Method for on-line test of fuel oil

Abstract

The invention belongs to the technical field of oil refining and chemical engineering, and particularly relates to a fuel oil on-line test method, which comprises the following steps of: a) unloading test fuel oil, pressurizing the test fuel oil by a fuel oil unloading pump, and conveying the test fuel oil to a test fuel oil tank through a conveying pipeline; b) the test fuel oil in the test fuel oil tank flows out from the bottom of the tank and is conveyed to a test fuel oil heater through a test fuel oil pump; c) after being heated by the test fuel oil heater, the test fuel oil enters a fuel oil line of the catalyst regenerator, is atomized by a fuel oil nozzle and then enters a spent catalyst well of the catalyst regenerator or a regenerator pot bottom; d) burning and regenerating the to-be-regenerated catalyst by burning test fuel oil atomized steam entering the catalyst regenerator; and e) after the burning regeneration is carried out for a period of time, sampling and analyzing the catalyst in the catalyst regenerator, and judging whether the test fuel oil meets the use requirements of the catalyst regenerator or not according to the analysis result.

Description

Technical Field

[0001] The invention belongs to the technical field of oil refining and chemical engineering, and in particular relates to a method for online testing of fuel oil. Background Art

[0002] Double-riser fluidized bed catalytic cracking is a relatively advanced catalytic cracking technology. This technology can use gasoline components rich in alkanes and gasoline components rich in olefins as raw materials, and produce polymerization-grade propylene, propane, benzene, toluene, xylene and other chemical products under the action of high-performance molecular sieve catalysts.

[0003] After the molecular sieve catalyst reacts in the riser reactor, it becomes a regenerated catalyst. The regenerated catalyst passes through the settler, regenerated riser and other process links and enters the regenerator for regeneration. Since the light feed fed into the device has a low carbon content and cannot produce enough coke to maintain thermal balance, it is necessary to continuously add external combustion oil to burn off carbon deposits on the catalyst, and at the same time provide heat to the entire reaction system to maintain the thermal balance of the system.

[0004] The supplementary fuel oil enters the regenerator through the catalyst sleeve and the fuel oil pipe in the regenerator catalyst bed heater. Before being injected into the catalyst sleeve, the superheated low-pressure steam splits the fuel oil, and the split fuel oil is evaporated when it contacts the catalyst, but it does not burn. The evaporated fuel oil / steam mixture and the catalyst to be regenerated flow to the top of the catalyst sleeve, and then horizontally discharged into the regenerator catalyst bed, where it is burned and heats the catalyst in the regenerator.

[0005] The main energy consumed by the double-riser fluidized bed catalytic cracking unit is fuel oil, so obtaining relatively high-quality and low-cost fuel oil is the key to effectively reducing the operating costs of the unit. Summary of the invention

[0006] In view of this, an object of the present invention is to provide a method for online testing of fuel oil, which can efficiently, flexibly and economically perform online test evaluation on fuel oils with different characteristics, thereby quickly screening out fuel oils with lower costs.

[0007] The present invention provides a method for online testing of fuel oil, comprising the following process:

[0008] a) After the test fuel oil is unloaded, it is pressurized by the fuel oil unloading pump and sent to the test fuel oil tank through the delivery pipeline;

[0009] b) the test fuel oil in the test fuel oil tank flows out from the bottom of the tank and is transported to the test fuel oil heater through the test fuel oil pump, and the heat source of the test fuel oil heater is quench oil or steam;

[0010] c) After the test fuel oil is heated by the test fuel oil heater, it enters the first fuel oil line of the catalyst regenerator, and after being atomized by the first fuel oil nozzle, it enters the catalyst well to be regenerated in the catalyst regenerator;

[0011] Alternatively, the test fuel oil is heated by the test fuel oil heater and then enters the second fuel oil line of the catalyst regenerator, and then enters the catalyst well to be regenerated or the bottom of the regenerator pot of the catalyst regenerator after being atomized by the second fuel oil nozzle;

[0012] d) burning the atomized steam of the test fuel oil entering the catalyst regenerator to regenerate the spent catalyst and provide reaction heat for the catalytic cracking reaction;

[0013] e) After the charring regeneration is performed for a period of time, the catalyst in the catalyst regenerator is sampled and analyzed, and it is determined based on the analysis results whether the test fuel oil meets the use requirements of the catalyst regenerator.

[0014] Preferably, in step a), the working pressure of the delivery pipeline is 0.6-1.0 MPa, and the working flow rate is 10-20 t / h.

[0015] Preferably, in step a), the operating temperature of the test fuel oil tank is 115-125° C., and the operating pressure is 0.1-0.15 MPa.

[0016] Preferably, in step b), the test fuel oil heater comprises a heater A and a heater B designed in parallel, the heat source of heater A is quench oil, and the heat source of heater B is steam.

[0017] Preferably, in step b), the cold flow inlet temperature of the heater A is 115-125°C, the cold flow outlet temperature is 150-185°C, and the hot flow inlet temperature is 275-285°C.

[0018] Preferably, in step b), the cold flow inlet temperature of the heater B is 115-125° C., the cold flow outlet temperature is 150-185° C., and the saturated vapor pressure of the hot flow inlet is 1.6-2.0 MPa.

[0019] Preferably, in step c), the pressure of the test fuel oil atomized steam obtained after atomization by the first fuel oil nozzle or the second fuel oil nozzle is 0.6-1.0 MPa, and the flow rate is 30-60 kg / h.

[0020] Preferably, step e) is specifically as follows: after the charring regeneration is performed for a period of time, the catalyst in the catalyst regenerator is sampled and the metal element content in the sample is analyzed. If the metal element content in the sample is lower than a set value, it is determined that the test fuel oil meets the use requirements of the catalyst regenerator.

[0021] Preferably, in step e), the metal element includes one or more of Ni, Fe, V, Ca, Na, As and Mg.

[0022] Preferably, in step e), if the contents of Ni, Fe, V, Ca, Na, As and Mg in the sample are all lower than 500 mg / kg, it is determined that the test fuel oil meets the use requirements of the catalyst regenerator.

[0023] Compared with the prior art, the present invention provides a method for online testing of fuel oil, including the following processes: a) after the test fuel oil is unloaded, it is pressurized by a fuel oil unloading pump and then sent to a test fuel oil tank through a delivery pipeline; b) the test fuel oil in the test fuel oil tank flows out from the bottom of the tank and is delivered to a test fuel oil heater through a test fuel oil pump, and the heat source of the test fuel oil heater is quenching oil or steam; c) after the test fuel oil is heated by the test fuel oil heater, it enters the first fuel oil line of the catalyst regenerator, and is atomized by the first fuel oil nozzle and then enters the catalyst to be regenerated of the catalyst regenerator. well; or, after the test fuel oil is heated by the test fuel oil heater, it enters the second fuel oil line of the catalyst regenerator, and after being atomized by the second fuel oil nozzle, it enters the catalyst well to be regenerated or the bottom of the regenerator pot of the catalyst regenerator; d) the atomized steam of the test fuel oil entering the catalyst regenerator is burned and regenerated to regenerate the catalyst to be regenerated, and at the same time, the reaction heat is provided for the catalytic cracking reaction; e) after the burning and regeneration is carried out for a period of time, the catalyst in the catalyst regenerator is sampled and analyzed, and the test fuel oil meets the use requirements of the catalyst regenerator according to the analysis results. The method provided by the present invention utilizes part of the equipment and process flow of the existing double-riser fluidized bed catalytic cracking device, and optimizes and transforms it so that it can operate independently to carry out online testing of fuel oil. The method can efficiently, flexibly and economically conduct online test evaluation of fuel oils with different characteristics. Through online testing, a variety of external supplementary fuel oils with poor properties that can be processed can be found, and ultimately energy diversification can be achieved without being restricted by the market, thereby reducing the cost of using fuel oil. The method provided by the present invention is flexible and simple to operate, the process is safer, the environmental adaptability is strong, the efficiency is high, and the heating test of fuel oil can be completed in a short time, which greatly improves the test efficiency. At the same time, the method does not generate additional hazardous waste, and provides a possible technical route for reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0025] Figure 1 It is a process flow chart provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The present invention provides a method for online testing of fuel oil, comprising the following process:

[0028] a) After the test fuel oil is unloaded, it is pressurized by the fuel oil unloading pump and sent to the test fuel oil tank through the delivery pipeline;

[0029] b) the test fuel oil in the test fuel oil tank flows out from the bottom of the tank and is transported to the test fuel oil heater through the test fuel oil pump, and the heat source of the test fuel oil heater is quench oil or steam;

[0030] c) After the test fuel oil is heated by the test fuel oil heater, it enters the first fuel oil line of the catalyst regenerator, and after being atomized by the first fuel oil nozzle, it enters the catalyst well to be regenerated in the catalyst regenerator;

[0031] Alternatively, the test fuel oil is heated by the test fuel oil heater and then enters the second fuel oil line of the catalyst regenerator, and then enters the catalyst well to be regenerated or the bottom of the regenerator pot of the catalyst regenerator after being atomized by the second fuel oil nozzle;

[0032] d) burning the atomized steam of the test fuel oil entering the catalyst regenerator to regenerate the spent catalyst and provide reaction heat for the catalytic cracking reaction;

[0033] e) After the charring regeneration is performed for a period of time, the catalyst in the catalyst regenerator is sampled and analyzed, and it is determined based on the analysis results whether the test fuel oil meets the use requirements of the catalyst regenerator.

[0034] In the method provided by the present invention, in step a), the test fuel oil includes but is not limited to any one of the four fuel oils shown in Table 1, or a mixture of any of them.

[0035] Table 1 Test fuel oil information

[0036]

[0037]

[0038] In the method provided by the present invention, in step a), the inner diameter of the delivery pipeline is preferably 60-100 mm, specifically 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, 90 mm, 95 mm or 100 mm; the working pressure of the delivery pipeline is preferably 0.6-1.0 MPa, specifically 0.6 MPa, 0.7 MPa, 0.8 MPa, 0.9 MPa or 1.0 MPa; the working flow rate of the delivery pipeline is preferably 10-20 t / h, specifically 10 t / h, 11 t / h, 12 t / h, 13 t / h, 14 t / h, 15 t / h, 16 t / h, 17 t / h, 18 t / h, 19 t / h or 20 t / h.

[0039] In the method provided by the present invention, in step a), the operating temperature of the test fuel tank is preferably 115-125°C, specifically 115°C, 116°C, 117°C, 118°C, 119°C, 120°C, 121°C, 122°C, 123°C, 124°C or 125°C; the working pressure of the test fuel tank is preferably 0.1-0.15MPa, specifically 0.1MPa, 0.11MPa, 0.12MPa, 0.13MPa, 0.14MPa or 0.15MPa.

[0040] In the method provided by the present invention, in step b), the test fuel oil heater comprises a heater A and a heater B designed in parallel, the heat source of heater A is quench oil, and the heat source of heater B is steam.

[0041] In the method provided by the present invention, in step b), the cold flow inlet temperature of the heater A is preferably 115-125°C, specifically 115°C, 116°C, 117°C, 118°C, 119°C, 120°C, 121°C, 122°C, 123°C, 124°C or 125°C; the cold flow outlet temperature of the heater A is preferably 150-185°C, specifically 150°C, 155°C, 160°C, 165°C, 170°C, 175°C, 180°C or 185°C; the hot flow inlet temperature of the heater A is preferably 275-285°C, specifically 275°C, 276°C, 277°C, 278°C, 279°C, 280°C, 281°C, 282°C, 283°C, 284°C or 285°C.

[0042] In the method provided by the present invention, in step b), the cold flow inlet temperature of the heater B is preferably 115-125°C, specifically 115°C, 116°C, 117°C, 118°C, 119°C, 120°C, 121°C, 122°C, 123°C, 124°C or 125°C; the cold flow outlet temperature of the heater B is preferably 150-185°C, specifically 150°C, 155°C, 160°C, 165°C, 170°C, 175°C, 180°C or 185°C; the saturated vapor pressure at the hot flow inlet of the heater B is preferably 1.6-2.0 MPa, specifically 1.6 MPa, 1.65 MPa, 1.7 MPa, 1.75 MPa, 1.8 MPa, 1.85 MPa, 1.9 MPa, 1.95 MPa or 2.0 MPa.

[0043] In the method provided by the present invention, in step c), the pressure of the test fuel oil atomized steam obtained after atomization by the first fuel oil nozzle or the second fuel oil nozzle is preferably 0.6-1.0 MPa, specifically 0.6 MPa, 0.7 MPa, 0.8 MPa, 0.9 MPa or 1.0 MPa; the flow rate of the test fuel oil atomized steam is preferably 30-60 kg / h, specifically 30 kg / h, 35 kg / h, 40 kg / h, 45 kg / h, 50 kg / h, 55 kg / h or 60 kg / h.

[0044] In the method provided by the present invention, step e) is specifically as follows: after the char regeneration is performed for a period of time, the catalyst in the catalyst regenerator is sampled and the metal element content in the sample is analyzed. If the metal element content in the sample is lower than the set value, it is determined that the test fuel oil meets the use requirements of the catalyst regenerator.

[0045] In the method provided by the present invention, in step e), the metal element includes one or more of Ni, Fe, V, Ca, Na, As and Mg.

[0046] In the method provided by the present invention, in step e), preferably, if the contents of Ni, Fe, V, Ca, Na, As and Mg in the sample are all lower than 500 mg / kg, it is determined that the test fuel oil meets the use requirements of the catalyst regenerator.

[0047] The method provided by the present invention utilizes part of the equipment and process flow of the existing double-riser fluidized bed catalytic cracking device, and optimizes and transforms it so that it can operate independently to conduct online tests on fuel oil. The method can efficiently, flexibly and economically conduct online test evaluations on fuel oils with different characteristics. Through online tests, a variety of external supplementary fuel oils with poor properties that can be processed can be found, and ultimately energy diversification can be achieved without being restricted by the market, thereby reducing the cost of using fuel oil. The method provided by the present invention is flexible and simple to operate, the process is safer, the environment is highly adaptable, and the efficiency is high. The heating test of fuel oil can be completed in a short time, greatly improving the test efficiency. At the same time, the method does not generate additional hazardous waste, providing a possible technical route for reducing production costs.

[0048] For the purpose of greater clarity, the invention is described in detail through the following examples.

[0049] Example 1

[0050] according to Figure 1 The process shown is used to conduct online testing of fuel oil. The specific process includes:

[0051] After unloading the test fuel oil 1 (for index information, see Table 1), the fuel oil unloading pump pressurizes it to 0.6 MPa and delivers it to the test fuel oil tank (full volume 130m 3 , normal pressure operation); the test fuel oil 1 is heated to 115°C by the test fuel oil tank body heating coil, and the test fuel oil 1 flows out from the bottom of the tank and is pressurized to 0.5MPa by the test fuel oil pump and then divided into two streams, one of which returns to the test fuel oil tank and the other is sent to the test fuel oil heater A. The outgoing flow rate is controlled at 500kg / h; the test fuel oil 1 is heated to 150°C after heat exchange with the quench oil (275°C) in the test fuel oil heater A, and then enters the first fuel oil nozzle through the first fuel oil line of the catalyst regenerator. The atomizing steam pressure at the nozzle is controlled to be 0.9MPa and the atomizing steam flow rate is controlled to be 60kg / h; after being atomized by the first fuel oil nozzle, the test fuel oil 1 enters the catalyst well to be regenerated in the catalyst regenerator; the atomized steam of the test fuel oil entering the catalyst regenerator is burned to regenerate the catalyst to be regenerated, and at the same time, reaction heat is provided for the catalytic cracking reaction; the bed temperature of the catalyst regenerator is controlled at 721°C. After a period of time, the catalyst in the catalyst regenerator is sampled and analyzed. The results show that the contents of nickel (Ni), iron (Fe), vanadium (V), calcium (Ca), sodium (Na), arsenic (As), and magnesium (Mg) in the catalyst are all less than 500 mg / kg, indicating that the test fuel oil 1 meets the requirements.

[0052] Example 2

[0053] according to Figure 1The process shown is used to conduct online testing of fuel oil. The specific process includes:

[0054] After unloading, the test fuel oil 2 (for index information, see Table 1) is pressurized to 0.7 MPa by the fuel oil unloading pump and delivered to the test fuel oil tank (full volume 130m 3 , normal pressure operation); the test fuel oil 2 is heated to 120°C by the test fuel oil tank body heating coil, and the test fuel oil 2 flows out from the bottom of the tank and is pressurized to 0.6MPa by the test fuel oil pump and then divided into two streams, one of which returns to the test fuel oil tank and the other is sent to the test fuel oil heater B. The outgoing flow rate is controlled at 600kg / h; the test fuel oil 2 is heated to 160°C after heat exchange with saturated water vapor (1.8MPa) in the test fuel oil heater B, and then enters the first fuel oil nozzle through the first fuel oil line of the catalyst regenerator. The atomizing steam pressure at the nozzle is controlled to be 0.9MPa and the atomizing steam flow rate is controlled to be 55 kg / h; after being atomized by the first fuel oil nozzle, the test fuel oil 2 enters the catalyst well to be regenerated in the catalyst regenerator; the atomized steam of the test fuel oil entering the catalyst regenerator is burned and regenerated to be regenerated, and at the same time, reaction heat is provided for the catalytic cracking reaction; the bed temperature of the catalyst regenerator is controlled at 721°C. After a period of time, the catalyst in the catalyst regenerator is sampled and analyzed. The results show that the contents of nickel (Ni), iron (Fe), vanadium (V), calcium (Ca), sodium (Na), arsenic (As), and magnesium (Mg) in the catalyst are all less than 500 mg / kg, indicating that the test fuel oil 2 meets the requirements.

[0055] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for online testing of fuel oil, characterized in that: The process includes: a) After the test fuel oil is unloaded, it is pressurized by the fuel oil unloading pump and sent to the test fuel oil tank through the delivery pipeline; b) the test fuel oil in the test fuel oil tank flows out from the bottom of the tank and is transported to the test fuel oil heater through the test fuel oil pump, and the heat source of the test fuel oil heater is quench oil or steam; c) After the test fuel oil is heated by the test fuel oil heater, it enters the first fuel oil line of the catalyst regenerator, and after being atomized by the first fuel oil nozzle, it enters the catalyst well to be regenerated in the catalyst regenerator; Alternatively, the test fuel oil is heated by the test fuel oil heater and then enters the second fuel oil line of the catalyst regenerator, and then enters the catalyst well to be regenerated or the bottom of the regenerator pot of the catalyst regenerator after being atomized by the second fuel oil nozzle; d) burning the atomized steam of the test fuel oil entering the catalyst regenerator to regenerate the spent catalyst and provide reaction heat for the catalytic cracking reaction; e) After the charring regeneration is performed for a period of time, the catalyst in the catalyst regenerator is sampled and analyzed, and it is determined based on the analysis results whether the test fuel oil meets the use requirements of the catalyst regenerator.

2. The method according to claim 1, characterized in that In step a), the working pressure of the delivery pipeline is 0.6-1.0 MPa, and the working flow rate is 10-20 t / h.

3. The method according to claim 1, characterized in that In step a), the operating temperature of the test fuel oil tank is 115-125° C., and the operating pressure is 0.1-0.15 MPa.

4. The method according to claim 1, characterized in that: In step b), the test fuel oil heater comprises a heater A and a heater B designed in parallel, the heat source of heater A is quench oil, and the heat source of heater B is steam.

5. The method according to claim 4, characterized in that In step b), the cold flow inlet temperature of the heater A is 115-125°C, the cold flow outlet temperature is 150-185°C, and the hot flow inlet temperature is 275-285°C.

6. The method according to claim 4, characterized in that In step b), the cold flow inlet temperature of the heater B is 115-125° C., the cold flow outlet temperature is 150-185° C., and the saturated vapor pressure of the hot flow inlet is 1.6-2.0 MPa.

7. The method according to claim 1, characterized in that In step c), the pressure of the test fuel oil atomized steam obtained after atomization by the first fuel oil nozzle or the second fuel oil nozzle is 0.6-1.0 MPa, and the flow rate is 30-60 kg / h.

8. The method according to claim 1, characterized in that Step e) is specifically: After the charring regeneration is carried out for a period of time, the catalyst in the catalyst regenerator is sampled and the metal element content in the sample is analyzed. If the metal element content in the sample is lower than the set value, it is determined that the test fuel oil meets the use requirements of the catalyst regenerator.

9. The method according to claim 8, characterized in that In step e), the metal element includes one or more of Ni, Fe, V, Ca, Na, As and Mg.

10. The method according to claim 8, characterized in that In step e), if the contents of Ni, Fe, V, Ca, Na, As and Mg in the sample are all lower than 500 mg / kg, it is determined that the test fuel oil meets the use requirements of the catalyst regenerator.

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