-pneumatic regulating valve B, 22-purge port, 23-oxygen branch pipe, 24-stop valve C, 25-vent pipe, 26-annular cooler, 27-annular cooler hot air inlet pipe. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1

[0026] like Figs. 1-3 As shown, this utility model proposes a waste heat power generation hot air circulation sintering oxygen-enriched ignition device, which includes a furnace body 1, an oxygen supply pipeline 2, a combustion air pipeline 3, a fuel pipeline 4, and an induced draft assembly 10. An igniter 5 and a sintering insulation cover 6 are installed inside the furnace body 1. The igniter 5 is located above the sintering insulation cover 6. The oxygen supply pipeline 2, the combustion air pipeline 3, and the fuel pipeline 4 are all connected to the igniter 5. The input end of the induced draft assembly 10 is connected to the exhaust port of the waste heat power generation device of the annular cooler, and the output end is connected to the combustion air pipeline 3, introducing the hot air generated by the waste heat power generation in the high-temperature section of the annular cooler 26 into the igniter 5 through the combustion air pipeline 3.

[0027] This utility model directly utilizes the hot air generated by the waste heat power generation in the high-temperature section of the annular cooler 26. Since the hot air generated by the waste heat power generation in the high-temperature section of the annular cooler 26 has the characteristics of small dust particle size and low concentration, it can be directly introduced into the igniter 5 without the need to install a separate dust collector, thus saving equipment costs.

[0028] This invention injects hot air into the igniter 5 as a high-temperature combustion-supporting air, which can increase the heat of the combustion-supporting air. However, because the temperature of the combustion-supporting air is high, its oxygen content is 20.5% lower than that of normal atmosphere, only about 13-16%. Therefore, supplementing oxygen will increase the oxygen content of the combustion-supporting air to 23-25%.

[0029] The oxygen supply pipeline 2 comprises an oxygen main pipe 13, a cut-off valve A 14, a diffusion valve 15, a cut-off valve B 16, a filter 17, a pressure reducing valve 18, a pneumatic regulating valve A 19, a flow meter 20 and a pneumatic regulating valve B 21 arranged in sequence on the oxygen main pipe 13, and the end of the oxygen main pipe 13 away from the cut-off valve A 14 is connected with the combustion-supporting air pipeline 3.

[0030] The filter 17 can filter the impurities in the oxygen main pipe 13, so that the impurities are prevented from entering the igniter and causing the igniter to be blocked. The cut-off valve A 14 can cut off the connection between the oxygen main pipe 13 and an oxygen supply device (for example, an oxygen pipe), and the diffusion valve 15 is used for pipeline gas purging and replacement when the oxygen pipeline is not used, so as to ensure the safety of the pipeline.

[0031] The oxygen supply pipeline 2 of the utility model is provided with a cut-off valve, a filter 17, a pressure reducing valve 18, a pneumatic regulating valve, a flow meter 20 and the like, can monitor and regulate the oxygen flow, uniformly and stably transports the combustion-supporting gas to the igniter 5, realizes effective hot-air oxygen-rich ignition, and thus improves the combustion temperature of the low-calorific-value coal gas.

[0032] The combustion-supporting air pipeline 3 comprises a combustion-supporting hot-air pipe 7, a mixing pipe 8 and a preheating pipe 9, one end of the combustion-supporting hot-air pipe 7 is connected with the output end of an air induction assembly 10, the other end is connected with the mixing pipe 8 through the preheating pipe 9, the middle part of the preheating pipe 9 is located in a sintering heat preservation cover 6, and the sintering heat preservation cover 6 is connected with a plurality of ring cooling hot-air guide pipes 27.

[0033] The combustion-supporting air transported by the combustion-supporting hot-air pipe 7 is preheated through the preheating pipe 9 and then is transported to the igniter 5 through the mixing pipe 8, so that the temperature of the hot air can be further improved.

[0034] Specifically, the oxygen main pipe 13 is connected with the mixing pipe 8 through several oxygen branch pipes 23, and each oxygen branch pipe 23 is provided with a stop valve C24. In the embodiment, the number of the oxygen branch pipes 23 and the stop valves C24 is three. The oxygen main pipe 13 is provided with a pressure reducing valve, which can adjust the oxygen pressure of the oxygen branch pipe 23 in real time according to the pressure change of the oxygen main pipe 13, so as to ensure the stability of the oxygen flow. In addition, the oxygen main pipe 13 is provided with a purge port 22, which is located between the pneumatic regulating valve B21 and the oxygen branch pipe 23. The function of the purge port 22 is to replace the gas in the pipeline for pipeline maintenance.

[0035] The air induction assembly 10 comprises an air induction fan, an air inlet of the air induction fan is connected with an exhaust port of the waste heat power generation device of the annular cooler through the hot air input pipe 11, and an air outlet of the air induction fan is connected with the combustion-supporting air duct 3 through the hot air output pipe 12, specifically connected with the combustion-supporting hot air pipe 7 of the combustion-supporting air duct 3.

[0036] The ignition device provided by the utility model has the advantages of simple structure, convenient operation, high safety and high reliability.

[0037] First step: start the air induction fan, and introduce the hot air after waste heat power generation of the high-temperature section of the annular cooler 26 into the combustion-supporting hot air pipe 7.

[0038] Second step: close the pneumatic regulating valve A19 and the pneumatic regulating valve B21, the stop valve C24 and the diffuser valve 15, and sequentially open the stop valve A14 and the stop valve B16.

[0039] Third step: sequentially open the pneumatic regulating valve A19 and the pneumatic regulating valve B21, and the stop valve C24, and inject oxygen into the mixing pipe 8, and adjust the flow to an appropriate value.

[0040] Fourth step: observe the change of the length of the flame of the igniter, detect the content of the combustion-supporting air O2 at the end of the mixing pipe 8, and control the O2 at 23%-25%.

[0041] The utility model discloses can effectively utilize the circular cooler 26 after the circulating hot air of waste heat power generation, improve the ignition gas temperature, and the mixed gas of oxygen and air is passed into the igniter 5, the oxygen content of the combustion air in the igniter 5 is raised, the combustion temperature of low calorific value coal gas can be effectively improved, the ignition effect of sintering material surface is strengthened, the sintering process reaction is more thorough, thereby reducing the ignition coal gas consumption. In the sintering process, the high temperature and combustion product obtained by burning solid fuel such as coke powder or anthracite powder provide the required heat and atmosphere conditions for liquid phase generation and all physical and chemical reactions. Under the condition of relatively high oxygen level, the heat and mass transfer conditions of gas phase, solid phase and liquid phase are better, which is beneficial to liquid phase generation. At the same time, the reaction is more complete, and the combustion conditions of coke powder are also improved, achieving the effect of full oxidation of low-price iron oxide, and ensuring the necessary conditions for the generation of more calcium ferrite. Therefore, whether from the uniform distribution of sinter grain size or the optimization of chemical composition, oxygen-enriched sintering can improve the quality of sinter and reduce the amount of CO generated in the ignition process.

[0042] The utility model discloses utilize circular cooler 26 high temperature section hot air to the ignition heat and promote, add oxygen in combustion air duct 3 and promote high temperature hot air oxygen content, increase ignition temperature and sintering material surface radiant heat and ignition section part 1000 DEG C or so surplus heat preheat combustion air, thereby solve the normal ignition operation under the condition of no preheating furnace, reduce gas consumption and equipment maintenance quantity, improve safety performance.

[0043] The utility model discloses overcome the current no coke oven gas condition, blast furnace gas heat value low and unstable, engineering construction land area is small, natural gas is expensive and causes production cost higher external uncontrollable factor, provide a kind of low fuel consumption blast furnace gas ignition device, from combustion air preheating, gas efficient ignition, heat preservation measure, circular cooling waste gas waste heat recycling etc., on the one hand, reduce blast furnace gas gas consumption, ton ore gas consumption reaches the national leading level;On the other hand, effectively utilize blast furnace gas, safely and effectively complete ignition operation, reduce labour intensity, effectively improve sintering material surface strength.

[0044] The above description is directed to the detailed description of the preferred feasible embodiment of the utility model, but the embodiment is not used to limit the patent application range of the utility model, and any equivalent change or modification change completed under the technical spirit suggested by the utility model should belong to the patent range covered by the utility model.

Claims

1. A waste heat power generation hot air circulation sintering oxygen-enriched ignition device, comprising a furnace body, an oxygen supply pipeline, a combustion air pipeline, a fuel pipeline and an air induction assembly, a igniter and a sintering heat preservation cover are arranged in the furnace body, the igniter is located above the sintering heat preservation cover, characterized in that: The oxygen supply pipeline, combustion air pipeline and fuel pipeline are connected with the igniter, the input end of the air induction assembly is connected with the exhaust port of the ring cooler waste heat power generation device, and the output end is connected with the combustion air pipeline.

2. The waste heat power generation hot air cycle sintering oxygen-enriched ignition device according to claim 1, characterized in that: The oxygen supply pipeline includes an oxygen main pipe and a cut-off valve A, a diffusion valve, a cut-off valve B, a filter, a pressure reducing valve, a pneumatic regulating valve A, a flow meter and a pneumatic regulating valve B arranged on the oxygen main pipe in sequence.

3. The waste heat power generation hot air cycle sintering oxygen-enriched ignition device according to claim 2, characterized in that: The combustion air pipeline includes a combustion hot air pipe and a mixing pipe, one end of the combustion hot air pipe is connected with the output end of the air induction assembly, the other end is communicated with the mixing pipe, one end of the oxygen main pipe is communicated with the mixing pipe, and the other end is connected with an oxygen supply device.

4. The waste heat power generation hot air cycle sintering oxygen-enriched ignition device according to claim 3, characterized in that: The oxygen main pipe is connected with the mixing pipe through a plurality of oxygen branch pipes, and each oxygen branch pipe is provided with a cut-off valve C.

5. The waste heat power generation hot air cycle sintering oxygen-enriched ignition device according to claim 4, characterized in that: The oxygen main pipe is provided with a purge port, and the purge port is located between the pneumatic regulating valve B and the oxygen branch pipe.

6. The waste heat power generation hot air cycle sintering oxygen-enriched ignition device according to claim 5, characterized in that: The combustion air pipeline further includes a preheating pipe, the combustion hot air pipe is connected with the mixing pipe through the preheating pipe, the middle part of the preheating pipe is located in a sintering heat preservation cover, and the sintering heat preservation cover is connected with a plurality of ring cooling hot air introduction pipes.

7. The waste heat power generation hot air cycle sintering oxygen-enriched ignition device according to claim 2, characterized in that: The flow meter is a orifice flow meter.

8. The waste heat power generation hot-air cycle sintering oxygen-enriched ignition device according to claim 1, characterized in that: The air induction assembly includes an air induction fan, the air inlet of the air induction fan is connected with the exhaust port of the ring cooler waste heat power generation device through a hot air input pipe, and the air outlet of the air induction fan is connected with the combustion air pipeline through a hot air output pipe.

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