A waste heat recovery heating device for a well site power generation facility

Abstract

The utility model relates to power generation equipment waste heat recovery technical field, especially a kind of well site power generation equipment waste heat recovery heating device, including flue gas waste heat recovery unit, frequency conversion circulating pump, flue gas tee control valve, automatic exhaust valve, expansion water tank, heating terminal and comprehensive controller, utilize the waste heat energy of flue gas emission of well site power generation equipment, adjust the heat of flue gas waste heat recovery unit by flue gas tee control valve, ensure the heat use of heating system while not influence power generation equipment operation, both ensure the normal operation of power generation equipment, and realize waste heat heating, save heating fuel cost, reduce energy consumption while reduce the emission of heating fuel combustion pollutant. Through frequency conversion circulating pump, according to the pressure and temperature adjustment circulating pump speed of heating setting, automatic temperature control and economic operation, automatic exhaust valve can discharge system excess gas, need not regular air release etc. operation.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology for power generation equipment, and in particular to a waste heat recovery and heating device for well site power generation equipment. Background Technology

[0002] In oilfield drilling operations, especially in northern regions during winter, coal-fired or oil-fired boilers are essential for heating. These boilers also provide hot water and insulation for some equipment to ensure normal drilling conditions. Traditionally, coal-fired boilers were used, but due to environmental regulations, they have been largely replaced by oil-fired and gas-fired boilers. Some drilling teams even use electricity for heating. Meanwhile, generator sets are required for power during drilling operations, and the heat from the exhaust gases is often wasted. The use of oil-fired and gas-fired boilers increases drilling costs during winter, and the combustion of these gases also increases carbon dioxide emissions. Therefore, fully utilizing the waste heat from the generator sets used in drilling can save costs and reduce carbon dioxide emissions.

[0003] Currently, some drilling sites are utilizing the waste heat from generator sets, but the utilization model is relatively crude. It simply uses water pumps to circulate flue gas and heating terminals without controlling the emission of flue gas or the temperature and flow rate of circulating water. This results in unstable heating system temperatures that cannot be automatically adjusted, and there are also dangerous conditions such as the flue gas recovery device overheating and generating steam. Utility Model Content

[0004] The purpose of this invention is to provide a waste heat recovery and heating device for well site power generation equipment to solve the problems mentioned in the background art.

[0005] This utility model provides a waste heat recovery and heating device for well site power generation equipment, including:

[0006] A three-way flue gas control valve, which is connected to the flue gas system of the power generation equipment;

[0007] A flue gas waste heat recovery unit, which is connected to the flue gas three-way control valve;

[0008] A heating heat exchange circulating water circuit connects the flue gas waste heat recovery unit to the heating terminal; the heating circulating water circuit includes a variable frequency circulating pump on the pipeline and an expansion tank installed in front of the variable frequency circulating pump.

[0009] The integrated controller is connected to the flue gas three-way control valve, the flue gas waste heat recovery device, and the heating terminal control.

[0010] In a further improvement, the flue gas three-way control valve connects the flue gas system, the flue gas waste heat recovery unit, and the vent end, and is used to adjust the ratio between the flue gas discharged to the flue gas waste heat recovery unit and the vent end; the vent end is the port for discharging flue gas into the atmosphere.

[0011] In a further improvement, the ratio between the flue gas three-way control valve and the flue gas waste heat recovery unit and the vent end is controlled by the integrated controller based on the heat demand of the heating terminal and the temperature of the circulating medium.

[0012] As a further improvement, the variable frequency circulating pump has two units, which can be used alternately or one can be kept as a backup.

[0013] In a further improvement, the expansion tank is connected to the water supply system to supply water to the heating heat exchange circulation water circuit to maintain water pressure.

[0014] In a further improvement, the heating heat exchange circulation water circuit is equipped with an automatic vent valve after the heating terminal; the automatic vent valve is located at the highest point of the system and is also equipped with a bypass branch pipe connected to the exhaust valve at the top of the flue gas waste heat recovery unit.

[0015] Further improvements include the integrated controller collecting data on the outlet water temperature and pressure of the flue gas waste heat recovery unit, the return water temperature and pressure of the heating system, the ambient temperature, the room temperature of the heating terminal, the speed of the variable frequency circulating pump, the opening degree of the flue gas three-way control valve, the operating status of the power generation equipment, the temperature of the flue gas exhaust fan, and the water level of the expansion tank. It controls the opening degree of the flue gas three-way control valve and the opening sequence and speed of the variable frequency circulating pump through manually set preset values, and provides alarm prompts for faults and operational risks.

[0016] The beneficial effects of this utility model are as follows:

[0017] (1) The waste heat recovery heating device for well site power generation equipment provided by this utility model adopts multiple sub-technologies and organically combines each sub-technologies into a set of waste heat recovery variable frequency heating system for well site power generation equipment, including equipment and automated management software, which effectively solves the problems related to the original simple system of simply using water pumps to circulate flue gas and heating terminals for heating.

[0018] (2) The variable frequency circulating pump adjusts the speed of the circulating pump according to the pressure and temperature set for heating, so as to achieve automatic temperature control and economical operation. The automatic air vent valve can discharge excess gas in the system, so that the heating terminal equipment does not need to perform operations such as periodic air release. The ground water replenishment system ensures continuous replenishment of circulating water.

[0019] (3) The improved automatic vent valve of the waste heat recovery heating device has a dual function. It is located at the highest point of the circulation system and is connected to the exhaust valve at the top of the flue gas waste heat recovery unit via a bypass branch pipe. On the one hand, it vents the water vapor in the heating circulation system to prevent local non-circulation at the heating terminal. On the other hand, it vents the gas at the top of the flue gas waste heat recovery unit to prevent dry burning of the flue gas waste heat recovery unit from damaging the equipment or causing safety hazards. Attached Figure Description

[0020] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute a limitation thereof. It should also be understood that these drawings are shown for simplicity and clarity and are not necessarily drawn to scale.

[0021] Figure 1 This is a schematic diagram showing the overall components and connections of the waste heat recovery and heating device for the well site power generation equipment.

[0022] The components include: 1. Flue gas three-way control valve; 2. Flue gas waste heat recovery unit; 3. Expansion tank; 4. Variable frequency circulating pump; 5. Automatic exhaust valve; 6. Heating terminal; 7. Integrated controller. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0024] Please see the appendix Figure 1 This embodiment provides a variable frequency heating system for waste heat recovery from well site power generation equipment, including a flue gas three-way control valve 1, a flue gas waste heat recovery device 2, an expansion tank 3, a variable frequency circulating pump 4, an automatic exhaust valve 5, a heating terminal 6, and a comprehensive controller 7.

[0025] The flue gas waste heat recovery unit 2 is installed on top of the generator set and connected to the generator set via a three-way flue gas control valve 1. It is a split-type installation, allowing for easy disassembly during transportation or when not in use during the summer. The flue gas waste heat recovery unit 1 includes inlet and outlet ports, with the inlet located at the top and the outlet at the bottom. The unit is insulated to improve the efficiency of flue gas waste heat utilization and prevent burns to on-site personnel. The flue gas waste heat recovery unit 1, the variable frequency circulating pump 4, and the heating terminal 6 form a closed-loop circulation system. The system is dynamically replenished with water through an expansion tank 5 to maintain water pressure balance. The expansion tank 4 is connected to the well site's water supply system, and water can be replenished automatically via a water supply valve when the tank is low.

[0026] The working principle of this utility model is as follows:

[0027] This variable frequency heating system employs multiple sub-technologies and organically combines them into a comprehensive system.

[0028] After the generator set's flue gas is discharged, it is diverted through a three-way flue gas control valve. This valve can control whether all or part of the flue gas passes through the flue gas waste heat recovery unit, or it can completely vent the gas when not in use. The opening of the three-way flue gas control valve is automatic, controlled by signals from the integrated controller. It is primarily based on the heating demand of the heating terminal and the temperature of the circulating medium; when the heating demand increases, the flue gas venting is reduced.

[0029] The variable frequency circulating pump is the core component of the system, controlled by a comprehensive controller. Its speed is adjusted based on the heating return water temperature using a PID algorithm, maintaining a relatively stable temperature range at the heating terminals. Two variable frequency circulating pumps operate alternately and can also serve as backups for each other; one pump is sufficient to meet the heating needs. The system features low-temperature protection. If the return water temperature drops below 10℃ (this can be dynamically set), the system will maintain a minimum circulation rate regardless of the outlet water temperature or the heating demand of the area, thus preventing system freeze.

[0030] The expansion tank can dynamically replenish water and maintain pressure in the system, ensuring stable system pressure. It also has an automatic water replenishment function, utilizing the drilling team's water supply system. An alarm signal will be issued if the water level is insufficient. If automatic water replenishment fails even after reaching the minimum safe water level, the integrated controller will vent the flue gas three-way control valve and reduce the variable frequency pump's operating speed until it stops.

[0031] The automatic vent valve has a dual function. It is located at the highest point of the circulation system and is connected to the vent valve at the top of the flue gas waste heat recovery unit via a bypass branch pipe. On the one hand, it vents the water vapor from the heating circulation system to prevent localized non-circulation at the heating terminals. On the other hand, it vents the gas at the top of the flue gas waste heat recovery unit to prevent dry burning, which could damage the equipment or create safety hazards.

[0032] The integrated controller serves as the central brain of the entire system. It collects parameters such as the outlet water temperature and pressure of the flue gas waste heat recovery unit, the return water temperature and pressure of the heating system, the ambient temperature, the room temperature of the heating terminals, the speed of the variable frequency circulating pump, the opening degree of the flue gas three-way control valve, the operating status of the power generation equipment, the temperature of the flue gas exhaust fan, and the water level of the expansion tank. It controls the opening degree of the flue gas three-way control valve and the opening sequence and speed of the variable frequency circulating pump based on manually set preset values, and provides alarm prompts for faults and operational risks. The integrated controller also enables remote viewing and control functions.

[0033] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A waste heat recovery and heating device for well site power generation equipment, characterized in that, include: A three-way flue gas control valve, which is connected to the flue gas system of the power generation equipment; A flue gas waste heat recovery unit, which is connected to the flue gas three-way control valve; The heating heat exchange circulating water circuit connects the flue gas waste heat recovery unit to the heating terminal. The heating heat exchange circulating water circuit includes a variable frequency circulating pump on the pipeline and an expansion tank installed in front of the variable frequency circulating pump. The integrated controller is connected to the flue gas three-way control valve, the flue gas waste heat recovery device, and the heating terminal control.

2. The waste heat recovery and heating device for well site power generation equipment as described in claim 1, characterized in that, The flue gas three-way control valve connects the flue gas system, the flue gas waste heat recovery unit, and the vent end, and is used to adjust the ratio between the flue gas discharged to the flue gas waste heat recovery unit and the vent end; the vent end is the port for discharging flue gas into the atmosphere.

3. The waste heat recovery and heating device for well site power generation equipment as described in claim 2, characterized in that, The ratio between the flue gas three-way control valve and the flue gas waste heat recovery unit and the vent end is controlled by the integrated controller based on the heat demand of the heating terminal and the temperature of the circulating medium.

4. The waste heat recovery and heating device for well site power generation equipment as described in claim 1, characterized in that, The variable frequency circulating pump has two units, which can be used alternately or one can be kept as a backup.

5. A waste heat recovery and heating device for well site power generation equipment as described in claim 1, characterized in that, The expansion tank is connected to the water supply system and is used to supply water to the heating heat exchange circulation water circuit to maintain water pressure.

6. The waste heat recovery and heating device for well site power generation equipment as described in claim 1, characterized in that, The heating heat exchange circulation water circuit is equipped with an automatic vent valve after the heating terminal; the automatic vent valve is located at the highest point of the system and is also equipped with a bypass branch pipe connected to the exhaust valve at the top of the flue gas waste heat recovery unit.

7. A waste heat recovery and heating device for well site power generation equipment as described in claim 1, characterized in that, The integrated controller collects the outlet water temperature and pressure of the flue gas waste heat recovery unit, the return water temperature and pressure of the heating system, the ambient temperature, the room temperature of the heating terminal, the speed of the variable frequency circulating pump, the opening degree of the flue gas three-way control valve, the operating status of the power generation equipment, the temperature of the flue gas exhaust fan, and the water level of the expansion tank. It controls the opening degree of the flue gas three-way control valve, the opening sequence and speed of the variable frequency circulating pump through preset values ​​set manually, and provides alarm prompts for faults and operational risks.

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