CN212167064U

CN212167064U - Novel SCR denitration economizer system

Info

Publication number: CN212167064U
Application number: CN202020803775.3U
Authority: CN
Inventors: 王东岗; 张双进; 王胜利; 裴彦兵
Original assignee: Beijing Handong Environmental Engineering Co ltd
Current assignee: Beijing Handong Environmental Engineering Co ltd
Priority date: 2020-05-15
Filing date: 2020-05-15
Publication date: 2020-12-18
Anticipated expiration: 2030-05-15

Abstract

A novel SCR denitration energy-saving system comprises an ammonia water storage tank, an ammonia supply system, an efficient gasifier, a hot air system, an ash falling channel, an SCR denitration reactor and a control system; the ammonia water storage tank is connected with the ammonia inlet end of the high-efficiency gasifier through an ammonia supply system; the hot air system comprises a boiler and a hot flue gas channel; the air outlet end of the boiler is connected with the air inlet end of the high-efficiency gasifier through a hot flue gas channel; the ash falling channel is arranged between the high-efficiency gasifier and the hot air system; the gas outlet end of the high-efficiency gasifier is connected with the SCR denitration reactor; the control system comprises an air volume control module and an ammonia supply control module; the air volume control module comprises a gasification monitoring module and an air volume control module; the ammonia supply control module comprises a denitration monitoring module, a feedback module and an ammonia supply control module. The utility model realizes the dynamic control of oxynitride and energy consumption, and greatly reduces the energy consumption of the SCR denitration system; the system has the advantages of simple equipment, smooth process, convenient maintenance, long equipment replacement period, stable operation, energy conservation and high efficiency.

Description

Novel SCR denitration economizer system

Technical Field

The utility model relates to an energy-concerving and environment-protective technical field especially relates to a novel SCR denitration economizer system.

Background

The denitration engineering of fire coal, gas, biomass, garbage incineration and the like mostly uses an SCR denitration technology at present, and an ammonia evaporator is generally adopted in the ammonia evaporation process in SCR denitration; in consideration of safety problems, the ammonia gas is diluted by a dilution fan to supplement air, and an electric heater is used for heating, and the energy consumption of the ammonia gas is 60-80% of that of SCR denitration.

With the promotion of national energy saving and emission reduction policies and the general requirements of enterprises on reducing energy consumption and improving production efficiency, a novel SCR denitration energy-saving system with wide application prospect and obvious energy-saving effect is urgently needed to be developed.

SUMMERY OF THE UTILITY MODEL

Objects of the invention

In order to solve the technical problems existing in the background technology, the utility model provides a novel SCR denitration energy-saving system, which realizes the dynamic control of nitrogen oxides and energy consumption and greatly reduces the energy consumption of the SCR denitration system; the system has the advantages of simple equipment, smooth process, convenient maintenance, long equipment replacement period, stable operation, energy conservation and high efficiency.

(II) technical scheme

The utility model provides a novel SCR denitration energy-saving system, which comprises an ammonia water storage tank, an ammonia supply system, a high-efficiency gasifier, a hot air system, an ash falling channel, an SCR denitration reactor and a control system;

the ammonia water storage tank is connected with the ammonia inlet end of the high-efficiency gasifier through an ammonia supply system; the hot air system comprises a boiler and a hot flue gas channel; the air outlet end of the boiler is connected with the air inlet end of the high-efficiency gasifier through a hot flue gas channel; the ash falling channel is arranged between the high-efficiency gasifier and the hot air system; the gas outlet end of the high-efficiency gasifier is connected with the SCR denitration reactor;

the control system comprises an air volume control module and an ammonia supply control module; the air volume control module comprises a gasification monitoring module and an air volume control module; the gasification monitoring module is arranged in the high-efficiency gasifier; the air volume control module is arranged at the air inlet end of the hot flue gas channel; the ammonia supply control module comprises a denitration monitoring module, a feedback module and an ammonia supply control module; the denitration monitoring modules are arranged in two groups and are respectively arranged at the inlet and the outlet of the SCR denitration reactor; the feedback module is in communication connection with the ammonia supply system and the SCR denitration reactor; the ammonia supply control module is arranged at an ammonia outlet end of the ammonia supply system.

Preferably, the ammonia supply system comprises an ammonia water metering pump and a standby ammonia water metering pump.

Preferably, the ash falling channel is provided as a discharge chute.

Preferably, an ammonia water spraying and atomizing device and an ammonia gas channel are arranged in the high-efficiency gasifier; the water inlet of the ammonia water spraying and atomizing device is connected with the ammonia outlet end of the ammonia supply system, and the gas outlet is connected with the input end of the ammonia gas channel; the output end of the ammonia gas channel is connected with the SCR denitration reactor.

Preferably, the air inlet end of the hot flue gas channel is provided with a hot air fan.

Compared with the prior art, the above technical scheme of the utility model following profitable technological effect has:

firstly, the utility model can dynamically adjust the hot air quantity according to the change of the oxynitride at the outlet of the boiler;

secondly, an ammonia water evaporator, an ammonia-air mixer and a dilution air heating system in the prior art are eliminated, so that the SCR denitration system is more stable and energy-saving to operate, and the construction investment cost and the operation maintenance cost are reduced;

thirdly, the ammonia escape phenomenon after SCR denitration is effectively avoided through positive and negative feedback of the ammonia supply control module;

fourthly, the system equipment is simple, the process is smooth, the maintenance is convenient, the equipment replacement period is long, the operation is stable, and the efficiency and the energy conservation are realized.

Drawings

Fig. 1 is the utility model provides a novel SCR denitration economizer system's process flow diagram.

Reference numerals: 1. an ammonia water storage tank; 2. an ammonia supply system; 3. a high efficiency gasifier; 4. a hot air system; 5. a dust falling passage; 6. SCR denitration reactor.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

As shown in fig. 1, the utility model provides a novel SCR denitration energy-saving system, which comprises an ammonia water storage tank 1, an ammonia supply system 2, a high-efficiency gasifier 3, a hot air system 4, an ash falling channel 5, an SCR denitration reactor 6 and a control system;

the ammonia water storage tank 1 is connected with the ammonia inlet end of the high-efficiency gasifier 3 through an ammonia supply system 2; the hot air system 4 comprises a boiler and a hot flue gas channel; the air outlet end of the boiler is connected with the air inlet end of the high-efficiency gasifier 3 through a hot flue gas channel; the ash falling channel 5 is arranged between the high-efficiency gasifier 3 and the hot air system 4; the gas outlet end of the high-efficiency gasifier 3 is connected with the SCR denitration reactor 6;

the control system comprises an air volume control module and an ammonia supply control module; the air volume control module comprises a gasification monitoring module and an air volume control module; the gasification monitoring module is arranged inside the high-efficiency gasifier 3; the air volume control module is arranged at the air inlet end of the hot flue gas channel; the ammonia supply control module comprises a denitration monitoring module, a feedback module and an ammonia supply control module; the denitration monitoring modules are arranged in two groups and are respectively arranged at the inlet and the outlet of the SCR denitration reactor 6; the feedback module is in communication connection with the ammonia supply system 2 and the SCR denitration reactor 6; the ammonia supply control module is arranged at the ammonia outlet end of the ammonia supply system 2.

In an alternative embodiment, the ammonia supply system 2 includes an ammonia water metering pump and a back-up ammonia water metering pump.

In an alternative embodiment, the ash chute 5 is provided as a discharge chute.

In an optional embodiment, an ammonia water spraying and atomizing device and an ammonia gas channel are arranged inside the high-efficiency gasifier 3; the water inlet of the ammonia water spraying and atomizing device is connected with the ammonia outlet end of the ammonia supply system 2, and the air outlet is connected with the input end of the ammonia gas channel; the output end of the ammonia gas channel is connected with the SCR denitration reactor 6.

In an alternative embodiment, the air inlet end of the hot flue gas channel is provided with a hot air blower.

The ammonia water storage tank 1 conveys ammonia water into the high-efficiency gasifier 3 through the ammonia supply system 2; high-efficient vaporizer 3 passes through 4 energy supplies of hot air system, turns into oxynitride with the aqueous ammonia, carries oxynitride to SCR denitration reactor 6 again, accomplishes the denitration to detect waste gas, discharge after up to standard.

The hot air system 4 supplies energy to the high-efficiency gasifier 3 through the boiler, the oxygen content of the boiler smoke is low, and ammonia gas is mixed in the high-efficiency gasifier 3, so that the flammable and explosive risks after the ammonia gas and air are mixed are avoided; even if ammonia in the pipeline flows back to the boiler, the ammonia mixing safety coefficient of the boiler is higher than that of the ammonia in the air, and the requirement of safety production is met to a greater extent.

The gasification monitoring module detects the index of the oxynitride in the high-efficiency gasifier 3 in real time and sends a signal to the air volume control module, and the air volume control module controls a hot air fan at the air inlet end of the hot flue gas channel according to the index of the oxynitride in the high-efficiency gasifier 3 and adjusts the size of hot air conveyed to the high-efficiency gasifier 3 by the boiler; the air volume control module is arranged to ensure that nitrogen oxide entering the SCR denitration reactor 6 is in an optimal state after being gasified in the high-efficiency gasifier 3.

The denitration monitoring module respectively detects indexes of oxynitride and ammonia gas in the pipeline before and after the reaction of the SCR denitration reactor 6 and sends the indexes to the feedback module; if the index of the reacted oxynitride is higher, the ammonia gas input into the SCR denitration reactor 6 is insufficient, and the feedback module gives positive feedback to the ammonia supply system 2 so as to increase the ammonia gas input into the SCR denitration reactor 6; if the index of the reacted oxynitride is low and the ammonia content is detected, the ammonia amount input into the SCR denitration reactor 6 is too high, and the feedback module gives negative feedback to the ammonia supply system 2 to reduce the ammonia amount input into the SCR denitration reactor 6; the ammonia detection module is arranged to solve the ammonia escape phenomenon after SCR denitration, reduce environmental pollution and realize the production purpose of energy conservation and environmental protection.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims

1. A novel SCR denitration energy-saving system is characterized by comprising an ammonia water storage tank (1), an ammonia supply system (2), a high-efficiency gasifier (3), a hot air system (4), an ash falling channel (5), an SCR denitration reactor (6) and a control system;

the ammonia water storage tank (1) is connected with the ammonia inlet end of the high-efficiency gasifier (3) through an ammonia supply system (2); the hot air system (4) comprises a boiler and a hot flue gas channel; the air outlet end of the boiler is connected with the air inlet end of the high-efficiency gasifier (3) through a hot flue gas channel; the ash falling channel (5) is arranged between the high-efficiency gasifier (3) and the hot air system (4); the gas outlet end of the high-efficiency gasifier (3) is connected with the SCR denitration reactor (6);

the control system comprises an air volume control module and an ammonia supply control module; the air volume control module comprises a gasification monitoring module and an air volume control module; the gasification monitoring module is arranged inside the high-efficiency gasifier (3); the air volume control module is arranged at the air inlet end of the hot flue gas channel; the ammonia supply control module comprises a denitration monitoring module, a feedback module and an ammonia supply control module; the denitration monitoring modules are arranged in two groups and are respectively arranged at the inlet and the outlet of the SCR denitration reactor (6); the feedback module is in communication connection with the ammonia supply system (2) and the SCR denitration reactor (6); the ammonia supply control module is arranged at the ammonia outlet end of the ammonia supply system (2).

2. The novel SCR denitration energy-saving system of claim 1, wherein an ammonia water metering pump and a standby ammonia water metering pump are arranged in a pipeline of the ammonia supply system (2).

3. The novel SCR denitration energy-saving system of claim 1, wherein the ash falling channel (5) is arranged as a discharge chute.

4. The novel SCR denitration energy-saving system according to claim 1, wherein an ammonia water spraying and atomizing device and an ammonia gas channel are arranged inside the high-efficiency gasifier (3); the water inlet of the ammonia water spraying and atomizing device is connected with the ammonia outlet end of the ammonia supply system (2), and the air outlet is connected with the input end of the ammonia gas channel; the output end of the ammonia gas channel is connected with the SCR denitration reactor (6).

5. The novel SCR denitration energy-saving system of claim 1, wherein a hot air blower is arranged at the air inlet end of the hot flue gas channel.