CN112265628B - Crude oil transport tugboat fleet waste heat comprehensive utilization system - Google Patents

Abstract

The invention discloses a crude oil transportation tug fleet waste heat comprehensive utilization system which comprises a tug main engine cylinder sleeve circulating water heat recovery subsystem, a tug main engine smoke heat recovery subsystem and a barge crude oil heating and recovery device, wherein the tug main engine cylinder sleeve circulating water heat recovery subsystem and the tug main engine smoke heat recovery subsystem are arranged on a crude oil transportation tug, and the crude oil heating and recovery components are respectively arranged on a barge. The tug host cylinder sleeve circulating water heat recovery subsystem comprises a constant temperature valve, a heat exchanger and a circulating pump group, the tug host smoke heat recovery subsystem comprises an electric three-way valve, a hot water boiler, a booster pump group and a compressed air pressure accumulation tank, and the barge crude oil heating and recovery device comprises a hot water storage tank, an array heating coil pipe, a plurality of temperature control valves and a water return tank. The invention has compact structure and convenient installation and maintenance. The barge does not need to be additionally provided with a fuel oil boiler to consume fuel to heat crude oil, so that the energy saving and consumption reduction effects are very remarkable.

Description

Crude oil transport tugboat fleet waste heat comprehensive utilization system

Technical Field

The invention relates to an energy-saving system for a crude oil transport tugboat fleet, and in particular to an energy-saving system which utilizes waste heat of flue gas discharged from a tugboat to heat crude oil loaded in a barge, and belongs to the technical field of energy saving.

Background technique

Crude oil transportation mainly relies on large tankers, but due to their deep draft and large size, they are generally unable to sail on the Yangtze River and inland rivers. However, most refineries are not located on the seashore, so large tankers cannot reach them directly. Most of them rely on barges of tugboat fleets to complete the final docking transportation. Because barges are unpowered ships without heat sources, and crude oil from most production areas has a high viscosity and cannot flow and transport at room temperature, steam heating must be used at the dock before unloading to increase the temperature of the crude oil and reduce its viscosity to a critical value that is convenient for it to flow before unloading. Taking the commonly used 5,000-ton barge as an example, if the initial temperature of the crude oil in the cabin is consistent with the river (river) water temperature of 15°C, it takes at least 12 hours for the crude oil heated to 45°C to reach the critical value of flow. This means that the barge needs to occupy the dock for an additional 12 hours, which reduces the utilization rate of the barge, and the terminal energy fee must be paid at least 25,000 yuan. In order to improve the unloading efficiency of crude oil, a fuel boiler can be configured on the barge, and the fuel boiler is used to produce steam to heat and keep the crude oil warm during transportation. The above two methods both increase the transportation cost of the crude oil transport tugboat fleet and seriously affect the economic benefits of the crude oil transport tugboat fleet.

Summary of the invention

The purpose of the present invention is to provide a crude oil transport tugboat fleet waste heat comprehensive utilization system, which can heat the crude oil on each barge without additional fuel consumption, thereby reducing the transportation cost of the crude oil transport tugboat fleet.

The present invention is achieved through the following technical solutions:

A crude oil transport tugboat fleet waste heat comprehensive utilization system, comprising a tugboat main engine cylinder liner circulating water heat recovery subsystem, a tugboat main engine flue gas heat recovery subsystem and a barge crude oil heating and recovery device, wherein the tugboat main engine cylinder liner circulating water heat recovery subsystem and the tugboat main engine flue gas heat recovery subsystem are arranged on the crude oil transport tugboat, and the crude oil heating and recovery components are respectively arranged on the barge;

The tugboat main engine cylinder jacket circulating water heat recovery subsystem comprises a thermostatic valve, a heat exchanger and a circulating pump group, the tugboat main engine cylinder jacket cooling water outlet pipe is connected to the first end of the thermostatic valve, the second end of the thermostatic valve is connected to the tugboat main engine cylinder jacket cooling water inlet pipe and the heat exchanger high temperature medium output end through pipelines, and the third end of the thermostatic valve is connected to the heat exchanger high temperature medium input end;

The tugboat main engine flue gas heat recovery subsystem comprises an electric three-way valve, a hot water boiler, a booster pump group and a compressed air accumulator tank, wherein the compressed air accumulator tank is connected to the hot water boiler through a pipeline and a accumulator tank stop valve, the tugboat main engine exhaust pipe is connected to the lower part of the hot water boiler through the bypass end of the electric three-way valve, the flue gas branch pipe on one side of the upper part of the hot water boiler is connected to the upper end of the exhaust pipe, the hot water output pipeline on the top of the hot water boiler is connected to the input end of the barge crude oil heating and recovery device on each barge through the hot water boiler output stop valve, the booster pump group, the water outlet quick connection assembly and the connecting hose in turn; the pipeline of the return water quick connection assembly is connected to the return water end of the hot water boiler through the circulating pump group, the low-temperature medium input end of the heat exchanger, the low-temperature medium output end of the heat exchanger and the return water stop valve in turn;

The barge crude oil heating and recovery device includes a hot water storage tank, an array of heating coils, several temperature control valves and a return water tank. The hot water storage tank arranged at one end of the barge is connected to one end of the heating coil in the bottom of the independent oil storage tank through a first stop valve, and the other end of the heating coil is connected to the return water tank arranged at the other end of the barge through a temperature control valve and a second stop valve in sequence. The output end of the return water tank is connected to the hot water return end of the hot water boiler through a connecting hose, a return water quick link assembly, a circulating pump group, a heat exchanger low-temperature medium input end, a heat exchanger low-temperature medium output end, and a stop valve in sequence.

The purpose of the present invention can be further achieved by the following technical measures.

Furthermore, the circulation pump group and the booster pump group have the same structure, and each includes two centrifugal impeller pumps, one for use and one for backup. The flow rates of the circulation pump group and the booster pump group are both 20,000 l/h, and the outlet pressure p1 of the circulation pump group is ≤0.5 Mpa. The outlet pressure p2 of the booster pump group is ≤0.3 Mpa. The volume V of the hot water storage tank is ≥2 m ³ .

Furthermore, the thermostatic valve is a LHF-80 thermostatic valve.

Furthermore, the structures of the water outlet quick-link assembly and the water return quick-link assembly are the same, respectively including an intermediate pipe and a conical joint sealed and fixedly connected to both ends of the intermediate pipe, the intermediate pipe is fixed side by side on one end of the tugboat and adjacent to the corresponding barge; the water outlet quick-link assembly is connected to the booster pump group through a pipeline, and the water return quick-link assembly is connected to the circulation pump group through a pipeline; the other end of the water outlet quick-link assembly is connected to the hot water storage tank of each barge through a connecting hose and corresponding pipelines, and the other end of the return water quick-link assembly is connected to the return water tank of each barge through a connecting hose and corresponding pipelines.

Furthermore, the temperature control valve is a wax melting type temperature control valve.

Furthermore, the heating coil is a serpentine tube that is continuously bent in an S shape, and the relationship between the length L of the straight portion of the S shape and the inner diameter D of the bend and the diameter d of the coil is: D=10d=1/4L.

The heat recovery subsystem for cylinder jacket circulating water of the tugboat main engine and the heat recovery subsystem for flue gas of the tugboat main engine of the present invention extract the waste heat of the cylinder jacket circulating cooling water of the tugboat main engine and the waste heat of the flue gas discharged from the exhaust pipe through a hot water boiler and a heat exchanger, and transport them to the heating coil of the crude oil heating and recovery device of the barge, so as to heat the crude oil with high viscosity loaded on the barge, so as to improve the fluidity of the crude oil and facilitate the unloading of the crude oil. The structure is compact and easy to install and maintain. The barge does not need to add an oil boiler to consume fuel to heat the crude oil, and the energy-saving and consumption-reducing effect is very significant.

Advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments thereof, which are given by way of example only with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a crude oil transport tugboat fleet according to an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of the present invention;

FIG3 is a schematic diagram of a heating coil according to the present invention;

FIG. 4 is a simplified structural diagram of the water outlet and return quick connection assembly of the present invention.

Detailed ways

The present invention is further described below in conjunction with the accompanying drawings and embodiments for the Yangtze River 62031 tugboat and the subsection oil 63051 barge. As shown in FIG1 , the crude oil transport tugboat fleet of this embodiment is a one-pushing-four type, with four barges 200 fixed in a field shape by cables, and the crude oil transport tugboat 100 is located on the right side of one of the barges 200 for pushing operations.

As shown in FIG2 , this embodiment includes a tugboat main engine cylinder jacket circulating water heat recovery subsystem 1, a tugboat main engine flue gas heat recovery subsystem 2, and crude oil heating and recovery devices 3 respectively arranged on barges. The tugboat main engine cylinder jacket circulating water heat recovery subsystem 1 and the tugboat main engine flue gas heat recovery subsystem 2 are arranged on a crude oil transport tugboat 100, and the crude oil heating and recovery components 3 are respectively arranged on a barge 200. In FIG2 , the solid arrows indicate the flow direction of the medium, and the hollow arrows indicate the flow direction of the flue gas.

The tugboat main engine cylinder jacket circulating water heat recovery subsystem 1 comprises a thermostatic valve 11, a heat exchanger 12 and a circulating pump group 13. The tugboat main engine cylinder jacket cooling water outlet pipe 14 is connected to the first end 111 of the thermostatic valve, the second end 112 of the thermostatic valve is respectively connected to the tugboat main engine cylinder jacket cooling water inlet pipe 15 and the heat exchanger low temperature medium output end 122, and the third end 113 of the thermostatic valve is connected to the heat exchanger high temperature medium input end 121. The thermostatic valve 11 of this embodiment is a LHF-80 type thermostatic valve.

The tugboat main engine flue gas heat recovery subsystem 2 includes an electric three-way valve 21, a hot water boiler 22, a booster pump group 23 and a compressed air accumulator 24. The compressed air accumulator 24 is connected to the hot water boiler 22 through a pipeline. The tugboat main engine exhaust pipe 20 is connected to the lower part of the hot water boiler 22 through the bypass end 211 of the electric three-way valve 21. The flue gas branch pipe 201 on one side of the upper part of the hot water boiler 22 is connected to the upper end of the exhaust pipe 20. The hot water output pipeline 221 on the top of the hot water boiler 22 is connected to the input end of the barge crude oil heating and recovery device 3 on each barge 200 through the hot water boiler output stop valve 25, the booster pump group 23, the water outlet quick connection assembly 26 and the connecting hose 27. The pipeline of the return water quick connection assembly 28 is connected to the return water end 222 of the hot water boiler through the circulation pump group 13, the heat exchanger low temperature medium input end 123, the heat exchanger low temperature medium output end 124, and the return water stop valve 29.

The circulating pump group 13 and the compressed air accumulator tank 24 store the pressure in the hot water boiler 22 at a level of more than 0.2 MPa, so that the heated water in the hot water boiler 22 will not vaporize at 100°C. The booster pump group 23 provides an additional pressure head so that the heated water can overcome the resistance along the pipeline and maintain a certain turbulent flow in the pipeline, thereby achieving a higher heat exchange efficiency.

The electric three-way valve 21 distributes the flow of the flue gas discharged by the tugboat main engine 10, with one part entering the hot water boiler 22 and the other part being directly bypassed. When the temperature sensor detects that the outlet water temperature of the hot water boiler 22 reaches 98°C, the PLC controller instructs the electric three-way valve 21 to reduce its opening, thereby reducing the amount of exhaust gas entering the hot water boiler 22; when the outlet water temperature of the hot water boiler 22 is lower than 92°C, the PLC controller instructs the electric three-way valve 21 to increase its opening, thereby increasing the amount of flue gas entering the hot water boiler 22, thereby meeting the needs of the present invention for utilizing the waste heat of the flue gas discharged by the tugboat main engine 10. The electric three-way valve 21 of this embodiment uses an electric three-way butterfly valve with a diameter of DN450.

When the tugboat main engine 10 is in a relatively low cold load state shortly after startup, the outlet temperature of its cylinder jacket cooling water is lower than 80°C. At this time, the thermostatic valve 11 is closed, and the first end 111 of the thermostatic valve is connected to the second end 112 of the thermostatic valve. The cylinder jacket cooling water of the tugboat main engine directly enters the second end 112 of the thermostatic valve from the first end 111 of the thermostatic valve, and then returns to the cylinder jacket cooling water inlet pipe 15 of the tugboat main engine. When the tugboat main engine enters a normal working state and the load is relatively high

When the outlet temperature of the cooling water of the cylinder jacket of the tugboat main engine is greater than 80°C, the thermostatic valve 11 is opened, the first end 111 of the thermostatic valve is connected to the third end 113 of the thermostatic valve, and the cooling water of the tugboat main engine enters the heat exchanger 12 to preheat the boiler return water, and then returns to the cooling water inlet pipe 15 of the cylinder jacket of the tugboat main engine after preheating.

The barge crude oil heating and recovery device 3 includes a hot water storage tank 31, four groups of heating coils 32, four temperature control valves 33 and a return water tank 34. The hot water storage tank 31 arranged at one end of the barge 200 is connected to one end of the heating coils 32 in the bottom of the independent oil storage tank through the first stop valve 35, and the other end of the heating coils 32 is connected to the return water tank 34 arranged at the other end of the barge 10 through the temperature control valve 33 and the second stop valve 36 in sequence. The output end of the return water tank 34 is connected to the hot water return end 222 of the hot water boiler through the connecting hose 27, the return water quick link assembly 28, the circulating pump group 13, the heat exchanger low temperature medium input end 123, the heat exchanger low temperature medium output end 124, and the stop valve 29 in sequence. The temperature control valve 33 is a wax melting type temperature control valve. When the temperature of the hot water passing through the thermostatic valve 33 is reduced to below 80°C, the valve core of the paraffin condensation temperature control valve 33 is fully opened, and the hot water flow is increased to increase the heat conduction temperature of the heating coil 32. When the temperature of the hot water passing through the thermostatic valve 33 is higher than 90° C., the paraffin melts and the thermostatic valve 33 slowly reduces the opening of the valve core as the temperature rises, thereby reducing the flow of heated hot water and preventing the temperature of the independent oil storage tank from being too high.

As shown in FIG3 , the heating coil 32 is a serpentine tube that is continuously bent in an S shape and is made of a copper tube or a seamless steel tube. The relationship between the length L of the straight portion of the S shape and the inner diameter D of the bend and the diameter d of the coil is: D=10d=1/4L. The serpentine tube can increase the heat dissipation area to achieve the best heat conduction effect.

The circulation pump group 13 and the booster pump group 23 have the same structure, and each includes two centrifugal impeller pumps 131, one for use and one for backup, to improve the reliability of the present invention. The flow rates of the circulation pump group 13 and the booster pump group 23 are both 20000 l/h, and the outlet pressure p1 of the circulation pump group is ≤ 0.5 Mpa. The outlet pressure p2 of the booster pump group is ≤ 0.3 Mpa. The volume V of the hot water storage tank is ≥ 2 m ³ .

As shown in FIG4 , the structures of the outlet quick link assembly 26 and the return water quick link assembly 28 are the same, respectively including an intermediate pipe 261 and a conical joint 262 sealed and fixedly connected to both ends of the intermediate pipe 261, and the intermediate pipe 261 is fixed side by side on one end of the tugboat and is adjacent to the corresponding barge 200. The conical joint 262 can be quickly connected or quickly separated, and has a good sealing effect. The outlet quick link assembly 26 is connected to the booster pump group 23 through a pipeline, and the return water quick link assembly 28 is connected to the circulation pump group 13 through a pipeline; the other end of the outlet quick link assembly 26 is connected to the hot water storage tank 31 of each barge 200 through a connecting hose 27 and a corresponding pipeline, and the other end of the return water quick link assembly 28 is connected to the return water tank 34 of each barge through a connecting hose 27 and a corresponding pipeline.

In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims (4)

1. The crude oil transportation tug fleet waste heat comprehensive utilization system is characterized by comprising a tug main engine cylinder sleeve circulating water heat recovery subsystem, a tug main engine smoke heat recovery subsystem and a barge crude oil heating and recovery device, wherein the tug main engine cylinder sleeve circulating water heat recovery subsystem and the tug main engine smoke heat recovery subsystem are arranged on a crude oil transportation tug, and the crude oil heating and recovery components are respectively arranged on a barge;

The system comprises a tug main engine cylinder sleeve circulating water heat recovery subsystem, a heat exchanger and a circulating pump group, wherein a tug main engine cylinder sleeve cooling water outlet pipe is connected with a first end of the thermostatic valve, a second end of the thermostatic valve is respectively connected with a tug main engine cylinder sleeve cooling water inlet pipe and a heat exchanger high-temperature medium output end through pipelines, and a third end of the thermostatic valve is connected with a heat exchanger high-temperature medium input end;

the tug host machine flue gas heat recovery subsystem comprises an electric three-way valve, a hot water boiler, a booster pump set and a compressed air pressure accumulation tank, wherein the compressed air pressure accumulation tank is connected with the hot water boiler through a pipeline and a pressure accumulation tank stop valve, a tug host machine flue gas discharge pipe is connected with the lower part of the hot water boiler through a bypass end of the electric three-way valve, a flue gas branch pipe at one side of the upper part of the hot water boiler is communicated with the upper end of the flue gas discharge pipe, and a hot water output pipeline at the top of the hot water boiler is respectively connected with the input end of a barge crude oil heating and recovery device on each barge through the hot water boiler output stop valve, the booster pump set, a water outlet quick link assembly and a connecting hose in sequence; the pipeline of the backwater quick link assembly is connected with the backwater end of the hot water boiler sequentially through the circulating pump group, the low-temperature medium input end of the heat exchanger, the low-temperature medium output end of the heat exchanger and the backwater stop valve;

The barge crude oil heating and recycling device comprises a hot water storage tank, a plurality of heating coils, a plurality of temperature control valves and a backwater tank, wherein the hot water storage tank arranged at one end of the barge is respectively connected with one end of the heating coils in the bottom of the independent oil storage cabin through a first stop valve, the other end of the heating coils is sequentially connected with the backwater tank arranged at the other end of the barge through a temperature control valve and a second stop valve, and the output end of the backwater tank is sequentially connected with the hot water backwater end of a hot water boiler through a connecting hose, a backwater quick link assembly, a circulating pump group, a low-temperature medium input end of a heat exchanger, a low-temperature medium output end of the heat exchanger and a stop valve;

the circulating pump set and the booster pump set have the same structure and respectively comprise two centrifugal impeller pumps, wherein the flow rates of the circulating pump set and the booster pump set are respectively as follows: 20000l/h, the outlet pressure p1 of the circulating pump set is less than or equal to 0.5Mpa; the outlet pressure p2 of the booster pump group is less than or equal to 0.3Mpa;

The water outlet quick link assembly and the water return quick link assembly have the same structure and respectively comprise a middle pipe and conical joints fixedly connected with two ends of the middle pipe in a sealing way, wherein the middle pipe is fixed on one end of the tug side by side and is adjacent to the corresponding barge; the water outlet quick link assembly is connected with the booster pump set through a pipeline, and the water return quick link assembly is connected with the circulating pump set through a pipeline; the other end of the water outlet quick link assembly is respectively connected with the hot water storage tanks of the barges through connecting hoses and corresponding pipelines, and the other end of the water return quick link assembly is respectively connected with the water return tanks of the barges through connecting hoses and corresponding pipelines;

The heating coil is a coiled pipe which is continuously bent in an S shape, and the relation between the length L of the straight line part of the S shape, the bending inner diameter D and the coil pipe diameter D is as follows: d=10d=1/4L.

2. The crude oil transportation tug fleet waste heat comprehensive utilization system according to claim 1, wherein the volume V of the hot water storage tank is more than or equal to 2m ³.

3. The crude oil transport tug fleet waste heat comprehensive utilization system according to claim 1, wherein the thermostatic valve is an LHF-80 thermostatic valve.

4. The crude oil transport tug fleet waste heat comprehensive utilization system according to claim 1, wherein the temperature control valve is a wax melting type temperature control valve.