White cardboard repulping system and white cardboard pulp preparing system

Abstract

The utility model relates to an ivory board pulping system and an ivory board pulp preparing system, and the ivory board pulping system comprises a first pulper in a first spare part system and a second pulper in a second spare part system, the first pulper, the first discharge pump and the first discharge tower are arranged in the first pulp preparation system, the second pulper, the second discharge pump and the second discharge tower are arranged in the second pulp preparation system, and the third pulper, the third discharge pump and the third discharge tower are arranged in the third pulp preparation system. The white cardboard pulping system is formed by the pulpers of the first pulp preparation system, the second pulp preparation system and the third pulp preparation system, and when one of the pulpers breaks down, the other pulpers can be switched through the first valve unit or the second valve unit to replace the broken pulp. The situation that pulp is tight or broken in the pulp preparation system with the fault pulper is avoided, and then the situation that paper quality fluctuates and production halts is avoided, so that the operation efficiency of a paper machine is improved.

Description

Technical Field

[0001] The present application relates to the technical field of papermaking, and in particular to a white cardboard pulping system and a white cardboard pulping system. Background Art

[0002] At present, the raw materials used for white cardboard include coniferous pulp (long fiber), broadleaf pulp (short fiber), chemical mechanical pulp, such as Figure 1-3 As shown in the figure, there are three existing pulpers, namely the long fiber pulper in the long fiber pulping system, the short fiber pulper in the short fiber pulping system and the chemical mechanical pulp pulper in the chemical mechanical pulping system; however, these three pulpers are independent of each other, the pulp after pulping by the long fiber pulper can only go to the long fiber unloading tower, the pulp after pulping by the short fiber pulper can only go to the short fiber unloading tower, and the pulp after pulping by the chemical mechanical pulp pulper can only go to the chemical mechanical pulp unloading tower. The long fiber pulping system, the short fiber pulping system and the chemical mechanical pulping system are independent systems. However, when any of the three pulping systems fails, the pulping system where the failed pulper is located will experience pulp tension or pulp breakage; and pulp tension or pulp breakage will cause fluctuations in paper quality, paper machine shutdown, reduced operating efficiency, inferior products, and increased costs. Utility Model Content

[0003] In view of the above problems, the present application provides a white cardboard pulping system and a white cardboard pulping preparation system to solve the problem that the existing long fiber pulping system, short fiber pulping system and chemical mechanical pulping system are independent of each other. When the pulper of one of the pulping systems fails, the pulping system will have pulp tension or pulp breakage problems.

[0004] To achieve the above object, the inventor provides a white cardboard pulping system, comprising:

[0005] A first pulper, wherein the first pulper is a pulper in a long fiber pulping system, a short fiber pulping system, or a chemical mechanical pulping system;

[0006] a first unloading pump, wherein a pulp inlet of the first unloading pump is connected to a pulp outlet of the first pulper;

[0007] A first unloading tower, wherein a slurry inlet of the first unloading tower is connected to a slurry outlet of the first unloading pump, and a first slurry inlet valve is provided in front of the slurry inlet of the first unloading tower;

[0008] A second pulper, wherein the second pulper is a pulper in a long fiber pulping system, a short fiber pulping system, or a chemical mechanical pulping system;

[0009] a second unloading pump, wherein the pulp inlet of the second unloading pump is connected to the pulp outlet of the second pulper;

[0010] A second unloading tower, wherein the second unloading tower is connected to the slurry outlet of the second unloading pump, and a second slurry inlet valve is provided in front of the slurry inlet of the second unloading tower;

[0011] a first valve unit, wherein one end of the first valve unit is connected to the first unloading pump, and the other end of the first valve unit is connected to the slurry inlet of the second unloading tower;

[0012] A third pulper, wherein the third pulper is a pulper in a long fiber pulping system, a short fiber pulping system, or a chemical mechanical pulping system, and the third pulper, the second pulper, and the first pulper are pulpers of different pulping systems;

[0013] a third unloading pump, wherein the pulp inlet of the third unloading pump is connected to the pulp outlet of the third pulper;

[0014] A third unloading tower, wherein the slurry inlet of the third unloading tower is connected to the slurry outlet of the third unloading pump, and a third slurry inlet valve is provided in front of the slurry inlet of the third unloading tower;

[0015] A second valve unit, one end of the second valve unit is connected to the slurry outlet of the third unloading pump, and the other end of the second valve unit is connected to the slurry inlet of the second unloading tower.

[0016] In some embodiments, it also includes:

[0017] A third valve unit, one end of the third valve unit is connected to the slurry outlet of the first unloading pump, and the other end of the third valve unit is connected to the slurry inlet of the third unloading tower.

[0018] In some embodiments, the first valve unit, the second valve unit and the third valve unit are each composed of two valves.

[0019] In some embodiments, it also includes:

[0020] A DCS control system is connected to the control ends of the first valve unit, the second valve unit and the third valve unit.

[0021] In some embodiments, the slurry outlet of the first unloading pump is provided with a first slurry outlet valve;

[0022] The slurry outlet of the second unloading pump is provided with a second slurry outlet valve;

[0023] The slurry outlet of the third unloading pump is provided with a third slurry outlet valve.

[0024] Another technical solution is also provided, a white cardboard stock preparation system, comprising a first stock preparation system, a second stock preparation system, a third stock preparation system, a first valve unit and a second valve unit;

[0025] The first stock preparation system is a long fiber stock preparation system or a short fiber stock preparation system or a chemical mechanical pulp preparation system, and the first stock preparation system includes:

[0026] First pulper;

[0027] a first unloading pump, wherein a pulp inlet of the first unloading pump is connected to a pulp outlet of the first pulper;

[0028] A first unloading tower, wherein a slurry inlet of the first unloading tower is connected to a slurry outlet of the first unloading pump, and a first slurry inlet valve is provided in front of the slurry inlet of the first unloading tower;

[0029] The second stock preparation system is a long fiber stock preparation system or a short fiber stock preparation system or a chemical mechanical pulp preparation system, and the second stock preparation system includes:

[0030] Second pulper;

[0031] a second unloading pump, wherein the pulp inlet of the second unloading pump is connected to the pulp outlet of the second pulper;

[0032] A second unloading tower, wherein the second unloading tower is connected to the slurry outlet of the second unloading pump, and a second slurry inlet valve is provided in front of the slurry inlet of the second unloading tower;

[0033] a first valve unit, wherein one end of the first valve unit is connected to the first unloading pump, and the other end of the first valve unit is connected to the slurry inlet of the second unloading tower;

[0034] The third stock preparation system is a long fiber stock preparation system or a short fiber stock preparation system or a chemical mechanical pulp preparation system. The third stock preparation system, the second stock preparation system and the first stock preparation system are different stock preparation systems. The third stock preparation system includes:

[0035] The third pulper;

[0036] a third unloading pump, wherein the pulp inlet of the third unloading pump is connected to the pulp outlet of the third pulper;

[0037] A third unloading tower, wherein the slurry inlet of the third unloading tower is connected to the slurry outlet of the third unloading pump, and a third slurry inlet valve is provided in front of the slurry inlet of the third unloading tower;

[0038] A second valve unit, one end of the second valve unit is connected to the slurry outlet of the third unloading pump, and the other end of the second valve unit is connected to the slurry inlet of the second unloading tower.

[0039] In some embodiments, it also includes:

[0040] A third valve unit, one end of the third valve unit is connected to the slurry outlet of the first unloading pump, and the other end of the third valve unit is connected to the slurry inlet of the third unloading tower.

[0041] In some embodiments, the first valve unit, the second valve unit and the third valve unit are each composed of two valves.

[0042] In some embodiments, it also includes:

[0043] A DCS control system is connected to the control ends of the first valve unit, the second valve unit and the third valve unit.

[0044] In some embodiments, the slurry outlet of the first unloading pump is provided with a first slurry outlet valve;

[0045] The slurry outlet of the second unloading pump is provided with a second slurry outlet valve;

[0046] The slurry outlet of the third unloading pump is provided with a third slurry outlet valve.

[0047] Different from the prior art, the above technical scheme forms a white cardboard pulping system by combining the pulpers of the long fiber pulping system, the short fiber pulping system and the chemical-mechanical pulping system. When one of the pulpers fails, it can be switched to other pulpers to replace the failed pulper. For example, when the first pulper fails, the first pulper can be switched to the second pulper through the first valve unit, or switched to the third pulper through the first valve unit and the second valve unit. After the required pulp is pulped by the second pulper, the pulp pulped by the second pulper is sent to the first unloading tower through the second unloading pump and the first valve unit, and the pulp pulped by the third pulper is sent through the third unloading pump. The first valve unit and the second valve unit are sent to the first unloading tower to ensure that the pulp preparation system where the first pulper is located can supply pulp normally. Similarly, when the second pulper fails, the first valve unit can be used to switch to the first pulper or the second valve unit can be used to switch to the third pulper. The required pulp is pulped by the first pulper or the third pulper and then sent to the second unloading tower to ensure that the pulp preparation system where the second pulper is located can supply pulp normally when the second pulper fails, and there will be no pulp tension or pulp breakage.

[0048] The above-mentioned records related to the content of the utility model are only an overview of the technical solution of the present application. In order to enable ordinary technicians in the field to more clearly understand the technical solution of the present application, and then implement it according to the text of the specification and the contents recorded in the drawings, and to make the above-mentioned purpose and other purposes, features and advantages of the present application easier to understand, the following is an explanation in combination with the specific implementation method and drawings of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The drawings are only used to illustrate the principles, implementation methods, applications, characteristics and effects of the specific embodiments of the present application and other related contents, and shall not be considered as limitations of the present application.

[0050] In the drawings of the specification:

[0051] Figure 1 A structural schematic diagram of the long fiber stock preparation system described in the background technology;

[0052] Figure 2 A structural schematic diagram of the short fiber stock preparation system described in the background technology;

[0053] Figure 3 A structural schematic diagram of a chemical mechanical pulp preparation system described in the background technology;

[0054] Figure 4 A structural schematic diagram of a white cardboard pulping system according to a specific implementation method;

[0055] Figure 5 Another structural schematic diagram of the white cardboard pulping system described in the specific implementation method;

[0056] Figure 6 Another structural schematic diagram of the white cardboard pulping system described in the specific implementation method;

[0057] Figure 7 It is a structural schematic diagram of the white cardboard stock preparation system described in the specific implementation method.

[0058] The reference numerals in the above drawings are described as follows:

[0059] 110. The first slurry preparation system;

[0060] 111. The first pulper,

[0061] 112. The first unloading pump,

[0062] 113. The first unloading tower,

[0063] 120. Second slurry preparation system;

[0064] 121. Second pulper,

[0065] 122. Second unloading pump,

[0066] 123. Second unloading tower,

[0067] 130. The third slurry preparation system;

[0068] 131. The third pulper,

[0069] 132. The third unloading pump,

[0070] 133. The third unloading tower,

[0071] 140. The first valve unit,

[0072] 150. Second valve unit. DETAILED DESCRIPTION

[0073] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0074] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0075] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0076] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.

[0077] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0078] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0079] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0080] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0081] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms such as "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0082] See also Figure 4-5 This embodiment provides a white cardboard pulping system, including:

[0083] A first pulper 111, wherein the first pulper 111 is a pulper in a long fiber pulp preparation system, a short fiber pulp preparation system, or a chemical mechanical pulp preparation system;

[0084] A first unloading pump 112, wherein a pulp inlet of the first unloading pump 112 is connected to a pulp outlet of the first pulper 111;

[0085] A first unloading tower 113, wherein a slurry inlet of the first unloading tower 113 is connected to a slurry outlet of the first unloading pump 112, and a first slurry inlet valve is provided in front of the slurry inlet of the first unloading tower 113;

[0086] A second pulper 121, wherein the second pulper 121 is a pulper in a long fiber pulp preparation system, a short fiber pulp preparation system, or a chemical mechanical pulp preparation system;

[0087] A second unloading pump 122, wherein the pulp inlet of the second unloading pump 122 is connected to the pulp outlet of the second pulper 121;

[0088] A second unloading tower 123, wherein the second unloading tower 123 is connected to the slurry outlet of the second unloading pump 122, and a second slurry inlet valve is provided in front of the slurry inlet of the second unloading tower 123;

[0089] A first valve unit 140, wherein one end of the first valve unit 140 is connected to the first unloading pump 112, and the other end of the first valve unit 140 is connected to the slurry inlet of the second unloading tower 123;

[0090] A third pulper 131, wherein the third pulper 131 is a pulper in a long fiber pulping system or a short fiber pulping system or a chemical-mechanical pulping system, and the third pulper 131, the second pulper 121 and the first pulper 111 are pulpers of different pulping systems;

[0091] A third unloading pump 132, wherein the pulp inlet of the third unloading pump 132 is connected to the pulp outlet of the third pulper 131;

[0092] A third unloading tower 133, wherein the slurry inlet of the third unloading tower 133 is connected to the slurry outlet of the third unloading pump 132, and a third slurry inlet valve is provided in front of the slurry inlet of the third unloading tower 133;

[0093] The second valve unit 150 , one end of the second valve unit 150 is connected to the slurry outlet of the third unloading pump 132 , and the other end of the second valve unit 150 is connected to the slurry inlet of the second unloading tower 123 .

[0094] A white cardboard pulping system is formed by pulping the pulpers of a long fiber pulping system, a short fiber pulping system and a chemical-mechanical pulping system. When one of the pulpers fails, the first valve unit 140 or the second valve unit 150 can be used to switch to other pulpers to replace the failed pulper, thereby avoiding pulp tension or pulp breakage in the pulping system where the pulper fails, thereby avoiding fluctuations in paper quality and production downtime, thereby improving the operating efficiency of the paper machine. If the first pulper 111 fails, the first valve unit 140 can be used to switch the first pulper 111 to the second pulper 121, and the required pulp is pulped by the second pulper 121 and then sent to the first unloading tower 113 through the second unloading pump 122 and the first valve unit 140, so as to ensure that the pulp preparation system where the first pulper 111 is located can supply pulp normally. Similarly, when the second pulper 121 fails, the first valve unit 140 can be used to switch to the first pulper 111 or the second valve unit 150 can be used to switch to the third pulper 131, and the required pulp is pulped by the first pulper 111 or the third pulper 131 and then sent to the second unloading tower 123, so as to ensure that the pulp preparation system where the second pulper 121 is located can supply pulp normally when the second pulper 121 fails, and there will be no pulp tension or pulp breakage.

[0095] Among them, the third pulper 131, the second pulper 121 and the first pulper 111 are pulpers of different pulp preparation systems, such as when the first pulper 111 is a pulper in a chemical-mechanical pulp preparation system, the second pulper 121 is a pulper in a short fiber preparation system, and the third pulper 131 is a pulper in a long fiber preparation system; or when the first pulper 111 is a pulper in a chemical-mechanical pulp preparation system, the second pulper 121 is a pulper in a long fiber preparation system, the third pulper 131 is a pulper in a short fiber preparation system, and so on.

[0096] Specifically, the first pulper 111 is a pulper of a chemical-mechanical pulp preparation system, the second pulper 121 is a pulper of a short fiber preparation system, and the third pulper 131 is a pulper of a long fiber preparation system. When the second pulper 121 works normally, the first valve unit 140 is in a closed state, the short fiber pulp is pulped by the first pulper 111, and then the pulp is sent to the first unloading tower 113 through the first unloading pump 112. When the second pulper 121 fails, the first pulper 121 fails. When the pulper 111 is in an idle state, the first valve unit 140 is controlled to open, and the first pulp inlet valve in front of the first unloading tower 113 is closed at the same time, and the second pulper 121 is switched to the first pulper 111. After the short fiber pulp is pulped by the first pulper 111, it is sent to the second unloading tower 123 through the first unloading pump 112 and the first valve unit 140, ensuring that there is no pulp tension or pulp break in the short fiber preparation system, thereby ensuring the operation efficiency of the short fiber preparation system and the paper quality. Similarly, when the first pulper 111 fails and the second pulper 121 is idle, the second pulp inlet valve in front of the second unloading tower 123 can be closed and the first valve unit 140 can be opened, and the first pulper 111 is switched to the second pulper 121. After the chemical-mechanical pulp is pulped by the second pulper 121, it is sent to the first unloading tower 113, ensuring that there is no pulp tension or pulp break in the chemical-mechanical pulp preparation system.

[0097] In some embodiments, it also includes:

[0098] A third valve unit, one end of the third valve unit is connected to the slurry outlet of the first unloading pump 112 , and the other end of the third valve unit is connected to the slurry inlet of the third unloading tower 133 .

[0099] The first valve unit 140, the second valve unit 150 and the third valve unit can realize the switching between the first pulper 111, the second pulper 121 and the third pulper 131. When one of the pulpers fails, the idle pulper of the other two pulpers can be selected to cut the failed pulper, so as to ensure that the pulp preparation system of the failed pulper can supply pulp normally. For example, when the first pulper 111 fails, the pulper in the idle state of the second pulper 121 or the third pulper 131 is switched. If the second pulper 121 is in the idle state, the first pulper 111 is switched to the second pulper 121, and the pulping work to be completed by the first pulper 111 is completed by the second pulper 121.

[0100] In some embodiments, the first valve unit 140, the second valve unit 150 and the third valve unit are each composed of two valves. Wherein, by the first valve unit 140, the second valve unit 150 and the third valve unit are each composed of two valves, the problem of slurry accumulation in the pipeline where the first valve unit 140, the pipeline where the second valve unit 150 and the pipeline where the third valve unit are located can be effectively avoided. Wherein, on the pipeline where the first valve unit 140 is located, the two valves of the first valve unit 140 are spaced apart by a preset distance, such as the two valves divide the pipeline where the first valve unit 140 is located into three equal parts, similarly, the pipeline where the second valve unit 150 is located is divided into three equal parts by the two valves of the second valve unit 150, and the pipeline where the third valve unit is located is divided into three equal parts by the two valves of the third valve unit.

[0101] In some embodiments, it also includes:

[0102] A DCS control system is connected to the control ends of the first valve unit 140 , the second valve unit 150 and the third valve unit.

[0103] The first valve unit 140, the second valve unit 150 and the third valve unit are controlled by the DCS system. When the corresponding valve unit needs to be opened or closed, the corresponding command is sent to the corresponding valve unit through the DCS system. The DCS system is a distributed control system (Distributed Control System). The distributed control system is based on a microprocessor and is a new generation of instrument control system that adopts the design principles of decentralized control functions, centralized display operations, and taking into account the design principles of decentralized autonomy and comprehensive coordination.

[0104] In some embodiments, the slurry outlet of the first unloading pump 112 is provided with a first slurry outlet valve;

[0105] The slurry outlet of the second unloading pump 122 is provided with a second slurry outlet valve;

[0106] The slurry outlet of the third unloading pump 132 is provided with a third slurry outlet valve.

[0107] Among them, in order to avoid the influence of the slurry on the unloading pump during the switching process, a first slurry discharge valve is provided at the slurry discharge port of the first unloading pump 112, a second slurry discharge valve is provided at the slurry discharge port of the second unloading pump 122, and a third slurry discharge valve is provided at the slurry discharge port of the third unloading pump 132. This can avoid the corresponding unloading pump being affected by the slurry sent out by the switched pulper flowing back to the unloading pump when a pulping machine fails. For example, when the first pulper 111 fails, when switching to the second pulper 121 or the third pulper 131, the first slurry discharge valve on the slurry discharge port of the first unloading pump 112 is closed, and when the pulped slurry of the second pulper 121 or the third pulper 131 is sent to the first unloading tower 113, the slurry is prevented from flowing back to the first unloading pump 112 and affecting the first unloading pump 112.

[0108] like Figure 6 A white cardboard pulping system shown is composed of a chemical mechanical pulping machine of a chemical mechanical pulping system, a long fiber pulping machine of a long fiber pulping system and a short fiber pulping machine of a short fiber pulping system, the first valve unit 140 is composed of valves Kv1 and Kv2, and the second valve unit is composed of valves Kv3 and Kv4, wherein the chemical mechanical pulping machine and the short fiber pulping machine are switched through valves Kv1 and Kv2, and the long fiber pulping machine and the short fiber pulping machine are switched through valves Kv3 and Kv4, and the chemical mechanical pulping machine and the long fiber pulping machine can be switched through valves Kv1, Kv2, Kv3 and Kv4. According to production needs, the DCS control system issues instructions to switch the four valves Kv1, Kv2, Kv3 and Kv4 to complete which pulp the pulper needs to crush.

[0109] See also Figure 7 A white cardboard stock preparation system includes a first stock preparation system 110, a second stock preparation system 120, a third stock preparation system 130, a first valve unit 140 and a second valve unit 150; wherein the first pulping, the first unloading pump 112 and the first unloading tower 113 of the first stock preparation system 110, the second pulping, the second unloading pump 122 and the second unloading tower 123 of the second stock preparation system 120, the third pulping, the third unloading pump 132 and the third unloading tower 133 of the third stock preparation system 130, the first valve unit 140 and the second valve unit 150 form a structure as shown in FIG. Figure 4 The white cardboard pulping system shown;

[0110] The first stock preparation system 110 is a long fiber stock preparation system or a short fiber stock preparation system or a chemical mechanical pulp preparation system. The first stock preparation system 110 includes:

[0111] A first pulper 111;

[0112] A first unloading pump 112, wherein a pulp inlet of the first unloading pump 112 is connected to a pulp outlet of the first pulper 111;

[0113] A first unloading tower 113, wherein a slurry inlet of the first unloading tower 113 is connected to a slurry outlet of the first unloading pump 112, and a first slurry inlet valve is provided in front of the slurry inlet of the first unloading tower 113;

[0114] The second stock preparation system 120 is a long fiber stock preparation system or a short fiber stock preparation system or a chemical mechanical pulp preparation system, and the second stock preparation system 120 includes:

[0115] Second pulper 121;

[0116] A second unloading pump 122, wherein the pulp inlet of the second unloading pump 122 is connected to the pulp outlet of the second pulper 121;

[0117] A second unloading tower 123, wherein the second unloading tower 123 is connected to the slurry outlet of the second unloading pump 122, and a second slurry inlet valve is provided in front of the slurry inlet of the second unloading tower 123;

[0118] A first valve unit 140, wherein one end of the first valve unit 140 is connected to the first unloading pump 112, and the other end of the first valve unit 140 is connected to the slurry inlet of the second unloading tower 123;

[0119] The third stock preparation system 130 is a long fiber stock preparation system or a short fiber stock preparation system or a chemical mechanical pulp preparation system. The third stock preparation system 130, the second stock preparation system 120 and the first stock preparation system 110 are different stock preparation systems. The third stock preparation system 130 includes:

[0120] The third pulper 131;

[0121] A third unloading pump 132, wherein the pulp inlet of the third unloading pump 132 is connected to the pulp outlet of the third pulper 131;

[0122] A third unloading tower 133, wherein the slurry inlet of the third unloading tower 133 is connected to the slurry outlet of the third unloading pump 132, and a third slurry inlet valve is provided in front of the slurry inlet of the third unloading tower 133;

[0123] The second valve unit 150 , one end of the second valve unit 150 is connected to the slurry outlet of the third unloading pump 132 , and the other end of the second valve unit 150 is connected to the slurry inlet of the second unloading tower 123 .

[0124] The white cardboard pulping system is formed by pulping machines of the long fiber pulping system, the short fiber pulping system and the chemical mechanical pulping system. When one of the pulpers fails, it can be switched to other pulpers to replace the failed pulping. For example, when the first pulper 111 fails, the first pulper 111 can be switched to the second pulper 121 through the first valve unit 140. After the second pulper 121 pulps the required pulp, it is sent to the first unloading tower 113 through the second unloading pump 122 and the first valve unit 140, ensuring that the first pulper 111 is fully pulped. The pulp preparation system where the pulper 111 is located may supply pulp normally. Similarly, when the second pulper 121 fails, it can be switched to the first pulper 111 through the first valve unit 140 or switched to the third pulper 131 through the second valve unit 150. The required pulp is pulped by the first pulper 111 or the third pulper 131 and then sent to the second unloading tower 123, ensuring that the pulp preparation system where the second pulper 121 is located can supply pulp normally when the second pulper 121 fails, and there will be no pulp tension or pulp breakage.

[0125] Among them, the third pulper 131, the second pulper 121 and the first pulper 111 are pulpers of different pulp preparation systems, such as when the first pulper 111 is a pulper in a chemical-mechanical pulp preparation system, the second pulper 121 is a pulper in a short fiber preparation system, and the third pulper 131 is a pulper in a long fiber preparation system; or when the first pulper 111 is a pulper in a chemical-mechanical pulp preparation system, the second pulper 121 is a pulper in a long fiber preparation system, the third pulper 131 is a pulper in a short fiber preparation system, and so on.

[0126] Specifically, the first pulper 111 is a pulper of a chemical-mechanical pulp preparation system, the second pulper 121 is a pulper of a short fiber preparation system, and the third pulper 131 is a pulper of a long fiber preparation system. When the second pulper 121 works normally, the first valve unit 140 is in a closed state, the short fiber pulp is pulped by the first pulper 111, and then the pulp is sent to the first unloading tower 113 through the first unloading pump 112. When the second pulper 121 fails, the first pulper 121 fails. When the pulper 111 is in an idle state, the first valve unit 140 is controlled to open, and the first pulp inlet valve in front of the first unloading tower 113 is closed at the same time, and the second pulper 121 is switched to the first pulper 111. After the short fiber pulp is pulped by the first pulper 111, it is sent to the second unloading tower 123 through the first unloading pump 112 and the first valve unit 140, ensuring that there is no pulp tension or pulp break in the short fiber preparation system, thereby ensuring the operation efficiency of the short fiber preparation system and the paper quality. Similarly, when the first pulper 111 fails and the second pulper 121 is idle, the second pulp inlet valve in front of the second unloading tower 123 can be closed and the first valve unit 140 can be opened, and the first pulper 111 is switched to the second pulper 121. After the chemical-mechanical pulp is pulped by the second pulper 121, it is sent to the first unloading tower 113, ensuring that there is no pulp tension or pulp break in the chemical-mechanical pulp preparation system.

[0127] In some embodiments, it also includes:

[0128] A third valve unit, one end of the third valve unit is connected to the slurry outlet of the first unloading pump 112 , and the other end of the third valve unit is connected to the slurry inlet of the third unloading tower 133 .

[0129] The first valve unit 140, the second valve unit 150 and the third valve unit can realize the switching between the first pulper 111, the second pulper 121 and the third pulper 131. When one of the pulpers fails, the idle pulper of the other two pulpers can be selected to cut the failed pulper, so as to ensure that the pulp preparation system of the failed pulper can supply pulp normally. For example, when the first pulper 111 fails, the pulper in the idle state of the second pulper 121 or the third pulper 131 is switched. If the second pulper 121 is in the idle state, the first pulper 111 is switched to the second pulper 121, and the pulping work to be completed by the first pulper 111 is completed by the second pulper 121.

[0130] In some embodiments, the first valve unit 140, the second valve unit 150 and the third valve unit are each composed of two valves. Wherein, by the first valve unit 140, the second valve unit 150 and the third valve unit are each composed of two valves, the problem of slurry accumulation in the pipeline where the first valve unit 140, the pipeline where the second valve unit 150 and the pipeline where the third valve unit are located can be effectively avoided. Wherein, on the pipeline where the first valve unit 140 is located, the two valves of the first valve unit 140 are spaced apart by a preset distance, such as the two valves divide the pipeline where the first valve unit 140 is located into three equal parts, similarly, the pipeline where the second valve unit 150 is located is divided into three equal parts by the two valves of the second valve unit 150, and the pipeline where the third valve unit is located is divided into three equal parts by the two valves of the third valve unit.

[0131] In some embodiments, it also includes:

[0132] A DCS control system is connected to the control ends of the first valve unit 140 , the second valve unit 150 and the third valve unit.

[0133] The first valve unit 140, the second valve unit 150 and the third valve unit are controlled by the DCS system. When the corresponding valve unit needs to be opened or closed, the corresponding command is sent to the corresponding valve unit through the DCS system. The DCS system is a distributed control system (Distributed Control System). The distributed control system is based on a microprocessor and is a new generation of instrument control system that adopts the design principles of decentralized control functions, centralized display operations, and taking into account the design principles of decentralized autonomy and comprehensive coordination.

[0134] In some embodiments, the slurry outlet of the first unloading pump 112 is provided with a first slurry outlet valve;

[0135] The slurry outlet of the second unloading pump 122 is provided with a second slurry outlet valve;

[0136] The slurry outlet of the third unloading pump 132 is provided with a third slurry outlet valve.

[0137] Among them, in order to avoid the influence of the slurry on the unloading pump during the switching process, a first slurry discharge valve is provided at the slurry discharge port of the first unloading pump 112, a second slurry discharge valve is provided at the slurry discharge port of the second unloading pump 122, and a third slurry discharge valve is provided at the slurry discharge port of the third unloading pump 132. This can avoid the corresponding unloading pump being affected by the slurry sent out by the switched pulper flowing back to the unloading pump when a pulping machine fails. For example, when the first pulper 111 fails, when switching to the second pulper 121 or the third pulper 131, the first slurry discharge valve on the slurry discharge port of the first unloading pump 112 is closed, and when the pulped slurry of the second pulper 121 or the third pulper 131 is sent to the first unloading tower 113, the slurry is prevented from flowing back to the first unloading pump 112 and affecting the first unloading pump 112.

[0138] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concept of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. A white cardboard pulping system, characterized in that: include: A first pulper, wherein the first pulper is a pulper in a long fiber pulping system, a short fiber pulping system, or a chemical mechanical pulping system; a first unloading pump, wherein a pulp inlet of the first unloading pump is connected to a pulp outlet of the first pulper; A first unloading tower, wherein a slurry inlet of the first unloading tower is connected to a slurry outlet of the first unloading pump, and a first slurry inlet valve is provided in front of the slurry inlet of the first unloading tower; A second pulper, wherein the second pulper is a pulper in a long fiber pulping system, a short fiber pulping system, or a chemical mechanical pulping system; a second unloading pump, wherein the pulp inlet of the second unloading pump is connected to the pulp outlet of the second pulper; A second unloading tower, wherein the second unloading tower is connected to the slurry outlet of the second unloading pump, and a second slurry inlet valve is provided in front of the slurry inlet of the second unloading tower; a first valve unit, wherein one end of the first valve unit is connected to the first unloading pump, and the other end of the first valve unit is connected to the slurry inlet of the second unloading tower; A third pulper, wherein the third pulper is a pulper in a long fiber pulping system, a short fiber pulping system, or a chemical mechanical pulping system, and the third pulper, the second pulper, and the first pulper are pulpers of different pulping systems; a third unloading pump, wherein the pulp inlet of the third unloading pump is connected to the pulp outlet of the third pulper; A third unloading tower, wherein the slurry inlet of the third unloading tower is connected to the slurry outlet of the third unloading pump, and a third slurry inlet valve is provided in front of the slurry inlet of the third unloading tower; A second valve unit, one end of the second valve unit is connected to the slurry outlet of the third unloading pump, and the other end of the second valve unit is connected to the slurry inlet of the second unloading tower.

2. The white cardboard pulping system according to claim 1, characterized in that: Also includes: A third valve unit, one end of the third valve unit is connected to the slurry outlet of the first unloading pump, and the other end of the third valve unit is connected to the slurry inlet of the third unloading tower.

3. The white cardboard pulping system according to claim 2, characterized in that: The first valve unit, the second valve unit and the third valve unit are each composed of two valves.

4. The white cardboard pulping system according to claim 2, characterized in that: Also includes: A DCS control system is connected to the control ends of the first valve unit, the second valve unit and the third valve unit.

5. The white cardboard pulping system according to claim 1, characterized in that: The slurry outlet of the first unloading pump is provided with a first slurry outlet valve; The slurry outlet of the second unloading pump is provided with a second slurry outlet valve; The slurry outlet of the third unloading pump is provided with a third slurry outlet valve.

6. A white cardboard stock preparation system, characterized in that: It includes a first slurry preparation system, a second slurry preparation system, a third slurry preparation system, a first valve unit and a second valve unit; The first stock preparation system is a long fiber stock preparation system or a short fiber stock preparation system or a chemical mechanical pulp preparation system, and the first stock preparation system includes: First pulper; a first unloading pump, wherein a pulp inlet of the first unloading pump is connected to a pulp outlet of the first pulper; A first unloading tower, wherein a slurry inlet of the first unloading tower is connected to a slurry outlet of the first unloading pump, and a first slurry inlet valve is provided in front of the slurry inlet of the first unloading tower; The second stock preparation system is a long fiber stock preparation system or a short fiber stock preparation system or a chemical mechanical pulp preparation system, and the second stock preparation system includes: Second pulper; a second unloading pump, wherein the pulp inlet of the second unloading pump is connected to the pulp outlet of the second pulper; A second unloading tower, wherein the second unloading tower is connected to the slurry outlet of the second unloading pump, and a second slurry inlet valve is provided in front of the slurry inlet of the second unloading tower; a first valve unit, wherein one end of the first valve unit is connected to the first unloading pump, and the other end of the first valve unit is connected to the slurry inlet of the second unloading tower; The third stock preparation system is a long fiber stock preparation system or a short fiber stock preparation system or a chemical mechanical pulp preparation system. The third stock preparation system, the second stock preparation system and the first stock preparation system are different stock preparation systems. The third stock preparation system includes: The third pulper; a third unloading pump, wherein the pulp inlet of the third unloading pump is connected to the pulp outlet of the third pulper; A third unloading tower, wherein the slurry inlet of the third unloading tower is connected to the slurry outlet of the third unloading pump, and a third slurry inlet valve is provided in front of the slurry inlet of the third unloading tower; A second valve unit, one end of the second valve unit is connected to the slurry outlet of the third unloading pump, and the other end of the second valve unit is connected to the slurry inlet of the second unloading tower.

7. The white cardboard stock preparation system according to claim 6, characterized in that: Also includes: A third valve unit, one end of the third valve unit is connected to the slurry outlet of the first unloading pump, and the other end of the third valve unit is connected to the slurry inlet of the third unloading tower.

8. The white cardboard stock preparation system according to claim 7, characterized in that: The first valve unit, the second valve unit and the third valve unit are each composed of two valves.

9. The white cardboard stock preparation system according to claim 7, characterized in that: Also includes: A DCS control system is connected to the control ends of the first valve unit, the second valve unit and the third valve unit.

10. The white cardboard stock preparation system according to claim 6, characterized in that: The slurry outlet of the first unloading pump is provided with a first slurry outlet valve; The slurry outlet of the second unloading pump is provided with a second slurry outlet valve; The slurry outlet of the third unloading pump is provided with a third slurry outlet valve.

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