A condensate water recovery apparatus and system suitable for use in a carbonate production system

Abstract

The application belongs to the technical field of carbonate synthesis, and discloses a condensate water recovery device suitable for a carbonate production system, which is connected with a condensing device and a water reheater respectively, and comprises a backwater pipe, a backwater branch pipe, a water storage device and one or more drain pipes; the drain pipe is connected to the backwater branch pipe, one end of the backwater branch pipe is connected to the water storage device, and the other end is connected to the backwater pipe; and a steam pipe is further connected to the water storage device. The device collects the condensate water introduced by the drain pipe into the water storage device through the self weight of the condensate water, inputs the pressurized steam through the steam pipe, and blows the condensate water in the water storage device into the backwater pipe, so that the condensate water enters the backwater pipe regularly to facilitate subsequent reheating. In this process, heat loss is small, there is no white mist, the condensate water generated by the drain pipe can be continuously collected, the drain pipe is not blocked, no additional pump is needed in the scheme, the system complexity is reduced, and in addition, the utility model is especially suitable for the needs of condensation of multiple process nodes of the carbonate production system, and can adapt to the condensate water recovery of multiple condensing devices. Meanwhile, the utility model further provides a condensate water reheating system.

Description

Technical Field

[0001] This utility model relates to the field of carbonate synthesis technology, and in particular to a condensate recovery device and a condensate reheating system suitable for carbonate production systems. Background Technology

[0002] Carbonates are a class of compounds with important applications in electrolytes. For example, dimethyl carbonate (DMC), ethylene carbonate (EC), and propylene carbonate (PC) are core solvents in lithium-ion battery electrolytes. They possess characteristics such as high dielectric constant, low viscosity, and a wide electrochemical window, which can effectively improve ion conductivity and battery cycle stability to meet the needs of different types of batteries. In lithium-ion batteries, the EC-DMC mixed solvent system exhibits excellent overall performance, capable of forming a stable solid electrolyte interphase (SEI) film on the electrode surface, thereby improving the battery's cycle performance and safety.

[0003] Carbonates are generally synthesized using methods such as oxidative carbonylation and transesterification. The separation and recovery of reaction products, solvent or raw material recovery, and byproduct treatment all involve the use of condensation devices, generating a large amount of condensate. Recycling this condensate allows for its reuse, reducing energy waste. There are generally two ways to utilize recycled condensate in factories: as high-purity desalinated water or by reheating it to produce steam. Heating condensate to steam eliminates the need for desalination, effectively reducing steam production costs—a design commonly used in modern factories.

[0004] It has the following visible technologies:

[0005] The patent application with publication number JP2000257806A, which is for a heat exchanger drainage recovery system, describes that: the condensate tank supplies water to the boiler through the heat exchanger, and then supplies it to the deaerator.

[0006] Patent application CN115234891A, entitled "Exhaust Steam Flash Regeneration Generator," discloses a scheme for generating high-temperature gas by heating condensate with steam.

[0007] In existing technologies, most focus is on how condensate is regenerated by steam. Condensate is usually collected using a condensate tank, and condensate is drawn from the condensate tank for heating.

[0008] In a factory environment, the above solution has the following drawbacks: 1. In most factories, the steam traps on the drain pipes are about 2 meters above the ground, and the main line of the return branch pipe in the pipe gallery is even higher. The condensate generated by the steam traps can mostly only be discharged on-site; 2. In some technical solutions, the water from the steam traps is collected into a condensate tank. Since the condensate contains a small amount of steam, the condensate tank must have a vent to allow it to communicate with the atmosphere. Therefore, in winter and autumn, most factories' condensate tanks will produce a lot of white mist; 3. If the condensate is to be regenerated into steam, there will be continuous heat loss during the collection and storage of the condensate. Utility Model Content

[0009] The purpose of this invention is to provide a condensate recovery device suitable for carbonate production systems. This device collects condensate introduced through a drain pipe into a storage tank by its own weight. Pressurized steam is then introduced through a steam pipe to blow the condensate in the storage tank into a return water branch pipe, enabling the periodic entry of condensate into the return water branch pipe for subsequent reheating. During this process, heat loss is minimal, there is no white mist, and condensate generated by the drain pipe is continuously collected without causing blockage. This solution eliminates the need for additional pumps, reducing system complexity. Furthermore, this invention is particularly suitable for the condensation requirements of multiple process nodes in carbonate production systems and can be adapted to condensate recovery from multiple condensation units.

[0010] In addition, this utility model also provides a condensate reheating system.

[0011] To achieve the above objectives, this application discloses a condensate recovery device suitable for a carbonate production system, which is connected to a condensation unit and a water reheater, and includes a return water pipe, a return water branch pipe, a water storage tank, and one or more drain pipes; the drain pipe is connected to the return water branch pipe, one end of the return water branch pipe is connected to the water storage tank, and the other end is connected to the return water pipe; a steam pipe is also connected to the water storage tank.

[0012] The condensate generated by the condensation device enters the return water branch pipe through the drain pipe and is collected in the water storage tank by its own gravity.

[0013] The condensate in the water tank is intermittently blown into the return water pipe and into the water reheater by the steam input from the steam pipe.

[0014] In the aforementioned condensate recovery device for carbonate production systems, the height of the water reservoir is lower than the height of the connection point between the drain pipe and the return water branch pipe; the height of the connection point between the water reservoir and the return water branch pipe is lower than the height of the connection point between the drain pipe and the return water branch pipe.

[0015] In the aforementioned condensate recovery device for carbonate production systems, a first solenoid valve is connected to the return water branch pipe, and a second solenoid valve is connected to the steam pipe; the connection point between the drain pipe and the return water branch pipe is located between the first solenoid valve and the water storage tank.

[0016] In the aforementioned condensate recovery device for carbonate production systems, a level sensor is connected to a preset height position on the return water branch pipe; the first solenoid valve and the second solenoid valve open simultaneously based on the signal from the level sensor.

[0017] The aforementioned condensate recovery device for carbonate production systems also includes a relay and a power supply. The power supply powers the relay, the first solenoid valve, and the second solenoid valve. The relay is connected in series in the circuits of the first solenoid valve and the power supply, and in the circuits of the second solenoid valve and the power supply. The power supply supplies power to the relay according to the electrical signal generated by the liquid level sensor, so that the relay closes and the first and second solenoid valves are energized.

[0018] In the aforementioned condensate recovery device for carbonate production systems, the level sensor is connected to the return water branch pipe via a branch pipe, and the branch pipe is equipped with a first manual valve; the bottom of the water tank is equipped with a second manual valve for drainage; the steam pipe is equipped with a third manual valve, and the drain pipe is equipped with a fourth manual valve.

[0019] In the aforementioned condensate recovery device for carbonate production systems, the water reservoir is a tubular body.

[0020] In the aforementioned condensate recovery device for carbonate production systems, the water storage tank is a vertically arranged tubular body.

[0021] In the aforementioned condensate recovery device for carbonate production systems, the main diameter of the water reservoir is larger than the diameter of the return water branch pipe; the water reservoir and the return water branch pipe are connected by a tapering pipe.

[0022] Meanwhile, this utility model also discloses a condensate reheating system suitable for carbonate production systems, including a condensing device, a water reheater, and a condensate recovery device as described above; the condensate generated by the condensing device enters a drain pipe, and the water reheater is used to heat the condensate into steam at a preset pressure, or to heat the condensate into hot water at a preset temperature, which is then reheated by an external steam generator to become steam at a preset pressure.

[0023] The beneficial effects of this application are:

[0024] 1. This solution takes into full account the design height of the factory's steam traps and sets up a water storage tank at a lower position to collect condensate by its own weight.

[0025] 2. This solution uses steam purging to send the condensate in the water tank into the return water branch pipe, which has two advantages: no power pump is required, which can reduce the complexity of the system; at the same time, the condensate can be reheated, which reduces the heat loss caused by continuous storage of condensate and the energy consumption when the condensate is reheated.

[0026] 3. It can continuously collect condensate produced by the steam trap, avoiding problems such as pipe blockage and steam trap blockage due to water accumulation.

[0027] 4. This solution is particularly suitable for the condensation requirements of multiple process nodes in carbonate production systems and can be adapted to the condensate recovery of multiple condensation units. Attached Figure Description

[0028] Figure 1 This is a pipeline flow diagram for Example 1;

[0029] Figure 2 This is a control circuit diagram of the first and second solenoid valves in Example 1;

[0030] Figure 3 The diagrams are for Example 1 and Example 2. Detailed Implementation

[0031] The present invention will now be clearly and completely described in conjunction with its embodiments. It should be noted that, in this description, unless specific conditions are specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0032] Example 1

[0033] refer to Figure 1 and Figure 3 A condensate recovery device suitable for a carbonate production system is provided, which is connected to a condenser 19 and a water reheater 17 respectively. It includes a return water pipe 18, a return water branch pipe 1, a water storage tank 2, and multiple drain pipes 3. The drain pipes 3 are connected to the return water branch pipe 1. One end of the return water branch pipe 1 is connected to the water storage tank 2 and the other end is connected to the return water pipe 18. A steam pipe 4 is also connected to the water storage tank 2.

[0034] The condensate generated by the condensation device 19 enters the return water branch pipe 1 through the drain pipe 3 and is collected in the water storage tank 2 by its own gravity.

[0035] The condensate in the water storage tank 2 is intermittently blown into the return water pipe 18 and into the water reheater 17 through the return water branch pipe 1, driven by the steam input from the steam pipe 4.

[0036] Implicitly, a drain valve 15 is connected to the drain pipe 3;

[0037] It should be noted that in the carbonate production system, the separation and recovery of reaction products, the recovery of solvents or raw materials, and the treatment of by-products all involve the use of condensation device 19. This also means that there are a large number of condensate drain pipes 3 in the production system of this utility model. This solution can significantly reduce the complexity of the pipeline and improve the efficiency of condensate recovery by connecting all the condensate drain pipes 3 to the return water branch pipe 1.

[0038] In this embodiment, there are many ways to implement the intermittent function. For example, a valve that can be opened periodically can be installed on the steam pipe 4 to periodically blow the condensate in the water tank 2 into the return water branch pipe 1; or the method described later, which controls the solenoid valve on the steam pipe 4 to open periodically based on detecting the liquid level of the water tank 2, can also be used.

[0039] In this embodiment, the working process of the above-mentioned device is as follows: the condensate drainer on the condensate drain pipe 3 continuously discharges the condensate generated by the condensation device 19 into the return water branch pipe 1, and flows into the water storage tank 2 by gravity. The water storage tank 2 continuously collects the condensate. After a certain amount of condensate is collected, the steam pipe 4 is opened. The steam pipe 4 contains pressurized and dry steam. The steam blows the condensate through the return water branch pipe 1 into the return water pipe 18 and along the return water pipe 18, and finally into the water reheater 17.

[0040] More specifically, preferably, the water reheater 17 is connected to one end of the return water pipe 18; the height of the water storage tank 2 is lower than the height of the connection between the drain pipe 3 and the return water branch pipe 1; the height of the connection between the water storage tank 2 and the return water branch pipe 1 is lower than the height of the connection between the drain pipe 3 and the return water branch pipe 1.

[0041] The return water branch pipe 1 is connected to a first solenoid valve 5, and the steam pipe 4 is connected to a second solenoid valve 6; the connection point between the drain pipe 3 and the return water branch pipe 1 is located between the first solenoid valve 5 and the water storage device 2.

[0042] The first solenoid valve 5 and the second solenoid valve 6 are generally in a linked state, opening or closing simultaneously. When open, the water reservoir 2 is in a steam purging state, and when closed, the water reservoir 2 is in a condensate collection state. Implicitly, if condensate is to continuously enter the water reservoir 2, the water reservoir 2 needs to maintain air pressure balance through a breather valve or a one-way valve connected to the atmosphere. Preferably, the breather valve or one-way valve can be installed on the branch pipe 10 described later.

[0043] Preferably, in this embodiment, the first solenoid valve 5 and the second solenoid valve 6 are controlled in conjunction by detecting the liquid level in the water storage tank 2. Specifically, a liquid level sensor 7 is connected to a preset height position on the return water branch pipe 1; the first solenoid valve 5 and the second solenoid valve 6 open simultaneously based on the signal from the liquid level sensor 7. At the circuit level, refer to... Figure 2 The control circuit specifically includes a relay 8 and a power supply 9 (24V). The power supply 9 supplies power to the relay 8, the first solenoid valve 5, and the second solenoid valve 6. The relay 8 is connected in series in the circuits of the first solenoid valve 5 and the power supply 9, and in the circuits of the second solenoid valve 6 and the power supply 9. The power supply 9 supplies power to the relay 8 according to the electrical signal generated by the liquid level sensor 7, causing the relay 8 to close and the first solenoid valve 5 and the second solenoid valve 6 to be energized. During operation, the liquid level sensor 7 generates an electrical signal, the power supply 9 supplies power to the relay 8, the relay 8 contacts close, the two circuits are connected, the first solenoid valve 5 and the second solenoid valve 6 are energized and opened, and steam purging begins.

[0044] Preferably, the liquid level sensor 7 is connected to the return water branch pipe 1 via a branch pipe 10, and the branch pipe 10 is equipped with a first hand valve 11; the bottom of the water reservoir 2 is equipped with a second hand valve 12 for drainage; the steam pipe 4 is equipped with a third hand valve 13, and the drain pipe 3 is equipped with a fourth hand valve 14. As described above, a breather valve or a check valve is also preferably provided on the branch pipe 10.

[0045] During actual testing, we found that the structure of the water storage tank 2 is preferably tubular. This tubular container needs to have a certain volume, that is, the diameter of the water storage tank 2 should be larger. However, it is not recommended that the diameter be too large, as this would result in less condensate being carried out during steam purging, thus increasing the amount of steam used.

[0046] Specifically, the water storage device 2 is a vertically arranged tubular body, and the main body diameter of the water storage device 2 is larger than the diameter of the return water branch pipe 1; the water storage device 2 and the return water branch pipe 1 are connected by a tapering pipe 16.

[0047] In actual testing, we recommend that the diameter of the water reservoir 2 be 5 to 20 cm and the diameter of the return water branch pipe 1 be 2 to 5 cm, while keeping the diameter of the water reservoir 2 larger than the diameter of the return water branch pipe 1.

[0048] This pipe diameter design facilitates the smooth flow of pressurized steam into the return water branch pipe 1. Furthermore, the tapered pipe increases the steam velocity and allows the steam to carry the condensate smoothly into the return water branch pipe 1.

[0049] Example 2

[0050] refer to Figure 3A condensate reheating system suitable for carbonate production systems includes a condenser 19, a water reheater 17, and a condensate recovery device as described in Example 1. The condensate generated by the condenser 19 enters a drain pipe 3. The water reheater heats the condensate blown in by the return water branch pipe 1 into hot water at a preset temperature. This hot water is then reheated by an external steam generator to become steam at a preset pressure.

Claims

1. A condensate recovery device suitable for a carbonate production system, which is connected to a condensation unit and a water reheater respectively, characterized in that, It includes a return water pipe, a return water branch pipe, a water storage tank, and one or more drain pipes; one end of the return water branch pipe is connected to the water storage tank and the other end is connected to the return water pipe, and the drain pipe is connected to the return water branch pipe; a steam pipe is also connected to the water storage tank. The condensate generated by the condensation device enters the return water branch pipe through the drain pipe and is collected in the water storage tank by its own gravity. The condensate in the water storage tank is intermittently blown into the return water pipe and into the water reheater by the steam input from the steam pipe.

2. The condensate recovery device for a carbonate production system according to claim 1, characterized in that, The water storage device is positioned at a height lower than the connection point between the drain pipe and the return branch pipe; the connection point between the water storage device and the return branch pipe is also lower than the connection point between the drain pipe and the return branch pipe.

3. The condensate recovery device for a carbonate production system according to claim 1, characterized in that, A first solenoid valve is connected to the return water branch pipe, and a second solenoid valve is connected to the steam pipe; the connection point between the drain pipe and the return water branch pipe is located between the first solenoid valve and the water storage device.

4. The condensate recovery device for a carbonate production system according to claim 3, characterized in that, A liquid level sensor is connected to a preset height position on the return water branch pipe; the first solenoid valve and the second solenoid valve open simultaneously according to the signal from the liquid level sensor.

5. The condensate recovery device for a carbonate production system according to claim 4, characterized in that, It also includes a relay and a power supply, wherein the power supply supplies power to the relay, the first solenoid valve, and the second solenoid valve, and the relay is connected in series in the circuit of the first solenoid valve and the power supply, and in the circuit of the second solenoid valve and the power supply; the power supply supplies power to the relay according to the electrical signal generated by the liquid level sensor so that the relay is closed and the first solenoid valve and the second solenoid valve are energized.

6. The condensate recovery device for a carbonate production system according to claim 3, characterized in that, The liquid level sensor is connected to the return water branch pipe via a branch pipe, and the branch pipe is equipped with a first manual valve; the bottom of the water storage device is equipped with a second manual valve for drainage; the steam pipe is equipped with a third manual valve, and the drain pipe is equipped with a fourth manual valve.

7. The condensate recovery device for a carbonate production system according to any one of claims 1 to 6, characterized in that, The water storage device is a tubular body.

8. The condensate recovery device for a carbonate production system according to claim 7, characterized in that, The water storage device is a vertically arranged tubular body.

9. The condensate recovery device for a carbonate production system according to claim 7, characterized in that, The main body diameter of the water storage device is larger than the diameter of the return water branch pipe; the water storage device and the return water branch pipe are connected by a tapering pipe.

10. A condensate reheating system suitable for carbonate production systems, characterized in that, It includes a condensing device, a water reheater, and a condensate recovery device as described in any one of claims 1 to 9; the condensate generated by the condensing device enters a drain pipe, and the water reheater is used to heat the condensate into steam at a preset pressure, or to heat the condensate into hot water at a preset temperature, which is then reheated by an external steam generator to become steam at a preset pressure.

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