Municipal sludge incineration flue gas system for increasing flue gas temperature of bag-type dust collector

Abstract

The utility model belongs to the technical field of flue gas treatment, and particularly discloses a municipal sludge incineration flue gas system for increasing the flue gas temperature of a bag-type dust collector, which comprises an incineration kiln and a secondary combustion chamber connected with the incineration kiln, and the secondary combustion chamber is sequentially connected with a spray drying tower, a cyclone dust collector and the bag-type dust collector through a main pipe. A branch pipe is connected to the main pipe between the secondary combustion chamber and the spray drying tower, the other end of the branch pipe is connected to the main pipe between the cyclone dust collector and the bag-type dust collector, a heat exchanger is arranged on the branch pipe and used for reducing the flue gas temperature, and a first valve is arranged on the branch pipe between the heat exchanger and the secondary combustion chamber; compared with an incineration flue gas system in the prior art, the sludge incineration flue gas system has the advantages that the inlet temperature of the bag-type dust collector can be increased, the moisture content of flue gas can be reduced, the bag pasting phenomenon of the bag-type dust collector is avoided, and the stable pressure difference between the inlet and the outlet of a bag is ensured, so that the incineration efficiency of an incineration kiln is improved, and the energy consumption of a fan is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to flue gas treatment technical field especially a municipal sludge incineration flue gas system for improving cloth bag dust collector flue gas temperature. BACKGROUND

[0002] Sludge incineration is a kind of process for treating municipal sludge, which uses incinerator to heat and dry dewatered sludge, and then oxidizes organic matters in sludge at high temperature to make sludge into a small amount of ash.

[0003] REFERENCE Figure 1 and Figure 2 The current municipal sludge incineration system comprises an incinerator (1) and a secondary combustion chamber (2) connected with the incinerator (1), and the secondary combustion chamber (2) is connected with a spray drying tower (3), a cyclone dust collector (4) and a cloth bag dust collector (5) in sequence through a main pipe (6). The moisture content of municipal sludge before treatment is 80%, and the municipal sludge is first atomized by a sludge spray gun in the spray drying tower (3) and then contacts high-temperature flue gas (about 550 DEG C) from the secondary combustion chamber (2), so as to be dried and formed into powder. The moisture content of the dried municipal sludge is about 25%, and the dried municipal sludge is sent into the incinerator (1) by a screw conveyor for incineration.

[0004] However, when the municipal sludge treatment capacity increases, for example, the load of the sludge spray gun is increased to 10 m 3 / h, the outlet temperature of the spray drying tower (3) will decrease due to the high moisture content of the municipal sludge, even if the inlet temperature of the spray drying tower (3) reaches 650 DEG C, the temperature of the spray drying tower (3) will not increase, so that the moisture content in the flue gas increases. After the moisture content in the flue gas increases, the dust on the surface of the cloth bag dust collector (5) will become damp, which causes the cloth bag to be pasted, the surface of the cloth bag of the cloth bag dust collector (5) is too wet, the flue gas cannot pass through the cloth bag, which causes the pressure difference between the inlet and outlet of the cloth bag to increase, so that the incineration efficiency of the incinerator is reduced, and the energy consumption of the fan is also increased. INVENTION CONTENTS

[0005] In view of the technical problem that the municipal sludge treatment capacity increases, the cloth bag of the cloth bag dust collector is pasted, and the incineration efficiency of the incinerator is reduced and the energy consumption of the fan is increased, the utility model provides a municipal sludge incineration flue gas system for increasing the flue gas temperature of the cloth bag dust collector.

[0006] The utility model adopts the technical scheme: municipal sludge incineration flue gas system for improving cloth bag dust catcher flue gas temperature includes incineration kiln and with the two combustion chamber of incineration kiln, two combustion chambers are connected spray drying tower, cyclone dust collector and cloth bag dust catcher in proper order through main pipe, and the main pipe between two combustion chambers is connected with branch pipe, and the other end of branch pipe is connected on the main pipe between cyclone dust collector and cloth bag dust catcher, be provided with heat exchanger on branch pipe, heat exchanger is used to reduce flue gas temperature, be provided with first valve on the branch pipe between heat exchanger and two combustion chambers, be provided with fan on the branch pipe between heat exchanger and cloth bag dust catcher.

[0007] Further, the branch pipe between the fan and the cloth bag dust collector is communicated with a lime pipeline, and the lime pipeline is used for spraying dry lime into the branch pipe.

[0008] Further, the surface of the branch pipe is wrapped with heat insulation cotton.

[0009] Further, the heat exchanger is a water-cooled heat exchanger.

[0010] Further, the first valve is an electric regulating valve.

[0011] Further, the fan is a variable frequency fan.

[0012] Further, a second valve is arranged on the branch pipe between the fan and the heat exchanger.

[0013] Further, the second valve is an electric regulating valve.

[0014] Further, a third valve is arranged on the branch pipe between the fan and the lime pipeline.

[0015] Further, the third valve is an electric regulating valve.

[0016] The utility model has the advantages of:

[0017] 1. The utility model discloses a branch pipe, which can improve the inlet temperature of the cloth bag dust collector, reduce the moisture content of flue gas, avoid the phenomenon of bag sticking of the cloth bag dust collector, ensure the stability of the pressure difference between the inlet and outlet of the cloth bag, and improve the incineration efficiency of the incineration kiln and reduce the energy consumption of the fan.

[0018] 2. The utility model discloses that dry lime is sprayed into the main pipe, thereby adsorbing the moisture in the flue gas, further reducing the moisture content of the flue gas, avoiding the phenomenon of bag sticking of the cloth bag dust collector, and improving the incineration efficiency of the incineration kiln. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a plan view of the prior art municipal sludge incineration system.

[0020] Figure 2It is a front view of the prior art municipal sludge incineration system.

[0021] Figure 3 It is a plan view of the municipal sludge incineration flue gas system of the utility model.

[0022] Marked as in the figure:

[0023] 1, incineration kiln; 2, secondary combustion chamber; 3, spray drying tower; 4, cyclone dust collector; 5, bag-type dust collector; 6, main pipe;

[0024] 7, branch pipe; 701, heat exchanger; 702, first valve; 703, fan; 704, second valve; 705, third valve;

[0025] 8, lime pipeline. DETAILED DESCRIPTION

[0026] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "front", "upper", "lower", "left", "right", "vertical", "horizontal" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0027] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0028] The following will be combined with the drawings Figure 3 Further illustrate the utility model.

[0029] Example one

[0030] In view of the technical problems in the background art, the utility model provides a municipal sludge incineration flue gas system for improving the flue gas temperature of a bag-type dust collector.

[0031] In the specific technical solution, referring to Figure 3 The municipal sludge incineration flue gas system comprises an incineration kiln 1 and a secondary combustion chamber 2 connected with the incineration kiln 1, and the secondary combustion chamber 2 is sequentially connected with a spray drying tower 3, a cyclone dust collector 4 and a bag-type dust collector 5 through a main pipe 6.

[0032] The structure is same as the municipal sludge incineration flue gas system in the prior art, but when the municipal sludge treatment capacity increases, the bag filter will be clogged, and the incineration efficiency of the incinerator is reduced and the energy consumption of the fan is increased.

[0033] To this end, the embodiment is improved as follows: Figure 3 The embodiment is connected with a branch pipe 7 between the main pipe 6 between the secondary combustion chamber 2 and the spray drying tower 3, and the branch pipe 7 is connected to the main pipe 6 between the cyclone dust collector 4 and the bag filter 5, a heat exchanger 701 is arranged on the branch pipe 7, the heat exchanger 701 is used to reduce the temperature of the flue gas, a first valve 702 is arranged on the branch pipe 7 between the heat exchanger 701 and the secondary combustion chamber 2, and a fan 703 is arranged on the branch pipe 7 between the heat exchanger 701 and the bag filter 5, the first valve 702 is an electric regulating valve, and the fan 703 is a variable frequency fan.

[0034] Working principle: the embodiment draws a branch pipe 7 from the main pipe 6 between the secondary combustion chamber 2 and the spray drying tower 3, and connects the branch pipe 7 to the main pipe 6 between the cyclone dust collector 4 and the bag filter 5, that is, the inlet of the bag filter 5, so as to improve the inlet temperature of the bag filter. The temperature in the main pipe 6 between the secondary combustion chamber 2 and the spray drying tower 3 is about 650 DEG C, and the optimal working temperature range of the bag filter 5 is 150 DEG C to 160 DEG C, so the embodiment is provided with a heat exchanger 701 on the branch pipe 7, the heat exchanger reduces the high-temperature flue gas at about 650 DEG C to 150 DEG C to 160 DEG C and then sends the flue gas to the bag filter 5, so that the bag filter 5 is in the optimal working condition.

[0035] From the above structure and working principle, compared with the municipal sludge incineration flue gas system in the prior art, the embodiment can improve the inlet temperature of the bag filter, reduce the water content of the flue gas, avoid the phenomenon of clogging of the bag filter, ensure the stability of the pressure difference between the inlet and outlet of the bag, and improve the incineration efficiency of the incineration kiln and reduce the energy consumption of the fan.

[0036] The embodiment is further provided with a second valve 704 on the branch pipe 7 between the fan 703 and the heat exchanger 701, the second valve 704 is an electric regulating valve, and the maintenance of the related equipment is facilitated.

[0037] Embodiment two

[0038] To further reduce the water content in the flue gas, referring to Figure 3On the basis of the first embodiment, the embodiment further comprises a lime pipe 8 communicated with the branch pipe 7 between the fan 703 and the bag-type dust collector 5, and the lime pipe 8 is used for spraying dry lime into the branch pipe 7. A spray gun is arranged at the end of the lime pipe 8 extending into the branch pipe 7, and the dry lime is sprayed into the branch pipe 7 through the spray gun. The dry lime is in powder form, and the dry lime flowing into the branch pipe 7 flows to the main pipe 6 along with the branch pipe 7, and can absorb the moisture in the flue gas flowing to the bag-type dust collector 5 along with the main pipe 6, so as to further reduce the moisture content of the flue gas and avoid the bag-type dust collector from being pasted.

[0039] The embodiment further comprises heat insulation cotton wrapped on the surface of the branch pipe 7, and the heat insulation cotton can play a heat insulation effect, reduce heat loss, and more importantly, avoid scalding the workers.

[0040] The heat exchanger 701 in the embodiment is a water-cooled heat exchanger. The incineration power plant is generally provided with many heat exchangers, such as boilers, and the plant is provided with industrial circulating cooling water. The heat exchanger 701 is selected as a water-cooled heat exchanger, so that the existing resources can be used, and the arrangement is simple and reliable.

[0041] The embodiment further comprises a third valve 705 arranged on the branch pipe 7 between the fan 703 and the lime pipe 8, and the third valve 705 is an electric regulating valve, so as to facilitate the maintenance of the related equipment.

[0042] The above detailed description is used for further detailing the purpose, technical scheme and beneficial effects of the utility model, and it should be understood that the above description is only the specific implementation manner of the utility model, and is not used for limiting the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A municipal sludge incineration flue gas system for increasing the flue gas temperature of a bag filter, comprising an incineration kiln (1) and a secondary combustion chamber (2) connected to the incineration kiln (1), the secondary combustion chamber (2) being connected in sequence to a spray drying tower (3), a cyclone (4) and a bag filter (5) by a main pipe (6), characterized in that, The branch pipe (7) is connected to the main pipe (6) between the secondary combustion chamber (2) and the spray drying tower (3), and the other end of the branch pipe (7) is connected to the main pipe (6) between the cyclone dust collector (4) and the bag-type dust collector (5), a heat exchanger (701) is arranged on the branch pipe (7), the heat exchanger (701) is used for reducing the temperature of flue gas, a first valve (702) is arranged on the branch pipe (7) between the heat exchanger (701) and the secondary combustion chamber (2), and a fan (703) is arranged on the branch pipe (7) between the heat exchanger (701) and the bag-type dust collector (5).

2. The municipal sludge incineration flue gas system for increasing the flue gas temperature of a baghouse, as claimed in claim 1, wherein, The branch pipe (7) between the fan (703) and the bag-type dust collector (5) is communicated with a lime pipeline (8), and the lime pipeline (8) is used for spraying dry lime into the branch pipe (7).

3. The municipal sludge incineration flue gas system for increasing the flue gas temperature of a baghouse, as claimed in claim 1, wherein, The surface of the branch pipe (7) is wrapped with heat insulation cotton.

4. The municipal sludge incineration flue gas system for increasing the flue gas temperature of a baghouse, as claimed in claim 1, wherein, The heat exchanger (701) is a water-cooled heat exchanger.

5. The municipal sludge incineration flue gas system for increasing the flue gas temperature of a baghouse, as claimed in claim 1, wherein, The first valve (702) is an electric regulating valve.

6. The municipal sludge incineration flue gas system for increasing the flue gas temperature of a baghouse, as claimed in claim 1, wherein, The fan (703) is a variable frequency fan.

7. The municipal sludge incineration flue gas system for increasing the flue gas temperature of a baghouse, as claimed in claim 1, wherein, A second valve (704) is arranged on the branch pipe (7) between the fan (703) and the heat exchanger (701).

8. The municipal sludge incineration flue gas system for increasing the flue gas temperature of a baghouse, as claimed in claim 7, wherein, The second valve (704) is an electric regulating valve.

9. The municipal sludge incineration flue gas system for increasing the flue gas temperature of a baghouse, as claimed in claim 1, wherein, A third valve (705) is arranged on the branch pipe (7) between the fan (703) and the lime pipeline (8).

10. The municipal sludge incineration flue gas system for increasing the flue gas temperature of a baghouse, as claimed in claim 9, wherein, The third valve (705) is an electric regulating valve.

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