CN109269310B - A sinter waste heat recovery device and method based on a vertical cold kiln - Google Patents

Abstract

The invention discloses a sinter waste heat recovery device and method based on a vertical cooling kiln, belongs to the technical field of sinter waste heat recovery, and solves the problem of low utilization rate of sinter sensible heat recovery in the prior art. The device includes a sintering machine, an air box, a flue and a vertical cooling kiln; along the running direction of the sintering machine, the flue is divided into a section A flue, a B section flue and a C section flue; along the vertical cooling kiln from top to bottom, the vertical The cold kiln is divided into a high-temperature section and a low-temperature section; the flue outlet of section A is connected to the desulfurization unit, low-temperature section, SCR denitrification unit and chimney, and the flue gas in section B is circulated to the corresponding sintering machine part of the flue of section A . The method is that the flue gas from section B is circulated to the sintering machine corresponding to the flue of section A; the flue gas from section A is desulfurized, heat-exchanged with the sintered ore in the low-temperature section and denitrated sequentially; the flue gas from section C is exchanged with the sintered ore in the high-temperature section, and used The waste heat recovery unit performs waste heat recovery. The above device and method can be used for waste heat recovery of sintering ore.

Description

A sinter waste heat recovery device and method based on a vertical cold kiln

technical field

The invention relates to a sinter waste heat recovery technology, in particular to a sinter waste heat recovery device and method based on a vertical cooling kiln.

Background technique

my country's iron and steel production is dominated by the blast furnace-converter long process, and the proportion of converter steel reaches more than 90%. The proportion of sinter in my country's blast furnace charge structure reaches 70% to 75%. In 2014, my country's sinter output reached 901 million tons. In 2013, the state promulgated and implemented the "Crude Steel Production Main Process Unit Product Energy Consumption Limit" (GB21256-2013), which stipulates that the sintering process unit product energy consumption limit value is ≤55kgce/t, and the access value is ≤50kgce/t, advanced The value is ≤45kgce/t, and the advanced value of waste heat recovery is ≥10kgce/t. The improvement of energy consumption standards will increase the operating pressure of enterprises, prompting enterprises that do not meet the requirements to withdraw from the market, and the pressure on enterprises is huge.

At present, the use of sinter waste heat is mainly to cool the sinter by blowing air on the belt cooler or ring cooler. The cold air blown from the bottom exchanges heat with the sinter when it passes through the hot sinter layer, generating a large amount of high-temperature waste gas. Exhaust gases can be used to preheat combustion air for ignition, generate steam, or generate electricity. However, this waste heat recovery method has a low utilization rate of sensible heat of sinter.

Contents of the invention

In view of the above analysis, the present invention aims to provide a sinter waste heat recovery device and method based on a vertical cooling kiln, which solves the problem of low recycling rate of sinter sensible heat in the prior art.

The purpose of the present invention is mainly achieved through the following technical solutions:

On the one hand, the present invention provides a sinter waste heat recovery device based on a vertical cooling kiln, which includes a sintering machine, an air box, a flue and a vertical cooling kiln connected in sequence; along the running direction of the sintering machine, the flue is divided into a section A flue , B-section flue and C-section flue; along the vertical cooling kiln from top to bottom, the vertical cooling kiln is divided into a high-temperature section and a low-temperature section; the smoke outlet of the A-section flue is connected with the desulfurization unit, low-temperature section, and SCR denitrification The unit is connected to the chimney, the flue gas in the section B flue is circulated to the corresponding sintering machine part of the A section flue, and the smoke outlet of the C section flue is connected with the high temperature section, the C section waste heat utilization unit and the chimney in turn; the B section flue flue gas SO ₂ concentration in section C > flue gas SO ₂ concentration in section C > flue gas SO ₂ concentration in section A; flue gas NO _X concentration in section A > flue gas NO _x concentration in section B > The flue gas NO _X concentration of the C-section flue.

In a possible design, the ratio of the number of bellows corresponding to the section A flue, the section B flue, and the section C flue is 14-16:5-9:4-6.

In a possible design, the temperature of the sintered ore at the smoke outlet of the low temperature section is 400°C-450°C.

In a possible design, the smoke inlet of the high temperature section is set at the lower part of the high temperature section, and the smoke outlet is set at the upper part of the high temperature section; the smoke inlet of the low temperature section is set at the lower part of the low temperature section, and the smoke outlet is set at the lower part of the low temperature section. the upper part of the segment.

In a possible design, an induced draft fan is installed on the connecting pipeline between the flue in section A and the desulfurization unit, and on the connecting pipeline between the flue in section C and the high temperature section.

In a possible design, an induced fan dust collector is arranged in front of the air inlet of the induced fan.

In a possible design, a vertical cooling kiln dust collector is installed on the connecting pipeline between the high temperature section and the C-section waste heat utilization unit, and on the connecting pipeline between the low temperature section and the SCR denitrification unit.

In a possible design, the connecting pipe between the SCR denitrification unit and the chimney is provided with a section A waste heat utilization unit.

In a possible design, the device also includes a crushing screen through which the sintered ore in the sintering machine falls into the high temperature section.

On the other hand, the present invention also provides a sinter waste heat recovery method based on a vertical cooling kiln, using the above-mentioned sinter waste heat device based on a vertical cooling kiln, the method includes the following steps:

The sintering raw materials are sent to the sintering machine for sintering, and flue gas is generated while producing sintered finished ore; the flue gas in section B is circulated to the part of the sintering machine corresponding to the flue of section A; the flue gas in section A is desulfurized by the desulfurization unit, and the flue gas after desulfurization Heat exchange with the sintered ore in the low-temperature section of the vertical cooling kiln, so that the temperature of the mixed flue gas rises to an appropriate temperature for SCR denitrification, and denitrification is performed; the flue gas in section C is exchanged with the sintered ore in the high-temperature section of the vertical cooling kiln to obtain The high-temperature flue gas is recovered by using the waste heat recovery unit.

Compared with the prior art, the beneficial effects of the present invention are as follows:

a) In the sinter waste heat recovery device based on the vertical cooling kiln provided by the present invention, the flue is divided into a section flue, a B section flue and a C section flue, and the vertical cooling kiln is divided into a high temperature section and a low temperature section, effectively The waste heat recovery rate of the flue gas after heat exchange can be increased by more than 50%, the total amount of waste heat recovery is greatly improved, and the flue gas and sinter sensible heat can be recovered to the maximum extent (almost all recovery). Regarding flue gas quality, the flue gas in the high-temperature section C exchanges heat with the high-temperature section to obtain high-temperature flue gas, and the mixed flue gas in section A exchanges heat with the low-temperature section to obtain medium-temperature flue gas, which improves the flue gas carrying sensible heat of sinter Quality, overcoming the disadvantages of low steam quality and unstable flow produced by traditional coolers, and laying a good foundation for subsequent production of steam quality from improving power generation per ton of sinter. At the same time, regarding the quality of sinter, hot sinter has the function of heat preservation in the high-temperature section, and the process of temperature homogenization and residual volatile precipitation is carried out. Therefore, after passing through the high-temperature section, the maturity of sinter is further improved, raw ore is basically eliminated, and sinter During the downward flow of the high temperature section, the sinter is subjected to mechanical force, the fragile part and the raw ore part can be screened out, and the yield of the finished product is improved. It has changed the situation that the cooler is only limited to sinter cooling and cannot recover sensible heat efficiently.

b) The sinter waste heat recovery device based on the vertical cooling kiln provided by the present invention can fully recover sinter and sinter flue gas waste heat, reduce SO _x and NO _x emissions, reduce dust emissions, and protect the environment. Since the cooling gas cools the sintered ore in the closed tank, and the tank is positioned to connect to the ore, the dust is easily controlled. Through cyclic work, the repeated utilization rate of resources is improved, and the work efficiency is also improved, thereby further improving the utilization rate of heat energy. It has the advantages of short process, strong applicability, low investment and operating costs, etc. It can be used as a supporting construction for enterprises with existing sintering desulfurization processes, or it can be newly built together with mature sintering flue gas desulfurization processes, which has great application value.

c) The sinter waste heat recovery device based on the vertical cooling kiln provided by the present invention, for the flue gas of the C section, high temperature, low _NOx and low SO ₂ , the flue gas of the C section is passed into the high temperature section, because the temperature of the sinter at the top of the high temperature section is 700 Therefore, the temperature of the flue gas in the C section after heat exchange can reach about 680°C, which is significantly higher than that of the existing technology, and the waste heat of the flue gas in the C section and the sintering ore in the high temperature section can be effectively recovered through the waste heat recovery unit. For the flue gas of section A and flue gas of section B, the flue gas of section B is circulated to the part of the sintering machine corresponding to the flue of section A, so that the flue gas of section B is mixed with the flue gas in the flue of section A, so that SO ₂ is mixed and enriched, The mixed flue gas in section A is obtained. The temperature of the mixed flue gas in section A is about 100°C, which is suitable for desulfurization. Therefore, flue gas desulfurization can be performed directly; Heat exchange, the temperature can rise to about 350°C, which is suitable for SCR denitrification, therefore, the flue gas denitrification treatment can be carried out directly. The waste heat recovery device of the present invention, by segmenting the flue and the vertical cooling kiln, not only effectively recovers the high-temperature C-section flue gas and the sensible heat of the high-temperature section sinter, but also enables the mixed A-section flue gas to directly reach Suitable temperature for desulfurization and SCR denitrification, no additional burner required.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof.

Description of drawings

The drawings are for the purpose of illustrating specific embodiments only and are not to be considered as limitations of the invention, and like reference numerals refer to like parts throughout the drawings.

Fig. 1 is the structural representation of the sinter waste heat recovery device of the present invention;

Fig. 2 is a schematic diagram of gas-solid heat exchange in the vertical cooling kiln of the sinter waste heat recovery device of the present invention;

Fig. ₃ is a graph of SO2 concentration, _NOx concentration and temperature of flue gas in each section.

Reference signs:

1-Sintering machine; 2-Blower box; 3-A section flue; 4-B section flue; 5-C section flue; 6-High temperature dust collector; 7-Induced fan; 8-High temperature section; Gravity dust collector; 10-C section waste heat utilization unit; 11-chimney; 12-circulating flue gas hood; 13-crushing screen; 14-electrostatic precipitator; section; 18-A section waste heat utilization unit; 19-SCR denitrification unit.

Detailed ways

Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and are used together with the embodiments of the present invention to explain the principles of the present invention.

On the one hand, the present invention provides a sinter waste heat recovery device based on a vertical cooling kiln, see Fig. 1 to Fig. 3, including a sintering machine 1, an air box 2, a flue and a vertical cooling kiln connected in sequence; running along the sintering machine 1 direction, the flue is divided into A-section flue 3, B-section flue 4 and C-section flue 5; along the direction from top to bottom of the vertical cooling kiln, the vertical cooling kiln is divided into high-temperature section 8 and low-temperature section 17; The smoke outlet of channel 3 is connected with desulfurization unit 16, low temperature section 17, SCR denitrification unit 19 and chimney 11 in sequence, and the smoke outlet of section B flue 4 is connected to the sintering machine corresponding to section A flue 3 through circulating flue gas hood 12 The smoke inlet of section 1 is connected, the flue gas in section B flue 4 is circulated to the sintering machine part corresponding to section A flue 3, and the smoke outlet of section C flue 5 is connected with high temperature section 8 and C section waste heat utilization unit in turn 10 (for example, waste heat power generation device, etc.) is connected with the chimney 11; the flue gas SO concentration of the B section flue ₄ > the flue gas SO concentration of the C section flue ₅ > the flue gas SO concentration of the A section flue ₃ ; The flue gas NO _X concentration of flue gas 3 in section A > the flue gas NO _x concentration of flue gas 4 in section B > the flue gas NO _x concentration of flue gas 5 in section C, that is to say, the flue gas in flue 3 of section A is low temperature High NO _X and low SO ₂ , the flue gas of section B flue 4 is medium temperature, medium NO _x and high SO ₂ , and the flue gas of C section flue 5 is high temperature, low NO _X and low SO ₂ .

It can be understood that along the running direction of the sintering machine 1, the temperature of the sintered ore gradually increases, so the temperature of the flue gas also gradually increases, and the flue gas temperature of the flue 5 in the C section is greater than the flue gas temperature of the flue 4 in the B section > Flue gas temperature of section A flue 3.

During implementation, the flue gas from section B is circulated to the part of the sintering machine corresponding to the flue 3 of the section A, so that the flue gas from the section B reacts with the part of the material layer of the sintering machine corresponding to the flue 3 of the section A, so that SO ₂ is mixed and enriched, The flue gas in section A passes through the desulfurization unit 16 to remove SO ₂ , and then exchanges heat between the flue gas in section A and the sintered ore in the low-temperature section 17 of the vertical cooling kiln, so that the temperature of the flue gas in section A rises to a suitable temperature for SCR denitrification, and denitrification is performed; The flue gas in section C is exchanged with the sintered ore in the high-temperature section 8 of the vertical cooling kiln to obtain high-temperature flue gas, and the waste heat recovery unit is used for waste heat recovery.

It should be noted that the sinter vertical cooling kiln cooling technology is a brand-new sinter cooling and waste heat recovery process technology. The cooling air blasted from the lower part of the vertical cooling kiln performs reverse heat exchange; while the cooling air cools the sinter, its own temperature gradually rises. After reaching the upper material surface of the vertical cooling kiln, the temperature can reach about 380 ° C ~ 450 ° C. into high temperature hot air.

Compared with the prior art, in the sinter waste heat recovery device based on the vertical cooling kiln provided by the present invention, the flue is divided into the A-section flue 3, the B-section flue 4 and the C-section flue 5, and the vertical cooling kiln is divided into high-temperature Section 8 and low-temperature section 17 can effectively recover the waste heat of the flue gas after heat exchange by more than 50%, the total amount of waste heat recovery is greatly improved, and the maximum recovery of flue gas and sinter sensible heat (almost all recovery) . Regarding the flue gas quality, the flue gas in the high-temperature section C exchanges heat with the high-temperature section 8 to obtain high-temperature flue gas, and the mixed flue gas in section A exchanges heat with the low-temperature section 17 to obtain medium-temperature flue gas, which improves the capacity of carrying sensible heat of sinter The quality of flue gas overcomes the disadvantages of low steam quality and unstable flow produced by traditional coolers, and lays a good foundation for the subsequent production of steam quality to improve the power generation per ton of sinter. At the same time, regarding the quality of the sinter, the hot sinter has the function of heat preservation in the high temperature section 8, and the process of temperature homogenization and residual volatile precipitation is carried out. Therefore, after passing through the high temperature section 8, the maturity of the sinter is further improved, and the raw ore is basically eliminated. During the downward flow of the sinter in the high temperature section 8, the sinter is subjected to mechanical force, the fragile part and the raw ore part can be screened out, the yield of the finished product is improved, the air leakage of the traditional cooler is overcome, and only the sintering waste heat resource with a higher temperature is recovered Such disadvantages have changed the situation that the cooler is limited to sinter cooling and cannot recover sensible heat efficiently.

In addition, the above waste heat recovery device can fully recover the waste heat of sintering ore and sintering flue gas, reduce SO _x and NO _x emissions, reduce dust emissions, and protect the environment. Since the cooling gas cools the sintered ore in the closed tank, and the tank is positioned to connect to the ore, the dust is easily controlled. Through cyclic work, the repeated utilization rate of resources is improved, and the work efficiency is also improved, thereby further improving the utilization rate of heat energy. It has the advantages of short process, strong applicability, low investment and operating costs, etc. It can be used as a supporting construction for enterprises with existing sintering desulfurization processes, or it can be newly built together with mature sintering flue gas desulfurization processes, which has great application value.

Specifically, if the flue and the vertical cooling kiln are not divided into sections, the flue gas directly exchanges heat with the vertical cooling kiln as a whole, and the temperature of the flue gas obtained can only reach about 380 ° C ~ 450 ° C, while for the flue gas in the C section, High temperature, low NO _X and low SO ₂ , the flue gas in section C is passed into high temperature section 8, and since the temperature of the sinter at the top of high temperature section 8 is about 700°C, the temperature of the flue gas in section C after heat exchange can reach about 680°C, It is obviously higher than that of the prior art, and the flue gas in section C and the waste heat of sinter in high-temperature section 8 can be effectively recovered through the waste heat recovery unit. For the flue gas in section A and flue gas in section B, the flue gas in section B is circulated to the part of sintering machine 1 corresponding to flue 3 in section A, so that the flue gas in section B is mixed with the flue gas in flue 3 in section A, so that SO ₂ is mixed , enrichment, and get mixed A-section flue gas. The mixed A-section flue gas temperature is about 100°C, which is suitable for desulfurization. Therefore, flue gas desulfurization treatment can be directly carried out; A-section flue gas after desulfurization treatment , exchanging heat with the low-temperature section 17, the temperature can rise to about 350°C, which is suitable for SCR denitrification, therefore, the flue gas denitrification treatment can be directly carried out. The waste heat recovery device of the present invention, by segmenting the flue and the vertical cooling kiln, not only effectively recovers the high-temperature C-section flue gas and the sensible heat of the high-temperature section 8 sinter, but also enables the mixed A-section flue gas to directly To achieve the appropriate temperature for desulfurization and SCR denitrification, no additional burner is required.

For the sectioning of the flue, specifically, the ratio of the number of bellows corresponding to the flue 3 in section A, the flue 4 in section B, and the flue 5 in section C is 14-16:5-9:4-6. Exemplarily, the total number of wind boxes 2 of the existing sintering machine is usually about 27 (wind boxes No. The number of bellows corresponding to channel 4 can be 6, and the number of bellows corresponding to section C flue 5 can be 6, that is to say, the number of bellows corresponding to section A flue 3 is No. The corresponding bellows are No. 16-21, and the bellows corresponding to section C flue 5 are No. 22-27.

In order to enable the flue gas to fully exchange heat with the sinter, the smoke inlet of the high temperature section 8 is set at the lower part of the high temperature section 8, and the smoke outlet is set at the upper part of the high temperature section 8; similarly, the smoke inlet of the low temperature section 17 is set at The lower part of the low temperature section 17, the smoke outlet is arranged on the upper part of the low temperature section 17.

In order to make the desulfurized A-stage flue gas exchange heat with the low-temperature section 17, the temperature can reach the temperature suitable for SCR denitrification (about 350°C), the temperature of the sintered ore at the smoke outlet of the low-temperature section 17 should be controlled at 400°C~ In this way, when the desulfurized A-stage flue gas exchanges heat with the sintered ore in the low-temperature section 17, the temperature of the A-stage flue gas can directly reach the temperature suitable for SCR denitrification without additional burners or a cooling unit, thereby saving energy and simplifying the structure of the above-mentioned waste heat recovery device.

It can be understood that in order to allow the flue gas generated by the sintering machine 1 to enter the wind box 2 and related pipelines, the connecting pipeline between the flue 3 in section A and the desulfurization unit 16 and the connecting pipe between the flue 5 in section C and the high temperature section 8 Induced draft fans 7 are all provided on the road. Through the induced draft fan 7, the flue gas generated by the sintering machine 1 can be introduced into the wind box 2, and further introduced into the flue corresponding to each section of the wind box 2, so as to realize the flow and treatment of the flue gas.

In order to avoid the dust in the A-section flue gas and the C-section flue gas from blocking the induced draft fan 7, an induced draft fan dust collector (for example, a high-temperature dust collector 6 or an electrostatic precipitator 14) can be set before the air inlet of the induced fan 7.

Considering that after the flue gas passes through the vertical cooling kiln, the sinter in the vertical cooling kiln will still produce dust under the action of waste heat and enter the flue gas. In order to prevent this part of dust from polluting subsequent equipment and the atmosphere, it can 8 and C-section waste heat utilization unit 10 and on the connecting pipeline between low temperature section 17 and SCR denitrification unit 19, a vertical cold kiln dust collector (for example, the first gravity dust collector 9 and the second gravity dust collector 15) is arranged, through The vertical cooling kiln dust collector removes the dust in the flue gas after passing through the vertical cooling kiln.

In order to further improve the utilization rate of waste heat recovery of the above-mentioned device, a section A waste heat utilization unit 18 may be installed on the connecting pipe between the SCR denitrification unit 19 and the chimney 11 . This is because, after denitrification, the temperature of the flue gas in section A can still be maintained at about 350°C, and the sensible heat of flue gas in section A after denitration can be recovered by the waste heat utilization unit 18 in section A, so as to improve the waste heat recovery utilization rate of the above-mentioned device.

It can be understood that, in order to allow the sintered ore to fall into the high temperature section 8 , the above device also includes a crushing screen 13 through which the sintered ore in the sintering machine 1 falls into the high temperature section 8 .

On the other hand, the present invention also provides a sinter waste heat recovery method based on a vertical cooling kiln, using the above-mentioned sinter waste heat device based on a vertical cooling kiln, including the following steps:

The raw materials for sintering (such as iron ore, fuel, flux, returned ore, and returned materials, etc.) are sent to the sintering machine for sintering, and flue gas is produced while producing sintered finished ore; the flue gas in section B is circulated to the flue corresponding to section A Sintering machine part: the flue gas in section A is desulfurized by the desulfurization unit, and the desulfurized flue gas exchanges heat with the sinter in the low-temperature section of the vertical cooling kiln, so that the temperature of the mixed flue gas rises to the appropriate temperature for SCR denitrification, and denitrification is performed; The flue gas in section C exchanges heat with the sinter in the high-temperature section of the vertical cooling kiln to obtain high-temperature flue gas, which is recovered by using the waste heat recovery unit.

Compared with the prior art, the beneficial effects of the vertical kiln-based sinter waste heat recovery method provided by the present invention are basically the same as those of the above-mentioned vertical kiln-based sinter waste heat recovery device, and will not be repeated here.

Embodiment one

Taking a 210m ² sintering machine of a certain steel as an example, there are 27 bellows in total, and the flue gas concentration is shown in Table 1.

Mix the flue gas from No. 1-15 sintering bellows into section A flue, mix the flue gas from No. 16-21 sintering bellows into B-section flue, mix the flue gas from No. 22-27 sintering bellows into C-section flue The flue gas volume of section B is 210,000 Nm ³ /h, the temperature is 77°C, the concentration of SO ₂ is 506 mg/Nm ³ , and the concentration of NO _x is 245 mg/Nm ³ ; the flue gas volume of section B is 130,000 Nm ³ /h, the temperature is 178°C, ₂ Concentration 2018mg/Nm ³ , _NOx concentration 103mg/Nm ³ ; C-section flue gas volume 170,000 Nm ³ /h, temperature 318°C, SO ₂ concentration 1447mg/Nm ³ , _NOx concentration 15mg/Nm ³ .

Pass the flue gas from section C into the high-temperature section and exchange heat with the hot sinter. The temperature of the sinter is 700°C. The front section of the machine makes full use of the temperature of the sintering flue gas and enriches SO2 at the same time _; after the dust removal and desulfurization of section A, it is passed into the low-temperature section, the temperature of the sintering ore is 400°C, and the temperature of the medium-temperature flue gas is about 350°C after heat exchange. The waste heat boiler recovers the waste heat of the flue gas.

The waste heat recovery of sintering flue gas is divided into high-quality (680°C) and low-quality (300°C), which can be used in a wider range.

Table 1 Smoke concentration table

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention.

Claims (10)

1. a kind of based on the sinter waste-heat recovery device for erecting cold kiln, which is characterized in that including sequentially connected sintering machine, wind Case, flue and erect cold kiln；Along sintering machine traffic direction, the flue is divided into A sections of flues, B sections of flues and C sections of flues；It is cold along erecting Kiln direction from top to bottom, it is described to erect cold kiln and be divided into high temperature section and low-temperature zone；

The outlet flue of the A sections of flue is successively connect with desulfurization unit, low-temperature zone, SCR denitration unit and chimney, the B sections of cigarette Flue gas recirculation in road to the corresponding sintering machine partial of A sections of flues, the outlet flue of the C sections of flue successively with high temperature section, more than C sections Heat utilization unit is connected with chimney；

The flue gas SO of the B sections of flue₂The flue gas SO of C sections of flues of concentration >₂The flue gas SO of A sections of flues of concentration >₂Concentration；A sections of cigarettes The flue gas NO in road_XThe flue gas NO of B sections of flues of concentration >_XThe flue gas NO of C sections of flues of concentration >_XConcentration.

2. according to claim 1 based on the sinter waste-heat recovery device for erecting cold kiln, which is characterized in that the A sections of cigarette Road, B section flue and the ratio of the corresponding bellows number of C sections of flues are 14~16:5~9:4~6.

3. according to claim 1 based on the sinter waste-heat recovery device for erecting cold kiln, which is characterized in that the low-temperature zone Outlet flue at, the temperature of sinter is 400 DEG C~450 DEG C.

4. according to claim 1 based on the sinter waste-heat recovery device for erecting cold kiln, which is characterized in that the high temperature section Smoke inlet be set to the lower part of high temperature section, outlet flue is set to the top of high temperature section；The smoke inlet of the low-temperature zone is set to The lower part of low-temperature zone, outlet flue are set to the top of low-temperature zone.

5. according to claim 1 based on the sinter waste-heat recovery device for erecting cold kiln, which is characterized in that the A sections of cigarette Air-introduced machine is equipped on the connecting line of road and desulfurization unit and on C sections of flue and the connecting line of high temperature section.

6. according to claim 5 based on the sinter waste-heat recovery device for erecting cold kiln, which is characterized in that the air-introduced machine Air inlet before be equipped with air-introduced machine deduster.

7. according to claim 1 based on the sinter waste-heat recovery device for erecting cold kiln, which is characterized in that the high temperature section With on the connecting line of C sections of UTILIZATION OF VESIDUAL HEAT IN units and low-temperature zone with setting on the connecting line of SCR denitration unit is erected cold kiln and removed Dirt device.

8. according to claim 1 based on the sinter waste-heat recovery device for erecting cold kiln, which is characterized in that the SCR is de- The connecting pipe of nitre unit and chimney is equipped with A sections of UTILIZATION OF VESIDUAL HEAT IN units.

9. according to any one of claims 1 to 8 based on the sinter waste-heat recovery device for erecting cold kiln, which is characterized in that It further include broken sieve, the sinter in the sintering machine is fallen into high temperature section by broken sieve.

10. a kind of based on the sinter exhaust heat recovering method for erecting cold kiln, which is characterized in that using such as any one of claim 1 to 9 It is described based on the sinter waste heat apparatus for erecting cold kiln, described method includes following steps:

Raw materials for sintering feeding sintering machine is sintered, generates flue gas while producing sintering finished ores；B sections of flue gas recirculations are to A The corresponding sintering machine partial of section flue；A sections of flue gases pass through desulfurization unit desulfurization, and the flue gas after desulfurization is burnt with the low-temperature zone for erecting cold kiln Knot mine exchanges heat, so that mixed flue-gas temperature rises to the suitable temperature of SCR denitration, carries out denitration；By C sections of flue gases and erect The high temperature section sinter of cold kiln exchanges heat, and obtains high-temperature flue gas, carries out waste heat recycling using waste heat recovery unit.