A device and method for adjusting the concentration of ice slurry transported by pipelines in a regional cooling system

Abstract

The present invention discloses a device and method for adjusting the concentration of ice slurry transported by pipelines of a regional cooling system, wherein the device comprises an adjusting inner tube, one end of the adjusting inner tube being an inlet section, and the other end being an outlet section, an overflow section located in an outer shell of the adjusting inner tube being provided between the inlet section and the outlet section, the overflow section being provided with multiple rows of overflow holes, the outer walls of the multiple rows of overflow holes being slidably connected with anti-blocking scrapers, the anti-blocking scrapers being connected to a scraper driving mechanism, and a recovery outlet pipe being connected to the bottom of the outer shell of the adjusting inner tube. When the load of the end-user building changes, the present invention can avoid the latent heat loss and pipeline blockage risk caused by the quality regulation and quantity regulation of the regional cooling system, and improve the energy saving and applicability of the ice slurry concentration adjusting device and method. To provide engineering technical support for improving the cold transport efficiency of the transmission and distribution pipeline network of the regional cooling system.

Description

Technical Field

[0001] The present invention relates to the technical field of regional cooling, and in particular to a device and method for adjusting the concentration of ice slurry transported by pipelines of a regional cooling system. Background Art

[0002] As an advanced centralized air conditioning solution, district cooling has been widely used in urban central business districts with high volume ratio, load density and load rate. However, the cold transport efficiency of the distribution network is an important indicator for evaluating the economic efficiency of the district cooling system. In order to improve the cold transport efficiency of the distribution network, replacing traditional chilled water with high energy-carrying media and cooling user buildings with phase change full heat instead of temperature difference sensible heat have become new driving forces for the development of district cooling system technology to reduce carbon emissions.

[0003] Ice slurry is a new type of high-energy medium, composed of ice particles and pure water or aqueous solution with solidification inhibition, with good thermal properties, transmission and phase change characteristics. There are many engineering cases in the world that use the high-energy characteristics of ice slurry to improve the economic efficiency of regional cooling systems. For example, a business district in Osaka, Japan combines ice slurry cold storage with regional cooling, with a load transfer rate of 81%, and air conditioning equipment energy consumption is reduced by 8-12.5W / m compared with conventional systems. 2 A university in Virginia, USA, uses an ice slurry cooling system to cover an area of ​​18,000m 2 The cooling load of the gymnasium saves nearly $75,000 in annual operating costs. A digital media city in Seoul, South Korea, directly uses ice slurry instead of chilled water to cool user buildings to improve system capacity, greatly alleviating the contradiction between limited space, existing pipe networks and the growing demand for cooling. China is actively exploring the use of ice slurry for centralized cooling in urban rail transit. Studies have shown that the use of ice slurry for centralized cooling in multiple subway stations in climate zones represented by Guangzhou can reduce secondary pipe network investment and operating costs, and the advantages become more significant as the cooling period, service load and radius increase.

[0004] Although the application of ice slurry in district cooling system has significant advantages, it still faces many challenges. One of them is how to efficiently transport ice slurry with phase slip characteristics to end-user buildings through secondary pipe networks. In particular, when the load of the end-user building changes, real-time adjustment of the cold transport capacity of the district cooling system pipeline is an effective measure for energy-saving operation. Generally, the regulation of the cold transport capacity of the district cooling system pipeline can be divided into quality regulation and quantity regulation. Quality regulation refers to adjusting the ice slurry temperature according to the load change of the end-user building. However, ice slurry is a phase change fluid, and the temperature of the ice particles in the slurry is basically constant when the phase changes. If the ice slurry temperature is increased by quality regulation, all the ice particles need to be melted, resulting in a large amount of latent heat loss. Quantity regulation refers to adjusting the ice slurry pipeline transport flow rate according to the building load while maintaining the ice slurry temperature unchanged. Although quantity regulation does not involve the latent heat loss of ice particles, it is easy to cause non-homogeneous stratified flow during flow regulation, inducing pipeline blockage. Therefore, it is of great engineering value to overcome the shortcomings of traditional quality regulation and quantity regulation and develop a device and method for regulating the concentration of ice slurry in pipeline transportation with certain energy saving and applicability. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for regulating the concentration of ice slurry transported by pipelines in a regional cooling system. When the load on the end-user building increases, the online regulation of the ice slurry concentration can be achieved without changing the temperature and flow rate of the ice slurry, thereby greatly improving the energy saving and applicability of the ice slurry concentration regulating device and method.

[0006] To achieve the above-mentioned purpose, the present application proposes a device for regulating the concentration of ice slurry transported in the pipeline of a regional cooling system, comprising an adjusting inner tube, one end of the adjusting inner tube being an inlet section, and the other end being an outlet section, an overflow section located in an outer shell of the adjusting inner tube is provided between the inlet section and the outlet section, the overflow section is provided with multiple rows of overflow holes, the outer walls of the multiple rows of overflow holes are slidably connected with anti-blocking scrapers, the anti-blocking scrapers are connected to a scraper driving mechanism, and a recovery outlet pipe is connected to the bottom of the outer shell of the adjusting inner tube.

[0007] Furthermore, the inlet section is a gradually expanding inlet section, and the outlet section is a gradually converging outlet section.

[0008] Furthermore, an inlet flange is provided at the end of the gradually diverging inlet section, and the inlet flange is connected to an ice slurry conveying main pipe having a flange at the end thereof through an inlet sealing gasket.

[0009] Furthermore, an outlet flange is provided at the end of the tapered outlet section, and the outlet flange is connected to the ice slurry conveying main pipe with a flange at the end through an outlet sealing gasket, a heating gasket, an insulating gasket and a sealing gasket in sequence.

[0010] Furthermore, the ice slurry delivery main pipe is connected to the ice slurry storage tank, and an ice slurry delivery pump, a pressure sensor, and a mass flow meter are provided on the ice slurry delivery main pipe, and valves are provided on both sides of the mass flow meter.

[0011] Furthermore, the recovery outlet pipe is connected to the ice slurry recovery discharge pipe through an ice slurry recovery main pipe, and valves are provided on the ice slurry recovery main pipe and the ice slurry recovery discharge pipe.

[0012] Furthermore, an ice slurry recovery branch pipe is connected between the ice slurry recovery main pipe and the ice slurry recovery discharge pipe, and the ice slurry recovery branch pipe is connected to the ice slurry storage tank. A mass flow meter, a pressure sensor, and an ice slurry recovery pump are provided on the ice slurry recovery branch pipe, and valves are provided on both sides of the mass flow meter.

[0013] The present invention also provides a method for adjusting the concentration of ice slurry transported by a pipeline of a regional cooling system, comprising:

[0014] When the cooling load of the end-user building increases, the cooling demand of the cooling user increases;

[0015] The inner tube is adjusted to filter and separate the ice slurry flowing into it through the overflow hole to the carrier solution, thereby increasing the concentration of the ice slurry flowing through the overflow section;

[0016] The anti-blocking scraper moves back and forth along the outer surface of the overflow section under the action of the scraper driving mechanism, thereby scraping off the ice particles attached to the overflow hole;

[0017] The filtered carrier solution and part of the ice particles flow through the recovery outlet pipe, from the ice slurry recovery main pipe to the ice slurry recovery branch pipe, and finally enter the ice slurry storage tank for reuse.

[0018] Furthermore, when the amount of the filtered carrier solution and some ice particles is small, they are directly discharged on-site through the ice slurry recovery and discharge pipe.

[0019] Furthermore, when ice particles accumulate in the tapered outlet section of the conveying and regulating inner pipe, the power connection of the heating pad is turned on to perform unidirectional heating.

[0020] Compared with the prior art, the above technical solution adopted by the present invention has the following advantages: when the load of the end-user building changes, the present invention can avoid the loss of latent heat and cold caused by the quality and quantity regulation of the regional cooling system and the risk of induced pipeline blockage, and improve the energy saving and applicability of the ice slurry concentration regulating device and method. It provides engineering technical support for improving the cold transmission efficiency of the regional cooling system transmission and distribution pipeline network. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a diagram of a district cooling system equipped with an ice slurry concentration regulating device;

[0022] Figure 2 This is the appearance diagram of the ice slurry concentration regulating device;

[0023] Figure 3 is a cross-sectional view of an ice slurry concentration regulating device;

[0024] Figure 4 This is the front view of the ice slurry concentration regulating device;

[0025] Figure 5 This is the detailed drawing of the inlet pipe of the ice slurry concentration regulating device;

[0026] Figure 6 This is a detailed view of the outlet pipe of the ice slurry concentration regulating device.

[0027] Explanation of the serial numbers in the figure: 1 ice slurry machine, 2 ice slurry circulation supply pipe, 3 valve, 4 ice slurry storage tank, 5 ice slurry circulation return pipe, 6 ice slurry circulation discharge pipe, 7 ice slurry delivery main pipe, 8 ice slurry delivery pump, 9 ice slurry delivery bypass pipe, 10 pressure sensor, 11 mass flow meter, 12 ice slurry concentration regulating device, 13 ice slurry recovery main pipe, 14 ice slurry recovery branch pipe, 15 ice slurry recovery discharge pipe, 16 temperature sensor, 17 heat exchanger; 12a gradually expanding inlet section, 12b gradually contracting outlet section, 12c recovery outlet section pipe, 12d overflow section, 12e anti-blocking scraper, 12f scraper drive mechanism, 12g drive mechanism power connection. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0029] Example 1

[0030] In order to clearly describe the setting position and working method of the ice slurry concentration regulating device in the district cooling system pipeline, Figure 1 A district cooling system equipped with an ice slurry concentration regulating device is given. Figure 1 As shown in FIG. 1 , the district cooling system equipped with an ice slurry concentration regulating device mainly includes the following Figure 1As shown, this embodiment provides a regional cooling system diagram, including an ice slurry machine and an ice slurry storage tank, wherein the outlet of the ice slurry machine is connected to the inlet of the ice slurry storage tank through an ice slurry circulation supply pipe, and one of the return ports of the ice slurry storage tank is connected to the inlet of the ice slurry machine through an ice slurry circulation return pipe, and the ice slurry machine is also connected to an ice slurry circulation discharge pipe, and valves are provided on the ice slurry circulation supply pipe, the ice slurry circulation return pipe, and the ice slurry circulation discharge pipe; the outlet of the ice slurry storage tank is connected to the inlet of the ice slurry concentration regulating device through an ice slurry delivery main pipe, and the outlet of the ice slurry concentration regulating device is connected to the heat exchanger through a pressure sensor, a temperature sensor, and a valve. An ice slurry delivery pump, a pressure sensor, and a mass flow meter are provided on the ice slurry delivery main pipe, and valves are provided on both sides of the mass flow meter. The other outlet of the ice slurry storage tank is connected between the ice slurry delivery pump and the pressure sensor on the ice slurry delivery main pipe through an ice slurry delivery bypass pipe.

[0031] The ice slurry concentration regulating device comprises an regulating inner tube, one end of the regulating inner tube is an inlet section, and the other end is an outlet section, an overflow section located in the outer shell of the regulating inner tube is arranged between the inlet section and the outlet section, the overflow section is distributed with multiple rows of overflow holes, and the outer wall of the multiple rows of overflow holes is slidably connected with an anti-blocking scraper, the anti-blocking scraper is connected to a scraper driving mechanism located in the outer shell of the regulating inner tube, the scraper driving mechanism comprises a spring rod, a two-way driving cam, a motor and a driving mechanism power connection, a two-way driving cam is arranged on the output shaft of the motor, the two-way driving cam is connected to the anti-blocking scraper through the spring rod, and the driving mechanism power connection is connected to the power supply; a recovery outlet pipe is connected to the bottom of the outer shell of the regulating inner tube. The recovery outlet pipe is connected to the ice slurry recovery slurry discharge pipe through an ice slurry recovery main pipe, and valves are arranged on the ice slurry recovery main pipe and the ice slurry recovery slurry discharge pipe. An ice slurry recovery branch pipe is connected between the ice slurry recovery main pipe and the ice slurry recovery discharge pipe. The ice slurry recovery branch pipe is connected to the ice slurry storage tank. A mass flow meter, a pressure sensor, and an ice slurry recovery pump are arranged on the ice slurry recovery branch pipe. Valves are arranged on both sides of the mass flow meter.

[0032] Preferably, the inlet section is a gradually diverging inlet section, and the outlet section is a gradually converging outlet section.

[0033] The specific method of using the ice slurry concentration regulating device to regulate the concentration of ice slurry transported in the pipeline of the regional cooling system is as follows. When the cooling load of the end-user building increases, the cooling capacity required by the cooling users increases. The ice slurry concentration regulating device 12 filters and separates the ice slurry flowing into it through the overflow hole 12h and the carrier solution, thereby increasing the concentration of the ice slurry flowing through the overflow section 12d. In order to prevent ice particles from blocking the overflow hole 12h, the anti-blocking scraper 12e reciprocates along the outer surface of the overflow section 12d under the action of the scraper driving mechanism 12f, thereby scraping off the ice particles attached to the overflow hole 12h. The filtered carrier solution and part of the ice particles are recovered through the outlet section pipe 12c, and flow into the ice slurry recovery branch pipe 14 from the ice slurry recovery main pipe 13, and finally enter the ice slurry storage tank 4 for reuse, thereby avoiding the waste of cooling capacity. When the amount of the filtered carrier solution and part of the ice particles is small, they can be directly discharged and utilized on site through the ice slurry recovery slurry discharge pipe 15.

[0034] In addition, in order to prevent the phase slip between ice particles and the carrier solution from causing ice particles to aggregate and block the pipeline, a gradually expanding inlet section 12a and a gradually contracting outlet section 12b are respectively added to the inlet and outlet of the ice slurry concentration regulating device 12, thereby ensuring that the geometric space for the carrier solution filtration and separation process is large enough. At the same time, when the outlet of the ice slurry concentration regulating device 12 is connected to the ice slurry conveying main pipe 7, a heating pad 23 and a heat insulating pad 24 are added to achieve unidirectional heating of the gradually contracting outlet section 12b of the ice slurry concentration regulating device 12. Once ice particles aggregate in the gradually contracting outlet section 12b of the ice slurry concentration regulating device 12, the power connection 27 of the heating pad 23 can be quickly connected, greatly reducing the risk of pipeline blockage failure.

[0035] In a regional cooling system, when the load on the end-user building increases, it is necessary to adjust the cooling capacity carried by the ice slurry in the pipeline to meet the cooling demand of the user. The existing quality regulation and quantity regulation methods are prone to cause a large amount of latent heat cooling loss or induce pipeline blockage. The present invention adds an ice slurry concentration regulating device to the regional cooling system and performs unidirectional heating at the outlet of the ice slurry concentration regulating device. It not only ensures that there is no energy loss in the regulation process, but also effectively reduces the risk of pipeline blockage. Therefore, the energy saving and applicability of the ice slurry concentration regulating device and method for pipeline transportation in the regional cooling system can be significantly improved.

[0036] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A method for regulating the concentration of ice slurry transported by a pipeline in a regional cooling system, characterized in that: When the cooling load of the end-user building increases, the cooling demand of the cooling users increases; The inner tube is adjusted to filter and separate the ice slurry flowing into it through the overflow hole to the carrier solution, thereby increasing the concentration of the ice slurry flowing through the overflow section; The anti-blocking scraper moves back and forth along the outer surface of the overflow section under the action of the scraper driving mechanism, thereby scraping off the ice particles attached to the overflow hole; The filtered carrier solution and some ice particles flow through the recovery outlet pipe, the ice slurry recovery main pipe and the ice slurry recovery branch pipe, and finally enter the ice slurry storage tank for reuse; The above method is implemented in a device for adjusting the concentration of ice slurry transported in the pipeline of a regional cooling system, the device comprising an adjusting inner tube, one end of the adjusting inner tube being an inlet section, and the other end being an outlet section, an overflow section located in an outer shell of the adjusting inner tube being provided between the inlet section and the outlet section, the overflow section being provided with multiple rows of overflow holes, the outer walls of the multiple rows of overflow holes being slidably connected with anti-blocking scrapers, the anti-blocking scrapers being connected to a scraper driving mechanism, and a recovery outlet pipe being connected to the bottom of the outer shell of the adjusting inner tube.

2. A method for adjusting the concentration of ice slurry transported by pipelines in a regional cooling system according to claim 1, characterized in that: When ice particles gather at the tapered outlet section of the regulating inner tube, the power connection of the heating pad is turned on to perform unidirectional heating.

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