Grate-rotary kiln flue gas desulfurization, denitrification and dust removal process package combined device

Abstract

The utility model discloses a chain grate-rotary kiln flue gas desulfurization, denitrification and dust removal process package combined device which comprises a chain grate, a rotary kiln and a circular cooler, the chain grate comprises a forced air drying section, an air draft drying section, a first preheating section and a second preheating section, and the circular cooler comprises a first circular cooler section, a second circular cooler section and a third circular cooler section. An upper air bellow outlet of the forced air drying section, a bottom air bellow outlet of the induced draft drying section and a bottom air bellow outlet of the first preheating section are connected to a main air pipe, the main air pipe is connected to a dust remover, the dust remover is connected to a denitration tower, and the denitration tower is connected to a desulfurization tower. Normal work of the chain grate machine, the rotary kiln and the circular cooler on pellet production is guaranteed, high-temperature flue gas is cooled through heat exchange and used for heating desulfurization slurry and water, the preheated desulfurization slurry improves the desulfurization effect, the heated water is further treated to form steam used for spraying a denitration agent, the denitration effect is guaranteed, and energy saving is integrally achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment, in particular to a chain grate machine-rotary kiln flue gas desulfurization, denitrification and dust removal process package combined device. Background Art

[0002] The existing utility model patent with patent number 202022030516.4 discloses a stable and efficient chain grate-rotary kiln flue gas desulfurization, denitrification and dust removal device that can meet ultra-low emission requirements. It realizes coordinated denitrification by arranging two groups of denitrification devices. However, the denitrification device is arranged between the rotary kiln and the second preheating stage, and there is a problem that the pellets are affected by the denitrification structure when entering the rotary kiln in the second preheating stage; on the other hand, the flue gas discharged from the first preheating stage directly enters the dust collector, and due to the high temperature of the flue gas, it is also easy to affect the service life of the dust collector. Utility Model Content

[0003] The purpose of the utility model is to provide a chain grate-rotary kiln flue gas desulfurization, denitrification and dust removal process package combination device which ensures normal pellet production and realizes energy saving and high efficiency in view of the deficiencies in the above-mentioned background technology.

[0004] In order to achieve the above purpose, the utility model discloses a chain grate machine-rotary kiln flue gas desulfurization, denitrification and dust removal process package combined device, which adopts the following technical solutions:

[0005] A chain grate-rotary kiln flue gas desulfurization, denitrification and dust removal process package combined device, including a chain grate, a rotary kiln and an annular cooler, the chain grate includes a blast drying section, an exhaust drying section, a preheating section one and a preheating section two, the annular cooler includes an annular cooling section one, an annular cooling section two and an annular cooling section three, the annular cooling section one air outlet is connected to the rotary kiln, the rotary kiln is connected to the preheating section two, the annular cooling section two air outlet is connected to the preheating section one, the annular cooling section three air outlet is connected to the blast drying section, the bottom bellows outlet of the preheating section two is connected to the preheating section one, and the bottom bellows outlet of the preheating section two is connected to the preheating section one. The reheating fan is connected to the upper bellows of the exhaust drying section, the upper bellows outlet of the blast drying section, the bottom bellows outlet of the exhaust drying section, and the bottom bellows outlet of the preheating section are connected to the main air duct, the main air duct is connected to the dust collector, the dust collector is connected to the denitrification tower, the denitrification tower is connected to the desulfurization tower, the main air duct also passes through the cooling zone, the cooling zone includes a cooling pool and a desulfurization slurry pool, the cooling pool and the desulfurization slurry pool are respectively provided with heat exchange pipes, and the heat exchange pipes are connected to the main air duct.

[0006] The utility model discloses a chain grate machine-rotary kiln flue gas desulfurization, denitration and dust removal process package combined device, wherein the cooling zone is arranged at a side of the connection between the blast drying section and the main air duct away from the dust collector.

[0007] The utility model provides a chain grate machine-rotary kiln flue gas desulfurization, denitrification and dust removal process package combined device, wherein an auxiliary connecting pipe is provided on the connecting pipe between the bottom bellows outlet of the second preheating stage and the upper bellows of the exhaust drying stage, and the auxiliary connecting pipe passes through the second cooling zone.

[0008] The utility model discloses a chain grate machine-rotary kiln flue gas desulfurization, denitration and dust removal process package combined device, and the further improvement lies in that a valve is arranged on the auxiliary connecting pipe.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] The utility model ensures the normal operation of the chain grate machine, rotary kiln and ring cooler for pellet production. At the same time, the discharged high-temperature flue gas is cooled and then enters the dust collector, denitrification tower and desulfurization tower to ensure the service life. The high-temperature flue gas is cooled by heat exchange and used to heat the desulfurization slurry and water. The preheated desulfurization slurry improves the desulfurization effect. The heated water is further processed to form steam for the injection of the denitrification agent, thereby ensuring the denitrification effect and achieving energy saving as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] In the figure: 1 rotary kiln, 2 forced air drying section, 3 exhaust air drying section, 4 preheating section 1, 5 preheating section 2, 6 ring cooling section 1, 7 ring cooling section 2, 8 ring cooling section 3, 9 main air duct, 10 dust collector, 11 denitrification tower, 12 desulfurization tower, 13 cooling zone, 14 auxiliary connecting pipe. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0014] like Figure 1As shown, a chain grate-rotary kiln flue gas desulfurization, denitrification and dust removal process package combination device includes a chain grate, a rotary kiln 1 and a ring cooler, the chain grate includes a blast drying section 2, an exhaust drying section 3, a preheating section 1 4 and a preheating section 2 5, the ring cooler includes a ring cooling section 1 6, a ring cooling section 2 7 and a ring cooling section 3 8, the air outlet of the ring cooling section 1 is connected to the rotary kiln, the rotary kiln is connected to the preheating section 2, the air outlet of the ring cooling section 2 is connected to the preheating section 1, the air outlet of the ring cooling section 3 is connected to the blast drying section, the bottom bellows outlet of the preheating section 2 is connected to the upper bellows of the exhaust drying section through a reheating fan, the upper bellows outlet of the blast drying section, the bottom bellows outlet of the exhaust drying section and the bottom bellows outlet of the preheating section 1 are connected to the main air duct 9, the main air duct is connected to the dust collector 10, and the dust collector can be a bag dust collector. The dust collector is connected to the denitrification tower 11, which is connected to the desulfurization tower 12. The main air duct also passes through the cooling area 13, which includes a cooling pool and a desulfurization slurry pool. The cooling pool and the desulfurization slurry pool are respectively provided with heat exchange pipes, which are connected to the main air duct. The cooling pool contains water. The desulfurization slurry pool is connected to the slurry spraying structure of the desulfurization tower. After the water in the cooling pool is heat exchanged, it is heated to form steam for the injection of the denitrification agent.

[0015] The cooling zone is arranged at the side of the connection between the blast drying section and the main air duct away from the dust collector.

[0016] An auxiliary connecting pipe 14 is also provided on the connecting pipe between the bottom wind box outlet of the second preheating stage and the upper wind box of the exhaust drying stage. The auxiliary connecting pipe passes through the second cooling zone (not shown in the figure), which can be a water pool. A valve is provided on the auxiliary connecting pipe. The auxiliary connecting pipe is used to further adjust the temperature entering the exhaust drying stage, which improves the applicability.

[0017] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A chain grate-rotary kiln flue gas desulfurization, denitrification and dust removal process package combined device, characterized in that: It includes a chain grate machine, a rotary kiln and an annular cooler. The chain grate machine includes a blast drying section, an exhaust drying section, a preheating section one and a preheating section two. The annular cooler includes an annular cooling section one, an annular cooling section two and an annular cooling section three. The air outlet of the annular cooling section one is connected to the rotary kiln, the rotary kiln is connected to the preheating section two, the air outlet of the annular cooling section two is connected to the preheating section one, and the air outlet of the annular cooling section three is connected to the blast drying section. The bottom bellows outlet of the preheating section two is connected to the upper bellows of the exhaust drying section through a heat recovery fan. The upper bellows outlet of the blast drying section, the bottom bellows outlet of the exhaust drying section and the bottom bellows outlet of the preheating section one are connected to the main air duct. The main air duct is connected to a dust collector. The dust collector is connected to a denitrification tower. The denitrification tower is connected to a desulfurization tower. The main air duct also passes through a cooling zone. The cooling zone includes a cooling pool and a desulfurization slurry pool. Heat exchange pipes are respectively arranged in the cooling pool and the desulfurization slurry pool, and the heat exchange pipes are connected to the main air duct.

2. The chain grate-rotary kiln flue gas desulfurization, denitrification and dust removal process package combined device according to claim 1, characterized in that: The cooling zone is arranged at a side of the connection between the blast drying section and the main air duct away from the dust collector.

3. The chain grate-rotary kiln flue gas desulfurization, denitrification and dust removal process package combined device according to claim 2, characterized in that: An auxiliary connecting pipe is also provided on the connecting pipe between the bottom wind box outlet of the second preheating stage and the upper wind box of the exhaust drying stage, and the auxiliary connecting pipe passes through the second cooling zone.

4. The chain grate-rotary kiln flue gas desulfurization, denitrification and dust removal process package combined device according to claim 3, characterized in that: The auxiliary connecting pipe is provided with a valve.

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