A system and process for flexible control of liquid delivery and return

Abstract

This invention discloses a system and process for flexibly controlling liquid delivery and recirculation, relating to the field of fuel delivery system technology. The system includes a first booster pump, a second booster pump, a first fuel storage tank, a second fuel storage tank, a fuel recirculation pipeline, and a booster pipeline. The first and second fuel storage tanks are connected to the inlets of the first and second booster pumps via the booster pipeline, and the outlets of the first and second booster pumps are connected to the first and second fuel storage tanks via the fuel recirculation pipeline. The system and process for flexibly controlling liquid delivery and recirculation in this invention enables flexible control of fuel delivery and recirculation processes. By controlling the delivery of alcohol-based fuels, it achieves risk prevention, simplification, and temperature control, and allows for easy switching to meet usage requirements. It also reduces the need for fuel booster pumps and allows for redundant configuration, reducing the risk of modifying the operating equipment.

Description

Technical Field

[0001] This invention relates to the field of fuel delivery system technology, and in particular to a system and process for flexibly controlling liquid delivery and recirculation. Background Technology

[0002] The general structure of a hazardous waste incineration system is a rotary kiln + secondary combustion chamber. According to the "Standard for Pollution Control of Hazardous Waste Incineration" (GB18484-2020), the temperature of the high-temperature section of the furnace must be ≥1100℃. Therefore, the operating temperature of the secondary combustion chamber must be ≥1100℃. Based on the requirements for hazardous waste entering the incineration site, the calorific value of the hazardous waste entering the furnace is approximately 3000 Kcal / Kg. To ensure the high-temperature section temperature of the furnace is ≥1100℃, effectively incinerate the harmful components of the hazardous waste, and ensure that flue gas emissions meet standards, hazardous waste treatment enterprises typically use auxiliary fuel for co-firing in their incineration systems. This ensures that the operating temperature of the incineration system complies with the "Standard for Pollution Control of Hazardous Waste Incineration" (GB18484-2020). According to the original design, diesel fuel was used for co-firing in the secondary combustion chamber of the incineration unit, but this was costly. See the following economic benefit analysis for details:

[0003] When the incineration system is normally disposing of hazardous waste, the furnace temperature is approximately 750℃ (±30℃), and the flue gas volume is approximately 15000 Nm³. 3 The specific heat capacity of air is 1.0 × 10³ J / (kg·℃), and its density is approximately 1.29 kg / m³. 3 .

[0004] (1) If diesel fuel (calorific value: 4.6*107J / kg, unit price excluding tax: 6833 yuan / ton) is used as the accompanying fuel, meeting the requirement of furnace temperature above 1100℃ in the "Standard for Pollution Control of Hazardous Waste Incineration" (18484-2020), the hourly diesel fuel consumption is:

[0005] 1.0×10³ J / (kg·℃)*1.29 kg / Nm 3 *15000Nm 3 *(1100℃-750℃)÷4.6*107J / kg

[0006] =147.23kg

[0007] That is, the daily cost of burning diesel fuel is: 24,145 yuan (147.23 kg / h * 6.833 yuan / kg * 24h).

[0008] (2) Under the condition that the process parameters remain unchanged, if natural gas (calorific value: 3.7*107J / kg, unit price excluding tax: 3.7 yuan / kg) is used as the co-firing fuel, the hourly consumption of natural gas is:

[0009] 1.0×10³ J / (kg·℃)*1.29 kg / Nm 3 *15000Nm 3 *(1100℃-750℃)÷3.7*107J / kg

[0010] =138.04kg

[0011] That is, the daily cost of using natural gas for combustion is: 12,258 yuan (138.04 kg / h * 3.7 yuan / kg * 24h).

[0012] (3) Under the condition that the process parameters remain unchanged, if the co-firing fuel is alcohol-based liquid fuel (calorific value: 2.2*107J / kg, unit price excluding tax: 1.5 yuan / kg), the hourly consumption of alcohol-based liquid fuel is:

[0013] 1.0×10³ J / (kg·℃)*1.29 kg / Nm 3 *15000Nm3*(1100℃-750℃)÷2.2*107J / kg

[0014] = 307.84 kg

[0015] That is, the daily co-firing cost of alcohol-based liquid fuel is: 6780 yuan (307.84 kg / h * 0.9177 yuan / kg * 24h).

[0016] In summary, to reduce costs and increase efficiency, from a cost perspective, using alcohol-based liquid fuel for the secondary combustion chamber is the most cost-effective option, with a cost of approximately 6,780 yuan per day.

[0017] However, during the original diesel transportation process, the diesel temperature reaches over 80°C when it returns to the fuel storage tank via the shielded pump and return pipeline. The temperature rises even faster when the tank level is low, posing a significant risk to the storage and transportation of alcohol-based fuels. If more economical alcohol-based liquid fuels are used, their characteristics include a low flash point (only 60°C) and high volatility. Operating them at high temperatures with co-fuels presents significant safety hazards, and the safety risks are uncontrollable.

[0018] Therefore, a flexible process for controlling liquid delivery and reflux is needed. This process, through valve operation, allows for flexible control of alcohol-based fuel delivery and reflux, aiming to mitigate risks, simplify operations, and control temperature, thereby ensuring the safe and stable operation of the co-firing fuel system. Summary of the Invention

[0019] To address the above technical problems, this invention provides a system and process for flexibly controlling liquid delivery and reflux. By flexibly controlling the delivery and reflux of alcohol-based fuel through valve operation, it achieves the goals of risk prevention, simplification, and temperature control, thereby ensuring the safe and stable operation of the co-firing fuel system.

[0020] To achieve the above objectives, the present invention provides the following solution:

[0021] This invention provides a system for flexibly controlling liquid delivery and return, comprising a first booster pump, a second booster pump, a first fuel storage tank, a second fuel storage tank, a fuel return line, and a booster line; the first fuel storage tank and the second fuel storage tank are connected to the inlets of the first booster pump and the second booster pump via the booster line, and the outlets of the first booster pump and the second booster pump are connected to the first fuel storage tank and the second fuel storage tank via the fuel return line.

[0022] Optionally, the booster pipeline includes a first booster pipeline and a second booster pipeline; one end of the first booster pipeline is connected to the first fuel storage tank, and the other end of the first booster pipeline is connected to the inlet of the first booster pump and the second booster pump; one end of the second booster pipeline is connected to the second fuel storage tank, and the other end of the second booster pipeline is connected to the middle part of the first booster pipeline.

[0023] Optionally, a pressurization connecting pipe is provided between the first pressurization pipe and the second pressurization pipe, one end of the pressurization connecting pipe being connected to the first pressurization pipe and the other end of the pressurization connecting pipe being connected to the second pressurization pipe.

[0024] Optionally, the first pressurization pipeline is provided with a first pressurization valve and a second pressurization valve; the second pressurization pipeline is provided with a fourth pressurization valve and a fifth pressurization valve; one end of the pressurization connecting pipeline is located between the first pressurization valve and the second pressurization valve, and the other end of the pressurization connecting pipeline is located between the fourth pressurization valve and the fifth pressurization valve.

[0025] Optionally, a third pressure boosting valve is provided on the pressure boosting connecting pipeline.

[0026] Optionally, the fuel return line includes a first return line and a second return line; one end of the first return line is connected to the first fuel storage tank, and the other end of the first return line is connected to the inlet of the first return pump and the second return pump; one end of the second return line is connected to the second fuel storage tank, and the other end of the second return line is connected to the middle of the first return line.

[0027] Optionally, a return connection pipe is provided between the first return pipe and the second return pipe, one end of the return connection pipe being connected to the first return pipe and the other end of the return connection pipe being connected to the second return pipe.

[0028] Optionally, the first return pipeline is provided with a first return valve and a second return valve; the second return pipeline is provided with a fourth return valve and a fifth return valve; one end of the return connecting pipeline is located between the first return valve and the second return valve, and the other end of the return connecting pipeline is located between the fourth return valve and the fifth return valve.

[0029] Optionally, a third reflux valve is provided on the reflux connection pipeline.

[0030] This invention also discloses a process for a system based on the above-described flexible control of liquid delivery and reflux, comprising the following steps:

[0031] Step 1: When using fuel from the first fuel storage tank and returning it to this tank, open the first and second pressurization valves, and close the third, fourth, and fifth pressurization valves; for the fuel return line, open the first and second return valves, and close the third, fourth, and fifth return valves, or open the first, third, and fifth return valves, and close the second and fourth return valves.

[0032] Step 2: When using fuel from the first fuel storage tank and returning it to the second fuel storage tank, open the first and second pressurization valves, and close the third, fourth, and fifth pressurization valves; for the fuel return line, close the first, second, and third return valves and open the fourth and fifth return valves, or open the second, third, and fourth return valves and close the first and fifth return valves.

[0033] Step 3: When using fuel from the second fuel storage tank and returning it to this tank, open the second, third, and fourth pressurization valves on the fuel inlet line, and close the first and fifth pressurization valves; close the first, second, and third return valves on the fuel return line, and open the fourth and fifth return valves, or open the second, third, and fourth return valves on the fuel return line, and close the first and fifth return valves.

[0034] Step 4: When using fuel from the second fuel tank and returning it to the first fuel tank, open the second, third, and fourth pressurization valves on the fuel inlet line, and close the first and fifth pressurization valves; open the first and second return valves on the fuel return line, and close the third, fourth, and fifth return valves, or open the first, third, and fifth return valves on the fuel return line, and close the second and fourth return valves.

[0035] The present invention achieves the following technical effects compared to the prior art:

[0036] The system and process for flexibly controlling liquid delivery and reflux in this invention can flexibly control the fuel delivery and reflux process. By controlling the delivery of alcohol-based fuel, it achieves the goals of risk prevention, simplification, and temperature control, and can be switched at will to meet usage requirements. It can also reduce the configuration of fuel booster pumps and achieve redundant configuration, reducing the risk of modifying the operating equipment. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the system for flexibly controlling liquid delivery and reflux according to the present invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. First booster pump; 2. Second booster pump; 3. First fuel storage tank; 4. Second fuel storage tank;

[0041] Z1, First pressure boosting valve; Z2, Second pressure boosting valve; Z3, Third pressure boosting valve; Z4, Fourth pressure boosting valve; Z5, Fifth pressure boosting valve;

[0042] X1, First reflux valve; X2, Second reflux valve; X3, Third reflux valve; X4, Fourth reflux valve; X5, Fifth reflux valve;

[0043] N2, first interface; N6, second interface. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Example 1:

[0046] like Figure 1As shown, this embodiment provides a system and process for flexibly controlling liquid delivery and return, including a first booster pump 1, a second booster pump 2, a first fuel storage tank 3, a second fuel storage tank 4, a fuel return pipeline, and a booster pipeline; the first fuel storage tank 3 and the second fuel storage tank 4 are connected to the inlets of the first booster pump 1 and the second booster pump 2 through the booster pipeline, and the outlets of the first booster pump 1 and the second booster pump 2 are connected to the first fuel storage tank 3 and the second fuel storage tank 4 through the fuel return pipeline.

[0047] In this specific embodiment, the booster pipeline includes a first booster pipeline and a second booster pipeline; one end of the first booster pipeline is connected to the first fuel storage tank 3, and the other end of the first booster pipeline is connected to the inlet of the first booster pump 1 and the second booster pump 2; one end of the second booster pipeline is connected to the second fuel storage tank 4, and the other end of the second booster pipeline is connected to the middle of the first booster pipeline. A booster connecting pipeline is provided between the first booster pipeline and the second booster pipeline, with one end of the booster connecting pipeline connected to the first booster pipeline and the other end of the booster connecting pipeline connected to the second booster pipeline. A first booster valve Z1 and a second booster valve Z2 are provided on the first booster pipeline; a fourth booster valve Z4 and a fifth booster valve Z5 are provided on the second booster pipeline; one end of the booster connecting pipeline is located between the first booster valve Z1 and the second booster valve Z2, and the other end of the booster connecting pipeline is located between the fourth booster valve Z4 and the fifth booster valve Z5. A third pressure boosting valve Z3 is installed on the pressure boosting connection pipeline.

[0048] The fuel return pipeline includes a first return pipeline and a second return pipeline. One end of the first return pipeline is connected to the first fuel storage tank 3, and the other end is connected to the inlet of the first return pump and the second return pump. One end of the second return pipeline is connected to the second fuel storage tank 4, and the other end is connected to the middle of the first return pipeline. A return connecting pipeline is provided between the first and second return pipelines, with one end connected to the first return pipeline and the other end connected to the second return pipeline. A first return valve X1 and a second return valve X2 are provided on the first return pipeline; a fourth return valve X4 and a fifth return valve X5 are provided on the second return pipeline; one end of the return connecting pipeline is located between the first return valve X1 and the second return valve X2, and the other end is located between the fourth return valve X4 and the fifth return valve X5. A third return valve X3 is provided on the return connecting pipeline.

[0049] The first booster line and the second booster line are respectively connected to the first fuel storage tank 3 and the second fuel storage tank 4 through the first interface N2; the first return line and the second return line are respectively connected to the first fuel storage tank 3 and the second fuel storage tank 4 through the second interface N6.

[0050] Both the first booster pump 1 and the second booster pump 2 are booster shielded pumps.

[0051] Example 2:

[0052] This invention discloses a process for a system based on the flexible control of liquid delivery and reflux in Embodiment 1, comprising the following steps:

[0053] Step 1: When using fuel from the first fuel storage tank 3 and returning it to this tank, open the first pressurization valve Z1 and the second pressurization valve Z2, and close the third pressurization valve Z3, the fourth pressurization valve Z4, and the fifth pressurization valve Z5; for the fuel return line, open the first return valve X1 and the second return valve X2, and close the third return valve X3, the fourth return valve X4, and the fifth return valve X5, or open the first return valve X1, the third return valve X3, and the fifth return valve X5, and close the second return valve X2 and the fourth return valve X4.

[0054] Step 2: When using fuel from the first fuel storage tank 3 and returning it to the second fuel storage tank 4, open the first booster valve Z1 and the second booster valve Z2, and close the third booster valve Z3, the fourth booster valve Z4 and the fifth booster valve Z5; close the first return valve X1, the second return valve X2 and the third return valve X3 on the fuel return line, and open the fourth return valve X4 and the fifth return valve X5, or open the second return valve X2, the third return valve X3 and the fourth return valve X4 on the fuel return line, and close the first return valve X1 and the fifth return valve X5.

[0055] Step 3: When using fuel from the second fuel storage tank 4 and returning it to this tank, open the second pressurization valve Z2, the third pressurization valve Z3, and the fourth pressurization valve Z4 on the fuel inlet pipeline, and close the first pressurization valve Z1 and the fifth pressurization valve Z5; close the first return valve X1, the second return valve X2, and the third return valve X3 on the fuel return pipeline, and open the fourth return valve X4 and the fifth return valve X5, or open the second return valve X2, the third return valve X3, and the fourth return valve X4 on the fuel return pipeline, and close the first return valve X1 and the fifth return valve X5.

[0056] Step 4: When using fuel from the second fuel storage tank 4 and returning it to the first fuel storage tank 3, open the second pressurization valve Z2, the third pressurization valve Z3, and the fourth pressurization valve Z4 on the fuel inlet pipeline, and close the first pressurization valve Z1 and the fifth pressurization valve Z5; open the first return valve X1 and the second return valve X2 on the fuel return pipeline, and close the third return valve X3, the fourth return valve X4, and the fifth return valve X5, or open the first return valve X1, the third return valve X3, and the fifth return valve X5 on the fuel return pipeline, and close the second return valve X2 and the fourth return valve X4.

[0057] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0058] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A system for flexibly controlling liquid delivery and return, characterized in that, The system includes a first booster pump, a second booster pump, a first fuel storage tank, a second fuel storage tank, a fuel return line, and a booster line. The first fuel storage tank and the second fuel storage tank are connected to the inlets of the first booster pump and the second booster pump via the booster line, and the outlets of the first booster pump and the second booster pump are connected to the first fuel storage tank and the second fuel storage tank via the fuel return line. The booster line includes a first booster pipeline and a second booster pipeline. One end of the first booster pipeline is connected to the first fuel storage tank, and the other end of the first booster pipeline is connected to the... The inlets of the first booster pump and the second booster pump are connected; one end of the second booster pipeline is connected to the second fuel storage tank, and the other end of the second booster pipeline is connected to the middle of the first booster pipeline; a booster connecting pipeline is provided between the first booster pipeline and the second booster pipeline, one end of the booster connecting pipeline is connected to the first booster pipeline, and the other end of the booster connecting pipeline is connected to the second booster pipeline; a first booster valve and a second booster valve are provided on the first booster pipeline; a fourth booster valve and a fifth booster valve are provided on the second booster pipeline. The booster connection pipeline has one end located between the first booster valve and the second booster valve, and the other end located between the fourth booster valve and the fifth booster valve; the fuel return pipeline includes a first return pipeline and a second return pipeline; one end of the first return pipeline is connected to the first fuel storage tank, and the other end is connected to the inlet of the first booster pump and the second booster pump; one end of the second return pipeline is connected to the second fuel storage tank, and the other end is connected to the middle of the first return pipeline. A return flow connecting pipe is provided between the first return pipe and the second return pipe. One end of the return flow connecting pipe is connected to the first return pipe, and the other end of the return flow connecting pipe is connected to the second return pipe. A first return valve and a second return valve are provided on the first return pipe. A fourth return valve and a fifth return valve are provided on the second return pipe. One end of the return flow connecting pipe is located between the first return valve and the second return valve, and the other end of the return flow connecting pipe is located between the fourth return valve and the fifth return valve.

2. The system for flexibly controlling liquid delivery and return according to claim 1, characterized in that, A third pressure boosting valve is installed on the pressure boosting connection pipeline.

3. The system for flexibly controlling liquid delivery and return according to claim 1, characterized in that, A third reflux valve is installed on the reflux connection pipeline.

4. The process of the system for flexibly controlling liquid delivery and reflux according to any one of claims 1 to 3, characterized in that, Includes the following steps, Step 1: When using fuel from the first fuel storage tank and returning it to this tank, open the first and second pressurization valves, and close the third, fourth, and fifth pressurization valves; for the fuel return line, open the first and second return valves, and close the third, fourth, and fifth return valves, or open the first, third, and fifth return valves, and close the second and fourth return valves. Step 2: When using fuel from the first fuel storage tank and returning it to the second fuel storage tank, open the first and second pressurization valves, and close the third, fourth, and fifth pressurization valves; for the fuel return line, close the first, second, and third return valves and open the fourth and fifth return valves, or open the second, third, and fourth return valves and close the first and fifth return valves. Step 3: When using fuel from the second fuel storage tank and returning it to this tank, open the second, third, and fourth pressurization valves on the fuel inlet line, and close the first and fifth pressurization valves; close the first, second, and third return valves on the fuel return line, and open the fourth and fifth return valves, or open the second, third, and fourth return valves on the fuel return line, and close the first and fifth return valves. Step 4: When using fuel from the second fuel tank and returning it to the first fuel tank, open the second, third, and fourth pressurization valves on the fuel inlet line, and close the first and fifth pressurization valves; open the first and second return valves on the fuel return line, and close the third, fourth, and fifth return valves, or open the first, third, and fifth return valves on the fuel return line, and close the second and fourth return valves.

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