Smoldering flue gas treatment method and system and solid waste treatment system

Abstract

The present invention discloses a smoldering flue gas treatment method and system and a solid waste treatment system. The smoldering flue gas treatment system comprises: a desulfurization device, a denitrification device and a flue gas compression device. The desulfurization device comprises a first flue gas inlet and a first flue gas outlet, the first flue gas inlet is suitable for passing the smoldering flue gas, so as to perform desulfurization treatment on the smoldering flue gas; the denitrification device comprises a second flue gas inlet and a second flue gas outlet, the second flue gas inlet is connected with the first flue gas outlet, so that the smoldering flue gas passes into the denitrification device, so as to perform denitrification treatment on the smoldering flue gas; the flue gas compression device comprises a third flue gas inlet, a combustible gas outlet and a liquid outlet, the third flue gas inlet is connected with the second flue gas outlet. The smoldering flue gas treatment system of the present invention has the advantages of energy saving and environmental protection.

Description

Technical Field

[0001] The present invention relates to the technical field of solid waste treatment, and in particular, to a smoldering flue gas treatment method and system and a solid waste treatment system. Background Art

[0002] Smoldering treatment technology can treat solid wastes with high calorific value, including oily sludge, domestic solid waste, municipal sludge, etc., and has the advantages of low treatment energy consumption, wide application range, safety and high efficiency, and flexible treatment. However, smoldering tail gas includes a variety of atmospheric pollutants such as carbon monoxide (CO), sulfur dioxide (SO2), nitrogen oxides (NOx), volatile organic compounds (VOCs), hydrocarbons and dust, etc. It is difficult to form an effective flue gas purification method to remove all pollutants in the tail gas, and it is impossible to remove all pollutants in the smoldering tail gas, causing pollutants to cause harm to the environment and human body. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention provides a smoldering smoke treatment system, which has the advantages of energy saving and environmental protection.

[0005] The embodiment of the present invention further provides a solid waste treatment system, which has the smoldering smoke treatment system of the above embodiment.

[0006] The smoldering flue gas treatment method of the embodiment of the present invention comprises the following steps: desulfurizing the smoldering flue gas; denitrifying the smoldering flue gas; reducing the temperature of the smoldering flue gas to below 30°C;

[0007] The smoldering flue gas is compressed to a pressure of 7.40 MPa to obtain liquid CO2 and combustible gas.

[0008] The smoldering flue gas treatment method of the embodiment of the present invention respectively performs desulfurization treatment on the smoldering flue gas, thereby removing pollutants such as sulfur dioxide and nitrogen oxides in the smoldering flue gas, and then performs denitrification treatment on the smoldering flue gas, thereby removing nitrogen oxides in the smoldering flue gas, and finally pressurizes and cools the smoldering flue gas to separate carbon dioxide to obtain a relatively pure combustible gas for subsequent combustion, thereby greatly reducing the pollutants in the smoldering flue gas, and the remaining combustible gas can be used as fuel, thereby improving energy utilization.

[0009] Therefore, the smoldering flue gas treatment method according to the embodiment of the present invention has the advantages of energy saving and environmental protection.

[0010] In some embodiments, before subjecting the smoldering flue gas to desulfurization treatment, the process further includes: subjecting the smoldering flue gas to condensation treatment and reducing the temperature of the smoldering flue gas to below a first preset value, thereby removing water vapor in the smoldering flue gas.

[0011] In some embodiments, the first preset value is greater than or equal to 40°C and less than or equal to 60°C.

[0012] In some embodiments, the denitrification treatment of the smoldering flue gas further includes: dust removal treatment of the smoldering flue gas.

[0013] The smoldering flue gas treatment system of the embodiment of the present invention includes: a desulfurization device, the desulfurization device includes a first flue gas inlet and a first flue gas outlet, the first flue gas inlet is suitable for passing smoldering flue gas, thereby desulfurizing the smoldering flue gas; a denitrification device, the denitrification device includes a second flue gas inlet and a second flue gas outlet, the second flue gas inlet is connected to the first flue gas outlet, so that the smoldering flue gas passes into the denitrification device, thereby denitrifying the smoldering flue gas; a flue gas compression device, the flue gas compression device includes a third flue gas inlet, a combustible gas outlet and a liquid outlet, the third flue gas inlet is connected to the second flue gas outlet, so that the smoldering flue gas passes into the flue gas compression device, thereby compressing the smoldering flue gas to obtain liquid CO2 and combustible gas.

[0014] In some embodiments, the smoldering smoke treatment system further comprises: a condensing device, the condensing device comprising a fourth smoke inlet, a third smoke outlet and a drain, and the third smoke outlet is in communication with the first smoke inlet.

[0015] In some embodiments, the smoldering smoke treatment system further comprises: a liquid storage tank, the liquid storage tank comprising a liquid inlet, and the liquid inlet is connected to the liquid outlet.

[0016] The solid waste treatment system of an embodiment of the present invention includes: a smoldering furnace, which includes a solid waste inlet and a smoldering smoke outlet; a smoldering smoke treatment system, which is the smoldering smoke treatment system described in any of the above embodiments, and the fourth smoke inlet is connected to the smoldering smoke outlet.

[0017] In some embodiments, the smoldering stove further comprises a combustible gas inlet, wherein the combustible gas inlet is in communication with the combustible gas outlet.

[0018] In some embodiments, the solid waste treatment system further includes: an air heater, a fan and a hot air channel, the fan includes an air supply port, the smoldering furnace also includes a hot air inlet, one end of the hot air channel is connected to the air supply port, the other end of the hot air channel is connected to the hot air inlet, and the air heater is arranged on the hot air channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a solid waste treatment system according to an embodiment of the present invention.

[0020] Reference numerals:

[0021] Solid waste treatment system 100;

[0022] Desulfurization device 1; first flue gas inlet 11; first flue gas outlet 12;

[0023] Denitration device 2; second flue gas inlet 21; second flue gas outlet 22;

[0024] Flue gas compression device 3; third flue gas inlet 31; combustible gas outlet 32; liquid outlet 33;

[0025] Condensing device 4; fourth flue gas inlet 41; third flue gas outlet 42;

[0026] Liquid storage tank 5; liquid inlet 51;

[0027] Smoldering furnace 6; smoldering smoke outlet 61; combustible gas inlet 62;

[0028] Air heater 7; fan 8; hot air channel 9. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0030] The smoldering smoke treatment system according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0031] like Figure 1 As shown, the smoldering flue gas treatment system of the embodiment of the present invention includes a desulfurization device 1, a denitrification device 2 and a flue gas compression device 3.

[0032] The desulfurization device 1 includes a first flue gas inlet 11 and a first flue gas outlet 12. The first flue gas inlet 11 is suitable for passing smoldering flue gas, thereby desulfurizing the smoldering flue gas. The denitrification device 2 includes a second flue gas inlet 21 and a second flue gas outlet 22. The second flue gas inlet 21 is connected to the first flue gas outlet 12 so that the smoldering flue gas can pass into the denitrification device 2, thereby denitrifying the smoldering flue gas. The flue gas compression device 3 includes a third flue gas inlet 31, a combustible gas outlet 32 ​​and a liquid outlet 33. The third flue gas inlet 31 is connected to the second flue gas outlet 22 so that the smoldering flue gas can pass into the flue gas compression device 3, thereby compressing the smoldering flue gas to obtain liquid CO2 and combustible gas.

[0033] The specific implementation of the smoldering flue gas treatment system according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0034] The smoldering flue gas enters the desulfurization device 1 through the first flue gas inlet 11 for desulfurization treatment, thereby removing sulfur-containing pollutants such as sulfur dioxide contained in the smoldering flue gas, and then is discharged through the first flue gas outlet 12. The desulfurized smoldering flue gas enters the denitrification device 2 through the second flue gas inlet 21, undergoes denitrification treatment in the denitrification device 2, thereby removing nitrogen oxides in the smoldering flue gas, and then is discharged through the second flue gas outlet 22 after denitrification treatment. The smoldering flue gas after denitrification treatment enters the flue gas compression device 3 from the third flue gas inlet 31, compresses and cools the smoldering flue gas, adjusts the pressure to 7.40Mpa, and reduces the temperature to 30°C, thereby utilizing the different critical pressures and critical temperatures of CO, VOCs, hydrocarbons, and carbon dioxide to convert carbon dioxide in the smoldering flue gas from gaseous state to liquid state, and then separates it from the smoldering flue gas, thereby obtaining liquid carbon dioxide and combustible gas. Liquid carbon dioxide is discharged from the liquid outlet 33 for storage, and combustible gases, such as VOCs, are discharged from the combustible gas outlet 32 ​​for collection and combustion.

[0035] The smoldering flue gas treatment system of the embodiment of the present invention utilizes a desulfurization device 1 and a denitrification device 2 to remove pollutants such as sulfur dioxide and nitrogen oxides in the smoldering flue gas, respectively, and then utilizes a flue gas compressor to treat the smoldering flue gas, thereby separating carbon dioxide to obtain a relatively pure combustible gas for subsequent combustion, thereby greatly reducing pollutants in the smoldering flue gas, and the remaining combustible gas can be used as fuel, thereby improving energy utilization.

[0036] Therefore, the smoldering flue gas treatment system according to the embodiment of the present invention has the advantages of energy saving and environmental protection.

[0037] The smoldering flue gas treatment system of the embodiment of the present invention comprises a desulfurization device 1 , a denitrification device 2 , a flue gas compression device 3 , a condensation device 4 and a liquid storage tank 5 .

[0038] In some embodiments, the condensing device 4 includes a fourth smoke inlet 41, a third smoke outlet 42 and a drain, and the third smoke outlet 42 is connected to the first smoke inlet 11. In other words, the smoldering smoke enters the condensing device 4 through the fourth smoke inlet 41, and the water vapor in the smoldering smoke condenses to form condensed water, thereby removing the water vapor in the smoldering smoke. On the one hand, removing the water vapor in the smoldering smoke can make the final combustible gas free of water vapor for subsequent combustion use; on the other hand, the condensing device 4 is first used to cool the smoldering smoke, thereby reducing the cooling burden of the subsequent smoke compression device 3, thereby extending the service life of the equipment.

[0039] In some embodiments, Figure 1 As shown, the liquid storage tank 5 includes a liquid inlet 51, which is connected to the liquid outlet 33, so as to facilitate the collection and storage of the separated liquid carbon dioxide.

[0040] The solid waste treatment system 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0041] The solid waste treatment system 100 of the embodiment of the present invention comprises a smoldering furnace 6 and a smoldering smoke treatment system. The smoldering smoke treatment system is the smoldering smoke treatment system of any of the above embodiments, the smoldering furnace 6 comprises a solid waste inlet and a smoldering smoke outlet 61, and the fourth smoke inlet 41 is connected to the smoldering smoke outlet 61.

[0042] The specific implementation of the solid waste treatment system 100 according to the embodiment of the present invention is described below with reference to the accompanying drawings.

[0043] After the solid waste enters the furnace body of the smoldering furnace 6, it is burned to generate smoldering flue gas, which is discharged from the smoldering flue gas outlet 61. The smoldering flue gas enters the desulfurization device 1 through the first flue gas inlet 11 for desulfurization treatment, thereby removing sulfur-containing pollutants such as sulfur dioxide contained in the smoldering flue gas, and then is discharged through the first flue gas outlet 12. The desulfurized smoldering flue gas enters the denitrification device 2 through the second flue gas inlet 21, and is denitrified in the denitrification device 2 to remove nitrogen oxides in the smoldering flue gas. After the denitrification treatment, it is discharged through the second flue gas outlet 22. The smoldering flue gas after denitrification enters the flue gas compression device 3 from the third flue gas inlet 31, compresses and cools the smoldering flue gas, and obtains liquid carbon dioxide and combustible gas. The liquid carbon dioxide is discharged from the liquid outlet 33 for storage, and is discharged from the combustible gas outlet 32 ​​for collection and combustion.

[0044] The solid waste treatment system 100 according to the embodiment of the present invention has the advantages of energy saving and environmental protection.

[0045] In some embodiments, Figure 1As shown, the smoldering furnace 6 further includes a combustible gas inlet 62, which is connected to the combustible gas outlet 32. In other words, the combustible gas discharged from the combustible gas outlet 32 ​​enters the smoldering furnace 6 through the combustible gas inlet 62 for combustion, thereby providing part of the combustion heat for the smoldering furnace 6, thereby further improving the energy utilization rate of the solid waste treatment system 100 of the embodiment of the present invention.

[0046] In some embodiments, Figure 1 As shown, the solid waste treatment system 100 of the embodiment of the present invention further includes an air heater 7, a fan 8 and a hot air channel 9. The fan 8 includes an air supply port, the smoldering furnace 6 also includes a hot air inlet, one end of the hot air channel 9 is connected to the air supply port, and the other end of the hot air channel 9 is connected to the hot air inlet, and the air heater 7 is arranged on the hot air channel 9. The air supplied by the fan 8 to the smoldering furnace 6 is heated by the air heater 7, thereby providing hot air to the smoldering furnace 6 to cause the solid waste to smolder.

[0047] The smoldering flue gas treatment method according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0048] The smoldering flue gas treatment method of the embodiment of the present invention comprises the following steps:

[0049] The smoldering flue gas is subjected to desulfurization treatment; the smoldering flue gas is subjected to denitrification treatment; the temperature of the smoldering flue gas is reduced to below 30°C; the smoldering flue gas is compressed to a pressure of 7.40Mpa to obtain liquid CO2 and combustible gas.

[0050] The implementation process of the smoldering flue gas treatment method according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0051] After the solid waste enters the furnace body of the smoldering furnace 6, it is burned to produce smoldering flue gas. The produced smoldering flue gas enters the desulfurization device 1 for desulfurization treatment, thereby removing sulfur-containing pollutants such as sulfur dioxide contained in the smoldering flue gas. The desulfurized smoldering flue gas is transported to the denitrification device 2, where it is denitrified to remove nitrogen oxides in the smoldering flue gas. The smoldering flue gas after denitrification enters the flue gas compression device 3, which compresses and cools the smoldering flue gas, adjusts the pressure to 7.40Mpa, and reduces the temperature of the smoldering flue gas to 30°C, thereby utilizing the different critical pressures and critical temperatures of CO, VOCs, hydrocarbons and carbon dioxide to convert the carbon dioxide in the smoldering flue gas from gaseous state to liquid state, and then separates it from the smoldering flue gas, thereby obtaining liquid carbon dioxide and combustible gas.

[0052] The smoldering flue gas treatment method of the embodiment of the present invention respectively performs desulfurization treatment on the smoldering flue gas, thereby removing pollutants such as sulfur dioxide and nitrogen oxides in the smoldering flue gas, and then performs denitrification treatment on the smoldering flue gas, thereby removing nitrogen oxides in the smoldering flue gas, and finally pressurizes and cools the smoldering flue gas to separate carbon dioxide to obtain a relatively pure combustible gas for subsequent combustion, thereby greatly reducing the pollutants in the smoldering flue gas, and the remaining combustible gas can be used as fuel, thereby improving energy utilization.

[0053] Therefore, the smoldering flue gas treatment method according to the embodiment of the present invention has the advantages of energy saving and environmental protection.

[0054] In some embodiments, the process further includes the following steps before subjecting the smoldering flue gas to desulfurization treatment:

[0055] The smoldering smoke is condensed and the temperature of the smoldering smoke is reduced to below a first preset value, thereby removing water vapor in the smoldering smoke. In other words, the smoldering smoke discharged from the smoldering furnace 6 first enters the condensing device 4, so that the water vapor in the smoldering smoke is condensed to form condensed water, thereby removing the water vapor in the smoldering smoke. On the one hand, removing the water vapor in the smoldering smoke can make the final combustible gas free of water vapor for subsequent combustion use; on the other hand, the condensing device 4 is first used to cool the smoldering smoke, thereby reducing the cooling burden of the subsequent smoke compression device 3, thereby extending the service life of the equipment.

[0056] Preferably, the first preset value is greater than or equal to 40°C and less than or equal to 60°C. Optionally, the first preset value is greater than or equal to 45°C and less than or equal to 55°C; Optionally, the first preset value is greater than or equal to 49°C and less than or equal to 51°C. On the one hand, the smoldering flue gas can be cooled to condense condensed water, thereby removing water vapor; on the other hand, the load of the equipment used for condensation will not be too large and damaged.

[0057] The first preset value includes, but is not limited to, 40°C, 44°C, 48°C, 50°C, 55°C, 58°C or 60°C.

[0058] In some embodiments, subjecting the smoldering flue gas to denitrification treatment further includes the following steps: subjecting the smoldering flue gas to dust removal treatment, thereby removing smoke dust in the smoldering flue gas, and further removing pollutants in the smoldering flue gas.

[0059] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0063] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0064] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for treating smoldering flue gas, characterized in that: The following steps are involved: Desulfurize the smoldering flue gas; Denitrifying the smoldering flue gas; reducing the temperature of the smoldering smoke to below 30°C; The smoldering flue gas is compressed to a pressure of 7.40 MPa, so as to convert the carbon dioxide in the smoldering flue gas from gaseous state to liquid state by utilizing the different critical pressures and critical temperatures of CO, VOCs, hydrocarbons and carbon dioxide, and then separate it from the smoldering flue gas to obtain liquid CO2 and combustible gas; The desulfurization treatment of the smoldering flue gas also includes: Condensing the smoldering smoke and reducing the temperature of the smoldering smoke to below a first preset value, thereby removing water vapor from the smoldering smoke; The first preset value is greater than or equal to 40° C. and less than or equal to 60° C.

2. The method for treating smoldering flue gas according to claim 1, characterized in that: The denitrification treatment of the smoldering flue gas also includes: dust removal treatment of the smoldering flue gas.

3. A smoldering flue gas treatment system, used to implement the smoldering flue gas treatment method according to any one of claims 1 to 2, characterized in that: include: A desulfurization device, the desulfurization device comprising a first flue gas inlet and a first flue gas outlet, the first flue gas inlet being suitable for introducing smoldering flue gas, thereby performing desulfurization treatment on the smoldering flue gas; A denitration device, the denitration device comprising a second flue gas inlet and a second flue gas outlet, the second flue gas inlet being connected to the first flue gas outlet so that the smoldering flue gas can pass into the denitration device, thereby performing denitration treatment on the smoldering flue gas; A flue gas compression device, comprising a third flue gas inlet, a combustible gas outlet and a liquid outlet, wherein the third flue gas inlet is connected to the second flue gas outlet so that the smoldering flue gas can pass into the flue gas compression device, thereby compressing the smoldering flue gas to obtain liquid CO2 and combustible gas.

4. The smoldering smoke treatment system according to claim 3, characterized in that: Further including: A condensing device, wherein the condensing device comprises a fourth smoke inlet, a third smoke outlet and a drain outlet, and the third smoke outlet is connected to the first smoke inlet.

5. The smoldering smoke treatment system according to claim 4, characterized in that: Further including: A liquid storage tank comprises a liquid inlet, wherein the liquid inlet is communicated with the liquid outlet.

6. A solid waste treatment system, characterized in that: include: A smoldering furnace, the smoldering furnace comprising a solid waste inlet and a smoldering smoke outlet; A smoldering smoke treatment system, wherein the smoldering smoke treatment system is the smoldering smoke treatment system as described in claim 4 or 5, and the fourth smoke inlet is connected to the smoldering smoke outlet.

7. The solid waste treatment system according to claim 6, characterized in that: The smoldering furnace further includes a combustible gas inlet, which is in communication with the combustible gas outlet.

8. The solid waste treatment system according to claim 6, characterized in that: Further including: Air heaters, fans and hot air ducts, The fan includes an air supply port, the smoldering stove also includes a hot air inlet, one end of the hot air channel is connected to the air supply port, the other end of the hot air channel is connected to the hot air inlet, and the air heater is arranged on the hot air channel.

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