Afterburning type waste heat exchange boiler

Abstract

The utility model provides an afterburning type waste heat exchange boiler which comprises a waste heat exchange boiler body, an auxiliary afterburning mechanism is arranged at the position, close to a high-temperature smoke inlet of the waste heat exchange boiler body, in the waste heat exchange boiler body, and when the temperature of smoke entering the waste heat exchange boiler body is insufficient, the auxiliary afterburning mechanism is started. The auxiliary afterburning mechanism burns fuel in the waste heat exchange boiler body to increase the smoke temperature and assist the waste heat exchange boiler in normal heat exchange, so that the waste heat exchange boiler body effectively outputs steam or hot water, the waste heat utilization efficiency is improved, the waste heat exchange boiler body reaches the designed optimal operation state, and the energy consumption is reduced. According to the waste heat exchange boiler, the requirements of enterprises for efficient waste heat utilization and stable load of the waste heat exchange boiler are met, in addition, the auxiliary afterburning mechanism is arranged in the waste heat exchange boiler body, an afterburning chamber and an afterburning boiler evaporation section do not need to be additionally arranged, the equipment investment cost is saved, the occupied space is small, and the waste heat exchange boiler body can be fully utilized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a waste heat boiler technical field, concretely relates to a supplementary combustion type waste heat boiler. BACKGROUND

[0002] A waste heat boiler is a kind of high-efficiency energy-saving equipment, it is mainly applied to industrial production (such as chemical industry, steel and electric power), aims at recycling and utilizing the high-temperature flue gas or waste heat generated in industrial process, converts it into usable heat energy, such as steam or hot water, to improve energy utilization efficiency and reduce environmental pollution.

[0003] If the upstream production equipment (such as chemical production, steel manufacturing and electric power equipment) runs unstably, such as running failure or low-power running, the high-temperature flue gas generated cannot meet the heat exchange requirements of the waste heat boiler during the operation process of the waste heat boiler, thereby leading to unstable operation of the waste heat boiler and cannot effectively output steam or hot water.

[0004] In view of the technical problem, in the prior art, the authorized announcement No.

[0005] The supplementary combustion type waste heat boiler is provided with a supplementary combustion chamber, the supplementary combustion chamber is provided with a supplementary combustion burner, the flue gas outlet end of the supplementary combustion chamber is connected and penetrated with the waste heat boiler flue located between the evaporation section and the coal-saving section of the original waste heat boiler through the adapter flue, two groups of supplementary combustion furnace evaporation sections need to be additionally arranged in the adapter flue, the connecting end of the adapter flue and the waste heat boiler flue is provided with a first flue gate valve plate, the flue gas inlet of the waste heat boiler flue is provided with a second flue gate valve plate, when the high-temperature flue gas generated due to unstable operation of the upstream equipment cannot meet the operation requirements of the waste heat boiler, the first flue gate valve plate is opened, the second flue gate valve plate is closed, and the hot flue gas generated by the supplementary combustion burner is used to successively flush the membrane type water cooling wall, two groups of supplementary combustion furnace evaporation sections, the coal-saving section and the preheating section to produce steam, since the waste heat boiler needs to be externally provided with the supplementary combustion chamber and additionally provided with two groups of supplementary combustion furnace evaporation sections, a larger floor space is needed in the production site to place the supplementary combustion chamber, and additionally arranging two groups of supplementary combustion furnace evaporation sections also increases the production cost of the equipment. SUMMARY

[0006] Therefore, it is necessary to provide a supplementary combustion type waste heat boiler to solve the technical problems of large floor space and high equipment production cost in the prior art.

[0007] The utility model discloses a technical scheme adopted to solve the technical problems is:

[0008] The application discloses a supplementary combustion type waste heat recovery boiler, which comprises a waste heat recovery boiler body, wherein an auxiliary supplementary combustion mechanism is arranged in the waste heat recovery boiler body and close to a high-temperature flue gas inlet of the waste heat recovery boiler body; when the temperature of the flue gas entering the waste heat recovery boiler body is insufficient, the auxiliary supplementary combustion mechanism burns fuel in the waste heat recovery boiler body to increase the temperature of the flue gas and assist the waste heat recovery boiler in normal heat exchange.

[0009] Preferably, the auxiliary supplementary combustion mechanism comprises a burner and a biomass gasification furnace; the combustion port of the burner is arranged in the waste heat recovery boiler body and close to the high-temperature flue gas inlet of the waste heat recovery boiler body; the fuel output end of the biomass gasification furnace is connected with the fuel input end of the burner and provides combustible gasification substances to the burner.

[0010] Preferably, the auxiliary supplementary combustion mechanism further comprises a temperature sensor and a controller; the temperature sensor is arranged on the high-temperature flue gas inlet of the waste heat recovery boiler body; the temperature sensor, the burner and the biomass gasification furnace are electrically connected with the controller respectively; the temperature sensor is used for detecting the temperature of the flue gas on the high-temperature flue gas inlet and transmitting the detected flue gas temperature signal to the controller; the controller receives the flue gas temperature signal detected by the temperature sensor, converts the received flue gas temperature signal into a corresponding temperature value, compares the temperature value with a preset temperature value in the controller, and when the temperature value is less than the preset temperature value, the controller controls the biomass gasification furnace to provide combustible gasification substances to the burner and controls the burner to ignite, so as to assist the waste heat recovery boiler in heat exchange.

[0011] Preferably, the auxiliary supplementary combustion mechanism further comprises a blower, which is arranged on the burner and blows air to the burner to assist the burner in combustion.

[0012] Preferably, the auxiliary supplementary combustion mechanism further comprises a heat pipe type air preheater, which is arranged on the tail gas outlet of the waste heat recovery boiler body; the air heat exchange port of the heat pipe type air preheater is connected with the air inlet of the blower; the heat pipe type air preheater utilizes the waste heat of the tail gas discharged from the waste heat recovery boiler body to heat the air entering the blower.

[0013] Preferably, the firepower of the burner is adjustable.

[0014] From the above technical scheme can be known, the application provides the afterburning waste heat heat exchange boiler, through setting up the auxiliary afterburning mechanism in the waste heat heat exchange boiler body near the high temperature flue gas import of the waste heat heat exchange boiler body, when the temperature of the flue gas entering the waste heat heat exchange boiler body is insufficient, the auxiliary afterburning mechanism is combusted to provide heat for the furnace cavity of the waste heat heat exchange boiler to improve the temperature of the flue gas, and then increase the heat exchange temperature in the waste heat heat exchange boiler body, make the waste heat heat exchange boiler body effectively output steam or hot water, thereby improve the utilization efficiency of waste heat, make the waste heat heat exchange boiler body reach the best operating state of design, meet the demand of enterprise to high efficiency waste heat utilization and waste heat heat exchange boiler stable load, and, through setting up the auxiliary afterburning mechanism in the waste heat heat exchange boiler body, do not need to set up the afterburning chamber and the afterburning furnace evaporation section additionally, save the equipment investment cost, small footprint, can fully utilize the waste heat heat exchange boiler body. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the functional structure schematic view of the utility model.

[0016] In the drawing: waste heat heat exchange boiler body 10, high temperature flue gas import 11, tail gas outlet 12, evaporator 13, auxiliary afterburning mechanism 20, burner 21, biomass gasification furnace 22, temperature sensor 23, air blower 24, heat pipe type air preheater 25. DETAILED DESCRIPTION

[0017] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the drawing needed in the embodiment will be briefly introduced as follows, obviously, the drawing in the following description is some embodiments of the utility model, for the ordinary skilled person in the art, under the premise of not paying the creative labor, other drawings can also be obtained according to these drawings.

[0018] Please refer to Figure 1The utility model embodiment provides a kind of afterburning waste heat heat exchange boiler, including waste heat heat exchange boiler body 10, the one end of waste heat heat exchange boiler body 10 is equipped with high-temperature flue gas import 11, its other end is provided with tail gas outlet 12, the high-temperature flue gas import 11 is used to connect with the high-temperature flue gas discharge port of upstream equipment (such as: chemical production, steel manufacturing and electric power equipment), waste heat heat exchange boiler body 10 is sequentially arranged with multiple groups of evaporator 13 by ascending pipe cluster in waste heat heat exchange boiler body 10 along high-temperature flue gas import 11 to tail gas outlet 12 direction, auxiliary afterburning mechanism 20 is arranged in waste heat heat exchange boiler body 10 close to the high-temperature flue gas import 11 of waste heat heat exchange boiler body 10, when the flue gas temperature generated by upstream equipment entering waste heat heat exchange boiler body 10 is insufficient, the auxiliary afterburning mechanism 20 burns fuel in waste heat heat exchange boiler body 10, to improve flue gas temperature, in turn increase the heat exchange temperature in waste heat heat exchange boiler body 10, to assist the heat exchange of evaporator 13 in waste heat heat exchange boiler, make waste heat heat exchange boiler body 10 effective output steam or hot water, reach the best operating state of design, to improve the utilization efficiency of waste heat.

[0019] Specifically, the auxiliary afterburning mechanism 20 includes a burner 21 and a biomass gasifier 22. The combustion port of the burner 21 is arranged close to the high-temperature flue gas import 11 of the waste heat heat exchange boiler body 10 in the waste heat heat exchange boiler body 10. The fuel output end of the biomass gasifier 22 is connected with the fuel input end of the burner 21 and provides combustible gas to the burner 21. When the high-temperature flue gas temperature entering the waste heat heat exchange boiler body 10 is insufficient, the burner 21 can directly burn in the waste heat heat exchange boiler body 10 to supplement the heat exchange temperature in the waste heat heat exchange boiler body 10 and assist the heat exchange of the evaporator 13 in the waste heat heat exchange boiler body 10. The biomass gasifier 22 uses biomass straw or municipal waste, agricultural non-point source pollutants, etc. as gasification materials. Using biomass straw or municipal waste, agricultural non-point source pollutants, etc. as gasification materials not only improves the green energy utilization rate and energy saving and consumption reduction of enterprises, but also harmless environmental protection treatment of the above-mentioned materials. Using the gasification materials generated by the biomass gasifier as fuel for afterburning in the waste heat heat exchange boiler body 10 not only improves the operation efficiency of the waste heat heat exchange boiler body 10, but also reduces the operation cost of enterprises due to the low cost of biomass gasification fuel. The biomass gasifier 22 can be arranged according to the actual demand of production site.

[0020] Further, the auxiliary combustion mechanism 20 further comprises a temperature sensor 23 and a controller, the temperature sensor 23 is arranged on the high-temperature flue gas inlet 11 of the waste heat recovery boiler body 10, the controller adopts an integrated circuit or a power supply controller, the temperature sensor 23, the burner 21 and the biomass gasifier 22 are electrically connected with the controller respectively, the temperature sensor 23 is used for detecting the flue gas temperature on the high-temperature flue gas inlet 11 and transmitting the detected flue gas temperature signal to the controller, the controller receives the flue gas temperature signal detected by the temperature sensor 23, converts the received flue gas temperature signal into a corresponding temperature value, and compares the temperature value with a preset temperature value in the controller, when the temperature value is less than the preset temperature value, the controller controls the biomass gasifier 22 to provide combustible gasification substances to the burner 21 and controls the burner 21 to ignite, so as to assist the waste heat recovery boiler to exchange heat, and a burner 21 controller is arranged on the burner 21, the controller is electrically connected with the burner 21 controller, and the controller can control the burner 21 controller according to the flue gas temperature value on the high-temperature flue gas inlet 11, so as to dynamically adjust the firepower of the burner 21, make the waste heat recovery boiler body 10 effectively output steam or hot water, and thus improve the utilization efficiency of waste heat.

[0021] Please continue to see Figure 1 Further, the auxiliary combustion mechanism 20 further comprises a blower 24, the blower 24 is arranged on the burner 21 and blows air to the burner 21, so as to assist the burner 21 to burn in the waste heat recovery boiler body 10 and improve the combustion efficiency.

[0022] The auxiliary combustion mechanism 20 further comprises a heat pipe type air preheater 25, the heat pipe type air preheater 25 is arranged on the tail gas outlet 12 of the waste heat recovery boiler body 10, an air heat exchange port of the heat pipe type air preheater 30 is connected with an air inlet of the blower 24, the heat pipe type air preheater 25 is used for waste heat utilization of the tail gas discharged from the waste heat recovery boiler body 10, so as to heat the air entering the blower 24, the heated air is mixed with the gasification substance fuel delivered by the biomass gasifier 22, not only can ensure that the gasification substance fuel can be fully combusted, but also can avoid that low-temperature air affects the flue gas temperature in the waste heat recovery boiler body 10, so that the waste heat recovery boiler body reaches the best operating state designed, and meets the needs of enterprises on efficient waste heat utilization and stable load of the waste heat recovery boiler.

[0023] The working process of the afterburning waste heat heat exchange boiler is as follows: when the upstream equipment is normally and stably operated, the temperature value of the high-temperature flue gas discharged into the afterburning waste heat heat exchange boiler body 10 is greater than the preset temperature value of the controller, and the burner 21 is in a non-working state; when the upstream equipment is operated in failure or at low power, that is, when the temperature value of the high-temperature flue gas discharged into the afterburning waste heat heat exchange boiler body 10 is lower than the preset temperature value of the controller, the controller controls the biomass gasification furnace 22 to deliver the combustible gasification material to the burner 21, and controls the burner 21 to ignite, so as to afterburn the high-temperature flue gas entering the afterburning waste heat heat exchange boiler body 10, increase the temperature of the high-temperature flue gas, assist the afterburning waste heat heat exchange boiler body 10 to exchange heat, and effectively output steam or hot water from the afterburning waste heat heat exchange boiler body 10, so as to improve the utilization efficiency of the waste heat.

[0024] The afterburning waste heat heat exchange boiler produces the combustible gasification material by the biomass gasification furnace to afterburn, which not only can improve the operation efficiency of the afterburning waste heat heat exchange boiler body 10, but also can realize the harmless and environmental protection treatment of the agricultural non-point source pollutants, urban garbage and other wastes by the biomass gasification furnace. This will greatly promote the development of the afterburning waste heat heat exchange boiler technology, meet the needs of enterprises for efficient waste heat utilization, reduction of energy waste and stable load operation of the waste heat boiler. Moreover, the afterburning waste heat heat exchange boiler has simple structure, is easy to transform and install the traditional waste heat heat exchange boiler, has short construction period, does not need to make large-scale transformation to the existing equipment, thereby saves the equipment investment and reduces the operation cost of the enterprise.

[0025] The above disclosed is only the preferred embodiment of the utility model, of course, cannot limit the right scope of the utility model by this, the person skilled in the art can understand that all or part of the processes of the above-mentioned embodiments are realized, and the equivalent changes made according to the utility model claim still belong to the range covered by the utility model.

Claims

1. A supplementary combustion type waste heat exchange boiler, comprising a waste heat exchange boiler body, characterized in that: An auxiliary combustion mechanism is installed at the high-temperature flue gas inlet near the main body of the waste heat exchange boiler. When the temperature of the flue gas entering the main body of the waste heat exchange boiler is insufficient, the auxiliary combustion mechanism burns fuel in the main body of the waste heat exchange boiler to increase the flue gas temperature and assist the waste heat exchange boiler in normal heat exchange. The auxiliary combustion mechanism includes a burner and a biomass gasifier. The combustion port of the burner is located in the body of the waste heat exchange boiler near the high-temperature flue gas inlet of the waste heat exchange boiler body. The fuel output end of the biomass gasifier is connected to the fuel input end of the burner and provides combustible gasified material to the burner. The auxiliary combustion mechanism also includes a temperature sensor and a controller. The temperature sensor is installed at the high-temperature flue gas inlet of the waste heat exchange boiler body. The temperature sensor, burner, and biomass gasifier are electrically connected to the controller. The temperature sensor is used to detect the flue gas temperature at the high-temperature flue gas inlet and transmit the detected flue gas temperature signal to the controller. The controller receives the flue gas temperature signal detected by the temperature sensor, converts the received flue gas temperature signal into a corresponding temperature value, and compares the temperature value with a preset temperature value in the controller. When the temperature value is less than the preset temperature value, the controller controls the biomass gasifier to provide combustible gasified material to the burner and controls the burner to ignite, so as to assist the waste heat exchange boiler in heat exchange. The auxiliary combustion mechanism also includes a blower, which is installed on the burner to supply air to the burner to assist combustion. The auxiliary combustion mechanism also includes a heat pipe air preheater, which is installed at the exhaust gas outlet of the waste heat exchange boiler body. The air heat exchange port of the heat pipe air preheater is connected to the air inlet of the blower. The heat pipe air preheater utilizes the waste heat of the exhaust gas discharged from the waste heat exchange boiler body to heat the air entering the blower.

2. The supplementary combustion waste heat exchange boiler as described in claim 1, characterized in that: The burner's flame intensity is adjustable.

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