Carbon black combustion tail gas boiler with in-boiler heat storage stable combustion device

Abstract

The utility model discloses a carbon black combustion tail gas boiler with an in-boiler heat storage stable combustion device, and belongs to the technical field of tail gas boiler devices. A carbon black tail gas burning boiler with an in-boiler heat storage stable burning device comprises a boiler body and further comprises a burner fixedly connected in the boiler body and used for burning carbon black tail gas fuel. The in-furnace heat storage stable combustion device is fixedly connected into the boiler, and the combustion flame is within the range of the in-furnace heat storage stable combustion device; the hearth heating surface is fixedly connected in the boiler; the utility model is provided with an in-furnace heat storage stable combustion device. The in-furnace heat storage stable combustion device mainly comprises a heat storage material, a refractory material, a heat preservation material and the like, the in-furnace heat storage stable combustion device has a heat storage function in a combustion flame range, the combustion efficiency can be enhanced, meanwhile, a sufficient radiation heating area is provided for the hearth membrane water cooling wall without laying the refractory material, and the heat absorption rate of the boiler hearth is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to tail gas boiler device technical field especially, it is a kind of carbon black tail gas boiler with in-furnace heat accumulation combustion stabilizer. BACKGROUND

[0002] Carbon black tail gas refers to the gas after carbon black is separated from carbon black flue gas, according to the relevant policy of state, it is not allowed to be directly discharged in atmosphere.Carbon black tail gas main component includes nitrogen oxide, carbon monoxide, volatile organic compound, particulate matter etc., in addition, it also contains carbon dioxide, oxygen, hydrogen, methane, nitrogen, hydrogen sulfide etc.

[0003] Therefore can be used as secondary energy recycling, carbon black tail gas as fuel uses when its calorific value is low, applied to industrial boiler needs to solve its stable combustion problem.Currently, the conventional design concept is to design adiabatic combustion chamber to improve its combustion efficiency.

[0004] But adiabatic combustion chamber in boiler long time operation due to its thermal expansion and contraction principle will exist the risk of falling or collapse, cause maintenance frequently or cause safety accident.

[0005] Therefore, a kind of carbon black tail gas boiler with in-furnace heat accumulation combustion stabilizer is provided to solve the problems proposed above. INVENTION CONTENTS

[0006] The utility model aims at solving the problems proposed in the above background art, and provides a carbon black tail gas boiler with in-furnace heat accumulation combustion stabilizer.

[0007] To achieve the above object, the utility model adopts the following technical scheme:

[0008] A carbon black tail gas boiler with in-furnace heat accumulation combustion stabilizer, comprising a boiler, further comprising:

[0009] A burner is fixedly connected in the boiler for burning carbon black tail gas fuel.

[0010] An in-furnace heat accumulation combustion stabilizer is fixedly connected in the boiler, and the combustion flame is within the range of the in-furnace heat accumulation combustion stabilizer.

[0011] A hearth heating surface is fixedly connected in the boiler, and the hearth heating surface is located above the in-furnace heat accumulation combustion stabilizer for absorbing radiant heat.

[0012] A convection heating surface is fixedly connected in the boiler, and the convection heating surface is used for convection heat exchange of the gas after absorbing radiant heat.

[0013] An SCR denitration interface device is fixedly connected in the boiler, and the SCR denitration interface device is used for denitrogenation treatment of the gas after convection heat exchange.

[0014] A high-temperature economizer is fixedly connected in the boiler and used for sucking the gas after denitration treatment;

[0015] An air preheater is fixedly connected in the boiler and connected with the gas outlet end of the high-temperature economizer, used for heat exchanging the gas discharged by the high-temperature economizer to obtain heated gas;

[0016] A low-temperature economizer is fixedly connected in the boiler and connected with the gas outlet end of the air preheater, and the gas discharged by the low-temperature economizer will be connected to the tail boiler auxiliary equipment.

[0017] Preferably, the boiler is provided with a convection heating surface between the furnace heating surface and the SCR denitration interface device.

[0018] Preferably, the convection heating surface is provided with a convection smoke partition wall, and the lower part of the convection smoke partition wall is provided with a dust falling device, the convection heating surface performs convection heat exchange on the gas, and then the smoke dust is separated by changing the smoke gas direction through the convection smoke partition wall and is collected through the dust falling device.

[0019] Preferably, the air preheater adopts a layout structure of middle air inlet and two-end air outlet communication, and the heated gas of the air preheater will enter the combustor.

[0020] Preferably, the combustor is obliquely installed on the furnace heating surface, and the center of the combustor is aligned with the center of the in-furnace heat accumulation and combustion stabilizing device.

[0021] Compared with the prior art, the charcoal tail gas boiler with the in-furnace heat accumulation and combustion stabilizing device has the following beneficial effects: Invention content

[0023] The in-furnace heat accumulation and combustion stabilizing device is provided, mainly containing heat accumulation materials, refractory materials and heat preservation materials, etc., the in-furnace heat accumulation and combustion stabilizing device has a heat accumulation function in the combustion flame range, can strengthen the combustion efficiency, and the furnace membrane water cooling wall does not need to be provided with refractory materials to provide sufficient radiation heating area, thereby ensuring the heat absorption rate of the boiler furnace;

[0024] The smoke gas smoke partition wall and the dust falling device are provided, the smoke gas after combustion contains particulate matters, in order to avoid causing the ash deposition on the heating surface, the smoke partition wall is arranged on the convection tube bundle heating surface to change the smoke gas direction, the smoke dust is separated through the smoke gas turning area from lower to upper, the dust falling device is arranged below the convection tube bundle heating surface to collect the smoke dust, and the problems of ash deposition and uneven heat transfer of the tail heating surface are avoided;

[0025] The SCR denitration interface device is provided, the smoke gas temperature at the outlet position of the convection tube bundle is 380 DEG C through the heating surface of the convection tube bundle, the normal operation of the denitration equipment is ensured, and the environmental protection design concept of the boiler is met. Attached Figure Description

[0026] Fig. 1 This is a schematic diagram of the structure of a carbon black tail gas boiler with an in-furnace heat storage and combustion stabilization device proposed in this utility model.

[0027] Fig. 2 This is a schematic diagram of the structure of the in-furnace heat storage and combustion stabilization device in a carbon black tail gas boiler with an in-furnace heat storage and combustion stabilization device proposed in this utility model.

[0028] Fig. 3 This is a schematic diagram of the structure of an air preheater in a carbon black tail gas boiler with an in-furnace heat storage and combustion stabilization device proposed in this utility model.

[0029] In the diagram: 1. Burner; 2. In-furnace heat storage and combustion stabilization device; 3. Furnace heating surface; 4. Convection heating surface; 5. High-temperature economizer; 6. Air preheater; 7. Low-temperature economizer; 8. Ash removal device; 9. Convection baffle wall; 10. SCR denitrification interface device. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Example

[0031] Reference Figs. 1-3The application discloses a carbon black tail gas boiler with an in-furnace heat storage and combustion stabilizing device, which comprises a boiler, wherein the boiler body adopts a membrane water cooling wall structure, and further comprises a burner 1 fixedly connected in the boiler and used for burning carbon black tail gas fuel, an in-furnace heat storage and combustion stabilizing device 2 fixedly connected in the boiler and used for storing heat of combustion flame in the range of the in-furnace heat storage and combustion stabilizing device 2, a hearth heating surface 3 fixedly connected in the boiler and located above the in-furnace heat storage and combustion stabilizing device 2 and used for absorbing radiation heat, a convection heating surface 4 fixedly connected in the boiler and used for carrying out convection heat exchange on the gas after absorbing the radiation heat, an SCR denitration interface device 10 fixedly connected in the boiler and used for carrying out denitration treatment on the gas after the convection heat exchange, a high-temperature economizer 5 fixedly connected in the boiler and used for sucking the gas after the denitration treatment, an air preheater 6 fixedly connected in the boiler and connected with an exhaust end of the high-temperature economizer 5 and used for carrying out heat exchange on the gas discharged from the high-temperature economizer 5 to obtain heated gas, and a low-temperature economizer 7 fixedly connected in the boiler and connected with an exhaust end of the air preheater 6 and used for discharging the gas to be connected to auxiliary equipment of a tail boiler, wherein the boiler is provided with the convection heating surface 4 between the hearth heating surface 3 and the SCR denitration interface device 10, the convection heating surface 4 is provided with a convection smoke partition wall 9, the convection smoke partition wall 9 is provided below with a dust falling device 8, the convection heating surface 4 carries out convection heat exchange on the gas, then the smoke gas direction is changed by the convection smoke partition wall 9 to separate the smoke dust, and the separated smoke dust is collected by the dust falling device 8, the air preheater 6 adopts an arrangement structure with middle air inlet and two end air outlets in communication, the heated gas of the air preheater 6 enters the burner 1, the burner 1 is obliquely installed on the hearth heating surface 3, and the center of the burner 1 is aligned with the center of the in-furnace heat storage and combustion stabilizing device 2.

[0032] Combustion stage: the carbon black tail gas fuel and high-temperature hot air heated by the air preheater 6 enter the burner 1 together, the mixed fuel and hot air are sprayed into the hearth at a specific angle due to the oblique installation of the burner 1 and the alignment with the in-furnace heat storage and combustion stabilizing device 2, the combustion is started in the range of the in-furnace heat storage and combustion stabilizing device 2, the heat storage material in the in-furnace heat storage and combustion stabilizing device 2 rapidly absorbs and stores part of the heat released by combustion, continuously releases heat during the combustion process, strengthens the combustion efficiency, and enables the carbon black tail gas to be more fully and stably combusted.

[0033] Heat transfer and smoke dust separation stage: the high-temperature smoke gas flows upwards, first passes through the hearth heating surface 3, the hearth heating surface 3 transfers heat to the internal working medium by absorbing the radiation heat of the smoke gas, then the smoke gas enters the convection heating surface 4 to carry out convection heat exchange, in the region of the convection heating surface 4, the convection smoke partition wall 9 guides the smoke gas to change the direction, so that the smoke gas flows in a turning smoke area from below to above, in this process, the particulate matters in the smoke gas are separated from the smoke gas due to the inertial effect and fall into the dust falling device 8 below the convection heating surface 4 to be collected, thereby avoiding the problems of ash accumulation on the heating surface and uneven heat transfer of the tail heating surface;

[0034] De-nitration and further heat exchange stage: the medium-temperature flue gas after dust separation, the temperature reaches 380 DEG C at the outlet position of the convection tube bundle, is led out through the SCR de-nitration interface device 10 for de-nitrogen treatment, and the treated flue gas is connected to the high-temperature economizer 5 to exchange heat with the low-temperature feed water, further reducing the flue gas temperature, and then the flue gas flows through the air preheater 6 and the low-temperature economizer 7 in turn, in the air preheater 6, the high-temperature flue gas is used to heat the air of fuel air distribution, since the air preheater 6 adopts the structure of middle air inlet and two-end air outlet communication, this design not only improves the hot air temperature, further improves the combustion efficiency, but also reduces the air side resistance, reduces the power consumption of the air blower, achieves the effect of energy saving, and the air preheater 6 adopts the anti-corrosion material (weathering steel or stainless steel) to resist the corrosion of sulfides in the flue gas, and finally the low-temperature flue gas after heat exchange in the low-temperature economizer 7 is connected to the tail boiler supporting auxiliary equipment for subsequent treatment.

[0035] The utility model has the advantages that:

[0036] The furnace internal heat storage combustion stabilizing device 2 is provided. The furnace internal heat storage combustion stabilizing device 2 mainly comprises heat storage materials, refractory materials and heat preservation materials. The furnace internal heat storage combustion stabilizing device 2 has a heat storage function in the combustion flame range, and can strengthen the combustion efficiency. Meanwhile, the furnace membrane water cooling wall does not need to be laid with refractory materials to provide sufficient radiation heating area, thereby ensuring the heat absorption rate of the boiler furnace.

[0037] The flue gas smoke partition wall and the ash falling device 8 are provided. Since the flue gas after combustion contains particulate matters, in order to avoid causing the ash deposition on the heating surface, the smoke partition wall is arranged on the convection tube bundle heating surface to change the flue gas direction, and the flue gas is turned from the lower part to the upper part to realize the dust separation. The ash falling device 8 is arranged below the convection tube bundle heating surface to collect the ash, thereby avoiding the problems of ash deposition and uneven heat transfer of the tail heating surface.

[0038] The hot air temperature is improved. Since the carbon black tail gas fuel has low heat value, the hot air temperature of the fuel air distribution needs to be improved to further improve the combustion efficiency. The air preheater 6 with the middle air inlet and the two-end air outlet communication structure is used between the high-temperature economizer 5 and the low-temperature economizer 7, which can not only improve the hot air temperature of the fuel air distribution, but also reduce the air side resistance to reduce the power of the air blower to achieve the energy saving effect. Meanwhile, the air preheater 6 adopts the anti-corrosion material (weathering steel or stainless steel), which reduces the corrosion rate of sulfides in the flue gas on the air preheater 6.

[0039] The SCR de-nitration interface device 10 is arranged. The heating surface of the convection tube bundle is reasonably designed, so that the flue gas temperature is 380 DEG C at the outlet position of the convection tube bundle, which can ensure the normal operation of the de-nitration equipment and meet the boiler environmental protection design concept.

[0040] The utility model discloses simple structure, and the boiler body adopts the membrane type water cooling wall structure, and light -duty heat -preservation furnace wall can greatly reduce the installation period and installation cost of boiler.

[0041] The above is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A char combustion tail gas boiler with an in-furnace heat accumulation combustion stabilizing device, comprising a boiler, the boiler body adopts a membrane water cooling wall structure, characterized in that, Also include: Burner (1) is fixedly connected in the boiler, for burning carbon black tail gas fuel; In-furnace heat accumulation and combustion stabilizing device (2) is fixedly connected in the boiler, and the combustion flame is in the range of the in-furnace heat accumulation and combustion stabilizing device (2); Furnace heating surface (3) is fixedly connected in the boiler, and the furnace heating surface (3) is located above the in-furnace heat accumulation and combustion stabilizing device (2) and is used for absorbing radiant heat; The convection heating surface (4) is fixedly connected in the boiler, and the convection heating surface (4) is used for convection heat exchange of the gas after absorbing radiant heat; SCR denitration interface device (10) is fixedly connected in the boiler, and the SCR denitration interface device (10) is used for denitrogenation treatment of the gas after convection heat exchange; High-temperature economizer (5) is fixedly connected in the boiler and is used for sucking the gas after denitrogenation treatment; Air preheater (6) is fixedly connected in the boiler and is connected with the gas outlet end of the high-temperature economizer (5), used for heat exchange of the gas discharged by the high-temperature economizer (5) to obtain heated gas; Low-temperature economizer (7) is fixedly connected in the boiler and is connected with the gas outlet end of the air preheater (6), and the discharged gas will be connected to the tail boiler supporting auxiliary equipment.

2. A char black tail gas boiler with in-furnace heat storage combustion stabilizing device according to claim 1, characterized in that, The boiler is provided with the convection heating surface (4) between the furnace heating surface (3) and the SCR denitration interface device (10).

3. A char black tail gas boiler with in-furnace heat storage combustion stabilizing device according to claim 2, characterized in that, The convection heating surface (4) is provided with a convection smoke partition wall (9), and a dust falling device (8) is arranged below the convection smoke partition wall (9), the convection heating surface (4) performs convection heat exchange on the gas, and then the smoke dust is separated by changing the smoke gas direction of the convection smoke partition wall (9) and is collected by the dust falling device (8).

4. A char black tail gas boiler with in-furnace heat storage combustion stabilizing device according to claim 3, characterized in that, The air preheater (6) adopts an arrangement structure of middle air inlet and two-end air outlet communication, and the heated gas of the air preheater (6) will enter the burner (1).

5. A char black tail gas boiler with in-furnace heat storage combustion stabilizing device according to claim 1, characterized in that, The burner (1) is obliquely installed on the furnace heating surface (3), and the center of the burner (1) is aligned with the center of the in-furnace heat accumulation and combustion stabilizing device (2).

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