CN213335574U

CN213335574U - Air channeling preventing system for preheating section of chain grate machine

Info

Publication number: CN213335574U
Application number: CN202021273391.1U
Authority: CN
Inventors: 胡兵; 曾辉; 刘臣; 魏进超
Original assignee: Zhongye Changtian International Engineering Co Ltd
Current assignee: Zhongye Changtian International Engineering Co Ltd
Priority date: 2020-07-01
Filing date: 2020-07-01
Publication date: 2021-06-01
Anticipated expiration: 2030-07-01

Abstract

The utility model discloses a grate preheating section air blowby preventing system, this system include grate and rotary kiln. The chain grate machine is sequentially provided with a blast drying section, an air draft drying section, a preheating section and a preheating section. The preheating section is communicated with a smoke outlet of the rotary kiln through a first pipeline. And an anti-air-channeling device is arranged between the preheating first section and the preheating second section. The utility model discloses an add movable air current balance plate between chain grate machine PH section and TPH section, utilize the air current balance plate position to change the atmospheric pressure of the atmospheric pressure more than or equal to PH section that controls the TPH section, prevent that the high NOx waste gas of PH section from scurrying the problem that NOx content rised in the wind leads to TPH section flue gas to the TPH section. And the ultralow NOx emission is realized through the accurate regulation and control of the wind flow control method.

Description

Air channeling preventing system for preheating section of chain grate machine

Technical Field

The utility model relates to a grate machine prevents scurrying wind system, concretely relates to grate machine preheats section and prevents scurrying wind system belongs to grate machine flue gas processing technology field.

Background

NOx is a main reason for forming photochemical smog, acid rain and dust haze weather, aggravating ozone layer damage and promoting greenhouse effect, and has great harm to the ecological environment. The ecological environment department of 2019 issues 'comments on ultra-low emission in the promotion and implementation of the steel industry', and the pellet roasting smoke is definitely required to have the hourly mean emission concentration of NOx not higher than 50mg/m under the condition that the reference oxygen content is 18%³. If the oxygen content is higher than 18%, the NOx concentration is evaluated as a value converted to the reference oxygen content. Therefore, the method is an effective technical measure to meet the emission requirements of atmospheric pollutants in steel sintering and pellet industries and simultaneously reduce the concentration of NOx and the concentration of oxygen in roasting flue gas. From the production conditions of most pelletizing plants, the NOx emission concentration is generally 100-300 mg/m³And the oxygen content in the waste gas is 17-19 percent.

The NOx generation in the pellet production process mainly comes from two forms of fuel type and thermal type, and although the NOx generation amount in the grate-kiln pellet production process can be reduced by reducing the pellet yield, namely reducing the coal gas or coal powder injection amount, reducing the pellet strength requirement, namely reducing the rotary kiln temperature, and adopting measures of raw materials and fuels with lower NOx and the like, the NOx generation amount is difficult to meet the environment-friendly requirement of ultralow emission.

In the prior art, due to the fact that no systematic research and reliable technology for generating and controlling low NOx in the pellet production process of the chain grate machine-rotary kiln exist, NOx emission in the production process of a pellet factory does not reach the standard and becomes a normal state, and the method is one of the biggest challenges facing enterprises. Therefore, enterprises can only reduce the output of the pellets, thereby reducing the injection amount of coal gas or coal powder, reducing the strength requirement of the pellets, reducing the temperature of the rotary kiln, and reducing the generation of NOx by adopting lower NOx raw materials and fuels and the like. These methods not only affect pellet production in terms of yield and quality, have high quality requirements on raw fuels, cause cost increase, but also cannot fundamentally solve the problem of low-NOx pellet production.

Currently, the preferred NOx removal technologies rely primarily on Selective Catalytic Reduction (SCR) and selective non-catalytic reduction (SNCR) techniques to remove NOx at the end and in the process, respectively. For SNCR denitration techniques, a temperature range of 800 ℃ to 1100 ℃ is generally considered to be suitable. In the production process of the grate-rotary kiln pellets, an SNCR denitration technology is applied, and the flue gas denitration is usually carried out by spraying a reducing agent (ammonia water or urea) into the flue gas at a preheating section (the temperature is 850-1100 ℃). The SNCR technology is connected with the SCR technology in series and is an effective means for realizing ultralow emission of pellet flue gas. In the face of strong environment-friendly air pressure, a production system for ultralow NOx emission of pellet smoke is provided (201821480691.X), and the ultralow NOx emission in the production process of the chain grate-rotary kiln pellets can be realized through the effective combination of an SNCR + SCR double denitration mechanism. However, the problem of air cross-ventilation caused by the difference between the temperature and the air pressure between the PH section and the TPH section in the production system of the chain grate machine is often solved, namely, the high NOx waste gas in the PH section is cross-ventilated to the TPH section, so that the NOx content in the smoke gas in the TPH section is increased. And then difficult to realize accurate control of denitration and the discharge to reach standard of NOx.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to prior art, the utility model provides a wind system is prevented scurrying by chain grate machine preheating section through add movable air current balance plate between chain grate machine PH section and TPH section, utilizes the atmospheric pressure of the atmospheric pressure more than or equal to PH section that air current balance plate position change controlled the TPH section, and then prevents that the high NOx waste gas of PH section from scurrying the wind to the TPH section for the problem that NOx content risees in the TPH section flue gas. The airflow balance plate is opened before the airflow of the grate air-channeling prevention system is unbalanced, and the airflow is closed in time after being stabilized, so that the grate system is positively influenced: namely, the SNCR + SCR denitration treatment is carried out on the PH section waste gas (about 1/3) to meet the requirement of ultralow emission of pellet NOx, and the investment and operation cost are greatly reduced. Meanwhile, the air flow balance plate is controlled to move towards the TPH end, so that the TPH section is indirectly selectively merged into the PH section by an air box close to the PH section, the high-temperature preheating time of the pellets is prolonged, and the effect of improving the strength of the preheated pellets is achieved.

In order to achieve the above object, the utility model discloses the technical scheme who adopts specifically as follows:

according to the utility model discloses a first embodiment provides a grate preheating section prevents scurrying wind system, and this system includes grate and rotary kiln. According to the trend of the materials, the chain grate machine is sequentially provided with a blast drying section, an air draft drying section, a preheating section and a preheating section. The preheating section is communicated with a smoke outlet of the rotary kiln through a first pipeline. And an anti-air-channeling device is arranged between the preheating first section and the preheating second section.

Preferably, the anti-blow-by device comprises an airflow balance plate, a moving platform, rollers and a slot. The airflow balance plate is arranged inside the chain grate machine. The mobile platform is arranged on two sides of the lower end of the outer part of the preheating section I and the preheating section II. The roller is arranged at the bottom of the mobile platform. The slots are arranged on two sides of the upper end of the outer part of the preheating section and the preheating section. The mobile platform is also provided with a fixed seat. The fixing seat is provided with an upright post. The top end of the upright post is connected with the top end of the airflow balance plate after passing through the slot. And a moving motor is also arranged outside the moving platform. The moving motor drives the moving platform to move on the roller. The moving platform drives the fixed seat and the upright post to move so as to drive the airflow balance plate to move in the chain grate machine.

Preferably, the air flow balance plate is composed of an outer plate and an inner plate. The outer plate is a plate body with a hollow inner part. The inner plate is sleeved in the inner cavity of the outer plate. The inner plate is also connected with a lifting motor. The lifting motor controls the inner plate to move in the vertical direction of the inner cavity of the outer plate.

Preferably, the system also comprises an ammonia agent denitration device. The ammonia agent denitration device is arranged in the preheating section and/or the first pipeline.

Preferably, the ammonia agent denitration device comprises a first sprayer, a second sprayer and an ammonia agent storage tank. The first sprayer is disposed within the preheating section. The second sprinkler is disposed within the first conduit. The ammonia agent storage tank is connected with the first sprayer through a second pipeline. A third pipeline is branched from the second pipeline and is connected with a second sprayer.

Preferably, the system also comprises an SCR denitration device and a dust removal device. And the air outlet of the preheating second section is communicated to the air inlet of the air draft drying section through a fourth pipeline. And an air outlet of the air draft drying section is communicated to a chimney through a fifth pipeline. The SCR denitration device is arranged on the fourth pipeline. The dust removal device is arranged on the fifth pipeline.

Preferably, the system further comprises a circulation cooler. The ring cooling machine is sequentially provided with a ring cooling first section, a ring cooling second section and a ring cooling third section. And an air outlet of the annular cooling section is communicated to an air inlet of the rotary kiln through a sixth pipeline. And the air outlet of the annular cooling second section is communicated to the air inlet of the preheating first section through a seventh pipeline. And the air outlet of the annular cooling three sections is communicated to the air inlet of the blast drying section through an eighth pipeline. And the air outlet of the preheating section is communicated to a fifth pipeline through a ninth pipeline. And an air outlet of the blowing and drying section is communicated to a chimney through a tenth pipeline.

Preferably, the system further comprises a first pressure detector, a second pressure detector, a first temperature detector, a second temperature detector, a first flow detector, a second flow detector and a flue gas analyzer. The first pressure detector, the first temperature detector and the flue gas analyzer are arranged in the preheating section. The second pressure detector and the second temperature detector are arranged in the preheating two-stage section. The first flow rate detector is arranged on the seventh pipeline. The second flow rate detector is arranged on the first pipeline.

According to a second embodiment of the present invention, there is provided a method for controlling air flow using the anti-blow-by system of the preheating section of the grate machine of the first embodiment, the method comprising the steps of:

1) according to the trend of the materials, the green pellets enter a chain grate machine, sequentially pass through a blast drying section, an air draft drying section, a preheating section and a preheating section, and are conveyed into a rotary kiln for oxidizing roasting. And conveying the oxidized pellets after the oxidizing roasting to a circular cooler for cooling.

2) According to the flow direction of the hot air, the hot air discharged from the ring cooling section is conveyed into the rotary kiln through a sixth pipeline and then conveyed into the preheating section through the first pipeline. And hot air exhausted from the annular cooling section is conveyed into the preheating section through a seventh pipeline.

3) And adjusting the horizontal position of an airflow balance plate arranged between the preheating first section and the preheating second section to ensure that the pressure in the preheating first section is greater than or equal to the pressure in the preheating second section.

4) The hot air in the preheating section is finally discharged through a ninth pipeline. The hot air in the preheating section is finally discharged through a fourth pipeline.

In the prior art, the NOx emission in the production process of a pellet mill does not reach the standard and becomes the normal state due to the fact that no systematic research and reliable technology for generating and controlling low NOx in the production process of the grate-rotary kiln pellets exist, and the method is one of the biggest challenges faced by enterprises. Therefore, enterprises can only reduce the output of the pellets, thereby reducing the injection amount of coal gas or coal powder, reducing the strength requirement of the pellets, reducing the temperature of the rotary kiln, and reducing the generation of NOx by adopting lower NOx raw materials and fuels and the like. These methods not only affect pellet production in terms of yield and quality, have high quality requirements on raw fuels, cause cost increase, but also cannot fundamentally solve the problem of low-NOx pellet production. In addition, through add denitrification facility behind main air exhauster, if adopt selective catalytic reduction technology (SCR) and non-selective catalytic reduction technology (SNCR), although can reach the requirement of low NOx emission, nevertheless because its investment cost is high, the equipment requirement is high, the energy consumption is big, denitration cost is high and there is secondary pollution, does not get popularization and application in the pelletizing enterprise, and the NOx control mode of pellet factory at home and abroad is mainly still realized through process control at present.

In the existing production process of pellet by chain grate machine-rotary kiln, the chain grate machine is divided into an air blowing drying section, an air draft drying section, a preheating section and a preheating section, and the ring cooling machine is divided into a ring cooling section, a ring cooling section and a ring cooling section. Wherein, the air of the first section of the circular cooling directly enters a rotary kiln to roast pellets, the pellets are preheated by the second section of the preheating, heated and then blown into an air draft drying section to carry out air draft drying on the pellets, and then the pellets are discharged outside by the air draft drying section (the pellets are subjected to flue gas purification treatment before being discharged); the air in the annular cooling second section enters the preheating first section to heat the preheating ball and then is discharged outwards; and air of the ring cooling three sections enters an air blowing and drying section to perform air blowing and drying on the green pellets, so that closed circulation of the grate-rotary kiln-ring cooler air flow system is realized. And simultaneously, a selective non-catalytic reduction technology (SNCR) is connected with a selective catalytic reduction technology (SCR) in series, and NOx is removed in the process (in the preheating section) and at the tail end (after the preheating section exhaust port). For example, the production system (201821480691.X) with ultralow NOx emission in pellet smoke can realize ultralow NOx emission in the production process of chain grate-rotary kiln pellets by effectively combining an SNCR + SCR double denitration mechanism. However, the problem of air channeling caused by the difference between the temperature and the air pressure of the PH section and the TPH section in the grate production system is often solved, namely, the high NOx waste gas in the PH section is mixed with the air in the TPH section, so that the NOx content in the flue gas in the TPH section is increased. And then difficult to realize accurate control of denitration and the discharge to reach standard of NOx.

The utility model discloses in, because of the temperature, the cross wind problem that atmospheric pressure difference leads to is implemented to denitration accurate control and NOx emission up to standard in PH section and TPH section in the production system that the ultralow NOx of solution pelletizing flue gas discharged, the utility model discloses add movable air current balance plate between chain grate machine PH section and TPH section, utilize the atmospheric pressure P2 of atmospheric pressure P1 more than or equal to PH section that the balance plate position change comes the main control TPH section, P1 is more than or equal to P2 promptly, prevents that the high NOx waste gas of PH section from crossing wind to TPH section for NOx content risees in the TPH section flue gas. Open the air current balance plate before chain grate air current system is unbalanced, in time close after stable, produce positive influence to chain grate system: the ultra-low emission requirement of pellet NOx can be met only by carrying out SNCR + SCR denitration treatment on PH section waste gas (about 1/3), and the investment and operation cost is greatly reduced; a plurality of bellows (generally 1-5, can carry out reasonable regulation setting according to operating condition) that are close to the PH section with TPH section merge PH section of selectivity, have prolonged the pelletizing high temperature preheating time indirectly, play the effect that improves and preheat ball intensity.

The utility model discloses in, through be provided with first pressure detection meter real-time detection in preheating one section and preheat atmospheric pressure in one section and be p1, Pa. And a second pressure detector is arranged in the preheating second section and used for detecting the air pressure in the preheating second section to be p2 Pa in real time. The detected p1 and p2 values are compared. If the detected p1 is more than or equal to p2, the system is not adjusted (the position of the airflow balance plate is kept unchanged); if the detected p1 is less than p2, the position movement of the airflow balance plate is controlled and adjusted, so that the p1 is more than or equal to the p 2. So as to prevent the high NOx waste gas in the PH section from blowing to the TPH section.

The utility model discloses in, prevent scurrying wind device includes air current balance plate, moving platform, running roller and fluting. The airflow balance plate is arranged inside the chain grate machine. The mobile platform is arranged on two sides of the lower end of the outer part of the preheating section I and the preheating section II. The roller is arranged at the bottom of the mobile platform. The slots are arranged on two sides of the upper end of the outer part of the preheating section and the preheating section. The mobile platform is also provided with a fixed seat. The fixing seat is provided with an upright post. The top end of the upright post penetrates through the open groove and then is connected with the top end of the airflow balance plate (the top end of the upright post penetrates through the open groove and then is connected with the top end of the airflow balance plate after being transversely bent). And a moving motor is also arranged outside the moving platform. The moving motor drives the moving platform to move on the roller. The moving platform drives the fixed seat and the upright post to move so as to drive the airflow balance plate to move in the chain grate machine (from the PH section to the TPH section).

Further, the air flow balance plate is composed of an outer plate and an inner plate. The outer plate is a plate body with a hollow inner part. The inner plate is sleeved in the inner cavity of the outer plate. The inner plate is also connected with a lifting motor. The lifting motor controls the inner plate to move in the vertical direction of the inner cavity of the outer plate. According to actual need, adjust the removal of inner panel, and then change the whole height of air current balance plate in order to satisfy the operating mode demand of co-altitude, prevent the emergence of scurrying the wind phenomenon.

In the present invention, the thickness of the inner plate is 1 to 20cm, preferably 2 to 15cm, and more preferably 3 to 10 cm. The thickness of the outer plate (i.e. the overall thickness of the airflow balancing plate) is 3-25cm, preferably 5-20cm, more preferably 8-15 cm. The thickness of the inner cavity of the outer plate is larger than that of the inner plate (for example, the thickness of the inner cavity of the outer plate is larger than that of the inner plate by 0.5cm, 1cm, 1.5cm, 2cm and the like, and can be selected according to the actual working condition requirement).

The utility model discloses in, it is c1, K to preheat the gas temperature in one section through being provided with first temperature detector real-time detection in preheating one section. And a second temperature detector is arranged in the preheating second section and used for detecting the temperature of the gas in the preheating second section as c2 and K in real time. The seventh pipeline is also provided with a first flow detector for detecting the flow rate of the gas delivered into the preheating section as q1 and Nm in real time³H is used as the reference value. The first pipeline is provided with a second flow detector for detecting the flow of the gas delivered into the preheating second section in real time as q2 Nm³H is used as the reference value. The mass of gas delivered to the preheat stage per unit time can be calculated as m1, g:

formula I, wherein m1 is ρ q1

Further, the mass of gas delivered to the preheating section per unit time is m2, g:

formula II, wherein m2 is ρ q2

In formula I and formula II, ρ is the gas average density, g/m³. t is the gas delivery time, h.

From the ideal gas state equation (pV ═ nRT ═ mRT/M), one can obtain:

formula III, p1 × v1 ═ ρ × q1 × t × R × c1/m

p2 v2 ═ p q2 ═ R · c2/m

In formulas III and IV, v1 is the volume of the preheating section, m³. v2 is the volume of the two preheating stages, m³. R is a gas constant, J/(mol. K). M is the average molar mass of the gas, g/mol.

Preferably, the length of the preheating section is a1, the width is b1, and the height is h1, which are all m units. The length of the preheating section is a2, the width is b2, and the height is h2, which are m. Then:

v1 ═ k1 a1 ═ b1 · h1.

v2 ═ k2 a2 ═ b2 · h2.

In formulas V and VI, k1 is the volume correction ratio for the preheat section. k2 is the volume correction ratio for the preheat section.

The utility model discloses in, when preheating one section or preheating the inner chamber configuration of two-section for the regular cuboid: k 1-k 2-1. When the lumen of the preheating section or the preheating section is shaped as an irregular rectangular body, in order to correct the error value of the volume calculation formula (length × width × height), correction values k1 and k2 are introduced so that the calculated volume is closest to the actual volume. Generally, the values of k1 and k2 are a fixed constant for the same chain grate.

Further, substituting formula V into formula III yields:

formula VII is formula VII p1 ═ q1 ═ t × R c1/(M × k1 · a1 × b1 × h1)

Further, substituting formula VI into formula IV yields:

formula VII is formula VII p2 ═ q2 ═ t × R c2/(M × k2 · a2 × b2 × h2)

When p1 is less than p2, the airflow balance plate (the initial position of the airflow balance plate is the boundary of the preheating section and the preheating section) needs to be moved to ensure that p1 is more than or equal to p2, and the horizontal movement amount of the airflow balance plate towards the preheating section is set to be delta a, m. Then:

formula VIII [ VIII ] formula (VIII) p1/p2 ═ q1 ═ c1 × (k 2: (a2- Δ a) × b2 × h2]/[ q2 × c2 × k1 (a1 +. Δ a) × b1 × h1]

When Z is equal to 1 (i.e. p1 is equal to p2), the minimum amount Δ a of movement of the air balance plate is equal to the minimum amount Δ a of movement_minComprises the following steps:

the horizontal movement quantity delta a of the airflow balance plate is adjusted to be larger than or equal to the calculated value delta a of the formula IX_minM, such that Z is ≧ 1, i.e., p1 ≧ p 2.

The utility model discloses in, adjust for the substep is adjusted when airflow balance plate horizontal displacement is delta a, and the adjustment number of times is established to N, then:

n ═ p2-p1)/(0.05 × p1

When the required horizontal displacement of the airflow balance plate is delta a, the moving times of the airflow balance plate are the calculated value N of the formula X.

It should be noted that the calculated Δ a cannot be simply and roughly adjusted in place, but needs to be adjusted slowly, and the change of the real-time parameters is continuously detected during the adjustment process and corrected in time, so as to avoid the influence of violent production fluctuation caused by too large adjustment stride on the production quality index. Here, the adjustment step size needs to be set: l ═ Δ a/N (in general, Δ a is taken as Δ a)_min) The adjustment was performed N times, where N is (p2-p1)/(0.05 × p1), and N is rounded. Further, the determination of N is a preferred calculation method, but not limited to this method, and in principle, the determination of N value needs to be based on the adjustment urgency (the more p1 is less than p2, the less the adjustment times should be, because the pressure difference should be reduced as soon as possible). However, after each step size adjustment, a new pressure detection is needed, and the process is continued if the target (p1 ≧ p2) is not reached. If the target is reached, the adjustment is stopped.

Further, a flue gas analyzer is arranged in the preheating section for detecting the content of NOx in the preheating section in real time to be less than or equal to 40mg/m³. Or the final emission concentration of NOx is lower than 50mg/m according to the national ultra-low emission standard³And (4) finishing.

Compared with the prior art, the utility model discloses following beneficial technological effect has:

1. the system utilizes the atmospheric pressure of the atmospheric pressure more than or equal to PH section that the balance plate position change comes the main control TPH section through addding movable air current balance plate between chain grate machine PH section and TPH section, prevents that the high NOx waste gas of PH section from to TPH section cluster wind for NOx content risees in the TPH section flue gas. Effectively reducing the direct discharge of pollutants.

2. The grate air flow system of the utility model can meet the requirement of ultralow emission of pellet NOx by only carrying out SNCR + SCR denitration treatment on PH section waste gas (about 1/3), and the investment and operation cost is greatly reduced; meanwhile, the TPH section and the part of the air box close to the PH section can be selectively merged into the PH section, so that the high-temperature preheating time of the pellets is indirectly prolonged, and the effect of improving the strength of the preheated pellets is achieved.

3. System simple structure, easy operation, the cost drops into lowly, and accuse wind reduces discharging effect is showing, has stronger application prospect and great economic benefits.

4. Air current control method simple accurate, control flow is short, through real-time data monitoring, can make the reaction in the time of extremely short, move through the air current balance plate simultaneously and become the mode of calculation and realize a dynamic fine setting, not only make the regulation of air current balance plate scientific and reasonable more, but also can effectively avoid influencing the problem emergence of production quality index because of the too big production fluctuation that leads to of adjustment stride violently.

Drawings

Fig. 1 is the schematic structural diagram of the anti-blow-by system of the preheating section of the chain grate machine.

Fig. 2 is the structural schematic diagram of the chain grate preheating section wind-channeling-preventing system with a detection mechanism.

Fig. 3 is a schematic structural view of the anti-wind channeling device of the present invention.

Fig. 4 is a schematic structural view of the airflow balance plate of the present invention.

Fig. 5 is a top view structure diagram of the wind channeling preventing device of the present invention.

Fig. 6 is a flow chart of the system for adjusting air pressure according to the present invention.

Reference numerals: 1: a chain grate machine; 2: a rotary kiln; 3: a wind channeling prevention device; 4: an ammonia agent denitration device; 5: an SCR denitration device; 6: a dust removal device; 7: a circular cooler; UDD: a forced air drying section; DDD: an air draft drying section; TPH: preheating for one section; pH: a second preheating stage; 301: an airflow balancing plate; 30101: an outer plate; 30102: an inner plate; 30103: a lifting motor; 302: a mobile platform; 30201: a fixed seat; 30202: a column; 30203: a moving motor; 303: a roller; 304: grooving; 401: a first sprayer; 402: a second sprayer; 403: an ammonia agent storage tank; c1: cooling in a ring for one section; c2: a ring cooling section; c3: ring cooling for three sections; l1: a first conduit; l2: a second conduit; l3: a third pipeline; l4: a fourth conduit; l5: a fifth pipeline; l6: a sixth pipeline; l7: a seventh pipe; l8: an eighth conduit; l9: a ninth conduit; l10: a tenth conduit; p1: a first pressure detector; p2: a second pressure detector; t1: a first temperature detector; t2: a second temperature detector; q1: a first flow detector; q2: a second flow rate detector; y: flue gas analyzer.

Detailed Description

The technical solution of the present invention is illustrated below, and the claimed invention includes but is not limited to the following embodiments.

An anti-wind-channeling system for a preheating section of a chain grate machine comprises the chain grate machine 1 and a rotary kiln 2. According to the trend of the materials, the chain grate 1 is sequentially provided with an air blowing drying section UDD, an air exhausting drying section DDD, a preheating section TPH and a preheating section PH. The preheating section PH is communicated with a smoke outlet of the rotary kiln 2 through a first pipeline L1. And an air channeling prevention device 3 is arranged between the preheating section TPH and the preheating section PH.

Preferably, the anti-blow-by device 3 includes an airflow balance plate 301, a moving platform 302, rollers 303, and a slot 304. The air flow balancing plate 301 is arranged inside the chain grate 1. The moving stages 302 are disposed at both sides of the outer lower ends of the preheating section TPH and the preheating section PH. The rollers 303 are disposed at the bottom of the moving platform 302. The slots 304 are formed at both sides of the outer upper ends of the preheating section TPH and the preheating section PH. The mobile platform 302 is further provided with a fixed seat 30201. The fixed seat 30201 is provided with an upright post 30202. The top end of the upright 30202 is connected to the top end of the air flow balance plate 301 after passing through the slot 304. A moving motor 30203 is also provided outside the moving platform 302. The moving motor 30203 drives the moving platform 302 to move on the roller 303. The moving platform 302 moves to drive the fixed seat 30201 and the upright post 30202 to move, and then the airflow balance plate 301 moves in the chain grate 1.

Preferably, the airflow balance plate 301 is composed of an outer plate 30101 and an inner plate 30102. The outer plate 30101 is a hollow plate. The inner plate 30102 is sleeved in the inner cavity of the outer plate 30101. The inner plate 30102 is also connected to a lift motor 30103. The lifting motor 30103 controls the inner plate 30102 to move in the vertical direction of the inner cavity of the outer plate 30101.

Preferably, the system also comprises an ammonia agent denitration device 4. The ammonia agent denitration device 4 is arranged in the preheating section PH and/or the first pipeline L1.

Preferably, the ammonia denitration device 4 includes a first sprayer 401, a second sprayer 402, and an ammonia storage tank 403. The first sprayer 401 is disposed in the preheating section PH. The second sprinkler 402 is disposed in the first pipe L1. The ammonia agent storage tank 403 is connected to the first sparger 401 through a second pipe L2. A third pipeline L3 is branched from the second pipeline L2 and connected with the second sprinkler 402.

Preferably, the system further comprises an SCR denitration device 5 and a dust removal device 6. And an air outlet of the preheating second section PH is communicated to an air inlet of the exhausting and drying section DDD through a fourth pipeline L4. And an air outlet of the induced draft drying section DDD is communicated to a chimney through a fifth pipeline L5. The SCR denitration device 5 is provided on the fourth duct L4. The dust removing device 6 is provided on the fifth pipe L5.

Preferably, the system further comprises a circulator 7. The ring cooling machine 7 is sequentially provided with a ring cooling first section C1, a ring cooling second section C2 and a ring cooling third section C3. An air outlet of the annular cooling section C1 is communicated to an air inlet of the rotary kiln 2 through a sixth pipeline L6. An air outlet of the annular cooling section C2 is communicated to an air inlet of the preheating section TPH through a seventh pipeline L7. And an air outlet of the annular cooling three-section C3 is communicated to an air inlet of the forced air drying section UDD through an eighth pipeline L8. The air outlet of the pre-heated section of TPH is communicated to a fifth pipeline L5 through a ninth pipeline L9. And an air outlet of the air blowing drying section UDD is communicated to a chimney through a tenth pipeline L10.

Preferably, the system further comprises a first pressure detector P1, a second pressure detector P2, a first temperature detector T1, a second temperature detector T2, a first flow detector Q1, a second flow detector Q2, and a flue gas analyzer Y. The first pressure detector P1, the first temperature detector T1 and the smoke analyzer Y are arranged in the preheating section of TPH. The second pressure gauge P2 and the second temperature gauge T2 are disposed within the preheating section PH. The first flow rate detector Q1 is provided on the seventh conduit L7. The second flow rate detector Q2 is provided on the first conduit L1.

Example 1

As shown in fig. 1, the system for preventing the blow-by of the preheating section of the chain grate machine comprises a chain grate machine 1 and a rotary kiln 2. According to the trend of the materials, the chain grate 1 is sequentially provided with an air blowing drying section UDD, an air exhausting drying section DDD, a preheating section TPH and a preheating section PH. The preheating section PH is communicated with a smoke outlet of the rotary kiln 2 through a first pipeline L1. And an air channeling prevention device 3 is arranged between the preheating section TPH and the preheating section PH.

Example 2

Embodiment 1 is repeated except that the blow-by preventing device 3 includes an airflow balance plate 301, a moving platform 302, rollers 303, and a slot 304. The air flow balancing plate 301 is arranged inside the chain grate 1. The moving stages 302 are disposed at both sides of the outer lower ends of the preheating section TPH and the preheating section PH. The rollers 303 are disposed at the bottom of the moving platform 302. The slots 304 are formed at both sides of the outer upper ends of the preheating section TPH and the preheating section PH. The mobile platform 302 is further provided with a fixed seat 30201. The fixed seat 30201 is provided with an upright post 30202. The top end of the upright 30202 is connected to the top end of the air flow balance plate 301 after passing through the slot 304. A moving motor 30203 is also provided outside the moving platform 302. The moving motor 30203 drives the moving platform 302 to move on the roller 303. The moving platform 302 moves to drive the fixed seat 30201 and the upright post 30202 to move, and then the airflow balance plate 301 moves in the chain grate 1.

Example 3

Embodiment 2 is repeated except that the air flow balance plate 301 is composed of an outer plate 30101 and an inner plate 30102. The outer plate 30101 is a hollow plate. The inner plate 30102 is sleeved in the inner cavity of the outer plate 30101. The inner plate 30102 is also connected to a lift motor 30103. The lifting motor 30103 controls the inner plate 30102 to move in the vertical direction of the inner cavity of the outer plate 30101.

Example 4

Example 3 was repeated except that the system further included an ammonia denitration device 4. The ammonia agent denitration device 4 is arranged in the preheating section PH and/or the first pipeline L1.

Example 5

Example 4 was repeated except that the ammonia agent denitration device 4 included a first sparger 401, a second sparger 402, and an ammonia agent storage tank 403. The first sprayer 401 is disposed in the preheating section PH. The second sprinkler 402 is disposed in the first pipe L1. The ammonia agent storage tank 403 is connected to the first sparger 401 through a second pipe L2. A third pipeline L3 is branched from the second pipeline L2 and connected with the second sprinkler 402.

Example 6

Example 5 was repeated except that the system further included SCR denitration device 5 and dust removal device 6. And an air outlet of the preheating second section PH is communicated to an air inlet of the exhausting and drying section DDD through a fourth pipeline L4. And an air outlet of the induced draft drying section DDD is communicated to a chimney through a fifth pipeline L5. The SCR denitration device 5 is provided on the fourth duct L4. The dust removing device 6 is provided on the fifth pipe L5.

Example 7

Example 6 is repeated except that the system also includes a circulator 7. The ring cooling machine 7 is sequentially provided with a ring cooling first section C1, a ring cooling second section C2 and a ring cooling third section C3. An air outlet of the annular cooling section C1 is communicated to an air inlet of the rotary kiln 2 through a sixth pipeline L6. An air outlet of the annular cooling section C2 is communicated to an air inlet of the preheating section TPH through a seventh pipeline L7. And an air outlet of the annular cooling three-section C3 is communicated to an air inlet of the forced air drying section UDD through an eighth pipeline L8. The air outlet of the pre-heated section of TPH is communicated to a fifth pipeline L5 through a ninth pipeline L9. And an air outlet of the air blowing drying section UDD is communicated to a chimney through a tenth pipeline L10.

Example 8

Example 7 is repeated except that the system further includes a first pressure gauge P1, a second pressure gauge P2, a first temperature gauge T1, a second temperature gauge T2, a first flow meter Q1, a second flow meter Q2, and a flue gas analyzer Y. The first pressure detector P1, the first temperature detector T1 and the smoke analyzer Y are arranged in the preheating section of TPH. The second pressure gauge P2 and the second temperature gauge T2 are disposed within the preheating section PH. The first flow rate detector Q1 is provided on the seventh conduit L7. The second flow rate detector Q2 is provided on the first conduit L1.

Claims

1. The utility model provides a chain grate machine preheating section prevents scurrying wind system which characterized in that: the system comprises a chain grate machine (1) and a rotary kiln (2); according to the trend of materials, the chain grate machine (1) is sequentially provided with a blast drying section (UDD), an air draft drying section (DDD), a preheating first section (TPH) and a preheating second section (PH); the preheating section (PH) is communicated with a smoke outlet of the rotary kiln (2) through a first pipeline (L1); an air channeling prevention device (3) is arranged between the preheating primary section (TPH) and the preheating secondary section (PH); an airflow balance plate (301) is arranged in the anti-wind-channeling device (3), and the thickness of the airflow balance plate (301) is 3-25 cm.

2. The grate preheating section blow-by prevention system of claim 1, wherein: the thickness of the airflow balance plate (301) is 5-20 cm.

3. The grate preheating section blow-by prevention system of claim 2, wherein: the thickness of the airflow balance plate (301) is 8-15 cm.

4. The chain grate preheating section wind channeling prevention system according to any one of claims 1 to 3, wherein: the anti-wind-channeling device (3) also comprises a moving platform (302), a roller (303) and a slot (304); the airflow balance plate (301) is arranged inside the chain grate (1); the mobile platforms (302) are arranged on two sides of the outer lower end of the preheating first section (TPH) and the preheating second section (PH); the roller (303) is arranged at the bottom of the movable platform (302); the slots (304) are arranged on two sides of the outer upper ends of the preheating section (TPH) and the preheating section (PH); a fixed seat (30201) is also arranged on the movable platform (302); an upright post (30202) is arranged on the fixed seat (30201); the top end of the upright post (30202) penetrates through the slot (304) and then is connected with the top end of the airflow balance plate (301); a moving motor (30203) is arranged outside the moving platform (302); the moving motor (30203) drives the moving platform (302) to move on the roller (303); the moving platform (302) drives the fixed seat (30201) and the upright post (30202) to move so as to drive the airflow balance plate (301) to move in the chain grate machine (1).

5. The grate preheating section blow-by prevention system of claim 4, wherein: the airflow balance plate (301) consists of an outer plate (30101) and an inner plate (30102); the outer plate (30101) is a plate body with a hollow interior; the inner plate (30102) is sleeved in the inner cavity of the outer plate (30101); the inner plate (30102) is also connected with a lifting motor (30103); the lifting motor (30103) controls the inner plate (30102) to move in the vertical direction of the inner cavity of the outer plate (30101).

6. The grate preheating section blow-by preventing system according to any one of claims 1 to 3 or 5, wherein: the system also comprises an ammonia agent denitration device (4); the ammonia agent denitration device (4) is arranged in the preheating section (PH) and/or the first pipeline (L1).

7. The grate preheating section blow-by prevention system of claim 4, wherein: the system also comprises an ammonia agent denitration device (4); the ammonia agent denitration device (4) is arranged in the preheating section (PH) and/or the first pipeline (L1).

8. The grate preheating section blow-by prevention system of claim 6, wherein: the ammonia agent denitration device (4) comprises a first sprayer (401), a second sprayer (402) and an ammonia agent storage tank (403); the first sprayer (401) is arranged in the preheating section (PH); the second sprinkler (402) being disposed within a first conduit (L1); the ammonia agent storage tank (403) is connected with the first sprayer (401) through a second pipeline (L2); a third pipeline (L3) is branched from the second pipeline (L2) and is connected with the second sprayer (402).

9. The grate preheating section blow-by prevention system of claim 7, wherein: the ammonia agent denitration device (4) comprises a first sprayer (401), a second sprayer (402) and an ammonia agent storage tank (403); the first sprayer (401) is arranged in the preheating section (PH); the second sprinkler (402) being disposed within a first conduit (L1); the ammonia agent storage tank (403) is connected with the first sprayer (401) through a second pipeline (L2); a third pipeline (L3) is branched from the second pipeline (L2) and is connected with the second sprayer (402).

10. The grate preheating section blow-by prevention system according to any one of claims 1 to 3, 5, and 7 to 9, wherein: the system also comprises an SCR denitration device (5) and a dust removal device (6); an air outlet of the preheating second section (PH) is communicated to an air inlet of the air draft drying section (DDD) through a fourth pipeline (L4); an air outlet of the air draft drying section (DDD) is communicated to a chimney through a fifth pipeline (L5); the SCR denitration device (5) is arranged on a fourth pipeline (L4); the dust removal device (6) is arranged on a fifth pipeline (L5).

11. The grate preheating section blow-by prevention system of claim 4, wherein: the system also comprises an SCR denitration device (5) and a dust removal device (6); an air outlet of the preheating second section (PH) is communicated to an air inlet of the air draft drying section (DDD) through a fourth pipeline (L4); an air outlet of the air draft drying section (DDD) is communicated to a chimney through a fifth pipeline (L5); the SCR denitration device (5) is arranged on a fourth pipeline (L4); the dust removal device (6) is arranged on a fifth pipeline (L5).

12. The grate preheating section blow-by prevention system of claim 6, wherein: the system also comprises an SCR denitration device (5) and a dust removal device (6); an air outlet of the preheating second section (PH) is communicated to an air inlet of the air draft drying section (DDD) through a fourth pipeline (L4); an air outlet of the air draft drying section (DDD) is communicated to a chimney through a fifth pipeline (L5); the SCR denitration device (5) is arranged on a fourth pipeline (L4); the dust removal device (6) is arranged on a fifth pipeline (L5).

13. The grate preheating section blow-by preventing system according to any one of claims 1 to 3, 5, 7 to 9, and 11 to 12, wherein: the system also comprises a circular cooler (7); the ring cooling machine (7) is sequentially provided with a ring cooling first section (C1), a ring cooling second section (C2) and a ring cooling third section (C3); an air outlet of the annular cooling section (C1) is communicated to an air inlet of the rotary kiln (2) through a sixth pipeline (L6); an air outlet of the annular cooling second section (C2) is communicated to an air inlet of the preheating first section (TPH) through a seventh pipeline (L7); the air outlet of the annular cooling three-section (C3) is communicated to the air inlet of the blast drying section (UDD) through an eighth pipeline (L8); the air outlet of the preheating section (TPH) is communicated to a fifth pipeline (L5) through a ninth pipeline (L9); the air outlet of the forced air drying section (UDD) is communicated to a chimney through a tenth pipeline (L10).

14. The grate preheating section blow-by prevention system of claim 4, wherein: the system also comprises a circular cooler (7); the ring cooling machine (7) is sequentially provided with a ring cooling first section (C1), a ring cooling second section (C2) and a ring cooling third section (C3); an air outlet of the annular cooling section (C1) is communicated to an air inlet of the rotary kiln (2) through a sixth pipeline (L6); an air outlet of the annular cooling second section (C2) is communicated to an air inlet of the preheating first section (TPH) through a seventh pipeline (L7); the air outlet of the annular cooling three-section (C3) is communicated to the air inlet of the blast drying section (UDD) through an eighth pipeline (L8); the air outlet of the preheating section (TPH) is communicated to a fifth pipeline (L5) through a ninth pipeline (L9); the air outlet of the forced air drying section (UDD) is communicated to a chimney through a tenth pipeline (L10).

15. The grate preheating section blow-by prevention system of claim 6, wherein: the system also comprises a circular cooler (7); the ring cooling machine (7) is sequentially provided with a ring cooling first section (C1), a ring cooling second section (C2) and a ring cooling third section (C3); an air outlet of the annular cooling section (C1) is communicated to an air inlet of the rotary kiln (2) through a sixth pipeline (L6); an air outlet of the annular cooling second section (C2) is communicated to an air inlet of the preheating first section (TPH) through a seventh pipeline (L7); the air outlet of the annular cooling three-section (C3) is communicated to the air inlet of the blast drying section (UDD) through an eighth pipeline (L8); the air outlet of the preheating section (TPH) is communicated to a fifth pipeline (L5) through a ninth pipeline (L9); the air outlet of the forced air drying section (UDD) is communicated to a chimney through a tenth pipeline (L10).

16. The grate preheating section blow-by prevention system of claim 13, wherein: the system also comprises a first pressure detector (P1), a second pressure detector (P2) and a smoke analyzer (Y); the first pressure detector (P1) and the smoke analyzer (Y) are arranged in the preheating section (TPH); the second pressure detector (P2) is disposed in the preheating section (PH).

17. The chain grate preheating section blow-by preventing system according to claim 14 or 15, wherein: the system also comprises a first pressure detector (P1), a second pressure detector (P2) and a smoke analyzer (Y); the first pressure detector (P1) and the smoke analyzer (Y) are arranged in the preheating section (TPH); the second pressure detector (P2) is disposed in the preheating section (PH).

18. The grate preheating section blow-by prevention system of claim 16, wherein: the system also comprises a first temperature detector (T1) and a second temperature detector (T2); the first temperature detector (T1) is disposed in the preheating section (TPH); the second temperature detector (T2) is disposed in the preheating section (PH).

19. The grate preheating section blow-by prevention system of claim 17, wherein: the system also comprises a first temperature detector (T1) and a second temperature detector (T2); the first temperature detector (T1) is disposed in the preheating section (TPH); the second temperature detector (T2) is disposed in the preheating section (PH).

20. The grate preheating section blow-by prevention system of any one of claims 16, 18-19, wherein: the system also comprises a first flow detection meter (Q1) and a second flow detection meter (Q2); the first flow rate detection meter (Q1) is provided on a seventh piping (L7); the second flow rate detector (Q2) is provided on the first pipe (L1).

21. The grate preheating section blow-by prevention system of claim 17, wherein: the system also comprises a first flow detection meter (Q1) and a second flow detection meter (Q2); the first flow rate detection meter (Q1) is provided on a seventh piping (L7); the second flow rate detector (Q2) is provided on the first pipe (L1).