A process for cleaning a bulk carrier of viscous material

Abstract

The present application relates to a kind of bulk carrier viscous material's cleaning process, specific steps include: S1, the bulk cargo stored in cargo hold is fed into the conveying belt located in the bottom of cargo hold by hydraulic control switch gate;S2, the material on the cargo hold wall is scraped from top to bottom by grab machine, multiple grab machines are recycled and cooperated with each other, so that the material adhered to the surface of the wall is uniformly transported to the conveying belt of discharge arm;S3, multiple high-pressure gas is circulated and hit to the cargo hold wall;S4, high-pressure water is injected into the cargo hold wall and the bottom of cargo hold, and the residual material on the cargo hold wall and the bottom of cargo hold is flushed;S5, the mixed material in the cargo hold and high-pressure water are pumped to the storage cylinder on deck by high-pressure pump, and solid-liquid separation is carried out in the storage cylinder;S6, multiple cargo hold air dryers are placed in the cargo hold, and the interior of the cargo hold is quickly dried and treated.The present application has the following advantages: the cleaning work of viscous material is quickly and efficiently realized, and the recovery rate of material is improved.

Description

Technical Field

[0001] This invention belongs to the field of bulk carriers, and specifically relates to a tank cleaning process for viscous materials in bulk carriers. Background Technology

[0002] Bulk carriers are short for bulk cargo ships, specifically designed to transport unpackaged goods such as grains, coal, ore, salt, and cement. Because the types of cargo they transport are relatively simple and not susceptible to compression, they do not require bundling, baling, or boxing. Therefore, bulk carriers are generally single-deck, stern-engine type with an octagonal cargo hold cross-section for easy loading and unloading. Furthermore, due to the limited variety of cargo types, less stringent requirements for compartmentalization, and the significant differences in the specific gravity of various bulk cargoes, bulk carriers typically have large cargo hold volumes to accommodate lighter cargo.

[0003] The cleaning of bulk carrier holds typically involves using loaders or pushers dropped into the hold in conjunction with the grab bucket to collect and unload the bulk cargo. However, for cargoes such as mineral powder and coal that are highly sticky and have poor flowability when damp, complete cleaning is usually quite difficult and requires manual cleaning with tools such as brooms and shovels. In particular, cleaning cargo residues adhering to the holds is very difficult due to the large volume and high walls of the holds. The entire cleaning operation takes 8-12 hours and requires 10-20 workers. It is time-consuming, inefficient, and the sticky material residues on the holds are not easy to remove, resulting in a low recovery rate. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a tank cleaning process for viscous materials in bulk carriers, which can quickly and efficiently achieve the tank cleaning of viscous materials and improve the material recovery rate.

[0005] The objective of this invention is achieved through the following technical solution: a tank cleaning process for viscous materials on bulk carriers, comprising the following specific steps:

[0006] S1. The bulk cargo stored in the cargo hold is fed into the conveyor belt located at the bottom of the cargo hold through the hydraulically operated switch gate, and then sent to the bow or stern of the bulk carrier by the conveyor belt. It is then lifted to the deck height of the bulk carrier by the belt conveyor, and then the material is dumped to the shore by the conveyor belt on the unloading arm.

[0007] S2. The grab buckets scrape the material off the cargo hold walls from top to bottom. The scraped material falls to the bottom of the cargo hold due to its own gravity. The grab buckets then collect the material scraped off from the bottom of the cargo hold and transport it from bottom to top to the conveyor belt on the unloading arm. Multiple grab buckets cycle and cooperate with each other multiple times to transport the material adhering to the surface of the cargo hold walls to the conveyor belt on the unloading arm. The material is then delivered to the shore via the conveyor belt on the unloading arm.

[0008] S3. High-pressure gas is circulated through multiple channels and sprayed onto the cargo hold walls. The material adhering to the walls falls to the bottom of the cargo hold. After the material at the bottom of the cargo hold is gathered, it is delivered to the shore by the grab bucket and the conveyor belt of the unloading arm.

[0009] S4. High-pressure water is injected into the cargo hold walls and bottom to flush away the remaining materials on the cargo hold walls and bottom. The materials are mixed with the high-pressure water and then carried to the bottom of the cargo hold.

[0010] S5. The mixed materials and high-pressure water in the cargo hold are pumped into the storage tank on the deck by a high-pressure pump. Solid-liquid separation is carried out in the storage tank. The wastewater after separation is treated and discharged without pollution. The solid materials after separation are dried and transported to shore for storage.

[0011] S6. High-pressure gas is introduced into the cargo hold for air drying, and the interior of the cargo hold is dried quickly.

[0012] A further improvement of the present invention is that, in step S2, the grab bucket is moved from the deck of the bulk carrier to the bottom of the cargo hold along with the crane.

[0013] A further improvement of the present invention is that: in step S5, the flocculant is put into the storage cylinder, and after standing for 2-3 hours, the material sinks to the bottom of the storage cylinder, the wastewater is discharged, and the material at the bottom of the storage cylinder is dried and then discharged.

[0014] A further improvement of the present invention is that: in step S5, the wastewater undergoes multiple filtrations to achieve solid-liquid separation, and finally activated carbon is added to the wastewater after solid-liquid separation for environmental protection treatment.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. This invention first unloads the sticky material in the cargo hold quickly, and then uses a grab bucket to scrape off the sticky material on the hold wall. High-pressure gas and high-pressure water are then used to impact the corners of the hold wall, causing the sticky material adhering to the hold wall to fall off quickly. Under multiple actions, a high recovery rate of sticky material is achieved, and the cleaning of the hold is completed quickly and efficiently.

[0017] 2. The viscous material, after being impacted by high-pressure gas and water, falls to the bottom of the cargo hold. The mixture of viscous material and water is then pumped out to the storage tank on the deck by a high-pressure pump. Impurities and materials in the high-pressure water are settled to the bottom of the hold by a flocculant, thus achieving solid-liquid separation. The wastewater is treated by activated carbon and discharged without pollution. The removal of materials, impurities and high-pressure water from the bottom of the cargo hold can be achieved without manual operation. Detailed Implementation

[0018] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0019] In the description of this invention, it should be understood that the terms indicating orientation or positional relationship are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the structure or unit referred to must have a specific orientation, and therefore should not be construed as a limitation of this invention.

[0020] A tank cleaning process for viscous materials on bulk carriers, comprising the following steps:

[0021] S1. The bulk cargo stored in the cargo hold is fed into the conveyor belt located at the bottom of the cargo hold through the hydraulically operated switch gate, and then sent to the bow or stern of the bulk carrier by the conveyor belt. It is then lifted to the deck height of the bulk carrier by the belt conveyor, and then the material is dumped to the shore by the conveyor belt on the unloading arm.

[0022] S2. The grab buckets scrape the material off the cargo hold walls from top to bottom. The scraped material falls to the bottom of the cargo hold due to its own gravity. The grab buckets then collect the material scraped off from the bottom of the cargo hold and transport it from bottom to top to the conveyor belt on the unloading arm. Multiple grab buckets cycle and cooperate with each other multiple times to transport the material adhering to the surface of the cargo hold walls to the conveyor belt on the unloading arm. The material is then delivered to the shore via the conveyor belt on the unloading arm.

[0023] S3. High-pressure gas is circulated through multiple channels and sprayed onto the cargo hold walls. The material adhering to the walls falls to the bottom of the cargo hold. After the material at the bottom of the cargo hold is gathered, it is delivered to the shore by the grab bucket and the conveyor belt of the unloading arm.

[0024] S4. High-pressure water is injected into the cargo hold walls and bottom to flush away the remaining materials on the cargo hold walls and bottom. The materials are mixed with the high-pressure water and then carried to the bottom of the cargo hold.

[0025] S5. The mixed materials and high-pressure water in the cargo hold are pumped into the storage tank on the deck by a high-pressure pump. Solid-liquid separation is carried out in the storage tank. The wastewater after separation is treated and discharged without pollution. The solid materials after separation are dried and transported to shore for storage.

[0026] S6. High-pressure gas is introduced into the cargo hold for air drying, and the interior of the cargo hold is dried quickly.

[0027] This invention first rapidly unloads the sticky material in the cargo hold, then uses a grab bucket to initially scrape off the sticky material on the hold wall, and then uses high-pressure gas and high-pressure water to impact all corners of the hold wall, causing the sticky material adhering to the hold wall to fall off quickly. Under multiple actions, a high recovery rate of sticky material is achieved, and the cleaning of the hold with sticky material is completed quickly and efficiently.

[0028] Furthermore, in step S2, the grab bucket is moved from the deck of the bulk carrier to the bottom of the cargo hold along with the crane.

[0029] Furthermore, in step S5, the flocculant is added into the storage cylinder, and after standing for 2-3 hours, the material sinks to the bottom of the storage cylinder, the wastewater is discharged, and the material at the bottom of the storage cylinder is dried before being discharged.

[0030] Furthermore, in step S5, the wastewater undergoes multiple filtrations to achieve solid-liquid separation, and finally activated carbon is added to the solid-liquid separated wastewater for environmental protection treatment.

[0031] The viscous material, after being impacted by high-pressure gas and water, falls to the bottom of the cargo hold. A high-pressure pump then extracts the mixture of viscous material and water into a storage tank on the deck. A flocculant helps impurities and materials in the high-pressure water settle to the bottom of the hold, achieving solid-liquid separation. The wastewater is treated with activated carbon and discharged without pollution. The extraction of materials, impurities, and high-pressure water from the bottom of the cargo hold can be completed without manual operation.

[0032] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A tank cleaning process for viscous materials on bulk carriers, characterized in that, The specific steps include: S1. The bulk cargo stored in the cargo hold is fed into the conveyor belt located at the bottom of the cargo hold through the hydraulically operated switch gate, and then sent to the bow or stern of the bulk carrier by the conveyor belt. It is then lifted to the deck height of the bulk carrier by the belt conveyor, and then the material is dumped to the shore by the conveyor belt on the unloading arm. S2. The grab buckets scrape the material off the cargo hold walls from top to bottom. The scraped material falls to the bottom of the cargo hold due to its own gravity. The grab buckets then collect the material scraped off from the bottom of the cargo hold and transport it from bottom to top to the conveyor belt on the unloading arm. Multiple grab buckets cycle and cooperate with each other multiple times to transport the material adhering to the surface of the cargo hold walls to the conveyor belt on the unloading arm. The material is then delivered to the shore via the conveyor belt on the unloading arm. S3. High-pressure gas is circulated through multiple channels and sprayed onto the cargo hold walls. The material adhering to the walls falls to the bottom of the cargo hold. After the material at the bottom of the cargo hold is gathered, it is delivered to the shore by the grab bucket and the conveyor belt of the unloading arm. S4. High-pressure water is injected into the cargo hold walls and bottom to flush away the remaining materials on the cargo hold walls and bottom. The materials are mixed with the high-pressure water and then carried to the bottom of the cargo hold. S5. The mixed materials and high-pressure water in the cargo hold are pumped into the storage tank on the deck by a high-pressure pump. Solid-liquid separation is carried out in the storage tank. The wastewater after separation is treated and discharged without pollution. The solid materials after separation are dried and transported to shore for storage. S6. High-pressure gas is introduced into the cargo hold for air drying, and the interior of the cargo hold is dried quickly.

2. The tank cleaning process for viscous materials on a bulk carrier according to claim 1, characterized in that, In step S2, the grab bucket is moved from the deck of the bulk carrier to the bottom of the cargo hold along with the crane.

3. The tank cleaning process for viscous materials on a bulk carrier according to claim 2, characterized in that, In step S5, the flocculant is added into the storage cylinder and left to stand for 2-3 hours. The material sinks to the bottom of the storage cylinder, the wastewater is discharged, and the material at the bottom of the storage cylinder is dried before being discharged.

4. The tank cleaning process for viscous materials on a bulk carrier according to claim 3, characterized in that, In step S5, the wastewater undergoes multiple filtrations to achieve solid-liquid separation, and finally activated carbon is added to the solid-liquid separated wastewater for environmental protection treatment.