Coking multi-heat-source step-by-step recycling equipment

Abstract

The utility model discloses coking multi-heat-source step-by-step recycling equipment which comprises a first-stage recycling chain, a second-stage recycling chain and a third-stage recycling chain, and the first-stage recycling chain comprises a first production chain, a dry quenching sensible heat recoverer and a steam turbine; the secondary recycling chain comprises a second production chain and a flue gas waste heat recoverer; the third-stage recycling chain comprises a third production chain, a circulating ammonia water tank, a circulating ammonia water pump and an absorption type hot water unit; different heat sources in coking red coke, flue gas, raw coke oven gas, coke quenching tank waste gas, circulating ammonia water, primary cooler upper section coal gas and cooling circulating water in the coking production process are subjected to waste heat recovery and converted into various energy sources such as electric power, steam and hot water, deep utilization of heat energy in the coking process is achieved, the heat efficiency of the system is extreme, and energy conservation, carbon reduction and cost reduction are achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of industrial waste heat recycling, especially relates to a coking multi-heat source step-by-step recycling equipment. BACKGROUND

[0002] The coking industry has high energy consumption and heavy pollution, which has attracted much attention in the industry. From the whole energy flow and material flow balance of the coke oven production, the sensible heat carried out by the 950-1050 DEG C red-hot coke from the coke oven carbonization chamber accounts for about 37% of the total coke oven heat output; the sensible heat contained in the 650-750 DEG C temperature of the raw gas entering the coke oven riser accounts for about 36% of the total coke oven heat output; the waste heat carried out by the 180-230 DEG C coke oven flue gas accounts for about 16% of the total coke oven heat output; the various heat loss of the coke oven body surface accounts for about 11% of the total coke oven heat output; at the same time, there are different sources of multi-heat sources such as quenching tank waste gas, circulating ammonia water, primary cooler upper section gas, cooling circulating water, therefore, the high-efficiency step-by-step recycling and gradient utilization of the waste heat resources generated in the coke oven coking process has become one of the main ways to improve the energy utilization efficiency of the coke oven, and is also the main development direction and potential of resource saving and energy saving.

[0003] So far, many researches have been carried out on the energy-saving technology of the coking area at home and abroad, and many achievements have been made. The sensible heat of the red coke in the high-temperature section has been recycled by the mature commercialized dry quenching sensible heat recovery technology, which can cool the 950-1100 DEG C red-hot coke to about 200 DEG C, realizes the efficient recovery of the sensible heat of the red-hot coke, and has become one of the energy-saving technologies promoted by the state. The sensible heat recovery of the coke oven raw gas and the coke oven flue gas waste heat recovery technology in the low-temperature section have also been commercially applied. Although the above-mentioned several waste heats have corresponding heat recovery means, the overall heat recovery and utilization efficiency is not high due to the mutual isolation of each measure. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a coking multi-heat source step-by-step recycling equipment, realizing the deep utilization of the heat energy in the coking process, the extreme heat efficiency of the system, and energy saving and cost reduction.

[0005] To solve the above problems, the technical scheme of the utility model is as follows:

[0006] A coking multi-heat source step-by-step recycling equipment, comprising: a first recycling chain, a second recycling chain, and a third recycling chain.

[0007] The first recycling chain comprises a first production chain, a dry quenching sensible heat recovery device, and a steam turbine, wherein the coke outflow port of the dry quenching device in the first production chain is communicated with the inlet of the dry quenching sensible heat recovery device, the outlet of the dry quenching sensible heat recovery device is connected with the gas inlet of the steam turbine, and the coking red coke produced by the dry quenching device is converted into electric power for electric equipment.

[0008] The second recycling chain comprises a second production chain and a flue gas waste heat recovery device, wherein the gas outlet of the flue gas purifier in the second production chain is connected with the gas inlet of the flue gas waste heat recovery device, and the flue gas output by the flue gas purifier is converted into steam for steam equipment.

[0009] The third recycling chain comprises a third production chain, a circulating ammonia water tank, a circulating ammonia water pump and an absorption type hot water unit, wherein the tar ammonia water separator of the third production chain is communicated with the circulating ammonia water tank, the water inlet pipe of the circulating ammonia water pump is arranged in the circulating ammonia water tank, and the water outlet pipe of the circulating ammonia water pump is connected with the absorption type hot water unit, so that the circulating ammonia water separated by the tar ammonia water separator is converted into hot water for water equipment.

[0010] According to an embodiment of the present application, the third recycling chain further comprises an upper-stage waste heat recovery device of a primary cooler and an absorption type hot water unit, wherein the gas outlet of the primary cooler in the third production chain is connected with the upper-stage waste heat recovery device of the primary cooler, and the outlet of the upper-stage waste heat recovery device of the primary cooler is connected with the absorption type hot water unit, so that the upper-stage coal gas produced by the primary cooler is converted into hot water for water equipment.

[0011] According to an embodiment of the present application, the water outlet of the primary cooler is connected with a heat pump, so that the cooling circulating water output by the primary cooler is heated into hot water for water equipment.

[0012] According to an embodiment of the present application, the second recycling chain further comprises a carbonization chamber of the first production chain and a raw coal gas sensible heat recovery device, wherein the gas outlet of the carbonization chamber is connected with the raw coal gas sensible heat recovery device, so that the raw coal gas produced by the carbonization chamber is converted into steam for steam equipment.

[0013] According to an embodiment of the present application, the waste gas outlet of the dry quenching device is connected with a waste heat boiler, so that the waste gas produced in the sensible heat process of the dry quenching device is converted into steam for steam equipment.

[0014] According to an embodiment of the present application, the first production chain is composed of a carbonization chamber, a coke pushing car, a dry quenching device and a coke airing platform which are used in sequence, so that the coking production of coal is realized.

[0015] According to the embodiment of the present application, the second production chain is composed of a combustion chamber, a heat storage chamber, an inclined channel, a flue gas purifier and a chimney used in sequence, so that the recycled gas is reused.

[0016] According to the embodiment of the present application, the third production chain is composed of a coke gas pipe, a gas-liquid separator, a primary cooler, a tar-ammonia water separator, an electric precipitator, a blower, a desulfurizer, a benzene remover and a crude benzene remover used in sequence, so that gas-liquid separation and purification are realized.

[0017] The present application has the following advantages and positive effects compared with the prior art by adopting the above technical scheme.

[0018] The coking multi-heat source step-by-step recycling equipment in the embodiment of the present application recovers waste heat from different heat sources in the coking process, such as coking red coke, flue gas, raw coal gas, coke quenching tank waste gas, circulating ammonia water, primary cooler upper section gas and cooling circulating water, converts the waste heat into various energy sources such as electricity, steam and hot water, realizes deep utilization of thermal energy in the coking process, and achieves system thermal efficiency optimization and energy saving, carbon reduction and cost reduction. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The figure is a schematic view of the coking multi-heat source step-by-step recycling equipment in the embodiment of the present application.

[0020] Figure 2 The figure is a schematic view of the coking production process in the embodiment of the present application. DETAILED DESCRIPTION

[0021] The coking multi-heat source step-by-step recycling equipment according to the present application is further described in detail below in combination with the drawings and specific embodiments.

[0022] In view of the coke oven flue gas, red coke sensible heat, raw coal gas sensible heat, coke quenching tank waste gas, circulating ammonia water, primary cooler upper section gas, cooling circulating water and other heat sources of different sources generated in the coking process, as well as different heat source requirements such as coal gas preheating, air preheating, furnace inlet coal drying, water preheating, deoxygenation steam, coking steam, regional refrigeration, pipe furnace coal gas replacement and waste heat power generation, the present embodiment provides a coking multi-heat source step-by-step recycling equipment for the purpose of reducing high-grade energy input such as external fuel of energy-using equipment and improving energy efficiency. Figure 1The coking multi-heat source step-by-step recycling equipment comprises a first recycling chain, a second recycling chain and a third recycling chain; wherein the first recycling chain comprises a first production chain, a dry quenching sensible heat recovery device and a steam turbine, the dry quenching device of the first production chain is connected with the inlet of the dry quenching sensible heat recovery device, and the outlet of the dry quenching sensible heat recovery device is connected with the gas inlet of the steam turbine, so as to convert the coking red coke produced by the dry quenching device into electric power for electric equipment. The electric equipment can be various electric equipment in the coking area.

[0023] The second recycling chain comprises a second production chain, a flue gas waste heat recovery device, the gas outlet of the flue gas purifier in the second production chain is connected with the gas inlet of the flue gas waste heat recovery device, so as to convert the flue gas output by the flue gas purifier into steam for steam equipment. If the steam equipment needs medium-pressure steam, low-pressure steam or superheated low-pressure steam, the steam equipment can be a drying device for coal entering the furnace, a tubular furnace, a coal gas preheating device and an air preheating device.

[0024] The third recycling chain comprises a third production chain, a circulating ammonia water tank, a circulating ammonia water pump and an absorption type hot water unit, the tar ammonia water separator of the third production chain is connected with the circulating ammonia water tank, the water inlet pipe of the circulating ammonia water pump is arranged in the circulating ammonia water tank, and the water outlet pipe of the circulating ammonia water pump is connected with the absorption type hot water unit, so as to convert the circulating ammonia water separated by the tar ammonia water separator into hot water for water equipment. If the water equipment needs high-temperature hot water, the water equipment can be a dry quenching waste heat boiler or a refrigeration device in the coking area.

[0025] Specifically, please refer to Figure 2 The coking production process of the embodiment comprises a first production chain composed of a coal loading vehicle P1, a carbonization chamber P2, a coke pushing vehicle P3, a dry quenching device P4 and a coke cooling platform P5; a second production chain composed of a combustion chamber P6, a heat storage chamber P7, an inclined path P8, a flue gas purification device P9 and a chimney P10; and a third production chain composed of a coke gas pipe, a gas-liquid separator, a primary cooler, a tar ammonia water separation tank, an electric precipitator P11, a blower P12, a desulfurization device P13, a benzene removal device P14 and crude benzene P15.

[0026] In the first production chain, the dry quenching device P4 produces coking red coke S1 and waste S3 in the quenching tank during the working process, and the carbonization chamber P2 produces raw coal gas S2 during the working process; in the second production chain, the flue gas purification device P9 outputs flue gas S4 after working; in the third production chain, the tar ammonia water separation tank outputs circulating ammonia water S5, and the primary cooler produces upper-stage coal gas S6 and cooling circulating water S7 during the working process.

[0027] For the different heat sources, different waste heat recovery technologies can be used to realize waste heat recovery and reuse. For example, dry quenching sensible heat recovery technology T1 can be used to convert coking red coke S1 into electricity. The raw gas sensible heat recovery technology T2 can be used to convert the sensible heat S2 of the raw gas into steam. The flue gas waste heat boiler technology T3 can be used to convert the exhaust gas S3 of the quenching tank and the coke oven flue gas S4 into steam. The circulating ammonia water waste heat recovery refrigeration (heat) technology T4 can be used to convert the circulating ammonia water waste heat S5 into hot water. The upper section of the primary cooler waste heat recovery refrigeration (heat) technology T5 can be used to convert the primary cooler upper section gas waste heat S6 into hot water. The circulating cooling water waste heat recovery heating technology T6 can be used to convert the cooling circulating water waste heat S7 into hot water.

[0028] Specifically, in the primary recycling chain of the embodiment, the coking outlet of the dry quenching device in the first production chain is in communication with the inlet of the dry quenching sensible heat recovery device, and the outlet of the dry quenching sensible heat recovery device is connected to the gas inlet of the steam turbine, realizing the conversion of the coking red coke produced by the dry quenching device into electricity for electric equipment. The exhaust gas outlet of the dry quenching device is connected to the waste heat boiler, realizing the conversion of the quenching tank exhaust gas produced in the dry quenching device into steam, which can be used for steam equipment.

[0029] In the secondary recycling chain, the gas outlet of the flue gas purifier in the second production chain is connected to the gas inlet of the flue gas waste heat recovery device, realizing the conversion of the flue gas output by the flue gas purifier into steam for steam equipment. The gas outlet of the carbonization chamber in the first production chain is connected to the raw gas sensible heat recovery device, realizing the conversion of the raw gas produced by the carbonization chamber into steam for steam equipment.

[0030] In the tertiary recycling chain, the tar ammonia water separator in the third production chain is connected to the circulating ammonia water tank, and the inlet pipe of the circulating ammonia water pump is placed in the circulating ammonia water tank. The outlet pipe of the circulating ammonia water pump is connected to the absorption type hot water unit, realizing the conversion of the circulating ammonia water separated by the tar ammonia water separator into hot water for water equipment. The gas outlet of the primary cooler in the third production chain is connected to the primary cooler upper section waste heat recovery device, and the outlet of the primary cooler upper section waste heat recovery device is connected to the absorption type hot water unit, realizing the conversion of the primary cooler upper section gas produced by the primary cooler into hot water for water equipment. The water outlet of the primary cooler is connected to the heat pump, realizing the heating of the cooling circulating water output by the primary cooler into hot water for water equipment.

[0031] The embodiment adopts electricity, steam and hot water as media, recycles various renewable energies in the coking process based on the principle of cascade utilization. Specifically, the embodiment collects various heat sources in the coking process, converts and stores them into energy forms such as electricity, steam and hot water. Through this process, the internal heat resources of the coking process are maximized and effectively stored. The recycled electricity, steam and hot water will be distributed according to the needs of various users in the coking area to meet the different needs of different process links and production equipment for energy, thereby improving energy utilization efficiency.

[0032] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments. Even if various changes are made to the utility model, provided that the changes fall within the scope of the utility model claims and equivalent technologies, they still fall within the protection scope of the utility model.

Claims

1. A multi-heat source staged recovery and utilization device for coking, characterized in that, include: Primary recycling chain, secondary recycling chain, tertiary recycling chain; The primary recycling chain includes a first production chain, a dry quenching coke sensible heat recovery unit, and a steam turbine. The coking gas outlet of the dry quenching unit in the first production chain is connected to the inlet of the dry quenching coke sensible heat recovery unit, and the outlet of the dry quenching coke sensible heat recovery unit is connected to the gas inlet of the steam turbine, so as to realize the conversion of the coking red coke produced by the dry quenching unit into electricity for use in electrical equipment. The secondary recycling chain includes a second production chain and a flue gas waste heat recovery unit. The outlet of the flue gas purifier in the second production chain is connected to the inlet of the flue gas waste heat recovery unit, so that the flue gas output by the flue gas purifier is converted into steam for use in steam-using equipment. The three-stage recycling chain includes a third production chain, a circulating ammonia tank, a circulating ammonia pump, and an absorption hot water unit. The tar-ammonia separator of the third production chain is connected to the circulating ammonia tank. The inlet pipe of the circulating ammonia pump is placed in the circulating ammonia tank, and the outlet pipe of the circulating ammonia pump is connected to the absorption hot water unit, so that the circulating ammonia separated by the tar-ammonia separator is converted into hot water for use in water-using equipment.

2. The coking multi-heat source staged recovery and utilization equipment as described in claim 1, characterized in that, The three-stage recycling chain also includes a waste heat recovery unit in the upper section of the primary cooler and an absorption hot water unit. The gas outlet of the primary cooler in the third production chain is connected to the waste heat recovery unit in the upper section of the primary cooler, and the outlet of the waste heat recovery unit in the upper section of the primary cooler is connected to the absorption hot water unit, so as to realize the conversion of the gas produced by the primary cooler into hot water for use in water-using equipment.

3. The coking multi-heat source staged recovery and utilization equipment as described in claim 2, characterized in that, The outlet of the primary cooler is connected to a heat pump, which heats the cooling circulating water output by the primary cooler into hot water for use in water-using equipment.

4. The coking multi-heat source staged recovery and utilization equipment as described in claim 1, characterized in that, The secondary recycling chain also includes a carbonization chamber and a raw coal gas sensible heat recovery unit in the first production chain. The gas outlet of the carbonization chamber is connected to the raw coal gas sensible heat recovery unit to realize the conversion of the raw coal gas produced in the carbonization chamber into steam for use in steam-using equipment.

5. The coking multi-heat source staged recovery and utilization equipment as described in claim 1, characterized in that, The exhaust gas outlet of the dry quenching device is connected to a waste heat boiler, so that the exhaust gas produced in the quenching tank during the sensible heat process of the dry quenching device is converted into steam for use in steam-consuming equipment.

6. The coking multi-heat source staged recovery and utilization equipment as described in claim 1, characterized in that, The first production chain consists of a carbonization chamber, a coke pusher, a dry quenching device, and a coke drying platform used in sequence to realize the coking production of coal.

7. The coking multi-heat source staged recovery and utilization equipment as described in claim 1, characterized in that, The second production chain consists of a combustion chamber, a heat storage chamber, an inclined duct, a flue gas purifier, and a chimney used in sequence to realize the reuse of recycled coal gas.

8. The coking multi-heat source staged recovery and utilization equipment as described in claim 1, characterized in that, The third production chain consists of a coke pipe, a gas-liquid separator, a primary cooler, a tar-ammonia-water separator, an electrostatic precipitator, a blower, a desulfurizer, a benzene remover, and a crude benzene remover used in sequence to achieve gas-liquid separation and purification.

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