CN111569652A - An integrated device for dry desulfurization, denitrification and purification of kiln flue gas - Google Patents

Abstract

The invention discloses an integrated device for dry desulfurization, denitrification and purification of kiln flue gas, comprising a desulfurization tower, wherein the desulfurization tower is connected with a flue gas heat energy recovery component; The dehumidifier is connected with a number of SCR denitration catalytic components, and the SCR denitration catalytic components are connected with a chimney; the flue gas heat energy recovery component includes a heat energy recovery box, and the heat energy recovery box has a heat energy recovery component; the heat energy recovery component is used to recover high-temperature smoke The heat energy of the gas is recovered through heat exchange. The above-mentioned device components are used to design the high-temperature flue gas to exchange heat with the cold water through the heat energy recovery component. After the cold water is heated, it is discharged from the high-temperature water outlet pipe to realize the recovery and utilization of heat energy.

Description

An integrated device for dry desulfurization, denitrification and purification of kiln flue gas

technical field

The invention relates to the field of kiln flue gas purification and treatment devices, in particular to an integrated device for kiln flue gas dry desulfurization, denitration and purification.

Background technique

With the development of industrialized production in China, the exploitation and utilization of energy is an important prerequisite for industrialized production. At present, my country's coke production capacity is relatively large. Based on the extensive mining and application of coal, my country has become a coke producer and consumer in the world. In the process of energy utilization, such as the combustion and utilization of coal in a kiln, a large amount of flue gas will be generated. The flue gas contains a large amount of sulfur dioxide and nitrogen oxides. The above sulfur dioxide and nitrogen oxides are one of the main factors that form acid rain. It is also the main factor causing air pollution.

Based on the importance of environmentally friendly production, regarding the purification of coal-fired flue gas, the removal of large amounts of sulfur dioxide and nitrogen oxides in flue gas through purification treatment is an important measure for environmental protection of flue gas at this stage.

Therefore, there are many reports on the technical improvement of coal-fired flue gas purification treatment in the prior art. For example, the Chinese patent application number is: 201810200697.5, which discloses "a novel process for flue gas desulfurization and denitrification", and the following improvements are recorded in the patent document. Process: A new type of flue gas desulfurization process is to separate the original flue gas through pre-dust removal, pre-oxidation stage, desulfurization and denitrification steps, and post-dust removal steps. Pre-dust removal can reduce the content of suspended particles in the flue gas and facilitate subsequent desulfurization and denitrification. , in the pre-oxidation stage, the NO content in the flue gas can be removed, and the corresponding acid can be generated at the same time, and the generated acid can react with the alkaline substance to prepare the materials required for the building. , specifically including the mixture of coal gangue, magnesium oxide and sodium carbonate, and finally the treated flue gas is dedusted to prevent the dust of the desulfurization and denitrification agent from entering the atmosphere and cause secondary pollution. recycling, thereby reducing costs.

However, in the improvement of the technical solutions disclosed in the prior art and the above-mentioned patents, there is a technical defect that the thermal energy in the flue gas is not recycled, resulting in a large amount of thermal energy in the high-temperature flue gas that cannot be recycled and reused, which not only causes energy waste, but also cannot reduce cost of industrial production.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide an integrated device for dry desulfurization, denitration and purification of kiln flue gas.

The present invention solves the above-mentioned technical problems through the following technical solutions:

An integrated device for dry desulfurization, denitrification and purification of kiln flue gas, comprising a desulfurization tower, and the desulfurization tower is connected with a flue gas heat energy recovery component;

The flue gas heat energy recovery component is connected with a number of dehumidifiers; the dehumidifier is connected with a number of SCR denitration catalytic components, and the SCR denitration catalytic component is connected with a chimney;

The flue gas heat energy recovery assembly includes a heat energy recovery box, the top of the heat recovery box is connected with a high temperature water outlet pipe, and the bottom of the heat energy recovery box is connected with a low temperature water inlet pipe;

A thermal energy recovery cavity is arranged in the thermal energy recovery box, and a thermal energy recovery component is arranged in the thermal energy recovery cavity;

The heat energy recovery component includes a second smoke plate and a first smoke plate arranged at intervals in the front and the rear, and a smoke cavity is arranged in the first smoke plate and the second smoke plate, and the first smoke plate is provided with a smoke cavity. A number of heat energy recovery pipe fittings are communicated between the gas plate and the second flue gas plate, and the heat energy recovery pipe fittings all include red copper tubes. The radiating fin has an inner end and an outer end, the inner end of the radiating fin is located in the tube cavity of the red copper tube, and the outer end of the radiating fin is located outside the red copper tube;

The first flue gas plate is communicated with a smoke inlet pipe, and the second flue gas plate is communicated with a smoke outlet pipe;

The smoke inlet pipe is connected to the smoke outlet end of the desulfurization tower, and the smoke outlet pipe is connected to the smoke inlet end of the dehumidifier.

As an optimization of the structure of the present invention, a plurality of rectangular arrays of the heat energy recovery pipe fittings are distributed between the first flue gas plate and the second flue gas plate;

The distance between the adjacent radiating fins on the red copper tube is 0.5 cm.

As an optimization of the structure of the present invention, the end of the flue gas inlet pipe is connected to the flue gas outlet end of the desulfurization tower through a flange;

The smoke inlet pipe is connected to the lower end of the side wall of the first smoke plate, and the end of the smoke outlet pipe is connected to the smoke inlet end of the dehumidifier through a flange;

The smoke outlet pipe is communicated with the upper end of the side wall of the second smoke plate.

As a structural optimization of the present invention, the longitudinal cross-sectional shape of the cooling fins is circular.

As a structural optimization of the present invention, the flue gas heat energy recovery component is connected with two dehumidifiers; the dehumidifiers are connected in series;

The dehumidifier is communicated with two SCR denitration catalytic assemblies connected in series.

As an optimization of the structure of the present invention, the dehumidifier includes a dehumidification casing, and the dehumidification casing has a dehumidification liquid;

the dehumidification shell is sealed, and the dehumidification shell is provided with a smoke-scattering cage component;

The smoke-scattering cage part is connected to the smoke outlet pipe, and the smoke is scattered and dehumidified by the smoke-scattering cage part.

As an optimization of the structure of the present invention, the smoke scattering cage component includes a spiral smoke scattering pipe, and a plurality of smoke scattering spheres are connected to the spiral smoke scattering pipe, and the smoke scattering sphere is provided with a spherical cavity. A plurality of through holes are opened on the smoke scattering sphere.

As an optimization of the structure of the present invention, a plurality of through holes are opened on the spiral smoke-scattering pipe.

As an optimization of the structure of the present invention, the left and right sides of the dehumidifier are arranged at intervals;

The smoke outlet pipe runs through the dehumidification casing located on the left side, and the smoke outlet pipe is connected to the smoke inlet end of the spiral smoke diffuser pipe located on the left side;

The smoke outlet end of the spiral smoke scattering pipe located on the left side is connected with a through pipe, the through pipe penetrates the dehumidification shell located on the right side, and the through pipe is connected to the inlet of the spiral smoke scattering pipe located on the right side. For the smoke end, the top of the dehumidification shell located on the right side is provided with a smoke outlet end, and the smoke outlet end located at the top of the dehumidification shell on the right side is connected to the smoke inlet end of the SCR denitration catalytic assembly through a pipeline.

As an optimization of the structure of the present invention, the SCR denitration catalyst assembly includes an SCR denitration catalyst and a housing for assembling the SCR denitration catalyst;

The flue gas outlet end at the top of the dehumidification shell is connected to the SCR denitration catalyst through a pipeline.

Compared with the prior art, the present invention has the following advantages:

Through the design of the flue gas heat energy recovery component, the heat energy recovery box and the heat energy recovery components arranged in the heat energy recovery box are specifically adopted, and the second flue gas plate, the first flue gas plate, the first flue gas plate and the first Several heat energy recovery pipe fittings are communicated between the gas plate and the second flue gas plate. Specifically, a red copper tube is used, and the red copper tube is fixedly connected with a number of radiating fins arranged at intervals at the front and the rear, and the adjacent radiating fins are connected. The distance is 0.5cm, so that the high-temperature flue gas enters the first flue gas plate from the flue gas inlet pipe, and is divided into each heat energy recovery pipe fitting, and the cold water enters from the low temperature water inlet pipe. At this time, the heat energy recovery part is immersed in the In the cold water, at this time, the high temperature flue gas exchanges heat with the cold water through the copper tube and with the cold water through the cooling fins. After the cold water is heated, it is discharged from the high temperature water outlet pipe to realize the recovery and utilization of heat energy.

The use of the above device components effectively realizes the heat recovery of the high temperature flue gas.

Through the design of the dehumidifier, the dehumidification shell and the smoke-scattering cage parts are specifically used, and the smoke-scattering cage parts are used to realize the diffusion of the flue gas. The smoke-scattering cage component specifically adopts a spiral smoke-scattering pipe, a connected smoke-scattering sphere, a plurality of through holes on the smoke-scattering sphere, and a plurality of through-holes on the spiral smoke-scattering pipe. The spiral smoke diffuser adopts a spiral design. At the same time, the through-hole design on the smoke diffuser improves the dispersion of the flue gas, thereby increasing the dispersing surface of the flue gas and increasing the area of the flue gas contacting the desiccant, so as to fully dry the flue gas.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification, and are used to explain the present invention together with the embodiments of the present invention, and do not constitute a limitation to the present invention.

In the attached image:

Fig. 1 is a schematic flow chart of an embodiment of the present invention;

2 is a schematic diagram of a dispersion structure of a flue gas heat energy recovery assembly in an embodiment of the present invention;

3 is a schematic structural diagram of a thermal energy recovery component in an embodiment of the present invention;

Fig. 4 is the top view in Fig. 3 of the embodiment of the present invention;

FIG. 5 is a schematic structural diagram under another viewing angle in FIG. 3 according to the embodiment of the present invention;

Fig. 6 is the structural schematic diagram of the part of the smoke scattering cage in Fig. 3 according to the embodiment of the present invention;

Fig. 7 is the top view in Fig. 6 of the embodiment of the present invention;

FIG. 8 is a schematic structural diagram of FIG. 2 from another viewing angle according to the embodiment of the present invention.

Detailed ways

The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and provides a detailed implementation manner and a specific operation process, but the protection scope of the present invention is not limited to the following implementation. example.

Example 1

As shown in Figures 1-8, an integrated device for dry desulfurization, denitrification and purification of kiln flue gas includes a desulfurization tower 1, and the desulfurization tower 1 is connected with a flue gas heat energy recovery component 2. The flue gas heat energy recovery component 2 is connected with several dehumidifiers 3 ; the dehumidifier 3 is connected with several SCR denitration catalyst components 4 , and the SCR denitration catalyst component 4 is connected with a chimney 5 . Specifically, after the flue gas is desulfurized by the desulfurization tower 1, the heat energy in the flue gas is recovered by the flue gas heat energy recovery component 2, and the flue gas is dried by the dehumidifier 3 to avoid a large amount of "smoky rain" in the process of discharging the flue gas. .

The specific structure of the flue gas heat energy recovery assembly 2 is as follows:

The flue gas heat energy recovery assembly 2 includes a heat energy recovery box 22, the top of the heat recovery box 22 is connected with a high temperature water outlet pipe 221, and the bottom of the heat energy recovery box 22 is connected with a low temperature water inlet pipe. The thermal energy recovery box 22 is provided with a thermal energy recovery cavity, and the thermal energy recovery cavity is provided with a thermal energy recovery component 21; the thermal energy recovery component 21 realizes thermal energy recovery.

The specific structure of the heat energy recovery component 21 is as follows:

The heat energy recovery part 21 includes a second fume plate 212 and a first fume plate 211 arranged at intervals in the front and the rear. The first fume plate 211 and the second fume plate 212 are both provided with a fume cavity. Several heat energy recovery pipe fittings 213 are connected between the first flue gas plate 211 and the second flue gas plate 212 (a rectangular array of the heat energy recovery pipe fittings 213 is distributed on the first flue gas plate 211 and the second flue gas plate 213 . 212), the heat energy recovery pipe fittings 213 all include red copper tubes 2131, on which are fixedly connected a number of cooling fins 2132 arranged at intervals in the front and rear (each copper tube 2131 is adjacent to the The distance between the heat dissipation fins 2132 is 0.5cm, and the longitudinal cross-sectional shape of the heat dissipation fins 2132 is circular). The heat dissipation fins 2132 have inner and outer ends. The end is located in the lumen of the red copper tube 2131, and the outer end of the heat dissipation fin 2132 is located outside the red copper tube 2131; It runs through the lower end of the rear side wall of the heat energy recovery box 22, and is connected to the smoke outlet end of the desulfurization tower 1 through a flange), the second flue gas plate 212 is connected with a smoke outlet pipe 2121; the smoke inlet pipe 2111 is connected to the desulfurization tower. At the smoke outlet end of the tower 1 , the smoke outlet pipe 2121 is connected to the smoke inlet end of the dehumidifier 3 .

Specifically, the smoke inlet pipe 2111 is connected to the lower end of the side wall of the first smoke plate 211, the end of the smoke outlet pipe 2121 is connected to the smoke inlet end of the dehumidifier 3 through a flange; the smoke outlet pipe 2121 is connected to the The upper ends of the side walls of the second flue gas panels 212 .

The high temperature flue gas enters the first flue gas plate 211 from the flue gas inlet pipe 2111, and is divided into each heat energy recovery pipe fitting 213, and the cold water enters through the low temperature water inlet pipe. At this time, the high-temperature flue gas exchanges heat with the cold water through the red copper tube 2131 and with the cold water through the heat dissipation fins 2132 . After the cold water is heated, it is discharged from the high-temperature water outlet pipe 221 to realize the recovery and utilization of thermal energy.

The advantages of using the above device component design are:

Through the design of the flue gas heat energy recovery assembly 2, the heat energy recovery box 22 and the heat energy recovery component 21 arranged in the heat energy recovery box 22 are specifically adopted, and the second flue gas plate 212 and the first flue gas plate which are arranged at intervals between the front and the rear are specifically adopted. 211. Several heat energy recovery pipe fittings 213 are communicated between the first flue gas plate 211 and the second flue gas plate 212. Specifically, the red copper pipe 2131 and the red copper pipe 2131 are fixedly connected with a number of front and rear spaced apart. The distance between the radiating fins 2132 and the adjacent radiating fins 2132 is 0.5cm, so that the high-temperature flue gas enters the first flue gas plate 211 from the flue gas inlet pipe 2111, and is divided into each heat energy recovery pipe fitting 213, The cold water enters from the low temperature water inlet pipe. At this time, the heat energy recovery component 21 is immersed in the cold water. At this time, the high temperature flue gas exchanges heat with the cold water through the copper pipe 2131 and with the cold water through the cooling fins 2132. After the cold water is heated, it is discharged from the high-temperature water outlet pipe 221 to realize the recovery and utilization of thermal energy.

The use of the above device components effectively realizes the heat recovery of the high temperature flue gas.

Example 2

As shown in Figures 1-8, in this embodiment, on the basis of the structure of Embodiment 1, the flue gas heat energy recovery assembly 2 is connected with two dehumidifiers 3; the dehumidifiers 3 are connected in series; the dehumidifiers 3 are connected with Two SCR denitration catalytic assemblies 4 connected in series.

It is realized that the flue gas after heat energy recovery passes through the dehumidifier 3 for secondary dehumidification, and passes through the SCR denitration catalytic component 4 for secondary denitration treatment.

Among them, the SCR denitration catalytic assembly 4 is a conventional SCR denitration catalytic device disclosed in the prior art. Its main structure includes an SCR denitration catalyst and a casing equipped with the SCR denitration catalyst. The flue gas enters the casing and is realized by including the SCR denitration catalyst. Catalytic denitration to reduce nitrogen oxides in flue gas.

Example 3

As shown in FIGS. 1-8 , in this embodiment, on the basis of the structure of Embodiment 2, the dehumidifier 3 is designed as follows to dehumidify.

The dehumidifier 3 includes a dehumidification shell, and the dehumidification shell has a dehumidification liquid. Specifically, the dehumidification liquid is dehumidified by, for example, saturated calcium chloride or saturated calcium carbonate solution.

The dehumidification casing is sealed, and the dehumidification casing is provided with a smoke-scattering cage member 31, through which the smoke is diffused, and the drying effect of the smoke is improved by diffusing the smoke.

The smoke scattering cage component 31 includes a spiral smoke scattering pipe 311, and a plurality of smoke scattering spheres 312 are communicated with the spiral smoke scattering pipe 311. The smoke scattering sphere 312 is provided with a spherical cavity, and the smoke scattering sphere 312 is provided with several through holes. Several through holes are formed on the spiral smoke-scattering pipe 311 .

The spiral smoke-scattering pipe 311 adopts a spiral design. At the same time, the through-hole design on the smoke-scattering sphere 312 improves the dispersion of the flue gas, thereby increasing the dispersing surface of the flue gas and increasing the area of the flue gas contacting the desiccant, so as to achieve sufficient drying of the smoke. gas.

Since the left and right sides of the dehumidifier 3 are arranged at intervals, the connection method is as follows:

The smoke outlet duct 2121 runs through the dehumidification casing on the left side, and the smoke outlet duct 2121 is connected to the smoke inlet end of the spiral smoke diffuser pipe 311 on the left side (the smoke inlet end of the spiral smoke diffuser pipe 311 is connected with a suitable the pipeline a).

The smoke outlet end of the spiral smoke scattering pipe 311 on the left side is communicated with a through pipe b, and the through pipe b runs through the dehumidification shell located on the right side. The pipe a (the smoke inlet end of the spiral smoke scattering pipe 311 is connected to There is a suitable pipe a) connected to the pipe a on the smoke inlet end of the spiral smoke diffuser pipe 311 located on the right side, and the top of the dehumidification shell located on the right side is provided with a smoke outlet end, located on the right side. The smoke outlet end of the top of the dehumidification shell is connected to the smoke inlet end of the SCR denitration catalytic assembly 4 through a through pipe.

The advantages of using the above device component design are:

By designing the dehumidifier 3, the dehumidification shell and the smoke-scattering cage part 31 are specifically adopted, and the smoke-scattering cage part 31 is used to realize the diffusion of the flue gas. The smoke scattering cage member 31 specifically adopts a spiral smoke scattering pipe 311 , a connected smoke scattering ball 312 , a plurality of through holes are formed on the smoke scattering ball 312 , and a plurality of through holes are formed on the spiral smoke scattering pipe 311 . The spiral smoke-scattering pipe 311 adopts a spiral design. At the same time, the through-hole design on the smoke-scattering sphere 312 improves the dispersion of the flue gas, thereby increasing the dispersing surface of the flue gas and increasing the area of the flue gas contacting the desiccant, so as to achieve sufficient drying of the smoke. gas.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (9)

1. A kiln flue gas dry desulfurization, denitrification and purification integrated device is characterized in that, comprising a desulfurization tower, and the desulfurization tower is communicated with a flue gas heat energy recovery assembly; The flue gas heat energy recovery component is connected with a number of dehumidifiers; the dehumidifier is connected with a number of SCR denitration catalytic components, and the SCR denitration catalytic component is connected with a chimney; The flue gas heat energy recovery assembly includes a heat energy recovery box, the top of the heat recovery box is connected with a high temperature water outlet pipe, and the bottom of the heat energy recovery box is connected with a low temperature water inlet pipe; A thermal energy recovery cavity is arranged in the thermal energy recovery box, and a thermal energy recovery component is arranged in the thermal energy recovery cavity; The heat energy recovery component includes a second smoke plate and a first smoke plate arranged at intervals in the front and the rear, and a smoke cavity is arranged in the first smoke plate and the second smoke plate, and the first smoke plate is provided with a smoke cavity. A number of heat energy recovery pipe fittings are communicated between the gas plate and the second flue gas plate, and the heat energy recovery pipe fittings all include red copper tubes. The radiating fin has an inner end and an outer end, the inner end of the radiating fin is located in the tube cavity of the red copper tube, and the outer end of the radiating fin is located outside the red copper tube; The first flue gas plate is communicated with a smoke inlet pipe, and the second flue gas plate is communicated with a smoke outlet pipe; The smoke inlet pipe is connected to the smoke outlet end of the desulfurization tower, and the smoke outlet pipe is connected to the smoke inlet end of the dehumidifier. 2 . The integrated device for dry desulfurization, denitration and purification of kiln flue gas according to claim 1 , wherein a plurality of the heat energy recovery pipe fittings are distributed in a rectangular array between the first flue gas plate and the second flue gas plate. 3 . ; The distance between the adjacent radiating fins on the red copper tube is 0.5 cm. 3. The integrated device for dry-process desulfurization, denitrification and purification of kiln flue gas according to claim 2, wherein the end of the flue gas inlet pipe is connected to the exhaust end of the desulfurization tower through a flange; The smoke inlet pipe is connected to the lower end of the side wall of the first smoke plate, and the end of the smoke outlet pipe is connected to the smoke inlet end of the dehumidifier through a flange; The smoke outlet pipe is communicated with the upper end of the side wall of the second smoke plate. 4 . The integrated device for dry desulfurization, denitration and purification of kiln flue gas according to claim 3 , wherein the longitudinal cross-sectional shape of the cooling fins is circular. 5 . 5. The integrated device for dry desulfurization, denitration and purification of kiln flue gas according to claim 4, wherein the flue gas heat energy recovery component is connected with two dehumidifiers; the dehumidifiers are connected in series; The dehumidifier is communicated with two SCR denitration catalytic assemblies connected in series. 6 . The integrated device for dry desulfurization, denitrification and purification of kiln flue gas according to claim 5 , wherein the dehumidifier comprises a dehumidification shell, and the dehumidification shell has a dehumidification liquid in the dehumidifier; 7 . the dehumidification shell is sealed, and the dehumidification shell is provided with a smoke-scattering cage component; The smoke scattering cage part is connected to the smoke outlet pipe, and the smoke is scattered and dehumidified through the smoke scattering cage part; The smoke-scattering cage component includes a spiral smoke-scattering pipe, and a plurality of smoke-scattering spheres are connected to the spiral smoke-scattering pipe, the smoke-scattering sphere is provided with a spherical cavity, and a plurality of through holes are opened on the smoke-scattering sphere. . 7 . The integrated device for dry desulfurization, denitrification and purification of kiln flue gas according to claim 6 , wherein a plurality of through holes are opened on the spiral smoke dispersion pipe. 8 . 8. The integrated device for dry desulfurization, denitration and purification of kiln flue gas according to claim 6, characterized in that the dehumidifier is arranged at intervals on the left and right sides; The smoke outlet pipe runs through the dehumidification casing located on the left side, and the smoke outlet pipe is connected to the smoke inlet end of the spiral smoke diffuser pipe located on the left side; The smoke outlet end of the spiral smoke scattering pipe located on the left side is connected with a through pipe, the through pipe penetrates the dehumidification shell located on the right side, and the through pipe is connected to the inlet of the spiral smoke scattering pipe located on the right side. The smoke end is located on the right side of the dehumidification shell with a smoke outlet end, and the smoke outlet end located on the right side of the dehumidification shell top is connected to the smoke inlet end of the SCR denitration catalytic assembly through a pipeline. 9 . The integrated device for dry desulfurization, denitration and purification of kiln flue gas according to claim 8 , wherein the SCR denitration catalytic assembly comprises an SCR denitration catalyst and a housing equipped with the SCR denitration catalyst; 10 . The flue gas outlet end at the top of the dehumidification shell is connected to the SCR denitration catalyst through a pipeline.

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