CN206817995U - A cement kiln waste heat recovery online integrated system - Google Patents

Abstract

The utility model discloses a kind of online integral system of cement kiln waste heat recovery, include firing system, pre-heating system, kiln tail waste heat boiler, high-temperature blower, grate-cooler, kiln hood waste heat pot, bag collector, the high-temperature flue gas part that the firing system is burnt till is entered in pre-heating system through kiln tail portion, subsequently into kiln tail waste heat boiler, most it is sent to kiln tail gas system through high-temperature blower afterwards, another part is worked by the grate-cooler of kiln hood position and is passed into high-temperature flue gas in kiln hood waste heat boiler by flue, its high-temperature flue gas is passed through bag filter again after kiln hood waste heat boiler, discharged through kiln head exhaust fan and chimney.Use of the present utility model, has saved construction investment, simplifies technique and management process, improves production efficiency, therefore the utility model has good market popularization value.

Description

A cement kiln waste heat recovery online integrated system

Technical field:

The utility model relates to the field of cement clinker production lines, and mainly relates to an online integrated system for recovering waste heat from a cement kiln.

Background technique:

The existing cement clinker production line system, as shown in Figure 1 and Figure 3, generally includes a preheater system 1, a kiln tail humidification and cooling device 2, a kiln tail waste heat boiler 3, a high-temperature fan 4, a firing system 5, a grate Cooling machine 6, kiln head waste heat boiler 7, air cooler 8, bag filter 9, kiln head exhaust fan 10, chimney 11. Among them, the flue gas process at the kiln tail is that the high-temperature flue gas enters the waste heat boiler at the kiln tail and the humidification cooling device after being connected to the preheater system. The flue gas after boiler or humidification and cooling device desuperheats enters the high-temperature fan and sends it to the waste gas system at the end of the kiln; the flue gas flow at the kiln head is that the high-temperature flue gas from the grate cooler is connected to the waste heat boiler at the kiln head and the air cooling device through different flue gas pipes. The boiler at the kiln head and the air cooler are in a parallel standby relationship. After being cooled by the waste heat boiler at the kiln head or the air cooler, the high-temperature flue gas enters the bag filter and is discharged through the exhaust fan at the kiln head and the chimney.

In recent years, with the domestic waste heat power generation equipment and management level becoming more and more mature, the stability and reliability of the waste heat power generation system have been improved qualitatively. 1. The air cooler 8 is basically in an idle state, which not only wastes the investment, but also increases the maintenance of the equipment.

Utility model content:

The purpose of the utility model is to make up for the defects of the prior art, and provide an online integrated system for recovering waste heat from a cement kiln, so as to solve the problem of idle waste of the flue gas cooling equipment in the cement production line of the prior art.

The utility model is achieved through the following technical solutions:

An online integrated system for recovery of waste heat from a cement kiln, including a firing system, a preheater system, a waste heat boiler at the kiln tail, a high-temperature fan, a grate cooler, a waste heat boiler at the kiln head, and a bag dust collector. The firing system produces Part of the high-temperature flue gas enters the preheater system through the kiln tail, then enters the waste heat boiler at the kiln tail, and finally is sent to the waste gas system at the kiln tail through a high-temperature fan, and the other part passes the high-temperature flue gas through the grate cooler at the kiln head. The flue gas pipeline leads into the waste heat boiler at the kiln head, and the high-temperature flue gas passes through the waste heat boiler at the kiln head and then enters the bag filter, and is discharged through the exhaust fan at the kiln head and the chimney.

The grate cooler is respectively provided with three air intakes, one of which is located at the front of the grate cooler, the other is located at the middle of the grate cooler, and the third air intake is located at the tail of the grate cooler. The flue air valve group can control the inlet air temperature entering the waste heat boiler at the kiln head.

The principle is: since the exhaust gas system at the kiln tail has no special requirements on the exhaust gas temperature, on the one hand, the humidification and cooling device is canceled in the new process, and the flue gas is directly cooled by the preheater to the waste heat boiler at the kiln tail, and then enters the high-temperature fan and sent to In the kiln tail exhaust gas system, no matter whether the boiler is running or not, the high-temperature flue gas from the preheater is directly cooled by the boiler and then enters the high-temperature fan, and then sent to the kiln tail exhaust gas system. On the other hand, the air cooler is canceled, and the flue gas from the grate cooler is directly cooled by the waste heat boiler at the kiln head, and then enters the bag filter, and is discharged by the exhaust fan at the kiln head and the chimney. According to the temperature requirements of the exhaust gas of the kiln head system, the combined air intake design of the grate cooler can control the temperature of the inlet air entering the waste heat boiler of the kiln head through the smoke and air valve group on the air pipe, so as to ensure the kiln head system under various working conditions. The exhaust gas temperature meets the requirements.

The utility model has the advantages of:

Based on the original cement clinker production line, the utility model cancels the flue gas cooling equipment (including air cooler, humidification and cooling device), and uses the kiln head and kiln tail waste heat boiler directly as the flue gas heat recovery in the cement clinker production line And cooling equipment, so that the waste heat boiler is integrated into a part of the online integrated production of cement clinker, rather than additional equipment. The use of the utility model saves construction investment, simplifies the process and management flow, and improves production efficiency, so the utility model has good market promotion value.

Description of drawings:

Fig. 1 is the process flow chart of existing kiln tail.

Fig. 2 is a process flow diagram of the kiln tail of the utility model.

Fig. 3 is the process flow chart of existing kiln head.

Fig. 4 is the process flow chart of the utility model kiln head.

Figure 5 is a schematic diagram of the combined flue gas intake design of the grate cooler.

Fig. 6 is a schematic diagram of the overall structure of the utility model.

detailed description:

See attached picture.

An online integrated system for recovery of waste heat from a cement kiln, including a firing system 5, a preheater system 1, a kiln tail waste heat boiler 3, a high-temperature fan 4, a grate cooler 6, a kiln head waste heat boiler 7, and a bag dust collector 9 , part of the high-temperature flue gas produced by the firing system 5 enters the preheater system 1 through the kiln tail, then enters the waste heat boiler 3 at the kiln tail, and finally is sent to the waste gas system at the kiln tail through the high-temperature fan 4, and the other part passes through the kiln head The grate cooler 6 at the position works to pass the high-temperature flue gas into the kiln head waste heat boiler 7 through the flue gas pipe, and the high-temperature flue gas passes through the kiln head waste heat boiler 7 and then enters the bag filter 9, and passes through the kiln head waste heat boiler 7. Fan 10 and chimney 11 discharge.

The grate cooler 6 is respectively provided with three air intakes, wherein one air intake 01 is located at the front of the grate cooler, the other air intake 02 is located at the middle of the grate cooler, and the third air intake 03 is located at the rear of the grate cooler 6 , the inlet air temperature entering the waste heat boiler at the kiln head can be controlled through the flue air valve group on the air pipe.

Claims (2)

1. a kind of online integral system of cement kiln waste heat recovery, include firing system, pre-heating system, kiln tail waste heat pot Stove, high-temperature blower, grate-cooler, kiln hood waste heat pot, bag collector, the high-temperature flue gas part that the firing system is burnt till is through kiln tail Portion is entered in pre-heating system, subsequently into kiln tail waste heat boiler, is most sent to kiln tail gas system through high-temperature blower afterwards, another Part is worked by the grate-cooler of kiln hood position and is passed into high-temperature flue gas in kiln hood waste heat boiler by flue, its high temperature Flue gas is passed through bag filter again after kiln hood waste heat boiler, is discharged through kiln head exhaust fan and chimney.

2. the online integral system of cement kiln waste heat recovery according to claim 1, it is characterised in that：Described grate-cooler Upper setting three respectively takes air port, and one of them takes air port to be located at grate-cooler front portion, and another takes air port to be located in the middle part of grate-cooler, 3rd takes air port to be located at cooling drive end unit, is controllable entering into kiln hood waste heat boiler by the cigarette air valve group on airduct Air temperature.