Pulping system and pulping equipment

Abstract

The utility model belongs to the technical field of pulping, and particularly relates to a pulping system and pulping equipment. The pulping system comprises a pulping main machine, a powder hopper, a circulation tank, a powder inlet pipeline, a liquid inlet pipeline, a backflow pipeline and a flushing bypass, the powder inlet pipeline is connected with a powder outlet of the powder hopper and a powder inlet of the pulping main machine, and the liquid inlet pipeline is connected with a first liquid outlet of the circulation tank and a second liquid inlet of the pulping main machine. The powder material and the liquid material are mixed in the pulping main machine to form slurry; the backflow pipeline is connected with a second liquid outlet of the pulping main machine and a first liquid inlet of the circulation tank, and the pulping main machine, the backflow pipeline, the circulation tank and the liquid inlet pipeline jointly form a circulation loop; the flushing bypass is arranged outside the pulping main machine and connected with the powder inlet pipeline and the circulation loop, a first control valve is connected to the flushing bypass, and pulp can flow into the powder inlet pipeline when the first control valve is opened. The slurry is used for washing powder and kneaded materials which are remained on the pipe wall of the powder inlet pipeline, so that the powder and the kneaded materials are prevented from being accumulated at the powder inlet to form cakes.

Description

Technical Field

[0001] The utility model belongs to the technical field of pulping, and particularly relates to a pulping system and pulping equipment. Background Art

[0002] Existing pulping equipment includes a hopper, a powder-liquid mixing device and a circulation tank. The powder-liquid mixing device includes a pulping main machine and a mixing structure arranged in the pulping main machine. The pulping main machine is provided with a powder inlet, a second liquid inlet and a second liquid outlet. The circulation tank is provided with a first liquid outlet and a first liquid inlet. The powder outlet of the hopper and the powder inlet of the pulping main machine are communicated through a powder inlet pipeline. The first liquid outlet of the circulation tank and the second liquid inlet of the pulping main machine are communicated through a liquid inlet pipeline. The second liquid outlet of the pulping main machine and the first liquid inlet of the circulation tank are communicated through a reflux pipeline. In the initial state, the hopper inputs a fixed amount of powder into the pulping main machine through the powder inlet pipeline, the circulation tank inputs a fixed amount of liquid material into the pulping main machine through the liquid inlet pipeline, the mixing structure mixes and stirs the powder and the liquid material for a certain time to make a slurry, the slurry enters the circulation tank through the reflux pipeline, and then re-enters the pulping main machine through the liquid inlet pipeline for stirring. After the slurry is processed through multiple cycles, the powder-liquid mixing is more uniform.

[0003] However, the powder and the kneaded product formed by the powder and the liquid material are prone to accumulate and caking at the powder inlet of the pulping main machine. Moreover, the accumulated and caked powder is difficult to be completely infiltrated by the liquid material, and even if it enters the pulping main machine, it will affect the powder infiltration and mixing effect and the uniformity of the slurry. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a pulping system and pulping equipment for the problem that the powder and the kneaded product are prone to accumulate and caking at the powder inlet of the pulping main machine in the existing pulping equipment.

[0005] To solve the above technical problem, on the one hand, an embodiment of the utility model provides a pulping system, including a pulping main machine, a powder hopper, a circulation tank, a powder inlet pipeline, a liquid inlet pipeline, a reflux pipeline and a flushing bypass. The powder inlet pipeline connects the powder outlet of the powder hopper and the powder inlet of the pulping main machine. The liquid inlet pipeline connects the first liquid outlet of the circulation tank and the second liquid inlet of the pulping main machine. The powder in the powder hopper and the liquid material in the circulation tank are mixed in the pulping main machine to form a slurry. The reflux pipeline connects the second liquid outlet of the pulping main machine and the first liquid inlet of the circulation tank. The pulping main machine, the reflux pipeline, the circulation tank and the liquid inlet pipeline jointly form a circulation loop for the slurry to flow.

[0006] The flushing bypass is arranged outside the main pulp making machine and connects the powder feeding pipeline and the circulation loop. A first control valve is connected to the flushing bypass. The pulp in the circulation loop can flow into the powder feeding pipeline through the flushing bypass when the first control valve is opened.

[0007] Optionally, the flushing bypass has a first end and a second end oppositely arranged along its extending direction. A second control valve is connected to the powder feeding pipeline. The position where the first end of the flushing bypass is connected to the powder feeding pipeline is downstream of the second control valve. The second end of the flushing bypass is connected to the circulation loop.

[0008] Optionally, the second end of the flushing bypass is connected to the liquid inlet pipeline.

[0009] Optionally, a third control valve is connected to the liquid inlet pipeline. The position where the second end of the flushing bypass is connected to the liquid inlet pipeline is upstream of the third control valve.

[0010] Optionally, the first control valve is a three-way valve. The three-way valve is installed on the liquid inlet pipeline. The three-way valve has one inlet and two outlets. The inlet communicates with the circulation tank. One of the outlets communicates with the main pulp making machine. The second end of the flushing bypass is connected to the other outlet.

[0011] Optionally, the second end of the flushing bypass is connected to the reflux pipeline.

[0012] Optionally, a fourth control valve is connected to the reflux pipeline. The position where the second end of the flushing bypass is connected to the reflux pipeline is downstream of the fourth control valve.

[0013] Optionally, the first control valve is a three-way valve. The three-way valve is installed on the reflux pipeline. The three-way valve has one inlet and two outlets. The inlet communicates with the main pulp making machine. One of the outlets communicates with the circulation tank. The second end of the flushing bypass is connected to the other outlet.

[0014] Optionally, the circulation tank is located directly above the main pulp making machine. The first liquid outlet is arranged on the bottom wall of the circulation tank. The second liquid inlet is arranged on the top wall of the main pulp making machine. The liquid inlet pipeline extends vertically.

[0015] Optionally, the first liquid inlet is arranged on the side wall of the circulation tank. The reflux pipeline includes a first reflux section and a second reflux section connected to the first reflux section. At least one of the first reflux section and the second reflux section extends upward.

[0016] Optionally, the powder hopper is located obliquely above the main pulp making machine. The powder feeding pipeline extends obliquely upward.

[0017] Optionally, the powder feeding pipeline extends in an upward direction towards a side away from the circulation tank, and the flushing bypass connects one end of the powder feeding pipeline near the powder inlet.

[0018] On the other hand, an embodiment of the present invention provides a pulping device, including the above-mentioned pulping system.

[0019] In the pulping device of the present invention, the powder in the powder hopper is fed into the pulping main machine through the powder outlet and the powder feeding pipeline, and the liquid material in the circulation tank flows into the pulping main machine through the first liquid outlet and the liquid feeding pipeline. The slurry formed by mixing the powder and the liquid material in the pulping main machine can flow from the second liquid outlet through the reflux pipeline to the circulation tank, and then flow back to the pulping main machine through the liquid feeding pipeline, forming a circulation loop for the slurry to flow. When the first control valve is opened, the flushing bypass connects the circulation loop and the powder feeding pipeline, and the slurry in the circulation loop can flow through the flushing bypass and into the powder feeding pipeline to flush the powder and the kneaded material remaining on the inner wall of the powder feeding pipeline during powder feeding, avoiding the accumulation of the powder and the kneaded material at the powder inlet to form lumps. Moreover, the slurry flowing in the powder feeding pipeline can also infiltrate the lumps formed by the accumulation of the powder and the kneaded material at the powder inlet, so as to avoid affecting the powder infiltration effect and the uniformity of the slurry after the lumps fall into the pulping main machine. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the pulping device provided by the first embodiment of the present invention;

[0021] Figure 2 is Figure 1 a side view of

[0022] Figure 3 is Figure 1 a schematic diagram of the pulping system in

[0023] Figure 4 is a schematic structural diagram of the pulping device provided by the second embodiment of the present invention;

[0024] Figure 5 is Figure 4 a side view of

[0025] Figure 6 is Figure 1 a schematic diagram of the pulping system in

[0026] Figure 7 is Figure 1 a schematic structural diagram of the pulping main machine in

[0027] The reference numerals in the specification are as follows:

[0028] 1. Powder hopper; 2. Circulation tank; 3. Pulp making main machine; 31. Pulp making cylinder; 32. Rotor; 33. Stator; 34. Mixing cavity; 35. Powder inlet; 36. Second liquid inlet; 37. Second liquid outlet; 38. Rotating shaft; 4. Flushing bypass; 5. Powder inlet pipeline; 6. Liquid inlet pipeline; 7. Return pipeline; 71. First return section; 72. Second return section; 8. First control valve; 9. Second control valve; 10. Third control valve; 11. Fourth control valve. Detailed implementation manners

[0029] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0030] As Figure 1 and Figure 2 shown, the first embodiment of the present utility model provides a pulp making device, including a pulp making system. The pulp making system includes a pulp making main machine 3, a powder hopper 1, a circulation tank 2, a powder inlet pipeline 5, a liquid inlet pipeline 6, a return pipeline 7 and a flushing bypass 4. The powder inlet pipeline 5 connects the powder outlet of the powder hopper 1 and the powder inlet 35 of the pulp making main machine 3. The liquid inlet pipeline 6 connects the first liquid outlet of the circulation tank 2 and the second liquid inlet 36 of the pulp making main machine 3. The powder in the powder hopper 1 and the liquid material in the circulation tank 2 are mixed in the pulp making main machine 3 to form a pulp. The return pipeline 7 connects the second liquid outlet 37 of the pulp making main machine 3 and the first liquid inlet of the circulation tank 2. The pulp making main machine 3, the return pipeline 7, the circulation tank 2 and the liquid inlet pipeline 6 together form a circulation loop for the pulp to flow.

[0031] As Figure 3 shown, the flushing bypass 4 is arranged outside the pulp making main machine 3 and is connected to the powder inlet pipeline 5 and the circulation loop. A first control valve 8 is connected to the flushing bypass 4. The pulp in the circulation loop can flow to the powder inlet pipeline 5 through the flushing bypass 4 when the first control valve 8 is opened.

[0032] It should be noted that a mixing structure is arranged in the pulp making main machine 3. The mixing structure is used to shear the powder and liquid material in the pulp making main machine 3 at a high speed, so that the powder is mixed into the liquid to form a pulp.

[0033] Specifically, in the initial state, the first control valve 8 connected to the flushing bypass 4 is closed. After the pulping starts, a fixed amount of powder in the powder hopper 1 is fed into the pulping main machine 3 through the powder feeding pipeline 5, and a fixed amount of liquid material in the circulation tank 2 flows into the pulping main machine 3 through the liquid feeding pipeline 6. The mixing structure mixes and stirs the powder and liquid material in the pulping main machine 3 to obtain a slurry. The slurry flows from the second liquid outlet 37 through the reflux pipeline 7 to the circulation tank 2, and then flows back into the pulping main machine 3 from the first liquid outlet of the circulation tank 2 through the liquid feeding pipeline 6 for stirring again. Therefore, the liquid feeding pipeline 6, the pulping main machine 3, the reflux pipeline 7, and the circulation tank 2 together form a circulation loop for the slurry to flow. After the slurry circulates multiple times in the circulation loop, a slurry with more uniform powder-liquid mixing is obtained.

[0034] During the circulation of the slurry, the first control valve 8 can be opened after the powder in the powder hopper 1 has been completely fed. The flushing bypass 4 connects the powder feeding pipeline 5 and the circulation loop, and the slurry in the circulation loop flows into the powder feeding pipeline 5 through the flushing bypass 4 to flush the powder and the kneaded material remaining on the inner wall of the powder feeding pipeline 5 during powder feeding, so that they flow into the pulping main machine 3 from the powder inlet 35, avoiding the accumulation of powder and the kneaded material at the powder inlet 35 to form lumps. Moreover, the slurry flowing in the powder feeding pipeline 5 can also infiltrate the lumps formed by the accumulation of powder and the kneaded material at the powder inlet 35, so as to avoid the lumps falling into the pulping main machine 3 and affecting the powder infiltration effect and the uniformity of the slurry.

[0035] In the pulping equipment of the present utility model, the powder in the powder hopper 1 is fed into the pulping main machine 3 from the powder outlet through the powder feeding pipeline 5, and the liquid material in the circulation tank 2 flows into the pulping main machine 3 through the first liquid outlet and the liquid feeding pipeline 6. The slurry formed by mixing the powder and the liquid material in the pulping main machine 3 can flow from the second liquid outlet 37 through the reflux pipeline 7 to the circulation tank 2, and then flow back into the pulping main machine 3 through the liquid feeding pipeline 6, forming a circulation loop for the slurry to flow. After the first control valve 8 is opened, the flushing bypass 4 connects the circulation loop and the powder feeding pipeline 5, and the slurry in the circulation loop flows through the flushing bypass 4 and into the powder feeding pipeline 5 to flush the powder and the kneaded material remaining on the inner wall of the powder feeding pipeline 5 during powder feeding, avoiding the accumulation of powder and the kneaded material at the powder inlet 35 to form lumps. Moreover, the slurry flowing in the powder feeding pipeline 5 can also infiltrate the lumps formed by the accumulation of powder and the kneaded material at the powder inlet 35, so as to avoid the lumps falling into the pulping main machine 3 and affecting the powder infiltration effect and the uniformity of the slurry.

[0036] In one embodiment, as Figure 1 and Figure 7As shown in the figure, the main pulping machine 3 includes a pulping cylinder 31 and a mixing structure. The mixing structure is installed inside the pulping cylinder 31. A mixing chamber 34 is formed at the position of the mixing structure inside the pulping cylinder 31. The powder inlet 35, the second liquid inlet 36, and the second liquid outlet 37 are arranged on the pulping cylinder 31 and communicate with the mixing chamber 34. To facilitate the transportation of powder into the mixing chamber 34, the powder inlet 35 is arranged close to the mixing structure.

[0037] The mixing structure includes a stator 33 and a rotor 32 that can rotate relative to the stator 33. The stator 33 is fixed on the pulping cylinder 31. A rotatable shaft 38 is installed inside the pulping cylinder 31, and the rotor 32 is connected to the shaft 38.

[0038] During pulping, the powder and the liquid material are mixed inside the mixing chamber 34. The rotor 32 rotates following the shaft 38 to stir and mix the powder and the liquid material, thereby obtaining the pulp.

[0039] Since the powder inlet 35 is arranged close to the mixing structure, during the pulping process, when the water vapor inside the mixing chamber 34 evaporates, it is easy to wet the pipe wall of the powder inlet pipeline 5 and the powder at the powder inlet 35, resulting in easy extrusion and caking. Moreover, when the rotating rotor 32 stirs and mixes the powder and the liquid material, the kneaded material formed by the liquid material and the powder is easy to splash onto the pipe wall of the powder inlet pipeline 5 and the powder inlet 35 to form accumulation and caking. Therefore, in this application, a flushing bypass 4 is provided to flush the pipe wall of the powder inlet pipeline 5 and the powder inlet 35 to remove the caking.

[0040] In one embodiment, the flushing bypass 4 has a first end and a second end arranged oppositely along its extending direction. A second control valve 9 is connected to the powder inlet pipeline 5. The position where the first end of the flushing bypass 4 is connected to the powder inlet pipeline 5 is located downstream of the second control valve 9, and the second end of the flushing bypass 4 is connected to a circulation loop. The so-called "downstream" refers to the side close to the powder inlet 35 of the main pulping machine 3 in the powder feeding direction inside the powder inlet pipeline 5.

[0041] When the powder hopper 1 needs to feed powder into the main pulping machine 3, the second control valve 9 is opened, the powder inlet pipeline 5 connects the powder outlet of the powder hopper 1 and the powder inlet 35 of the main pulping machine 3, and the powder in the powder hopper 1 normally feeds into the main pulping machine 3 through the powder inlet pipeline 5.

[0042] When it is necessary to flush the powder inlet 35 with the pulp, the second control valve 9 is closed to cut off the powder hopper 1 and the flushing bypass 4 to prevent the pulp from flowing to the powder hopper 1 and affecting the subsequent use of the powder hopper 1.

[0043] In other embodiments, the second control valve 9 can be cancelled, and the height of the powder hopper 1 can be increased to prevent the pulp flowing out of the flushing bypass 4 from flowing to the powder hopper 1.

[0044] In one embodiment, the second end of the flushing bypass 4 is connected to the liquid inlet pipeline 6. During the slurry circulation process, the slurry flowing from the first liquid outlet of the circulation tank 2 through the liquid inlet pipeline 6 to the second liquid inlet 36 of the pulping main machine 3 can flow into the flushing bypass 4, thereby flushing the residual powder and kneaded matter on the powder inlet pipeline 5.

[0045] In one embodiment, a third control valve 10 is connected to the liquid inlet pipeline 6. The position where the second end of the flushing bypass 4 is connected to the liquid inlet pipeline 6 is located upstream of the third control valve 10, and the third control valve 10 controls the on-off of the liquid inlet pipeline 6. The so-called "upstream" refers to the side closer to the source in the flow direction of the slurry in the liquid inlet pipeline 6, that is, the side closer to the first liquid outlet of the circulation tank 2.

[0046] When the third control valve 10 is opened and the first liquid outlet of the circulation tank 2 and the second liquid inlet 36 of the pulping main machine 3 are connected, the slurry flowing out from the outlet of the circulation tank 2 is divided into two paths. One path flows into the pulping main machine 3 to continue stirring and processing, and the other path flows into the flushing bypass 4 to flush the powder inlet pipeline 5 and then flows into the pulping main machine 3 for stirring and processing, so as to carry out pulping and flushing work simultaneously.

[0047] When the third control valve 10 is closed and the first liquid outlet of the circulation tank 2 and the second liquid inlet 36 of the pulping main machine 3 are disconnected, since the second end of the flushing bypass 4 is located on the side of the third control valve 10 closer to the first liquid outlet of the circulation tank 2, all the slurry flowing out from the first liquid outlet of the circulation tank 2 flows into the flushing bypass 4 to flush the powder inlet pipeline 5. At this time, all the slurry flowing out from the circulation tank 2 is used for flushing work, and the flow rate of the slurry used to flush the powder inlet pipeline 5 is relatively large, and the flushing effect is better.

[0048] In one embodiment, the circulation tank 2 is located directly above the pulping main machine 3. The first liquid outlet is arranged on the bottom wall of the circulation tank 2, and the second liquid inlet 36 is arranged on the top wall of the pulping main machine 3. The liquid inlet pipeline 6 extends vertically, so that the liquid can flow into the pulping main machine 3 under the action of its own weight.

[0049] In one embodiment, the first liquid inlet is arranged on the side wall of the circulation tank 2. The return pipeline 7 includes a first return section 71 and a second return section 72 connected to the first return section 71. At least one of the first return section 71 and the second return section 72 extends upward.

[0050] In one embodiment, the first return section 71 extends obliquely upward, the second return section 72 extends vertically upward, the top end of the first return section 71 is connected to the bottom end of the second return section 72, the bottom end of the first return section 71 is connected to the second liquid outlet 37 of the pulping main machine 3, and the top end of the second return section 72 is communicated with the first liquid inlet.

[0051] In other embodiments, the first return section 71 may extend horizontally, and the second return section 72 may extend vertically.

[0052] In other embodiments, the first liquid inlet can be arranged on the top wall of the circulation tank 2.

[0053] In one embodiment, the powder hopper 1 is located obliquely above the pulping main machine 3, and the powder feeding pipeline 5 extends obliquely upward, so that the powder can be fed to the pulping main machine 3 under the action of gravity.

[0054] In one embodiment, the powder feeding pipeline 5 extends in an upward direction toward the side away from the circulation tank 2, and the flushing bypass 4 is connected to one end of the powder feeding pipeline 5 near the powder inlet 35, that is, the first end of the flushing bypass 4 is close to the powder inlet 35.

[0055] Since the powder feeding pipeline 5 extends in an upward direction toward the side away from the circulation tank 2, when the first end of the flushing bypass 4 is close to the powder inlet 35, the first end of the flushing bypass 4 is closer to the reflux pipeline 7 and the vertically extending liquid inlet pipeline 6, so as to reduce the length of the flushing bypass 4, thereby shortening the flow path and flow time of the slurry in the flushing bypass 4 and the powder feeding pipeline 5 and improving the flushing efficiency.

[0056] It should be noted that for the pulping equipment presented in the drawings, when the positional relationship of the reflux pipeline 7, the liquid inlet pipeline 6, and the powder feeding pipeline 5 makes both the first end and the second end of the flushing bypass 4 close to the pulping main machine 3, the length of the flushing bypass 4 is shorter.

[0057] However, in actual application scenarios, the positional relationship of the reflux pipeline 7, the liquid inlet pipeline 6, and the powder feeding pipeline 5 may be adjusted due to other factors, resulting in a longer length of the flushing bypass 4 when the first end and the second end of the flushing bypass 4 are arranged close to the pulping main machine 3. At this time, it is necessary to adjust the positions of the first end and the second end of the flushing bypass 4 according to the actual positional relationship of the reflux pipeline 7, the liquid inlet pipeline 6, and the powder feeding pipeline 5 to minimize the length of the flushing bypass 4 as much as possible.

[0058] In other embodiments, the first control valve 8 is a three-way valve, the three-way valve is installed on the liquid inlet pipeline 6, the three-way valve has one inlet and two outlets, the inlet communicates with the circulation tank 2, one of the outlets communicates with the pulping main machine 3, and the second end of the flushing bypass 4 is connected to the other outlet, and the on-off of the slurry flowing out of the circulation tank 2 to the flushing bypass 4 and the pulping main machine 3 is controlled by the three-way valve.

[0059] In other embodiments, the positions of the powder hopper 1 and the circulation tank 2 can be changed according to requirements. For example, the powder hopper 1 is arranged directly above the pulping main machine 3, the circulation tank 2 is arranged obliquely above the pulping main machine 3, or both the powder hopper 1 and the circulation tank 2 are arranged obliquely above the pulping main machine 3.

[0060] Such as Figures 4 to 6As shown in the figure, the second embodiment of the present utility model further provides a pulping device. The difference between this pulping device and the pulping device of the first embodiment is that the second end of the flushing bypass 4 is connected to the reflux pipeline 7.

[0061] After the powder in the powder hopper 1 has finished feeding, when the slurry flowing out from the second liquid outlet 37 of the pulping main machine 3 flows through the reflux pipeline 7 to the first liquid inlet of the circulation tank 2, since the second end of the flushing bypass 4 is connected to the reflux pipeline 7, the slurry can flow into the flushing bypass 4 to flush the residual powder and kneaded matter on the pipe wall of the powder feeding pipeline 5 during powder feeding.

[0062] In one embodiment, as Figures 4 to 6 shown, a fourth control valve 11 is connected to the reflux pipeline 7, and the position where the second end of the flushing bypass 4 is connected to the reflux pipeline 7 is located downstream of the fourth control valve 11. The so-called "downstream" refers to the side closer to the first liquid inlet of the circulation tank 2 in the flow direction of the slurry in the reflux pipeline 7.

[0063] When the fourth control valve 11 is opened, the slurry flowing out from the second liquid outlet 37 of the pulping main machine 3 is divided into two paths. One path flows to the first liquid inlet of the circulation tank 2, and then flows back into the pulping main machine 3 through the liquid inlet pipeline 6 from the first liquid outlet of the circulation tank 2 for further processing. The other path flows into the flushing bypass 4 and then flows into the pulping main machine 3 for further processing after flushing the powder feeding pipeline 5, and the pulping and flushing work are carried out simultaneously.

[0064] Since the position where the second end of the flushing bypass 4 is connected to the reflux pipeline 7 is located downstream of the fourth control valve 11, closing the fourth control valve 11 can cut off the circuits flowing from the second liquid outlet 37 of the pulping main machine 3 to the flushing bypass 4 and the circulation tank 2 simultaneously.

[0065] In other embodiments, the position where the second end of the flushing bypass 4 is connected to the reflux pipeline 7 can be located upstream of the fourth control valve 11. At this time, when the fourth control valve 11 is closed, only the circuit flowing from the second liquid outlet 37 of the pulping main machine 3 to the circulation tank 2 can be cut off, and the slurry flowing out from the second liquid outlet 37 of the pulping main machine 3 will still flow into the flushing bypass 4 to flush the powder feeding pipeline 5, and it is necessary to close the first control valve 8 to stop flushing.

[0066] In one embodiment, the pulping main machine 3 is a pulping main machine in a negative pressure powder-liquid mixing device.

[0067] In other embodiments, the first control valve 8 is a three-way valve. The three-way valve is installed on the reflux pipeline 7. The three-way valve has one inlet and two outlets. The inlet is connected to the pulping main machine 3. One of the outlets is connected to the circulation tank 2, and the second end of the flushing bypass 4 is connected to the other outlet to control the on-off of the slurry flowing out from the pulping main machine 3 to the flushing bypass 4 and the circulation tank 2 through the three-way valve.

[0068] In addition, an embodiment of the present utility model provides a pulping system, the structure of which is the same as that of the pulping system in the pulping equipment in any of the above embodiments, and will not be described in detail herein.

[0069] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A pulping system, characterized in that: The invention comprises a pulping main machine (3), a powder hopper (1), a circulation tank (2), a powder inlet pipeline (5), a liquid inlet pipeline (6), a return pipeline (7) and a flushing bypass (4), wherein the powder inlet pipeline (5) is connected to the powder outlet of the powder hopper (1) and the powder inlet (35) of the pulping main machine (3), the liquid inlet pipeline (6) is connected to the first liquid outlet of the circulation tank (2) and the second liquid inlet (36) of the pulping main machine (3), and the powder in the powder hopper (1) and the liquid in the circulation tank (2) are mixed in the pulping main machine (3) to form pulp; the return pipeline (7) is connected to the second liquid outlet (37) of the pulping main machine (3) and the first liquid inlet of the circulation tank (2), and the pulping main machine (3), the return pipeline (7), the circulation tank (2) and the liquid inlet pipeline (6) together form a circulation loop for the pulp to flow; The flushing bypass (4) is arranged outside the pulping main machine (3) and is connected to the powder inlet pipeline (5) and the circulation loop. The flushing bypass (4) is connected to a first control valve (8). When the first control valve (8) is opened, the slurry in the circulation loop can flow into the powder inlet pipeline (5) through the flushing bypass (4).

2. The pulping system according to claim 1, characterized in that: The flushing bypass (4) has a first end and a second end which are arranged opposite to each other along its extension direction; the powder inlet pipeline (5) is connected to a second control valve (9); the position of the first end of the powder inlet pipeline (5) connected to the flushing bypass (4) is located downstream of the second control valve (9); and the second end of the flushing bypass (4) is connected to the circulation loop.

3. The pulping system according to claim 2, characterized in that: The second end of the flushing bypass (4) is connected to the liquid inlet pipeline (6).

4. The pulping system according to claim 3, characterized in that: The liquid inlet pipeline (6) is connected to a third control valve (10), and the position of the second end of the liquid inlet pipeline (6) connected to the flushing bypass (4) is located upstream of the third control valve (10).

5. The pulping system according to claim 3, characterized in that: The first control valve (8) is a three-way valve, which is installed on the liquid inlet pipeline (6). The three-way valve has an inlet and two outlets, the inlet is connected to the circulation tank (2), one of the outlets is connected to the pulping main machine (3), and the second end of the flushing bypass (4) is connected to the other outlet.

6. The pulping system according to claim 2, characterized in that: The second end of the flushing bypass (4) is connected to the return pipeline (7).

7. The pulping system according to claim 6, characterized in that: The return line (7) is connected to a fourth control valve (11), and the position of the second end of the return line (7) connected to the flushing bypass (4) is located downstream of the fourth control valve (11).

8. The pulping system according to claim 6, characterized in that: The first control valve (8) is a three-way valve, which is installed on the return pipeline (7). The three-way valve has an inlet and two outlets, the inlet is connected to the pulping main machine (3), one of the outlets is connected to the circulation tank (2), and the second end of the flushing bypass (4) is connected to the other outlet.

9. The pulping system according to any one of claims 1 to 8, characterized in that: The circulation tank (2) is located directly above the pulping main machine (3), the first liquid outlet is arranged on the bottom wall of the circulation tank (2), the second liquid inlet (36) is arranged on the top wall of the pulping main machine (3), and the liquid inlet pipeline (6) extends vertically.

10. The pulping system according to claim 9, characterized in that: The first liquid inlet is arranged on the side wall of the circulation tank (2), the reflux pipeline (7) comprises a first reflux section (71) and a second reflux section (72) connected to the first reflux section (71), and at least one of the first reflux section (71) and the second reflux section (72) extends upward.

11. The pulping system according to claim 10, characterized in that: The powder hopper (1) is located obliquely above the pulping main machine (3), and the powder inlet pipeline (5) extends obliquely upward.

12. The pulping system according to claim 11, characterized in that: The powder inlet pipeline (5) extends in an upward direction toward a side away from the circulation tank (2), and the flushing bypass (4) is connected to one end of the powder inlet pipeline (5) close to the powder inlet port (35).

13. A pulping device, characterized in that: Comprising a pulping system as claimed in any one of claims 1 to 12.

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