A method for controlling the processing of high consistency pulp
By optimizing the processing flow in high-consistency and low-consistency grinding pulping systems, determining the shortest processing time and electricity price range, the problems of low production efficiency and high electricity cost in high-consistency grinding pulping were solved, achieving efficient and low-cost pulping production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HUBEI LIBANG PAPER CO LTD
- Filing Date
- 2024-03-19
- Publication Date
- 2026-07-24
AI Technical Summary
Existing technologies suffer from low production efficiency and high electricity costs in high-consistency pulping, resulting in high process operating costs and poor overall efficiency.
By obtaining the processing efficiency of each node in the high-consistency mill and low-consistency mill pulping system, determining the shortest processing time and electricity price range, and optimizing the pulping system to improve efficiency, including short fiber, mixed fiber, and mixed short fiber pulping, using pulpers with different power consumption, the high-consistency mill and low-consistency mill processing flow is optimized.
It improved the production efficiency of high-consistency pulping, reduced electricity costs, optimized process operation costs, and enhanced overall efficiency.
Smart Images
Figure CN118223320B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of papermaking and pulp processing technology. Specifically, it relates to a processing control method and system for high-consistency pulping. Background Technology
[0002] In pulp processing, due to differences in fiber length and production efficiency, it is generally divided into high-consistency milling and low-consistency milling. Short fibers are usually processed using high-consistency milling, while blended fibers can be processed using either high-consistency milling or low-consistency milling. In existing methods, high-consistency milling or low-consistency milling is usually arranged according to equipment limitations. However, due to the high electricity cost in the production process, the overall efficiency is poor, resulting in long operating costs and low production efficiency. Summary of the Invention
[0003] The purpose of this invention is to provide a processing control method and system for high-consistency pulping, which solves the problem of low overall efficiency in the preparation of blended fiber pulp.
[0004] In one aspect, the present invention provides a processing control method for high-consistency pulping, which can be implemented in a pulping process system including high-consistency milling and low-consistency milling. The processing control method for high-consistency pulping includes: Step S101: From the high-consistency mill and low-consistency mill pulping process systems, respectively obtain the high-consistency pulp processing node and the high-consistency mill processing flow including the high-consistency pulp processing node in the high-consistency mill pulping process system, and the low-consistency pulp processing node and the low-consistency mill processing flow including the low-consistency pulp processing node in the low-consistency mill pulping process system.
[0005] Step S102: Based on the processing efficiency of the subsequent nodes of each high-concentration slurry processing node, obtain the processing efficiency of the current high-concentration slurry processing node. Based on the processing efficiency of the subsequent nodes of each low-concentration slurry processing node, obtain the processing efficiency of the current low-concentration slurry processing node.
[0006] Step S103: When the current material to be processed is mixed fiber, the shortest processing time is obtained based on the processing efficiency of the root node in the high-concentration pulp processing node and the processing efficiency of the root node in the low-concentration pulp processing node.
[0007] Step S104: Based on the shortest processing time and electricity price range, determine the current pulping process system from the high-consistency mill and low-consistency mill pulping process systems, and process the mixed fibers to be processed.
[0008] In one embodiment of the high-consistency pulping processing control method of the present invention, the pulping process system for both high-consistency and low-consistency milling further includes: Short fiber pulping, short fiber / blended fiber pulping, and mixed short fiber pulping. High-consistency milling systems include short fiber pulping. Low-consistency milling systems include mixed short fiber pulping.
[0009] Step S104 further includes: determining the blended fiber after short fiber / blended fiber pulping as the current fiber to be processed into blended fiber. In another embodiment of the high-consistency pulping processing control method of the present invention, short fiber pulping is performed through a first pulping... The first pulper has a power consumption of 40m³ / 355kW to 45m³ / 355kW. Short fiber / blended fiber pulping is performed by a second pulper, with a power consumption of 40m³ / 355kW to 45m³ / 355kW. Blended short fiber pulping is performed by a third pulper, with a power consumption of 10m³ / 55kW to 15m³ / 55kW.
[0010] In another embodiment of the high-consistency pulping processing control method of the present invention, according to the high-consistency milling process, the high-consistency pulping nodes sequentially include: a short fiber mill pre-milling pool settling processing node, a high-consistency milling processing node, a high-consistency milling post-milling transition pool settling processing node, and a high-consistency short fiber milling post-milling pulping tower settling processing node.
[0011] According to the low-concentration milling process, the low-concentration slurry processing nodes include, in sequence: the static processing node of the pre-mixed fiber mill pool, the low-concentration milling process, and the static processing node of the post-mixed fiber mill slurry tower.
[0012] In another embodiment of the high-consistency pulping control method of the present invention, the high-consistency grinding processing node includes a first high-consistency grinding processing node and a second high-consistency grinding processing node. The high-consistency grinding post-transition tank settling processing node includes a first high-consistency grinding post-transition tank settling processing node and a second high-consistency grinding post-transition tank settling processing node. The high-consistency short fiber grinding post-pulp tower settling processing node includes a first high-consistency short fiber grinding post-pulp tower settling processing node and a second high-consistency short fiber grinding post-pulp tower settling processing node.
[0013] In another embodiment of the high-consistency pulping processing control method of the present invention, the pre-refinement tank settling processing node for fiber blending includes a first pre-refinement tank settling processing node and a second pre-refinement tank settling processing node for fiber blending. The low-consistency refinement processing node includes a first low-consistency refinement processing node and a second low-consistency refinement processing node for fiber blending. The post-refinement pulping tower settling processing node for fiber blending includes a low-consistency paper wastage and short fiber post-refinement pulping tower settling processing node for low-consistency fiber blending post-refinement pulping tower settling processing node for fiber blending.
[0014] In another embodiment of the high-consistency pulp processing control method of the present invention, the step S102 of obtaining the processing efficiency of the current high-consistency pulp processing node based on the processing efficiency of the subsequent nodes of each current high-consistency pulp processing node includes: obtaining the processing efficiency of the high-consistency pulp processing node corresponding to the currently idle nodes of the first and second high-consistency pulp processing nodes; or obtaining the processing efficiency of the high-consistency pulp processing node based on the average of the total efficiency of the first and second high-consistency pulp processing nodes.
[0015] The processing efficiency of the high-consistency grinding transition pool stationary processing node is determined based on the average efficiency of the first high-consistency grinding transition pool stationary processing node and the second high-consistency grinding transition pool stationary processing node, and the currently idle nodes of the first high-consistency grinding transition pool stationary processing node and the second high-consistency grinding transition pool stationary processing node.
[0016] In another embodiment of the high-consistency pulp processing control method of the present invention, step S102 further includes: sequentially numbering the high-consistency pulp processing nodes according to the high-consistency milling process flow; and sequentially numbering the low-consistency pulp processing nodes according to the low-consistency milling process flow. Number them sequentially.
[0017] The steps to obtain the processing efficiency of a current high-concentration slurry processing node based on the processing efficiencies of its subsequent nodes include: obtaining the numbers of the subsequent nodes sequentially based on the current high-concentration slurry processing node number; obtaining the processing efficiency of each subsequent node based on its node number; and finally, obtaining the processing efficiency of the current high-concentration slurry processing node by summing the processing efficiencies of all subsequent nodes.
[0018] The steps to obtain the processing efficiency of a current low-concentration slurry processing node based on the processing efficiencies of its subsequent nodes include: obtaining the numbers of the subsequent nodes sequentially based on the current low-concentration slurry processing node number; obtaining the processing efficiency of each subsequent node based on its node number; and finally, obtaining the processing efficiency of the current low-concentration slurry processing node by summing the processing efficiencies of all subsequent nodes.
[0019] In another embodiment of the processing control method for high-consistency pulp of the present invention, step S104 further includes: Step S105: After fiber mixing and pulping, multiple mixing process nodes are entered in parallel. The current mixing process node is determined based on the idle devices of the multiple mixing process nodes. The fiber mixing process is then performed through the current mixing process node after pulping.
[0020] In another embodiment of the high-consistency pulp processing control method of the present invention, the pulp mixing process nodes include a pulp mixing process node, a mixing tank settling process node, a homogenizing mill process node, and a pre-sanding tank process node arranged sequentially.
[0021] The following section will further explain the characteristics, technical features, advantages, and implementation methods of the high-consistency pulping processing control method and system in a clear and easy-to-understand manner, with the aid of accompanying figures. Attached Figure Description
[0022] Figure 1 is a schematic flowchart illustrating a high-consistency pulping process control method in one embodiment of the present invention. Detailed Implementation
[0023] To provide a clearer understanding of the technical features, objectives, and effects of the invention, specific embodiments of the invention are now described with reference to the accompanying drawings. In the drawings, the same reference numerals indicate components with the same or similar structures but the same function.
[0024] In this document, "illustrative" means "serving as an example, illustration, or description," and any illustrations or embodiments described herein as "illustrative" should not be construed as a more preferred or advantageous technical solution. For the sake of brevity, each figure only schematically shows the parts relevant to this exemplary embodiment, and they do not represent the actual structure or true proportions of the product.
[0025] As shown in Figure 1, one aspect of the present invention provides a processing control method for high-consistency pulping. This method can be implemented in a pulping process system including high-consistency milling and low-consistency milling. The processing control method for high-consistency pulping includes: Step S101: From the high-consistency mill and low-consistency mill pulping process systems, obtain the high-consistency pulp processing node and the high-consistency mill processing flow including the high-consistency pulp processing node in the high-consistency mill pulping process system, and the low-consistency mill pulping process... Thick slurry processing nodes and low-concentration grinding processes including low-concentration slurry processing nodes.
[0026] Step S102: Based on the processing efficiency of the subsequent nodes of each high-concentration slurry processing node, obtain the processing efficiency of the current high-concentration slurry processing node. Based on the processing efficiency of the subsequent nodes of each low-concentration slurry processing node, obtain the processing efficiency of the current low-concentration slurry processing node.
[0027] For example, when the current high-consistency pulp processing node is the pre-short fiber milling tank node, its processing efficiency is the sum of the efficiencies of the subsequent high-consistency milling processing node, the high-consistency milling post-transition tank settling processing node, and the high-consistency short fiber milling post-pulp tower settling processing node. To facilitate the calculation of the actual processing time period, the processing efficiency can also be converted from the processing time.
[0028] Step S103: When the current material to be processed is mixed fiber, the shortest processing time is obtained based on the processing efficiency of the root node in the high-concentration pulp processing node and the processing efficiency of the root node in the low-concentration pulp processing node.
[0029] For example, the shortest processing time can be obtained from the processing efficiency of the root node in the high-concentration slurry processing node and the processing efficiency of the root node in the low-concentration slurry processing node, thus obtaining the corresponding shortest processing time.
[0030] Step S104: Based on the shortest processing time and electricity price range, determine the current pulping process system from the high-consistency mill and low-consistency mill pulping process systems, and process the mixed fibers to be processed.
[0031] For example, the electricity price for the shortest working time can be calculated based on whether the current electricity price is peak or off-peak. If the current electricity price is peak, the pulping process corresponding to the shortest processing time is selected. If the current electricity price is off-peak, the pulping process corresponding to the shortest processing time is not selected. This increases the idle rate of the most efficient processing method, thus providing an optimal processing strategy for processing during peak electricity prices, rather than simply choosing the most efficient method.
[0032] In one embodiment of the high-consistency pulping processing control method of the present invention, the pulping process system for both high-consistency and low-consistency milling further includes: Short fiber pulping, short fiber / blended fiber pulping, and mixed short fiber pulping. High-consistency milling systems include short fiber pulping. Low-consistency milling systems include mixed short fiber pulping.
[0033] Step S104 further includes: determining the blended fiber after short fiber / blended fiber pulping as the current fiber to be processed into blended fiber. In another embodiment of the high-consistency pulping processing control method of the present invention, short fiber pulping is performed through a first pulping... The first pulper has a power consumption of 40m³ / 355kW to 45m³ / 355kW. Short fiber / blended fiber pulping is performed by a second pulper, with a power consumption of 40m³ / 355kW to 45m³ / 355kW. Blended short fiber pulping is performed by a third pulper, with a power consumption of 10m³ / 55kW to 15m³ / 55kW.
[0034] In another embodiment of the high-consistency pulping control method of the present invention, according to the high-consistency milling process, the high-consistency pulping nodes sequentially include: a short-fiber mill pre-milling settling node, a high-consistency milling node, a high-consistency milling post-milling transition pool settling node, and a high-consistency short-fiber milling post-milling pulping tower settling node. As shown in Figure 1, the short-fiber mill pre-milling settling node is implemented using a 400 m³ short-fiber mill pre-milling pool.
[0035] According to the low-concentration milling process, the low-concentration slurry processing nodes include, in sequence: the pre-pool settling processing node of the fiber blending mill, the low-concentration mill... Processing nodes and static processing nodes in the pulp tower after fiber mixing milling.
[0036] In another embodiment of the high-consistency pulping control method of the present invention, the high-consistency grinding processing node includes a first high-consistency grinding processing node and a second high-consistency grinding processing node. The high-consistency grinding post-transition tank settling processing node includes a first high-consistency grinding post-transition tank settling processing node and a second high-consistency grinding post-transition tank settling processing node. The high-consistency short fiber grinding post-pulp tower settling processing node includes a first high-consistency short fiber grinding post-pulp tower settling processing node and a second high-consistency short fiber grinding post-pulp tower settling processing node.
[0037] As shown in Figure 1, the first high-consistency mill processing node is achieved through a No. 1 high-consistency mill (short fiber) with model HCR1100P / 900kW-4 pole. The second high-consistency mill processing node is achieved through a No. 2 high-consistency mill (short fiber) with model HCR1100P / 900kW-4 pole.
[0038] The first high-consistency mill post-milling transition tank settling process node is achieved through a 30m³ high-consistency mill post-milling transition tank (No. 1). The second high-consistency mill post-milling transition tank settling process node is achieved through a 30m³ high-consistency mill post-milling transition tank (No. 2). The first high-consistency short fiber mill post-milling pulp tower settling process node is achieved through a 950m³ high-consistency short fiber mill post-milling pulp tower (No. 1). The second high-consistency short fiber mill post-milling pulp tower settling process node is achieved through a 950m³ high-consistency short fiber mill post-milling pulp tower (No. 2).
[0039] In another embodiment of the high-consistency pulping processing control method of the present invention, the pre-refinement tank settling processing node for fiber blending includes a first pre-refinement tank settling processing node and a second pre-refinement tank settling processing node for fiber blending. The low-consistency refinement processing node includes a first low-consistency refinement processing node and a second low-consistency refinement processing node for fiber blending. The post-refinement pulping tower settling processing node for fiber blending includes a low-consistency paper wastage and short fiber post-refinement pulping tower settling processing node for low-consistency fiber blending post-refinement pulping tower settling processing node for fiber blending.
[0040] The first pre-grinding stage for blended fiber is achieved using a 300m³ pre-grinding tank. The second pre-grinding stage for blended fiber is achieved using a 150m³ pre-grinding tank for both waste paper and short fiber. The first low-consistency grinding stage is achieved using a PM26 / 500kW No. 1 low-consistency mill (waste paper + short fiber / blended fiber). The second low-consistency grinding stage is achieved using a PM26 / 500kW No. 1 low-consistency mill (blended fiber).
[0041] In another embodiment of the high-consistency pulp processing control method of the present invention, the step S102 of obtaining the processing efficiency of the current high-consistency pulp processing node based on the processing efficiency of the subsequent nodes of each current high-consistency pulp processing node includes: obtaining the processing efficiency of the high-consistency pulp processing node corresponding to the currently idle nodes of the first and second high-consistency pulp processing nodes; or obtaining the processing efficiency of the high-consistency pulp processing node based on the average of the total efficiency of the first and second high-consistency pulp processing nodes.
[0042] The processing efficiency of the high-consistency grinding transition pool stationary processing node is determined based on the average efficiency of the first high-consistency grinding transition pool stationary processing node and the second high-consistency grinding transition pool stationary processing node, and the currently idle nodes of the first high-consistency grinding transition pool stationary processing node and the second high-consistency grinding transition pool stationary processing node.
[0043] In another embodiment of the high-consistency pulp processing control method of the present invention, step S102 further includes: sequentially numbering the high-consistency pulp processing nodes according to the high-consistency grinding process flow; and sequentially numbering the low-consistency pulp processing nodes according to the low-consistency grinding process flow.
[0044] The steps to obtain the processing efficiency of a current high-concentration slurry processing node based on the processing efficiencies of its subsequent nodes include: obtaining the numbers of the subsequent nodes sequentially based on the current high-concentration slurry processing node number; obtaining the processing efficiency of each subsequent node based on its node number; and finally, obtaining the processing efficiency of the current high-concentration slurry processing node by summing the processing efficiencies of all subsequent nodes.
[0045] The steps to obtain the processing efficiency of a current low-concentration slurry processing node based on the processing efficiencies of its subsequent nodes include: obtaining the numbers of the subsequent nodes sequentially based on the current low-concentration slurry processing node number; obtaining the processing efficiency of each subsequent node based on its node number; and finally, obtaining the processing efficiency of the current low-concentration slurry processing node by summing the processing efficiencies of all subsequent nodes.
[0046] In another embodiment of the processing control method for high-consistency pulp of the present invention, step S104 further includes: Step S105: After fiber mixing and pulping, multiple mixing process nodes are entered in parallel. The current mixing process node is determined based on the idle devices of the multiple mixing process nodes. The fiber mixing process is then performed through the current mixing process node after pulping.
[0047] In another embodiment of the high-consistency pulp processing control method of the present invention, the pulp mixing process nodes include a pulp mixing process node, a mixing tank settling process node, a homogenizing mill process node, and a pre-sanding tank process node arranged sequentially.
[0048] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only [specific embodiments]. This specification is a standalone technical solution. The way it is described in this specification is only for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
[0049] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.
Claims
1. A method for controlling the processing of high-consistency pulp, characterized in that, The method can be implemented in pulping systems including high-consistency milling and low-consistency milling, wherein the processing control method for high-consistency milled pulp includes: Step S101: From the high-consistency mill and low-consistency mill pulping process systems, respectively obtain the high-consistency pulp processing node and the high-consistency mill processing flow including the high-consistency pulp processing node in the high-consistency mill pulping process system, and the low-consistency pulp processing node and the low-consistency mill processing flow including the low-consistency pulp processing node in the low-consistency mill pulping process system. Step S102: Based on the processing efficiency of the subsequent nodes of each high-concentration slurry processing node, obtain the processing efficiency of the current high-concentration slurry processing node; based on the processing efficiency of the subsequent nodes of each low-concentration slurry processing node, obtain the processing efficiency of the current low-concentration slurry processing node. Step S103: When the current material to be processed is mixed fiber, the shortest processing time is obtained based on the processing efficiency of the root node in the high-concentration pulp processing node and the processing efficiency of the root node in the low-concentration pulp processing node. Step S104: Based on the shortest processing time and electricity price range, determine the current pulping process system from the high-consistency mill and low-consistency mill pulping process systems, and process the mixed fiber to be processed; if the current electricity price is peak, select the pulping process corresponding to the shortest processing time; if the current electricity price is off-peak, do not select the pulping process corresponding to the shortest processing time. According to the high-consistency milling process, the high-consistency slurry processing nodes sequentially include: a pre-short fiber milling pool settling processing node, a high-consistency milling processing node, a post-high-consistency milling transition pool settling processing node, and a post-high-consistency short fiber milling slurry tower settling processing node. According to the low-concentration milling process, the low-concentration slurry processing nodes sequentially include: the pre-mixing mill pool settling processing node, the low-concentration milling processing node, and the post-mixing mill slurry tower settling processing node. The high-consistency milling process node includes a first high-consistency milling process node and a second high-consistency milling process node; the high-consistency milling post-transition tank settling process node includes a first high-consistency milling post-transition tank settling process node and a second high-consistency milling post-transition tank settling process node; the high-consistency short fiber milling post-pulp tower settling process node includes a first high-consistency short fiber milling post-pulp tower settling process node and a second high-consistency short fiber milling post-pulp tower settling process node. The step S102, which involves obtaining the processing efficiency of the current high-consistency slurry processing node based on the processing efficiency of the subsequent nodes of each high-consistency slurry processing node, includes obtaining the processing efficiency of the high-consistency grinding node corresponding to the currently idle nodes of the first and second high-consistency grinding nodes; or obtaining the processing efficiency of the high-consistency grinding node based on the average total efficiency of the first and second high-consistency grinding nodes. The processing efficiency of the high-concentration mill transition pool stationary processing node is determined based on the average efficiency of the first high-concentration mill transition pool stationary processing node and the second high-concentration mill transition pool stationary processing node, or the currently idle node of the first high-concentration mill transition pool stationary processing node and the second high-concentration mill transition pool stationary processing node.
2. The processing control method for high-consistency pulp according to claim 1, characterized in that, The pulping process system for high-consistency milling and low-consistency milling also includes: Short fiber pulping, short fiber / blended fiber pulping, and mixed short fiber pulping; The high-consistency milling pulping process system includes short fiber pulping; the low-consistency milling pulping process system includes mixed short fiber pulping. Step S104 further includes: determining the mixed fiber after short fiber / mixed fiber pulping as the current mixed fiber to be processed.
3. The processing control method for high-consistency pulping according to claim 2, characterized in that, The short fiber pulping process is achieved through a first pulper, which has a power consumption of 40m³ / h. 3 355kw~45m 3 / 355kw; The short fiber / blended fiber pulping process is achieved through a second pulper, the power consumption of which is 40m. 3 355kw~45m 3 / 355kw; The mixed short fiber pulping process is achieved through a third pulper, the power consumption of which is 10m. 3 55kw~15m 3 / 55kw.
4. The processing control method for high-consistency pulp according to claim 1, characterized in that, The pre-grinding stationary processing node for fiber blending includes a first pre-grinding stationary processing node for fiber blending and a second pre-grinding stationary processing node for fiber blending; the low-consistency grinding processing node includes a first low-consistency grinding processing node for low-consistency grinding and a second low-consistency grinding processing node for low-consistency grinding; the post-grinding pulp tower stationary processing node for fiber blending includes a post-grinding pulp tower stationary processing node for low-consistency paper wastage and short fiber grinding and a post-grinding pulp tower stationary processing node for low-consistency fiber blending.
5. The processing control method for high-consistency pulp according to claim 1, characterized in that, Step S102 further includes: numbering the high-concentration slurry processing nodes sequentially according to the high-concentration milling process; and numbering the low-concentration slurry processing nodes sequentially according to the low-concentration milling process. The step of obtaining the processing efficiency of the current high-concentration slurry processing node based on the processing efficiency of the subsequent nodes of each current high-concentration slurry processing node includes: obtaining the numbers of the subsequent nodes of the current high-concentration slurry processing node in sequence according to the current high-concentration slurry processing node number; obtaining the processing efficiency of each subsequent node according to the subsequent node number; and obtaining the processing efficiency of the current high-concentration slurry processing node according to the sum of the processing efficiencies of each subsequent node. The step of obtaining the processing efficiency of the current low-concentration slurry processing node based on the processing efficiency of the subsequent nodes of each current low-concentration slurry processing node includes: obtaining the numbers of the subsequent nodes of the current low-concentration slurry processing node in sequence according to the current low-concentration slurry processing node number; obtaining the processing efficiency of each subsequent node according to the subsequent node number; and obtaining the processing efficiency of the current low-concentration slurry processing node according to the sum of the processing efficiencies of each subsequent node.
6. The processing control method for high-consistency pulping according to claim 1, characterized in that, The process further includes step S105 after the fiber mixing and pulping, where multiple mixing process nodes are entered in parallel; based on the multiple mixing processes... The idle device of the process node determines the current mixing process node; the fiber mixing process after grinding is carried out through the current mixing process node.
7. The processing control method for high-consistency pulping according to claim 6, characterized in that, The mixing process nodes include, in sequence, the mixing device process node, the mixing tank settling process node, the leveling mill process node, and the pre-mixing tank process node.