CN206695111U - Low capacity boiler reheated steam multitube bypasses thermoregulating system - Google Patents

Abstract

The utility model discloses a kind of low capacity boiler reheated steam multitube to bypass thermoregulating system, including low-temperature reheater, high temperature reheater, direct-contact desuperheater, low-temperature reheater steam by-pass pipe, electric gate valve, mixing header, Desuperheating water regulating valve, emergency spray attemperator, low-temperature reheater import header, low-temperature reheater outlet header, high temperature reheater import header, high temperature reheater outlet header.The utility model bypasses thermoregulating system by low capacity boiler reheated steam multitube, efficiently solves the problem of regulation of low capacity boiler reheated steam is difficult, has the advantages that simple system, bypass pipe resistance are small, easily operated, temperature adjusting performance is reliable.

Description

Low capacity boiler reheated steam multitube bypasses thermoregulating system

Technical field

The utility model belongs to boiler plant field, and in particular to a kind of low capacity boiler reheated steam multitube bypasses temperature adjustment System, the reheat steam temperature for low capacity boiler are adjusted.

Background technology

With environmental protection and the continuous improvement of energy-saving and emission-reduction requirement, low capacity boiler high parameterization band reheat system will be future One trend of boiler industry development, such as there is producer to surpass with 220t/h, 130t/h, 110t/h HTHP and high temperature Reheating steam system is used in the small-capacity generator group of high-pressure boiler, but is limited by various factors such as production run, technologies, The fluctuation of low capacity boiler load is big, working conditions change is frequent, therefore reliable reheat steam temperature regulating system is to ensure whole machine The essential condition of group normal table work.

Under declared working condition, in order to ensure reheated steam quality, reheater water injection desuperheater spray amount is steamed no more than reheating The 2% of steam flow amount, only steam side temperature adjustment can not meet the needs of reheat steam temperature regulation；Steamed to more effectively regulate and control reheating Stripping temperature, boiler for high power station typically adjusts reheat steam temperature using the method for flue gas bypass, but low capacity boiler is restricted In exhaust gas volumn is small, flue gas flow deviation is big, flue gas flow area is limited etc., factor is influenceed, and cigarette is easily produced using flue gas by-pass method Gas bias current, very big thermal deviation can be produced, be difficult to control, fume side thermoregulation effect is undesirable.Therefore, how effectively reliably to enter The regulation of row reheat steam temperature turns into an important factor for small-load generators development restricted with reheat system.

The content of the invention

The purpose of this utility model is to adjust in view of the above-mentioned problems, providing a kind of low capacity boiler reheated steam multitube bypass Warm system, realize the reliable adjustment to low capacity boiler reheat steam temperature, can effectively solve the fluctuation of low capacity boiler load it is big, Regulation frequently, using the bias current of fume side temperature adjustment means it is serious, whard to control the problem of.

The utility model is achieved like this, low capacity boiler reheated steam multitube bypass thermoregulating system, mainly includes Low-temperature reheater, high temperature reheater, reheater water injection attemperator, low-temperature reheater steam by-pass pipe, electric gate valve, mixing collection Case, Desuperheating water regulating valve, emergency spray attemperator, low-temperature reheater import header, low-temperature reheater outlet header, high temperature reheating Device import header and high temperature reheater outlet header；It is characterized in that：The emergency spray attemperator being connected with steam turbine passes through pipeline It is respectively connecting to low-temperature reheater import header and more than the three low-temperature reheater steam by-pass pipes being connected in parallel, cold reheat Device import header connects up low-temperature reheater, and low-temperature reheater connects up low-temperature reheater outlet header, low-temperature reheater Outlet header is connected to reheater water injection attemperator by pipeline, and reheater water injection attemperator is connected to high temperature by mixing header Reheater import header, high temperature reheater import header connect up high temperature reheater, the high temperature connected above high temperature reheater Reheater outlet header is connected to steam turbine by pipeline；The other end of every low-temperature reheater steam by-pass pipe is connected directly to Mixing header, electric gate valve is housed on every low-temperature reheater steam by-pass pipe；Desuperheating water passes through equipped with Desuperheating water regulating valve Water pipe is respectively connecting to emergency spray attemperator and reheater water injection attemperator.

The reheated steam extracted out from steam turbine cylinder, two-way is divided into after emergency spray attemperator, introduces reheater all the way Import header, another way pass through low-temperature reheater steam by-pass pipe, the mixing header introduced behind direct-contact desuperheater；Major part is again Vapours enters low-temperature reheater import header, and after low-temperature reheater heats, reheating is introduced by low-temperature reheater outlet header Device direct-contact desuperheater, the steam after spray cooling flow into mixing header；Remaining sub-fraction reheated steam is through emergency spray After attemperator, mixing header is introduced directly into by low-temperature reheater steam by-pass pipe, the part height with flowing through low-temperature reheater Warm steam is sufficiently mixed, and is reduced the reheat steam temperature of high temperature reheater entrance, is prevented high temperature reheater outlet steam temperature from surpassing Go out；Reheated steam after the blended further desuperheat of header, heat, reach into high temperature reheater through high temperature reheater import header To after nominal steam temperature, turbine low pressure cylinder acting is introduced through main-steam outlet valve by outlet header；The low-temperature reheater Steam by-pass pipe just, pass-out steam flow is adjusted by the quantity of open and close electric gate valve according to reheated steam outlet temperature, Realize the regulation to reheat steam temperature；It is described that the main method for regulating temperature that temperature adjustment is reheated steam, spray are bypassed by reheated steam Water temperature reducing regulation is only auxiliary adjustment, during boiler operatiopn, after reject steam desuperheat, is become according to reheater main-steam outlet temperature Change, the injection flow rate of direct-contact desuperheater is controlled by Desuperheating water regulating valve, carry out micro auxiliary adjustment, system is only carried out in steam side Temperature is adjusted, it is not necessary to sets adjusting means again in fume side；The emergency spray attemperator only breaks down in steam turbine, reheating Inlet steam temperature uses when exceeding design load.

Further, above-mentioned low capacity boiler reheated steam multitube bypass thermoregulating system, the mixing header is using set Tubular construction, avoid cold fluid and hot fluid from directly contacting header body, produce heat fatigue and damage；The low capacity boiler reheated steam Multitube bypasses thermoregulating system, illustrate only the main building block and adjusting means of system, should also include composition system pipeline, Measurement apparatus and other necessary valves.

Further, above-mentioned low capacity boiler reheated steam multitube bypass thermoregulating system, in order to preferably control bypass The flow of steam, the caliber of described low-temperature reheater steam by-pass pipe is different, full by the combination of different tube diameters pipeline Sufficient boiler adjusts the demand of reheat steam temperature under different operating modes.

Steam side method for regulating temperature using steam by-pass combination spray desuperheating is that solve small-load generators reheat steam temperature The effective way of reliable adjustment.Reheat system drag overall loss is smaller, typically requires that boiler body reheater SR is little In 0.15MPa, the regulation to steam flow on bypass line causes larger difficulty, and regulating valve resistance cannot act as greatly very much bypassing The regulation of steam flow, triple valve resistance is smaller, still can not meet to require, and triple valve it is expensive be unfavorable for product into This control.Bypass line adjusts steam flow using the folding of multi-pipeline gate valve, and resistance is small, cheap, meets systematic function Requirement, can be realized with reference to spray desuperheating and reheat steam temperature is continuously adjusted.

It is of the present utility model to have the technical effect that：Thermoregulating system is bypassed by low capacity boiler reheated steam multitube, effectively Solve the problems, such as that the regulation of low capacity boiler reheated steam is difficult, there is that simple system, bypass pipe resistance be small, easily operated, temperature adjustment The advantages that dependable performance.

Brief description of the drawings

Fig. 1 is system structure diagram of the present utility model.

In figure：1. low-temperature reheater, 2. high temperature reheaters, 3. reheater water injection attemperators, 4. low-temperature reheater steam Bypass pipe, 5. electric gate valves, 6. mixing headers, 7. Desuperheating water regulating valves, 8. emergency spray attemperators, 9. low-temperature reheater imports Header, 10. low-temperature reheater outlet headers, 11. high temperature reheater import headers, 12. high temperature reheater outlet headers.

Embodiment

As shown in figure 1, its bag low-temperature reheater 1, high temperature reheater 2, reheater water injection attemperator 3, low-temperature reheater steam Vapour bypass pipe 4, electric gate valve 5, mixing header 6, Desuperheating water regulating valve 7, emergency spray attemperator 8, low-temperature reheater inlet header Case 9, low-temperature reheater outlet header 10, high temperature reheater import header 11, high temperature reheater outlet header 12.It is connected with steam turbine Emergency spray attemperator 8 low-temperature reheater import header 9 is respectively connecting to by pipeline and more than three be connected in parallel it is low Warm reheater steam by-pass pipe 4, low-temperature reheater import header 9 connect up low-temperature reheater 1, and low-temperature reheater 1 connects upwards Low-temperature reheater outlet header 10 is connect, low-temperature reheater outlet header 10 is connected to reheater water injection attemperator 3 by pipeline, then Hot device direct-contact desuperheater 3 is connected to high temperature reheater import header 11 by mixing header 6, high temperature reheater import header 11 to Upper connection high temperature reheater 2, the high temperature reheater outlet header 12 of the top of high temperature reheater 2 connection are connected to vapour by pipeline Machine；The other end of every low-temperature reheater steam by-pass pipe 4 is connected directly to mixing header 6, every low-temperature reheater steam Electric gate valve 5 is housed on bypass pipe 4；Desuperheating water is respectively connecting to emergency spray by the water pipe equipped with Desuperheating water regulating valve 7 and subtracted Warm device 8 and reheater water injection attemperator 3.

The reheated steam extracted out from steam turbine cylinder, is divided into two-way, most of reheated steam after emergency spray attemperator By low-temperature reheater import header, after low-temperature reheater heats, direct-contact desuperheater is introduced by low-temperature reheater outlet header, Steam after spray cooling flows into mixing header；Another part reheated steam is after emergency spray attemperator, through cold reheat Device steam by-pass pipe is introduced directly into mixing header, and the high-temperature steam to come with direct-contact desuperheater is sufficiently mixed, reheat steam temperature After further reducing, heated through high temperature reheater import header into high temperature reheater, after reaching nominal steam temperature, by exporting Header introduces turbine low pressure cylinder acting through main-steam outlet valve.Emergency spray attemperator only breaks down in steam turbine, reheating Inlet steam temperature uses when exceeding design load.

Claims (3)

1. low capacity boiler reheated steam multitube bypasses thermoregulating system, mainly including low-temperature reheater, high temperature reheater, reheater Direct-contact desuperheater, low-temperature reheater steam by-pass pipe, electric gate valve, mixing header, Desuperheating water regulating valve, emergency spray desuperheat Device, low-temperature reheater import header, low-temperature reheater outlet header, high temperature reheater import header and high temperature reheater outlet collection Case；It is characterized in that：The emergency spray attemperator being connected with steam turbine is respectively connecting to low-temperature reheater import header by pipeline With more than three low-temperature reheater being connected in parallel steam by-pass pipes, low-temperature reheater import header connects up cold reheat Device, low-temperature reheater connect up low-temperature reheater outlet header, and low-temperature reheater outlet header is connected to reheating by pipeline Device direct-contact desuperheater, reheater water injection attemperator are connected to high temperature reheater import header, high temperature reheater by mixing header Import header connects up high temperature reheater, and the high temperature reheater outlet header connected above high temperature reheater is connected by pipeline To steam turbine；The other end of every low-temperature reheater steam by-pass pipe is connected directly to mixing header, and every low-temperature reheater steams Electric gate valve is housed on vapour bypass pipe；Desuperheating water is respectively connecting to emergency spray desuperheat by the water pipe equipped with Desuperheating water regulating valve Device and reheater water injection attemperator.

2. low capacity boiler reheated steam multitube according to claim 1 bypasses thermoregulating system, it is characterised in that：It is described mixed Intersection case uses sleeve structure.

3. low capacity boiler reheated steam multitube according to claim 1 bypasses thermoregulating system, it is characterised in that：Described The caliber of low-temperature reheater steam by-pass pipe is different.