Method and device for preparing instant gasified slurry from solid waste

Abstract

The invention relates to the technical field of organic solid waste treatment, in particular to a method and device for preparing instant gasified slurry from solid waste, and the method for preparing the instant gasified slurry from the solid waste comprises the following steps: conveying a solid waste raw material, a modifier and water into a modification tank for mixing to obtain modified slurry, an additive and water are conveyed into an additive tank to be modified and mixed, an additive solution is obtained, the powder, the modified slurry, the additive solution and water are conveyed into a mixer to be stirred and mixed, mixed slurry is obtained, the particle size of the powder is smaller than that of particles in the modified slurry, and the mixed slurry is conveyed into a buffer tank to be stirred and mixed; the concentration of the mixed slurry in the buffer tank is detected, when the concentration of the mixed slurry in the buffer tank is within the target slurry concentration range, the mixed slurry in the buffer tank is conveyed to the storage tank to be stored, and the slurry prepared through the method for preparing the instant gasified slurry through the solid waste is good in uniformity.

Description

Technical Field

[0001] The invention relates to the technical field of organic solid waste treatment, and in particular to a method and device for preparing quick-dissolving gasification slurry by utilizing solid waste. Background Art

[0002] When organic solid waste is gasified under strong reducing conditions, dioxins, phenols, tar and other substances produced during the gasification process can be completely decomposed. At the same time, liquid slag is used, and heavy metals such as cadmium, lead, chromium and mercury in the organic solid waste are imprisoned in the molten ash, realizing the clean treatment of organic solid waste. For organic waste with high internal water content, complex composition and difficult biochemical treatment, wet feeding is suitable, and the organic solid waste needs to be prepared into a gasification slurry with good fluidity.

[0003] However, the particle size of the gasification slurry prepared in the related art is uneven, which affects the uniformity of the slurry. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides a method for preparing instant gasification slurry using solid waste, and the prepared slurry has good uniformity.

[0005] The method for preparing instant gasification slurry using solid waste in an embodiment of the present invention comprises: conveying solid waste raw materials, a modifier and water to a modification tank for modification and mixing to obtain a modified slurry; conveying an additive and water to an additive tank for mixing to obtain an additive solution; conveying a powder, the modified slurry, the additive solution and water to a mixer for stirring and mixing to obtain a mixed slurry, wherein the particle size of the powder is smaller than the particle size of the particulate matter in the modified slurry; conveying the mixed slurry to a buffer tank, detecting the concentration of the mixed slurry in the buffer tank, and when the concentration of the mixed slurry in the buffer tank is within the target slurry concentration range, conveying the mixed slurry in the buffer tank to a storage tank for storage.

[0006] The method for preparing instant gasification slurry using solid waste according to the embodiment of the present invention has good uniformity of the prepared slurry.

[0007] In some embodiments, solid waste raw materials, modifiers and water are transported to a modification tank for modification and mixing to obtain modified slurry, including: adding solid waste raw materials, modifiers and water to the modification tank in proportion, wherein the addition ratio of the modifier is 1%-10%; using a modification agitator to stir the solution in the modification tank in an intermittent stirring manner, and the stirring time of the modification agitator is 0.5-3h; when the weight percentage concentration of the slurry in the modification tank is greater than a preset concentration, a modified slurry is obtained, wherein the preset concentration is 40%-60%.

[0008] In some embodiments, the powder, the modified slurry, the additive solution and water are conveyed to a mixer for stirring and mixing to obtain a mixed slurry, including: adding the powder, the modified slurry, the additive solution and water into the mixer in proportion; stirring the solution in the mixer with a mixing agitator, the mixing agitator comprising a rotating shaft and a plurality of stirring blades spaced apart in the axial direction of the rotating shaft, the solution in the mixer moves toward the outlet direction of the mixer under the driving action of the stirring blades; intercepting the solution in the mixer with an overflow baffle, when the liquid level of the solution in the mixer exceeds the overflow baffle, the solution in the mixer overflows from the overflow baffle to obtain a mixed slurry.

[0009] In some embodiments, the mixed slurry is conveyed to a buffer tank, comprising: when the mixed slurry overflows from the mixer, the overflowed mixed slurry is conveyed to a filter; using the filter to filter the solution overflowing from the overflow baffle; and conveying the solution passing through the filter to the buffer tank.

[0010] In some embodiments, when water is added into the mixer, atomized water is sprayed into the mixer using an atomizing nozzle, wherein the atomizing nozzle is disposed at the inlet of the mixer and has an angle with the vertical plane.

[0011] In some embodiments, the concentration of the mixed slurry in the buffer tank is detected, and when the concentration of the mixed slurry in the buffer tank is within the target slurry concentration range, the mixed slurry in the buffer tank is transported to a storage tank for storage, including: using a concentration meter to detect the concentration of the solution in the buffer tank; when the concentration of the solution in the buffer tank is not within the target slurry concentration range, pumping the solution in the buffer tank into the mixer to establish a slurry circulation, and adjusting the addition ratio of powder, modified slurry, additive solution and water according to the concentration of the solution in the buffer tank until the concentration of the solution in the buffer tank is within the target slurry concentration range; when the concentration of the solution in the buffer tank is within the target slurry concentration range, transporting the solution in the buffer tank to a storage tank for storage.

[0012] In some embodiments, the target slurry concentration is 60%-70%.

[0013] In some embodiments, the additive and water are conveyed to an additive tank for mixing to obtain an additive solution, including: adding the additive and water to the additive tank in proportion; stirring the solution in the additive tank with an additive agitator to obtain an additive solution, wherein the weight percentage concentration of the additive solution is 20%-40%.

[0014] An embodiment of the present invention also proposes a device for preparing instant gasification slurry using solid waste, comprising: a modification tank, which is used to modify and mix solid waste raw materials, modifiers and water to obtain modified slurry; an additive tank, which is used to mix additives and water to obtain additive solution; a mixer, which is used to stir and mix powder, modified slurry, additive solution and water to obtain mixed slurry, wherein the particle size of the powder is smaller than the particle size of the particulate matter in the modified slurry; a buffer tank, which is used to receive the mixed slurry and detect the concentration of the mixed slurry in the buffer tank; and a storage tank, which is used to receive and store the mixed slurry in the buffer tank when the concentration of the mixed slurry in the buffer tank is within the target slurry concentration range.

[0015] In some embodiments, the mixer includes an atomizing nozzle, which is disposed at the inlet of the mixer and has an angle with the vertical plane so as to spray atomized water into the mixer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flow chart of a method for preparing instant gasification slurry using solid waste according to an embodiment of the present invention.

[0017] Figure 2 It is a schematic diagram of a device for preparing instant gasification slurry using solid waste according to an embodiment of the present invention.

[0018] Figure 3 Schematic diagram of an atomizing nozzle according to an embodiment of the present invention.

[0019] Reference numerals:

[0020] Modification tank 1, modification agitator 11, modification tank inlet 12, modification tank outlet 13, first pump 14, first flow meter 15,

[0021] Additive tank 2, additive agitator 21, additive inlet 22, additive outlet 23, second pump 24, second flow meter 25,

[0022] Mixer 3, mixing stirrer 31, rotating shaft 32, stirring blade 33, atomizing nozzle 34,

[0023] Buffer tank 4, low pressure pump 41, first pipeline 42, return valve 421, second pipeline 43,

[0024] Storage tank 5, high pressure pump 51, filter 6,

[0025] water tank 7, water tank outlet 71, third pump 72, third flow meter 73,

[0026] Silo 8, silo outlet 81, variable frequency feeding valve 82, concentration meter 9. DETAILED DESCRIPTION

[0027] 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.

[0028] The following is combined with Figure 1-Figure 3 The method and device for preparing quick-dissolving gasification slurry by using solid waste according to an embodiment of the present invention are described.

[0029] like Figure 1 As shown, the method for preparing instant gasification slurry using solid waste in an embodiment of the present invention includes: conveying solid waste raw materials, modifiers and water to a modification tank for modification and mixing to obtain a modified slurry; conveying additives and water to an additive tank for mixing to obtain an additive solution; conveying powder, modified slurry, additive solution and water to a mixer for stirring and mixing to obtain a mixed slurry, wherein the particle size of the powder is smaller than the particle size of the particulate matter in the modified slurry; conveying the mixed slurry to a buffer tank, detecting the concentration of the mixed slurry in the buffer tank, and when the concentration of the mixed slurry in the buffer tank is within the target slurry concentration range, conveying the mixed slurry in the buffer tank to a storage tank for storage.

[0030] In the embodiment of the present invention, a modified slurry is obtained by adding a modifier to a modification tank to modify the solid waste raw material. The modifier can pre-destroy the structure of the flocs in the solid waste raw material, so that the bound water therein becomes free water, that is, the network, colloidal and other components that affect the slurry are changed into small molecular structures, so as to maximize the proportion of solid waste added to the slurry and improve the subsequent slurry quality. The slurry preparation method of first modifying the solid waste raw material and then mixing it with the additive solution and powder, because the particle size of the powder is smaller than the particle size of the particles in the modified slurry, the particle size gradation between the powder and the particles in the modified slurry is achieved, the slurry concentration and quality of the mixed slurry are improved, and the prepared slurry has good uniformity.

[0031] Furthermore, in this embodiment, by mixing the modified slurry with the additive solution and the powder, the powder can be filled in the gaps between the solid waste raw materials, reducing the void ratio between the particles, so that the particles can fill the space more effectively, so that more solid particles can be accommodated in the same volume, thereby increasing the concentration of the slurry.

[0032] Optionally, the solid waste raw material refers to organic solid waste, which may be municipal sludge, penicillin residue, furfural residue, or gasified residue. It is understood that the gasified residue here is carbon-containing gasified residue, and the organic part in the gasified residue is processed. For ease of description, this embodiment is described by taking municipal sludge as an example.

[0033] Optionally, the powder may be biomass carbon powder or coal powder, and the mesh size of the powder is 100-200 meshes.

[0034] Optionally, the additive is a water-coal slurry additive, the main components of which are polypropylene sulfate, naphthalene sulfonate, lignin sulfate, alkali, etc.

[0035] Optionally, the water is process water.

[0036] In some embodiments, solid waste raw materials, modifiers and water are transported to a modification tank for modification and mixing to obtain a modified slurry, including: adding solid waste raw materials, modifiers and water to the modification tank in proportion, wherein the addition ratio of the modifier is 1%-10%; using a modification agitator to stir the solution in the modification tank in an intermittent stirring manner, and the stirring time of the modification agitator is 0.5-3h; when the weight percentage concentration of the slurry in the modification tank is greater than a preset concentration, a modified slurry is obtained, wherein the preset concentration is 40%-60%.

[0037] Specifically, solid waste raw materials, modifiers and water are added to the modification tank in proportion, and the network structure of the flocculant in the sludge is broken up by strong shearing through the modification agitator, so that the fixed water therein can flow freely; the modifier can destroy the structure of the sludge flocs, so that the bound water therein becomes free water. Under the joint action of the modification agitator and the modifier, the fluidity of the sludge is improved, so that the sludge can be pre-slurried and kept in a suspended state, and the concentration of the obtained modified slurry is 40-60% (wt.), which increases the addition ratio of solid waste raw materials in the slurry and improves the subsequent slurrying characteristics.

[0038] In this embodiment, the solution in the modification tank is stirred by intermittent stirring to avoid continuous stirring that destroys the particle distribution balance in the solution and affects the viscosity of the slurry. The uniformity and stability of the slurry are maintained by intermittent stirring.

[0039] It will be appreciated that the modifier is generally alkaline, such as sodium hydroxide.

[0040] For example, the addition ratio of the modifier is 1%, 5%, 8%, or 10%. Of course, the addition ratio of the modifier may be a value outside the above range of the addition ratio of the modifier.

[0041] For example, the stirring time of the modified stirrer is 0.5 h, 1 h, 2 h, or 3 h. Of course, the stirring time of the modified stirrer can also be a time outside the above stirring time range.

[0042] In some embodiments, powder, modified slurry, additive solution and water are conveyed to a mixer for stirring and mixing to obtain a mixed slurry, including: adding powder, modified slurry, additive solution and water into the mixer in proportion; stirring the solution in the mixer with a mixing agitator, the mixing agitator including a rotating shaft and a plurality of stirring blades arranged at intervals in the axial direction of the rotating shaft, the solution in the mixer moves toward the outlet direction of the mixer under the driving action of the stirring blades; intercepting the solution in the mixer with an overflow baffle, when the liquid level of the solution in the mixer exceeds the overflow baffle, the solution in the mixer overflows from the overflow baffle to obtain a mixed slurry.

[0043] Specifically, powder, modified slurry, additive solution and water are added to the mixer in proportion. The mixer is horizontally arranged, and the box body is circular in shape. A rotating shaft is installed inside the box body. The rotating shaft is provided with a plurality of stirring blades arranged at intervals in the axial direction of the rotating shaft. The stirring blades are in the shape of a plow or a paddle. When the rotating shaft rotates, the rotating shaft drives the stirring blades to rotate, and the stirring blades drive the solution in the mixer to move toward the outlet direction of the mixer, so that the powder and water in the mixer are fully mixed. The mixed solution is driven by the stirring blades to move slowly forward, and the shear is further strengthened by the mixing agitator. Under the action of the additive, the solution is fully stirred and mixed to form a high-concentration slurry.

[0044] Furthermore, by providing an overflow baffle at the outlet of the mixer, the residence time of the solution in the mixer is ensured so that the liquid level in the mixer is maintained at a certain height, which helps to improve the mixing uniformity of the mixed slurry.

[0045] Furthermore, the additive solution can improve the dispersion performance of the solids in the solution in the mixer and the flow performance of the slurry, reduce the viscosity of the solution in the mixer, and increase the concentration of the solution in the mixer.

[0046] In some embodiments, the mixed slurry is conveyed to a buffer tank, including: when the mixed slurry overflows from the mixer, conveying the overflowed mixed slurry to a filter; filtering the solution overflowing from the overflow baffle by the filter; and conveying the solution passing through the filter to the buffer tank.

[0047] Specifically, a filter is arranged under the mixer. When the mixed slurry overflows from the mixer, the mixed slurry falls into the filter by its own weight. Particles whose particle size is larger than the filter holes of the filter are intercepted on the filter. The mixed slurry is filtered through the filter and the filtered mixed slurry is transported to the buffer tank, thereby improving the mixing uniformity of the mixed slurry.

[0048] For example, the filter is a vibrating filter with a mesh size of 50-200, which can filter out large particles and control the slurry to a suitable particle size.

[0049] In some embodiments, when water is added to the mixer, atomized water is sprayed into the mixer using an atomizing nozzle, wherein the atomizing nozzle is arranged at the inlet of the mixer and has an angle with the vertical plane. By tilting the atomizing nozzle toward the center of the mixer and spraying atomized water into the mixer, the contact area between the particulate atomized water and the powder is increased, thereby facilitating the mixing of water and powder.

[0050] Optionally, the particle size of the atomized water is less than 200 μm.

[0051] Optionally, there are multiple atomizing nozzles, such as 2, 3, or 4, and the multiple atomizing nozzles are evenly spaced and arranged in the circumferential direction of the mixer and are at the same height.

[0052] For example, the angle between the atomizing nozzle and the vertical plane is 20°-40°.

[0053] In some embodiments, the concentration of the mixed slurry in the buffer tank is detected, and when the concentration of the mixed slurry in the buffer tank is within the target slurry concentration range, the mixed slurry in the buffer tank is transported to a storage tank for storage, including: using a concentration meter to detect the concentration of the solution in the buffer tank; when the concentration of the solution in the buffer tank is not within the target slurry concentration range, pumping the solution in the buffer tank into a mixer to establish a slurry circulation, and adjusting the addition ratio of powder, modified slurry, additive solution and water according to the concentration of the solution in the buffer tank until the concentration of the solution in the buffer tank is within the target slurry concentration range; when the concentration of the solution in the buffer tank is within the target slurry concentration range, transporting the solution in the buffer tank to a storage tank for storage.

[0054] Specifically, during the first slurrying, since there is no water in the mixer, it is necessary to first add water to the mixer and start the stirring blades to establish a certain liquid level in the mixer, and the liquid level height is lower than the overflow baffle at the outlet of the mixer. At this time, stop adding water, gradually add powder, additive solution and modified slurry according to the solid-liquid ratio corresponding to the target slurry concentration, and then stop feeding. After fully mixing into slurry, continue to feed according to the determined ratio, and the fully stirred slurry overflows from the overflow baffle into the buffer tank.

[0055] When the solution concentration in the buffer tank is not within the target slurry concentration range, use the low-pressure slurry pump and return valve to pump the solution in the buffer tank back into the mixer to establish slurry circulation, and fine-tune the ratio of powder, modified slurry, additive solution and water added to the mixer according to the concentration value fed back by the concentration meter until the target slurry concentration is reached.

[0056] When the solution concentration in the buffer tank is within the target slurry concentration range, the solution in the buffer tank is transported to the storage tank for storage, and continuous slurrying is started to achieve rapid and continuous preparation of wet organic solid waste particles into gasification slurry, and the addition ratio of wet waste particles in the slurry is 15-30%.

[0057] The embodiment of the present invention ensures the target slurry concentration by automatically and accurately controlling the amount of material added and making corresponding adjustments according to the changes in the slurry load. The powder is transported by a variable frequency feeding valve, and the powder feeding amount is adjusted by changing the speed of the variable frequency feeding valve. An integral weighing sensor is provided on the silo storing the powder to provide quantitative feedback on the powder feed amount. The modified slurry and additive solution are transported by metering pumps respectively, and a mass flowmeter is provided at the outlet of the metering pump to feedback the material flow in the pipeline, and the metering pump delivery amount is automatically adjusted according to the design set value. Water is metered and transported by a centrifugal pump and a flowmeter at the pump outlet.

[0058] The mass flow rate and pulping amount of powder, modified slurry, water and additive solution are linked, and the feed amount of other materials is controlled based on the set calculation formula and control logic, with the powder feed amount as the benchmark. The input value (main variable) and the set value are finally output (dependent variable).

[0059] Powder parameters include: Powder feed rate G s is the input value (primary variable), the unit is kg / h; the moisture content of the powder is w s is the first setting value, the unit is kg / kg; the powder feed amount (dry basis) is G ds is the middle value, the unit is kg / h, and G ds =G s ×(1-w s ), powder water content W s is the middle value, the unit is kg / h, and W s =G s -G ds .

[0060] Additive parameters include: the proportion of additives in the powder θ t is the second set value, in kg / kg; the concentration of the additive solution is the third set value, in kg / kg; the amount of additive added G t is the middle value, the unit is kg / h, and G t =θ t ×G s ; Additive solution flow rate G tr is the first output value (variable), in kg / h, and Additive water consumption W t is the middle value, the unit is kg / h, and W t =G tr-G t .

[0061] Modified slurry parameters include: the proportion of waste in the powder θ f is the fourth set value, the unit is kg / kg; the waste material feed amount G f is the middle value, the unit is kg / h, and G f =θ f ×G s ; Waste moisture content w f is the fifth set value, in kg / kg; the proportion of waste modifier in waste is θ fg is the sixth set value, in kg / kg; the amount of waste modifier added G fg is the middle value, the unit is kg / h, and G fg =θ fg ×G f ; Solid concentration in waste pre-slurry θ fs is the seventh setting value, the unit is kg / kg; the waste pre-pulping flow rate G fl is the second output value (variable), the unit is kg / h, and G fl =[G f ×(1-w f )+G fg ] / θfs; waste pre-pulping water consumption W f is the middle value, the unit is kg / h, and W f =G fl ×(1-θ fs )-G f ×(1-w f ).

[0062] Mixed slurry parameters include: solid concentration in slurry θ ts is the eighth setting value, the unit is kg / kg; slurry process water volume W t is the third output value (variable), the unit is kg / h, and W t =G z ×(1-θ ts )-G s ×W s -W t ; Slurry preparation amount G z It is the fourth output value (dependent variable), and its unit is kg / h.

[0063] Optionally, both the buffer tank and the storage tank are provided with stirring paddles, and the agitator is kept running during the slurry making process to prevent the slurry in the buffer tank and the storage tank from settling.

[0064] Optionally, three material levels, high, medium and low, are provided in the silo to facilitate timely checking of material replenishment.

[0065] In some embodiments, the target slurry concentration is 60%-70%. By limiting the target slurry concentration, it is adapted to the gasification slurry concentration used in the entrained flow gasifier, which helps to stabilize the gasification process and ensure gasification efficiency and quality.

[0066] In some embodiments, the additive and water are transported to the additive tank for mixing to obtain the additive solution, including: adding the additive and water to the additive tank in proportion; stirring the solution in the additive tank with an additive stirrer to obtain the additive solution, wherein the weight percentage concentration of the additive solution is 20%-40%. By pre-mixing the additive with water to obtain the additive solution, and then adding the additive solution to the mixer, it can be ensured that the additive can be evenly dispersed in the solution in the mixer, which helps to improve the uniformity of mixing and improve the quality of the slurry.

[0067] like Figure 2-Figure 3 As shown, the device for preparing instant gasification slurry using solid waste according to an embodiment of the present invention comprises: a modification tank 1, which is used to modify and mix solid waste raw materials, a modifier and water to obtain a modified slurry; an additive tank 2, which is used to mix an additive and water to obtain an additive solution; a mixer 3, which is used to stir and mix powder, modified slurry, additive solution and water to obtain a mixed slurry, wherein the particle size of the powder is smaller than the particle size of the particulate matter in the modified slurry; a buffer tank 4, which is used to receive the mixed slurry and detect the concentration of the mixed slurry in the buffer tank 4; and a storage tank 5, which is used to receive and store the mixed slurry in the buffer tank 4 when the concentration of the mixed slurry in the buffer tank 4 is within the target slurry concentration range.

[0068] Specifically, Figure 2 As shown, a modification agitator 11 is provided in the modification tank 1, and the modification tank 1 has a modification tank inlet 12 and a modification tank outlet 13, and the modified slurry is transported to the mixer 3 through a first pump 14 and a first flowmeter 15. An additive agitator 21 is provided in the additive tank 2, and the additive tank 2 has an additive inlet 22 and an additive outlet 23, and the additive solution is transported to the mixer 3 through a second pump 24 and a second flowmeter 25. Water is stored in a water tank 7, and water is transported to the mixer 3 through a water tank outlet 71, a third pump 72 and a third flowmeter 73. Powder is stored in a silo 8, and the powder is transported to the mixer 3 through a silo outlet 81 and a variable frequency feeding valve 82. The mixer 3 is horizontally arranged and has a mixing agitator 31 inside. The outer shape of the box is circular, and a rotating shaft 32 is installed inside the box. The rotating shaft 32 is provided with a plurality of stirring blades 33 arranged at intervals in the axial direction of the rotating shaft 32. The stirring blades 33 are in the shape of a plow type or a paddle type. An overflow baffle is provided at the outlet of the mixer 3.

[0069] A filter 6 is provided below the mixer 3. The mixed slurry enters the buffer tank 4 after passing through the filter 6. The mixed slurry in the buffer tank 4 is output to the first pipeline 42 or the second pipeline 43 through the low-pressure pump 41. The low-pressure pump 41 is connected to the first pipeline 42 or the second pipeline 43 through the concentration meter 9. A return valve 421 is provided on the first pipeline 42. The return valve 421 is connected to the mixer 3, and the second pipeline 43 is connected to the storage tank 5. A high-pressure pump 51 is provided at the outlet end of the storage tank 5 to transport the gasified slurry to the gasifier.

[0070] When the rotating shaft 32 rotates, the rotating shaft 32 drives the stirring blades 33 to rotate. The stirring blades 33 drive the solution in the mixer 3 to move toward the outlet direction of the mixer 3, so that the powder and water in the mixer 3 are fully mixed. The mixed solution is driven by the stirring blades 33 to slowly move forward. The shear is further enhanced by the mixing agitator 31. Under the action of additives, the solid material and slurry additives are quickly dissolved into slurry in the slurrying water, and high-concentration slurry is formed after sufficient stirring and mixing.

[0071] In the embodiment of the present invention, a modifier is added into a modification tank 1 to modify the solid waste raw material to obtain a modified slurry. The modifier and the modified agitator 11 can pre-destroy the structure of the flocs in the solid waste raw material, so that the bound water therein is converted into free water, that is, the network, colloidal and other components that affect the slurrying are converted into small molecular structures, and the proportion of solid waste added in the slurry is increased as much as possible. Moreover, the size of the waste particles is uniformed through strong shearing and stirring, thereby improving the subsequent pulping quality.

[0072] Furthermore, by using a pulping method in which the solid waste raw materials are first modified and pretreated and then mixed with an additive solution and a powder, since the particle size of the powder is smaller than the particle size of the particles in the modified slurry, the particle size grading between the powder and the particles in the modified slurry is improved, thereby improving the slurry concentration and quality of the mixed slurry, and the prepared slurry has good uniformity.

[0073] Furthermore, by mixing the modified slurry with the additive solution and powder, the powder can fill the gaps between the solid waste raw materials, reducing the void ratio between the particles, so that the particles can fill the space more effectively, so that more solid particles can be accommodated under the same volume, thereby increasing the concentration of the slurry.

[0074] Furthermore, by providing an overflow baffle at the outlet of the mixer 3, the residence time of the solution in the mixer 3 is ensured so that the liquid level in the mixer 3 is maintained at a certain height, which helps to improve the mixing uniformity of the mixed slurry.

[0075] In some embodiments, Figure 3As shown, the mixer 3 includes an atomizing nozzle 34, which is arranged at the inlet of the mixer 3 and has an angle with the vertical plane to spray atomized water into the mixer 3. By tilting the atomizing nozzle 34 toward the center of the mixer 3 to spray atomized water into the mixer 3, the contact area between the particulate atomized water and the powder is increased, which facilitates the mixing of the atomized water and the powder.

[0076] For example, the angle A between the atomizing nozzle 34 and the vertical plane is 20°-40°.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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 that 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.

[0081] 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.

[0082] It is to be understood that the above embodiments are exemplary and are not to be construed as limiting the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for preparing instant gasification slurry using solid waste, characterized in that: include: The solid waste raw materials, the modifier and water are transported to the modification tank for modification and mixing to obtain a modified slurry; conveying the additive and water to an additive tank for mixing to obtain an additive solution; The powder, the modified slurry, the additive solution and water are transported to a mixer for stirring and mixing to obtain a mixed slurry, wherein the particle size of the powder is smaller than the particle size of the particles in the modified slurry; The mixed slurry is transported to a buffer tank, and the concentration of the mixed slurry in the buffer tank is detected. When the concentration of the mixed slurry in the buffer tank is within a target slurry concentration range, the mixed slurry in the buffer tank is transported to a storage tank for storage.

2. The method for preparing instant gasification slurry using solid waste according to claim 1, characterized in that: The solid waste raw materials, the modifier and water are transported to the modification tank for modification and mixing to obtain a modified slurry, including: Adding solid waste raw materials, modifiers and water into the modification tank in proportion, wherein the addition ratio of the modifier is 1%-10%; The solution in the modification tank is stirred by an intermittent stirring method using a modified agitator, and the stirring time of the modified agitator is 0.5-3h; When the weight percentage concentration of the slurry in the modification tank is greater than a preset concentration, a modified slurry is obtained, wherein the preset concentration is 40%-60%.

3. The method for preparing instant gasification slurry using solid waste according to claim 2, characterized in that: The powder, the modified slurry, the additive solution and water are transported to a mixer for stirring and mixing to obtain a mixed slurry, including: Adding the powder, the modified slurry, the additive solution and water into a mixer in proportion; The solution in the mixer is stirred by a mixing agitator, wherein the mixing agitator comprises a rotating shaft and a plurality of mixing blades arranged at intervals in the axial direction of the rotating shaft, and the solution in the mixer moves toward the outlet direction of the mixer under the driving action of the mixing blades; The solution in the mixer is intercepted by an overflow baffle. When the liquid level of the solution in the mixer exceeds the overflow baffle, the solution in the mixer overflows from the overflow baffle to obtain a mixed slurry.

4. The method for preparing instant gasification slurry using solid waste according to claim 3, characterized in that: The mixed slurry is transported to a buffer tank, comprising: When the mixed slurry overflows from the mixer, the overflowed mixed slurry is transported to a filter; Using the filter to filter the solution overflowing from the overflow baffle; The solution passing through the filter is sent to the buffer tank.

5. The method for preparing instant gasification slurry using solid waste according to claim 3, characterized in that: When water is added into the mixer, atomized water is sprayed into the mixer using an atomizing nozzle, wherein the atomizing nozzle is arranged at the inlet of the mixer and has an angle with the vertical plane.

6. The method for preparing instant gasification slurry using solid waste according to claim 3, characterized in that: The concentration of the mixed slurry in the buffer tank is detected, and when the concentration of the mixed slurry in the buffer tank is within a target slurry concentration range, the mixed slurry in the buffer tank is transported to a storage tank for storage, including: Using a concentration meter to detect the concentration of the solution in the buffer tank; When the concentration of the solution in the buffer tank is not within the target slurry concentration range, the solution in the buffer tank is pumped into the mixer to establish slurry circulation, and the addition ratio of the powder, modified slurry, additive solution and water is adjusted according to the concentration of the solution in the buffer tank until the concentration of the solution in the buffer tank is within the target slurry concentration range; When the concentration of the solution in the buffer tank is within the target slurry concentration range, the solution in the buffer tank is transported to a storage tank for storage.

7. The method for preparing instant gasification slurry using solid waste according to claim 6, characterized in that: The target slurry concentration is 60%-70%.

8. The method for preparing instant gasification slurry using solid waste according to claim 3, characterized in that: The additive and water are transported to the additive tank for mixing to obtain an additive solution, including: Add additives and water into the additive tank according to the proportions; The solution in the adding tank is stirred by an additive stirrer to obtain an additive solution, wherein the weight percentage concentration of the additive solution is 20%-40%.

9. A device for preparing instant gasification slurry using solid waste, characterized in that: include: A modification tank, which is used to modify and mix the solid waste raw material, the modifier and water to obtain a modified slurry; An additive tank, wherein the additive tank is used to mix the additive and water to obtain an additive solution; A mixer, the mixer is used to stir and mix the powder, the modified slurry, the additive solution and water to obtain a mixed slurry, wherein the particle size of the powder is smaller than the particle size of the particles in the modified slurry; A buffer tank, the buffer tank is used to receive the mixed slurry and detect the concentration of the mixed slurry in the buffer tank; A storage tank is used to receive and store the mixed slurry in the buffer tank when the concentration of the mixed slurry in the buffer tank is within a target slurry concentration range.

10. The device for preparing instant gasification slurry using solid waste according to claim 9, characterized in that: The mixer comprises an atomizing nozzle, which is arranged at the inlet of the mixer and has an angle with the vertical plane so as to spray atomized water into the mixer.

Images