Cement clinker cooler high temperature flue gas purification device and cement production system

Abstract

The present invention discloses a high-temperature flue gas purification device for a cement clinker cooler and a cement production system, in order to solve the technical problems that the purification process of the high-temperature flue gas of the existing cement clinker cooler consumes a lot of energy and water resources and the heat of the high-temperature flue gas is not utilized. The high-temperature flue gas purification device for a cement clinker cooler comprises: a gas filter dust collector unit, which is used to receive the high-temperature flue gas output by the cooler and output the dust-removed flue gas with a temperature of 250°C-500°C after physically intercepting the dust in the high-temperature flue gas through a high-temperature resistant filter element; and a waste heat boiler unit, which is used to receive the dust-removed flue gas and the first water supply and respectively output water vapor and cooled flue gas after heat exchange.

Description

Technical Field

[0001] The invention relates to the field of cement production, and in particular to a high-temperature flue gas purification device for a cement raw material mill, a high-temperature flue gas purification device for a cement clinker cooler, and a cement production system. Background Art

[0002] The existing cement production system includes three major parts: raw material production section, clinker production section and finished product production section. All three parts generate flue gas, which contains a large amount of dust and some flue gas also contains high concentration of nitrogen oxides. Therefore, these flue gases need to be purified before they can be discharged. Specifically, the raw material production section includes a raw material mill, which is used to receive cement production raw materials and high-temperature gas from the cyclone preheater and output the first flue gas. The first flue gas enters the homogenizer after the first powder recovered by the first dust collector. The clinker production section includes a burnt clinker cooler, which is used to receive the burnt clinker from the calcining equipment and cool it with air and then output the second flue gas. The second flue gas enters the clinker warehouse after the second powder recovered by the second dust collector. The finished product production section includes a powder selector, which is used to receive the powder from the ball mill and output the third flue gas containing the selected fine powder. The third powder recovered by the third dust collector enters the finished product warehouse.

[0003] There are two existing processes for purifying the first flue gas. The first process is to first pass the first flue gas into a humidifying tower, which uses water to spray and cool the high-temperature flue gas, and outputs a humid low-temperature gas (the temperature is roughly 100℃-120℃). The humid low-temperature gas then enters the first dust collector (specifically a bag dust collector) for filtration and dust removal. The first powder after filtration and dust removal enters the homogenizer, and the dust-removed flue gas is discharged. The main disadvantages of the above-mentioned first process are: a large amount of water is required for spraying and cooling, which consumes a lot of energy and water resources; the heat in the first flue gas is not utilized; the nitrogen oxide content in the first flue gas is relatively high, resulting in the nitrogen oxide emission of the dust-removed flue gas not meeting the standard; the bag dust collector has poor filtration efficiency, and dust emissions are easily exceeded. The second process is to first pass the first flue gas into the SCR (selective catalytic reduction) reactor for denitrification, and then pass it into the humidification tower. The wet low-temperature gas output from the humidification tower enters the bag filter for filtration and dust removal. The first powder after filtration and dust removal enters the homogenizer, and the dust-removed flue gas is discharged. Compared with the first process, the second process only solves the denitrification problem, but it brings derivative problems such as easy poisoning and clogging of the SCR catalyst, which not only has low denitrification efficiency, but also affects the normal operation of purification.

[0004] For the purification of the second flue gas, the existing process is similar to the first process mentioned above, so it still has the following disadvantages: a large amount of water is required for spraying and cooling, which consumes a lot of energy and water resources; the heat in the second flue gas is not utilized; the bag filter has poor filtering efficiency and dust emissions are easily exceeded. Summary of the invention

[0005] The purpose of the present invention is to provide a high-temperature flue gas purification device for a cement raw mill, a high-temperature flue gas purification device for a cement clinker cooler and a cement production system, so as to solve the technical problems that the existing purification processes for high-temperature flue gas from a cement raw mill or a cement clinker cooler consume a lot of energy and water resources and the heat of the high-temperature flue gas is not utilized.

[0006] In the first aspect, a high-temperature flue gas purification device for a cement raw mill is provided, comprising: a flue gas filtering dust collector unit, for receiving the high-temperature flue gas output by the raw mill and physically intercepting the dust in the high-temperature flue gas through a high-temperature resistant filter element to output the dust-removed flue gas with a temperature of 250°C-400°C; an SCR denitration reactor unit, for receiving the dust-removed flue gas added with an SCR denitration reducing agent and outputting the denitration flue gas after passing through an SCR denitration catalyst; a waste heat boiler unit, for receiving the denitration flue gas and feed water and performing heat exchange to output water vapor and cooled flue gas respectively; and an SCR denitration reducing agent output pipeline unit, for adding the SCR denitration reducing agent to the conveying channel of the high-temperature flue gas and / or the conveying channel of the dust-removed flue gas.

[0007] According to an embodiment of the present invention, in the cement raw mill high-temperature flue gas purification device of the first aspect above, the high-temperature resistant filter element is a filter bag, the filter bag comprises a metal filter membrane, the metal filter membrane is rolled into a tubular structure, the upper end of the tubular structure is provided with a joint and the lower end is sealed by a bottom cover, the joint is used to install the filter bag in the flue gas filtering dust collector unit.

[0008] According to an embodiment of the present invention, in the high-temperature flue gas purification device of the cement raw mill in the above-mentioned first aspect, the flue gas filter dust collector of the flue gas filter dust collector unit comprises a filter housing, an ash hopper is provided at the lower portion of the filter housing, an ash unloading device is connected to the bottom of the ash hopper, a perforated plate is provided in the filter housing, a high-temperature resistant filter element is installed on the perforated plate, the perforated plate and the high-temperature resistant filter element separate the filter housing into a lower original air chamber and an upper clean air chamber, the high-temperature resistant filter element is located in the lower original air chamber, and the SCR denitrification reducing agent output pipeline unit is arranged in the upper clean air chamber.

[0009] According to an embodiment of the present invention, in the cement raw mill high-temperature flue gas purification device of the first aspect, the heat pipes in the waste heat boiler unit are finned heat exchange tubes.

[0010] According to an embodiment of the present invention, in the cement raw mill high-temperature flue gas purification device of the first aspect, the SCR denitration reactor unit is assembled on the flue gas filtration and dust removal unit to form an integrated dust removal and denitration device.

[0011] According to an embodiment of the present invention, in the cement raw mill high-temperature flue gas purification device of the first aspect above, the waste heat boiler unit is assembled on the dust removal and denitrification integrated equipment to form a dust removal, denitrification and heat exchange integrated equipment.

[0012] According to an embodiment of the present invention, in the high-temperature flue gas purification device of the cement raw mill of the first aspect above, the flue gas filter dust collector of the flue gas filter dust collector unit comprises a filter housing, an ash hopper is provided at the lower part of the filter housing, an ash unloading device is connected to the bottom of the ash hopper, a perforated plate is provided in the filter housing, a high-temperature resistant filter element is installed on the perforated plate, the perforated plate and the high-temperature resistant filter element separate the filter housing into a lower original air chamber and an upper clean air chamber, and the high-temperature resistant filter element is located in the lower original air chamber; the SCR denitration reactor unit comprises a reactor housing, the reactor housing is used to install the SCR denitration catalyst, the reactor housing is connected to the filter housing as a whole, the reactor housing is communicated with the upper clean air chamber and is composed of the shell of the upper clean air chamber or is located at the top and / or side of the upper clean air chamber.

[0013] According to an embodiment of the present invention, in the cement raw mill high-temperature flue gas purification device of the first aspect above, when the waste heat boiler unit is assembled on the integrated dust removal and denitrification equipment, the flue of the waste heat boiler unit is arranged vertically or horizontally and is located on the top and / or side of the reactor shell.

[0014] According to an embodiment of the present invention, in the high-temperature flue gas purification device of a cement raw meal mill of the first aspect mentioned above, the flue gas filter dust collector unit includes a left-side flue gas filter dust collector and a right-side flue gas filter dust collector arranged in parallel along the left-right direction, and the left-side flue gas filter dust collector and the right-side flue gas filter dust collector respectively have at least one flue gas filter dust collector arranged along the front-to-back direction, and an air intake main flue is arranged between the left-side flue gas filter dust collector and the right-side flue gas filter dust collector, and the air intake main flue is respectively connected to the lower original air chamber of each of the flue gas filter dust collectors in the flue gas filter dust collector unit; the length of the tube bundle in the waste heat boiler unit and the left-right width of the flue gas filter dust collector unit are set in the same direction.

[0015] In a second aspect, a cement production system is provided, comprising: a raw material production section, the raw material production section comprising a raw material mill, the raw material mill is used to receive cement production raw materials and high-temperature gas from a cyclone preheater and output a first flue gas, the first flue gas is fed into a homogenizer through a first dust collector to recover a first powder; a clinker production section, the clinker production section comprising a burnt clinker cooler, the burnt clinker cooler is used to receive burnt clinker from a calcining device and cool it with air before outputting a second flue gas, the second flue gas is fed into a clinker storage through a second dust collector to recover a second powder; a finished product production section The finished product production section includes a powder classifier, which is used to receive powder from the ball mill and output a third flue gas containing selected fine powder. The third powder recovered by the third flue gas through the third dust collector enters the finished product warehouse; the first dust collector adopts the cement raw mill high-temperature flue gas purification device of the first aspect above, wherein the first flue gas enters the cement raw mill high-temperature flue gas purification device as the high-temperature flue gas output by the raw mill, and the dust filtered by the flue gas filter dust collector unit of the cement raw mill high-temperature flue gas purification device enters the homogenizer as the first powder, and the cooled flue gas is discharged.

[0016] The above-mentioned cement raw mill high-temperature flue gas purification device first filters and dedusts the high-temperature flue gas output by the raw mill through the flue gas filter and dust collector unit, and then adjusts the high-temperature flue gas to dust-removed flue gas, and then denitrates the dust-removed flue gas through the SCR denitrification reactor unit to obtain denitrified flue gas, and finally adjusts the denitrified flue gas to cooled flue gas through the waste heat boiler unit.

[0017] The output temperature of the flue gas filter dust collector unit is 250℃-400℃ for the dust-removed flue gas. This temperature range does not affect the service life of the high-temperature filter element in the flue gas filter dust collector unit; at the same time, it can also keep the temperature of the dust-removed flue gas within the optimal operating temperature range of the current more technically mature high-temperature SCR denitration catalyst to ensure the denitration effect. In addition, dust removal before denitration can prevent the SCR denitration catalyst from being blocked by dust and prevent catalyst poisoning.

[0018] The heat of the high-temperature flue gas can be fully recovered through the waste heat boiler unit, especially the denitrified flue gas entering the waste heat boiler unit has a low dust content. Therefore, the heat exchange efficiency between the denitrified flue gas and the tube bundle in the waste heat boiler unit is relatively high, thereby improving the heat exchange efficiency of the waste heat boiler unit and reducing the impact of dust on the waste heat boiler unit.

[0019] According to a third aspect, a high-temperature flue gas purification device for a cement clinker cooler is provided, comprising: a flue gas filtering dust collector unit, for receiving the high-temperature flue gas output by the cooler and physically intercepting the dust in the high-temperature flue gas through a high-temperature resistant filter element to output dust-removed flue gas with a temperature of 250°C-500°C, preferably 300°C-500°C; and a waste heat boiler unit, for receiving the denitrified flue gas and the first water supply and performing heat exchange to output water vapor and cooled flue gas respectively.

[0020] According to an embodiment of the present invention, the high-temperature flue gas purification device of the cement clinker cooler in the third aspect mentioned above also includes a water preheating unit, which is used to receive the high-temperature dust and the second water supply discharged by the flue gas filter dust collector unit and heat the second water supply by the high-temperature dust to output the first water supply formed by heating the second water supply.

[0021] According to an embodiment of the present invention, in the high-temperature flue gas purification device of the cement clinker cooler in the third aspect above, the high-temperature resistant filter element is a filter bag, the filter bag comprises a metal filter membrane, the metal filter membrane is rolled into a tubular structure, the upper end of the tubular structure is provided with a joint and the lower end is sealed by a bottom cover, the joint is used to install the filter bag in the flue gas filtering dust collector unit.

[0022] According to an embodiment of the present invention, in the high-temperature flue gas purification device of the cement clinker cooler of the third aspect above, the flue gas filter dust collector of the flue gas filter dust collector unit comprises a filter housing, an ash hopper is provided at the lower portion of the filter housing, an ash unloading device is connected to the bottom of the ash hopper, a perforated plate is provided in the filter housing, a high-temperature resistant filter element is installed on the perforated plate, the perforated plate and the high-temperature resistant filter element separate the filter housing into a lower original air chamber and an upper clean air chamber, and the high-temperature resistant filter element is located in the lower original air chamber.

[0023] According to an embodiment of the present invention, the high-temperature flue gas purification device of the cement clinker cooler in the third aspect mentioned above also includes a pre-waste heat boiler unit, which is used to receive the high-temperature flue gas output by the cooler and the third water supply and output water vapor and the cooled high-temperature flue gas respectively after heat exchange; the flue gas filtering dust collector unit is used to receive the high-temperature flue gas output by the pre-waste heat boiler unit and physically intercept the dust in the high-temperature flue gas through a high-temperature resistant filter element, and then output the dust-removed flue gas with a temperature of 250℃-500℃.

[0024] According to an embodiment of the present invention, in the high-temperature flue gas purification device of the cement clinker cooler of the third aspect above, the shell of the flue constituting the flue of the waste heat boiler unit and the shell of the flue constituting the pre-waste heat boiler unit are assembled with each other to make the waste heat boiler unit and the pre-waste heat boiler unit an integrated heat exchange device, and an air supply flue and a return flue are distributed on the periphery of the integrated heat exchange device; the flue gas filter dust collector unit is arranged on the side of the integrated heat exchange device, and the integrated heat exchange device connects the exhaust port of the flue of the pre-waste heat boiler unit with the air inlet of the flue of the flue of the flue through the air supply flue, and the integrated heat exchange device connects the air inlet of the flue of the waste heat boiler unit with the exhaust port of the flue of the flue of the flue of the flue of the waste heat boiler unit through the return flue.

[0025] According to an embodiment of the present invention, in the high-temperature flue gas purification device of the cement clinker cooler of the third aspect above, the flue of the pre-waste heat boiler unit is vertically arranged, and the air inlet and exhaust port of the pre-waste heat boiler unit are distributed at the lower and upper parts of the flue of the pre-waste heat boiler unit; an ash hopper is provided at the lower part of the flue of the pre-waste heat boiler unit, and an ash unloading mechanism is connected to the bottom of the ash hopper; the flue of the waste heat boiler unit is vertically arranged, and the air inlet and exhaust port of the waste heat boiler unit are distributed at the upper and lower parts of the flue of the waste heat boiler unit; the exhaust port of the flue of the pre-waste heat boiler unit is connected to the air inlet of the flue of the waste heat boiler unit so that the pre-waste heat boiler unit and the waste heat boiler unit form an inverted U-shaped structure.

[0026] According to an embodiment of the present invention, in the high-temperature flue gas purification device of the cement clinker cooler in the third aspect above, the heat exchange tubes in at least the waste heat boiler unit among the pre-waste heat boiler unit and the waste heat boiler unit adopt finned heat exchange tubes, and when the heat exchange tubes in the pre-waste heat boiler unit do not adopt finned heat exchange tubes, smooth heat exchange tubes are adopted.

[0027] According to an embodiment of the present invention, in the high-temperature flue gas purification device of the cement clinker cooler of the third aspect above, the pre-waste heat boiler unit includes a first superheater, a first evaporator and a first economizer arranged in sequence from front to back along the flue of the pre-waste heat boiler unit; the waste heat boiler unit includes a second evaporator and a second economizer arranged in sequence from front to back along the flue of the waste heat boiler unit; the steam outlet of the steam drum corresponding to the connected second evaporator is connected to the steam inlet of the first superheater through a steam delivery pipe.

[0028] According to an embodiment of the present invention, in the high-temperature flue gas purification device of the cement clinker cooler in the third aspect, the waste heat boiler unit is assembled on the flue gas filtering and dust collecting unit to form an integrated dust removal and heat exchange device.

[0029] According to an embodiment of the present invention, in the high-temperature flue gas purification device of the cement clinker cooler in the third aspect above, the flue gas filter dust collector of the flue gas filter dust collector unit comprises a filter housing, an ash hopper is provided at the lower portion of the filter housing, an ash unloading device is connected to the bottom of the ash hopper, a perforated plate is provided in the filter housing, a high-temperature resistant filter element is installed on the perforated plate, the perforated plate and the high-temperature resistant filter element separate the filter housing into a lower original air chamber and an upper clean air chamber, and the high-temperature resistant filter element is located in the lower original air chamber; the flue of the waste heat boiler unit is vertically or horizontally arranged and is located at the top and / or side of the filter housing.

[0030] According to an embodiment of the present invention, in the high-temperature flue gas purification device of the cement clinker cooler of the third aspect above, the flue gas filter dust collector unit includes a left-side flue gas filter dust collector and a right-side flue gas filter dust collector arranged in parallel along the left-right direction, and the left-side flue gas filter dust collector and the right-side flue gas filter dust collector respectively have at least one flue gas filter dust collector arranged along the front-to-back direction, and an air intake main flue is arranged between the left-side flue gas filter dust collector and the right-side flue gas filter dust collector, and the air intake main flue is respectively connected to the lower original air chamber of each of the flue gas filter dust collectors in the flue gas filter dust collector unit; the length of the tube bundle in the waste heat boiler unit and the left-right width of the flue gas filter dust collector unit are set in the same direction.

[0031] In a fourth aspect, a cement production system is provided, comprising: a raw material production section, the raw material production section comprising a raw material mill, the raw material mill is used to receive cement production raw materials and high-temperature gas from a cyclone preheater and output a first flue gas, the first flue gas is fed into a homogenizer through a first dust collector to recover a first powder; a clinker production section, the clinker production section comprising a burnt clinker cooler, the burnt clinker cooler is used to receive burnt clinker from a calcining device and cool it with air before outputting a second flue gas, the second flue gas is fed into a clinker storage through a second dust collector to recover a second powder; a finished product production section, the finished product production section comprising a burnt clinker cooler, the burnt clinker cooler is used to receive burnt clinker from a calcining device and cool it with air before outputting a second flue gas, the second flue gas is fed into a clinker storage through a second dust collector to recover a second powder; The production section includes a powder classifier, which is used to receive powder from the ball mill and output a third flue gas containing selected fine powder. The third powder recovered by the third flue gas through the third dust collector enters the finished product warehouse; the second dust collector adopts the high-temperature flue gas purification device of the cement clinker cooler of the third aspect above, wherein the second flue gas enters the high-temperature flue gas purification device of the cement clinker cooler as the high-temperature flue gas output by the cooler, and the dust filtered by the flue gas filtration dust collector unit of the high-temperature flue gas purification device of the cement clinker cooler enters the clinker warehouse as the second powder, and the cooled flue gas is discharged.

[0032] According to an embodiment of the present invention, in the cement production system of the fourth aspect, the first dust collector adopts a cement raw mill high-temperature flue gas purification device, and the cement raw mill high-temperature flue gas purification device includes: a flue gas filtering dust collector unit, which is used to receive the high-temperature flue gas output by the raw mill and physically intercept the dust in the high-temperature flue gas through a high-temperature resistant filter element and output the dust-removed flue gas with a temperature of 250°C-400°C; an SCR denitrification reactor unit, which is used to receive the dust-removed flue gas added with an SCR denitrification reductant and output the denitrified flue gas after passing through an SCR denitrification catalyst ; a waste heat boiler unit, used for receiving the denitrified flue gas and feed water and outputting water vapor and cooled flue gas respectively after heat exchange; and an SCR denitrification reducing agent output pipeline unit, used for adding the SCR denitrification reducing agent to the conveying channel of the high-temperature flue gas and / or the conveying channel of the dust-removed flue gas; wherein, the first flue gas enters the cement raw mill high-temperature flue gas purification device as the high-temperature flue gas output by the raw mill, and the dust filtered by the flue gas filter dust collector unit of the cement raw mill high-temperature flue gas purification device enters the homogenizer as the first powder, and the cooled flue gas is discharged.

[0033] According to an embodiment of the present invention, in the cement production system of the fourth aspect above, in the cement raw mill high-temperature flue gas purification device, the SCR denitrification reactor unit is assembled on the flue gas filtration and dust collector unit to form an integrated dust removal and denitrification equipment, and the waste heat boiler unit is assembled on the integrated dust removal and denitrification equipment to form an integrated dust removal and denitrification heat exchange equipment.

[0034] The above-mentioned cement clinker cooler high-temperature flue gas purification device first filters and dedusts the high-temperature flue gas output by the cement clinker cooler through a flue gas filter and dust collector unit, and then adjusts the high-temperature flue gas to dust-removed flue gas, and then adjusts the dust-removed flue gas to cooled flue gas through a waste heat boiler unit.

[0035] The output temperature of the flue gas filter dust collector unit is 250℃-500℃ for dust-removed flue gas, and this temperature range does not affect the service life of the high-temperature filter element in the flue gas filter dust collector unit. The heat of the high-temperature flue gas can be fully recovered through the waste heat boiler unit, especially the denitrified flue gas entering the waste heat boiler unit has a small dust content. Therefore, the heat exchange efficiency between the denitrified flue gas and the tube bundle in the waste heat boiler unit is high, so the heat exchange efficiency of the waste heat boiler unit can be improved and the impact of dust on the waste heat boiler unit can be reduced.

[0036] The present application is further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages of the present application will be partially given in the following description, partially become apparent from the following description, or be understood through practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings constituting a part of this specification are used to assist in the understanding of the present application. The contents provided in the drawings and the related descriptions in this specification may be used to explain the present application, but shall not constitute an improper limitation on the present application.

[0038] Figure 1 The present invention is a schematic structural diagram of a high-temperature flue gas purification device for a cement raw mill according to an embodiment of the present invention.

[0039] Figure 2 This is a schematic diagram of a high-temperature flue gas purification device for a cement clinker cooler according to an embodiment of the present invention.

[0040] Figure 3 The present invention is a schematic structural diagram of a high-temperature flue gas purification device for a cement raw mill according to an embodiment of the present invention.

[0041] Figure 4 for Figure 3 The left view of the cement raw mill high temperature flue gas purification device is shown.

[0042] Figure 5 The present invention is a schematic structural diagram of a high-temperature flue gas purification device for a cement raw mill according to an embodiment of the present invention.

[0043] Figure 6 The present invention is a schematic structural diagram of a high-temperature flue gas purification device for a cement raw mill according to an embodiment of the present invention.

[0044] Figure 7 This is a schematic diagram of the partial structure of a high-temperature flue gas purification device for a cement clinker cooler according to an embodiment of the present invention.

[0045] Figure 3-7 The direction indicated by the hollow arrow in the figure represents the flow direction of the flue gas. DETAILED DESCRIPTION

[0046] The present application is described clearly and completely below in conjunction with the accompanying drawings. A person of ordinary skill in the art will be able to implement the present application based on these descriptions. Before describing the present application in conjunction with the accompanying drawings, it should be noted that:

[0047] The technical solutions and technical features provided in each section, including the following description, can be combined with each other without conflict. In addition, where possible, these technical solutions, technical features and related combinations can be assigned specific technical themes and protected by relevant patents.

[0048] The embodiments of the present application involved in the following description are generally only a part of the embodiments rather than all the embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of patent protection.

[0049] About the terms and units in this specification: The terms "including", "comprising", "having" and any variations thereof in this specification, the corresponding claims and related parts are intended to cover non-exclusive inclusions. In addition, other relevant terms and units can be reasonably interpreted based on the relevant content provided in this specification. The terms "front", "rear", "left" and "right" in this specification, the corresponding claims and related parts represent relative positional relationships based on the drawings. In addition, other relevant terms and units can be reasonably interpreted based on the relevant content provided in this specification.

[0050] like Figure 1-2 As shown, the existing cement production system includes a raw material production section and a clinker production section, wherein the raw material production section includes a raw material mill 11, which is used to receive cement production raw materials and high-temperature gas from a cyclone preheater 21 and output a first flue gas, and the first flue gas enters a homogenizer 16 after the first powder is recovered by a first dust collector. The clinker production section includes a clinker cooler 29 (usually a grate cooler), which is used to receive clinker from a calcining device 22 (usually a rotary kiln) and cool it with air before outputting a second flue gas, and the second flue gas enters a clinker storage after the second powder is recovered by a second dust collector.

[0051] There are two existing processes for purifying the first flue gas. The first process is to first pass the first flue gas into a humidifying tower, which uses water to spray and cool the high-temperature flue gas, and outputs a humid low-temperature gas (the temperature is roughly 100℃-120℃). The humid low-temperature gas then enters the first dust collector (specifically a bag dust collector) for filtration and dust removal. The first powder after filtration and dust removal enters the homogenizer, and the dust-removed flue gas is discharged. The main disadvantages of the above-mentioned first process are: a large amount of water is required for spraying and cooling, which consumes a lot of energy and water resources; the heat in the first flue gas is not utilized; the nitrogen oxide content in the first flue gas is relatively high, resulting in the nitrogen oxide emission of the dust-removed flue gas not meeting the standard; the bag dust collector has poor filtration efficiency, and dust emissions are easily exceeded. The second process is to first pass the first flue gas into the SCR (selective catalytic reduction) reactor for denitrification, and then pass it into the humidification tower. The wet low-temperature gas output from the humidification tower enters the bag filter for filtration and dust removal. The first powder after filtration and dust removal enters the homogenizer, and the dust-removed flue gas is discharged. Compared with the first process, the second process only solves the denitrification problem, but it brings derivative problems such as easy poisoning and clogging of the SCR catalyst, which not only has low denitrification efficiency, but also affects the normal operation of purification.

[0052] For the purification of the second flue gas, the existing process is similar to the first process mentioned above, so it still has the following disadvantages: a large amount of water is required for spraying and cooling, which consumes a lot of energy and water resources; the heat in the second flue gas is not utilized; the bag filter has poor filtering efficiency and dust emissions are easily exceeded.

[0053] Figure 1 The following is a schematic diagram of the structure of a high-temperature flue gas purification device for a cement raw mill according to an embodiment of the present invention. Figure 1 As shown, the cement raw mill high-temperature flue gas purification device includes: a flue gas filter dust collector unit 12, an SCR denitration reactor unit 13, a waste heat boiler unit 14 and an SCR denitration reducing agent output pipeline unit.

[0054] The flue gas filter dust collector unit 12 is used to receive the high-temperature flue gas (first flue gas) output by the raw mill 11 and physically intercept the dust in the high-temperature flue gas through a high-temperature filter element to output dust-removed flue gas with a temperature of 250° C.-400° C. The dust after filtration and dust removal enters the homogenizer 16 .

[0055] The SCR denitration reactor unit 13 is used to receive the denitrated flue gas to which the SCR denitration reducing agent (such as liquid ammonia, urea, ammonia water, etc.) is added and output the denitrated flue gas after passing through the SCR denitration catalyst. The SCR denitration reactor unit 13 can be assembled on the flue gas filter dust collector unit 12 to form a dust removal and denitration integrated device.

[0056] The waste heat boiler unit 14 is used to receive the denitrified flue gas and feed water and output water vapor and cooled flue gas respectively after heat exchange. The cooled flue gas passes through the fan 19 and is discharged through the chimney 20. The water vapor can be input into the steam turbine for power generation. The heat pipes in the waste heat boiler unit 14 are preferably finned heat exchange tubes.

[0057] The SCR denitration reducing agent output pipeline unit is used to add the SCR denitration reducing agent into the conveying channel of the high-temperature flue gas and / or the conveying channel of the dust-removed flue gas.

[0058] The above-mentioned cement raw mill high-temperature flue gas purification device first filters and dedusts the high-temperature flue gas output by the raw mill through the flue gas filter dust collector unit 12, and then adjusts the high-temperature flue gas to dust-removed flue gas, and then denitrates the dust-removed flue gas through the SCR denitrification reactor unit 13 to obtain denitrified flue gas, and finally adjusts the denitrified flue gas to cooled flue gas through the waste heat boiler unit 14.

[0059] The output temperature of the flue gas filter dust collector unit 12 is 250℃-400℃ for the dust-removed flue gas, and this temperature range does not affect the service life of the high temperature resistant filter element in the flue gas filter dust collector unit 12; at the same time, the temperature of the dust-removed flue gas can be maintained within the preferred operating temperature range of the more technically mature high-temperature SCR denitration catalyst (for example, SCR denitration catalyst with TiO2 as carrier, V2O5 and WO3 as active ingredients) to ensure the denitration effect. In addition, dust removal before denitration can prevent the SCR denitration catalyst from being blocked by dust and prevent catalyst poisoning.

[0060] The heat of the high-temperature flue gas can be fully recovered and utilized through the waste heat boiler unit 14, especially the denitrified flue gas entering the waste heat boiler unit 14 has a small dust content. Therefore, the heat exchange efficiency between the denitrified flue gas and the tube bundle in the waste heat boiler unit 14 is relatively high, thereby improving the heat exchange efficiency of the waste heat boiler unit and reducing the impact of dust on the waste heat boiler unit 14.

[0061] Figure 3 The present invention is a schematic structural diagram of a high-temperature flue gas purification device for a cement raw mill according to an embodiment of the present invention. Figure 4 for Figure 3 The left side view of the high temperature flue gas purification device of cement raw mill is shown in the figure. Figure 3-4 As shown, a high-temperature flue gas purification device for a cement raw mill comprises: a flue gas filtering and dust collecting unit 12, which is used to receive the high-temperature flue gas (first flue gas) output by the raw mill 11 and output the dust-removed flue gas with a temperature of 250°C-400°C after physically intercepting the dust in the high-temperature flue gas through a high-temperature resistant filter element; an SCR denitration reactor unit 13, which is used to receive the dust-removed flue gas added with an SCR denitration reducing agent and output the denitration flue gas after passing through an SCR denitration catalyst 132; a waste heat boiler unit 17, which is used to receive the denitration flue gas and feed water and output water vapor and cooled flue gas respectively after heat exchange; the SCR denitration reactor unit 13 and the waste heat boiler unit 17 are respectively assembled on the flue gas filtering and dust collecting unit 12 to form a dust removal, denitration and heat exchange integrated equipment.

[0062] The waste heat boiler unit 17 has the same function as the second waste heat boiler unit 14. Compared with the above-mentioned dust removal and denitration integrated equipment, the above-mentioned dust removal and denitration heat exchange integrated equipment can further reduce the heat loss in the process from flue gas denitration to flue gas heat exchange, and improve the waste heat utilization efficiency.

[0063] The flue gas filter dust collector of the flue gas filter dust collector unit 12 includes a filter housing 122, a ash hopper 123 is provided at the lower part of the filter housing 122, and a ash unloading device is connected to the bottom of the ash hopper 123. A perforated plate is provided in the filter housing 122, and a filter element 121 is installed on the perforated plate. The perforated plate and the filter element 121 separate the filter housing 122 into a lower original air chamber 124 and an upper clean air chamber 125, and the filter element 121 is located in the lower original air chamber 124.

[0064] The filter element 121 is preferably a filter bag, which includes a metal filter membrane, and the metal filter membrane is rolled into a tubular structure. The upper end of the tubular structure is provided with a joint and the lower end is sealed by a bottom cover, and the joint is used to install the filter bag in the flue gas filter dust collector unit 12. Compared with traditional high-temperature resistant ceramic filter elements, the above-mentioned filter bag has a lower cost and good high-temperature resistance. In addition, the metal filter membrane can be rolled into a tubular structure, which means that the metal filter membrane is thin, which helps to ensure the filtration flux. The metal filter membrane has high filtration efficiency and long practical life, and can achieve dust emission standards.

[0065] The SCR denitration reactor unit 13 includes a reactor shell 131, in which the SCR denitration catalyst 132 is installed. The reactor shell 131 is integrally connected to the filter shell 122. The reactor shell 131 is connected to the upper clean air chamber 125 and is composed of the shell of the upper clean air chamber 125 or is located at the top of the upper clean air chamber.

[0066] The flue 171 of the waste heat boiler unit 17 is vertically arranged and located on the top of the reactor shell 131 and communicated with the reactor shell 131 .

[0067] The flue gas filter dust collector unit 12 also includes a left flue gas filter dust collector 12A and a right flue gas filter dust collector 12B arranged in parallel along the left and right directions, and the left flue gas filter dust collector 12A and the right flue gas filter dust collector 12B each have at least one flue gas filter dust collector arranged along the front-back direction. An intake main flue 126 is arranged between the left flue gas filter dust collector and the right flue gas filter dust collector, and the intake main flue 126 is respectively connected to the lower original air chamber 124 of each of the flue gas filter dust collectors in the flue gas filter dust collector unit 12. In addition, an exhaust main flue 127 can also be arranged between the left flue gas filter dust collector 12A and the right flue gas filter dust collector 12B, and the exhaust main flue 127 can be located above the intake main flue 126, and the exhaust main flue 127 is respectively connected to the upper clean air chamber 125 of each of the flue gas filter dust collectors in the flue gas filter dust collector unit 12. When the flue gas filter dust collector unit 12 includes a plurality of flue gas filter dust collectors, the plurality of flue gas filter dust collectors are arranged in the above arrangement manner, so that the structure of the flue gas filter dust collector unit 12 can be more reasonable.

[0068] Since the main air intake flue 126 and the main exhaust flue 127 are located between the left flue gas filter dust collector 12A and the right flue gas filter dust collector 12B, the left-right width of the flue gas filter dust collector unit 12 is increased. At this time, the length of the tube bundle in the waste heat boiler unit 17 (the tube bundle of the evaporator, economizer and other heat exchange equipment) can be set in the same direction as the left-right width of the flue gas filter dust collector unit 12, thereby ensuring a larger heat exchange area.

[0069] An exhaust channel 128 is opened at the top of the exhaust main flue 127, and the reactor shell 131 is arranged at the top of the exhaust channel 128 and communicates with the exhaust main flue 127 through the exhaust channel 128. In this way, the dust-removed flue gas entering the exhaust main flue 127 can enter the reactor shell 131 from the exhaust channel 128.

[0070] The reactor shell 131 is arranged directly above the exhaust main flue 127 as a whole and the left-right width of the reactor shell 131 is smaller than the left-right width of the flue gas filter dust collector unit 12. In this way, an operating space can be formed on both sides of the reactor shell 131 at the top of the flue gas filter dust collector unit 12 to facilitate the installation and replacement of the SCR denitration catalyst 132.

[0071] The top of the reactor shell 131 is also provided with a guide flue 133, and the flue 171 of the waste heat boiler unit 17 is vertically arranged at the top of the guide flue 133 and communicates with the reactor shell 131 through the guide flue 133. The left-right width of the flue 171 of the waste heat boiler unit 17 is consistent with the left-right width of the flue gas filter dust collector unit 12, and the left-right width of the guide flue 133 is also consistent with the left-right width of the flue gas filter dust collector unit 12. In this way, the guide flue 133 can fully buffer the denitrified flue gas that is about to enter the flue 171 of the waste heat boiler unit 17, so that the flow field in the flue 171 of the waste heat boiler unit 17 is more uniform.

[0072] Figure 5 The following is a schematic diagram of the structure of a high-temperature flue gas purification device for a cement raw mill according to an embodiment of the present invention. Figure 5 As shown, the device of this embodiment is compared with Figure 3-4 The difference between the devices shown is that the flue 171 of the waste heat boiler unit 17 is arranged on the side of the reactor shell 131, and at the same time, the flue 171 of the waste heat boiler unit 17 is vertically arranged on the side of the guide flue 133. As a result, the overall height of the dust removal, denitration and heat exchange integrated equipment is reduced.

[0073] Figure 6 The following is a schematic diagram of the structure of a high-temperature flue gas purification device for a cement raw mill according to an embodiment of the present invention. Figure 6 As shown, the device of this embodiment is compared with Figure 3-4 The difference between the devices shown is that the reactor housing 131 is arranged directly above the front section of the exhaust main flue 127 and the front-to-back length of the reactor housing 131 is less than the front-to-back length of the flue gas filter dust collector unit 12, and the flue 171 of the waste heat boiler unit 17 is transversely arranged between the top of the flue gas filter dust collector unit 12 and the side of the SCR denitration reactor unit 13. This helps to ensure that the overall height and front-to-back length of the dust removal, denitration and heat exchange integrated equipment are not too large.

[0074] Figure 2 This is a schematic diagram of a high-temperature flue gas purification device for a cement clinker cooler according to an embodiment of the present invention. Figure 2 As shown, the high-temperature flue gas purification device of the cement clinker cooler includes: a flue gas filtering dust collector unit 23 and a waste heat boiler unit 24.

[0075] The flue gas filtering and dust collecting unit is used to receive the high-temperature flue gas (second flue gas) output by the clinker cooler 29 and physically intercept the dust in the high-temperature flue gas through a high-temperature resistant filter element to output dust-removed flue gas with a temperature of 250°C-500°C, preferably 300°C-500°C (such as 350°C, 400°C).

[0076] The waste heat boiler unit 24 is used to receive the dust-removed flue gas and the first feed water and respectively output water vapor and cooled flue gas after heat exchange. The cooled flue gas passes through the fan 27 and is discharged through the chimney 28.

[0077] The above-mentioned cement clinker cooler high-temperature flue gas purification device first filters and dedusts the high-temperature flue gas output by the clinker cooler 29 through the flue gas filter dust collector unit 23, and then adjusts the high-temperature flue gas to dust-removed flue gas, and then adjusts the dust-removed flue gas to cooled flue gas through the waste heat boiler unit 24.

[0078] The flue gas filter dust collector unit 23 outputs dust-removed flue gas at a temperature of 250°C-500°C, and this temperature range does not affect the service life of the high-temperature resistant filter element in the flue gas filter dust collector unit.

[0079] Optionally, in the high-temperature flue gas purification device of the cement clinker cooler, the high-temperature resistant filter element is a filter bag, the filter bag comprises a metal filter membrane, the metal filter membrane is rolled into a tubular structure, the upper end of the tubular structure is provided with a joint and the lower end is sealed by a bottom cover, the joint is used to install the filter bag in the flue gas filter dust collector unit 23. The metal filter membrane has high filtering efficiency and long practical life, and can achieve dust emission that meets standards.

[0080] The heat of the high-temperature flue gas can be fully recovered through the waste heat boiler unit 24, especially the denitrified flue gas entering the waste heat boiler unit 24 has a small dust content. Therefore, the heat exchange efficiency between the denitrified flue gas and the tube bundle in the waste heat boiler unit 24 is relatively high, thereby improving the heat exchange efficiency of the waste heat boiler unit 24 and reducing the impact of dust on the waste heat boiler unit 24.

[0081] Optionally, the high-temperature flue gas purification device of the cement clinker cooler further includes a feed water preheating unit 25, which is used to receive the high-temperature dust and the second feed water discharged by the flue gas filter dust collector unit 23 and heat the second feed water by the high-temperature dust to output the first feed water formed by heating the second feed water. The dust after heat exchange enters the clinker storage 26. The first feed water after heat exchange enters the waste heat boiler unit 24. Thus, the first feed water can be preheated by using the high-temperature dust discharged by the flue gas filter dust collector unit 23.

[0082] The water preheating unit 25 can adopt a structure similar to a partition heat exchanger, in which there are a high-temperature dust conveying channel and a water conveying flux. Heat is transferred between these two channels through a heat transfer wall, thereby realizing the function of preheating the first water supply using the high-temperature dust discharged from the flue gas filter dust collector unit 23.

[0083] The clinker cooler 29 is usually a grate cooler. By adjusting the operating parameters of the grate cooler, the flue gas temperature output by the grate cooler can be greatly changed. For example, the flue gas temperature output by the grate cooler can be made higher, such as 600°C. At this time, the high-temperature flue gas purification device of the cement clinker cooler can also include a pre-waste heat boiler unit for receiving the high-temperature flue gas output by the clinker cooler 29 and the third water supply and outputting water vapor and the cooled high-temperature flue gas respectively after heat exchange; the flue gas filter dust collector unit 23 is used to receive the high-temperature flue gas output by the pre-waste heat boiler unit and physically intercept the dust in the high-temperature flue gas through a high-temperature resistant filter element, and then output the dust-removed flue gas with a temperature of 250°C-500°C. In this way, the waste heat of the high-temperature flue gas output by the clinker cooler 29 can be more fully utilized.

[0084] Figure 7 This is a partial structural diagram of a high-temperature flue gas purification device for a cement clinker cooler according to an embodiment of the present invention. Figure 7 As shown, the shell of the flue constituting the waste heat boiler unit 24 and the shell of the flue constituting the pre-waste heat boiler unit are assembled with each other so that the waste heat boiler unit and the pre-waste heat boiler unit become an integrated heat exchange device, and an air supply flue and a return flue are distributed on the periphery of the integrated heat exchange device; the flue gas filter dust collector unit 23 is arranged on the side of the integrated heat exchange device, and the integrated heat exchange device connects the exhaust port of the flue of the pre-waste heat boiler unit with the air inlet of the flue of the flue through the air supply flue, and the integrated heat exchange device connects the air inlet of the flue of the waste heat boiler unit 24 with the exhaust port of the flue of the flue of the flue filter dust collector unit 12 through the return flue.

[0085] Specifically, the flue of the pre-heated waste heat boiler unit is arranged vertically, and the air inlet and exhaust port of the pre-heated waste heat boiler unit are distributed at the lower part and the upper part of the flue of the pre-heated waste heat boiler unit. An ash hopper is provided at the lower part of the flue of the pre-heated waste heat boiler unit, and an ash unloading mechanism is connected to the bottom of the ash hopper; the flue of the waste heat boiler unit 24 is arranged vertically, and the air inlet and exhaust port of the waste heat boiler unit are distributed at the upper part and the lower part of the flue of the waste heat boiler unit; the exhaust port of the flue of the pre-heated waste heat boiler unit is connected with the air inlet of the flue of the waste heat boiler unit so that the pre-heated waste heat boiler unit and the waste heat boiler unit form an inverted U-shaped structure (such as Figure 7 ). The integrated heat exchange equipment has a compact structure, which can save the overall floor space and facilitate dust discharge.

[0086] In addition, the heat exchange tubes in at least the waste heat boiler unit of the pre-heat waste heat boiler unit and the waste heat boiler unit are finned heat exchange tubes, and when the heat exchange tubes in the pre-heat waste heat boiler unit are not finned heat exchange tubes, smooth heat exchange tubes are used.

[0087] In addition, the pre-waste heat boiler unit includes a first superheater 111, a first evaporator 112 and a first economizer 113 arranged in sequence from front to back along the flue of the pre-waste heat boiler unit; the waste heat boiler unit 24 includes a second evaporator 142 and a second economizer 141 arranged in sequence from front to back along the flue of the waste heat boiler unit; the steam outlet of the steam drum corresponding to the second evaporator 141 is connected to the steam inlet of the first superheater 111 through a steam delivery pipe.

[0088] In the above-mentioned cement raw mill high-temperature flue gas purification device, the waste heat boiler unit 24 is assembled on the flue gas filtering and dust collector unit 23 to form a dust removal and heat exchange integrated equipment.

[0089] refer to Figure 3-6 As shown, the flue gas filter dust collector of the flue gas filter dust collector unit 23 includes a filter housing, an ash hopper is provided at the lower part of the filter housing, an ash unloading device is connected to the bottom of the ash hopper, a perforated plate is provided in the filter housing, a high temperature resistant filter element is installed on the perforated plate, the perforated plate and the high temperature resistant filter element separate the filter housing into a lower original air chamber and an upper clean air chamber, and the high temperature resistant filter element is located in the lower original air chamber; the flue of the waste heat boiler unit 24 is vertically or horizontally arranged and is located at the top and / or side of the filter housing.

[0090] In addition, the flue gas filter dust collector unit 23 includes a left-side flue gas filter dust collector and a right-side flue gas filter dust collector arranged in parallel along the left-right direction, and the left-side flue gas filter dust collector and the right-side flue gas filter dust collector respectively have at least one flue gas filter dust collector arranged along the front-to-back direction, and an air intake main flue is arranged between the left-side flue gas filter dust collector and the right-side flue gas filter dust collector, and the air intake main flue is respectively connected to the lower original air chamber of each of the flue gas filter dust collectors in the flue gas filter dust collector unit; the length of the tube bundle in the waste heat boiler unit 24 is set in the same direction as the left-right width of the flue gas filter dust collector unit 23.

[0091] The cement production system of the embodiment of the present invention comprises:

[0092] A raw material production section, wherein the raw material production section comprises a raw material mill, wherein the raw material mill is used to receive cement production raw materials and high-temperature gas from a cyclone preheater and output a first flue gas, wherein the first flue gas is fed into a homogenizer after first powder recovered by a first dust collector;

[0093] A clinker production section, wherein the clinker production section comprises a clinker cooler, wherein the clinker cooler is used to receive the clinker from the calcining equipment and cool it with air before outputting a second flue gas, wherein the second flue gas is fed into the clinker storage through a second powder recovered by a second dust collector;

[0094] The finished product production section includes a powder classifier, which is used to receive powder from the ball mill and output a third flue gas containing selected fine powder. The third powder recovered by the third flue gas through the third dust collector enters the finished product warehouse.

[0095] Wherein, the second dust collector adopts the above-mentioned cement clinker cooler high-temperature flue gas purification device, wherein the second flue gas enters the cement clinker cooler high-temperature flue gas purification device as the high-temperature flue gas output by the cooler, and the dust filtered by the flue gas filtration dust collector unit of the cement clinker cooler high-temperature flue gas purification device enters the clinker warehouse as the second powder, and the cooled flue gas is discharged;

[0096] And / or, the first dust collector adopts the above-mentioned cement raw mill high-temperature flue gas purification device, wherein the first flue gas enters the cement raw mill high-temperature flue gas purification device as the high-temperature flue gas output of the raw mill, and the dust filtered by the flue gas filter dust collector unit of the cement raw mill high-temperature flue gas purification device enters the homogenizer as the first powder, and the cooled flue gas is discharged.

[0097] The above is a description of the relevant contents of the present application. A person skilled in the art will be able to implement the present application based on these descriptions. Based on the above contents of this specification, all other embodiments obtained by a person skilled in the art without making any creative work shall fall within the scope of patent protection.

Claims

1. A high temperature flue gas purification device for a cement clinker cooler, characterized in that: include: A flue gas filtering dust collector unit, which is used to receive the high-temperature flue gas output by the cooler and physically intercept the dust in the high-temperature flue gas through a high-temperature resistant filter element, and then output the dust-removed flue gas with a temperature of 250°C-500°C; as well as A waste heat boiler unit is used to receive the dust-removed flue gas and the first feed water and respectively output water vapor and cooled flue gas after heat exchange; It also includes a pre-waste heat boiler unit, which is used to receive the high-temperature flue gas output by the cooler and the third feed water and respectively output water vapor and the cooled high-temperature flue gas after heat exchange; The flue gas filter dust collector unit is used to receive the high-temperature flue gas output by the pre-heat waste heat boiler unit and physically intercept the dust in the high-temperature flue gas through a high-temperature resistant filter element, and then output the dust-removed flue gas with a temperature of 250°C-500°C; The shell of the flue of the waste heat boiler unit and the shell of the flue of the pre-waste heat boiler unit are assembled with each other so that the waste heat boiler unit and the pre-waste heat boiler unit become an integrated heat exchange device, and the integrated heat exchange device is peripherally provided with an air supply flue and a return flue; The flue gas filtering and dust collecting unit is arranged beside the integrated heat exchange device, and the integrated heat exchange device connects the exhaust port of the flue of the pre-waste heat boiler unit with the air inlet of the flue of the flue through the air supply flue, and the integrated heat exchange device connects the air inlet of the flue of the waste heat boiler unit with the exhaust port of the flue of the flue of the flue through the return flue.

2. The high temperature flue gas purification device for cement clinker cooler according to claim 1, characterized in that: It also includes a feed water preheating unit for receiving the high-temperature dust and second feed water discharged by the flue gas filter dust collector unit and heating the second feed water by the high-temperature dust to output the first feed water formed by heating the second feed water; and / or, The high temperature resistant filter element is a filter bag, the filter bag comprises a metal filter membrane, the metal filter membrane is rolled into a tubular structure, the upper end of the tubular structure is provided with a joint and the lower end is sealed by a bottom cover, the joint is used to install the filter bag in the flue gas filter dust collector unit; and / or, The flue gas filter dust collector of the flue gas filter dust collector unit includes a filter housing, an ash hopper is provided at the lower part of the filter housing, an ash unloading device is connected to the bottom of the ash hopper, a perforated plate is provided in the filter housing, a high temperature resistant filter element is installed on the perforated plate, the perforated plate and the high temperature resistant filter element separate the filter housing into a lower original air chamber and an upper clean air chamber, and the high temperature resistant filter element is located in the lower original air chamber.

3. The high temperature flue gas purification device for cement clinker cooler according to claim 1, characterized in that: The flue gas filtering dust collector unit outputs dust-removed flue gas with a temperature of 300°C-500°C.

4. The high temperature flue gas purification device for cement clinker cooler according to claim 1, characterized in that: The flue of the pre-heat waste heat boiler unit is arranged vertically, the air inlet and the exhaust port of the pre-heat waste heat boiler unit are distributed at the lower part and the upper part of the flue of the pre-heat waste heat boiler unit, the lower part of the flue of the pre-heat waste heat boiler unit is provided with an ash hopper, and the bottom of the ash hopper is connected to an ash unloading mechanism; The flue of the waste heat boiler unit is arranged vertically, and the air inlet and the exhaust port of the waste heat boiler unit are distributed at the upper part and the lower part of the flue of the waste heat boiler unit; The exhaust port of the flue of the pre-heat waste heat boiler unit is connected with the air inlet of the flue of the waste heat boiler unit so that the pre-heat waste heat boiler unit and the waste heat boiler unit form an inverted U-shaped structure.

5. The high temperature flue gas purification device for cement clinker cooler according to claim 1, characterized in that: The heat exchange tubes in at least the waste heat boiler unit of the pre-heat waste heat boiler unit and the waste heat boiler unit are finned heat exchange tubes, and when the heat exchange tubes in the pre-heat waste heat boiler unit are not finned heat exchange tubes, smooth heat exchange tubes are used; and / or, The pre-waste heat boiler unit includes a first superheater, a first evaporator and a first economizer which are arranged in sequence from front to back along the flue of the pre-waste heat boiler unit; the waste heat boiler unit includes a second evaporator and a second economizer which are arranged in sequence from front to back along the flue of the waste heat boiler unit; the steam outlet of the steam drum corresponding to the second evaporator is connected to the steam inlet of the first superheater through a steam delivery pipe.

6. The high temperature flue gas purification device for cement clinker cooler according to claim 1, characterized in that: The waste heat boiler unit is assembled on the flue gas filter dust collector unit to form a dust removal and heat exchange integrated device; The flue gas filter dust collector of the flue gas filter dust collector unit comprises a filter housing, an ash hopper is provided at the lower part of the filter housing, an ash unloading device is connected to the bottom of the ash hopper, a perforated plate is provided in the filter housing, a high temperature resistant filter element is installed on the perforated plate, the perforated plate and the high temperature resistant filter element separate the filter housing into a lower original air chamber and an upper clean air chamber, and the high temperature resistant filter element is located in the lower original air chamber; The flue of the waste heat boiler unit is arranged vertically or horizontally and is located on the top and / or side of the filter housing.

7. The high temperature flue gas purification device for a cement clinker cooler according to claim 6, characterized in that: The flue gas filter dust collector unit comprises a left flue gas filter dust collector and a right flue gas filter dust collector arranged in parallel along the left-right direction, the left flue gas filter dust collector and the right flue gas filter dust collector respectively have at least one flue gas filter dust collector arranged along the front-back direction, an air intake main flue duct is arranged between the left flue gas filter dust collector and the right flue gas filter dust collector, and the air intake main flue duct is respectively connected to the lower original air chamber of each of the flue gas filter dust collectors in the flue gas filter dust collector unit; The length of the tube bundle in the waste heat boiler unit and the left-right width of the flue gas filter dust collector unit are arranged in the same direction.

8. Cement production system, including: A raw material production section, wherein the raw material production section comprises a raw material mill, wherein the raw material mill is used to receive cement production raw materials and high-temperature gas from a cyclone preheater and output a first flue gas, wherein the first flue gas is fed into a homogenizer after first powder recovered by a first dust collector; A clinker production section, wherein the clinker production section comprises a clinker cooler, wherein the clinker cooler is used to receive the clinker from the calcining equipment and cool it with air before outputting a second flue gas, wherein the second flue gas is fed into the clinker storage through a second powder recovered by a second dust collector; The finished product production section includes a powder classifier, which is used to receive powder from the ball mill and output a third flue gas containing selected fine powder. The third powder recovered by the third dust collector from the third flue gas enters the finished product warehouse; It is characterized in that: the second dust collector adopts the high-temperature flue gas purification device of the cement clinker cooler as described in any one of claims 1 to 7, wherein the second flue gas enters the high-temperature flue gas purification device of the cement clinker cooler as the high-temperature flue gas output by the cooler, and the dust filtered by the flue gas filtration and dust removal unit of the high-temperature flue gas purification device of the cement clinker cooler enters the clinker storage as the second powder, and the cooled flue gas is discharged.

9. The cement production system according to claim 8, characterized in that: The first dust collector adopts a cement raw mill high temperature flue gas purification device, and the cement raw mill high temperature flue gas purification device comprises: A flue gas filtering dust collector unit is used to receive the high-temperature flue gas output by the raw mill and physically intercept the dust in the high-temperature flue gas through a high-temperature resistant filter element, and then output the dust-removed flue gas with a temperature of 250°C-400°C; An SCR denitration reactor unit is used to receive the dust-removed flue gas to which an SCR denitration reducing agent is added and output the denitration flue gas after passing through an SCR denitration catalyst; a waste heat boiler unit, for receiving the denitrified flue gas and feed water and respectively outputting water vapor and cooled flue gas after heat exchange; and An SCR denitration reducing agent output pipeline unit, used for adding the SCR denitration reducing agent into the high-temperature flue gas conveying channel and / or the dust-removed flue gas conveying channel; Among them, the first flue gas enters the cement raw mill high-temperature flue gas purification device as the high-temperature flue gas output by the raw mill, the dust filtered by the flue gas filter dust collector unit of the cement raw mill high-temperature flue gas purification device enters the homogenizer as the first powder, and the cooled flue gas is discharged.

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