High-efficiency low-resistance flue gas waste heat recovery device of oil field steam-injection boiler and use method

Abstract

The invention relates to the technical field of oil field steam-injection boiler devices, in particular to an efficient low-resistance flue gas waste heat recovery device of an oil field steam-injection boiler and a using method.The efficient low-resistance flue gas waste heat recovery device of the oil field steam-injection boiler comprises a transition smoke box, a flue gas condenser, a supporting frame, a boiler burner, a boiler fan and a convection section, and a plurality of flue gas heat exchange channels are formed among a first inlet end, a first outlet end and a heat exchange plate; a combustion-supporting air heat exchange channel is formed among the second inlet end, the second outlet end and the smoke heat exchange channel, the convection section is communicated with a boiler smoke inlet pipeline, the convection section is communicated with the transition smoke box, a high-temperature smoke conveying pipeline is communicated between the transition smoke box and the first inlet end, and a cold air pipeline is communicated between the boiler fan and the second inlet end. The device is simple and easy to operate, the heat efficiency of the boiler is improved, the smoke resistance is reduced to about 200 Pa, the consumption of electric energy and fuel gas is reduced, meanwhile, the occupied area is reduced, the production benefits are improved, and the green, low-carbon, energy-saving and environment-friendly production targets of enterprises can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of oil field steam injection boiler devices, in particular to a high-efficiency and low-resistance flue gas waste heat recovery device of an oil field steam injection boiler and a use method thereof. Background Art

[0002] When the oil field steam injection boiler operates normally, the flue gas temperature is in the range of 160℃ to 240℃, and the calorific value it carries is relatively high. Therefore, the waste heat of the flue gas will be recovered and utilized through appropriate devices during production.

[0003] The existing flue gas waste heat utilization device requires a large amount of concrete foundation during its setting and installation, which will occupy a large amount of boiler site and increase the workload of infrastructure construction; and because the installation position of the transition smoke box and the existing conventional flue gas condensing device makes the flue gas resistance large, it is necessary to install an induced draft fan for pressurization.

[0004] Therefore, the existing flue gas waste heat utilization device of the oil field steam injection boiler has the following problems: (1) the flue gas resistance is large, which poses a safety hazard; (2) the structure is large and the mass is large; (3) the corrosion is serious. Summary of the invention

[0005] The present invention provides a high-efficiency, low-resistance flue gas waste heat recovery device and a method of use for an oilfield steam injection boiler, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the existing problems of high flue gas resistance, large floor space and insufficient heat source utilization in the flue gas waste heat recovery of oilfield steam injection boilers.

[0006] One of the technical solutions of the present invention is achieved through the following measures: a high-efficiency and low-resistance flue gas waste heat recovery device for an oilfield steam injection boiler, comprising a transition smoke box, a smoke condenser, a support frame, a boiler burner, a boiler fan and a convection section, the boiler fan is arranged on the ground, the smoke condenser is fixedly installed on the support frame, the smoke condenser is horizontally fixedly connected to the transition smoke box, the transition smoke box is fixedly installed on the top of the convection section, the smoke condenser is provided with a first inlet end, a second inlet end, a first outlet end, a second outlet end and a plurality of heat exchange plates, the first inlet end, the first outlet end and each adjacent A plurality of flue gas heat exchange channels are formed between the two heat exchange plates, a plurality of combustion-supporting air heat exchange channels are formed between the second inlet end, the second outlet end and each adjacent flue gas heat exchange channel, the inlet end of the convection section is fixedly connected with a boiler flue gas inlet pipeline, the outlet end of the convection section is fixedly connected with the inlet of a transition smoke box, a high-temperature flue gas delivery pipeline is fixedly connected between the outlet of the transition smoke box and the first inlet end, a low-temperature flue gas output pipeline is fixedly connected with the first outlet end, a cold air pipeline is fixedly connected between the outlet end of the boiler fan and the second inlet end, and a hot air pipeline is fixedly connected between the second outlet end and the inlet of the boiler burner.

[0007] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions: A heat exchange plate is provided between the flue gas heat exchange channel and the adjacent combustion air heat exchange channel, and the flue gas flow direction of the flue gas heat exchange channel is perpendicular to the combustion air flow direction of the combustion air heat exchange channel.

[0008] A boiler body skid is fixedly mounted on the bottom of the support frame.

[0009] The second technical solution of the present invention is achieved through the following measures: a method for using a high-efficiency, low-resistance flue gas waste heat recovery device for an oilfield steam injection boiler, which is carried out according to the following steps: the first step is that the high-temperature flue gas generated by the oilfield gas injection boiler enters the convection section through the boiler flue gas inlet pipeline, and is output to the flue gas heat exchange channel of the flue gas condenser after passing through the transition smoke box; the second step is that the low-temperature combustion air is transported to the combustion air heat exchange channel of the flue gas condenser through the boiler fan; the third step is that the high-temperature flue gas and the low-temperature combustion air perform convection heat exchange in the flue gas condenser; the fourth step is that the low-temperature flue gas after heat exchange and cooling is output through the low-temperature flue gas output pipeline, and the heated combustion air after heat exchange and heating is sent to the boiler burner through the hot air pipeline for use as a combustion gas source.

[0010] The following is a further optimization and / or improvement of the second technical solution of the above invention: The high-temperature flue gas generated by the above-mentioned oil field gas injection boiler has a temperature of 160°C to 240°C.

[0011] The temperature of the low-temperature flue gas after the above heat exchange and cooling is 55°C to 65°C.

[0012] The temperature of the heated combustion-supporting air is 110°C to 130°C.

[0013] The device of the present invention is simple and easy to operate, improves the thermal efficiency of the boiler, reduces the consumption of electricity and gas, and at the same time reduces the floor space, improves production efficiency, and can achieve the green, low-carbon, energy-saving and environmentally friendly production goals of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attached Figure 1 This is a schematic diagram of the structure of the flue gas condenser in Example 1 of the present invention.

[0015] Attached Figure 2 This is a schematic diagram showing the process flow of the high-efficiency and low-resistance flue gas waste heat recovery device for the oilfield steam injection boiler in Example 1 of the present invention.

[0016] Attached Figure 3 This is a schematic front view of the three-dimensional structure of the high-efficiency and low-resistance flue gas waste heat recovery device of the oil field steam injection boiler in Example 1 of the present invention.

[0017] Attached Figure 4 This is a simplified rear view of the three-dimensional structure of the high-efficiency and low-resistance flue gas waste heat recovery device of the oil field steam injection boiler in Example 1 of the present invention.

[0018] The codes in the accompanying drawings are: 1 is a transition smoke box, 2 is a flue gas condenser, 3 is a supporting frame, 4 is a boiler burner, 5 is a boiler fan, 6 is a convection section, 7 is a first inlet end, 8 is a second inlet end, 9 is a first outlet end, 10 is a second outlet end, 11 is a heat exchange plate, 12 is a boiler flue gas inlet pipeline, 13 is a high-temperature flue gas delivery pipeline, 14 is a low-temperature flue gas output pipeline, 15 is a cold air pipeline, 16 is a hot air pipeline, 17 is a flue gas heat exchange channel, and 18 is a combustion air heat exchange channel. DETAILED DESCRIPTION

[0019] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solutions of the present invention and actual conditions. In the present invention, unless otherwise specified, the equipment and devices used are all known and commonly used equipment and devices in the art.

[0020] The present invention will be further described below in conjunction with embodiments: Embodiment 1: As attached Figure 1 , 2 , 3 and 4, the high-efficiency and low-resistance flue gas waste heat recovery device of the oilfield steam injection boiler includes a transition smoke box 1, a smoke condenser 2, a support frame 3, a boiler burner 4, a boiler fan 5 and a convection section 6, the boiler fan 5 is arranged on the ground, the smoke condenser 2 is fixedly installed on the support frame 3, the smoke condenser 2 is horizontally fixedly connected to the transition smoke box 1, the transition smoke box 1 is fixedly installed on the top of the convection section 6, the smoke condenser 2 is provided with a first inlet end 7, a second inlet end 8, a first outlet end 9, a second outlet end 10 and a plurality of layers of heat exchange plates 11, and the first inlet end 7, the first outlet end 9 and each adjacent two heat exchange plates 11 form A plurality of flue gas heat exchange channels 17 are provided, and a plurality of combustion air heat exchange channels 18 are formed between the second inlet end 8, the second outlet end 10 and each adjacent flue gas heat exchange channel 17; the inlet end of the convection section 6 is fixedly connected with a boiler flue gas inlet pipeline 12; the outlet end of the convection section 6 is fixedly connected with the inlet of the transition smoke box 1; a high-temperature flue gas delivery pipeline 13 is fixedly connected between the outlet of the transition smoke box 1 and the first inlet end 7; a low-temperature flue gas output pipeline 14 is fixedly connected to the first outlet end 9; a cold air pipeline 15 is fixedly connected between the outlet end of the boiler fan 5 and the second inlet end 8; a hot air pipeline 16 is fixedly connected between the second outlet end 10 and the inlet of the boiler burner 4.

[0021] The present invention horizontally sends the high-temperature flue gas generated during the normal operation of the oil field steam injection boiler into the flue gas condenser 2. The high-temperature flue gas and the low-temperature combustion air perform efficient convection heat exchange through the heat exchange plate 11 inside the flue gas condenser 2, thereby effectively reducing the exhaust temperature of the steam injection boiler and increasing the combustion air temperature, thereby improving the thermal efficiency of the boiler.

[0022] Embodiment 2: As an optimization of the above embodiment, as shown in the attached Figure 1As shown, a heat exchange plate 11 is provided between the flue gas heat exchange channel 17 and the adjacent combustion air heat exchange channel 18 , and the flue gas flow direction of the flue gas heat exchange channel 17 is perpendicular to the combustion air flow direction of the combustion air heat exchange channel 18 .

[0023] Embodiment 3: As an optimization of the above embodiment, as shown in the attached Figure 3 As shown, a boiler body skid is fixedly mounted on the bottom of the support frame 3 .

[0024] Since the flue gas condenser 2 of the present invention has a small size, it can be installed on the top of the boiler with the support frame 3, shortening the distance of the flue gas channel, effectively reducing the generation and accumulation of condensed water in the channel, and avoiding the occurrence of ice in the flue gas channel in winter. At the same time, since the support frame 3 is installed on the boiler body skid, no concrete foundation is required, so the occupation of the boiler site and the workload of infrastructure construction can be effectively reduced. In addition, since the high-temperature flue gas enters the flue gas condenser 2 horizontally, the resistance generated is small (<200Pa), and there is no need to install an induced draft fan for pressurization, which reduces the production cost. According to needs, the main material of the device can be 304 stainless steel, and the corrosion resistance is also significantly improved.

[0025] As required, the pipelines and equipment of the high-efficiency and low-resistance flue gas waste heat recovery device of the oilfield steam injection boiler can also be equipped with conventional valves, thermometers and pressure gauges known in the art according to production needs.

[0026] Embodiment 4: As attached Figure 1 , 2 As shown in Figures 3 and 4, the method for using the high-efficiency and low-resistance flue gas waste heat recovery device of the oilfield steam injection boiler is carried out according to the following steps: In the first step, the high-temperature flue gas generated by the oilfield gas injection boiler enters the convection section 6 through the boiler flue gas inlet pipeline 12, and is output to the flue gas heat exchange channel 17 of the flue gas condenser 2 after passing through the transition smoke box 1; In the second step, the low-temperature combustion air is transported to the combustion air heat exchange channel 18 of the flue gas condenser 2 through the boiler fan 5; In the third step, the high-temperature flue gas and the low-temperature combustion air perform convection heat exchange in the flue gas condenser 2; In the fourth step, the low-temperature flue gas after heat exchange and cooling is output through the low-temperature flue gas output pipeline 14, and the heated combustion air after heat exchange and heating is sent to the boiler burner 4 through the hot air pipeline 16 for use as a combustion gas source.

[0027] Embodiment 5: As an optimization of the above embodiment, the temperature of the high-temperature flue gas generated by the oil field gas injection boiler is 160°C to 240°C.

[0028] Embodiment 6: As an optimization of the above embodiment, the temperature of the low-temperature flue gas after heat exchange and cooling is 55°C to 65°C.

[0029] Embodiment 7: As an optimization of the above embodiment, the temperature of heating the combustion-supporting air is 110°C to 130°C.

[0030] Compared with the existing flue gas waste heat recovery device, the present invention has a size reduction of about 70%, a weight reduction of about 60%, a floor area reduction of nearly 90%, a flue gas and air resistance reduction of about 75%, a significantly improved corrosion resistance of the equipment, and effectively avoids the occurrence of ice formation in the flue gas channel in winter. The start and stop of the induced draft fan and the flue gas switching operation of the electric three-way valve effectively reduce the workload of the operator and reduce the power consumption. The flue gas resistance of the oil field gas injection boiler can be reduced to about 200Pa, and the thermal efficiency can be increased from 86.1% to more than 94.0%, with significant social and economic benefits.

[0031] In summary, the device of the present invention is simple and easy to operate, improves the thermal efficiency of the boiler, reduces the consumption of electricity and gas, and at the same time reduces the floor space, improves production efficiency, and can achieve the company's green, low-carbon, energy-saving and environmentally friendly production goals.

[0032] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A high-efficiency, low-resistance flue gas waste heat recovery device for an oilfield steam injection boiler, characterized in that The utility model comprises a transition smoke box, a smoke condenser, a support frame, a boiler burner, a boiler fan and a convection section. The boiler fan is arranged on the ground, the smoke condenser is fixedly installed on the support frame, the smoke condenser is horizontally fixedly connected with the transition smoke box, the transition smoke box is fixedly installed on the top of the convection section, the smoke condenser is provided with a first inlet end, a second inlet end, a first outlet end, a second outlet end and a plurality of layers of heat exchange plates, a plurality of smoke heat exchange channels are formed between the first inlet end, the first outlet end and each adjacent two heat exchange plates, a plurality of combustion-supporting air heat exchange channels are formed between the second inlet end, the second outlet end and each adjacent smoke heat exchange channels, the inlet end of the convection section is fixedly connected with a boiler smoke inlet pipeline, the outlet end of the convection section is fixedly connected with the inlet of the transition smoke box, a high-temperature smoke delivery pipeline is fixedly connected between the outlet of the transition smoke box and the first inlet end, a low-temperature smoke output pipeline is fixedly connected with the first outlet end, a cold air pipeline is fixedly connected between the outlet end of the boiler fan and the second inlet end, and a hot air pipeline is fixedly connected between the second outlet end and the inlet of the boiler burner.

2. The high-efficiency and low-resistance flue gas waste heat recovery device for oil field steam injection boiler according to claim 1 is characterized in that Heat exchange plates are arranged between the flue gas heat exchange channel and the adjacent combustion air heat exchange channel, and the flue gas flow direction of the flue gas heat exchange channel is perpendicular to the combustion air flow direction of the combustion air heat exchange channel.

3. The high-efficiency and low-resistance flue gas waste heat recovery device for an oilfield steam injection boiler according to claim 1 or 2, characterized in that A boiler body skid is fixedly installed at the bottom of the supporting frame.

4. A method for using the high-efficiency, low-resistance flue gas waste heat recovery device for an oilfield steam injection boiler according to claim 1, 2 or 3, characterized in that Proceed in the following steps: First, the high-temperature flue gas generated by the oilfield gas injection boiler enters the convection section through the boiler flue gas inlet pipeline, and is output to the flue gas heat exchange channel of the flue gas condenser after passing through the transition smoke box; Second, the low-temperature combustion air is transported to the combustion air heat exchange channel of the flue gas condenser through the boiler fan; Third, the high-temperature flue gas and the low-temperature combustion air perform convection heat exchange in the flue gas condenser; Fourth, the low-temperature flue gas after heat exchange and cooling is output through the low-temperature flue gas output pipeline, and the heated combustion air after heat exchange and heating is sent to the boiler burner through the hot air pipeline for use as a combustion gas source.

5. The method of use according to claim 4, characterized in that The high-temperature flue gas generated by the oilfield gas injection boiler has a temperature of 160°C to 240°C.

6. The method of use according to claim 4, characterized in that The temperature of the low-temperature flue gas after heat exchange and cooling is 55°C to 65°C.

7. The method of use according to claim 5, characterized in that The temperature of the low-temperature flue gas after heat exchange and cooling is 55°C to 65°C.

8. The method of use according to claim 4, characterized in that The temperature of the heated combustion air is 110°C to 130°C.

9. The method of use according to claim 5, 6 or 7, characterized in that The temperature of the heated combustion air is 110°C to 130°C.

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