Device suitable for ultra-clean emission of flue gas of special kiln

Abstract

The utility model relates to the field of environmental protection or cement production, and discloses a flue gas ultra-clean emission device suitable for a special kiln, the flue gas ultra-clean emission device comprises a receptor device for generating NOx and a HiDe-NOx system for realizing NOx ultra-clean emission, the HiDe-NOx system realizes accurate regulation and control of the use amount of a reducing agent at each terminal point through mechanisms distributed outside the receptor device, and the use amount of the reducing agent at each terminal point is controlled by the HiDe-NOx system. And through accurate setting of different terminal reducing agent filling point positions, the apparent utilization rate of the reducing agent is made to be close to the microscopic utilization rate to the maximum extent, the use amount of the reducing agent is reduced to the maximum extent, and it is guaranteed that the emission value of NOx of tail exhaust flue gas reaches the standard. Through the utilization rate precise ammonia spraying driven HiDe-NOx system, collaborative control over a selective non-catalytic section and a selective catalytic reduction section can be achieved, steady-state blocking-edge operation of the NOx emission value of tail exhaust flue gas is guaranteed, and a qualitative leap is achieved compared with conventional independent denitration systems such as SNCR, SCR and HSNCR.

Description

Technical Field

[0001] This application relates to the fields of environmental protection or cement production technology, and in particular to a device suitable for ultra-clean emission of flue gas from a special kiln. Background Technology

[0002] In 2020, the Ministry of Ecology and Environment issued the "Technical Guidelines for Formulating Emergency Emission Reduction Measures for Key Industries During Heavy Pollution Weather (2020 Revised Edition)" (hereinafter referred to as "Document No. 340 of the Ministry of Ecology and Environment

[2020] "), which clearly stipulates the ultra-clean emission limits for 39 industries. To achieve ultra-clean emission requirements, the denitrification process needs to be equipped with a new SCR system. Taking the cement industry as an example, affected by the "Emission Standard of Air Pollutants for Cement Industry (GB4915-2013)," before the issuance of Document No. 340 of the Ministry of Ecology and Environment

[2020] , more than 1,600 cement clinker production lines nationwide had already installed SNCR denitrification systems. With the promotion of the ultra-clean emission "storm," about 200 SCR devices have been applied to cement kilns, but few have been able to achieve long-term stable operation. Analysis revealed that currently, none of the SCR denitrification catalysts are immune to the poisoning effects of alkali metals and alkaline earth metals. Furthermore, SCRs must be installed in the process system between the C1 outlet and the raw material mill. This section has insufficient temperature, high content of alkaline earth metals and calcium oxide, and a certain amount of SO2. These impurities significantly impact the SCR denitrification catalyst, particularly by accelerating the degradation of its ammonia-nitrogen reaction efficiency. Moreover, the lack of a communication mechanism between existing SNCR or precision denitrification systems and the newly built SCRs leads to frequent drastic fluctuations in NOx emission concentrations and uncontrolled ammonia injection during operational fluctuations. This not only fails to ensure stable NOx emissions but also increases the consumption of reducing agent per unit product and reduces the lifespan of the SCR catalyst. This is the main reason why current SCR systems generally cannot achieve long-term steady-state operation.

[0003] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Utility Model Content

[0004] To address the aforementioned problems, this application provides a device suitable for ultra-clean emission of flue gas from a special type of kiln.

[0005] The device for ultra-clean emission of flue gas from a special kiln provided in this application adopts the following technical solution:

[0006] A device suitable for certain special kiln flue gas ultra-clean emission, comprising a receptor device and HiDe-NOx system, the receptor device is composed of smoke chamber, decomposition furnace, goose neck pipe, inverted furnace, C1 wind pipe, five-stage preheater, four-stage preheater, three-stage preheater, two-stage preheater, first-stage preheater A and first-stage preheater B;

[0007] The HiDe-NOx system comprises a discharge pump, a raw material storage tank, a compressed air storage tank, a feed pump, a raw material conditioner, a decomposition furnace distribution module, a decomposition furnace atomization module, an inverted furnace distribution module, an inverted furnace atomization module, a five-stage distribution module, a five-stage atomization module, a four-stage distribution module, a four-stage atomization module, a first-stage distribution module, a first-stage atomization module, an SCR distribution module, an SCR atomization module and a raw material gasifier.

[0008] The discharge pump is connected to the upper part of the raw material storage tank, the lower part of the raw material storage tank is connected to the inlet of the feed pump, the outlet of the feed pump is connected to the inlet of the raw material conditioner, the outlet of the raw material conditioner is connected to the decomposition furnace distribution module, the inverted furnace distribution module, the five-stage distribution module, the four-stage distribution module, the first-stage distribution module and the SCR distribution module respectively, the decomposition furnace distribution module, the inverted furnace distribution module, the five-stage distribution module, the four-stage distribution module and the first-stage distribution module are connected to the corresponding decomposition furnace atomization module, inverted furnace atomization module, five-stage atomization module, four-stage atomization module and first-stage atomization module respectively, the SCR distribution module is connected to the SCR atomization module through the SCR atomization module, and the compressed air storage tank is connected to the decomposition furnace distribution module, the inverted furnace distribution module, the five-stage distribution module, the four-stage distribution module, the first-stage distribution module and the SCR distribution module through pipeline valves respectively.

[0009] Preferably, the feed pump is provided with a raw material conditioner between the decomposition furnace distribution module, the inverted furnace distribution module, the five-stage distribution module, the four-stage distribution module, the first-stage distribution module or the SCR distribution module.

[0010] Further, the feed pump and the raw material conditioner are connected through 1-8 groups of control valves and pipelines.

[0011] Preferably, the decomposition furnace distribution module is composed of 1-6 groups of valves, instruments, pipelines and other execution mechanisms that can simultaneously control the gas-liquid phase flow and pressure, each group of execution mechanisms is provided with a pressure gauge, a flow meter and a control valve and other hardware devices, and the execution mechanisms are independent of each other.

[0012] Further, the inverted furnace distribution module, the five-stage distribution module, the four-stage distribution module, the first-stage distribution module and the SCR distribution module all have the same or similar mechanisms as the decomposition furnace distribution module.

[0013] Preferably, the decomposition furnace atomization module is composed of 1-6 groups of atomizers independent of each other.

[0014] Further, each group of atomizers is equipped with temperature, pressure, flow meters and control valves.

[0015] Further, the upside-down furnace atomization module, the five-stage atomization module, the four-stage atomization module and the one-stage atomization module all have the same or similar configuration as the decomposition furnace atomization module.

[0016] Preferably, the reducing agent sprayed from the SCR atomization module is a fluid with a temperature of 2℃ above and below the bubble point temperature of the reducing agent solution.

[0017] Further, the end effector of the SCR atomization module is similar to the end atomizer of the decomposition furnace atomization module or has no end effector but is connected to the end of the SCR system's rake blowing.

[0018] Preferably, the raw material gasifier is implanted in the lower part of the SCR denitration tower.

[0019] Further, the raw material gasifier is composed of 3-600 seamless steel pipes with a diameter of 15-89 mm and a length of 2-6 m.

[0020] In summary, the present application has the following beneficial technical effects:

[0021] The present application utilizes the HiDe-NOx system to realize precise control of the reducing agent dosage at each terminal point through the decomposition furnace distribution module, the upside-down furnace distribution module, the five-stage distribution module, the four-stage distribution module, the one-stage distribution module and the SCR distribution module distributed outside the receptor device, and realizes precise setting of the reducing agent injection point at different terminals through the decomposition furnace atomization module, the upside-down furnace atomization module, the five-stage atomization module, the four-stage atomization module, the one-stage atomization module and the SCR atomization module distributed on the receptor device, so as to maximize the apparent utilization rate of the reducing agent to approach the microscopic utilization rate, minimize the reducing agent dosage, and ensure that the tail exhaust gas NOx emission value meets the emission standard. Due to the utilization of the HiDe-NOx system driven by precise ammonia injection, the present application can realize collaborative control of the selective non-catalytic reduction section and the selective catalytic reduction section, and ensure stable and steady-state operation of the tail exhaust gas NOx emission value, which is a qualitative leap compared with the conventional SNCR, SCR and HSNCR independent denitration systems. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic diagram of Embodiment 1 of the present application.

[0023] Explanation of reference signs: 1, smoke chamber; 12, decomposition furnace; 13, swan neck pipe; 14, inverted furnace; 15, C1 wind collecting main pipe; C5, five-stage preheater; C4, four-stage preheater; C3, three-stage preheater; C2, two-stage preheater; C1A, first-stage preheater A; C1B, first-stage preheater B; 21, discharge pump; 22, raw material storage tank; 23, compressed air storage tank; 24, feeding pump; 25, raw material conditioning device; 31A, decomposition furnace distribution module; 31B, decomposition furnace atomization module; 32A, inverted furnace distribution module; 32B, inverted furnace atomization module; 33A, five-stage distribution module; 33B, five-stage atomization module; 34A, four-stage distribution module; 34B, four-stage atomization module; 35A, first-stage distribution module; 35B, first-stage atomization module; 36A, SCR distribution module; 36B, SCR atomization module; 36C, raw material gasifier. DETAILED DESCRIPTION

[0024] The following will be described in detail with reference to the accompanying drawings. Figure 1 The present application is further described in detail.

[0025] The embodiment of the present application discloses a device suitable for certain special kiln flue gas ultra-clean emission, referring to Figure 1 , comprising a receptor device and a HiDe-NOx system, the receptor device is composed of a smoke chamber 11, a decomposition furnace 12, a swan neck pipe 13, an inverted furnace 14, a C1 wind collecting main pipe 15, a five-stage preheater C5, a four-stage preheater C4, a three-stage preheater C3, a two-stage preheater C2, a first-stage preheater AC1A and a first-stage preheater BC1B.

[0026] The HiDe-NOx system comprises a discharge pump 21, a raw material storage tank 22, a compressed air storage tank 23, a feeding pump 24, a raw material conditioning device 25, a decomposition furnace distribution module 31A, a decomposition furnace atomization module 31B, an inverted furnace distribution module 32A, an inverted furnace atomization module 32B, a five-stage distribution module 33A, a five-stage atomization module 33B, a four-stage distribution module 34A, a four-stage atomization module 34B, a first-stage distribution module 35A, a first-stage atomization module 35B, an SCR distribution module 36A, an SCR atomization module 36B and a raw material gasifier 36C.

[0027] The unloading pump 21 is connected with the upper part of the raw material storage tank 22, the lower part of the raw material storage tank 22 is connected with the inlet of the feeding pump 24, the outlet of the feeding pump 24 is connected with the inlet of the raw material conditioner 25, the outlet of the raw material conditioner 25 is connected with the decomposition furnace distribution module 31A, the hanging furnace distribution module 32A, the five-stage distribution module 33A, the four-stage distribution module 34A, the first-stage distribution module 35A and the SCR distribution module 36A respectively, the decomposition furnace distribution module 31A, the hanging furnace distribution module 32A, the five-stage distribution module 33A, the four-stage distribution module 34A and the first-stage distribution module 35A are connected with the corresponding decomposition furnace atomization module 31B, the hanging furnace atomization module 32B, the five-stage atomization module 33B, the four-stage atomization module 34B and the first-stage atomization module 35B respectively, the SCR distribution module 36A is connected with the SCR atomization module 36B through the SCR atomization module 36B, and the compressed air storage tank 23 is connected with the decomposition furnace distribution module 31A, the hanging furnace distribution module 32A, the five-stage distribution module 33A, the four-stage distribution module 34A, the first-stage distribution module 35A and the SCR distribution module 36A through the pipeline valve respectively.

[0028] With reference to Figure 1 , the feeding pump 24 is arranged between the decomposition furnace distribution module 31A, the hanging furnace distribution module 32A, the five-stage distribution module 33A, the four-stage distribution module 34A, the first-stage distribution module 35A or the SCR distribution module 36A and the raw material conditioner 25.

[0029] Further, the feeding pump 24 of the raw material conditioner 25 is realized through 1-8 groups of control valves and pipelines.

[0030] With reference to Figure 1 The decomposition furnace distribution module 31A is composed of 1-6 groups of valve, instrument, pipeline and other execution mechanisms that can simultaneously control the gas-liquid phase flow and pressure, each group of execution mechanisms is composed of a pressure gauge, a flow meter and a control valve and other hardware devices matched with the execution mechanisms, and the execution mechanisms are independent of each other.

[0031] Further, the hanging furnace distribution module 32A, the five-stage distribution module 33A, the four-stage distribution module 34A, the first-stage distribution module 35A and the SCR distribution module 36A all have the same or similar mechanisms as the decomposition furnace distribution module 31A.

[0032] With reference to Figure 1 The decomposition furnace atomization module 31B is composed of 1-6 groups of atomizers independent of each other.

[0033] Further, each group of atomizers is composed of a temperature, pressure and flow meter and a control valve matched with the atomizers.

[0034] Further, the upside-down furnace atomization module 32B, the five-stage atomization module 33B, the four-stage atomization module 34B, and the one-stage atomization module 35B all have the same or similar configuration as the decomposition furnace atomization module 31B.

[0035] Referring to Figure 1 The reducing agent sprayed from the SCR atomization module 36B is a fluid with a temperature of 2℃ above and below the bubble point temperature of the reducing agent solution.

[0036] Further, the end effector of the SCR atomization module 36B is similar to the end atomizer of the decomposition furnace atomization module 31B or has no end effector but is connected to the end of the SCR system's rake blowing.

[0037] Referring to Figure 1 The raw material gasifier 36C is implanted in the lower part of the SCR denitration tower 16.

[0038] Further, the raw material gasifier 36C is composed of 3-600 seamless steel pipes with a diameter of 15-89 mm and a length of 2-6 m.

[0039] The present application realizes ultra-low emission of NOx by adopting the HiDe-NOx system mode driven by the current precise ammonia injection mode, grasps the essence of precise denitration from the aspects of mechanism and practice, realizes the cooperation of SCR and SNCR, grasps the time-normalized NOx production and sales, the time-normalized reducing agent quality, and the time-normalized ammonia efficiency through the HiDe-NOx system, the difference between the same reducing agent apparent utilization rate and micro utilization rate is reduced by 8-37%, the same unit product reducing agent consumption is reduced by 13-43%, meanwhile, the HiDe-NOx system has a strong prediction mechanism, can predict the NOx trend after 85-113S, provides a longer preparation time for regulating the reducing agent supply amount, the less action and micro adjustment mode can effectively prolong the service life of the high-precision valve and atomizer, and the single technology presents a reducing agent saving rate increase of 3-8%.

[0040] Finally, it should be pointed out that: first, in the description of the present application, it should be pointed out that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, which can be mechanical connection or electrical connection, or the communication between two elements, or direct connection, "up", "down", "left", "right" and the like are only used to represent the relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may change;

[0041] Secondly: the utility model discloses the embodiment in the drawing, only relate to the structure involved in the embodiment of the present disclosure, other structures can refer to the usual design, under the condition of no conflict, the same embodiment and different embodiments of the utility model can be combined with each other;

[0042] Finally: the above only for the preferred embodiments of the present application have, and not for limiting the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, should be included in the scope of protection of the present application.

[0043] The above are the preferred embodiments of the present application, and are not limited by the scope of protection of the present application, therefore: any equivalent changes made in accordance with the structure, shape, principle of the present application, should be covered within the scope of protection of the present application.

Claims

1. A device suitable for ultra-clean emission of flue gas from a certain type of kiln, characterized in that, The application relates to a receiver device and a HiDe-NOx system. The HiDe-NOx system comprises a feed pump (24), a raw material conditioner (25), a decomposition furnace distribution module (31A), a decomposition furnace atomization module (31B), an inverted furnace distribution module (32A), an inverted furnace atomization module (32B), a five-stage distribution module (33A), a five-stage atomization module (33B), a four-stage distribution module (34A), a four-stage atomization module (34B), a first-stage distribution module (35A), a first-stage atomization module (35B), an SCR distribution module (36A), an SCR atomization module (36B) and a raw material gasifier (36C). The outlet of the feed pump (24) is connected with the inlet of the raw material conditioner (25), the outlet of the raw material conditioner (25) is connected with the decomposition furnace distribution module (31A), the inverted furnace distribution module (32A), the five-stage distribution module (33A), the four-stage distribution module (34A), the first-stage distribution module (35A) and the SCR distribution module (36A) respectively, the decomposition furnace distribution module (31A), the inverted furnace distribution module (32A), the five-stage distribution module (33A), the four-stage distribution module (34A) and the first-stage distribution module (35A) are connected with the corresponding decomposition furnace atomization module (31B), the inverted furnace atomization module (32B), the five-stage atomization module (33B), the four-stage atomization module (34B) and the first-stage atomization module (35B) respectively, and the SCR distribution module (36A) is connected with the SCR atomization module (36B) through the SCR atomization module (36B).

2. The device for ultra-clean emission of flue gas from a special kiln according to claim 1, characterized in that, The feed pump (24) is arranged with the raw material conditioner (25) between the decomposition furnace distribution module (31A), the inverted furnace distribution module (32A), the five-stage distribution module (33A), the four-stage distribution module (34A), the first-stage distribution module (35A) or the SCR distribution module (36A).

3. The device for ultra-clean emission of flue gas from a special kiln according to claim 1, characterized in that, The decomposition furnace atomization module (31B) is composed of 1-6 groups of independent atomizers.

4. The device for ultra-clean emission of flue gas from a special kiln according to claim 3, characterized in that, Each group of atomizers is matched with temperature, pressure, flow meter and control valve.

5. The device for ultra-clean emission of flue gas from a special kiln according to claim 1, characterized in that, The reducing agent sprayed from the SCR atomization module (36B) is a fluid with a temperature of 2℃ above and below the bubble point temperature of the reducing agent solution.

6. The device for ultra-clean emission of flue gas from a special kiln according to claim 1, characterized in that, The raw material gasifier (36C) is implanted in the lower part of the SCR denitration tower (16).

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